Safe power supply control system and method for range-extended electric test vehicle

Abstract

A safe power supply control system and method for a range-extended electric test vehicle, relating to the technical field of safe power supply of test vehicles. The system comprises an emergency stop switch (2), the emergency stop switch (2) being arranged on a low-voltage power supply line (1) of a test vehicle; the low-voltage power supply line (1) is used for supplying power to a vehicle control unit (4) and a battery management system (5) of the test vehicle; when being pressed, the emergency stop switch (2) is used for cutting off the power supply of the low-voltage power supply line (1) to the vehicle control unit (4) and the battery management system (5). The emergency stop switch (2) is added between the low-voltage power supply line (1) and the vehicle control unit (4) and the battery management system (5), and the added emergency stop switch (2) is used as a safety protection device; when electricity leakage occurs and power output cannot be cut off by means of signal control, external power supply of a battery pack of the test vehicle can be cut off by means of pressing of the emergency stop switch (2) and a high-voltage interlock strategy, thereby safely and reliably cutting off high-voltage power output, ensuring the safety of testers, and improving the safety and reliability of test vehicles.

Description

Safety power supply control system and method for extended-range electric vehicle test vehicle

[0001] The present disclosure is based on a Chinese patent application with the application date of June 26, 2024, the application number of 202410838761.8, and the invention name of "Safety power supply control system and method for extended-range electric vehicle test vehicle", and claims the priority of the Chinese patent application, the whole content of which is incorporated into the present disclosure as reference. TECHNICAL FIELD

[0002] The present application belongs to the technical field of test vehicle safety power supply, and particularly relates to a safety power supply control system and method for extended-range electric vehicle test vehicle. BACKGROUND

[0003] Compared with traditional vehicles, extended-range electric vehicles increase high-voltage power consumption or power supply equipment such as motors, motor controllers, generators, generator controllers, DC / DC (Direct Current to Direct Current Converter), high-voltage battery packs, compressors, etc., so the safety protection of the whole vehicle high-voltage system is very important. There are industry standards for this part of high-voltage power consumption or power supply equipment in the prior art, which provides that the high-voltage components on the electric vehicle should have a high-voltage interlock device. High-voltage interlock, also known as high-voltage interlock loop (High Voltage Interlock, abbreviated as HVIL), the vehicle detects the integrity and continuity of the entire high-voltage system loop through the high-voltage interlock, and can timely disconnect the control electrical devices of the high-voltage input end.

[0004] Before being put into the market, vehicles generally need to be tested multiple times, and test vehicles are used for multiple tests during the test process. The extended-range electric vehicle test vehicle uses a high-voltage battery pack for power supply, and once a leakage problem occurs during the test process, it may endanger the safety of the test personnel. SUMMARY

[0005] In order to overcome the shortcomings of the prior art, the present application provides a safety power supply control system and method for extended-range electric vehicle test vehicle, which can well solve the high-voltage leakage problem that may exist during the test of the extended-range electric vehicle test vehicle, and the power output out-of-control problem caused by the immaturity of the test vehicle software system, greatly improving the safety and reliability of the test vehicle.

[0006] To achieve the above object, the first aspect of the present application provides a safe power supply control system for a range-extended electric vehicle test vehicle, which comprises an emergency stop switch arranged on a low-voltage power supply line of the test vehicle, the low-voltage power supply line being used for supplying power to a vehicle controller and a battery management system of the test vehicle, and the emergency stop switch being used for cutting off the power supply of the low-voltage power supply line to the vehicle controller and the battery management system when being pressed.

[0007] In some embodiments, the vehicle controller is configured to acquire a low-frequency voltage signal of the low-voltage power supply line, and control the test vehicle to be powered off under high voltage in a case where it is determined that the low-frequency voltage signal is abnormal.

[0008] In some embodiments, the vehicle controller is signal-connected with a motor controller and a generator controller of the test vehicle respectively, the motor controller is signal-connected with a motor of the test vehicle, and the generator controller is signal-connected with a generator of the test vehicle.

[0009] In some embodiments, the vehicle controller is further configured to control the motor controller and the generator controller to work normally in a case where it is determined that the low-frequency voltage signal is normal.

