New energy vehicle high-voltage active discharge control method, device and equipment and storage medium

Abstract

The invention discloses a new energy vehicle high-voltage active discharge control method, device and equipment and a storage medium, and relates to the field of new energy high-voltage control strategies, and the method comprises the steps: controlling an MCU to stop working based on a stop enabling signal sent by a VCU, and controlling a DCDC to stop working based on a lower high-voltage instruction sent by the VCU; the main positive relay and the main negative relay are controlled to be disconnected, the DCDC is controlled to be enabled, and active discharging is carried out to charge the low-voltage storage battery; and controlling the DCDC to stop working according to the voltage of the capacitor in the driving motor system, and ending the active discharge to complete the high-voltage operation. The cost of the vehicle electric control system can be effectively reduced, the active discharge current can be adaptively adjusted according to the active discharge time requirement of the whole vehicle and the DCDC performance, the active discharge performance and the active discharge safety are improved, and the active discharge process is safe and controllable.

Description

Technical Field

[0001] The present application relates to the field of new energy high-voltage control strategies, and specifically to a new energy vehicle high-voltage active discharge control method, device, equipment and storage medium. Background Art

[0002] For the existing high-voltage active discharge control methods for new energy vehicles, see Figure 1 As shown, generally, an active discharge relay, an active discharge resistor and a connecting line are added inside the drive motor system. After the MCU (Motor Control Unit) of the drive motor system receives the active discharge instruction, the active discharge relay K4 is closed, and the high voltage in the high voltage capacitor of the drive motor system is actively discharged through the active discharge resistor R1. The MCU determines whether the active discharge is completed based on the voltage at the capacitor terminal. Figure 1 It is the current mainstream high-voltage active discharge solution architecture, where K1 represents the main negative relay, K2 represents the main positive relay, K3 represents the active discharge relay, K4 represents the active discharge relay, R1 represents the active discharge resistor, R2 represents the active discharge resistor, C1 represents the capacitor in the drive motor system, and M represents the drive motor.

[0003] The current mainstream high-voltage active discharge control method, by adding active discharge circuit-related components inside the drive motor system, is likely to cause an increase in the cost of the electronic control system. The high-voltage active discharge time is long, and the active discharge resistor generates severe heat during active discharge. The vehicle frequently goes up and down in high voltage, and there is a risk of the active discharge resistor heating up and failing, which in turn affects the high-voltage safety of the entire vehicle. Summary of the invention

[0004] The present application provides a high-voltage active discharge control method, device, equipment and storage medium for new energy vehicles, which can effectively reduce the cost of the vehicle's electronic control system, and the active discharge current can be adaptively adjusted according to the active discharge time requirements of the entire vehicle and the DCDC performance, the active discharge performance and active discharge safety are improved, and the active discharge process is safe and controllable.

[0005] In the first aspect, the embodiment of the present application provides a high-voltage active discharge control method for a new energy vehicle, which is implemented based on a high-voltage active discharge solution architecture, and the DCDC for connecting a low-voltage battery in the high-voltage active discharge solution architecture is integrated into a power battery system, and the active discharge relay and active discharge resistor are removed from the drive motor system. The high-voltage active discharge control method for a new energy vehicle includes:

[0006] Based on the stop enable signal sent by the VCU, the MCU is controlled to stop working, and based on the low-voltage instruction sent by the VCU, the DCDC is controlled to stop working;

[0007] Control the main positive relay and the main negative relay to be disconnected, and control the DCDC to be enabled, and perform active discharge to charge the low-voltage battery;

[0008] According to the voltage of the capacitor in the drive motor system, the DCDC is controlled to stop working, and the active discharge is ended to complete the low-voltage operation.

[0009] In combination with the first aspect, in one implementation, the controlling the MCU to stop working based on the stop enable signal sent by the VCU specifically includes:

[0010] When the vehicle is stopped, the VCU determines whether the vehicle meets the lower high-voltage state:

[0011] If not, continue to determine whether the vehicle meets the lower high pressure state;

[0012] If yes, the VCU sends a stop enable signal to the MCU, and determines whether the MCU receives the stop enable signal sent by the VCU;

[0013] -If received, the MCU stops working;

[0014] -If not received, the MCU continues to wait for the stop enable signal sent by the VCU.

[0015] In combination with the first aspect, in one implementation, the step of controlling the DCDC to stop working based on the high voltage lowering instruction sent by the VCU specifically includes:

[0016] The VCU sends a high-voltage command to the BMS, and determines whether the BMS receives the high-voltage command sent by the VCU:

[0017] If yes, the BMS controls the DCDC to stop working;

[0018] If not, the BMS continues to wait for receiving the high voltage lowering instruction sent by the VCU.

