JP4238543B2 - Internal combustion engine equipped with a heat storage device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an internal combustion engine mounted on an automobile or the like, and more particularly to an internal combustion engine including a heat storage device capable of storing a heat medium such as cooling water in a heat storage state.
[0002]
[Prior art]
In recent years, an internal combustion engine equipped with a heat storage device has been proposed in an internal combustion engine mounted on an automobile or the like for the purpose of improving cold startability, combustion stability, exhaust emission, or indoor heating performance.
[0003]
As an internal combustion engine provided with such a heat storage device, for example, there is an internal combustion engine as described in JP-A-2002-4855. An internal combustion engine having a heat storage device described in this publication includes an internal combustion engine body that is cooled or heated by circulation of a heat medium, and a heater core that exchanges heat between the heat medium and air for heating a vehicle interior. A heat medium circulation circuit that circulates a heat medium via the internal combustion engine body and the heater core, a bypass passage connected to the heat medium circulation circuit to bypass the heater core, and provided in the bypass passage, A heat storage container that stores heat of the medium; and a pump mechanism that is provided in the bypass passage and pressure-feeds the heat medium in the bypass passage.
[0004]
In the internal combustion engine provided with the heat storage device as described above, the heat storage container and the pump mechanism are positioned in parallel with the heater core in the flow direction of the heat medium, and therefore, the internal combustion engine, the heater core, the heat storage container, and the pump mechanism. It is possible to selectively establish a circulation circuit that passes through all, a circulation circuit that passes only through the internal combustion engine, the heat storage container, and the pump mechanism, and a circulation circuit that passes through only the internal combustion engine and the heater core.
[0005]
Therefore, by circulating a high-temperature heat medium to a desired circulation circuit and selectively transferring the amount of heat of the heat medium to the internal combustion engine or the heater core, the performance of the internal combustion engine for efficient preheating and interior heating is improved. Can be realized.
[0006]
Moreover, as an internal combustion engine provided with the above heat storage apparatuses, there exists a warm-up control apparatus described in Unexamined-Japanese-Patent No. 2002-89668, for example. The warm-up control device disclosed in this publication includes a heat storage tank in a cooling water system of an internal combustion engine, retains high temperature cooling water in the heat storage tank, and stores the cooling water stored in the heat storage tank with the internal combustion engine. In a warm-up control device that warms up by supplying to a transmission, the ratio of the amount of cooling water supplied from the heat storage tank to the internal combustion engine and the transmission is determined according to the temperature of the internal combustion engine and the transmission. It is configured to set.
[0007]
In the warm-up control device as described above, the above configuration makes it possible to perform an appropriate warm-up operation in accordance with the respective temperature states for the internal combustion engine and the transmission. Can be prevented.
[0008]
[Problems to be solved by the invention]
An internal combustion engine having the above-described heat storage device includes a first circulation circuit in which a heat medium circulates via the internal combustion engine, and a device other than the internal combustion engine such as a heater core and a transmission for vehicle compartment heating. And a second circulation circuit through which the heat medium circulates, and switches the heat medium circulation circuit in accordance with the state of the internal combustion engine or a device other than the internal combustion engine (for example, temperature).
[0009]
Conventionally, when the internal combustion engine is warmed up at or before the start of the internal combustion engine, a warm-up execution command for the internal combustion engine is received from a warm-up execution command means such as an ECU mounted on the vehicle, for example. The circulation circuit of the heat medium is switched by a circulation circuit switching means such as a flow path switching valve so that the high-temperature heat medium supplied from the heat storage container circulates through the first circulation circuit. The high-temperature heat medium circulates in the first circulation circuit, whereby the heat amount of the heat medium is transmitted to the internal combustion engine, and warming up of the internal combustion engine is achieved.
[0010]
However, in an internal combustion engine equipped with a conventional heat storage device, when warming up the internal combustion engine is executed, the warming-up execution command of the internal combustion engine is issued from a warm-up execution command means such as an ECU, and then the flow path It takes time (for example, about 5 seconds) until the circulation circuit of the heat medium is actually switched to the first circulation circuit by the circulation circuit switching means such as a switching valve. For this reason, after a warm-up execution command for the internal combustion engine is issued from a warm-up execution command means such as an ECU and the supply of the high-temperature heat medium from the heat storage container is started, the heat medium circulation circuit is completely first. Until switching to the circulation circuit, the high-temperature heat medium supplied from the heat storage container also flows to the second circulation circuit.
[0011]
Therefore, since a high-temperature heat medium is supplied to devices other than the internal combustion engine, the warm-up efficiency of the internal combustion engine is deteriorated.
[0012]
After the warm-up execution command is issued from the warm-up execution command means, the supply of the high-temperature heat medium from the heat storage container is started after the heat medium circulation circuit is completely switched to the first circulation circuit. When doing so, the time until the heat medium is actually supplied to the internal combustion engine becomes longer.
[0013]
Therefore, since the time until the warm-up of the internal combustion engine is achieved becomes longer, the warm-up efficiency of the internal combustion engine is also deteriorated.
[0014]
Also, in an internal combustion engine equipped with a heat storage device as described above, after warming up of the internal combustion engine, it is necessary to supply a high-temperature heat medium to devices other than the internal combustion engine, such as a heater core for vehicle compartment heating and a transmission Supplies a high-temperature heat medium supplied from the heat storage container to a device other than the internal combustion engine by switching the circulation circuit of the heat medium to a second circulation circuit through which the heat medium circulates via a device other than the internal combustion engine. . Furthermore, after supplying a high-temperature heat medium to a device other than the internal combustion engine, the internal combustion engine is stopped before a new high-temperature heat medium is recovered in the heat storage container, and then before the internal combustion engine is restarted or When the internal combustion engine is warmed up when the internal combustion engine is restarted, the internal combustion engine is supplied by supplying the high-temperature heat medium remaining in the heat storage container to the internal combustion engine after supplying the high-temperature heat medium to devices other than the internal combustion engine. The engine will be warmed up.