[0010] In some embodiments, the battery management system is configured to acquire a low-frequency voltage signal of the low-voltage power supply line, and disconnect a battery pack relay of the test vehicle to cut off the connection between a power battery of the test vehicle and a high-voltage wire harness of the test vehicle in a case where it is determined that the low-frequency voltage signal is abnormal.

[0011] In some embodiments, the battery management system is further configured to maintain the closed state of the battery pack relay to maintain the connection between the power battery and the high-voltage wire harness in a case where it is determined that the low-frequency voltage signal is normal.

[0012] In some embodiments, the low-voltage power supply line is further configured to supply power to an engine management system of the test vehicle, and the vehicle controller, the battery management system and the engine management system are arranged downstream of the emergency stop switch.

[0013] In some embodiments, a key switch KL15 is further arranged on the low-voltage power supply line, the key switch KL15 is arranged upstream of the emergency stop switch, and the key switch KL15 is configured to control the power supply of the low-voltage power supply line.

[0014] The second aspect of the present application provides a safe power supply control method for a range-extended electric vehicle test vehicle, which comprises the following steps:

[0015] In a case that the test vehicle is working and the emergency stop switch of the test vehicle is switched from a closed state to an open state, the vehicle controller of the test vehicle acquires a low-frequency voltage signal of a low-voltage power supply line of the test vehicle, controls the motor controller and the generator controller of the test vehicle to stop working in a case that it is determined that the low-frequency voltage signal is abnormal, and controls the motor and the generator of the test vehicle to stop working respectively.

[0016] In a case that the test vehicle is working and the emergency stop switch of the test vehicle is switched from a closed state to an open state, the battery management system of the test vehicle acquires a low-frequency voltage signal of a low-voltage power supply line, and disconnects the battery pack relay of the test vehicle to cut off the connection between the power battery of the test vehicle and the high-voltage wire harness of the test vehicle in a case that it is determined that the low-frequency voltage signal is abnormal.

[0017] In some embodiments, the method further comprises:

[0018] In a case that the test vehicle is started and the emergency stop switch is in an open state, the emergency stop switch disconnects the low-voltage power supply line, and the vehicle controller determines that the low-frequency voltage signal is abnormal in a case that it does not receive the low-frequency voltage signal, and the vehicle controller no longer performs the preparation operation and no longer high-voltage powers on;

[0019] In a case that the test vehicle is started and the emergency stop switch is in an open state, the emergency stop switch disconnects the interlock line of the high-voltage line of the test vehicle, and the battery management system determines that the low-frequency voltage signal is abnormal in a case that it does not receive the low-frequency voltage signal returned by the interlock line, and the vehicle controller no longer performs the preparation operation and no longer high-voltage powers on.

[0020] The above one or more technical solutions have the following beneficial effects:

[0021] The application provides a safety power supply control system of a range-extended electric vehicle test vehicle, aiming at the high-voltage leakage of the range-extended electric vehicle test vehicle during the test, and the power output out of control of the signal control mode caused by the immature software system of the test vehicle, the safety power supply control system adds an emergency stop switch on the low-voltage power supply line according to the actual situation of the test vehicle, and the opening or closing of the emergency stop switch can make the vehicle controller recognize the change of the state of the low-voltage power supply line, and then control the high-voltage power-on or power-off of the test vehicle, so that in the case of high-voltage leakage or power output out of control of the signal control of the test vehicle, the test vehicle can be quickly powered off by pressing the emergency stop switch, and the safety of the test vehicle is ensured. Moreover, the battery management system of the test vehicle can also identify the state of the low-voltage power supply line, and then control whether to cut off the connection between the power battery and the high-voltage wire harness, so that in the case of problems in the whole high-voltage system loop, the control electrical devices of the high-voltage input end can be disconnected in time, and the safety of the test vehicle is ensured.

[0022] The application has simple logic, can quickly control the battery pack to stop power supply and cut off the power output without changing the original connection line of the test vehicle, has low cost, reliable result, improves the safety of the test vehicle, and can well ensure the safety of the test personnel when the test vehicle is in danger. BRIEF DESCRIPTION OF DRAWINGS

[0023] The description and the accompanying drawings of the specification part of the application are used to provide further understanding of the application, the illustrative embodiments of the application and the description thereof are used to explain the application, and do not constitute improper limitation on the application.

