System and method for testing electrical performance of intelligent power distribution controller

Abstract

The invention relates to an intelligent power distribution controller electrical performance test system and method, which are applied to the technical field of automotive electronics, and the system comprises an intelligent power distribution controller, a power supply subsystem, an automatic control subsystem, a data acquisition subsystem, a signal simulation subsystem, a loop switching subsystem and a load simulation subsystem. The intelligent power distribution controller is respectively connected with the power supply subsystem, the signal simulation subsystem and the loop switching subsystem; the load simulation subsystem is connected with the loop switching subsystem; the automatic control subsystem is respectively connected with the loop switching subsystem, the signal simulation subsystem, the data acquisition subsystem and the load simulation subsystem; and the automatic control subsystem is used for respectively sending control instructions to the signal simulation subsystem, the loop switching subsystem, the load simulation subsystem, the data acquisition subsystem and the power supply subsystem and outputting test results in the process of operating an automatic test sequence corresponding to the power distribution loop type of the intelligent power distribution controller. The test efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the field of automotive electronics technology, and in particular to an electrical performance testing system and method for an intelligent power distribution controller. Background Art

[0002] The power distribution system in the intelligent power distribution controller is based on Mosfet (metal-oxide semiconductor FET, metal-oxide semiconductor field-effect transistor) as the core, combined with detection, diagnosis and control circuits to achieve loop opening and closing control, and then realize the intelligent power distribution system of load power supply control.

[0003] In the related art, the automated test system for intelligent power distribution controllers can only verify the functional logic (i.e. mounting real loads, simulating bus / hard-wire signal transmission, detecting loop closure, etc.). However, electrical performance test items (such as harness protection, load current simulation, etc.) still require manual access to the device and manual testing, which results in low test efficiency. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides an intelligent power distribution controller electrical performance testing system, method and storage medium.

[0005] According to a first aspect of the present application, there is provided an intelligent power distribution controller electrical performance test system, comprising: an intelligent power distribution controller, a power supply subsystem, an automation control subsystem, a data acquisition subsystem, a signal simulation subsystem, a loop switching subsystem and a load simulation subsystem;

[0006] The intelligent power distribution controller is respectively connected to the power supply subsystem, the signal simulation subsystem and the loop switching subsystem; the load simulation subsystem is connected to the loop switching subsystem; the automation control subsystem is respectively connected to the loop switching subsystem, the signal simulation subsystem, the data acquisition subsystem and the load simulation subsystem;

[0007] The automation control subsystem is used to send control instructions to the signal simulation subsystem, the circuit switching subsystem, the load simulation subsystem, the data acquisition subsystem and the power supply subsystem respectively, and output test results during the operation of the automation test sequence corresponding to the distribution circuit type of the intelligent distribution controller.

[0008] Optionally, the automation control subsystem is specifically used to send a first control instruction, a second control instruction, a third control instruction, a fourth control instruction and a fifth control instruction to the signal simulation subsystem, the loop switching subsystem, the load simulation subsystem, the data acquisition subsystem and the power supply subsystem respectively;

[0009] The power supply subsystem is used to supply power to the intelligent power distribution controller in response to the fifth control instruction;

[0010] The signal simulation subsystem is used to output a loop control signal in response to the first control instruction, and send the loop control signal to the intelligent power distribution controller;

[0011] The intelligent power distribution controller is used to control the loop of the intelligent power distribution controller in response to the loop control signal, and send a state signal of the intelligent power distribution controller to the signal simulation subsystem;

[0012] The signal simulation subsystem is further used to analyze the state signal of the intelligent power distribution controller, obtain an analysis result, and send the analysis result to the automation control subsystem;

[0013] The circuit switching subsystem is used to switch the circuit between the intelligent power distribution controller and the load simulation subsystem in response to the second control instruction;

[0014] The load simulation subsystem is used to simulate the load outputting an operating current or simulating a load failure in response to the third control instruction;

[0015] The data acquisition subsystem is used to collect monitoring data of the intelligent power distribution controller in response to the fourth control instruction, and send the monitoring data to the automation control subsystem;

[0016] The automatic control subsystem is specifically used to generate test results based on the monitoring data and the analysis results.

[0017] Optionally, the loop switching subsystem comprises: a switch group, a terminal block and a load polarity switching module, and the switch group and the load polarity switching module are connected via the terminal block;

[0018] The switch group includes: a first bridge drive relay and a second bridge drive relay, wherein the first bridge drive relay and the second bridge drive relay are both connected to the intelligent power distribution controller and are both connected to the terminal block;

[0019] The load polarity switching module includes: a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay, a seventh relay and an eighth relay; the first relay, the third relay, the fifth relay and the seventh relay are all connected to the terminal block, the second relay is respectively connected to the first relay and the load simulation subsystem; the fourth relay is respectively connected to the fifth relay and the load simulation subsystem; the sixth relay is respectively connected to the third relay and the load simulation subsystem; the eighth relay is respectively connected to the seventh relay and the load simulation subsystem;

[0020] The circuit switching subsystem is specifically used to close the first bridge drive relay and the second bridge drive relay when the power distribution circuit type of the intelligent power distribution controller is bridge drive; and

[0021] In the case of a bridge drive forward voltage test, the first relay, the second relay, the seventh relay and the eighth relay are closed, and the third relay, the fourth relay, the fifth relay and the sixth relay are opened;

[0022] In the case of a bridge drive reverse voltage test, the third relay, the fourth relay, the fifth relay, and the sixth relay are closed, and the first relay, the second relay, the seventh relay, and the eighth relay are opened.

[0023] Optionally, the switch group further includes: a non-bridge drive relay and a grounding terminal relay; the non-bridge drive relay is connected to the intelligent power distribution controller and the terminal block; one end of the grounding terminal relay is grounded, and the other end is connected to the terminal block;

[0024] The circuit switching subsystem is further used to disconnect the non-bridge drive relay and the ground terminal relay when the power distribution circuit type of the intelligent power distribution controller is bridge drive;

[0025] The circuit switching subsystem is further configured to close the non-bridge drive relay and the ground terminal relay, and disconnect the first bridge drive relay and the second bridge drive relay when the power distribution circuit type of the intelligent power distribution controller is high-side drive or electronic fuse drive; and

[0026] The first relay, the second relay, the seventh relay, and the eighth relay are closed, and the third relay, the fourth relay, the fifth relay, and the sixth relay are opened.

