JPH06106954A - Air conditioning control device for vehicle - Google Patents

Abstract

PURPOSE:To provide an air conditioning control device for a vehicle wherein an air conditioner stopped by action of an air conditioner protecting unit can be reset from an operator's cab. CONSTITUTION:A control circuit power supply 2 is connected to the first/second electromagnetic contactors 6, 8, by which a drive circuit of an air conditioner 20 is formed by closing an air conditioning operating switch 5, and to an air conditioner protecting unit 10, by which the drive circuit of the air conditioner 20 is opened at the time of generating abnormality, through a contact 24 for opening the circuit when actuated by any one of the two electromagnetic contactors 6, 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioning control device, and more particularly to protection of an air conditioner.

[0002]

2. Description of the Related Art FIG. 3 is a circuit diagram showing a conventional vehicle air conditioning control device. In the figure, 1 is an operation circuit power supply, 2
Is a control circuit power supply, 3 is a main circuit power supply, and 4 is an operation panel, which is arranged in the cab. 5 is an air conditioning operation switch, 6 is a first electromagnetic contactor, 7 is a main circuit contact of the first electromagnetic contactor 6, and 8
Is a second electromagnetic contactor, 9 is a main circuit contact of the second electromagnetic contactor 8, 10 is a compressor protection device, and 11 is a compressor protection circuit reset switch, which is generally arranged behind the vehicle ceiling. 12
Is an electromagnetic contactor for abnormality, 13 is a normally closed electromagnetic contactor for abnormality b
Contact, 14 is normally open a contact of electromagnetic contactor 12 for abnormality, 15 is overcurrent relay, 16 is normally closed contact of overcurrent relay, 17 is electromagnetic contactor for compressor, 18 is electromagnetic contactor for compressor Reference numeral 17 is a main circuit contact, 19 is an abnormal trip indicator light, 20 is an air conditioner, 21 is an indoor blower electric motor, 22 is a compressor electric motor, and 23 is a refrigerant high pressure detection switch.

Next, the operation will be described. When the air conditioning operation switch 5 is closed, the first and second electromagnetic contactors 6 and 8 are excited, the respective main circuit contacts 7 and 9 are closed, and the air conditioner 20, that is, the electric motor 21 for the indoor blower and the compressor Electric motor
22 is driven. When the air conditioner 20 is operating normally, the air conditioner protection device 10 maintains a normal state. The abnormal magnetic contactor 12 of the air conditioner protection device 10 is connected in parallel at both ends of the operation coil by a series circuit of a normally closed b contact 13 of itself, a normally closed b contact 16 of the overcurrent relay 15, and a refrigerant high pressure detection switch 23. Since it is bypassed, it is never excited. When an abnormality occurs in the air conditioner 20 and either the overcurrent relay 15 or the refrigerant high voltage detection switch 23 operates, either the normally closed b contact 13 of the abnormality electromagnetic contactor 12 or the b contact 16 or 23 in series. Is opened, and the abnormality magnetic contactor 12 is connected in series with the compressor electromagnetic contactor 17. When the abnormal electromagnetic contactor 12 is connected in series with the compressor electromagnetic contactor 17, the operating coil of the abnormal electromagnetic contactor 12 has a high impedance characteristic (about the impedance of the operating coil of the compressor electromagnetic contactor 17 9-10
Therefore, the electromagnetic contactor 12 for an abnormality is excited and the electromagnetic contactor 17 for a compressor becomes inoperable due to the difference in voltage distribution applied to both ends of each operation coil, and the main circuit contact 18
Opens. In addition, the normally closed b-contact 13 of the abnormality magnetic contactor 12
Is opened and the normally open a contact is closed, the trip state is maintained and the abnormal trip indicator lamp 19 is turned on.

[0004]

Since the conventional air conditioner protection device for an air conditioning control system for a vehicle is constructed as described above, it is compressed when either the overcurrent relay 15 or the refrigerant high pressure detection switch 23 operates. There is a problem that the compressor protection circuit reset switch 11 arranged on the ceiling of the vehicle must be operated in order to stop the compressor and restart the compressor. In addition, the air conditioner protection device can be used while the vehicle is in business.
When 10 works, there was a problem that the reset operation was impossible and it was necessary to operate the business in a state where it could not be cooled.

The present invention has been made to solve the above problems, and when the compressor protection device operates and the compressor stops, it can be reset from the driver's cab, and each vehicle of the train can be bundled together. An object is to obtain a vehicle air conditioning control device that can be reset.