[0024] Fig. 1 is a system structure diagram of the first embodiment.

[0025] In the drawings, the component list represented by each reference numeral is as follows:

[0026] 1 low-voltage power supply line, 2 emergency stop switch, 3 engine management system (EMS), 4 vehicle controller (VCU), 5 battery management system (BMS), 6 motor controller (MCU), 7 generator controller (GCU), 8 key switch KL15. DETAILED DESCRIPTION

[0027] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0028] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application.

[0029] The embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0030] Generally, a vehicle needs to be tested several times before it is put on the market, and a test vehicle is used for testing several times during the testing process. The extended-range electric vehicle test vehicle uses a high-voltage battery pack for power supply, and once a leakage problem occurs during the testing process, it may endanger the safety of the test personnel, including the following problems.

[0031] 1. The extended-range electric vehicle uses a high-voltage battery pack for power supply, and its voltage can be as high as about 400V. The test vehicle may have a leakage phenomenon, and once the leakage occurs, it is very likely to endanger the safety of the test personnel.

[0032] 2. Compared with the traditional fuel vehicle, the power output control of the extended-range electric vehicle adopts signal control, and cannot be cut off by mechanical means. In addition, the software system of the test vehicle is not mature and has errors. Once the software system has a problem, the test personnel will fail to operate the extended-range electric vehicle test vehicle to stop, which will lead to the loss of control of the test vehicle and also endanger the safety of the test personnel.

[0033] Therefore, the embodiments of the present application provide an extended-range electric vehicle test vehicle safety power supply control system and method to solve the above problems.

[0034] Embodiment one

[0035] The present application provides a solution to the high-voltage leakage problem that may exist during the testing of the extended-range electric vehicle test vehicle, and the power output control problem caused by the immaturity of the software system of the test vehicle, by adding an emergency stop switch 2 between the low-voltage power supply circuit and the engine management system 3, the vehicle controller 4 and the battery management system 5. The added emergency stop switch 2 is used as a safety protection device. In the case of leakage and power output that cannot be cut off by signal control, the emergency stop switch 2 can be pressed to cut off the power supply of the battery pack to the outside, and the high-voltage interlocking strategy is combined to achieve safe and reliable cutting off of the high-voltage power output, so as to ensure the safety of the test personnel and improve the safety and reliability of the test vehicle.

[0036] Please refer to FIG. 1, which is a connection relationship diagram of the extended-range electric vehicle test vehicle safety power supply control system provided by the present application.

[0037] As a specific embodiment provided in the present application, the safety power supply control system of the extended-range electric vehicle test vehicle includes an emergency stop switch 2, which is arranged on a low-voltage power supply line 1 of the test vehicle, the low-voltage power supply line 1 is used to supply power to a vehicle controller 4 and a battery management system 5 of the test vehicle respectively, and the emergency stop switch 2 is used to cut off the power supply of the vehicle controller 4 and the battery management system 5 of the low-voltage power supply line 1 when being pressed.

[0038] A first end of the low-voltage power supply line 1 is electrically connected with a low-voltage power supply, and a second end of the low-voltage power supply line 1 is electrically connected with the vehicle controller 4 and the battery management system 5 respectively.

[0039] Among them, the low-voltage power supply line and the high-voltage power supply line are respectively arranged on the test vehicle. The voltage on the low-voltage power supply line is generally lower than the voltage on the high-voltage power supply line. For example, the voltage on the low-voltage power supply line is generally 12V or 24V, and the voltage on the high-voltage power supply line is generally 60V. The low-voltage power supply line is mainly used to supply power to low-voltage components on the test vehicle, such as audio components, lighting components, etc.

[0040] The high-voltage power supply line is mainly used to supply power to high-voltage components on the test vehicle, such as electric motors, high-voltage controllers, etc.

[0041] By adding the emergency stop switch 2 on the test vehicle, the emergency stop switch 2 is arranged on the low-voltage power supply line 1 connected with the vehicle controller 4 and the battery management system 5. In the case of leakage and power output cannot be cut off by signal control, the emergency stop switch 2 can be pressed to cut off the power supply of the battery pack, further ensure the personal safety of the test personnel on the test vehicle, and improve the reliability of the test vehicle.