[0019] In combination with the first aspect, in one implementation, before controlling the main positive relay and the main negative relay to be disconnected, the method further includes:

[0020] Determine whether DCDC has stopped working:

[0021] If so, the main positive relay and the main negative relay are controlled to be disconnected;

[0022] If not, continue to determine whether the DCDC has stopped working.

[0023] In combination with the first aspect, in one implementation, the controlling the main positive relay and the main negative relay to be disconnected, and controlling the DCDC to be enabled, and performing active discharge to charge the low-voltage battery specifically includes:

[0024] The BMS performs disconnection control of the main positive relay and the main negative relay, and determines whether the main positive relay and the main negative relay are both disconnected:

[0025] If so, the BMS controls DCDC to enable and performs active discharge, converting the electrical energy of the capacitor in the MCU into low voltage to charge the low-voltage battery;

[0026] If not, continue to determine whether the main positive relay and the main negative relay are both disconnected.

[0027] In combination with the first aspect, in one implementation, controlling the DCDC to stop working according to the voltage of the capacitor in the driving motor system and ending the active discharge to complete the lower high voltage operation specifically includes:

[0028] The MCU sends the voltage of the capacitor in the drive motor system to the BMS, and the BMS determines the received voltage;

[0029] Based on the judgment result, when the voltage is lower than the set voltage, the BMS controls the DCDC to stop working, and the BMS feedbacks the active discharge completion status, and the high voltage is completed.

[0030] In combination with the first aspect, in one implementation, based on the judgment result, when the voltage is less than the set voltage, the BMS controls the DCDC to stop working, the BMS feeds back the active discharge completion state, and the lower high voltage is completed, specifically including:

[0031] The BMS determines whether the capacitor voltage sent by the MCU is less than the set voltage:

[0032] If so, the BMS controls the DCDC to stop working, and the BMS feedbacks the active discharge completion status, and the high voltage is completed;

[0033] If not, determining whether the charging time for charging the low-voltage battery exceeds a preset time;

[0034] -When it exceeds, the active discharge timeout fault is reported, and then the BMS continues to determine whether the capacitor voltage sent by the MCU is less than the set voltage;

[0035] -When it is not exceeded, the BMS continues to determine whether the capacitor voltage sent by the MCU is less than the set voltage.

[0036] In a second aspect, an embodiment of the present application provides a high-voltage active discharge control device for a new energy vehicle, the high-voltage active discharge control device for a new energy vehicle comprising:

[0037] A control module, which is used to control the MCU to stop working based on a stop enable signal sent by the VCU, and to control the DCDC to stop working based on a lower high voltage instruction sent by the VCU;

[0038] A charging module, which is used to control the main positive relay and the main negative relay to be disconnected, and to control the DCDC to enable, and to perform active discharge to charge the low-voltage battery;

[0039] The execution module is used to control the DCDC to stop working according to the voltage of the capacitor in the driving motor system, and end the active discharge to complete the lower high voltage operation.

[0040] In a third aspect, an embodiment of the present application provides a high-voltage active discharge control device for a new energy vehicle, wherein the high-voltage active discharge control device for a new energy vehicle comprises a processor, a memory, and a high-voltage active discharge control program for a new energy vehicle stored in the memory and executable by the processor, wherein when the high-voltage active discharge control program for a new energy vehicle is executed by the processor, the steps of the high-voltage active discharge control method for a new energy vehicle described above are implemented.

[0041] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a high-voltage active discharge control program for a new energy vehicle is stored. When the high-voltage active discharge control program for a new energy vehicle is executed by a processor, the steps of the high-voltage active discharge control method for a new energy vehicle described above are implemented.

[0042] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0043] By integrating DCDC into the power battery system and eliminating the active discharge-related electrical components inside the drive motor system, the MCU software cancels the active discharge control-related strategies, which can effectively reduce the cost of the vehicle's electronic control system. The active discharge current can be adaptively adjusted according to the vehicle's active discharge time requirements and DCDC performance, thereby improving the active discharge performance and safety, and making the active discharge process safe and controllable. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is the current mainstream high-voltage active discharge solution architecture;

[0045] Figure 2 This is a flow chart of the high voltage active discharge control method for new energy vehicles in this application;

[0046] Figure 3 The high-voltage active discharge solution architecture corresponding to the high-voltage active discharge control method for new energy vehicles in this application;

[0047] Figure 4 This is a functional module diagram of the high-voltage active discharge control device for new energy vehicles in this application;

[0048] Figure 5 This is a schematic diagram of the hardware structure of the high-voltage active discharge control device for new energy vehicles in this application. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0050] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0051] In the first aspect, an embodiment of the present application provides a high-voltage active discharge control method for a new energy vehicle. By integrating a DCDC power supply module in the drive motor system, when the vehicle requires high-voltage active discharge, the high-voltage electricity in the capacitor of the drive motor system is converted into a low voltage to charge the low-voltage battery through a DCDC (direct current-to-direct current converter) converter, and at the same time, the capacitor in the drive motor system is actively discharged at high voltage.

