JP3351275B2 - Automotive air conditioners - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for an automobile having an electric compressor driving device for driving an electric compressor with a DC power source such as a battery.

[0002]

2. Description of the Related Art In an automotive air conditioner equipped with an electric compressor driving device for driving an air-conditioning electric compressor with DC power, the electric compressor driving device for driving the air-conditioning electric compressor supplies a large current to the electric compressor. As a result, the electrical noise is large and interferes with the on-vehicle radio and the like, and a large current fluctuation causes a voltage surge to cause damage to related equipment.

Therefore, as shown in the current waveform diagram of FIG.
It is necessary to smooth the power supplied from the battery with a capacitor to suppress electric noise and current fluctuation.

[0005] For this reason, as shown in the conventional automobile air conditioner diagram of FIG. 5, a capacitor 3 having a large capacitance for smoothing a current is provided between a battery 1 as a DC power supply and an electric compressor driving device 4. Is provided.

An electric compressor 5 is connected to the electric compressor driving device 4 by a connector 19, and the battery 1 and the electric compressor driving device 4 are connected to each other by the connector 1.
1 and a fuse 6 for circuit protection is provided in the middle part.

Further, a charging resistor 9 for charging the capacitor 3 (= conducting device), a voltage detecting circuit 15 for detecting a charging voltage of the capacitor 3, and a relay for supplying electric power from the battery 1 to the electric compressor driving device 4. 8 (=
A control circuit 10 for operating the switching device, the relay 8 and the electric compressor driving device 4 is also provided.

The diode 12 is provided so that the capacitor 3 will not be charged and the circuit will not be damaged even if the battery 1 as a DC power supply is connected in reverse polarity.

The relay 8 is closed by the control circuit 10 after the voltage detection circuit 15 confirms the completion of charging of the capacitor 3.

[0009]

In the above-described conventional case, there is no means for detecting even if the connector 19 is not connected. Therefore, the electric compressor 5 does not operate,
It is mistaken as a failure of the electric compressor drive device 4.

Further, if the connector is left unconnected, the connector may be deteriorated. On the other hand, the electric compressor driving device 4 operates and keeps outputting the voltage to the connector 19. When the connector 11 is not connected, the voltage of the battery 1 remains exposed.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an air conditioner for a vehicle which detects disconnection of a connector, thereby preventing exposure of voltage, improving serviceability, and preventing deterioration of the connector. is there.

[0012]

According to the present invention, there is provided a charge detecting device for detecting a charging current flowing through a charging device and transmitting a current signal to a control device. Before operating the device, the electric compressor drive device is operated, and if the current signal is not transmitted from the charge detection device, it is determined that the electrical connection is open,
Do not operate the switchgear and electric compressor drive.

[0013]

According to the present invention, when a power connector or a compressor connector is not connected,
Even when the electric compressor driving device is operated, no current flows through the charging device because the current path is interrupted.

Therefore, since the current signal is not transmitted from the charging detection device, it is determined that the electric connection portion is open (the disconnection of the connector can be detected), and the opening / closing device and the electric compressor driving device are not operated.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

FIG. 1 is a circuit diagram of a vehicle air conditioner according to a first embodiment of the present invention. The difference from the circuit diagram of the conventional automotive air conditioner of FIG. 5 is that the charging current detection circuit 14 is connected in parallel with the charging resistor 9, the output of the charging current detection circuit 14 is connected to the control circuit 10, and the voltage detection is performed. The point is that there is no circuit 15.

Here, it is assumed that both the connector 11 and the connector 19 are normally connected. The control circuit 10 operates the electric compressor driving device 4 while keeping the relay 8 open. At this time, current flows from the battery 1 to the fuse 6, the connector 11, the diode 12, the charging resistor 9, the electric compressor driving device 4, the connector 19, and the electric compressor 5.

Therefore, the current flows through the charging resistor 9 to generate a voltage. With this voltage, L of the charging current detection circuit 14
The ED is turned on, the phototransistor is turned on, and the voltage of the control circuit power supply 7 is transmitted to the control circuit 10.

Therefore, the control circuit 10 controls the connector 1
1. It is determined that both connectors 19 are normally connected, and the process proceeds to the next step. Once, the electric compressor driving device 4 is stopped, the relay 8 is closed, and the electric compressor driving device 4 is operated.

Here, it is assumed that the connector 19 is not connected. The control circuit 10 operates the electric compressor driving device 4 while keeping the relay 8 open. At this time, the electric compressor drive 4, connector 19, electric compressor 5
No current flows to

Therefore, no current flows through the charging resistor 9 and no voltage is generated. The LED of the charging current detection circuit 14 does not light up, and the phototransistor remains off.
The voltage of the control circuit power supply 7 is not transmitted to the control circuit 10.

Therefore, the control circuit 10 controls the connector 1
1. It is determined that any one of the connectors 19 is not connected, the electric compressor driving device 4 is stopped, and the relay 8 is kept open.

Therefore, no voltage is exposed on the connector 19. FIG. 2 shows a circuit diagram of an automotive air conditioner according to a second embodiment of the present invention.

The difference from the circuit diagram of the automotive air conditioner according to the first embodiment of the present invention shown in FIG. 1 is that an air conditioner controller 16 and an operation unit 17 are added.