[0015]
Therefore, if an excessive amount of the heat medium is supplied when supplying the high-temperature heat medium stored in the heat storage container to a device other than the internal combustion engine, the internal combustion engine is warmed up before or during the restart. Therefore, the heat medium necessary to sufficiently perform the operation will be insufficient. As a result, the internal combustion engine cannot be reliably warmed up.
[0016]
The present invention has been made in view of the above circumstances, and in an internal combustion engine equipped with a heat storage device, the warm-up of the internal combustion engine is ensured without deteriorating the warm-up efficiency before or at the start of the internal combustion engine. It aims at providing the technology which can perform a machine.
[0017]
[Means for Solving the Problems]
The present invention employs the following means in order to solve the above problems.
That is, the internal combustion engine provided with the heat storage device according to the present invention is
A heat storage container for storing the heat medium in a heat storage state;
A first circulation circuit in which the heat medium circulates via an internal combustion engine;
A second circulation circuit in which the heat medium circulates via a device other than the internal combustion engine;
A warm-up execution means for performing warm-up of the internal combustion engine before or at the start of the internal combustion engine with a high-temperature heat medium stored in the heat storage container;
A warm-up execution command means for issuing an internal combustion engine warm-up execution command to the warm-up execution means to execute warm-up of the internal combustion engine;
Circulation circuit switching means for switching between the first circulation circuit and the second circulation circuit,
The first circulation circuit switching for switching the circulation circuit of the heat medium to the first circulation circuit by the circulation circuit switching means before the warm-up execution instruction is issued from the warm-up execution instruction means to the warm-up execution means. It was set as the structure which controls.
[0018]
According to this configuration, when the internal combustion engine is warmed up before or at the start of the internal combustion engine, the internal combustion engine is warmed up so that the warm-up execution command means performs the warm-up execution means to the warm-up execution means. Although the command is issued, the heat medium circulation circuit is switched to the first circulation circuit at a time before the warm-up execution command means issues the internal combustion engine warm-up execution command.
[0019]
Therefore, when the warm-up is executed by the warm-up execution means and the supply of the high-temperature heat medium from the heat storage container is started, the heat medium circulation circuit has already been switched to the first circulation circuit. Accordingly, it is possible to prevent a high-temperature heat medium from flowing into the second circulation circuit.
[0020]
That is, according to the above configuration, when the internal combustion engine is warmed up before or during startup of the internal combustion engine, a high-temperature heat medium is not supplied to devices other than the internal combustion engine. Moreover, since the high-temperature heat medium is supplied to the internal combustion engine immediately after the start of warming up of the internal combustion engine, the internal combustion engine is quickly warmed up. Therefore, the internal combustion engine can be warmed up without deteriorating the warming up efficiency.
[0021]
Here, in the present invention, the first circulation circuit switching control may be performed when the internal combustion engine is stopped.
[0022]
According to this configuration, since the heat medium circulation circuit is switched to the first circulation circuit when the internal combustion engine is stopped, the heat medium circulation circuit is already in the first state before the internal combustion engine is started next time. It is a circulation circuit.
[0023]
Therefore, when warming up the internal combustion engine before or during startup of the internal combustion engine, it is possible to prevent a high-temperature heat medium from being supplied to devices other than the internal combustion engine. Moreover, since the high-temperature heat medium is supplied to the internal combustion engine immediately after the start of warming up of the internal combustion engine, the internal combustion engine is quickly warmed up. Therefore, the internal combustion engine can be warmed up without deteriorating the warming up efficiency.
[0024]
Moreover, the internal combustion engine provided with the heat storage device according to the present invention,
A heat storage container for storing the heat medium in a heat storage state;
A first circulation circuit in which the heat medium circulates via an internal combustion engine;
A second circulation circuit in which the heat medium circulates via a device other than the internal combustion engine;
Heat medium heat capacity calculating means for calculating the heat capacity of the high temperature heat medium remaining in the heat storage container after warming up the internal combustion engine by circulating the high temperature heat medium stored in the heat storage container to the first circulation circuit When,
Circulation circuit switching means for switching between the first circulation circuit and the second circulation circuit,
The heat capacity of the high temperature heat medium remaining in the heat storage container after warming up the internal combustion engine calculated by the heat medium heat capacity calculation means is equal to or greater than a predetermined amount, and a device other than the internal combustion engine has a high temperature. When it is necessary to supply the heat medium, the second circulation circuit switching control for switching the circulation circuit to the second circulation circuit is performed by the circulation circuit switching means.
[0025]
According to this configuration, the heat capacity of the high-temperature heat medium remaining in the heat storage container after warming up the internal combustion engine is equal to or greater than a predetermined amount, and it is necessary to supply the high-temperature heat medium to devices other than the internal combustion engine. In some cases, the high-temperature heat medium remaining in the heat storage container is circulated through the second circulation circuit, that is, supplied to a device other than the internal combustion engine.
[0026]
In other words, when the heat capacity of the high-temperature heat medium remaining in the heat storage container is less than a predetermined amount, the high-temperature heat medium can be prevented from being supplied to devices other than the internal combustion engine.
[0027]
Here, the predetermined amount is required to warm up the internal combustion engine next time before the internal combustion engine is restarted or when the internal combustion engine is restarted next time or after the internal combustion engine is restarted. It is good also as a structure which is heat capacity.
