JP3029566B2 - Vehicle air conditioning controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention, in order to control the evaporator outlet temperature in the vehicle air conditioning system, con
The present invention relates to an air conditioning control device for a vehicle that controls an on / off signal of a presser .

[0002]

2. Description of the Related Art In general, an air conditioner for a vehicle has a type in which a variable resistor for adjusting the temperature of an evaporator outlet is mounted, and there is no such a variable resistor. There are two types: a type that adjusts the temperature by changing the ratio of warm wind with a mechanical lever. Conventionally, for such two types of vehicle air conditioners, separate control devices, that is, a control device having a circuit originally provided with a variable resistor, and a fixed device having no variable resistor are provided. A control device having a circuit provided with a resistor has been used.

[0003]

However, when separate control devices are used for the evaporator air outlet temperature variable type and the evaporator air outlet temperature fixed type vehicular air conditioners as described above, a common control device is used. Therefore, there is a problem that the manufacturing and assembling steps of the control device become complicated, and the control device must be selected according to the type, so that attention must be paid to the management of the assembling process.

The present invention focuses on such a problem, and uses a common control device for the above two types of vehicle air conditioners, and within the common control device, the two types of vehicle air conditioners. It is an object of the present invention to automatically select a circuit conforming to the above.

[0005]

According to the present invention, there is provided a vehicle air conditioner control apparatus which outputs a signal for turning on or off a compressor of a vehicle air conditioner to an evaporator outlet.
A signal from a thermistor for temperature detection and a circuit with a resistor
The signal from the road is compared with a comparator (4) (shown in FIG. 1).
The vehicular air conditioning control apparatus having a circuit for outputting the Rukoto, in circuit with the resistance of the compressor on and off signal output control circuit is provided with a variable resistor of the evaporator outlet temperature adjusting detachably And a circuit including the resistor according to the state of attachment and detachment of the variable resistor.
From the comparator to the comparator (4) through a variable resistor
The signal to be determined and the resistance are provided without passing through a variable resistor.
Signal determined through a fixed resistor provided in the circuit
And a determination / switching circuit for automatically switching between them.

[0006] The determination and switching circuits, for example, comparing means for comparing the voltage signal with a reference voltage from a connection end of the variable resistor, based on the output signal from said comparing means, said
A signal from the circuit having a resistor to the comparator (4) is
The signal determined through the variable resistor and the
Without passing through a fixed resistor provided in a circuit having the resistor.
And a driving means for switching to a signal determined by

[0007]

[Action] In such a vehicular air conditioning control device, determine <br/> constant-switching circuit, if the variable resistor is provided in the circuit, a case where the variable resistor is removed, Signals automatically determined and sent to the comparator (4)
Is automatically switched. Therefore, if a variable resistor is provided, a circuit using the variable resistor determines the temperature detected by the thermistor at which the compressor is turned on or off, and is suitable for a vehicle air conditioner of a variable evaporator outlet temperature type. The output signal is output. When the variable resistor is removed, the solid thermistor detection temperature for turning on or off the compressor in circuit using a constant resistance is fixed, matched signal outputted to the vehicle air-conditioning system evaporator outlet temperature fixed type Is done. Since these are automatically determined, selected and switched , even a single type of control device can be used in common for vehicle air conditioners of the evaporator air outlet temperature variable type and the evaporator air outlet temperature fixed type. Becomes

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a vehicle air-conditioning control device according to the present invention will be described below with reference to the drawings. FIG. 1 shows a main part of a circuit of a vehicle air-conditioning control device according to one embodiment of the present invention. In the figure, reference numeral 1 denotes a thermistor for detecting an evaporator outlet temperature, and 2 denotes a fixed resistor. The signal from the thermistor 1 and the signal from the evaporator outlet temperature setting unit 3 are compared by a comparator (operational amplifier) 4, and the output is output as a compressor on or off signal 5.

In the evaporator outlet temperature setting section 3, a variable resistor 8 (VR) is detachably provided between a fixed resistor 6 (R ₁ ) and a fixed resistor 7 (R ₂ ). The voltage between the variable resistor 8 (VR) and the fixed resistor 6 (R ₁ ) is input to the comparator 4, and the resistor 6 (R ₁ ) and the variable resistor 8 (V
R) and the resistor 7 (R ₂ ) constitute a circuit for varying the evaporator outlet temperature. The comparator 9 serving as a comparison means includes a voltage signal from one end of the fixed resistor 7 (R ₂ ) (a connection end of the variable resistor 8), a fixed resistor 10 (R ₄ ) and a fixed resistor 11 (R ₅ ). And the signal of the reference voltage V ₀ divided by the resistor. When the variable resistor 8 (VR) is connected, a low-level signal is output from the comparator 9, and when the variable resistor 8 (VR) is removed, the output is inverted. High and that Hi
gh level signals are output.

