JPH051524U - Car air conditioner - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to prevent the air compressor from being repeatedly activated and deactivated, improve its durability, and stabilize the idling operation of the vehicle and improve the driving feeling. Providing car air conditioners. [Arrangement] Via an air conditioner switch 1 that is manually operated, a pressure switch 2 that is turned on / off according to the state of the refrigerant such as temperature and pressure, and an air conditioner relay 3 that is on / off controlled by an EGI control unit 5. In the car air conditioner in which the air compressor 4 is configured as a power supply circuit, the EGI control unit 5 includes the air compressor 4
A car air conditioner configured to keep the air conditioner relay 3 in the off state for a predetermined time after the stop of the operation.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a car air conditioner installed in a vehicle, and more particularly, to a car air conditioner in which an air compressor is prevented from frequently repeating operation and non-operation.

[0002]

[Prior Art]

 Some air compressors for car air conditioners are energized and controlled by an air conditioner ECU as described in Japanese Patent Application Laid-Open No. 1-216037, but in general, an air conditioner relay, a pressure switch and an air conditioner switch that are directly connected to each other are used. It is connected to the power supply via the air compressor. When all of these switches are turned on, the air compressor operates, and when any of the switches is turned off, the air compressor stops operating.

Here, the pressure switch is turned on / off according to the pressure of the refrigerant, and the air conditioner relay is controlled by the EGI control unit so as to be turned off when the vehicle is accelerated.

[0004]

[Problems to be solved by the device]

 By the way, in a car air conditioner equipped with the pressure switch described above, when the outside air temperature is relatively low and the pressure of the refrigerant is in the vicinity of the on / off switching point of the pressure switch, the pressure switch operates, for example, 2-3 times per minute. May frequently be turned on and off repeatedly. For this reason, if the air conditioner switch is turned on under such a condition, the air compressor will be repeatedly activated and deactivated, reducing its durability and making the idling operation of the vehicle unstable or running. There was a problem such as feeling loss.

Therefore, the present invention can improve the durability of the air compressor by preventing frequent operation and non-operation of the air compressor, and stabilize the idling operation of the vehicle and improve the driving feeling. The purpose is to provide a car air conditioner that can.

[0006]

[Means for Solving the Problems]

 To this end, the present invention provides an air conditioner switch that is manually operated, a pressure switch that is turned on and off according to the temperature and pressure of the refrigerant, and an air conditioner relay that is turned on and off by an EGI control unit. In a car air conditioner in which an air compressor is used as a power supply circuit, the EGI control unit is configured to keep the air conditioner relay off for a predetermined time after the air compressor stops operating.

[0007]

[Action]

 By adopting such means, the air compressor operates by energizing all of the air conditioner switch, pressure switch, and air conditioner relay, and deenergizing by turning off any of them. To stop. Then, once the power is turned off and the air compressor stops operating, the EGI control unit controls the air conditioner relay to remain off for a predetermined time after the air compressor stops operating. Therefore, even when the pressure switch is repeatedly turned on and off within a short period of time, the air compressor is in a deactivated state for a predetermined time, and after the predetermined time elapses, the air compressor can be energized again to be operated.

That is, the air compressor is prevented from being repeatedly operated and deactivated in a short time, and its durability is improved. A vehicle equipped with such an air compressor stabilizes the idling operation and improves the driving feeling.

[0009]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a drive circuit of an air compressor of a car air conditioner to which an embodiment is applied. In the figure, reference numeral 1 is an air conditioner switch, reference numeral 2 is a pressure switch, reference numeral 3 is an air conditioner relay, and reference numeral 4 is an air compressor. , Reference numeral 5 indicates an EGI control unit, respectively.

