JPH08244448A - Air conditioner control device for vehicle - Google Patents

Abstract

PURPOSE: To prevent uncomfortableness from being given to occupants by blown air temperature and keep a balance of cooling capacity with accelerating performance by maintaining sufficient cooling performance at the abrupt acceleration of a vehicle. CONSTITUTION: An air conditioner control device for vehicle is provided with an air conditioner relay circuit 12 which controls the operation of a compressor 11, a controller 13 which detects a current engine loading condition and outputs ON-OFF control signals to the air conditioner relay circuit 12, a variable thermo-switch 18 which outputs cabin temperature set signals to the controller 13 through a thermo amplifier 14, and an air conditioner cutout circuit 17 which outputs air conditioner cutout signals at abrupt acceleration. Also, a shutoff circuit 20 which shuts off cutout signals from the air conditioner cutout circuit 17 to the controller 13 when the variable thermo-switch 18 is set at a FULL COLD point is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner control device for controlling an indoor temperature of a vehicle, and more particularly to an air conditioner control device for cutting off an air conditioner under a predetermined high load condition of an engine.

[0002]

2. Description of the Related Art As a conventional air conditioner control device of this type, for example, there is one as shown in FIG. 10 (new model car manual (K30-1), NISSAN crew K30 type car, date of issue July 1993).・ Issuer Nissan Motor Co., Ltd., Service Engineering Department, Technical Section, see E-10).

That is, a compressor 1 for compressing a refrigerant
Is controlled ON / OFF by the air conditioner relay circuit 2, and the operation of the air conditioner relay circuit 2 is controlled by an ON / OFF control signal from the controller 3 which detects the engine load state. Also,
The controller 3 detects the engine speed and the load based on information signals from the crank angle sensor, the air flow meter, and the steering wheel angle sensor, and also detects the speed of the blower fan motor. Furthermore, the controller 3
Is a thermo-amplifier 4 that detects the temperature of the evaporator (not shown) and the temperature of the air blown from the evaporator to prevent freezing.
The output signal from is input and is connected to the air conditioner switch 5 via the thermoamplifier 4.
Further, a dual pressure switch 6 is arranged between the controller 3 and the air conditioner relay circuit 2.

In the controller 3, the air conditioner relay circuit 2 is turned off according to the high engine load state.
An air conditioner cut circuit 7 that outputs a signal is connected. That is, when the amount of depression of the accelerator pedal becomes 7/8 or more, or when the accelerator pedal is suddenly accelerated for sudden acceleration or when the steering wheel is fully turned, the engine load increases by a predetermined amount or more, and for example, the engine speed increases. Rise to about 5,400 ~
When it reaches 5,500 rpm, the air conditioner cut circuit 7 detects this and stops the operation of the compressor 3 through the air conditioner relay circuit 2 for about 3 to 5 seconds to perform air conditioner cut control. As a result, engine output is prioritized and acceleration feeling is improved.

[0005]

However, in such a conventional air conditioner control device, as described above, when the engine load rises above a predetermined level during sudden acceleration, the air conditioner automatically and uniformly. The cut circuit 2 performs air-conditioner cut control. In this way, the output of the engine is always prioritized when the vehicle accelerates above a predetermined level, so that the cooling power becomes insufficient, for example, when it is extremely hot, and the blower blowout temperature rises, which makes passengers uncomfortable. It will be.

The present invention has been made in view of such conventional problems. When the cooling force is required, the cooling force is prioritized even when the vehicle is accelerated more than a predetermined level, thereby making the occupant uncomfortable. An object of the present invention is to provide a vehicle air conditioner control device that can be eliminated.

[0007]

In order to solve the above problems, first, in the invention of claim 1, as shown in FIG. 1, an air conditioner relay circuit 102 for controlling the operation of a compressor 101, and A controller 103 that detects an engine load state and outputs an ON-OFF control signal to the air conditioner relay circuit 102, and a variable thermoswitch 105 that outputs a manually set indoor temperature signal to the controller 103 via a thermoamplifier 104. In the vehicle air conditioner control device including an air conditioner cut circuit 106 for temporarily outputting an air conditioner cut signal from the controller 103 to the air conditioner relay circuit 102 according to a high engine load state, the variable thermoswitch 105
Together with the air conditioner cut circuit 106,
At a predetermined cold point position of the variable thermo switch 105, a shutoff means 107 for shutting off the air conditioner cut signal output from the air conditioner cut circuit 106 to the controller 103 is provided.

