JPH11108977A - Tester for sensor for deterioration in insulation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the testing of the operation of a sensor for deterioration in insulation in a strong electric system. SOLUTION: A tester which performs an operation test of a sensor of deterioration in insulation of a power source system insulated from a body is provided with a connector 13 connectable to a connector on the side of the power source system, and resistors R1-R3 connected between the power source system and the body through the connector 13. This facilitates the operation test of the sensor for deterioration in insulation installed in the power source system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a test device for confirming the operation of an insulation deterioration sensor.

[0002]

2. Description of the Related Art In a vehicle using an electric motor as a driving source for driving, a high-voltage battery for supplying high-voltage power to the motor and a low-voltage battery for supplying low-voltage power to general low-voltage devices and electronic circuits are used. Have. Usually, a high-voltage system that connects a high-voltage battery and a motor is insulated from a vehicle body, and a low-voltage system that connects a low-voltage battery to low-voltage devices and electronic circuits has one of low-voltage power supplies connected to the vehicle body. The high-power system is wired by means of an insulated shielded cable and an insulated shielded connector. Further, an insulation deterioration sensor is installed in the high-power system in order to detect the presence / absence of electric leakage to the vehicle body. The shield part of the wire and the connector and the protective case are connected to the vehicle body.

In order to confirm whether or not the insulation deterioration sensor of the high-power system operates normally, a protective case is removed to insert a resistor between the high-power line and the vehicle body, or a terminal of the connector portion is connected to the vehicle body. Insert a resistor between them to forcibly degrade the insulation and check the output signal of the insulation deterioration sensor.

[0004] However, the method of removing the protective case for the operation test of the insulation deterioration sensor has poor operability, and the method of connecting a resistor between the connector terminal and the vehicle body may damage the connector terminal.

An object of the present invention is to provide a test apparatus which can easily perform an operation test of an insulation deterioration sensor of a high-power system.

[0006]

[Means for Solving the Problems]

(1) The invention according to claim 1 is a test device for performing an operation test on an insulation deterioration sensor of a power supply system insulated from a vehicle body, the connector being connectable to a connector on the power supply side, and A resistor is provided between the power supply system and the vehicle body. (2) The test apparatus for an insulation deterioration sensor according to claim 2 is:
The connector is a shield connector, and the shield part is connected to the vehicle body on the power supply system side. (3) The test device for an insulation deterioration sensor according to claim 3 is:
The resistor includes a plurality of resistors having different resistance values, and these are switched by a switch. (4) The test device for an insulation deterioration sensor according to claim 4 is:
A circuit breaker is installed between the power supply of the power supply system and the insulation deterioration sensor. When the connector on the test equipment side is connected to the connector on the power supply side, turning on the circuit breaker is prohibited. .

[0007]

【The invention's effect】

(1) According to the first and second aspects of the invention, an operation test of the insulation deterioration sensor installed in the power supply system can be easily performed. (2) According to the third aspect of the invention, it is possible to accurately detect the insulation deterioration state of the power supply system. (3) According to the invention of claim 4, an operation test of the insulation deterioration sensor installed in the power supply system can be easily and safely performed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment in which the present invention is applied to an electric vehicle will be described. FIG. 1 is a circuit diagram of a high-voltage power supply unit of an electric vehicle. The high-voltage battery 1 supplies high-voltage power to a motor (not shown) via a junction box 2. The junction box 2 is provided with main relays 3a and 3b and an insulation deterioration sensor 4. The main relays 3a and 3b are turned on and off by the battery controller 5, and turn on and off the high voltage power supply. The insulation deterioration sensor 4 detects occurrence of electric leakage due to insulation deterioration between the high voltage line and the vehicle body, and sends an electric leakage detection signal to the battery controller 5. The low-voltage battery 6 supplies low-voltage power to the coils of the main relays 3a and 3b, the battery controller 5, and the like.

[0010] The high-voltage battery 1 and the junction box 2 and the junction box 2 and the motor are respectively wired by using an insulated shielded cable 7 as shown in FIG. The connection is made by using the shield shield connectors 8 and 9. As shown in FIG. 3, the connector 9 on the load side is a male connector 9a attached to the tip of the shielded cable 7.
And a female connector 9b fixed to the junction box 2, and are connected as shown in FIG. When the male connector 9a is inserted into the female connector 9b, the signal wires 11a and 11b of the battery controller 5 are short-circuited by the jumper 10 of the male connector 9a, so that it can be confirmed that the male connector 9a and the female connector 9b are securely connected. It has become. Confirmation of this connection is a condition for permitting the battery controller 5 to turn on the main relays 3a and 3b. The connector 8 on the high voltage battery 1 has the same configuration.