The air compressor 4 is configured as a power source through the normally open relay contact 3a of the air conditioner relay 3, the pressure switch 2, and the air conditioner switch 1, and operates when all of these switches are turned on. The circuit is configured to

The air conditioner switch 1 is arranged on an instrument panel of a vehicle and is manually turned on and off. Further, the pressure switch 2 is turned on / off in response to a change in the pressure of the refrigerant, and is turned on when the refrigerant pressure is below a predetermined value and turned off when the refrigerant pressure is above the predetermined value. The pressure switch 2 can be changed to a thermal switch or a thermo switch that is turned on / off according to the temperature change of the refrigerant.

The air conditioner relay 3 has a relay coil 3b, one end of which is connected to a power source and the other end of which is grounded to the chassis via the EGI control unit 5, and which corresponds to an output signal of the EGI control unit 5. The relay contact 3a is adapted to be turned on and off. The voltage at the point A between the pressure switch 2 and the air conditioner relay 3 is input as a signal to the EGI control unit 5, and the signal from the throttle opening sensor 6 is also input.

FIG. 2 shows a block configuration of the EGI control unit 5, in which a signal is input from the throttle opening sensor 6 to determine acceleration time from the rate of change, and when it is determined to be acceleration time, An air conditioner cut control unit 7 for turning off the power supply to the relay coil 3b is provided. Here, the EGI control unit 5 uses the voltage signal at the point A and ON / OFF of the energization of the relay coil 3b as input signals to turn off the energization of the relay coil 3b for a predetermined time after the operation of the air compressor 4 is stopped. An air-conditioner suspension control unit 8 that holds the data is provided.

The air conditioner suspension control unit 8 determines whether the air compressor 4 needs to be driven or not, depending on whether the voltage signal at the point A is at H level or L level, and an air compressor drive determination unit 8a and a relay coil 3b. An air conditioner relay monitor section 8b that determines the on / off state of the air conditioner relay according to the on / off signal of the energization, and a timer section 8c that inputs signals from the air conditioner press drive determination section 8a and the air conditioner relay monitor section 8b. A relay coil energization control unit 8d is provided for ON / OFF controlling the energization of the relay coil 3b according to the output signal of the timer unit 8c.

When the drive unnecessary signal is input from the air compressor drive determination unit 8a, the timer unit 8c measures the elapsed time from the input, that is, from the operation stop of the air compressor 4. Further, when the timer unit 8c inputs the drive required signal from the air compressor drive determination unit 8a and the air conditioner relay OFF signal from the air conditioner relay monitor unit 8b, the relay coil is detected when the measured elapsed time exceeds the predetermined time. An ON signal is output to the energization control unit 8d. When a drive required signal is input from the air compressor drive determination unit 8a and an air conditioner relay ON signal is input from the air conditioner relay monitor unit 8b, an ON signal is immediately output to the relay coil energization control unit 8d.

Next, the operation of the car air conditioner of the embodiment thus configured will be described based on the flow chart of FIG. 3 and the time chart of FIG. First, when the control of the air conditioner suspension control unit 8 is started, the air compressor drive determination unit 8a determines whether the point A signal is at H level or L level (S1). If the air conditioner switch 1 is off, the signal at point A is at L level, and the air conditioner drive drive determination unit 8a outputs a drive unnecessary signal for the air compressor 4. Therefore, the timer unit 8c outputs the drive unnecessary signal. The elapsed time from the input of is measured (S2). Then, in this case, the ON signal is not output to the relay coil energization control unit 8d, the air conditioner relay 3 remains OFF (S3), and the air compressor 4 is held in the inoperative state.

Here, when the air conditioner switch 1 is turned on, the A point signal becomes H level. Then, in this case, the air conditioner relay 3 determines whether the air conditioner relay 3 is on or off in the next step S4, and if it is off, the process proceeds to step S5. In step S5, the timer unit 8c compares the measured elapsed time with the predetermined time set to, for example, 1 minute. Then, if the elapsed time is within 1 minute, the process goes to step S2 to continue measuring the elapsed time, and after 1 minute, the measured value of the elapsed time is reset (S6), and the ON signal is sent to the relay coil energization control unit 8d. It is output. Then, the relay coil 3b is energized and the relay contact 3a is closed to turn on the air control relay 3 (S7). On the other hand, if the result of the determination in step S4 is ON, the process jumps to step S6 and the air conditioner relay 3 is immediately turned on (S7). Then, when the air conditioner relay 3 is turned on, the air compressor 4 starts operating.