The comparator 9 is connected to a transistor 12 as switching means (driving means).
To the gate on or off. When the signal from the comparator 9 is at a low level, the transistor 12 does not conduct, and when the signal is at a high level, the transistor 12 conducts. This transistor 12, the fixed resistor 6 (R ₁₎ a fixed resistor 13 (R ₃₎ is connected between the fixed resistor 6 (R ₁₎ and a fixed resistor 13 (R ₃₎
Series circuit constitutes a circuit for fixing the evaporator outlet temperature.

In the above embodiment, the comparator 9 is constituted by an operational amplifier. However, the comparator 9 can be constituted by using a CPU or a photocoupler.

In the device configured as described above,
In the case of the vehicle air conditioner of the evaporator outlet temperature variable type, the variable resistor 8 (VR) is connected. The potential between the variable resistor 8 (VR) and the fixed resistor 7 (R ₂ ) is sent to the comparator 9 as a voltage signal.
Since a low level signal is output, the transistor 12
Are not conducted (not turned on). Therefore, as shown in FIG. 2, the fixed resistor 6 (R ₁ ) and the variable resistor 8 (V
R) is input to the comparator 4 as a voltage signal. In other words, the compressor on / off signal is
And the signal from the thermistor 1 for over data outlet temperature detection knowledge, mosquitoes
The signal from the circuit having each resistor including the variable resistor 8 (VR)
The signal is output by comparing the signal with a comparator (4).
By changing the setting of the variable resistor 8 (VR),
The input potential to the comparator (4) changes, and the thermistor for turning the compressor on or off correspondingly.
1 also changes. As a result, the outlet temperature of the evaporator is maintained at a temperature according to the variable resistor 8 (VR).

On the other hand, in the case of the vehicle air conditioner of the evaporator outlet temperature fixed type, the variable resistor 8 (VR) is removed. The comparator 9 outputs H based on the reference voltage V _0.
A high-level signal is output, and the transistor 12 is turned on. As a result, as shown in FIG. 3, the fixed resistor 6 (R
₁ ) and a fixed resistor 13 (R ₃ ) are connected in series, and the potential between both resistors is input to the comparator 4 as a voltage signal. Since the resistance values of both resistors 6 and 13 are fixed,
The temperature detected by the thermistor for turning the compressor on or off is fixed, and the evaporator outlet temperature is maintained at a certain temperature.

[0014] Thus, installation of the variable resistor 8 (VR), in accordance with the removal, automatically switching with the evaporator outlet temperature adjustable type circuit and the evaporator outlet temperature fixing type circuit is automatically determined, Selected. Therefore, although it is a kind of control device, it can be common to both types of vehicle air conditioners.

[0015]

As described above, according to the vehicle air conditioning control device of the present invention, the presence or absence of a variable resistor is automatically determined in the control device, and based on the determination, the evaporator air outlet temperature can be varied. The circuit for the vehicle air conditioner of the fixed type and the evaporator outlet temperature fixed type is automatically switched and selected, respectively, so it is a kind of control device, but it is common to both types of vehicle air conditioners. And can be. As a result, the manufacture of the vehicle air conditioning controller itself,
The assembly is facilitated, and the process control when assembling the same is also facilitated.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a main part of a vehicle air conditioning control device according to one embodiment of the present invention.

FIG. 2 is a partial circuit diagram showing one state of the circuit of FIG. 1;

FIG. 3 is a partial circuit diagram showing another state of the circuit of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Thermistor 2 Fixed resistance 3 Evaporator outlet temperature setting part 4 Comparator 5 Compressor ON / OFF signal 6, 7, 10, 11, 13 Fixed resistance 8 Variable resistor 9 Comparator as comparison means 12 Transistor as drive means

Claims (2)

(57) [Claims] 1. A signal for turning on or off a compressor of a vehicle air conditioner is detected by detecting an evaporator outlet temperature.
Signal from the thermistor for
Times to output by comparing the signal by the comparator (4)
The vehicular air conditioning control apparatus having a road, the complexone
With the resistance of the signal output control circuit for Ssaon off
A circuit, a variable resistor of the evaporator outlet temperature adjustment with freely provided detachably, a detachment state of the variable resistor
Accordingly, from the circuit including the resistor to the comparator (4)
Signal is determined by a variable resistor
A fixed part provided in a circuit provided with the resistor without passing through the resistor
An air-conditioning control device for a vehicle, comprising: a determination / switching circuit for automatically switching to a signal determined through a constant resistance . Wherein said determination and switching circuit includes a comparing means for comparing the voltage signal with a reference voltage from a connection end of the variable resistor, based on the output signal from said comparing means, said resistor
From the circuit provided with the comparator (4) to the variable resistor.
The signal determined through the resistor and the variable resistor
A decision is made through a fixed resistor provided in a circuit having the resistor.
Driving means for switching to a predetermined signal .
The vehicle air conditioning control device according to claim 1.