Charging compatibility test system for electric vehicle and direct current charging pile

Abstract

The invention relates to an electric vehicle and direct current charging pile charging compatibility test system, which comprises a bidirectional direct current power supply, a direct current guide circuit simulator, a CAN communication simulator and a measurement and control system. The system has the advantages that electric vehicle testing and direct-current charging pile testing are integrated into one system, and functions are highly integrated; the electric vehicle test data and the charging pile test data are from the same source, so that unified comparative analysis is facilitated; the construction cost of the test system is effectively reduced, and the equipment reusability is high; the circuit structure of the test system is simple, convenient and practical to operate, and has wide popularization and use values.

Description

Technical Field

[0001] The invention belongs to the technical field of electric vehicles, and in particular relates to a charging compatibility testing system for electric vehicles and direct current charging piles. Background Art

[0002] By 2035, China's new energy vehicle ownership will reach more than 100 million. The energy of new energy vehicle batteries will reach about 5 billion kWh. If all Chinese passenger cars are converted to electric cars in the future, the on-board energy storage capacity will be basically equivalent to China's daily total electricity consumption. The total charging and discharging power of on-board battery energy storage applications for 100 million electric cars will reach a total power of about 2.5 billion to 5 billion kilowatts. The number of electric vehicles and charging piles is growing exponentially.

[0003] Electric vehicles and charging piles interact with each other millions of times every day. During these charging activities, a large number of charging failures and even charging accidents occur. Therefore, it is very important to conduct charging compatibility tests on charging piles and electric vehicles. In the current existing technology, charging pile and electric vehicle tests are conducted separately, but in actual applications, there are often compatibility issues between electric vehicles and charging piles. According to traditional practices, two different devices need to be carried for testing, which is inconvenient to carry, the testing process is complicated, and the data cannot be universal. In this case, a device that can test both electric vehicles and DC charging piles is needed to facilitate the compatibility test of electric vehicles and charging piles.

[0004] In the existing published patent applications, invention patent application number CN202210903410.1 discloses a ChaoJi electric vehicle simulator, a ChaoJi charging pile compatibility test method and system, wherein the ChaoJi charging pile compatibility test system includes: a ChaoJi charging interface simulation unit, a battery simulation unit, a DC load unit and a battery management system simulation unit; wherein the ChaoJi charging interface simulation unit is used to simulate the ChaoJi control guidance circuit of the electric vehicle, perform interoperability testing on the ChaoJi charging pile under test, and connect the ChaoJi charging pile under test when testing the ChaoJi charging pile under test; the battery simulation unit includes a rectifier The DC output end of the rectifier is used to simulate the battery voltage characteristics of the electric vehicle, and cooperate with the DC load unit to perform a load test on the electrical performance of the ChaoJi charging pile under test; the DC load unit is connected to the ChaoJi charging interface simulation unit, and is used to simulate the battery load characteristics of the electric vehicle, absorb the DC power output by the ChaoJi charging pile under test, and perform a load test on the electrical performance of the ChaoJi charging pile under test; the battery management system simulation unit is used to simulate the battery management system of the electric vehicle, communicate with the ChaoJi charging pile under test through the ChaoJi charging interface simulation unit, and perform a protocol consistency test on the ChaoJi charging pile under test.

[0005] The above invention patent application still does not provide a charging compatibility testing system for electric vehicles and AC charging piles. Summary of the invention

[0006] The purpose of the present invention is to provide an electric vehicle and DC charging pile charging compatibility test system that can overcome the above-mentioned technical problems, so as to complete the electrical performance, interoperability and protocol consistency compatibility test of the electric vehicle DC charging interface and the DC charging pile.

[0007] The electric vehicle and DC charging pile charging compatibility test system of the present invention comprises a bidirectional DC power supply, a DC pilot circuit simulator, a CAN communication simulator, and a measurement and control system, wherein:

[0008] Bidirectional DC power supply: The electric energy of the bidirectional DC power supply flows in both directions, and cooperates with the DC pilot circuit simulator to form a DC charging pile to test the interoperability of the DC charging interface of electric vehicles;

[0009] DC pilot circuit simulator: It integrates the DC charging pile control pilot loop and the electric vehicle DC charging control pilot loop. The DC pilot circuit simulator can perform both DC charging pile interoperability tests and electric vehicle DC interoperability tests. The DC pilot circuit simulator is equipped with an electric vehicle charging interface and a charging pile charging interface to directly connect the electric vehicle to the DC charging pile.

