JPH0478489B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner for a vehicle that takes into account ram pressure when the vehicle is running.

The outside air intake of a vehicle air conditioner is set at a location where it is affected by the ram pressure that normally occurs when the vehicle is running, and when the windows (including the sunroof) are opened while the vehicle is running, the area of the vehicle's air outlet increases. As a result, the pressure inside the vehicle decreases, and the amount of air passing through the air conditioner increases. This causes the following problems.

(b) Since a Shirotsuko fan is used as a blower fan, the amount of work of the blower motor increases, and the power consumption of the blower motor increases, exceeding the operating power limit, and deteriorating the performance and life of the blower motor.

(b) Each part of the terminal deteriorates due to excessive current flowing through it.

c) The capacity of the alternator is insufficient, which adversely affects other parts that use electricity.

An object of the present invention is to reliably prevent an excessive increase in the workload of the blower motor due to the ram pressure and the drop in pressure inside the passenger compartment that occurs when the window is opened while the vehicle is running, and to solve the above-mentioned problems associated with this. Our goal is to provide a vehicle air conditioning system that can.

In the first aspect of the vehicle air conditioner of the present invention, the air conditioner includes an outside air intake that is affected by ram pressure when the vehicle is running, and a blower is installed in the duct, and detects opening/closing of a window. A window opening/closing sensor switch, a relay contact connected in series with the blower motor, and a relay that opens the relay contact when the window opening/closing sensor switch detects the open state of the window, and a relay connected in parallel to the relay contact. and an electric resistor.
Further, in a second invention, in an air conditioner including an outside air intake that is affected by ram pressure when a vehicle is running and a blower installed in a duct, a window opening/closing sensor switch for detecting opening/closing of a window; A negative pressure switching valve for switching between the engine intake negative pressure and the atmosphere in order to operate a ventilation resistance increase/decrease means for increasing/decreasing ventilation resistance in the engine, and a contact point connected in series to the negative pressure switching valve. The present invention further includes a relay that opens and closes the relay contact according to the detection state of the window opening/closing sensor switch.

With this configuration, the vehicle air conditioner of the present invention can prevent an excessive increase in the workload of the blower motor when the window is opened while the vehicle is running, or when the vehicle speed increases while the window is open. Despite its circuit configuration, it has the following effects.

a) The blower motor can be used within the operating power limit and the performance of the blower motor can be maintained.

b Excessive current does not flow through each part of the terminal, preventing deterioration of the terminal.

c. Current can be supplied within the alternator's capacity, so other electrical components are not affected.

d) Fuel consumption is reduced because extra load on the alternator can be prevented.

e It is possible to prevent the deterioration of the senses of the occupants due to changes in vehicle speed and changes in the air volume of the air conditioner vents due to opening and closing of windows.

As described above, the present invention uses a window opening/closing sensor switch and a relay that is energized according to the detection state of this switch, so the circuit configuration is simple without using a complicated amplifier circuit or control circuit. Accordingly, when the internal pressure in the vehicle cabin decreases when the window is opened, an increase in the power of the blower can be prevented and the power consumption of the blower motor can be suppressed.

Next, the present invention will be described in a first embodiment shown in FIGS. 1 and 2.
This will be explained based on examples.

Reference numeral 1 denotes a blower motor energization circuit of a vehicle air conditioner, which is connected in series to the motor 2 that drives the fan 22 of the blower 21 of the vehicle air conditioner, and the blower motor energization circuit 1 to provide electric resistance to the motor 2 and control its rotation. A variable resistor 3 consisting of a series of electrical resistors 31, 32 and 33 connected to each other and a series of electrical resistors 31, 32 and 33 normally set on the front panel of the vehicle compartment are selected, and the motor 2 an OFF contact 40 that stops energizing the
The motor 2 is energized through the electric resistors 31, 32, and 33, and the blower 21 is driven with a minimum air volume. The third contact 43, which is energized only through the electrical resistor 31, 3
The blower 21 includes a blower air volume adjustment switch 4 that controls the rotational speed of the motor 2 and has a fourth contact 44 that drives the blower 21 at the maximum air volume. Reference numeral 5 denotes a blower motor energization amount control circuit, which includes a relay 6 having a built-in contact 61 on the circuit that supplies current to the blower motor energization circuit 1, and an outside air intake of the air conditioner provided in parallel with the contact 61 of the relay 6. The electrical resistor 7 has an appropriate value to absorb the increase in power consumption due to the ram pressure applied to the vehicle and the drop in pressure inside the vehicle when the window is opened, and detects the opening and closing of windows that can be opened and closed, such as side windows or sunroofs. For example, the window opening/closing sensor 8 is comprised of a micro switch or the like that detects the position of the window shield glass. When current is supplied to the motor 2 and the blower 21 is driven, when the window is closed, the window open/close sensor 8 conducts current to the relay 6, closing the contact 61 in the relay 6, and transmitting current from the power source to the motor 2. When conduction is established and the window is open, the window opening/closing sensor 8 stops supplying current to the relay 6, opens the contacts in the relay 6, and connects the electric resistor 7 to the circuit supplying current to the blower motor energizing circuit 1. By intervening, the power consumption of the motor 2 is suppressed.