[0006]

According to a first aspect of the present invention, there is provided an air conditioning control device for a vehicle, comprising: a first and a second electromagnetic contactor for forming a drive circuit of an air conditioner by turning on an air conditioning operation switch; An air conditioner protection device, which opens the drive circuit of the air conditioner when an abnormality occurs, is connected to the control circuit power supply through a contact that opens the circuit when one of the electromagnetic contactors operates. According to a second aspect of the present invention, there is provided an air conditioning control device for a vehicle, wherein the power supplies of the first and second electromagnetic contactors forming the drive circuit of the air conditioner are applied to each vehicle of a formation in which a plurality of vehicles are connected. It has been passed on.

[0007]

The vehicle air conditioning control device according to the present invention comprises:
The air conditioner stopped by the operation of the air conditioner protection device is reset by opening and closing the air conditioner operation switch installed on the cab. Further, the vehicle air conditioning control device according to the present invention collectively resets the air conditioner of each vehicle by operating the air conditioning operation switch on the cab.

[0008]

【Example】

Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. 1 is a circuit diagram showing a vehicle air conditioning control device according to a first embodiment of the present invention. In the figure, 1 to 23 are the same as the conventional ones, and therefore the description thereof is omitted. Reference numeral 24 is a normally open a contact of the first electromagnetic contactor 6 provided on the operation panel 4 in the operator's cab. The normally open a-contact 24 is connected between the control circuit power supply 2 and the air conditioner protection circuit reset switch 11.

Next, the operation will be described. In FIG. 1, the overcurrent relay 15 or the refrigerant high voltage detection switch 23 of the air conditioner protection device 10 operates, and as in the conventional case, the electromagnetic contactor 17 for the compressor is operated due to the difference in the voltage distribution across the respective operation coils. It becomes inoperable, and the compressor motor 22 stops and enters a trip state. At the same time, electromagnetic relay for abnormality
The normally open a contact 14 of 12 is closed and the abnormal trip indicator lamp 19 is turned on. To restart the stopped compressor, once open and then close the air conditioning operation switch 5 in the cab, the trip status is reset once and the abnormal trip indicator lamp 19 goes out, and the tripped normally closed b contact is closed. 16 and 23 are restored and normal operation is started.

Embodiment 2. In the first embodiment, the normally open a contact of the first electromagnetic contactor 6 is connected between the air conditioner protection circuit reset switch 12 and the control circuit power supply 2, but the second electromagnetic contactor 8 is normally open. Even if the a-contact is used, the same effect as that of the above-described embodiment is exhibited.

Embodiment 3. FIG. 2 is a circuit diagram showing a vehicle air conditioning control device according to a third embodiment of the present invention, in which the power source of the operation circuit, that is, the output side of the air conditioning operation switch 5 is passed through each vehicle of the vehicle formation and The compressor can be reset all at once, which has the effect of eliminating the operation in an uncoolable state.

[0012]

As described above, according to the present invention, when the air-conditioning operation switch is turned on, the first and second electromagnetic contactors forming the drive circuit of the air conditioner, and one of the electromagnetic contactors are operated. First and second electromagnetic contactors that connect an air conditioner protection device that opens the air conditioner drive circuit to the control circuit power supply when an abnormality occurs via a contact that opens the circuit, and also form the air conditioner drive circuit Since the power supply of the car is drawn to each car of the formation in which multiple cars are connected, the air conditioner opened by the trip of the air conditioner protection device can be reset by operating the air conditioning operation switch on the driver's cab. The effect of being able to collectively reset the air conditioners of each vehicle is obtained.

[Brief description of drawings]

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

FIG. 2 is a vehicle-to-vehicle drawing circuit diagram of a vehicle air conditioning control device according to a third embodiment of the present invention.

FIG. 3 is a circuit diagram showing a conventional vehicle air conditioning control device.

[Explanation of symbols]

 5 Air conditioning operation switch 6 First magnetic contactor 8 Second electromagnetic contactor 10 Air conditioner protection device 11 Air conditioner protection device reset switch 20 Air conditioner 24 Magnetic contactor normally open a contact

Claims (2)

[Claims] 1. A circuit is opened when the first and second electromagnetic contactors that form a drive circuit of the air conditioner when the air conditioning operation switch is turned on and one of the electromagnetic contactors are operated. An air conditioning control device for a vehicle, wherein an air conditioner protection device that opens a drive circuit of the air conditioner when an abnormality occurs is connected to a control circuit power supply via a contact. 2. The power supply for the first and second electromagnetic contactors forming the drive circuit of the air conditioner is passed through each vehicle of the formation in which a plurality of both are connected. Vehicle air conditioning control device.