The determination of whether a connector is not connected is the same as in the first embodiment. When it is determined that the connector is not connected, the control circuit 10 transmits a signal indicating that the connector is not connected to the air conditioner controller 16.

Then, the air conditioner controller 16 instructs the operation unit 17 to issue an alarm indicating that the connector is not connected. This allows the user to know that the connector is not connected. The information can be variously conceived such as a screen display and a sound.

Therefore, the serviceability can be improved. FIG. 3 shows a circuit diagram of a vehicle air conditioner according to a third embodiment of the present invention.

The difference from the circuit diagram of the vehicle air conditioner according to the first embodiment of the present invention shown in FIG. 1 is that an air conditioner controller 16, an operation unit 17, and a contactor 18 are added.

The determination of connector non-connection is the same as in the first embodiment. When it is determined that the connector is not connected, the control circuit 10 transmits a signal indicating that the connector is not connected to the air conditioner controller 16. And the air conditioner controller 1
6 operates to turn off the contactor 18. Thus, the voltage exposure of the battery 1 due to the disconnection of the connector 11 can be prevented.

FIG. 4 is a circuit diagram of a vehicle air conditioner according to a fourth embodiment of the present invention. The difference from the circuit diagram of the automotive air conditioner according to the second embodiment of the present invention shown in FIG. 2 is that a voltage detection circuit 15 is added.

Even if either the connector 11 or the connector 19 is not connected, no current flows through the charging resistor 9,
No voltage is generated. The LED of the charging current detection circuit 14 does not light up, so that the phototransistor remains off, and the voltage of the control circuit power supply 7 is not transmitted to the control circuit 10.

Therefore, the control circuit 10 controls the connector 1
1. It can be determined that one of the connectors 19 is not connected, but it cannot be distinguished which connector it is.

Therefore, the control circuit 10 controls the voltage detection circuit 1
By confirming the voltage of the battery 1 with the signal from the terminal 5, if the voltage is a normal value, the connector 19 is not connected,
When this voltage is 0, it can be determined that the connector 11 is not connected.

Then, by displaying the distinguished information on the operation unit 17 via the air conditioner controller 16, the location can be accurately specified.

Accordingly, the serviceability can be improved. It should be noted that the present invention is not limited to the above-described embodiment, and various methods are possible within a range satisfying the gist of the present invention.

[0036]

According to the present invention, there is provided a charge detecting device for detecting a charging current flowing in the charging device and transmitting a current signal to the control device.

Then, the control device operates the electric compressor driving device before operating the opening / closing device.

At this time, if the power connector or the compressor connector is not connected, no current flows to the charging device, so that no current signal is transmitted from the charging detecting device,
The control device determines that the electric connection is open, and does not operate the opening / closing device and the electric compressor drive device.

Further, by turning off the upstream contactor, exposure of the power supply voltage can be prevented.

Then, by extracting information from the control device, it can be determined that the connector is not connected.

Accordingly, the disconnection of the connector can be detected, the exposure of the voltage can be prevented, the serviceability can be improved, and the deterioration of the connector can be prevented.

Also, since the current is from the charging device, the current is small, and even if there is an abnormality in the compressor connector, damage can be reduced.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an automotive air conditioner according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram of a vehicle air conditioner according to a second embodiment of the present invention.

FIG. 3 is a circuit diagram of an automotive air conditioner according to a third embodiment of the present invention.

FIG. 4 is a circuit diagram of a vehicle air conditioner according to a fourth embodiment of the present invention.

FIG. 5 is a circuit diagram of a conventional automotive air conditioner.

FIG. 6 is a current waveform diagram of a conventional electric compressor driving device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery 2 Power supply for relay 3 Capacitor 4 Electric compressor drive device 5 Electric compressor 6 Fuse 7 Control circuit power supply 8 Relay 9 Charging resistance 10 Control circuit 11 Power supply connector 12 Diode 13 Reset circuit 14 Charge current detection circuit 15 Voltage detection device 16 Air conditioner controller 17 Operation section 18 Contactor 19 Compressor connector

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-311602 (JP, A) JP-A-7-67248 (JP, A) JP-A-6-205588 (JP, A) JP-A-62-1987 238933 (JP, A) JP-A-7-71805 (JP, A) JP-A-8-251927 (JP, A) JP-A-5-149597 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60H 1/32 622 B60H 1/00 F24F 11/02 F25B 49/02 570 B60H 1/32 623 B60H 1/32 624 B60H 1/00 101

Claims (1)

(57) [Claims] 1. A DC voltage generator, a charging device connected in series to the DC voltage generator, a switchgear connected in parallel with the charging device, and a DC voltage generator through the charging device. And a capacitor to be charged and supplied with electric power from the DC voltage generating means via the switching device to operate an electric compressor driving device for driving an electric compressor for air conditioning, and to operate the switching device and the electric compressor driving device. A control device, comprising: a charging detection device that detects a charging current flowing to the charging device and transmits a current signal to the control device, wherein the control device is configured to drive the electric compressor driving device before operating the switching device. When the current signal is not transmitted from the charge detection device, it is determined that the electric connection portion is open, and the switching device, An air conditioner for an automobile, wherein the electric compressor drive device is not operated.