[0010] CAN communication simulator: It can simulate the BMS simulation software of electric vehicles, communicate with the DC charging pile under test through the CAN interface, simulate the battery pack demand status and communication failure through the CAN communication simulator, and simulate the communication between the DC charging pile and the BMS of the electric vehicle under test, as well as test the protocol consistency function;

[0011] Measurement and control system: used to collect voltage, current, CC1, CC2, and CAN communication signals during the test of the electric vehicle and DC charging pile charging compatibility test system, providing 8 recording channels, and the sampling rate of all recording channels is ≥10kSa / s.

[0012] Furthermore, the bidirectional DC power supply is a four-quadrant DC power supply.

[0013] Furthermore, the bidirectional DC power supply can simulate a DC load and cooperate with a DC steering circuit simulator to test the interoperability performance of a DC charging pile.

[0014] Furthermore, the bidirectional DC power supply parameters are: input AC three-phase 380V, output DC voltage range 0-1000V, power range 0-250kW.

[0015] Furthermore, the DC steering circuit simulator uses an electronic potentiometer to adjust the resistance of the control steering resistors R3 and R4, with a variation range of 500-2000Ω and an adjustment step of 0.1Ω.

[0016] Furthermore, the DC steering circuit simulator is provided with an insulation simulation circuit, which uses an electronic potentiometer to simulate an insulation fault of 10k-600kΩ, with an adjustment step of 0.1kΩ, and simulates the ground faults of DC+, DC-, S+, S-, CC1, CC2, A+ and A- respectively by switching switches.

[0017] Further, when the DC steering circuit simulator is testing an electric vehicle, the circuit of the DC steering circuit simulator is switched to a circuit simulating a DC charging pile; when the DC charging pile is testing, the circuit of the DC steering circuit simulator is switched to a circuit simulating an electric vehicle;

[0018] Furthermore, the DC steering circuit simulator is matched with charging compatibility host computer test software to realize the test of electric vehicles or DC charging piles, and can be connected to electric vehicles or charging piles to perform different test contents in different time periods.

[0019] Furthermore, the measurement and control system can control the DC power supply, the DC pilot circuit simulator, and the CAN communication simulator through TCP, Modbus and other communications.

[0020] Furthermore, the measurement and control system performs FIR median filtering on the channel waveform data to be analyzed and processed through a built-in complete routine electrical performance test, conduction interoperability test and protocol consistency test program, and optimizes the cursor search algorithm: preset the start and end time of the cursor position search, preset the upper and lower limits of the channel waveform data, preset the search cursor direction, search the upper and lower limits of the waveform data and the actual waveform overlapping area from left to right or from right to left, search for the cursor position that meets the conditions, that is, the nearby points inside / outside the overlapping area, call hardware functions and own logic functions to complete the timing control of the integrated hardware.

[0021] The superior technical effects of the present invention are:

[0022] 1. The electric vehicle and DC charging pile charging compatibility test system is used to perform compatibility test of DC charging piles and electric vehicle DC charging interfaces, integrating electric vehicle testing and DC charging pile testing into one system with highly integrated functions.

[0023] 2. The electric vehicle and DC charging pile charging compatibility test system realizes that the electric vehicle test data and the charging pile test data are from the same source, which is convenient for unified comparative analysis.

[0024] 3. The electric vehicle and DC charging pile charging compatibility test system effectively reduces the construction cost of the test system and has high equipment reuse.

[0025] 4. The circuit structure diagram of the electric vehicle and DC charging pile charging compatibility test system designed by the present invention shows that the actual use shows that the electric vehicle and DC charging pile charging compatibility test is simple and practical to operate and has wide promotion and use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the DC charging pile topology structure of the electric vehicle and DC charging pile charging compatibility test system of the present invention, wherein the arrows indicate a schematic diagram of energy flow;

[0027] Figure 2 A schematic diagram of the DC electric vehicle topology structure of the electric vehicle and DC charging pile charging compatibility test system of the present invention, wherein the arrows in the figure indicate a schematic diagram of energy flow;

[0028] Figure 3 This is an electrical structure diagram of a DC pilot circuit simulator used in the electric vehicle and DC charging pile charging compatibility test system of the present invention. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0030] Example

[0031] like Figure 1-2 As shown, the electric vehicle and DC charging pile charging compatibility test system of the present invention includes: a bidirectional DC power supply, a DC pilot circuit simulator, a CAN communication simulator, and a measurement and control system, wherein:

[0032] Bidirectional DC power supply: The electric energy of the bidirectional DC power supply flows in both directions, and cooperates with the DC pilot circuit simulator to form a DC charging pile to test the interoperability of the DC charging interface of electric vehicles;

[0033] DC pilot circuit simulator: It integrates the DC charging pile control pilot loop and the electric vehicle DC charging control pilot loop. The DC pilot circuit simulator can perform both DC charging pile interoperability tests and electric vehicle DC interoperability tests. The DC pilot circuit simulator is equipped with an electric vehicle charging interface and a charging pile charging interface to directly connect the electric vehicle to the DC charging pile.