The junction box 2 and the negative electrode of the low-voltage battery 6 are connected to the vehicle body. As shown in FIG. 3, the shield portion of the shield cable 7 is connected to the vehicle body via the shield portions of the male connector 9a and the female connector 9b and the junction box 2. On the other hand, the core of the shielded cable 7 charged with the high voltage by the high-voltage battery 1 is insulated from the vehicle body.

FIG. 5 is a front view (a) and a side view (b) showing a test device for confirming the operation of the insulation deterioration sensor 4. FIG. 6 is a circuit diagram of the test apparatus. The test device 12 of the insulation deterioration sensor 4 includes a male connector 13, a rotary switch 14, and a resistor R1.
To R3. The male connector 13 can be connected to the load-side female connector 9a of the junction box 2. The male connector 13 has no jumper 10. The rotary switch 14
This switch switches the resistors R1 to R3 having different resistance values. The resistors R1 to R3 serve as simulated insulation resistance between the vehicle body and the high voltage line.

When the male connector 13 of the test device 12 is connected to the load-side female connector 9b of the junction box 2, the test insulation resistors R1 to R3 are connected between the high-voltage line of the high-power system and the vehicle body. You. At this time, since the jumper 10 is not provided in the male connector 13 of the test apparatus 12, the signal lines 11a and 11b of the battery controller 5 are not short-circuited, and therefore, the battery controller 5 is connected to the main relays 3a and 3b.
Inhibit the input of b. As a result, during the operation test of the insulation deterioration sensor 4 by the test device 12, there is no possibility that the main relays 3a and 3b are accidentally turned on and the high voltage line on the load side is charged with the high voltage.

When the test device 12 is connected to the junction box 2, the insulation resistance between the high voltage line on the load side where the insulation deterioration sensor 4 is installed and the vehicle body is forcibly set by the resistors R1 to R3. It becomes the resistance value. If the insulation deterioration sensor 4 operates and a leakage detection signal is output to the battery controller 5, it can be determined that the insulation deterioration sensor 4 operates normally. On the other hand, the resistors R <b> 1 to R <b> 1 to be detected by the rotary switch 14
If the leakage detection signal is not output from the insulation deterioration sensor 4 even after the switching to R3, it can be determined that the insulation deterioration sensor 4 is out of order.

In the above embodiment, the insulation deterioration sensor 4 serves as an insulation deterioration sensor, the female connector 9b serves as a power system side connector, and the male connector 13 serves as a male connector.
Represents a connector on the test device side, resistors R1 to R3 constitute a resistor, rotary switch 14 constitutes a switch, and main relays 3a and 3b constitute circuit breakers.

In the above-described embodiment, an example is shown in which the present invention is applied to an electric vehicle. However, the present invention is not limited to an electric vehicle, but is applied to all devices having a power supply system insulated from a vehicle body. be able to. Further, in the above-described embodiment, an example in which three resistors are used in the test apparatus has been described, but the number of resistors is not limited to three.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a high-voltage power supply unit of an electric vehicle.

FIG. 2 is a diagram illustrating an insulated shielded cable for high-voltage distribution.

FIG. 3 is a partial cross-sectional view showing an insulating-coated shield connector for high-voltage power distribution.

FIG. 4 is a cross-sectional view showing a connection state of an insulation-coated shield connector for high-voltage distribution.

FIG. 5 is an external view of a test device for an insulation deterioration sensor.

FIG. 6 is a circuit diagram of a test device for an insulation deterioration sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High voltage battery 2 Junction box 3a, 3b Main relay 4 Insulation deterioration sensor 5 Battery controller 6 Low voltage battery 7 Insulation coating shield cable 8, 9 Insulation coating shield connector 8a, 9a Male connector 8b, 9b Female connector 10 Jumper 11a, 11b Signal line 12 Test equipment 13 Male connector 14 Rotary switch R1-R3 Resistor

Claims (4)

[Claims] 1. A test apparatus for performing an operation test on an insulation deterioration sensor of a power supply system insulated from a vehicle body, comprising: a connector connectable to a connector on the power supply side; and the power supply system via the connector. A test device for an insulation deterioration sensor, comprising: a resistor connected between the body and a vehicle body. 2. The insulation deterioration sensor test apparatus according to claim 1, wherein the connector is a shielded connector, and the shield portion is connected to the vehicle body on the power supply system side. Test equipment. 3. The test apparatus for an insulation deterioration sensor according to claim 1, wherein the resistor includes a plurality of resistors having different resistance values, and the resistors are switched by a switch. Test equipment for insulation deterioration sensor. 4. The test apparatus for an insulation deterioration sensor according to claim 1, wherein a circuit breaker is provided between a power supply of the power supply system and the insulation deterioration sensor. When the connector on the test device side is connected to the connector on the power supply system side, closing of the circuit breaker is prohibited.