[0042] (1) The above-mentioned vehicle controller 4 performs a logic judgment process for safety power supply of the extended-range electric vehicle test vehicle, including:

[0043] The vehicle controller 4 acquires a low-frequency voltage signal of the low-voltage power supply line 1, and controls the test vehicle to be powered off under high voltage in the case that the low-frequency voltage signal is determined to be abnormal.

[0044] The vehicle controller 4 also controls the motor controller 6 and the generator controller 7 to work normally in the case that the low-frequency voltage signal is determined to be normal.

[0045] Among them, the vehicle controller 4 is signal connected with the motor controller 6 and the generator controller 7 of the test vehicle respectively, the motor controller 6 is signal connected with the motor of the test vehicle, and the generator controller 7 is signal connected with the generator of the test vehicle. The motor controller 6 controls the operation of the motor, and the generator controller 7 controls the operation of the generator.

[0046] The above-mentioned emergency stop switch 2 is connected with the vehicle controller 4 through the low-voltage power supply circuit 1, and can trigger the low-voltage protection function of the test vehicle. Among them, the vehicle controller 4 judges the state of the low-voltage power supply circuit 1 through the feedback of the low-frequency voltage signal, that is, whether the low-voltage loop is abnormal. Among them, the low-voltage power supply circuit 1 is connected with the main controller and the vehicle controller 4 of the test vehicle to form a low-voltage loop.

[0047] When the low-voltage loop is short-circuited, interrupted or the controller is abnormal, the low-frequency voltage signal will be interrupted or the signal frequency will change. The vehicle controller 4 will determine that the test vehicle is abnormal according to this, determine that the current condition affects the driving safety, and then send a signal for controlling the test vehicle to no longer perform the preparation operation or to power off the high voltage of the vehicle.

[0048] In this embodiment, after the emergency stop switch 2 is added, when the test personnel press the emergency stop switch 2 during the operation of the test vehicle, the low-voltage loop will be in an open circuit state, at this time the low-frequency voltage signal in the low-voltage power supply circuit 1 will be interrupted, and the vehicle controller 4 cannot continue to obtain the low-frequency voltage signal, so the vehicle controller 4 determines that the current abnormal condition occurs, and then powers off the high voltage of the test vehicle. High voltage power off refers to disconnecting the main relay in the high voltage system to disconnect the high voltage circuit.

[0049] After the high voltage of the vehicle is powered off, the vehicle controller 4 controls the motor controller 6 and the generator controller 7 connected with it, so that the motor controller 6 and the generator controller stop controlling the motor and the generator to continue running, thereby effectively cutting off the power output of the test vehicle.

[0050] (2) The logic judgment process of the above-mentioned battery management system 5 for safe power supply of the extended-range electric vehicle test vehicle, comprising:

[0051] The battery management system 5 obtains the low-frequency voltage signal of the low-voltage power supply circuit 1, and disconnects the battery pack relay of the test vehicle to cut off the connection between the power battery of the test vehicle and the high-voltage wire harness under the condition that the low-frequency voltage signal is determined to be abnormal;

[0052] The battery management system 5 maintains the closed state of the battery pack relay to maintain the connection between the power battery and the high-voltage wire harness under the condition that the low-frequency voltage signal is determined to be normal.

[0053] The logic judgment process of the above-mentioned battery management system 5 for safe power supply of the extended-range electric vehicle test vehicle is similar to that of the vehicle controller 4. The emergency stop switch 2 is connected with the battery management system 5 through the low-voltage power supply circuit 1, and triggers the high-voltage protection function of the test vehicle, that is, under the condition that the low-voltage loop is abnormal, the connection between the power battery of the test vehicle and the high-voltage wire harness can be cut off in time to stop the power battery from outputting electric energy.

[0054] In addition, the battery management system 5 in the embodiment is still provided with a high-voltage interlock line, and whether there is a fault such as poor plugging in the high-voltage line is detected by using the high-voltage interlock line. Each connector in the high-voltage line has an interlock socket and a short pin, and the battery management system 5 sends out a low-frequency voltage signal to the outside. In the normal state, the signal returns to the battery management system 5 after passing through the interlock line of all high-voltage wire harness connectors.