According to a second aspect of the present invention, an air conditioner relay circuit for controlling the operation of the compressor, an auto amplifier for outputting an ON-OFF control signal to the air conditioner relay circuit according to the current engine load state, and an engine high load state. An air conditioner cut circuit for temporarily outputting an air conditioner cut signal from the auto amplifier to the air conditioner relay circuit, and a rotation speed detection sensor for detecting the rotation speed of the blower fan motor and outputting the detection signal to the auto amplifier. In a vehicle air conditioner control device having the above, the auto amplifier is provided with a control circuit for controlling an air conditioner cut time of the air conditioner cut circuit according to a rotation speed of a blower fan motor.

[0009]

According to the first aspect of the present invention, for example, when the vehicle is rapidly driven at a low speed and sudden acceleration is performed, the engine becomes in a high load state, and the controller 103 controls the air conditioner relay circuit 102 based on the control signal from the air conditioner cut circuit 106. Output the air conditioner cut signal for 2 seconds. However, if the variable thermo switch 105 is set to the maximum cold point by manual operation in advance, the air-conditioner cut output signal from the air-conditioner cut circuit 106 to the controller 103 is output from the air-conditioner cut circuit 106 to the controller 103 even in the high engine load state as described above. Is cut off and air conditioner cut control is no longer performed. Therefore, the air-conditioner control is prioritized on the cooling power.

According to the second aspect of the present invention, the air conditioner cut control is performed in the high engine load state at the time of the rapid acceleration of the vehicle as described above, but when the rotation speed of the blower fan motor is high, the controller that detects this is performed. Determines that a sufficient cooling power is currently required, and controls the air conditioner cut time by the air conditioner cut circuit to an extremely short time through the control circuit.

On the other hand, when the rotation speed of the blower fan motor is low, it is determined that the controller does not currently require a large cooling power, and the control circuit controls the air conditioner cut circuit to control the air conditioner cut time to a long time.

As a result, one of the cooling power (cooling performance) and the engine output (acceleration performance) can be preferentially controlled according to the vehicle compartment temperature and the engine load condition, and more accurate air conditioner control can be performed. .

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing an embodiment of the air conditioner control device according to the invention of claim 1, and the basic configuration is substantially the same as the conventional one.

That is, the compressor 11 for cooling the refrigerant
And an air conditioner relay circuit 12 for controlling ON / OFF of the operation of the compressor 11, and the air conditioner relay circuit 1
And a controller 13 that controls the operation of the device 2. The controller 13 is a load signal based on an engine speed (rpm) signal from a crank angle sensor, an intake air amount signal from an air flow meter, and a signal from a steering wheel angle sensor, and various sensors such as a throttle valve switch and a water temperature sensor. The current engine load state is detected by inputting the information signal from the class.

The controller 13 is connected to the air conditioner switch 15 via the thermo-amplifier 14 and is also connected to the air conditioner relay circuit 12 via the dual pressure switch 16. Further, an air conditioner cut circuit 17 is connected to the controller 13, and this air conditioner cut circuit 17 is used, for example, when the vehicle is driven at a low speed and the accelerator pedal is depressed by about 7/8 to perform rapid acceleration. Circuit 12 about 3
It is designed to be turned off for ~ 5 seconds.

On the other hand, the thermo-amplifier 14 is connected to a variable thermo-switch 18 which shifts the ON-OFF temperature of the thermo-amplifier 14 up to set the passenger compartment temperature. The variable thermoswitch 18 is a dial type as shown in FIGS. 3A and 3B, and the left and right HOT-COL
A predetermined vehicle interior temperature can be set by manually rotating the knob 19 between D.

The air conditioner cut circuit 17 is connected to the variable thermoswitch 18 so as to interlock, and at the FULL COLD point position of the knob 19,
A cutoff circuit 20 for cutting off the air conditioner cut signal from the air conditioner cut circuit 17 to the controller 13 based on a signal from a position detection sensor (not shown) is provided.