[0027] Optionally, the load simulation subsystem includes: a controllable load and waveform control module;

[0028] The controllable load is used to simulate the load outputting a stable working current, a rated working current or simulating a load failure;

[0029] The waveform control module is used to control the controllable load to output a set waveform current.

[0030] Optionally, the power supply subsystem includes a high-precision power supply and a battery;

[0031] The power supply subsystem is specifically used to provide constant voltage power supply to the intelligent power distribution controller through the high-precision power supply in response to the received control instructions; and to inject a voltage waveform into the intelligent power distribution controller when the automated test sequence includes a voltage regulation test item; and to supplement the power of the high-precision power supply by controlling the discharge of the battery when the power of the high-precision power supply is insufficient.

[0032] According to a second aspect of the present application, there is provided an intelligent power distribution controller electrical performance testing method based on the intelligent power distribution controller electrical performance testing system according to the first aspect, which is applied to the intelligent power distribution controller electrical performance testing system, wherein the intelligent power distribution controller electrical performance testing system comprises: an intelligent power distribution controller, a power supply subsystem for supplying power to the intelligent power distribution controller, an automation control subsystem, a data acquisition subsystem, a signal simulation subsystem, a loop switching subsystem and a load simulation subsystem;

[0033] The method comprises:

[0034] During the process of running the automated test sequence corresponding to the power distribution circuit type of the intelligent power distribution controller, the automated control subsystem sends control instructions to the signal simulation subsystem, the circuit switching subsystem, the load simulation subsystem, the data acquisition subsystem and the power supply subsystem, and outputs the test results.

[0035] Optionally, the automation control subsystem sends control instructions to the signal simulation subsystem, the loop switching subsystem, the load simulation subsystem, the data acquisition subsystem and the power supply subsystem, and outputs test results, including:

[0036] The automation control subsystem sends a first control instruction, a second control instruction, a third control instruction, a fourth control instruction and a fifth control instruction to the signal simulation subsystem, the circuit switching subsystem, the load simulation subsystem, the data acquisition subsystem and the power supply subsystem respectively during the process of running the automation test sequence corresponding to the distribution circuit type of the intelligent power distribution controller;

[0037] The power supply subsystem supplies power to the intelligent power distribution controller in response to the fifth control instruction;

[0038] The signal simulation subsystem outputs a loop control signal in response to the first control instruction, and sends the loop control signal to the intelligent power distribution controller;

[0039] The intelligent power distribution controller controls the loop of the intelligent power distribution controller in response to the loop control signal, and sends a status signal of the intelligent power distribution controller to the signal simulation subsystem;

[0040] The signal simulation subsystem analyzes the state signal of the intelligent power distribution controller to obtain an analysis result, and sends the analysis result to the automation control subsystem;

[0041] The circuit switching subsystem switches the circuit between the intelligent power distribution controller and the load simulation subsystem in response to the second control instruction;

[0042] The load simulation subsystem responds to the third control instruction to simulate the load outputting a working current or simulating a load failure;

[0043] The data acquisition subsystem collects monitoring data of the intelligent power distribution controller in response to the fourth control instruction, and sends the monitoring data to the automation control subsystem;

[0044] The automatic control subsystem generates a test result according to the monitoring data and the analysis result.

[0045] Optionally, the loop switching subsystem comprises: a switch group, a terminal block and a load polarity switching module, and the switch group and the load polarity switching module are connected via the terminal block;

[0046] The switch group includes: a first bridge drive relay and a second bridge drive relay, wherein the first bridge drive relay and the second bridge drive relay are both connected to the intelligent power distribution controller and are both connected to the terminal block;

[0047] The load polarity switching module includes: a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay, a seventh relay and an eighth relay; the first relay, the third relay, the fifth relay and the seventh relay are all connected to the terminal block, the second relay is respectively connected to the first relay and the load simulation subsystem; the fourth relay is respectively connected to the fifth relay and the load simulation subsystem; the sixth relay is respectively connected to the third relay and the load simulation subsystem; the eighth relay is respectively connected to the seventh relay and the load simulation subsystem;

[0048] The method further comprises:

[0049] In the case where the power distribution circuit type of the intelligent power distribution controller is bridge drive, the circuit switching subsystem closes the first bridge drive relay and the second bridge drive relay; and

[0050] In the case of a bridge drive forward voltage test, the first relay, the second relay, the seventh relay and the eighth relay are closed, and the third relay, the fourth relay, the fifth relay and the sixth relay are opened;

[0051] In the case of a bridge drive reverse voltage test, the third relay, the fourth relay, the fifth relay, and the sixth relay are closed, and the first relay, the second relay, the seventh relay, and the eighth relay are opened.

[0052] Optionally, the switch group further includes: a non-bridge drive relay and a grounding terminal relay; the non-bridge drive relay is connected to the intelligent power distribution controller and the terminal block; one end of the grounding terminal relay is grounded, and the other end is connected to the terminal block;

[0053] The method further comprises:

[0054] In the case where the power distribution circuit type of the intelligent power distribution controller is bridge drive, the circuit switching subsystem disconnects the non-bridge drive relay and the ground terminal relay;

[0055] In the case where the power distribution circuit type of the intelligent power distribution controller is high-side drive or electronic fuse drive, the circuit switching subsystem closes the non-bridge drive relay and the ground terminal relay, and disconnects the first bridge drive relay and the second bridge drive relay; and

[0056] The first relay, the second relay, the seventh relay, and the eighth relay are closed, and the third relay, the fourth relay, the fifth relay, and the sixth relay are opened.