[0055] The battery management system 5 thus monitors the state of the high-voltage line. In the case where the signal is not received, the battery management system 5 determines that the high-voltage connector of the vehicle is artificially pulled out or there is a case of poor plugging. At this time, the vehicle is in a dangerous situation, so it enters a self-protection state, the SOC (State of Charge, the ratio of the remaining capacity of the battery to the fully charged capacity) signal sent to the outside is 0, indicating that the battery cannot supply power to the outside at present, and a signal is sent to separate the relay inside the battery, thereby cutting off the high-voltage output.

[0056] Therefore, in the embodiment, the battery management system 5 can perform loop signal detection based on the two detection modes of the emergency stop switch 2 and the high-voltage interlock line, so as to cut off the power output of the high-voltage battery pack in time based on the detection result.

[0057] In the embodiment, after the emergency stop switch 2 is added, when the emergency stop switch 2 is pressed by the test personnel during the operation of the test vehicle, the battery management system 5 determines that the power-off condition occurs. At this time, the low-frequency voltage signal will be lost, so it enters a self-protection state, sends a signal with SOC of 0, and then disconnects the battery pack relay to cut off the connection between the battery and the high-voltage wire harness. In this way, when the high-voltage power battery leakage occurs, the risk caused by this problem can be effectively avoided by pressing the emergency stop switch 2, and the personal safety of the test personnel and the reliability of the test vehicle are improved.

[0058] Considering the situation of the oil-electric hybrid test vehicle, the low-voltage power supply line 1 in the embodiment is also used to supply power to the engine management system 3. Specifically, the second end of the low-voltage power supply line 1 is also electrically connected with the engine management system 3, so as to facilitate the expansion of the applicable types of test vehicles.

[0059] The detection principle of the engine management system 3 is the same as that of the above-mentioned vehicle controller 4 and battery management system 5. That is, the low-frequency voltage signal of the low-voltage power supply line 1 is obtained. In the case where it is determined that the low-frequency voltage signal is abnormal, the engine of the test vehicle is controlled to stop working and cut off the power output. In the case where it is determined that the low-frequency voltage signal is not abnormal, the engine of the test vehicle is controlled to continue normal working.

[0060] Wherein, the vehicle controller 4, the battery management system 5 and the engine management system 3 in the embodiment are all arranged at the downstream position of the emergency stop switch 2, so that the emergency stop switch 2 can effectively control the vehicle controller 4, the battery management system 5 and the engine management system 3; the key switch KL158 is further arranged on the low-voltage power supply circuit 1, and the key switch KL158 is arranged at the upstream position of the emergency stop switch 2, and the key switch KL158 is used for controlling the power supply of the low-voltage power supply circuit. When the key switch KL158 is turned to the ON position, the key switch KL158 is closed, and the low-voltage power supply supplies power to the vehicle controller 4, the battery management system 5 and the engine management system 3 through the low-voltage power supply circuit 1.

[0061] Working principle:

[0062] 1. When the vehicle starts:

[0063] When the vehicle starts, the vehicle will perform an ignition check, at this time the emergency stop switch 2 is in an open state, and the low-voltage circuit is in an open circuit, so that the vehicle controller 4 cannot normally receive the low-frequency voltage signal; at the same time, the interlocking line of the high-voltage line is also in an open state, and the low-frequency voltage signal cannot be returned to the controller of the battery management system through the high-voltage interlocking line, resulting in a high-voltage interlocking detection failure, and the battery management system determines that the battery is faulty or out of power, and sends a signal that the SOC is 0. These two abnormal signals will cause the vehicle controller 4 to be unable to perform the preparation operation and the high voltage to be unable to power on.

[0064] 2. When the vehicle works:

[0065] When the vehicle works, the emergency stop switch 2 is switched to an open state, and the low-frequency voltage signal fed back to the vehicle controller 4 by the main controller of the vehicle will be interrupted, and the vehicle controller 4 will determine that the circuit of the vehicle is abnormal, and then send a signal to power off the high voltage of the vehicle.

[0066] At the same time, the battery management system 5 will lose the low-frequency voltage signal when it is powered off, and enter a self-protection state, at this time, a signal that the SOC is 0 is sent, and the battery pack relay is opened to cut off the connection between the battery and the high-voltage wire harness.

