JPH0532329Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Purpose of the invention] (Field of industrial application) The invention is designed to automatically start a combustion heater when there is insufficient heating in the passenger compartment, for example in cold regions. The present invention relates to a control device for a combustion type heater.

(Prior art) Generally, a portion of the high-temperature engine cooling water after cooling the engine is used as a heat source for heating the cabin of a vehicle. If the engine coolant is low, or if the interior volume of the vehicle is large, such as in a microbus or one-box car, the heat capacity will be insufficient if the engine coolant is used as the only heat source. A supplementary combustion heater is used.

In an automobile heating system using such a combustion type heater, the hot air generated by the combustion type heater is heat exchanged with this engine cooling water, and this engine cooling water is used to heat the air blown into the passenger compartment. are being exchanged. This type of heating device for automobiles is described, for example, in Japanese Utility Model Application Publication No. 58-21756, and the general control circuit for this combustion type heater is as shown in Figure 2. There is.

As shown in the figure, the + terminal of battery 1 has
Ignition switch 2 that starts the engine and main switch 3 that operates the combustion heater
A series circuit consisting of is connected. The main switch 3 receives signals outputted from an exhaust temperature sensor 5 that detects the exhaust temperature and a temperature sensor 6 that detects the temperature of the engine cooling water as input signals for controlling the combustion type heater. An operation control circuit 7 for controlling the operation of the combustion type heater is connected.

A combustion type heater main body 17 is connected to the operation control circuit 7. Also, inside the air conditioner main body 19, a heater core 1 is provided which heats the air supplied by the fan 15 that takes in the air.
6, and a mix door 18 for adjusting the amount of air flowing into the heater core 16.
7 is connected. The rotational speed of the fan 15 is adjusted by a fan control lever 11, and the opening degree of the mixer door 18 is adjusted by a temperature control lever 4, respectively. This operation control circuit 7 operates when both the ignition switch 2 and the temperature control switch 3 are ON (when the set value of the air outlet temperature into the passenger compartment is near the maximum value), and the combustion type heater is activated by the exhaust temperature sensor. The detected temperature of the water temperature sensor 5 is below a predetermined value (the operation control circuit 7 stops the combustion type heater when the exhaust temperature exceeds a predetermined value as a measure against abnormally high temperatures), and the water temperature sensor 6
It is activated when the detected temperature is below a predetermined value, and hot water is supplied to the heater core 16 via the pipe 20.

(Problem to be solved by the invention) However, in the case of such a conventional control device for a combustion type heater, it is operated by an independent circuit that is separated from the air conditioner installed in the passenger compartment. Therefore, in order to operate it, you must turn on the main switch 3 and operate the temperature control lever 4 on the vehicle side and the fan control lever 11 on the vehicle side, which are independent of the combustion heater. However, the operation is troublesome, and since the operation must be performed by the passenger while driving, there is also a problem in terms of safety.

The present invention was developed in order to eliminate such conventional problems, and it electrically connects the control circuit between the combustion heater and the air conditioner to ensure that the set value by the temperature control lever exceeds a predetermined temperature. It is an object of the present invention to solve the above problems by automatically operating the combustion type heater when the fan motor is rotating.

[Structure of the invention] (Means for solving the problem) In order to achieve the above object, the present invention provides an operation control for controlling the operation of a combustion type heater that provides auxiliary heating for an air conditioner installed in a vehicle interior. circuit and
The air conditioner is provided with a temperature control means for adjusting the temperature of the air to be blown into the vehicle interior, an air volume control means for regulating the amount of air to be blown into the vehicle interior, and a temperature control means for controlling the temperature of the air to be blown into the vehicle interior. If the temperature of the air set by the airflow control means is equal to or higher than a predetermined value, and the amount of air blown out adjusted by the air volume adjustment means is equal to or higher than the predetermined value, the operation control circuit is automatically activated. It is characterized by having a means.

(Function) By configuring the control device for the combustion type heater as described above, even if the occupant activates the combustion type heater while the vehicle is running, the set value of the temperature control lever can be increased. Since it is only necessary to do so, the operability is improved.

(Example) Examples of the present invention will be described in detail below based on the drawings.

FIG. 1 shows a control circuit diagram of a combustion type heater according to the present invention.

