Testing equipment and testing method for high-voltage interlocking loop of electric vehicle

Abstract

The invention discloses an electric vehicle high-voltage interlocking loop test device and method, and the device comprises a communication module which is connected with an upper computer; the control module is connected with the communication module; the IN interface is connected with the input end of a to-be-tested high-voltage interlocking loop; the OUT interface is connected with the output end of the high-voltage interlocking loop to be tested; the adjustable resistor is connected between the IN interface and the OUT interface, and the adjustable resistor is electrically connected with the control module; the input end of the signal and waveform generation module is connected with the control module, and the output end of the signal and waveform generation module is connected between the adjustable resistor and the OUT interface; the first switch is connected between the IN interface and the adjustable resistor, and the first switch is a normally closed switch; wherein the first switch is electrically connected with the control module.

Description

Technical Field

[0001] The invention belongs to the technical field of electric vehicle high-voltage interlocking circuit testing, and in particular relates to an electric vehicle high-voltage interlocking circuit testing device and a testing method. Background Art

[0002] At present, there are many high-voltage components in electric vehicles, such as battery packs, on-board chargers, electric drive assemblies, PTCs, etc. These components have wiring harness connectors for connecting components to external electrical circuits. Usually, in order to ensure the safety of high-voltage connections in electric vehicles, various high-voltage connectors are connected by high-voltage interlocking circuits to form one or more high-voltage interlocking circuits. In the high-voltage interlocking circuit, a controller will send out a constant voltage signal, a constant current signal, or a PWM signal, etc., and then determine whether the wiring harness connector on the circuit is correctly connected by detecting the corresponding signal.

[0003] In view of this situation, a test device and method are needed for closed-loop testing of the high-voltage interlocking circuit. Currently, there is no corresponding test device and method. Summary of the invention

[0004] The purpose of the present invention is to provide an electric vehicle high-voltage interlocking circuit testing device, which can be used in a closed-loop test of a high-voltage interlocking circuit, simulate various fault conditions that may occur in the high-voltage interlocking circuit, and test the fault identification function of the high-voltage interlocking circuit.

[0005] The present invention also provides a method for testing a high-voltage interlocking circuit of an electric vehicle, which can execute various abnormal signal commands respectively, and the testing process is fast and reliable.

[0006] The technical solution provided by the present invention is:

[0007] An electric vehicle high voltage interlock circuit test device, comprising:

[0008] A communication module, which is connected to a host computer;

[0009] A control module connected to the communication module;

[0010] IN interface, which is connected to the input end of the high-voltage interlock circuit to be tested;

[0011] OUT interface, which is connected to the output end of the high-voltage interlock circuit to be tested;

[0012] An adjustable resistor connected between the IN interface and the OUT interface, and the adjustable resistor is electrically connected to the control module;

[0013] A signal and waveform generating module, whose input end is connected to the control module and whose output end is connected between the adjustable resistor and the OUT interface;

[0014] A first switch connected between the IN interface and the adjustable resistor, wherein the first switch is a normally closed switch;

[0015] Wherein, the first switch is electrically connected to the control module;

[0016] The command input by the host computer is transmitted to the control module through the communication module. The control module controls the signal and waveform generating module according to the command, and the adjustable resistor or the first switch respectively performs corresponding actions and outputs them to the high-voltage interlocking circuit.

[0017] Preferably, the electric vehicle high-voltage interlock circuit test equipment further comprises:

[0018] A status indication module is connected to the control module and is used to display the working status of the control module.

[0019] Preferably, the electric vehicle high-voltage interlock circuit test equipment further comprises:

[0020] A signal acquisition module, whose input end is connected between the IN interface and the first switch, and whose output end is connected to the control module; is used to acquire the excitation source type of the high-voltage interlocking loop.

[0021] Preferably, the electric vehicle high-voltage interlock circuit test equipment further comprises:

[0022] A power supply module is used to supply power to the control module, the signal and waveform generating module, the status indicating module and the signal acquisition module.