Figure 2 shows the characteristics of the vehicle speed and the current I flowing through the motor 2 when the blower air volume adjustment switch 4 is connected to the fourth contact 44 and current is supplied to the motor 2 from a power source consisting of an alternator and battery (not shown). In the graph, Cl indicates when the vehicle was driven with the windows closed, and Op indicates when the vehicle was driven with the windows open. Let D be the limit capacity of the alternator that supplies current to the motor 2. For example, when the vehicle is running at speed C, the current used by the motor 2 with the windows closed is , and if it is below the limit capacity of the alternator, there is no problem. do not have.
The current used by the alternator with the windows open is c´
This will exceed the alternator's capacity limit.
By using the blower motor energization amount control circuit 5 of the present invention, the window open/close sensor 8 is opened, the contact 61 in the relay 6 is opened, and the electric resistor 7 is intervened in the circuit that supplies current to the motor 2. The current used is suppressed to a point below the alternator's critical capacity.

FIG. 3 shows a second embodiment of the invention. 9 is a vehicle speed sensor that detects the vehicle speed from a vehicle speed indicator or a vehicle speed signal, etc.; 90 is a control circuit; a statement 91 corresponding to the window opening/closing sensor 8; a statement 92 indicating vehicle speed less than A and vehicle speed A; and statement 92 indicating vehicle speed less than B. and statement 93 for vehicle speed B or higher.
Statement 91 and statement 92 are led to AND gate 94,
Statement 93 and AND gate 94 are led to OR gate 95 and are electrically connected to relay 6 via transistor 96 and diode 97.

The operation of the second embodiment is such that when the vehicle is running at a low speed from a stop to a vehicle speed A, the power consumption of the motor 2 is as follows.
Regardless of whether the window is opened or closed, there is no problem within the limit capacity of the alternator, so no current is supplied to the relay 6 and the contact 61 is closed regardless of whether the window is opened or closed, and the electric resistor 7 is not intervened in the motor 2. When the vehicle is running at a medium speed from vehicle speed A to vehicle speed B, the power consumption of motor 2 is greater than the limit capacity of the alternator only when the window is open, so opening and closing the window activates relay 6, and the window is open. Current is supplied to the relay 6 to open the contact 61, and the electric resistor 7 is intervened in the motor 2, so that the power consumption of the motor 2 is controlled. When the vehicle speed is higher than vehicle speed B, the power consumption of the motor 2 exceeds the alternator's limit capacity regardless of whether the window is opened or closed, so current is constantly supplied to the relay 6, contacts 61 are opened, and the motor 2 The power consumption of the motor 2 is controlled by constantly intervening with the electric resistor 7, but only when the window is closed and the window is opened within the alternator's limit capacity, the capacity exceeds the alternator's limit. The frequency of opening and setting the blower air volume adjustment switch 4 to the fourth contact 44 is small and there is no problem. As a result, the amount of air blown and the power consumption of the blower remain constant regardless of whether the window is opened or closed or the vehicle speed.

FIG. 4, FIG. 5, and FIG. 6 show an embodiment of the third invention of the present application. 70 is a damper drive mechanism, 71
72 is a negative pressure pipe having an appropriate length that leads negative pressure from the engine; 73 is a relay 6 that connects the negative pressure led by the negative pressure pipe 72 and the atmosphere; 74 is an atmospheric air filter that introduces atmospheric air into the negative pressure switching valve 73; 75 is a negative pressure switching valve 7;
A diaphragm type negative pressure servo expands and contracts by the supply of negative pressure from 3, and 76 is a ventilation resistance damper installed inside the outside air intake port 24 of the fan case 23, and is driven by the expansion and contraction of the diaphragm type negative pressure servo 75. The connecting hand 77 increases or decreases the resistance to the air sucked in from the outside air intake port 24.