[0028]
According to this configuration, the predetermined amount is a heat capacity of a high-temperature heat medium necessary for warming up the internal combustion engine after the internal combustion engine is temporarily stopped and before or when the internal combustion engine is restarted. is there. Therefore, when the heat capacity of the high-temperature heat medium remaining in the heat storage container after warming up the internal combustion engine is less than a predetermined amount, the heat medium is supplied to devices other than the internal combustion engine before restarting the internal combustion engine. Alternatively, it is possible to prevent a shortage of the heat medium necessary for warming up the internal combustion engine during restart.
[0029]
In other words, according to the above configuration, even when the internal combustion engine is temporarily stopped before a new high-temperature heat medium is recovered in the heat storage container, the internal combustion engine is restarted before or when the internal combustion engine is restarted next time. By ensuring a heat medium necessary for warming up the engine in the heat storage container, it is possible to reliably warm up the internal combustion engine.
[0030]
Further, the heat capacity of the heat medium required for warming up the internal combustion engine changes according to the temperature of the internal combustion engine before warming up. In other words, if the temperature of the internal combustion engine before warming up is high, the heat capacity of the heat medium required for warming up decreases, and if the temperature of the internal combustion engine before warming up is low, the heat capacity of the heat medium required for warming up Will be more.
[0031]
Therefore, in the present invention, the next required engine warm-up heat capacity may be determined by the temperature of the heat medium in the first circulation circuit.
[0032]
According to this configuration, in order to warm up the internal combustion engine before or during the restart of the internal combustion engine after the internal combustion engine is temporarily stopped by the temperature of the heat medium in the first circulation circuit passing through the internal combustion engine. The heat capacity of the required heat medium is determined. For this reason, it is possible to prevent an excessively or excessively high temperature heat medium from being secured against the warm-up of the internal combustion engine.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of an internal combustion engine including a heat storage device according to the present invention will be described with reference to the drawings.
[0034]
<First Embodiment>
FIG. 1 is a view showing a cooling water circulation system of an internal combustion engine equipped with a heat storage device according to the present invention.
[0035]
The internal combustion engine 1 is a compression ignition internal combustion engine (diesel engine) using light oil as a fuel or a spark ignition internal combustion engine (gasoline engine) using gasoline as a fuel, and is an engine mounted on an automobile.
[0036]
The internal combustion engine 1 includes a cylinder head 1a and a cylinder block 1b. Each of the cylinder head 1a and the cylinder block 1b is formed with a head side cooling water channel 2a and a block side cooling water channel 2b for circulating cooling water as a heat medium according to the present invention. The block side cooling water channel 2b communicates with each other.
[0037]
A first cooling water channel 4 is connected to the head side cooling water channel 2 a, and the first cooling water channel 4 is connected to a cooling water inlet of the radiator 5. A cooling water outlet of the radiator 5 is connected to a thermostat valve 7 via a second cooling water channel 6.
[0038]
In addition to the second cooling water channel 6, a third cooling water channel 8 and a bypass water channel 9 are connected to the thermostat valve 7. The third cooling water channel 8 is connected to a suction port of a mechanical water pump 10 using a rotational torque of an engine output shaft (crankshaft) of the internal combustion engine 1 as a driving source, and the bypass water channel 9 is connected to the head side cooling water channel 2a. It is connected to the.
[0039]
The block-side cooling water channel 2b is connected to the discharge port of the mechanical water pump 10 described above.
[0040]
The thermostat valve 7 described above is a flow path switching valve that blocks either the second cooling water path 6 or the bypass water path 9 according to the temperature of the cooling water. Specifically, the thermostat valve 7 shuts off the second cooling water passage 6 when the temperature of the cooling water flowing through the thermostat valve 7 is lower than a predetermined valve opening temperature: Temp1 (for example, 80 ° C. to 90 ° C.). At the same time, the bypass water channel 9 is opened, and the third cooling water channel 8 and the bypass water channel 9 are made conductive. When the temperature of the cooling water flowing through the thermostat valve 7 is equal to or higher than the valve opening temperature: Temp1, the thermostat valve 7 opens the second cooling water channel 6 and simultaneously shuts off the bypass water channel 9 to provide a third cooling water channel. 8 and the second cooling water channel 6 are made conductive.
[0041]
Next, a heater hose 11 is connected in the middle of the first cooling water channel 4, and the heater hose 11 is connected in the middle of the third cooling water channel 8. In the middle of the heater hose 11, a heater core 12 for exchanging heat between the cooling water and the air for indoor heating is disposed.
[0042]
A first bypass passage 13 a is connected to a portion of the heater hose 11 located between the heater core 12 and the third cooling water passage 8, and the first bypass passage 13 a is connected to a cooling water suction port of the electric water pump 14. Yes. Subsequently, the cooling water discharge port of the electric water pump 14 is connected to the cooling water inlet 15a of the heat storage container 15 through the second bypass passage 13b. Furthermore, the cooling water outlet 15b of the heat storage container 15 is connected to the heater hose 11 located between the heater core 12 and the first cooling water passage 4 via the third bypass passage 13c.
[0043]
The heat storage container 15 is a container that stores the cooling water while storing the heat of the cooling water. When new cooling water flows from the cooling water inlet 15a, the heat storage container 15 is stored in the heat storage container 15 in place of the cooling water. The cooling water is discharged from the cooling water outlet 15b. A one-way valve for preventing the backflow of cooling water is attached to each of the cooling water inlet 15a and the cooling water outlet 15b of the heat storage container 15.