[0023] Preferably, the electric vehicle high-voltage interlock circuit test equipment further comprises:

[0024] A Power interface, which is connected between the IN interface and the first switch through a second switch and is used to connect an external power source;

[0025] Wherein, the second switch is electrically connected to the control module.

[0026] Preferably, the signal and waveform generating module further includes another output terminal connected between the Power interface and the second switch.

[0027] Preferably, the electric vehicle high-voltage interlock circuit test equipment further comprises:

[0028] A GND terminal connected between the IN interface and the first switch through a third switch,

[0029] Wherein, the third switch is electrically connected to the control module.

[0030] A method for testing a high-voltage interlocking circuit of an electric vehicle, using the electric vehicle high-voltage interlocking circuit testing device, comprising:

[0031] The host computer inputs abnormal voltage, abnormal current or abnormal PWM command, which is transmitted to the control module through the communication module. The control module controls the signal and waveform generation module to generate corresponding abnormal waveforms according to the command, and outputs them to the high-voltage interlocking circuit;

[0032] The host computer inputs an abnormal resistance command, which is transmitted to the control module via the communication module. The control module controls the adjustable resistor to adjust to the corresponding abnormal resistance value according to the command, and outputs it to the high-voltage interlocking circuit;

[0033] The host computer inputs a disconnection command, which is transmitted to the control module via the communication module, and the control module controls the first switch to be disconnected.

[0034] The beneficial effects of the present invention are:

[0035] The electric vehicle high-voltage interlocking circuit test equipment provided by the present invention can be applied to the closed-loop test of the high-voltage interlocking circuit. In the development stage, the closed-loop test is performed on the fault identification function of the high-voltage interlocking circuit to verify the consistency and reliability of the function.

[0036] The electric vehicle high-voltage interlocking circuit testing method provided by the present invention can simulate various fault conditions that may occur in the high-voltage interlocking circuit, test whether the controller can normally identify the fault and make corresponding feedback, and the testing process is fast and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a framework diagram of the electric vehicle high-voltage interlock circuit testing equipment described in the present invention.

[0038] Figure 2 It is a schematic diagram of the connection structure between the electric vehicle high-voltage interlock circuit testing equipment and the high-voltage interlock circuit being tested according to the present invention. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0040] like Figure 1 As shown, the present invention provides an electric vehicle high-voltage interlocking circuit testing device, which includes a communication module, a control module, an IN interface, an OUT interface, an adjustable resistor, a signal and waveform generating module and a first switch.

[0041] The communication module is connected to the host computer through a communication interface, and the control module is connected to the communication module. The IN interface is used to connect the input end of the high-voltage interlocking circuit to be tested, and the OUT interface is used to connect the output end of the high-voltage interlocking circuit to be tested. The adjustable resistor is connected between the IN interface and the OUT interface, and the adjustable resistor is electrically connected to the control module; the resistance value output by the adjustable resistor can be controlled by the control module.

[0042] The input end of the signal and waveform generating module is connected to the control module, and the output end is connected between the adjustable resistor and the OUT interface. The control module can control the signal and waveform generating module to emit voltage, current or PWM waveform.

[0043] The first switch is connected between the IN interface and the adjustable resistor, and the first switch is electrically connected to the control module, and the control module can control the opening and closing of the first switch. The first switch is a normally closed switch, and when a circuit breaker test is required for the high-voltage interlock circuit, the control module controls the first switch to open.

[0044] As a preference, the electric vehicle high-voltage interlock circuit test equipment further comprises: a status indication module, which is connected to the control module and is used to display the working status of the control module.

[0045] As a preferred embodiment, the electric vehicle high-voltage interlocking circuit test equipment further includes: a signal acquisition module, whose input end is connected between the IN interface and the first switch, and whose output end is connected to the control module; used to acquire the excitation source type of the high-voltage interlocking circuit. The signal acquisition module is set to directly obtain the excitation source type of the high-voltage interlocking circuit, verify the known excitation source type of the high-voltage interlocking circuit, and avoid erroneous testing.

[0046] As a preferred embodiment, the electric vehicle high-voltage interlock circuit test equipment further includes: a power supply module, which is used to supply power to the control module, the signal and waveform generating module, the state indicating module and the signal acquisition module.

