JPS5811608Y2 - Automotive air conditioning control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioning control device for an automobile, and particularly to an improvement in a device that automatically controls temperature.

Conventional automatic temperature control devices used in automobile air conditioners either control the position of a damper installed in the ventilation passage or control the opening of a hot water flow regulating valve to change the mixing ratio of cold air and warm air. An electric power control system or a pneumatic control system using a diaphragm or the like was used to control the position of the damper or the opening of the hot water volume regulating valve.

In pneumatic control devices using diaphragms, in order to convert electrical signals into pneumatic signals, the balance between the atmosphere and the output air pressure is used by a specially structured bellows and needle, or the balance between an electromagnet and the output air pressure is used. thing,
Alternatively, two solenoid valves were used to open and close an air circuit leading to the air pressure source and the atmosphere.
All force-balanced transducers had a special structure and were expensive, and required an electrical signal to generate a force proportional to the output air pressure, making the amplifiers complex and expensive.

In addition, converters using two solenoid valves require two solenoid valves and two output signals from the amplifier, making the amplifier structure complex and expensive. .

Furthermore, in order to eliminate the above defects, one independent solenoid valve is driven by the output signal of the amplifier, and the output air pressure of the solenoid valve operates the pneumatic actuation mechanism, and the pressure transmission to the pneumatic actuation mechanism is delayed. Therefore, in a configuration in which a restriction is provided in the air circuit that connects the output port of the solenoid valve and the pneumatic actuation mechanism, when the solenoid valve is suddenly operated to a position opposite to the damper position when the solenoid valve is not driven, Since a restriction is provided in the air circuit connecting the output port and the pneumatic actuation mechanism, pressure fluctuations become gradual, resulting in a drawback that it takes time to operate the damper.

The purpose of this invention is to improve the above-mentioned device that is controlled by one independent solenoid valve, and changes the transmission speed of pressure fluctuations transmitted from the output port of the solenoid valve to the pneumatic actuation mechanism according to the control operation. This feature is characterized in that the air mix damper is quickly controlled by controlling the air mix damper.

The present invention will be explained below with reference to drawings showing embodiments.

Reference numeral 1 denotes a temperature setting device, which in this embodiment is composed of a variable resistor, and detects the stop position of the temperature detection device 2 and the air mix damper, which is composed of a vehicle interior temperature detection sensor 2a, an outside temperature detection sensor 2b, etc. The position detection device 8 is connected in series.

The connection point between the temperature setting device 1 and the temperature detection device 2 is connected to the non-inverting input terminal 3a of the amplifier 3, and
A reference voltage distributed by resistors R1 and R2 is applied to the 0-inverting input terminal 3b.

Further, the output terminal 3c of the amplifier 3 is connected to the base of a transistor 9 via a resistor R3, and the collector of the transistor 9 is connected to the positive pole of the power source via the excitation coil 4a of the electromagnetic valve 4.

The solenoid valve 4 is a three-way solenoid valve, and a diaphragm actuator constituting a pneumatic actuating mechanism 5 is connected to the output port 4b, and one input port 4C of the two input ports 4c and 4d is connected to a pneumatic source (not shown). When the solenoid valve 4 is not driven, the input port 4d, which is open to atmospheric pressure, and the output port 4b communicate with each other.

An air mix damper 6 disposed on the front surface of the air inflow side of the heating heat exchanger 10 as a controlled object 6 is connected to the operating axis 5a of the actuator 5, and the air mix damper 6 is connected to the operating axis 5a of the actuator 5. The damper 6 is moved by the operation of the moving shaft 5a to control the inflow opening area of the air passing through the heating heat exchanger 10.

Here, an input port 4 connected to the air pressure source of the solenoid valve 4
In addition, the input port 4d, which is open to atmospheric pressure, is provided with a throttle 7a with a small throttle amount, and the input port 4d, which is open to atmospheric pressure, has a throttle 7b with a large throttle amount. I have it.

In addition, 11 in the figure is a motor for driving the blower, and 12 is the motor for driving the evaporator.
and one that forcibly introduces air into the ventilation passage containing the heating heat exchanger 10 and sends out conditioned air, which is a mix of cold air and warm air that have passed through the evaporator 12 and the heating heat exchanger 10, into the vehicle interior. It is.

To explain the operation of the present invention configured as described above, air is introduced into the ventilation passage by the drive of the blower drive motor 10, and the cold air and warm air that have passed through the evaporator 12 and the heating heat exchanger 10 are mixed. Minx conditioned air is sent into the vehicle interior, but as the temperature detected by the vehicle interior temperature detection sensor 2a of the temperature detection device 2 decreases, the resistance value of the vehicle interior temperature detection sensor 2a increases and the amplifier 3 The non-inverting input terminal 3a voltage becomes higher than the inverting input terminal 3b voltage, the output terminal 3c voltage becomes high level, the base potential of the transistor 80 rises, and the transistor 8 becomes conductive.