In the present embodiment having the above structure,
When the knob 19 of the variable thermo switch 18 is operated in advance with the air conditioner switch 15 turned on and set to a position other than the FULL COLD point as shown in FIG. 3A, for example, while the vehicle is traveling, the accelerator pedal is set to 7/8
When the vehicle is depressed to a certain degree and suddenly accelerated, the controller 13 outputs an OFF signal to the air conditioner relay circuit 12 for several seconds based on the output signal from the air conditioner cut circuit 17, as shown in FIG. Therefore, the operation of the compressor 11 is stopped and the engine output, that is, the acceleration feeling is improved.

On the other hand, the knob 1 of the variable thermoswitch 18
9 is preset at the FULLCOLD point position as shown in FIG. 3B, the air-conditioner cut signal output from the air-conditioner cut circuit 17 during the sudden acceleration of the vehicle shown in FIG. hand,
It is no longer input to the controller 13. Therefore, the cooling force is prioritized over the engine output, and the required cooling force can be secured, and as a result, the passenger's discomfort due to the blower blow temperature can be prevented.

FIG. 5 is a diagram showing a first embodiment of an air conditioner control device according to the invention of claim 2, which is applied to a so-called automatic air conditioner. That is, the air conditioner relay circuit 12 that controls the operation of the compressor 11 is turned on by the control signal output from the auto amplifier (AMP) 21.
-OFF control. An information signal from a controller (not shown) for detecting an engine load state and an air conditioner cut signal from an air conditioner cut circuit 22 are input to the auto amplifier 21 via the controller.

Further, the auto amplifier 21, as shown in FIG. 6, has an air conditioner cut signal from the air conditioner cut circuit 22, a room temperature setting section 24, and an inker sensor 25.
The information signals from the ambi sensor 26 and the sun sensor 27 are input to the A / D converter 28. Further, from the A / D converter 28, a target outlet temperature calculation circuit 29
Then, the information signal is input to the air volume calculation circuit 30 which calculates the air volume of the blower fan motor 31 based on the output signal from the target outlet temperature calculation circuit 29.

The air volume calculation circuit 30 outputs a control signal to a drive circuit 32 for driving and controlling the blower fan motor 31, and also outputs it to an air conditioner cut time calculation circuit 33. The air-conditioner cut time calculation circuit 33, when the air-conditioner cut signal of the air-conditioner cut circuit 22 is input, when the air volume is less than a predetermined value based on the signal calculated by the air volume calculation circuit 30, the air-conditioner cut circuit 22 cuts off the air conditioner. The time is set to a relatively long time, for example, about 5 seconds, and when the air volume is a predetermined value or more, the air conditioner cut time is set to a short time (see FIG. 7). Further, the signal output from the air conditioner cut time calculation circuit 34 is output to the air conditioner switch switching circuit 35, and from here, a control signal is output to the air conditioner switch 36 in accordance with the set time.

Therefore, in this embodiment, when the air volume calculation circuit 30 of the auto amplifier 21 determines that the air volume is below a predetermined value when the vehicle is rapidly accelerated as described above,
Assuming that sufficient cooling power is not required, the air conditioner cut time calculation circuit 34 sets the air conditioner cut time to be long as shown in FIG. Therefore, the acceleration performance is prioritized over the cooling performance, and the acceleration feeling is improved.

On the other hand, when it is judged that the air volume is equal to or more than the predetermined value, it is necessary to have a sufficient cooling power, so the air conditioner cut time is set to a short time as shown in FIG. As a result, the cooling performance is prioritized over the acceleration performance, and it becomes possible to eliminate the occupant's discomfort due to the rise in the blowout temperature.

Further, according to this embodiment, the air conditioner cut time can be finely and precisely controlled, so that the cooling performance and the acceleration performance can be controlled in a well-balanced manner.

Furthermore, since the air-conditioner cut-off is not performed by shifting the ON-OFF temperature of the thermo-amplifier up to control the air-conditioner cut-off, the air-conditioner cut-off is not required, so that the suction temperature sensor becomes unnecessary and the manufacturing cost is reduced. The cost can be reduced.