[0067] By opening or closing the emergency stop switch 2, the vehicle controller can recognize that the state of the low-voltage power supply circuit has changed, thereby controlling the high-voltage power-on or power-off of the test vehicle, and in the case of high-voltage leakage or signal control power output out of control of the test vehicle, the test vehicle can be quickly powered off by pressing the emergency stop switch, thereby ensuring the safety of the test vehicle. Moreover, the battery management system 5 can also identify the state of the low-voltage power supply circuit, and then control whether to cut off the connection between the battery and the high-voltage wire harness. Through the above scheme, the purpose of quickly controlling the battery pack power supply or stopping and cutting off the power output is achieved, so as to ensure the safety of the test personnel in case of danger.

[0068] Embodiment Two

[0069] The embodiment discloses a safety power supply control method for a range-extended electric vehicle test vehicle, and the method comprises the following steps:

[0070] In the case that the test vehicle is working and the emergency stop switch 2 of the test vehicle is switched from the closed state to the open state, the vehicle controller 4 of the test vehicle acquires the low-frequency voltage signal of the low-voltage power supply circuit 1, and in the case that it is determined that the low-frequency voltage signal is abnormal, the test vehicle is controlled to be powered off, and the motor controller 6 and the generator controller 7 are respectively controlled to stop the motor and the generator of the test vehicle from working.

[0071] In the case that the test vehicle is working and the emergency stop switch 2 of the test vehicle is switched from the closed state to the open state, the battery management system 5 acquires the low-frequency voltage signal of the low-voltage power supply circuit 1, and in the case that it is determined that the low-frequency voltage signal is abnormal, the battery pack relay of the test vehicle is disconnected to cut off the connection between the power battery and the high-voltage wire harness, so that the power battery of the test vehicle stops outputting electric energy.

[0072] Further, in the case that the test vehicle is started and the emergency stop switch 2 is in the open state, the emergency stop switch 2 disconnects the low-voltage power supply circuit 1, and in the case that the vehicle controller 4 does not receive the low-frequency voltage signal, it is determined that the low-frequency voltage signal is abnormal, and the vehicle controller 4 no longer performs the preparation operation and no longer powers on the high voltage.

[0073] In the case that the test vehicle is started and the emergency stop switch is in the open state, the emergency stop switch disconnects the interlocking line of the high-voltage line of the test vehicle, and in the case that the battery management system 5 does not receive the low-frequency voltage signal returned by the interlocking line, it is determined that the low-frequency voltage signal is abnormal, and the vehicle controller 4 cannot perform the preparation operation and cannot power on the high voltage. In this case, since the low-frequency voltage signal cannot be returned to the battery management system 5 through the interlocking line of the high-voltage line, the battery management system 5 cannot receive the low-frequency voltage signal returned by the interlocking line.

[0074] The application provides a safety power supply control system of a range-extended electric vehicle test vehicle, aiming at the high-voltage leakage of the range-extended electric vehicle test vehicle during the test, and the power output out of control of the signal control mode caused by the immature software system of the test vehicle, an emergency stop switch is additionally arranged on the low-voltage power supply circuit, the opening or closing of the emergency stop switch can make the vehicle controller recognize the change of the state of the low-voltage power supply circuit, and then control the high-voltage power-on or power-off of the test vehicle, so that in the case of high-voltage leakage or power output out of control of the signal control of the test vehicle, the test vehicle can be quickly powered off by pressing the emergency stop switch, and the safety of the test vehicle is ensured. Moreover, the battery management system of the test vehicle can also identify the state of the low-voltage power supply circuit, and then control whether to cut off the connection between the power battery and the high-voltage wire harness, so that in the case of problems in the whole high-voltage system loop, the control electrical devices of the high-voltage input end can be timely disconnected, and the safety of the test vehicle is ensured.

[0075] The application has simple logic, can achieve the purpose of quickly controlling the battery pack to stop power supply and cut off the power output without changing the original connection circuit of the test vehicle, has low cost, reliable result, improves the safety of the test vehicle, and can well ensure the safety of the test personnel when the test vehicle is in danger.