[0044]
The electric water pump 14 is a water pump that uses the output power of the battery 43 as a driving source, and is configured to discharge the cooling water sucked from the cooling water suction port from the cooling water discharge port.
[0045]
Here, in the heater hose 11 located between the heater core 12 and the first cooling water passage 4, a portion on the first cooling water passage 4 side is referred to as a first heater hose 11a with reference to a connection portion of the third bypass passage 13c. A portion on the heater core 12 side is referred to as a second heater hose 11b. Further, in the heater hose 11 located between the heater core 12 and the third cooling water passage 8, the portion on the heater core 12 side with reference to the connection portion of the first bypass passage 13a is referred to as a third heater hose 11c, and the third A portion on the cooling water channel 8 side is referred to as a fourth heater hose 11d.
[0046]
Next, a warmer hose 19 is further connected to a connection portion between the heater hose 11 and the third bypass passage 13c, and the warmer hose 19 is connected in the middle of the third heater hose 11c. In the middle of the warmer hose 19, an ATF warmer 20 that performs heat exchange between cooling water and transmission oil (ATF: Autmatic Transmission Fluid) is disposed.
[0047]
Here, in the warmer hose 19, a portion between the connection portion of the heater hose 11 and the third bypass passage 13c and the ATF warmer 20 is referred to as a first warmer hose 19a. A portion between the three heater hose 11c and the connection portion is referred to as a second warmer hose 19b.
[0048]
A flow path switching valve 16 is provided at a connection portion between the first heater hose 11a, the second heater hose 11b, the third bypass passage 13c, and the first warmer hose 19a. The flow path switching valve 16 is configured to selectively block any one or more of the four paths, and is driven by an actuator such as a step motor.
[0049]
A first water temperature sensor 17 that outputs an electrical signal corresponding to the temperature of the cooling water flowing in the third bypass passage 13c is attached to the vicinity of the communication portion of the third bypass passage 13c with the heat storage container 15. Further, a second water temperature sensor 18 that outputs an electric signal corresponding to the temperature of the cooling water flowing in the head side cooling water channel 2a is attached in the vicinity of the connection portion of the head side cooling water channel 2a with the first cooling water channel 4. Yes.
[0050]
The thus configured cooling water circulation system is provided with an electronic control unit (ECU: Electronic Control Unit) 39 for controlling the operating state of the cooling water circulation system. The ECU 39 is an arithmetic logic operation circuit including a CPU, a ROM, a RAM, a backup RAM, an input port, an output port, an A / D converter, and the like. The ECU 39 may be provided independently of the ECU for controlling the operating state of the internal combustion engine 1 or may be used in combination.
[0051]
In addition to the first water temperature sensor 17, the second water temperature sensor 18, and the battery 43, the ECU 39 includes an ignition switch 40, a starter switch 41, and a switch (heater switch) 42 for the indoor heating device. Are electrically connected, and the output signals of these various sensors are input to the ECU 39.
[0052]
Further, the ECU 39 is electrically connected to the electric water pump 14 and the flow path switching valve 16 described above, and the ECU 39 can control the electric water pump 14 and the flow path switching valve 16.
[0053]
Specifically, the ECU 39 operates in accordance with an application program stored in the ROM, and executes circulation circuit switching control for switching the cooling water circulation circuit in the cooling water circulation system.
[0054]
Next, the circulation of the cooling water when the internal combustion engine 1 is warmed up before starting in the present embodiment will be described.
[0055]
FIG. 2 is a diagram showing the circulation of cooling water when the internal combustion engine 1 is warmed up before starting in the present embodiment.
[0056]
The ECU 39 circulates according to the present invention to shut off the second heater hose 11b and the first warmer hose 19a corresponding to the second circulation circuit according to the present invention before executing the warm-up before starting the internal combustion engine 1. The flow path switching valve 16 corresponding to the circuit switching means is controlled (corresponding to the first circulation circuit switching control according to the present invention).
[0057]
Thereafter, before the internal combustion engine 1 is started (before cranking of the internal combustion engine 1 is started), the ECU 39 issues an internal combustion engine warm-up execution command according to the present invention and from the battery 43 to operate the electric water pump 14. The power supply to the electric water pump 14 is allowed.
[0058]
Here, the ECU 39 corresponds to the warm-up execution command unit according to the present invention, and the battery 43 and the electric water pump 14 correspond to the warm-up execution unit according to the present invention.
[0059]
In this case, the first heater hose 11a and the third bypass passage 13c communicate with each other, and only the electric water pump 14 operates without the mechanical water pump 10 operating.
[0060]
Therefore, as shown in FIG. 2, the electric water pump 14, the second bypass passage 13b, the heat storage container 15, the third bypass passage 13c, the flow switching valve 16, the first heater hose 11a, the first cooling water passage 4, and the head side. Internal combustion engine circulation circuit 31 (in which cooling water flows in the order of cooling water passage 2a → block side cooling water passage 2b → mechanical water pump 10 → third cooling water passage 8 → fourth heater hose 11d → first bypass passage 13a → electric water pump 14) This corresponds to the first circulation circuit according to the present invention.
[0061]
When the internal combustion engine circulation circuit 31 is established, high-temperature cooling water (hereinafter referred to as hot water) stored in the heat storage container 15 is discharged from the cooling water outlet 15b, and the third bypass passage 13c and the flow path switching valve 16 are discharged. Then, the air flows into the head side cooling water passage 2 a of the internal combustion engine 1 through the first heater hose 11 a and the first cooling water passage 4.