Therefore, the solenoid valve 4 operates and the output port 4b and the input port 4C connected to the air pressure source communicate with each other.
Negative pressure is applied to the output port 4b from a pneumatic source connected to the input port 4c, and the operating shaft 5a of the pneumatic actuating mechanism 5 is pushed down against the reaction force of the spring 5b.

By moving the operating axis 5a downward, the operating axis 5a
The damper 6 connected to the position detector 8 also moves downward, increasing the amount of air passing through the heating heat exchanger 10 and raising the temperature of the air blown into the vehicle interior. Since the actuator 5 operates to reduce the resistance value by moving the operating shaft 5a of the actuator 5 downward, the transistor 9 is made non-conductive to stop the operation of the solenoid valve 4 and to suppress the amount of movement of the damper 6. This works to send out appropriate conditioned air into the vehicle interior.

Furthermore, as the temperature detected by the vehicle interior temperature detection sensor 2a increases, the resistance value of the vehicle interior temperature detection sensor 2a decreases, so the voltage at the non-inverting input terminal 3a of the amplifier 3 decreases, so the voltage at the output terminal 3C is at a low level. Therefore, the transistor 9 becomes non-conductive.

Therefore, the solenoid valve 4 stops operating, and the output port 4b communicates with the input port 4d on the atmospheric pressure release side, so the negative pressure applied to the output port 4b side decreases, and the operating shaft 5a of the actuator 5 is moved by the spring 5b. The reaction force moves the damper 6 in the direction of reducing the air inflow opening area of the heating heat exchanger 10, so the air passing through the heating heat exchanger 10 decreases, so the temperature of the air blown into the vehicle interior decreases. Although the resistance value of the variable resistor constituting the position detection device 8 decreases, the resistance value of the variable resistor increases as the operating axis 5a of the actuator 5 moves upward. The control device becomes conductive and operates the solenoid valve 4 to push the damper 6 downward, thereby sending out appropriate conditioned air into the vehicle interior.

The above-mentioned operations are repeated to control the vehicle interior air temperature to the set temperature.
, 7b are formed, so when the input port 4c connected to the pneumatic pressure source and the output port 4b are connected to each other, the pressure fluctuation can be quickly suppressed by the pneumatic pressure because the amount of restriction of the restriction 7a formed in the input port 4c is small. The transmission is transmitted to the mechanism 5 to quickly move the damper 6 to a predetermined position, and when the output capo (4b) is linked to the input capo (4d) opened to atmospheric pressure, the throttle formed at the input port (4d) is Since the amount of restriction of the damper 7b is large, the pressure fluctuation is gentle, and the movement of the damper 6 is slow, so that sudden temperature changes due to the movement of the damper 6 can be avoided.

Now, to explain the output negative pressure fluctuation of the solenoid valve with reference to Fig. 2, as shown in Fig. 2a, the output negative pressure fluctuation of the conventional solenoid valve is divided into The relationship between the amount of pressure fluctuation is the same as the change that occurs in the negative pressure fluctuation differential △p to maintain the damper at a predetermined position, that is, the fluctuation when the solenoid valve is stopped and in operation. As shown, in the present invention, the travel time t for the damper to a predetermined position is shortened, and the subsequent negative pressure fluctuations are gradual when the solenoid valve is stopped and quick when it is in operation, so that the intermittent cycle of the solenoid valve is reduced. t1 is long and the operating time Δt2 is short.

As described above, the present invention provides an air conditioner in which temperature is controlled by controlling the opening position of a damper. The throttle is shaped to give a difference in the transmission time of pressure fluctuations, so when negative pressure is introduced, the pneumatic actuating mechanism can start up quickly, reducing the time it takes for the damper to reach the specified position. Eliminates discomfort caused by cold air blowing due to delayed operation.
This allows for comfortable temperature control.

In addition, by creating a difference in pressure transmission, the intermittent cycle of the solenoid valve can be lengthened, reducing the number of times the solenoid valve operates, improving the durability of the solenoid valve, and reducing power consumption by shortening the operating time of the solenoid valve. This is something to look forward to.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of the main parts of a control device showing an embodiment of the present invention;
FIG. 2 is an explanatory diagram showing the time fluctuation of the output negative pressure of the solenoid valve, in which a is a diagram showing a conventional example and b is a diagram showing the present invention. 1...Temperature setting device, 2...Temperature detection device, 3...Amplifier, 4...Solenoid valve,
5...Pneumatic actuation mechanism, 6...Damper, 7...Aperture.

Claims (1)

[Scope of utility model registration request] An air conditioning control device that controls an air conditioning device using an air pressure control device includes at least a temperature detection device, a temperature setting device, an amplifier whose input signals are signals from the temperature detection device and the temperature setting device, and an output of the amplifier. A plurality of electromagnetic valves constituting the electro-pneumatic conversion device, comprising a solenoid valve constituting the electro-pneumatic conversion device operated by a signal and a pneumatic actuation mechanism actuated in response to the output pressure of the electro-pneumatic conversion device. 1. An air conditioning control device for an automobile, characterized in that each input port is provided with apertures having different amounts of aperture, thereby creating a difference in pressure transmission speed.