[0057] Optionally, the load simulation subsystem includes: a controllable load and waveform control module;

[0058] The load simulation subsystem responds to the third control instruction to simulate the load outputting a working current or simulating a load failure, including:

[0059] The controllable load responds to the third control instruction, the simulated load outputs a stable working current, a rated working current, or the simulated load fails; or

[0060] The waveform control module controls the controllable load to output a set waveform current in response to the third control instruction.

[0061] Optionally, the power supply subsystem includes a high-precision power supply and a battery;

[0062] The power supply subsystem supplies power to the intelligent power distribution controller in response to the received control instruction, specifically comprising:

[0063] The power supply subsystem responds to the received control instruction, provides constant voltage power supply to the intelligent power distribution controller through the high-precision power supply; and injects voltage waveform into the intelligent power distribution controller when the automated test sequence includes a voltage regulation test item. When the power of the high-precision power supply is insufficient, the power of the high-precision power supply is supplemented by controlling the discharge of the storage battery.

[0064] According to a third aspect of the present application, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the method described in the second aspect is implemented.

[0065] According to a fourth aspect of the present application, a computer program product is provided. When the computer program product is run on a computer, the computer is enabled to execute the method described in the second aspect.

[0066] Compared with the prior art, the technical solution provided by the embodiments of the present application has the following advantages:

[0067] The connection link solution of each device in the intelligent power distribution controller electrical performance test system can realize the automated execution of the intelligent power distribution controller electrical performance test. Specifically, the automated control subsystem sends corresponding control instructions to other devices during the running of the automated test sequence, and other devices execute corresponding control items according to the received control instructions. The automated control subsystem can also output the test results to complete the automated test. For intelligent power distribution controllers with frequent iterations, using automated testing instead of manual testing can improve test efficiency and effectively save the labor costs caused by repeated testing and verification. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0069] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0070] Figure 1 A structural schematic diagram of an electrical performance test system for an intelligent power distribution controller in an embodiment of the present application;

[0071] Figure 2 This is a schematic diagram of the connection between the power supply subsystem and the intelligent power distribution controller in the embodiment of the present application;

[0072] Figure 3 This is a schematic diagram of the connection method between the connector and the terminal block in the embodiment of the present application;

[0073] Figure 4 A schematic diagram of the structure of the loop switching subsystem in the embodiment of the present application;

[0074] Figure 5 A flow chart of a method for testing the electrical performance of an intelligent power distribution controller in an embodiment of the present application. DETAILED DESCRIPTION

[0075] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0076] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present application, rather than all of the embodiments.

[0077] The intelligent power distribution controller can realize functions such as fault diagnosis and current and voltage monitoring, and through software setting of protection logic, it can protect the wiring harness and load under the circuit when abnormal conditions occur. Compared with the traditional fuse box power distribution solution using fusible insurance + relay, the solution using the intelligent power distribution controller is more convenient to modify, making its iteration more frequent. Frequent iterations will lead to frequent testing and verification, and there is a lot of repetitive work in the testing and verification of electrical performance, which will greatly increase labor costs. In order to improve testing efficiency and reduce unnecessary labor costs, the embodiments of the present application provide an intelligent power distribution controller electrical performance testing system, method and storage medium, which can realize the automated execution of the intelligent power distribution controller electrical performance test.

[0078] See also Figure 1 , Figure 1 The schematic diagram of the structure of the intelligent power distribution controller electrical performance test system in the embodiment of the present application is as follows. The intelligent power distribution controller electrical performance test system 100 includes: an intelligent power distribution controller 101, a power supply subsystem 102, an automation control subsystem 103, a data acquisition subsystem 104, a signal simulation subsystem 105, a loop switching subsystem 106 and a load simulation subsystem 107.

[0079] The intelligent power distribution controller 101 is connected to the power supply subsystem 102, the signal simulation subsystem 105 and the loop switching subsystem 106 respectively; the load simulation subsystem 107 is connected to the loop switching subsystem 106; the automation control subsystem 103 is connected to the power supply subsystem 102, the loop switching subsystem 106, the signal simulation subsystem 105, the data acquisition subsystem 104 and the load simulation subsystem 107 respectively.

[0080] The automation control subsystem 103 may include a host computer and a slave computer, and the host computer is connected to the slave computer through a communication interface. The host computer may be a computer equipped with a Windows system, which is used to provide a user interface and call the slave computer through software and interfaces. The slave computer is configured according to demand, and is generally a high-performance real-time system, which is used to communicate with each device (i.e., the power supply subsystem 102, the loop switching subsystem 106, the signal simulation subsystem 105, the data acquisition subsystem 104, and the load simulation subsystem 107), and integrates device resources for the host computer to call.

[0081] The lower computer communicates with the device and builds a Matlab / Simulink model through the interface protocol provided by the device supplier. If the system interface cannot meet the requirements, it can be used in conjunction with an expansion chassis. Each device is connected to the lower computer through various types of communication interfaces. Common communication interfaces include CAN (Controller Area Network), LAN (Local Area Network), RS485, RS232, USB (Universal Serial Bus), etc.

[0082] The upper computer runs the equipment management software and automated test software. The equipment management software establishes variables by calling the Matlab / Simulink model, and builds a human-computer interaction interface through a graphical operation interface. Users can manually operate the control device in this interface and view the data waveform sent back by the data acquisition module. The automated test software calls the variables in the equipment management software, sets the variable values, and builds an automated test sequence. The automated test sequence refers to a sequence composed of multiple test cases, and each test case contains control operations on each device. It can be understood that the automated test sequence will be different for different distribution circuit types of the intelligent distribution controller. Finally, according to the distribution circuit type of the intelligent distribution controller, the corresponding automated test sequence is run, the test is automatically executed, the result is judged, and a test report is generated.

[0083] The automated testing process is as follows:

[0084] The tester runs the automated test sequence corresponding to the distribution circuit type of the intelligent distribution controller through the automated control subsystem 103. During the process of running the automated test sequence corresponding to the distribution circuit type of the intelligent distribution controller, the automated control subsystem 103 sends control instructions to the signal simulation subsystem 105, the circuit switching subsystem 106, the load simulation subsystem 107, the data acquisition subsystem 104 and the power supply subsystem 102 respectively, and outputs the test results.