As shown in the figure, the + terminal of battery 1 has
Ignition switch 2 connected to relay 8
and a temperature control lever 4 as a temperature adjustment means that slides into contact with the contacts 4a and 4b of the contact board 4c.
is connected to a movable contact (not shown), and a relay 10 as a determining means is connected to the contact 4b. Further, the + terminal of the battery 1 is connected to a means switch 15 for manually operating the combustion heater as in the past, a B contact 9a of a relay 9 as a determining means, and a fan (not shown) for drawing air into the passenger compartment. A movable contact (not shown) of the fan control lever 11 as an air volume adjusting means that slides into contact with the contacts 11a to 11d of the contact board 11e that applies voltage to the fan motor 14 to be driven is connected. The A contact 8a of the relay 8 is connected to the contact 11a via the relay 9.
The fan motor 14 is connected to the contact 11b and the contact 11c via the resistor 12 and the resistor 13.
A fan motor 14 is connected to each of the fan motors 1d. The operation control circuit 7 also includes a
A B contact 9a is connected via a contact 10a, and an exhaust temperature sensor 5 that detects the exhaust gas temperature of the combustion heater and a temperature sensor 6 that detects the temperature of engine cooling water are also connected.

The control circuit configured as described above controls the operation of the combustion type heater in the following manner.

First, when a passenger starts the vehicle's engine, the ignition switch 2 is turned ON, so the relay 8 is activated and the contact 8a is closed.If the fan control lever 11 is in the OFF position, the relay 9 is also activated. to open contact 9a. For this,
If the manual switch 15 is not turned on, no voltage will be applied to the operation control circuit 7 and the combustion heater will not operate. On the other hand, if the fan control lever 11 is in a position other than OFF (LOW, MI, HI), the relay 9 will not operate, so the contact 9a will be closed and the fan motor 14 will operate according to the set position of the fan control lever 11. rotates at a rotational speed of

Furthermore, if the movable contact (not shown) of the temperature control lever 4 is not in sliding contact with the contact 4c (on the COLD side), the relay 10 will not operate.
Contact 10a remains open. Incidentally, the set temperature (position) of the temperature control lever 4 at which the movable contact slides into contact with the contact 4c will be calculated as appropriate through experiments or the like.

Next, when the occupant senses insufficient heating in the vehicle interior while driving and increases the set temperature of the temperature control lever 4 to a predetermined temperature, the movable contact changes to the contact 4.
c, and the relay 10 operates. As a result, a voltage is applied to the operation control circuit 7 via the contact 10a and the contact 9a.

Therefore, the fan control lever 11
When the temperature control lever 4 is set to a position other than OFF and the set temperature of the temperature control lever 4 is increased to a predetermined temperature, a voltage is applied to the operation control circuit 7 and the combustion type detected by the exhaust temperature sensor 5 is When the exhaust gas temperature of the heater is below a predetermined value and the engine cooling water temperature detected by the water temperature sensor 6 is below a predetermined value, the operation control circuit 7 operates the combustion type heater. . Then, when the temperature inside the vehicle reaches the temperature requested by the occupant, the occupant lowers the set value of the temperature control lever 4 or turns off the fan control lever 11, so that either the contact 10a or the contact 9a is opened. The combustion heater will automatically stop operating.

Further, since the contact 9a is short-circuited by turning on the manual switch 15, it is also possible to control in the same manner as in the conventional case.

In the embodiment described above, the most common circuit using a relay was described, but the present invention is not limited to such a circuit.
Various modifications are possible. For example, it is of course possible to perform the same operation as described above using electronic circuits, microcomputers, etc. that have recently been installed in high-end automobile models.

``Effect of the invention'' As is clear from the above explanation, in this invention, when the set value of the temperature control lever is higher than the predetermined temperature and the fan motor is rotating, the combustion type heater is automatically activated. This makes it possible to automatically activate the combustion heater as needed when the occupants feel that there is insufficient heating in the vehicle interior, improving operability and improving driving safety. can also be improved.

[Brief explanation of the drawing]

FIG. 1 is a control circuit diagram of a combustion type heater according to the present invention, and FIG. 2 is a control circuit diagram of a conventional combustion type heater. 1... Battery, 2... Ignition switch, 3... Temperature control switch, 4... Temperature control lever (temperature control means), 5... Exhaust temperature sensor,
6...Water temperature sensor, 7...Operation control circuit, 9,1
0...Relay (determination means), 11...Fanco control lever (air volume adjustment means), 12, 13...
Resistor, 14...Fan motor, 15...Manual switch, 16...Heater core, 18...Mix door, 19...Air conditioner body, 20...
Piping.

Claims (1)

[Scope of utility model registration request] An operation control circuit 7 that controls the operation of a combustion heater that provides auxiliary heating for an air conditioner installed in the vehicle interior, and a temperature controller that is provided in the air conditioner and adjusts the temperature of the air to be blown into the vehicle interior. means 4, air volume adjustment means 11 for adjusting the amount of air to be blown into the vehicle interior, and temperature adjustment means 4.
When the temperature of the air set by the air flow control means 11 is higher than a predetermined value and the air flow rate adjusted by the air volume adjustment means 11 is higher than a predetermined value, the operation control circuit 7 automatically A control device for a combustion type heater, characterized in that it has judgment means 9 and 10 for operating.