[0047] As a further preference, the electric vehicle high-voltage interlock circuit test equipment further includes: a Power interface, which is connected between the IN interface and the first switch through a second switch, and is used to connect an external power supply. Wherein, the second switch is a normally open switch, and the second switch is electrically connected to the control module. An external power supply (such as a 12V or 5V power supply) is connected through the Power interface and the second switch is controlled to close through the control module, so that the high-voltage interlock circuit to be tested is short-circuited, that is, a short-circuit fault is simulated, and a short-circuit test is performed on the high-voltage interlock circuit.

[0048] As a further preference, the signal and waveform generating module further includes another output terminal, which is connected between the Power interface and the second switch. After closing the second switch, the control module can be used to control the signal and waveform generating module to emit a corresponding waveform, simulate more types of short-circuit signals, and perform a short-circuit test on the high-voltage interlocking circuit. This avoids the problem of a single signal directly connected to an external power supply through the Power interface, which is inconvenient to adjust.

[0049] As a further preferred embodiment, the electric vehicle high-voltage interlock circuit test equipment further includes: a GND terminal, which is connected between the IN interface and the first switch through a third switch. The third switch is a normally open switch, and the third switch is electrically connected to the control module. The third switch is controlled to close by the control module, and the high-voltage interlock circuit to be tested is short-grounded, that is, a short-ground fault is simulated, and a short-ground test is performed on the high-voltage interlock circuit.

[0050] like Figure 2 As shown, in one embodiment, the high-voltage interlocking circuit to be tested is composed of a battery pack controller, an on-board charger and an electric compressor, and the output end of the high-voltage interlocking circuit is arranged at the battery pack controller and connected to the IN interface of the high-voltage interlocking circuit test equipment; the output end is arranged at the on-board charger and connected to the OUT interface of the high-voltage interlocking circuit test equipment.

[0051] The present invention also provides a method for testing a high-voltage interlocking circuit of an electric vehicle. Using the electric vehicle high-voltage interlocking circuit testing device, the specific control method is as follows.

[0052] (1) Perform abnormal voltage, abnormal current or abnormal PWM test

[0053] Determine the excitation source type (voltage type, current type or PWM type) of the high-voltage interlocking circuit, and input the corresponding abnormal voltage, abnormal current or abnormal PWM command through the host computer. Transmit it to the control module through the communication module, and the control module controls the signal and waveform generation module to generate the corresponding abnormal waveform according to the command, and outputs it to the high-voltage interlocking circuit. If the high-voltage interlocking circuit can identify the corresponding fault and issue an early warning prompt, it is judged that the abnormal voltage, abnormal current or abnormal PWM recognition function of the high-voltage interlocking circuit is qualified.

[0054] If the excitation source type of the high-voltage interlock circuit to be tested is unclear, or in order to verify the excitation source type of a known high-voltage interlock circuit to avoid erroneous testing, before performing abnormal voltage, abnormal current or abnormal PWM testing, the excitation source type information of the high-voltage interlock circuit can be collected by the signal acquisition module and transmitted to the host computer through the control module, so that the appropriate test signal can be selected according to the excitation type in the next step.

[0055] (2) Perform abnormal resistance test

[0056] The abnormal resistance command is input through the host computer and transmitted to the control module through the communication module. The control module controls the adjustable resistor to adjust to the corresponding abnormal resistance value according to the command and outputs it to the high-voltage interlocking circuit. If the high-voltage interlocking circuit can identify the abnormal resistance fault and issue an early warning prompt, it is judged that the abnormal resistance identification function of the high-voltage interlocking circuit is qualified.

[0057] (3) Conduct a circuit breaker test

[0058] The host computer inputs a circuit breaking command, which is transmitted to the control module via the communication module. The control module controls the first switch to be disconnected, simulating a circuit breaking fault in the high-voltage interlocking circuit. If the high-voltage interlocking circuit can identify the circuit breaking fault and issue an early warning prompt, it is determined that the circuit breaking identification function of the high-voltage interlocking circuit is qualified.