[0062]
The hot water that has flowed into the head-side cooling water passage 2a then flows into the block-side cooling water passage 2b, and the cylinder head 1a and the cylinder block 1b are heated by the hot water that has flowed in, so that the internal combustion engine 1 is warmed up.
[0063]
Here, the time when the ECU 39 allows the power supply from the battery 43 to the electric water pump 14, that is, the time when the ECU 39 issues the internal combustion engine warm-up execution command according to the present invention is, for example, (1) the door of the vehicle When it is opened and the door switch (not shown) is turned on, (2) When the driver is seated on the seat in the passenger compartment and the seating sensor (not shown) in the seat sends an ON signal, (3) For example, when the anti-theft device turned on when the vehicle is stopped is turned off to start the vehicle.
[0064]
Further, for example, when the driver is seated on the seat in (2) above and a seating sensor (not shown) in the seat sends an ON signal, the ECU 39 supplies power from the battery 43 to the electric water pump 14. When the cooling water circulation circuit is switched to the internal combustion engine circulation circuit 31 side by controlling the flow path switching valve 16, that is, when the first circulation circuit switching control according to the present invention is performed, For example, when the door of the vehicle is opened and a door switch (not shown) is turned ON.
[0065]
Further, the internal combustion engine 1 is stopped at the time when the cooling water circulation circuit is switched to the internal combustion engine circulation circuit 31 side by controlling the flow path switching valve 16, that is, when the first circulation circuit switching control according to the present invention is performed. It is also good when it is. In this case, at the time when the internal combustion engine 1 is warmed up before starting, the circulating circuit of the cooling water is switched to the internal combustion engine circuit 31 side.
[0066]
According to the present embodiment, before the ECU 39 allows the power supply from the battery 43 to the electric water pump 14, that is, before the ECU 39 issues the internal combustion engine warm-up execution command according to the present invention, the flow path switching valve 16 As a result, the second heater hose 11b and the first warmer hose 19a are shut off, the first heater hose 11a and the third bypass passage 13c communicate with each other, and the circulation circuit of the cooling water is switched to the internal combustion engine circulation circuit 31 side. Therefore, after the electric water pump 14 is actuated, it is possible to prevent warm water flowing out from the heat storage container 15 from flowing into the second heater hose 11b and the first warmer hose 19a.
[0067]
Next, the circulation circuit switching control in the case where the cooling water circulation circuit is switched to the internal combustion engine circulation circuit 31 side when the internal combustion engine 1 is stopped in the present embodiment will be specifically described with reference to FIG.
FIG. 3 is a flowchart showing a cooling water circulation circuit switching control routine when the internal combustion engine is stopped in the present embodiment.
[0068]
First, in S101, the ECU 39 determines whether or not the ignition switch 40 is turned off.
[0069]
If it is determined in S101 that the ignition switch 40 is not OFF, the ECU 39 once ends the execution of this routine.
[0070]
If it is determined in S101 that the ignition switch 40 has been turned off, the ECU 39 proceeds to S102 and issues a stop command for the internal combustion engine 1.
[0071]
Next, the ECU 39 proceeds to S103 and controls the flow path switching valve 16 to cut off the second heater hose 11b and the first warmer hose 19a and to connect the first heater hose 11a and the third bypass passage 13c. (That is, the first circulation circuit switching control according to the present invention is performed).
[0072]
In S103, the second heater hose 11b and the first warmer hose 19a are disconnected, and the first heater hose 11a and the third bypass passage 13c are communicated. Then, in S104, the ECU 39 stops and the execution of this routine is finished. To do.
[0073]
The ECU 39 stopped in S104 of this routine is restarted next time the internal combustion engine 1 is warmed up. For example, the ECU 39 may be activated at the times {circle around (1)}, {circle around (2)}, {circle around (3)} described above. In this case, the ECU 39 issues an internal combustion engine warm-up execution command according to the present invention after being activated.
[0074]
By executing this routine, when the internal combustion engine 1 is stopped, the second heater hose 11b and the first warmer hose 19a are shut off, and the first heater hose 11a and the third bypass passage 13c are communicated. That is, the cooling water circulation circuit is switched to the internal combustion engine circulation circuit 31 side.
[0075]
Therefore, at the next time when the internal combustion engine 1 is warmed up before the internal combustion engine 1 is started (when the internal combustion engine warm-up execution command according to the present invention is issued from the ECU 39), the cooling water circulation circuit does not circulate the internal combustion engine. Since it is on the circuit 31 side, the warm water flowing out from the heat storage container 15 to the circulation circuit after the start of warming-up of the internal combustion engine 1 does not flow out to the second heater hose 11b and the first warmer hose 19a.
[0076]
In addition, the warm water stored in the heat storage container 15 is supplied to the internal combustion engine 1 immediately after the start of warming up of the internal combustion engine 1.
[0077]
In the present embodiment, the first circulation circuit switching control is performed before the internal combustion engine 1 is warmed up before starting. However, the internal combustion engine 1 is not warmed up before starting, and the internal combustion engine 1 is started. Similarly, when the internal combustion engine 1 is sometimes warmed up, the first circulation circuit switching control is performed before the ECU 39 issues the internal combustion engine warm-up execution command according to the present invention.
[0078]
When the internal combustion engine 1 is warmed up when the internal combustion engine 1 is started, a start command for the internal combustion engine 1 is issued from the ECU 39, and the mechanical water pump 10 is activated when the internal combustion engine 1 is started. When the mechanical water pump 10 is operated, hot water is circulated through the internal combustion engine circulation circuit 31 and the internal combustion engine 1 is warmed up. At this time, the first circulation circuit switching control is performed before a start command for the internal combustion engine 1 is issued from the ECU 39 (for example, when the internal combustion engine 1 is stopped).