[0076] Although the specific embodiments of the application are described above with reference to the drawings, the application is not limited to the above description, and various modifications or changes can be made to the application without departing from the scope of the application.

Claims

1. A safety power supply control system for a range-extended electric vehicle test vehicle, wherein, The system includes an emergency stop switch located on the low-voltage power supply line of the test vehicle. The low-voltage power supply line supplies power to the vehicle controller and battery management system of the test vehicle. When pressed, the emergency stop switch disconnects the power supply from the low-voltage power supply line to the vehicle controller and battery management system.

2. The safety power supply control system for the range-extended electric vehicle test vehicle according to claim 1, wherein, The vehicle controller is used to acquire the low-frequency voltage signal of the low-voltage power supply line, and when it is determined that the low-frequency voltage signal is abnormal, it controls the test vehicle to shut down the high voltage.

3. The safety power supply control system for the range-extended electric vehicle test vehicle according to claim 2, wherein, The vehicle controller is connected to the motor controller and generator controller of the test vehicle, respectively. The motor controller is connected to the motor signal of the test vehicle, and the generator controller is connected to the generator signal of the test vehicle.

4. The safety power supply control system for the range-extended electric vehicle test vehicle according to claim 3, wherein, The vehicle controller is also used to control the motor controller and the generator controller to work normally when it is determined that there is no abnormality in the low-frequency voltage signal.

5. The safety power supply control system for the range-extended electric vehicle test vehicle according to claim 1, wherein, The battery management system is used to acquire the low-frequency voltage signal of the low-voltage power supply line. When it is determined that the low-frequency voltage signal is abnormal, the battery pack relay of the test vehicle is disconnected to cut off the connection between the power battery of the test vehicle and the high-voltage wiring harness of the test vehicle.

6. The safety power supply control system for the range-extended electric vehicle test vehicle according to claim 5, wherein, The battery management system is also used to maintain the closed state of the battery pack relay when it is determined that there is no abnormality in the low-frequency voltage signal, so as to maintain the connection between the power battery and the high-voltage harness.

7. The safety power supply control system for the range-extended electric vehicle test vehicle according to claim 1, wherein, The low-voltage power supply line is also used to supply power to the engine management system of the test vehicle; the vehicle controller, the battery management system and the engine management system are all located downstream of the emergency stop switch.

8. The safety power supply control system for the range-extended electric vehicle test vehicle according to claim 1, wherein, The low-voltage power supply line is also equipped with a key switch KL15, which is located upstream of the emergency stop switch. The key switch KL15 is used to control the power supply of the low-voltage power supply line.

9. A safe power supply control method for a range-extended electric vehicle test vehicle, wherein, The method includes: When the test vehicle is working and the emergency stop switch of the test vehicle is switched from closed to open, the vehicle controller of the test vehicle acquires the low-frequency voltage signal of the low-voltage power supply line of the test vehicle. If it is determined that the low-frequency voltage signal is abnormal, it controls the high-voltage power-off of the test vehicle and controls the motor controller and generator controller of the test vehicle to stop the motor and generator of the test vehicle respectively. When the test vehicle is in operation and the emergency stop switch of the test vehicle is switched from closed to open, the battery management system of the test vehicle acquires the low-frequency voltage signal of the low-voltage power supply line. If it is determined that the low-frequency voltage signal is abnormal, the battery pack relay of the test vehicle is disconnected to cut off the connection between the power battery of the test vehicle and the high-voltage wiring harness of the test vehicle.

10. The safe power supply control method for a range-extended electric vehicle test vehicle according to claim 9, wherein, The method further includes: When the test vehicle is started and the emergency stop switch is in the open state, the emergency stop switch disconnects the low-voltage power supply line. If the vehicle controller does not receive a low-frequency voltage signal, it determines that the low-frequency voltage signal is abnormal. The vehicle controller then stops performing preparation operations and stops applying high voltage. When the test vehicle is started and the emergency stop switch is in the open state, the emergency stop switch disconnects the interlocking line of the high-voltage line of the test vehicle. If the battery management system does not receive a low-frequency voltage signal returned by the interlocking line, it determines that the low-frequency voltage signal is abnormal, and the vehicle controller no longer performs the preparation operation and no longer applies high voltage.

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