When the air conditioner switch 1 or the pressure switch 2 is turned off, the operation of the air compressor 4 is stopped, but the signal A point becomes L level, so that the air conditioner suspension control unit 8 steps from step S1 to step S2. The control proceeds to S3, the timer unit 8c measures the elapsed time from the operation stop of the air compressor 4, and the output of the ON signal to the relay coil energization control unit 8d is stopped, so that the air conditioner relay 3 is turned on. Turned off.

When any of the air conditioner switch 1, the pressure switch 2, and the air conditioner relay 3 is turned off, the air compressor 4 stops operating. At that time, in step S3 of the control flow of the air conditioner suspension control unit 8. Air conditioner relay 3 is also turned off. Therefore, even if both the air conditioner switch 1 and the pressure switch 2 are turned on, the control proceeds from step S1 to step S4, step S5, step S2, and step S3, and the air compressor 4 uses the timer. After a predetermined time set in the section 8c has elapsed, the operation state is restored.

Since such control is executed in the air conditioner suspension control unit 8 of the EGI control unit 5, the outside air temperature is relatively low, and the refrigerant pressure is near the on / off switching point of the pressure switch 2. Therefore, even if the pressure switch 2 is frequently turned on and off at a rate of 2 to 3 times per minute, the air compressor 4 must pass a predetermined time set to, for example, 1 minute after the operation is stopped. If it does not return to the operating state again.

Therefore, the air compressor 4 is prevented from being repeatedly operated and deactivated frequently in a short time, and its durability is improved. In a vehicle equipped with such an air conditioner pressurizer, the air compressor 4 does not frequently operate and deactivate and the engine load does not fluctuate, which stabilizes the idling operation and improves the driving feeling. To do.

[0022]

[Effect of the device]

 As described above, according to the present invention, the air compressor operates by energizing all of the air conditioner switch, pressure switch, and air conditioner relay, and deenergizing by turning off any of them. To stop. Then, once the power is turned off and the air compressor stops operating, the EGI control unit controls the air conditioner relay to remain off for a predetermined time after the air compressor stops operating. Therefore, even when the pressure switch repeatedly turns on and off within a short time, the air compressor remains inactive for a predetermined period of time, and after the predetermined period of time has passed, the air compressor can be energized again to operate. ..

That is, it is possible to prevent the air compressor from repeatedly operating and not operating in a short time, and improve its durability. Then, it is possible to stabilize the idling operation of the vehicle equipped with such an air compressor and improve the driving feeling.

[Brief description of drawings]

FIG. 1 is a drive circuit diagram of a compressor according to an embodiment of the present invention.

FIG. 2 is a block diagram of an EGI control unit according to an embodiment.

FIG. 3 is a flowchart illustrating the operation of one embodiment.

FIG. 4 is a time chart explaining the operation of the embodiment.

[Explanation of symbols]

 1 Air conditioner switch 2 Pressure switch 3 Air conditioner relay 3a Relay contact 3b Relay coil 4 Air compressor 5 EGI control unit 6 Throttle opening sensor 7 Air conditioner cut control unit 8 Air conditioner pause control unit 8a Air compressor drive determination unit 8b Air conditioner relay monitor unit 8c Timer 8d Relay coil energization controller

Claims (1)

[Claims for utility model registration] [Claim 1] An artificially operated air conditioner switch,
In the car air conditioner in which the air compressor is configured as a power source through a pressure switch that is turned on / off according to the state of the refrigerant temperature or pressure, and an air conditioner relay that is on / off controlled by the EGI control unit, the EGI control is performed. The unit is a car air conditioner characterized in that the air conditioner relay is kept in an off state for a predetermined time after the operation of the air compressor is stopped.