[0079]
<Second Embodiment>
Next, a second embodiment of the internal combustion engine provided with the heat storage device according to the present invention will be described based on the drawings.
[0080]
The configuration of the internal combustion engine provided with the heat storage device in the present embodiment is the same as that shown in FIG.
[0081]
In the present embodiment, the amount of warm water remaining in the heat storage container 15 after the warm-up before starting the internal combustion engine 1 is equal to or greater than a predetermined value, and if necessary, internal combustion engines such as the heater core 12 and the ATF warmer 20 The hot water remaining in the heat storage container 15 is supplied to devices other than the engine 1.
[0082]
FIG. 4 is a diagram showing a circulating circuit of cooling water when hot water is supplied to the heater core 12 in the present embodiment. FIG. 5 is a diagram showing a cooling water circulation circuit when hot water is supplied to the ATF warmer 20.
[0083]
When the amount of warm water remaining in the heat storage container 15 after the warm-up before starting the internal combustion engine 1 is equal to or greater than a predetermined value and the warm water needs to be supplied to the heater core 12, the ECU 39 sets the first heater hose 11a. And the first warmer hose 19a are shut off, and the flow path switching valve 16 corresponding to the circulation circuit switching means according to the present invention is controlled so that the second heater hose 11b and the third bypass passage 13c communicate with each other (the present invention). Corresponding to the second circulation circuit switching control).
[0084]
Thereafter, the ECU 39 activates the electric water pump 14, whereby the electric water pump 14 → the second bypass passage 13b → the heat storage container 15 → the third bypass passage 13c → the flow path switching valve 16 → second as shown in FIG. A heater core circulation circuit 32 (corresponding to the second circulation circuit according to the present invention) in which cooling water flows is formed in the order of heater hose 11b → heater core 12 → third heater hose 11c → first bypass passage 13a → electric water pump 14.
[0085]
When the heater circulation circuit 32 is established, hot water stored in the heat storage container 15 is supplied to the heater core 12.
[0086]
In addition, when the amount of warm water remaining in the heat storage container 15 is equal to or greater than a predetermined value after the warming-up before starting the internal combustion engine 1 and the warm water needs to be supplied to the ATF warmer 20, the ECU 39 The flow path switching valve 16 corresponding to the circulation circuit switching means according to the present invention is controlled so that the first heater hose 11a and the second heater hose 11b are shut off and the first warmer hose 19a and the third bypass passage 13c are communicated. (Corresponding to the second circulation circuit switching control according to the present invention).
[0087]
Thereafter, when the electric water pump 16 is operated by the ECU 39, as shown in FIG. 5, the electric water pump 14 → the second bypass passage 13b → the heat storage container 15 → the third bypass passage 13c → the flow path switching valve 16 → first. ATF warmer circulation circuit 33 (second circulation circuit according to the present invention) in which cooling water flows in the order of warmer hose 19a → ATF warmer 20 → second warmer hose 19b → third heater hose 11c → first bypass passage 13a → electric water pump 14 Is equivalent).
[0088]
When the ATF warmer circulation circuit 33 is established, the hot water stored in the heat storage container 15 is supplied to the ATF warmer 20.
[0089]
Next, in the present embodiment, the warm water supply control in the case where warm water is supplied to devices other than the internal combustion engine 1 such as the heater core 12 and / or the ATF warmer 20 after the warm-up before starting of the internal combustion engine 1 is completed is shown in FIG. This will be described in detail.
FIG. 9 shows a warm water supply control routine for supplying hot water to devices other than the internal combustion engine 1 such as the heater core 12 and / or the ATF warmer 20 after the start-up of the internal combustion engine 1 is completed in the present embodiment. FIG.
[0090]
First, in S201, the ECU 39 determines whether the warm-up before starting of the internal combustion engine 1 has been completed. For example, if the power supply from the battery 43 to the electric water pump 14 that is operating when the internal combustion engine 1 is warmed up before starting is stopped, the ECU 39 determines that the warming up before the internal combustion engine 1 is started is completed. .
[0091]
If it is determined in S201 that the warm-up before starting of the internal combustion engine 1 has not been completed, the ECU 39 once terminates the execution of this routine.
[0092]
If it is determined in S201 that the warm-up before starting of the internal combustion engine 1 has been completed, the ECU 39 proceeds to S202, and warm water supplied from the heat storage container 15 to the internal combustion engine 1 during the warm-up of the internal combustion engine 1 is started. The warm water supply amount Vph at the time of warming up before starting, which is the amount, is calculated.
[0093]
Since the viscosity of the cooling water changes depending on the temperature, as shown in FIG. Warm water supply amount Vph before start-up, which is the amount of hot water supplied from the heat storage container 15 to the internal combustion engine 1 during warm-up before start-up of the engine 1, increases.
[0094]
In the ROM of the ECU 39 and the like, as shown in FIG. 6, the warm-up water supply amount Vph before start-up and the internal-combustion-engine water temperature Tef before start-up of the internal combustion engine 1 detected by the second water temperature sensor 18, And the warm-up time before starting of the internal combustion engine 1, that is, the operation time tpp of the electric water pump 14, is recorded in advance as a three-dimensional map.
[0095]
In S202, the ECU 39 calculates the warm-up water supply amount Vph before start-up based on the three-dimensional map.
[0096]
Next, the ECU 39 proceeds to S203 and subtracts the pre-start warm-up hot water supply amount Vph calculated in S202 from the capacity V0 of the heat storage container 15 to store the heat storage that is the amount of hot water remaining in the heat storage container 15. The amount of remaining hot water in the container Vref is calculated.