[0085] Optionally, the automation control subsystem 103 sends a first control instruction, a second control instruction, a third control instruction, a fourth control instruction and a fifth control instruction to the signal simulation subsystem 105, the circuit switching subsystem 106, the load simulation subsystem 107, the data acquisition subsystem 104 and the power supply subsystem 102 respectively during the process of running the automation test sequence corresponding to the distribution circuit type of the intelligent distribution controller. The first control instruction refers to the control instruction for the signal simulation subsystem 105, the second control instruction refers to the control instruction for the circuit switching subsystem 106, the third control instruction refers to the control instruction for the circuit switching subsystem 106, the fourth control instruction refers to the control instruction for the data acquisition subsystem 104, and the fifth control instruction refers to the control instruction for the power supply subsystem 102. The first control instruction, the second control instruction, the third control instruction, the fourth control instruction and the fifth control instruction sent by the automation control subsystem 103 will be different each time the test case is executed.

[0086] After receiving the corresponding control instructions, the power supply subsystem 102, the signal simulation subsystem 105, the loop switching subsystem 106, the load simulation subsystem 107 and the data acquisition subsystem 104 perform corresponding control operations.

[0087] The power supply subsystem 102 is used to supply power to the intelligent power distribution controller 101 in response to the received control instruction. Optionally, the power supply subsystem 102 may include a high-precision power supply and a battery. The high-precision power supply is connected in parallel with the battery, and the connection and disconnection between the high-precision power supply and the battery can be controlled by a relay. The high-precision power supply is used to provide constant voltage power supply to the intelligent power distribution controller. And when the automated test sequence includes a voltage regulation test item, a voltage waveform is injected into the intelligent power distribution controller 101. The battery is used to supplement the power of the high-precision power supply by discharging when the power of the high-precision power supply is insufficient. The functions of the high-precision power supply, the battery and the relay can be seen in Table 1.

[0088] Table 1

[0089]

[0090]

[0091] See also Figure 2 , Figure 2 This is a schematic diagram of the connection between the power supply subsystem and the intelligent power distribution controller in the embodiment of the present application. The intelligent power distribution controller can use standard connectors and connect to the power supply subsystem through a terminal block, which can improve the convenience of connecting different intelligent power distribution controllers to the system. Figure 3 , Figure 3This is a schematic diagram of the connection method between the connector and the terminal block in the embodiment of the present application. The intelligent power distribution controller uses a standard connector, and the other end can press a single loose wire into the terminal block. The terminal block can be used as a voltage sampling point to press into the voltage collection harness. Temperature sensors and current sensors can be arranged on the standard connector harness of the intelligent power distribution controller to collect temperature and current.

[0092] The electrical performance testing system of the intelligent power distribution controller of the embodiment of the present application is adapted to different intelligent power distribution controllers and provides a standardized interface for different components under test to access. The wiring method is simple and easy to use, which can save the manpower cost caused by replacing the components under test.

[0093] The control items of the automation control subsystem 103 for the high-precision power supply can be seen in Table 2.

[0094] Table 2

[0095]

[0096] There are trigger conditions for closing some loops of the intelligent power distribution controller 101. The operation on the actual vehicle is generally to click the switch on the central control screen or to operate the physical switch. For the intelligent power distribution controller 101, it is to receive a certain bus / hard-wire signal. The signal simulation subsystem 105 is used to respond to the first control instruction, output the loop control signal, and send the loop control signal to the intelligent power distribution controller 101. The intelligent power distribution controller 101 is used to control the loop of the intelligent power distribution controller in response to the loop control signal, and send the status signal of the intelligent power distribution controller to the signal simulation subsystem 105. The status signal of the intelligent power distribution controller includes the open and closed state and fault state of the loop. The signal simulation subsystem 105 is also used to parse the status signal of the intelligent power distribution controller, obtain the parsing result, and send the parsing result to the automation control subsystem. That is, the signal simulation subsystem 105 parses the status signal of the intelligent power distribution controller into the form of a bus signal, and then sends it to the automation control subsystem 103. The functions of the signal simulation subsystem can be seen in Table 3.

[0097] Table 3

[0098]

[0099] The control items of the automation control subsystem 103 on the signal simulation subsystem 105 can be seen in Table 4.

[0100] Table 4

[0101]

[0102] The circuit switching subsystem 106 is used to switch the circuit between the intelligent power distribution controller 101 and the load simulation subsystem 107 in response to the second control instruction. For example, when performing a test on a certain circuit under test, the circuit is connected to the load simulation subsystem 107, and the other irrelevant circuits remain disconnected. The number of circuits can be configured according to demand. The types of power distribution circuits of the intelligent power distribution controller include: HSD (high side drive), Efuse (electronic fuse drive), bridge drive, etc. Different circuit types correspond to different power distribution logics.

[0103] The embodiment of the present application supports an intelligent power distribution controller whose power distribution circuit type belongs to bridge drive.

[0104] Most bridge drive circuits are motor loads, which can adjust the forward and reverse rotation of the motor by applying a forward or reverse voltage. Therefore, bridge drives generally have two half-bridges, positive and negative, corresponding to the two output pins of the intelligent power distribution controller. In addition, some bridge drives will detect the current size of the positive and negative half-bridges. When the current size of the positive and negative half-bridges is different, the protection logic will be triggered to disconnect the circuit.

[0105] Optionally, the loop switching subsystem 106 may include: a switch group, a terminal block and a load polarity switching module, and the switch group and the load polarity switching module are connected via the terminal block.

[0106] The switch group includes: a first bridge drive relay and a second bridge drive relay, the first bridge drive relay and the second bridge drive relay are both connected to the intelligent power distribution controller and the terminal block. The first bridge drive relay and the second bridge drive relay correspond to the bridge drive positive pin and the bridge drive negative pin respectively.

