JPS61193917A - Air-conditioner for vehicle - Google Patents

Abstract

PURPOSE:To prevent abrupt blow-out temperature rise immediately after turning on of compressor, by switching the output signal from a cooler temperature sensor to a fixed signal upon decision of turning off of compressor on-mode switch form turning on. CONSTITUTION:Operating means 40 will obtain signal T to decide whether a compressor is in on-mode and if it is in off mode, an output signal Tm is fed to said means 40. The operating means 40 will calculate the total signal T to control the air-mix door control means 35 thus to eliminate the difference of blow-out temperature due to switching of inner/outer air switching door 2. Upon first turning on of the compressor following to tuning on of compressor on mode switch 27, the operating means 40 will obtain the total signal T to prevent rolling of air-mix door due to cyclic drive of compressor resulting in elimination of defect for controlling the door in high temperature blow-out direction.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is directed to a vehicle air conditioner, in particular, to switch the output signal of a cooler temperature sensor and a constant fixed signal whose value does not change and output it to an air mix door control means. The present invention relates to a vehicle air conditioner that has been made possible.

[Conventional technology]

FIG. 4 is a block diagram showing an embodiment of a conventional vehicle air conditioner. In the figure, 1 is a duct, inside of which is an inside/outside air switching door 2. Blower 3, cooling 114. Air mix door5. A heater core 6 and a mode switching door 7 are arranged, and a defrost outlet 8 is disposed downstream thereof. An n-section blowing hole 91 and a foot blowing hole 10 are provided. Above cooler 4
is compressor 11. Capacitor 12. The receiver tank 13 and the expand silane valve 14 constitute a cooling cycle. The compressor 11 is to which the rotational force of the engine 15 is transmitted via the booster 1J16, and this transmission is controlled by the magnetic clutch 17. In addition, 18 is an inside air sensor that detects the temperature inside the vehicle;
19 is a potentiometer that detects the opening degree of the air mix door 5; 20 is a solar radiation sensor; 21 is an outside air sensor; 22
23 is a temperature setting device provided near the driver's dash board, and these signals are sent via an A/D converter 24 from, for example, a micro convenience store, evening etc. It is output to the control device 25 consisting of the following. Note that 26 is a fixed resistor, which will be described later, and 27 is a compressor on mode switch that is manually controlled.

The L control device 25 includes a switching circuit 28. Actuator 29
an internal/external air switching door control means 30 which controls the internal/external air switching door 2 via a compressor control means 32 which controls the magnetic clutch 17 via a magnetic clutch drive circuit 31, and a blower 3 via a blower drive circuit 33. A blower control means 34 and a drive circuit 35. an air mix door control means 35 for controlling the air mix door 5 via an actuator 36; and a switching circuit 37. A mode switching means 39 for controlling the mode switching door 7 via an actuator 38 is provided. The above-mentioned inside/outside air switching control means 30, blower control means 34, air mix door control means 35. It is controlled based on the mode switching means number T. The compressor control means 32 also includes a cooler temperature sensor 22.
The temperature of the cooler is controlled based on the output signal Tm of
When the temperature of the cooler reaches a temperature level L2, which is slightly larger than the temperature level L1, the compressor is turned on. As a result, the coblesser is driven in a cycling manner. Therefore, the compressor is driven when the compressor-on mode switch 27 is turned on, and as a result, the temperature of the cooler drops and rapid cooling M is performed, and when the temperature of the cooler reaches level Ll, the compressor is thereafter driven in cycling mode. It turns out.

The air mix door control means 35 controls the opening degree of the air mix door 5 in accordance with the magnitude of the total signal T obtained by the calculation means 40, but also controls the following In order to prevent the blowout temperature from the duct 1 from changing when the air switching door 2 is switched from outside air introduction mode to inside air introduction mode or vice versa, the opening degree of the cooler is corrected to prevent the blowout temperature from changing. I'm trying to eliminate the difference. However, such correction control is only performed when the compressor is set to off mode, and when the compressor is set to on mode, cycling drive is performed as described above, so the output of cooler temperature sensor 22 is Since the change is repeated during this cycling drive, the compressor on mode switch 27 is turned on and the compressor is placed in the on mode to control the air mix door based on the fixed signal TO from the constant resistor 26. The opening degree of the mix door does not fluctuate.