[0034] CAN communication simulator: It can simulate the BMS simulation software of electric vehicles, communicate with the DC charging pile under test through the CAN interface, simulate the battery pack demand status and communication failure through the CAN communication simulator, and simulate the communication between the DC charging pile and the BMS of the electric vehicle under test, as well as test the protocol consistency function.

[0035] Measurement and control system: used to collect voltage, current, CC1, CC2, and CAN communication signals during the test of the electric vehicle and DC charging pile charging compatibility test system, providing 8 recording channels, and the sampling rate of all recording channels is ≥10kSa / s.

[0036] As a specific embodiment of a structure of the present invention: the bidirectional DC power supply is a four-quadrant DC power supply.

[0037] As a specific embodiment of a structure of the present invention: the bidirectional DC power supply can simulate a DC load and cooperate with a DC steering circuit simulator to test the interoperability performance of a DC charging pile.

[0038] As a specific embodiment of a structure of the present invention: the parameters of the bidirectional DC power supply are: input AC three-phase 380V, output DC voltage range 0-1000V, power range 0-250kW.

[0039] As a specific embodiment of a structure of the present invention: the DC steering circuit simulator uses an electronic potentiometer to adjust the resistance value of the control steering resistors R3 and R4, with a variation range of 500-2000Ω and an adjustment step of 0.1Ω.

[0040] As a specific embodiment of a structure of the present invention: the DC steering circuit simulator is provided with an insulation simulation circuit, and an electronic potentiometer is used to simulate an insulation fault of 10k-600kΩ, with an adjustment step of 0.1kΩ, and the ground faults of DC+, DC-, S+, S-, CC1, CC2, A+ and A- are simulated respectively by switching switches.

[0041] As a specific embodiment of a structure of the present invention: when the DC steering circuit simulator is testing an electric vehicle, the circuit of the DC steering circuit simulator is switched to a circuit simulating a DC charging pile; when the DC charging pile is testing, the circuit of the DC steering circuit simulator is switched to a circuit simulating an electric vehicle;

[0042] As a specific embodiment of a structure of the present invention: the DC steering circuit simulator is matched with the charging compatibility host computer test software to realize the test of electric vehicles or DC charging piles, and can simultaneously connect to electric vehicles and charging piles to perform different test contents in different time periods.

[0043] As a specific embodiment of a structure of the present invention: the measurement and control system can control the DC power supply, the DC pilot circuit simulator, and the CAN communication simulator through TCP, Modbus and other communications;

[0044] As a specific embodiment of a structure of the present invention: the measurement and control system performs FIR median filtering on the channel waveform data to be analyzed and processed through a built-in complete routine electrical performance test, conduction interoperability test and protocol consistency test program, and optimizes the cursor search algorithm:

[0045] That is, by presetting the start and end time of the search cursor position, presetting the upper and lower limits of the channel waveform data, and presetting the search cursor direction from left to right / from right to left, the upper and lower limits of the waveform data and the actual waveform overlapping area are searched, and the cursor position that meets the conditions is searched, that is, the nearby points inside / outside the overlapping area, and the hardware functions and the own logic functions are called to complete the timing control of the integrated hardware.

[0046] Below, combined with the instructions attached Figure 3The working principle and operation method of the circuit structure diagram of the electric vehicle and DC charging pile charging compatibility test system of the present invention are briefly introduced.