[0107] The load polarity switching module is mainly used to switch the positive and negative poles of the load simulation subsystem 107 connected to the terminal block to realize the simulation of the forward and reverse operation of the motor. The load polarity switching module includes: a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay, a seventh relay and an eighth relay; the first relay, the third relay, the fifth relay and the seventh relay are all connected to the terminal block, the second relay is respectively connected to the first relay and the load simulation subsystem; the fourth relay is respectively connected to the fifth relay and the load simulation subsystem; the sixth relay is respectively connected to the third relay and the load simulation subsystem; the eighth relay is respectively connected to the seventh relay and the load simulation subsystem.

[0108] The loop switching subsystem 106 is specifically used to close the first bridge drive relay and the second bridge drive relay when the distribution loop type of the intelligent distribution controller is bridge drive. It should be noted that if the switch group also includes other relays, the other relays are disconnected at the same time. In addition, when performing a bridge drive forward voltage test, the first relay, the second relay, the seventh relay and the eighth relay are closed, and the third relay, the fourth relay, the fifth relay and the sixth relay are disconnected; when performing a bridge drive reverse voltage test, the third relay, the fourth relay, the fifth relay and the sixth relay are closed, and the first relay, the second relay, the seventh relay and the eighth relay are disconnected.

[0109] The embodiments of the present application may also support an intelligent power distribution controller whose power distribution circuit type is a high-side drive or an electronic fuse drive.

[0110] The switch group also includes: a non-bridge drive relay and a grounding terminal relay; the non-bridge drive relay is connected to the intelligent power distribution controller and the terminal block; one end of the grounding terminal relay is grounded, and the other end is connected to the terminal block.

[0111] The circuit switching subsystem 106 is also used to disconnect the non-bridge drive relay and the ground terminal relay when the distribution circuit type of the intelligent distribution controller is bridge drive, that is, to disconnect the remaining relays in the switch group except the first bridge drive relay and the second bridge drive relay.

[0112] The circuit switching subsystem 106 is also used to close the non-bridge drive relay and the ground terminal relay, and disconnect the first bridge drive relay and the second bridge drive relay when the distribution circuit type of the intelligent distribution controller is high-side drive or electronic fuse drive; and to close the first relay, the second relay, the seventh relay and the eighth relay, and disconnect the third relay, the fourth relay, the fifth relay and the sixth relay.

[0113] Since the electrical performance test has high requirements for the loop current tolerance, in the embodiment of the present application, the loop switching subsystem 106 can adopt the form of CAN-controlled small current relay + large current relay. The CAN-controlled relay power supply end is connected to the relay control end. When the loop needs to be closed, the CAN relay corresponds to the power supply loop, and the voltage provided by the power supply is output to the coil end of the large current relay to drive the large current relay to close, thereby realizing the control scheme of small current driving large current.

[0114] In some embodiments, the intelligent power distribution controller may also be tested for short circuit faults. In this case, the loop switching subsystem 106 and the power supply subsystem 102 may be connected via a relay, which remains disconnected when the short circuit fault test is not performed, and remains closed when the short circuit fault test is performed.

[0115] The control items of the automation control subsystem 103 on the loop switching subsystem 106 can be seen in Table 5.

[0116] Table 5

[0117]

[0118] See also Figure 4 , Figure 4 This is a structural diagram of the loop switching subsystem in the embodiment of the present application. As shown in the figure, the loop switching subsystem includes: a switch group, a terminal block and a load polarity switching module. The switch group includes: relay +1 (i.e., a non-bridge driven relay), relay +2 (i.e., a first bridge driven relay), relay -2 (i.e., a second bridge driven relay) and relay GND (ground terminal relay), relay +1 is a non-bridge driven relay, and relay +2 and relay -2 are bridge driven relays.

[0119] The load polarity switching module includes: relay A+ (i.e., the first relay), relay B+ (i.e., the second relay), relay A- (i.e., the seventh relay), relay B- (i.e., the eighth relay), relay C+ (i.e., the fifth relay), relay D+ (i.e., the fourth relay), relay C- (i.e., the third relay) and relay D- (i.e., the sixth relay).

[0120] When testing the bridge drive circuit, the switch group relay GND is disconnected, the corresponding bridge drive relays (i.e. relay +2, relay -2) are closed, and the remaining relays (i.e. relay +1) are disconnected.

[0121] When performing a bridge drive forward voltage test, relays A+, B+, A- and B- in the load polarity switching module are closed, and the remaining relays are disconnected. The positive and negative poles of the load simulation subsystem 107 correspond to the interface direction of the terminal block.

[0122] When performing a bridge drive reverse voltage test, relays C+, D+, C- and D- in the load polarity switching module are closed, and the remaining relays are disconnected. The positive and negative poles of the load simulation subsystem 107 are opposite to the interface direction of the terminal block, thereby achieving load polarity switching.

[0123] When the power distribution circuit type of the intelligent power distribution controller is high-side drive or electronic fuse drive, the circuit has no positive and negative pins, only one output pin is connected to the positive pole of the load, and the negative pole of the load is connected to the vehicle body ground. During the test, the switch group closes the relay corresponding to the tested pin (i.e. relay +1) and relay GND, and disconnects the remaining relays. The load polarity switching module keeps relay A+, relay B+, relay A- and relay B- closed, and the remaining relays are disconnected.

[0124] The load simulation subsystem 107 can replace the load under the intelligent power distribution controller. The load simulation subsystem 107 is used to simulate the load outputting working current or simulating the load failure in response to the third control instruction.

[0125] Optionally, the load simulation subsystem 107 may include: a controllable load and a waveform control module. Since the controllable load itself cannot generate any waveform current, it can cooperate with the waveform control module to simulate the real working current waveform of the load. When connected, the positive and negative poles of the output end of the waveform control module are connected to the controllable load analog input interface. The controllable load is used to simulate the load output stable working current, rated working current or simulate load failure; the waveform control module is used to control the controllable load to output a set waveform current. The functions of the controllable load and the waveform control module can be seen in Table 6.