[Problem that the invention seeks to solve]

However, in the conventional vehicle air conditioner, the compressor on mode switch 27 changes to the on force signal Tm and outputs the fixed signal To, so the air mix door control means 35 controls the air mix door 5 in the high temperature blowing direction. If it is closed, warm air will be blown out, that is, if it is set to the fixed value above. Therefore, the air mix door control means 35 determines that the temperature of the cooler is already low when the compressor on mode switch 27 is turned on, and controls the air mix door 5 in the high temperature blowing direction. be.

Therefore, an object of the present invention is to obtain the output signal T of the cooler temperature sensor.
This is to prevent the blowing temperature from suddenly increasing when m is switched to the fixed signal TO.

Measures to solve problem C] When the output signal Tm of the cooler temperature sensor is set to a fixed signal TO
A determination means is provided for switching to.

[Effect]

After the compressor on mode switch is turned on, after the compressor is turned on and rapid cooling is performed, and until the compressor is turned off at temperature level L1, the air mix door control means receives the output signal of the cooler temperature sensor. Since the air mix door is supplied, the air mix door control means sets the air mix door at the regular opening degree based on this.
The blowing temperature does not become high.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of a vehicle air conditioner according to the present invention, and the same parts as in FIG. 4 are designated by the same reference numerals. In the figure, reference numeral 60 denotes a determination means, which determines that the compressor is turned off for the first time based on the output of the compressor control means 32 after the compressor on mode switch 27 is turned on, that is, at the time point P shown in FIG. The switching means 41 switches the output signal Tm of the cooler temperature sensor 22 to the fixed signal TO at time P. Therefore, it is possible to eliminate the drawback that the air mix door 5 is controlled in the high temperature blowing direction after the compressor on mode switch 27 is turned on as in the conventional case, and high temperature is blown out.

The operation of the vehicle air conditioner will be explained based on the flowchart shown in FIG. It is determined whether or not the compressor is in the on mode (step S3), and if the compressor is in the off mode, the output signal Tm is supplied to the calculation means 40, whereby the air mix door control means 35 is controlled based on the switching of the inside/outside air switching door 2. It is possible to eliminate the level difference in the blowout temperature.And, when the compressor is turned off for the first time after the compressor on mode switch 27 is turned on in step S5, the operation gas door is prevented from swinging. J4ikt Island 5 [Effects of the Invention] As explained above, according to the present invention, when it is determined that the compressor on mode switch is turned on and the compressor is turned off, the output signal Tm of the cooler temperature sensor is switched to the fixed signal TO. Since the air mix door control means 35 is controlled by the total signal obtained from this, the compressor point can be eliminated.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the vehicle air conditioner according to the present invention, FIG. 2 is a characteristic diagram for explaining the operation of the conventional vehicle air conditioner and the present invention, and FIG. A flowchart for explaining the operation of the vehicle air conditioner according to the invention, and FIG. 4 is a block diagram showing an example of a conventional vehicle air conditioner. 2... Inside/outside air switching door, 4... Cooler, 5... Air mix door, 6... Heater core, 18... Inside air sensor, 22... Cooler temperature sensor, 26... Fixed resistance, 32... Compressor control means, 35... Air mix door control means, 40... Calculation means, 41.
...Switching means, Tm...Output signal of the cooler temperature sensor, TO...Fixed signal.

Claims (1)

[Claims] When the temperature detected by a cooler that cools the air from the blower, a heater that heats the air, an air mix door that adjusts the mixing ratio of cold air and warm air, and a cooler temperature sensor falls below a predetermined value a compressor control means for stopping the compressor; an air mix door control means for controlling the air mix door by calculating at least a setting signal of the temperature setting device and an output signal of the inside air sensor; A signal from the cooler temperature sensor is input to the air mix door control means to correct the opening degree of the air mix door, and when the switch is on, a constant fixed signal that does not change in value is used to control the air mix door. and a signal switching means for preventing the air mix door from swinging based on the cycling drive of the compressor. An air conditioner for a vehicle, comprising a determining means that drives the signal switching means to enable output of the fixed signal when it is determined that the signal switching means is turned off.