[0047] like Figure 3 As shown, where:

[0048] F1 is the socket interface for DC charging pile testing:

[0049] R6 and R7 are used to simulate the insulation abnormality and insulation fault resistance value during the DC charging pile insulation self-test process;

[0050] K-DC+ and K-DC- switches are used to simulate the switching of insulation abnormalities and insulation fault resistance values;

[0051] The K1 / K2 switch is used to simulate the DC contactor action of the DC charging pile K1 / K2;

[0052] The K5 / K6 switch is used to simulate the DC contactor action of the electric vehicle K5 / K6;

[0053] Diode D1 is used to simulate the output of the DC charging pile charging module electronic device;

[0054] Switch K-PE is used to simulate PE disconnection test in DC charging pile test;

[0055] R4 is used to test the change of R4 control guide voltage limit in DC charging pile test;

[0056] Switch K-R4 is used to control the switching action of the R4 resistor in the DC charging pile test;

[0057] Switch K-CC1 is used for CC1 disconnection simulation in DC charging pile test and electric vehicle test;

[0058] The 12V power supply, R5, and K-R5 loop are used to simulate the CC2 signal in the DC charging pile test;

[0059] The 12V power supply, resistors R1 and R2, switches K-R1 and K-R2 loops are used to simulate CC1 signals in electric vehicle testing;

[0060] Resistor R3 and switch K-R3 are used to simulate CC2 signal in electric vehicle testing;

[0061] Switch K-CC2 is used for CC2 disconnection simulation in DC charging pile test and electric vehicle test;

[0062] Switches K-S+ and KS- are used to simulate the physical disconnection of CAN communication in the DC charging pile test;

[0063] The 12V power supply, switches K3 and K4 are used to simulate the internal auxiliary power supply of the DC charging pile in the electric vehicle test;

[0064] 12V, switch K-DSP loop generates DSP trigger signal, which is used to mark the time of emergency events set in the software during the DC charging pile or electric vehicle test process, and calculate the time difference of events occurring at different times through the oscilloscope waveform display;

[0065] F2 is the acquisition interface of the internal signal of the DC charging pile during the test process:

[0066] The collected signals are isolated and conditioned to be converted into the signal type that the oscilloscope can receive. The oscilloscope displays each waveform, which is stored in the waveform chart and finally displayed in the test report for reporting data / waveform traceability;

[0067] F3 is a high voltage DC interface:

[0068] Some functions of the voltage detection device: can collect DC charging voltage for data comparison or calibration through a third-party voltage collection device;

[0069] Function of connecting to DC power supply: During the electric vehicle test, a DC voltage output simulating a DC charging pile is required. This interface is used for voltage input of the charging module. This part is a wiring interface.

[0070] Connecting to DC load part function: During the DC charging pile test, it is necessary to simulate the charging of electric vehicles. According to different voltage and current requirements to meet the test requirements, this test function can be achieved through resistance load simulation. This part is the wiring interface;

[0071] Connect to the battery voltage simulator function: During the DC charging pile test, it is necessary to simulate the battery voltage of the electric vehicle, and cooperate with the DC charging pile for pre-charging to finally realize charging. This part is the wiring interface;

[0072] F4 is the panel measurement point of the internal analog resistance of the device:

[0073] Test point for checking the switching value of insulation resistance R6 and R7;

[0074] Test point for checking the switching values ​​of resistors R3 and R4;

[0075] Voltage measurement point for checking 12V power supply output;

[0076] Used to check the CC1 and CC2 control pilot voltage value measurement points;

[0077] F5 is the device power supply and communication interface:

[0078] The power supply is 220VAC, and the communication interfaces include RS485, TCP, and DB9;

[0079] F6 is the signal output terminal for DC charging pile test or electric vehicle test, which is displayed by oscilloscope, recorder and other equipment:

[0080] Such as CC1, CC2, DC voltage, and DC current signal waveforms of DC charging pile tests;

[0081] Such as CC1, CC2, DC voltage, and DC current signal waveforms of DC electric vehicles;

[0082] For example, the emergency event time mark set inside the software during the test process is used to calculate the time difference between events occurring at different times.

[0083] The present invention is fully capable of realizing the electrical performance, interoperability and compatibility testing of electric vehicle DC charging and DC charging piles. The system:

[0084] 1. A bidirectional DC power supply is used, which can work in power mode and DC load mode. When testing the interoperability and protocol consistency of the DC charging interface of electric vehicles, the DC power supply works in power mode and cooperates with the DC pilot circuit simulator and CAN communication simulator to simulate the DC charging pile, forming a system for testing electric vehicles; when testing the DC charging pile, the DC power supply works in DC load mode and cooperates with the DC pilot circuit simulator and CAN communication simulator to simulate the electric vehicle, forming a DC charging pile test system;

[0085] 2. DC pilot circuit simulator, which integrates the DC charging pile control pilot loop and the electric vehicle DC charging control pilot loop. The simulator can carry out interoperability performance tests of DC charging piles and DC interoperability tests of electric vehicles;

[0086] 3. The CAN communication simulator uses an electronic potentiometer to simulate the control of the guide resistors R3 and R4. The adjustment range is 500-2000Ω and the step length is 0.1Ω, so as to achieve compatibility with various charging piles and electric vehicles on the market;

[0087] 4. The system also includes a measurement and control system: it is used to collect voltage, current, CC1, CC2, CAN and other signals during the test, and provides 8 recording channels. In order to avoid the uneven quality of charging piles causing different degrees of interference in the output waveform during the test, resulting in inaccurate time cursor or misjudgment, FIR filtering is performed through software to optimize the cursor search algorithm (such as the beginning, end, trigger point) to solve this problem.