[0126] Table 6

[0127]

[0128]

[0129] The control items of the automatic control subsystem 103 on the load simulation subsystem 107 can be seen in Table 7.

[0130] Table 7

[0131]

[0132] The data acquisition subsystem 104 is used to collect monitoring data of the intelligent power distribution controller in response to the fourth control instruction, and send the monitoring data to the automation control subsystem. The monitoring data of the intelligent power distribution controller includes the voltage between the input and output terminals of the intelligent power distribution controller, the current and temperature of the input and output terminals, etc. The voltage, current and temperature sampling points can be found in Figure 2 and Figure 4 Among them, the temperature sampling point can be attached to the surface of the wire harness using a thermocouple, the voltage sampling point can be crimped to the terminal block, and the current sampling point can be in the form of a current caliper. The data acquisition subsystem can use data acquisition instruments, oscilloscopes, boards and other equipment according to specific needs. The functions of the data acquisition subsystem can be seen in Table 8.

[0133] Table 8

[0134]

[0135] The control items of the automation control subsystem 103 on the data acquisition subsystem 104 can be seen in Table 9.

[0136] Table 9

[0137]

[0138] The automatic control subsystem 103 is also used to generate test results based on the monitoring data and analysis results.

[0139] In the electrical performance testing system of the intelligent power distribution controller of the embodiment of the present application, the automation control subsystem sends corresponding control instructions to other devices during the operation of the automation test sequence, and other devices execute corresponding control items according to the received control instructions. Among them, the data acquisition subsystem can collect monitoring data during the test and return the monitoring data. The automation control subsystem generates test results based on the monitoring data, thereby completing the automated test. The universal access method of the intelligent power distribution controller is realized through switch groups, terminal blocks, etc., which replaces the traditional manual access method and manual test execution. For intelligent power distribution controllers with frequent iterations, using automated testing instead of manual testing can improve test efficiency and effectively save the manpower cost caused by repeated testing and verification.

[0140] The embodiment of the present application also provides an intelligent power distribution controller electrical performance test method, which is applied to an intelligent power distribution controller electrical performance test system, and the intelligent power distribution controller electrical performance test system includes: an intelligent power distribution controller, a power supply subsystem for supplying power to the intelligent power distribution controller, an automation control subsystem, a data acquisition subsystem, a signal simulation subsystem, a loop switching subsystem, and a load simulation subsystem. In the process of running an automation test sequence corresponding to the type of power distribution loop of the intelligent power distribution controller, the automation control subsystem sends control instructions to the signal simulation subsystem, the loop switching subsystem, the load simulation subsystem, the data acquisition subsystem, and the power supply subsystem, and outputs the test results.

[0141] See also Figure 5 , Figure 5 This is a flow chart of a method for testing the electrical performance of an intelligent power distribution controller in an embodiment of the present application, which may include the following steps:

[0142] Step S502, when running the automated test sequence corresponding to the power distribution circuit type of the intelligent power distribution controller, the automated control subsystem sends the first control instruction, the second control instruction, the third control instruction, the fourth control instruction and the fifth control instruction to the signal simulation subsystem, the circuit switching subsystem, the load simulation subsystem, the data acquisition subsystem and the power supply subsystem respectively.

[0143] Step S504: the power supply subsystem supplies power to the intelligent power distribution controller in response to the fifth control instruction.

[0144] Step S506: the signal simulation subsystem outputs a loop control signal in response to the first control instruction, and sends the loop control signal to the intelligent power distribution controller.

[0145] Step S508: the intelligent power distribution controller controls the loop of the intelligent power distribution controller in response to the loop control signal, and sends a status signal of the intelligent power distribution controller to the signal simulation subsystem.

[0146] Step S510: the signal simulation subsystem analyzes the state signal of the intelligent power distribution controller to obtain an analysis result, and sends the analysis result to the automation control subsystem.

[0147] Step S512: the circuit switching subsystem switches the circuit between the intelligent power distribution controller and the load simulation subsystem in response to the second control instruction.

[0148] Step S514: the load simulation subsystem responds to the third control instruction to simulate the load outputting a working current or simulating a load failure.

[0149] Step S516: the data acquisition subsystem responds to the fourth control instruction, acquires monitoring data of the intelligent power distribution controller, and sends the monitoring data to the automation control subsystem.

[0150] Step S518: the automation control subsystem generates test results based on the monitoring data and the analysis results.

[0151] Optionally, the loop switching subsystem includes: a switch group, a terminal block and a load polarity switching module, and the switch group and the load polarity switching module are connected via the terminal block;

[0152] The switch group includes: a first bridge drive relay and a second bridge drive relay, the first bridge drive relay and the second bridge drive relay are both connected to the intelligent power distribution controller and are both connected to the terminal block;

[0153] The load polarity switching module includes: a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay, a seventh relay and an eighth relay; the first relay, the third relay, the fifth relay and the seventh relay are all connected to the terminal block, the second relay is respectively connected to the first relay and the load simulation subsystem; the fourth relay is respectively connected to the fifth relay and the load simulation subsystem; the sixth relay is respectively connected to the third relay and the load simulation subsystem; the eighth relay is respectively connected to the seventh relay and the load simulation subsystem;

[0154] The above-mentioned intelligent power distribution controller electrical performance test method also includes:

[0155] When the power distribution circuit type of the intelligent power distribution controller is bridge drive, the circuit switching subsystem closes the first bridge drive relay and the second bridge drive relay; and

[0156] In the case of a bridge drive forward voltage test, the first relay, the second relay, the seventh relay and the eighth relay are closed, and the third relay, the fourth relay, the fifth relay and the sixth relay are opened;

[0157] In the case of a bridge drive reverse voltage test, the third relay, the fourth relay, the fifth relay and the sixth relay are closed, and the first relay, the second relay, the seventh relay and the eighth relay are opened.