FIG. 8 is a diagram showing a second embodiment of the present invention, which is applied to a so-called manual air conditioner. That is, the output signal from the voltage detection circuit 37 which detects the rotation speed of the blower fan motor 31 by the input voltage is converted into the A / D converter 3
The air-conditioner cut time calculation circuit 39 inputs through 8,
Here, when the air conditioner cut signal is input from the air conditioner cut circuit 22, the input voltage is low (the rotation speed is low).
In this case, the air conditioner cut time is set to be long, and when the input voltage is high (the rotation speed is high), the air conditioner cut time is set to be short (see FIG. 9). The air-conditioner cut time calculation circuit 39 includes an air-conditioner switch switching circuit 40.
To the air conditioner switch 41, and the circuit 40 controls the air conditioner switch 41 to be turned on and off according to the air conditioner cut time.

Therefore, also in this embodiment, when the blower motor fan voltage is low at the time of sudden acceleration of the vehicle, the air conditioner cut time is gradually increased (low, medium low, medium high, high) assuming that the cooling power is sufficient. While the acceleration performance is prioritized, when the voltage is high, it is determined that the cooling power is required, and the air-conditioner cut time is shortened stepwise to prioritize the cooling performance. Therefore, the first
The same effect as that of the embodiment can be obtained.

[0029]

As described above, according to the present invention,
If sufficient cooling force in the passenger compartment is required during sudden acceleration of the vehicle, either stop the air conditioner cut control or control the air conditioner cut time shorter than usual to ensure sufficient cooling power. Cooling performance is prioritized. Therefore, the occupant's discomfort due to the rise in the blowout temperature can be eliminated.

According to the second aspect of the invention, since the air conditioner cut time is controlled to be long or short, it is possible to control the cooling performance and the acceleration performance in a well-balanced and highly accurate manner.

[Brief description of drawings]

FIG. 1 is a diagram corresponding to a complaint.

FIG. 2 is a schematic configuration diagram showing an embodiment of an air conditioner control device according to the invention of claim 1.

FIG. 3A is an explanatory view showing a neutral temperature setting position of the variable thermoswitch used in the present embodiment, and B is FULL C0L.
It is explanatory drawing set to the D point position.

FIG. 4 is a main part configuration diagram showing a state in which an air conditioner cut signal is cut by the cutoff circuit of the present embodiment.

FIG. 5 is a first part of an air conditioner control device according to the invention of claim 2;
It is a structure schematic diagram which shows an Example.

FIG. 6 is a control block diagram of the present embodiment.

FIG. 7 is a characteristic diagram of an air conditioner cut time according to the present embodiment.

FIG. 8 is a control block diagram showing a second embodiment of the present invention.

FIG. 9 is a characteristic diagram of the air conditioner cut time of the present embodiment.

FIG. 10 is a schematic configuration diagram of a conventional air conditioner control device.

[Explanation of reference numerals] 101 compressor 102 air conditioner relay circuit 103 controller 104 thermoamplifier 105 thermoswitch 106 air conditioner cut circuit 107 disconnecting means

Claims (2)

[Claims] 1. An air conditioner relay circuit for controlling the operation of a compressor, a controller for detecting a current engine load state and outputting an ON-OFF control signal to the air conditioner relay circuit, and a thermostat for a room temperature signal set manually. An air conditioner control device for a vehicle, comprising: a variable thermoswitch for outputting to the controller via an amplifier; and an air conditioner cut circuit for temporarily outputting an air conditioner cut signal from the controller to the air conditioner relay circuit according to a high engine load condition. The variable thermoswitch and the air conditioner cut circuit are interlocked with each other, and at the predetermined cold point position of the variable thermoswitch, a shutoff means for shutting off the air conditioner cut signal output from the air conditioner cut circuit to the controller is provided. Vehicle air conditioner control device . 2. An air conditioner relay circuit for controlling the operation of a compressor, an auto amplifier for outputting an ON-OFF control signal to the air conditioner relay circuit according to a current engine load state, and an air conditioner according to an engine high load state. An air conditioner for a vehicle equipped with an air conditioner cut circuit for temporarily outputting an air conditioner cut signal from the auto amplifier to the relay circuit, and a rotation speed detection sensor for detecting the rotation speed of the blower fan motor and outputting the detection signal to the auto amplifier. In the control device, the auto amplifier is provided with a control circuit for controlling an air conditioner cut time of the air conditioner cut circuit according to a rotation speed of a blower fan motor.