[0059] (4) Perform a short circuit test

[0060] The Power interface is connected to an external power supply (such as a 12V or 5V power supply), and the host computer issues a short-circuit test command, and controls the second switch to be closed through the control module, so that the high-voltage interlock circuit to be tested is short-circuited, that is, a short-circuit fault is simulated, and a short-circuit test is performed on the high-voltage interlock circuit. If the high-voltage interlock circuit can identify the short-circuit fault and issue an early warning prompt, it is judged that the circuit break recognition function of the high-voltage interlock circuit is qualified.

[0061] In addition, the host computer can also issue a command, the control module controls the signal, the waveform generation module sends a corresponding waveform, and the control module controls the second switch to close, simulating more types of short-circuit signals to perform a short-circuit test on the high-voltage interlocking circuit. This avoids the problem of a single signal and inconvenience in adjusting when directly connecting an external power supply through the Power interface.

[0062] (5) Perform a short-distance test

[0063] The host computer issues a short-to-ground test command, and controls the third switch to close through the control module, so that the high-voltage interlock circuit to be tested is short-to-grounded, that is, a short-to-ground fault is simulated, and a short-to-ground test is performed on the high-voltage interlock circuit. If the high-voltage interlock circuit can identify the short-to-ground fault and issue an early warning prompt, it is judged that the ground break identification function of the high-voltage interlock circuit is qualified.

[0064] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An electric vehicle high voltage interlock circuit test device, characterized in that: include: A communication module, which is connected to a host computer; A control module connected to the communication module; IN interface, which is connected to the input end of the high-voltage interlock circuit to be tested; OUT interface, which is connected to the output end of the high-voltage interlock circuit to be tested; An adjustable resistor connected between the IN interface and the OUT interface, and the adjustable resistor is electrically connected to the control module; A signal and waveform generating module, whose input end is connected to the control module and whose output end is connected between the adjustable resistor and the OUT interface; A first switch connected between the IN interface and the adjustable resistor, wherein the first switch is a normally closed switch; Wherein, the first switch is electrically connected to the control module.

2. The electric vehicle high voltage interlock circuit test equipment according to claim 1, characterized in that: Also includes: A status indication module is connected to the control module and is used to display the working status of the control module.

3. The electric vehicle high voltage interlock circuit test equipment according to claim 2, characterized in that: Also includes: a signal acquisition module, whose input end is connected between the IN interface and the first switch, and whose output end is connected to the control module; Used to collect the excitation source type of the high-voltage interlocking loop.

4. The electric vehicle high voltage interlock circuit test equipment according to claim 3, characterized in that: Also includes: A power supply module is used to supply power to the control module, the signal and waveform generating module, the status indicating module and the signal acquisition module.

5. The electric vehicle high voltage interlock circuit test equipment according to any one of claims 1 to 4, characterized in that: Also includes: A Power interface, which is connected between the IN interface and the first switch through a second switch and is used to connect an external power source; Wherein, the second switch is electrically connected to the control module.

6. The electric vehicle high voltage interlock circuit test equipment according to claim 5, characterized in that: The signal and waveform generating module further includes another output terminal connected between the Power interface and the second switch.

7. The electric vehicle high voltage interlock circuit test equipment according to claim 6, characterized in that: Also includes: A GND terminal connected between the IN interface and the first switch through a third switch, Wherein, the third switch is electrically connected to the control module.

8. A method for testing a high-voltage interlocking circuit of an electric vehicle, using the high-voltage interlocking circuit testing device of an electric vehicle as claimed in any one of claims 1 to 7, characterized in that: include: The host computer inputs abnormal voltage, abnormal current or abnormal PWM command, which is transmitted to the control module through the communication module. The control module controls the signal and waveform generation module to generate corresponding abnormal waveforms according to the command, and outputs them to the high-voltage interlocking circuit; The host computer inputs an abnormal resistance command, which is transmitted to the control module via the communication module. The control module controls the adjustable resistor to adjust to the corresponding abnormal resistance value according to the command, and outputs it to the high-voltage interlocking circuit; The host computer inputs a disconnection command, which is transmitted to the control module via the communication module, and the control module controls the first switch to be disconnected.

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