[0158] Optionally, the switch group further includes: a non-bridge drive relay and a grounding terminal relay; the non-bridge drive relay is connected to the intelligent power distribution controller and the terminal block; one end of the grounding terminal relay is grounded, and the other end is connected to the terminal block;

[0159] The above-mentioned intelligent power distribution controller electrical performance test method also includes:

[0160] When the power distribution circuit type of the intelligent power distribution controller is bridge drive, the circuit switching subsystem disconnects the non-bridge drive relay and the grounding terminal relay;

[0161] When the power distribution circuit type of the intelligent power distribution controller is high-side drive or electronic fuse drive, the circuit switching subsystem closes the non-bridge drive relay and the ground terminal relay, and opens the first bridge drive relay and the second bridge drive relay; and

[0162] The first relay, the second relay, the seventh relay, and the eighth relay are closed, and the third relay, the fourth relay, the fifth relay, and the sixth relay are opened.

[0163] Optionally, the load simulation subsystem includes: a controllable load and waveform control module;

[0164] The load simulation subsystem responds to the third control instruction to simulate the load outputting a working current or simulating a load failure, including:

[0165] The controllable load responds to the third control instruction, the simulated load outputs a stable working current, a rated working current, or the simulated load fails; or

[0166] The waveform control module controls the controllable load to output a set waveform current in response to the third control instruction.

[0167] Optionally, the power supply subsystem includes a high-precision power supply and a battery;

[0168] The power supply subsystem supplies power to the intelligent power distribution controller in response to the received control command, specifically including:

[0169] The power supply subsystem responds to the received control instructions, provides constant voltage power supply to the intelligent power distribution controller through the high-precision power supply, and injects voltage waveform into the intelligent power distribution controller when the automated test sequence includes voltage regulation test items. And when the power of the high-precision power supply is insufficient, the power is supplemented for the high-precision power supply by controlling the discharge of the battery.

[0170] The above-mentioned intelligent power distribution controller electrical performance testing method corresponds to the above-mentioned intelligent power distribution controller electrical performance testing system embodiment. Please refer to the description in the system embodiment for details, which will not be repeated here.

[0171] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the above-mentioned method for testing the electrical performance of the intelligent power distribution controller is implemented.

[0172] It should be noted that the computer-readable storage medium shown in the present application may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory, a read-only memory, an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, device or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, optical cable, radio frequency, etc., or any suitable combination of the above.

[0173] In an embodiment of the present application, a computer program product is also provided. When the computer program product is run on a computer, the computer executes the above-mentioned intelligent power distribution controller electrical performance testing method.

[0174] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0175] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An intelligent power distribution controller electrical performance test system, characterized in that: include: Intelligent power distribution controller, power supply subsystem, automation control subsystem, data acquisition subsystem, signal simulation subsystem, loop switching subsystem and load simulation subsystem; The intelligent power distribution controller is respectively connected to the power supply subsystem, the signal simulation subsystem and the loop switching subsystem; the load simulation subsystem is connected to the loop switching subsystem; the automation control subsystem is respectively connected to the loop switching subsystem, the signal simulation subsystem, the data acquisition subsystem and the load simulation subsystem; The automation control subsystem is used to send control instructions to the signal simulation subsystem, the circuit switching subsystem, the load simulation subsystem, the data acquisition subsystem and the power supply subsystem respectively, and output test results during the operation of the automation test sequence corresponding to the distribution circuit type of the intelligent distribution controller.

2. The system according to claim 1, characterized in that The automation control subsystem is specifically used to send a first control instruction, a second control instruction, a third control instruction, a fourth control instruction and a fifth control instruction to the signal simulation subsystem, the loop switching subsystem, the load simulation subsystem, the data acquisition subsystem and the power supply subsystem respectively; The power supply subsystem is used to supply power to the intelligent power distribution controller in response to the fifth control instruction; The signal simulation subsystem is used to output a loop control signal in response to the first control instruction, and send the loop control signal to the intelligent power distribution controller; The intelligent power distribution controller is used to control the loop of the intelligent power distribution controller in response to the loop control signal, and send a state signal of the intelligent power distribution controller to the signal simulation subsystem; The signal simulation subsystem is further used to analyze the state signal of the intelligent power distribution controller, obtain an analysis result, and send the analysis result to the automation control subsystem; The circuit switching subsystem is used to switch the circuit between the intelligent power distribution controller and the load simulation subsystem in response to the second control instruction; The load simulation subsystem is used to simulate the load outputting an operating current or simulating a load failure in response to the third control instruction; The data acquisition subsystem is used to collect monitoring data of the intelligent power distribution controller in response to the fourth control instruction, and send the monitoring data to the automation control subsystem; The automatic control subsystem is specifically used to generate test results based on the monitoring data and the analysis results.

3. The system according to claim 1, characterized in that The circuit switching subsystem includes: a switch group, a terminal block and a load polarity switching module, wherein the switch group and the load polarity switching module are connected via the terminal block; The switch group includes: a first bridge drive relay and a second bridge drive relay, wherein the first bridge drive relay and the second bridge drive relay are both connected to the intelligent power distribution controller and are both connected to the terminal block; The load polarity switching module includes: a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay, a seventh relay and an eighth relay; the first relay, the third relay, the fifth relay and the seventh relay are all connected to the terminal block, the second relay is respectively connected to the first relay and the load simulation subsystem; the fourth relay is respectively connected to the fifth relay and the load simulation subsystem; the sixth relay is respectively connected to the third relay and the load simulation subsystem; the eighth relay is respectively connected to the seventh relay and the load simulation subsystem; The circuit switching subsystem is specifically used to close the first bridge drive relay and the second bridge drive relay when the power distribution circuit type of the intelligent power distribution controller is bridge drive; and In the case of a bridge drive forward voltage test, the first relay, the second relay, the seventh relay and the eighth relay are closed, and the third relay, the fourth relay, the fifth relay and the sixth relay are opened; In the case of a bridge drive reverse voltage test, the third relay, the fourth relay, the fifth relay, and the sixth relay are closed, and the first relay, the second relay, the seventh relay, and the eighth relay are opened.