Here, the ECU 39 corresponds to the heat medium heat capacity calculating means according to the present invention.
[0097]
After calculating the remaining hot water amount Vref in the heat storage container in S203, the ECU 39 proceeds to S204 and uses the amount of hot water required for warming up the internal combustion engine 1 before starting the next time the internal combustion engine 1 is started. A warm water supply amount Vres before warming up next time (equivalent to the heat capacity required for the next engine warming-up according to the present invention) is calculated.
[0098]
Depending on the temperature of the internal combustion engine 1 and the temperature of the hot water stored in the heat storage container 15, the amount of hot water required for warming up the internal combustion engine 1 before starting the next time the internal combustion engine 1 is started The warm water supply amount Vres at the time of warming up before the next start changes. That is, as shown in FIG. 7, the warming-up before the next start increases as the water temperature Tea in the internal combustion engine after the warming-up before starting the internal combustion engine 1 increases and the temperature Tc of the hot water remaining in the heat storage container 15 increases. The hourly hot water supply amount Vres decreases.
[0099]
In the ROM of the ECU 39 and the like, as shown in FIG. 7, the warm water supply amount Vres before the next start-up and the internal-combustion-engine water temperature Tea after the start-up of the internal combustion engine 1 detected by the second water temperature sensor 18 are detected. And the relationship between the heat storage container outlet water temperature Tc detected by the first water temperature sensor 17 is recorded in advance as a three-dimensional map.
[0100]
In S204, the ECU 39 calculates the warm-up water supply amount Vres before warming up next time based on the three-dimensional map.
[0101]
Next, the ECU 39 proceeds to S205, and subtracts the warm-up water supply amount Vres before warming up next time calculated at S204 from the remaining hot water amount Vref calculated at S203 before starting the internal combustion engine 1. After warm-up, an afterheat hot water supply amount Vah, which is the amount of hot water that can be supplied to devices other than the internal combustion engine such as the heater core 12 and / or the ATF warmer 20, is calculated.
[0102]
After calculating the afterheat hot water supply amount Vah in S205, the ECU 39 proceeds to S206 and determines whether or not the afterheat hot water supply amount Vah calculated in S205 is greater than zero.
[0103]
If it is determined in S206 that the after-heat hot water supply amount Vah is 0 or less, the execution of this routine is temporarily terminated.
[0104]
If it is determined in S206 that the after-heat hot water supply amount Vah is 0 or more, the ECU 39 proceeds to S207 and determines which device according to the state of the devices other than the internal combustion engine 1, such as the heater core 12 and / or the ATF warmer 20. It is determined whether to supply the hot water remaining in the heat storage container 15.
[0105]
Next, the ECU 39 proceeds to S208, and supplies the hot water remaining in the heat storage container 15 to a device (for example, the heater core 12 and / or the ATF warmer 20) other than the internal combustion engine 1 that is the supply destination of the hot water determined in S207. The cooling water circulation circuit is switched so that it can be supplied.
[0106]
For example, if the hot water supply destination is determined to be the heater core 12 in S207, the ECU 39 shuts off the first heater hose 11a and the first warmer hose 19a, and the second heater hose 11b and the third bypass passage 13c. To control the flow path switching valve 16. Further, for example, when it is determined in S207 that the hot water supply destination is the ATF warmer 20, the ECU 39 shuts off the first heater hose 11a and the second heater hose 11b, and the first warmer hose 19a and the third heater hose 19b. The flow path switching valve 16 is controlled so as to communicate with the bypass passage 13c.
[0107]
Next, in S208, the ECU 39 switches the cooling water circulation circuit to a device other than the internal combustion engine 1 that is the supply destination of the hot water, and then proceeds to S209, where the ECU 39 other than the internal combustion engine that is determined as the supply destination of the hot water. The required operating time tah of the electric water pump 14 that circulates the hot water in order to supply the hot water to the apparatus is calculated.
[0108]
As described above, since the viscosity of the cooling water changes depending on the temperature, even if the afterheat hot water supply amount Vah, which is the amount of hot water supplied to the device other than the internal combustion engine, calculated in S205 is the same, the internal combustion engine The required operating time tah of the electric water pump 14 that circulates the hot water in order to supply the hot water to devices other than the engine is different. That is, as shown in FIG. 8, the required operating time tah for the electric water pump becomes shorter as the water temperature Tea in the internal combustion engine after warming up before starting the internal combustion engine 1 is higher. Moreover, the electric water pump required operating time tah becomes longer as the afterheat hot water supply amount Vah is larger.
[0109]
In the ROM of the ECU 39, the required operation time tah for the electric water pump, the water temperature Tea in the internal combustion engine after the start-up of the internal combustion engine 1 detected by the second water temperature sensor 18, as shown in FIG. The relationship with the hot water supply amount Vah is recorded in advance as a three-dimensional map.
[0110]
In S209, the ECU 39 calculates the required operating time tah for the electric water pump based on the three-dimensional map.
[0111]
Next, the ECU 39 proceeds to S210, permits power supply from the battery 43 to the electric water pump 14, and operates the electric water pump 14.
[0112]
In S211, the ECU 39 determines whether or not the operating time tp of the electric water pump 14 has passed the required operating time tah calculated in S209.
[0113]
The ECU 39 continues the operation of the electric water pump 14 when the operation time tp of the electric water pump 14 determines that the electric water pump required operation time tah has not elapsed in S211, and the operation of the electric water pump 14 is continued. When it is determined that the time tp has passed the electric water pump required operation time tah, the process proceeds to S212, the operation of the electric water pump 14 is stopped, and this routine is executed.