To explain the operation of this third embodiment, when the blower air volume adjustment switch 4 is turned on from the alternator and battery to supply current to the motor 2, the window open/close sensor 8 is opened when the window is closed.
Contact 61 in relay 6 is also opened, and negative pressure switching valve 7
3 conducts the atmosphere to the diaphragm type negative pressure servo 75, and when the diaphragm type negative pressure servo 75 is extended, the ventilation resistance damper 76 in the outside air intake port 24 does not act as a resistance element for outside air intake, and the motor 2 is connected to the outside air. can be sucked through the outside air intake port 24 without being subjected to resistance from the ventilation resistance damper 76. When the window is open, the window opening/closing sensor 8 is turned on, the contact 61 in the relay 6 conducts current to the negative pressure switching valve 73, and the negative pressure switching valve 73 transfers negative pressure to the diaphragm type negative pressure servo 75. Since the diaphragm type negative pressure servo 75 pulls the connecting hand 77, the ventilation resistance damper 76 partially blocks the outside air intake 24, and becomes a ventilation resistance for outside air inside the outside air intake 24, causing the outside air to flow into the blower 21. The power consumption of the motor 2 is controlled by suppressing the ventilation amount of outside air.

In the above embodiment, the diaphragm type negative pressure servo 75
Although the ventilation resistance damper 76 is driven using negative pressure, the ventilation resistance damper 76 may be driven using a servo motor or the like.

As shown in Fig. 6, even if there is no problem with power consumption depending on the vehicle speed, in order to prevent the sense of sensation from increasing due to an increase in air volume, the window opening/closing sensor 8 is replaced with a vehicle speed sensor 9, etc., and an air conditioner is installed that reduces the air volume from e' to e' at vehicle speed E. It can also be used in the above embodiment, in which case the vehicle speed E
It is also possible to install a timer to prevent chattering in the vicinity. It is also possible to set the vehicle speed sensor 9 that detects the vehicle speed in several stages or in a stepless manner, and to drive the air blowing amount adjustment mechanism in accordance with the vehicle speed.

[Brief explanation of drawings]

Fig. 1 is an electric circuit diagram of the first embodiment, Fig. 2 is a graph showing current on the vertical axis and vehicle speed on the horizontal axis, Fig. 3 is an electric circuit diagram of the second embodiment, and Fig. 4 is a graph of the third embodiment. An electric circuit diagram and a front sectional view of the air conditioner of the embodiment, FIG. 5 is a side sectional view of the air conditioner of the third embodiment,
FIG. 6 is a graph in which the vertical axis represents the air volume and the horizontal axis represents the vehicle speed. In the figure, 1...Blower motor energization circuit, 2...Motor, 3...Variable resistor, 4...Blower air volume adjustment switch, 5...Blower motor energization amount control circuit, 6...Relay, 7...Electric resistor, 8...Window opening/closing sensor, 9...Vehicle speed sensor, 21...Blower, 22...Fan, 24...
Outside air intake, 70... Damper drive mechanism, 73... Negative pressure switching valve, 75... Diaphragm type negative pressure servo, 76
...ventilation resistance damper.

Claims (1)

[Scope of Claims] 1. In an air conditioner equipped with an outside air intake that is affected by ram pressure when a vehicle is running and a blower installed in a duct, there is provided a window opening/closing sensor switch that detects opening/closing of a window;
a relay having a relay contact connected in series with the blower motor and opening the relay contact when the window open/close sensor switch detects a window open state;
An air conditioner for a vehicle, comprising: an electric resistor connected in parallel to the relay contact. 2. The air conditioner for a vehicle according to claim 1, further comprising a vehicle speed sensor that detects the vehicle speed of the vehicle, and controlling energization of the relay according to the output of the vehicle speed sensor. 3. In an air conditioner equipped with an outside air intake that is affected by ram pressure when the vehicle is running and a blower installed in the duct, a window opening/closing sensor switch that detects opening/closing of a window;
A negative pressure switching valve for switching between engine intake negative pressure and atmospheric air in order to operate a ventilation resistance increase/decrease means for increasing/decreasing ventilation resistance in the duct, and a relay contact connected in series to the negative pressure switching valve. and a relay that opens and closes the relay contact according to a detection state of the window opening/closing sensor switch. 4. The vehicle according to claim 3, wherein the ventilation resistance increasing/decreasing means comprises a damper for increasing/decreasing ventilation resistance installed in the duct, and a damper drive mechanism for driving the damper. Air conditioner. 5. The vehicle air conditioner according to claim 3, wherein the ventilation resistance increasing/decreasing means is driven in accordance with the output of a vehicle speed sensor. 6. The damper drive mechanism includes a diaphragm negative pressure servo that is operated by supplying negative pressure from the negative pressure switching valve, and a link mechanism between the diaphragm negative pressure servo and the damper. The vehicle air conditioner according to any one of item 3 or 4.