4. The system according to claim 3, characterized in that The switch group further includes: a non-bridge drive relay and a grounding terminal relay; the non-bridge drive relay is connected to the intelligent power distribution controller and the terminal block; one end of the grounding terminal relay is grounded, and the other end is connected to the terminal block; The circuit switching subsystem is further used to disconnect the non-bridge drive relay and the ground terminal relay when the power distribution circuit type of the intelligent power distribution controller is bridge drive; The circuit switching subsystem is further configured to close the non-bridge drive relay and the ground terminal relay, and disconnect the first bridge drive relay and the second bridge drive relay when the power distribution circuit type of the intelligent power distribution controller is high-side drive or electronic fuse drive; and The first relay, the second relay, the seventh relay, and the eighth relay are closed, and the third relay, the fourth relay, the fifth relay, and the sixth relay are opened.

5. The system according to claim 1, characterized in that The load simulation subsystem includes: a controllable load and a waveform control module; The controllable load is used to simulate the load outputting a stable working current, a rated working current or simulating a load failure; The waveform control module is used to control the controllable load to output a set waveform current.

6. The system according to claim 1, characterized in that The power supply subsystem includes a high-precision power supply and a battery; The power supply subsystem is specifically used to provide constant voltage power supply to the intelligent power distribution controller through the high-precision power supply in response to the received control instruction; and, in a case where the automated test sequence includes a voltage regulation test item, injecting a voltage waveform into the intelligent power distribution controller; When the power of the high-precision power supply is insufficient, the power of the high-precision power supply is supplemented by controlling the battery to discharge.

7. A method for testing the electrical performance of an intelligent power distribution controller based on the intelligent power distribution controller electrical performance testing system according to claim 1, characterized in that: Applied to the electrical performance test system of the intelligent power distribution controller, the electrical performance test system of the intelligent power distribution controller comprises: an intelligent power distribution controller, a power supply subsystem, an automation control subsystem, a data acquisition subsystem, a signal simulation subsystem, a loop switching subsystem and a load simulation subsystem; The method comprises: During the process of running the automated test sequence corresponding to the power distribution circuit type of the intelligent power distribution controller, the automated control subsystem sends control instructions to the signal simulation subsystem, the circuit switching subsystem, the load simulation subsystem, the data acquisition subsystem and the power supply subsystem, and outputs the test results.

8. The method according to claim 7, characterized in that The automatic control subsystem sends control instructions to the signal simulation subsystem, the loop switching subsystem, the load simulation subsystem, the data acquisition subsystem and the power supply subsystem, and outputs test results, including: The automation control subsystem sends a first control instruction, a second control instruction, a third control instruction, a fourth control instruction and a fifth control instruction to the signal simulation subsystem, the circuit switching subsystem, the load simulation subsystem, the data acquisition subsystem and the power supply subsystem respectively during the process of running the automation test sequence corresponding to the distribution circuit type of the intelligent power distribution controller; The power supply subsystem supplies power to the intelligent power distribution controller in response to the fifth control instruction; The signal simulation subsystem outputs a loop control signal in response to the first control instruction, and sends the loop control signal to the intelligent power distribution controller; The intelligent power distribution controller controls the loop of the intelligent power distribution controller in response to the loop control signal, and sends a status signal of the intelligent power distribution controller to the signal simulation subsystem; The signal simulation subsystem analyzes the state signal of the intelligent power distribution controller to obtain an analysis result, and sends the analysis result to the automation control subsystem; The circuit switching subsystem switches the circuit between the intelligent power distribution controller and the load simulation subsystem in response to the second control instruction; The load simulation subsystem responds to the third control instruction to simulate the load outputting a working current or simulating a load failure; The data acquisition subsystem collects monitoring data of the intelligent power distribution controller in response to the fourth control instruction, and sends the monitoring data to the automation control subsystem; The automatic control subsystem generates a test result according to the monitoring data and the analysis result.

9. The method according to claim 7, characterized in that: The circuit switching subsystem includes: a switch group, a terminal block and a load polarity switching module, wherein the switch group and the load polarity switching module are connected via the terminal block; The switch group includes: a first bridge drive relay and a second bridge drive relay, wherein the first bridge drive relay and the second bridge drive relay are both connected to the intelligent power distribution controller and are both connected to the terminal block; The load polarity switching module includes: a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay, a seventh relay and an eighth relay; the first relay, the third relay, the fifth relay and the seventh relay are all connected to the terminal block, the second relay is respectively connected to the first relay and the load simulation subsystem; the fourth relay is respectively connected to the fifth relay and the load simulation subsystem; the sixth relay is respectively connected to the third relay and the load simulation subsystem; the eighth relay is respectively connected to the seventh relay and the load simulation subsystem; The method further comprises: In the case where the power distribution circuit type of the intelligent power distribution controller is bridge drive, the circuit switching subsystem closes the first bridge drive relay and the second bridge drive relay; and In the case of a bridge drive forward voltage test, the first relay, the second relay, the seventh relay and the eighth relay are closed, and the third relay, the fourth relay, the fifth relay and the sixth relay are opened; In the case of a bridge drive reverse voltage test, the third relay, the fourth relay, the fifth relay, and the sixth relay are closed, and the first relay, the second relay, the seventh relay, and the eighth relay are opened.

10. The method according to claim 9, characterized in that The switch group further includes: a non-bridge drive relay and a grounding terminal relay; the non-bridge drive relay is connected to the intelligent power distribution controller and the terminal block; one end of the grounding terminal relay is grounded, and the other end is connected to the terminal block; The method further comprises: In the case where the power distribution circuit type of the intelligent power distribution controller is bridge drive, the circuit switching subsystem disconnects the non-bridge drive relay and the ground terminal relay; In the case where the power distribution circuit type of the intelligent power distribution controller is high-side drive or electronic fuse drive, the circuit switching subsystem closes the non-bridge drive relay and the ground terminal relay, and disconnects the first bridge drive relay and the second bridge drive relay; and The first relay, the second relay, the seventh relay, and the eighth relay are closed, and the third relay, the fourth relay, the fifth relay, and the sixth relay are opened.

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