[0088] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the scope disclosed in the present invention should be covered by the protection scope of the claims of the present invention.

Claims

1. A charging compatibility test system for electric vehicles and DC charging piles, characterized in that: It includes a bidirectional DC power supply, a DC pilot circuit simulator, a CAN communication simulator, and a measurement and control system, among which: Bidirectional DC power supply: The electric energy of the bidirectional DC power supply flows in both directions, and cooperates with the DC pilot circuit simulator to form a DC charging pile to test the interoperability of the DC charging interface of electric vehicles; DC pilot circuit simulator: It integrates the DC charging pile control pilot loop and the electric vehicle DC charging control pilot loop. The DC pilot circuit simulator can perform both DC charging pile interoperability tests and electric vehicle DC interoperability tests. The DC pilot circuit simulator is equipped with an electric vehicle charging interface and a charging pile charging interface to directly connect the electric vehicle to the DC charging pile. CAN communication simulator: It can simulate the BMS simulation software of electric vehicles, communicate with the DC charging pile under test through the CAN interface, simulate the battery pack demand status and communication failure through the CAN communication simulator, and simulate the communication between the DC charging pile and the BMS of the electric vehicle under test, as well as test protocol consistency; Measurement and control system: used to collect voltage, current, CC1, CC2, and CAN communication signals during the test of the electric vehicle and DC charging pile charging compatibility test system, providing 8 recording channels, and the sampling rate of all recording channels is ≥10kSa / s.

2. The electric vehicle and DC charging pile charging compatibility test system according to claim 1, characterized in that: The bidirectional DC power supply is a four-quadrant DC power supply.

3. The electric vehicle and DC charging pile charging compatibility test system according to claim 1 is characterized in that: The bidirectional DC power supply can simulate a DC load and cooperate with a DC steering circuit simulator to test the interoperability performance of a DC charging pile.

4. The electric vehicle and DC charging pile charging compatibility testing system according to claim 1 is characterized in that: The bidirectional DC power supply parameters are: input AC three-phase 380V, output DC voltage range 0-1000V, power range 0-250kW.

5. The electric vehicle and DC charging pile charging compatibility testing system according to claim 1 is characterized in that: The DC steering circuit simulator uses an electronic potentiometer to adjust the resistance of the control steering resistors R3 and R4, with a variation range of 500-2000Ω and an adjustment step of 0.1Ω.

6. The electric vehicle and DC charging pile charging compatibility testing system according to claim 1 is characterized in that: The DC pilot circuit simulator is provided with an insulation simulation loop, which uses an electronic potentiometer to simulate insulation faults of 10k-600kΩ, with an adjustment step of 0.1kΩ, and simulates ground faults of DC+, DC-, S+, S-, CC1, CC2, A+ and A- respectively by switching switches.

7. The electric vehicle and DC charging pile charging compatibility testing system according to claim 1 is characterized in that: When the DC steering circuit simulator is testing an electric vehicle, the circuit of the DC steering circuit simulator is switched to a circuit simulating a DC charging pile; when the DC charging pile is testing, the circuit of the DC steering circuit simulator is switched to a circuit simulating an electric vehicle.

8. The electric vehicle and DC charging pile charging compatibility testing system according to claim 1 is characterized in that: The DC pilot circuit simulator is matched with charging compatibility host computer test software to realize the test of electric vehicles or DC charging piles, and can be connected to electric vehicles or charging piles to perform different test contents in different time periods.

9. The electric vehicle and DC charging pile charging compatibility testing system according to claim 1 is characterized in that: The measurement and control system can control a DC power supply, a DC pilot circuit simulator, and a CAN communication simulator through TCP and Modbus communications.

10. The electric vehicle and DC charging pile charging compatibility testing system according to claim 1, characterized in that: The measurement and control system performs FIR median filtering on the channel waveform data to be analyzed and processed through a built-in complete routine electrical performance test, conduction interoperability test and protocol consistency test program, and optimizes the cursor search algorithm.

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