[0114]
As described above, by executing this routine, after the internal combustion engine 1 is temporarily stopped, the hot water required for warming up the internal combustion engine 1 before starting it is restarted next time before the internal combustion engine 1 is restarted. It can be secured in the heat storage container 15. For this reason, even if the internal combustion engine 1 is stopped after supplying hot water to a place other than the internal combustion engine 1 and before new hot water is recovered in the heat storage container 15, before the internal combustion engine 1 is restarted next time. It is possible to sufficiently warm up the internal combustion engine 1 before starting.
[0115]
In the present embodiment, the warm-up of the internal combustion engine 1 is the warm-up before the internal combustion engine 1 is started, but may be the warm-up when the internal combustion engine 1 is started.
[0116]
【The invention's effect】
According to the internal combustion engine provided with the heat storage device according to the present invention, when the internal combustion engine is warmed up before or at the start of the internal combustion engine, the warm-up execution command means sends an internal combustion engine warm-up execution command to the warm-up execution means. Since the heat medium circulation circuit is switched to the first circulation circuit through which the heat medium circulates via the internal combustion engine at a time before being discharged, a high-temperature heat medium is not supplied other than the internal combustion engine. At the same time, immediately after the start of warming up of the internal combustion engine, a high-temperature heat medium is supplied to the internal combustion engine, so that the internal combustion engine can be warmed up quickly.
[0117]
In addition, after the internal combustion engine is temporarily stopped, the internal combustion engine is ensured in the heat storage container with a high-temperature heat medium necessary for warming up the internal combustion engine before or at the next start of the internal combustion engine. It is possible to prevent a shortage of heat medium for warming up the vehicle.
[0118]
As a result, according to the internal combustion engine including the heat storage container according to the present invention, it is possible to reliably warm up the internal combustion engine without deteriorating the warm-up efficiency.
[Brief description of the drawings]
FIG. 1 is a diagram showing a cooling water circulation system of an internal combustion engine equipped with a heat storage device according to the present invention.
FIG. 2 is a diagram showing circulation of cooling water when warming up before starting an internal combustion engine equipped with a heat storage device in the first embodiment;
FIG. 3 is a flowchart showing first circulation circuit switching control when the internal combustion engine is stopped in the first embodiment.
FIG. 4 is a diagram showing a circulation circuit when hot water is supplied to a heater core of an internal combustion engine equipped with a heat storage device in the second embodiment.
FIG. 5 is a diagram showing a circulation circuit when hot water is supplied to an ATF warmer of an internal combustion engine equipped with a heat storage device in a second embodiment.
FIG. 6 is a diagram showing a relationship among a water temperature in an internal combustion engine before warming up before starting, an electric water pump operating time, and a hot water supply amount during warming up before starting;
FIG. 7 is a diagram showing the relationship among the water temperature in the internal combustion engine after warming up before starting, the water temperature at the outlet of the heat storage container, and the warm water supply amount during warming up before starting
FIG. 8 is a graph showing the relationship among the water temperature in the internal combustion engine before warm-up before start-up, the amount of after-heat hot water supplied, and the required operating time of the electric water pump
FIG. 9 is a flowchart showing a hot water supply control routine for supplying hot water to a device other than the internal combustion engine in the second embodiment.
[Explanation of symbols]
1 ... Internal combustion engine
1a ... Cylinder head
1b ... Cylinder block
2a: Head side cooling water channel
2b Block side cooling water channel
5. Radiator
10 ... Mechanical water pump
11a ... 1st heater hose
11b ... second heater hose
11c ... Third heater hose
11d ... Fourth heater hose
12 ... Heater core
13a ... 1st bypass passage
13b ... second bypass passage
13c ... third bypass passage
14 ... Electric water pump
15 ... Thermal storage container
15a ... Cooling water inlet
15b ... Cooling water outlet
16 ... Flow path switching valve
17 ... 1st water temperature sensor
18 ... Second water temperature sensor
19a ... 1st warmer hose
19b ... Second warmer hose
20 ... ATF warmer
31 ... Internal circuit circulation circuit
32 ... Heater core circulation circuit
33 ... ATF warmer circuit
39 ... ECU
40 ... Ignition switch
41 ... Starter switch
42 ... Heater switch
43 ... Battery

Claims (3)

A heat storage container for storing the heat medium in a heat storage state;
A first circulation circuit in which the heat medium circulates via an internal combustion engine;
A second circulation circuit in which the heat medium circulates via a device other than the internal combustion engine;
Heat medium heat capacity calculating means for calculating the heat capacity of the high temperature heat medium remaining in the heat storage container after warming up the internal combustion engine by circulating the high temperature heat medium stored in the heat storage container to the first circulation circuit When,
Circulation circuit switching means for switching between the first circulation circuit and the second circulation circuit,
The heat capacity of the high temperature heat medium remaining in the heat storage container after warming up the internal combustion engine calculated by the heat medium heat capacity calculation means is equal to or greater than a predetermined amount, and a device other than the internal combustion engine has a high temperature. An internal combustion engine comprising a heat storage device, wherein when a heat medium needs to be supplied, second circulation circuit switching control is performed to switch the circulation circuit to the second circulation circuit by the circulation circuit switching means. The predetermined amount is a heat capacity required for the next engine warm-up required to warm up the internal combustion engine before or when the internal combustion engine is restarted next time after the internal combustion engine is temporarily stopped. An internal combustion engine comprising the heat storage device according to claim 1 . The internal combustion engine with a heat storage device according to claim 2 , wherein the heat capacity required for the next engine warm-up is determined by a temperature of the heat medium in the first circulation circuit.

Images