[0052] In one embodiment, referring to Figure 2 , Figure 2 This is a flow chart of the high-voltage active discharge control method for new energy vehicles of this application. The high-voltage active discharge control method for new energy vehicles of this application is implemented based on the high-voltage active discharge solution architecture, and the DCDC used to connect the low-voltage battery in the high-voltage active discharge solution architecture is integrated into the power battery system, and the active discharge relay and active discharge resistor are removed from the drive motor system. For details, see Figure 3 As shown, this is the high-voltage active discharge solution architecture corresponding to the high-voltage active discharge control method for new energy vehicles of the present application. The high-voltage active discharge solution architecture is based on the conventional high-voltage active discharge solution architecture for new energy vehicles. The improvement lies in that the DCDC used to connect the low-voltage battery is integrated into the power battery system, and at the same time, the active discharge-related electrical components inside the drive motor system, namely the active discharge relay and the active discharge resistor, are eliminated.

[0053] like Figure 1 As shown, the high-voltage active discharge control method for new energy vehicles of the present application includes:

[0054] S1: Based on the stop enable signal sent by the VCU, the MCU is controlled to stop working, and based on the low-voltage instruction sent by the VCU, the DCDC is controlled to stop working;

[0055] S2: Control the main positive relay and the main negative relay to disconnect, and control the DCDC to enable, and perform active discharge to charge the low-voltage battery;

[0056] S3: According to the voltage of the capacitor in the drive motor system, the DCDC is controlled to stop working, and the active discharge is ended to complete the lower high voltage operation.

[0057] Further, in one embodiment, controlling the MCU to stop working based on the stop enable signal sent by the VCU specifically includes:

[0058] When the vehicle is stopped, the VCU determines whether the vehicle meets the lower high-voltage state:

[0059] If not, continue to determine whether the vehicle meets the lower high pressure state;

[0060] If yes, the VCU sends a stop enable signal to the MCU, and determines whether the MCU receives the stop enable signal sent by the VCU;

[0061] -If received, the MCU stops working;

[0062] -If not received, the MCU continues to wait for the stop enable signal sent by the VCU.

[0063] Specifically, when the user stops the vehicle, the VCU (Vehicle Control Unit) determines whether the vehicle meets the lower high-voltage state. If not, it continues to determine whether the vehicle meets the lower high-voltage state. If so, the VCU sends a stop enable signal to the MCU, and then determines whether the MCU receives the stop enable signal sent by the VCU. If not, it continues to determine whether the MCU receives the stop enable signal sent by the VCU. If received, the MCU stops working.

[0064] Further, in one embodiment, controlling the DCDC to stop working based on the low-voltage instruction sent by the VCU specifically includes:

[0065] The VCU sends a high-voltage command to the BMS, and determines whether the BMS receives the high-voltage command sent by the VCU:

[0066] If yes, the BMS controls the DCDC to stop working;

[0067] If not, the BMS continues to wait for receiving the high voltage lowering instruction sent by the VCU.

[0068] Specifically, when the MCU stops working, the VCU sends a high-voltage instruction to the BMS (Battery Management System), and then determines whether the BMS has received the high-voltage instruction sent by the VCU. If not, it continues to determine whether the BMS has received the high-voltage instruction sent by the VCU. If received, the BMS controls the DCDC to stop working.

[0069] Furthermore, in one embodiment, before controlling the main positive relay and the main negative relay to be disconnected, the method further includes:

[0070] Determine whether DCDC has stopped working:

[0071] If so, the main positive relay and the main negative relay are controlled to be disconnected;

[0072] If not, continue to determine whether the DCDC has stopped working.

[0073] Specifically, after the BMS controls the DCDC to stop working, it determines whether the DCDC has stopped working. If not, it continues to determine whether the DCDC has stopped working. If so, it controls the main positive relay and the main negative relay to be disconnected.

[0074] Further, in one embodiment, the main positive relay and the main negative relay are controlled to be disconnected, and the DCDC is controlled to be enabled, and active discharge is performed to charge the low-voltage battery, specifically including:

[0075] The BMS performs disconnection control of the main positive relay and the main negative relay, and determines whether the main positive relay and the main negative relay are both disconnected:

[0076] If so, the BMS controls DCDC to enable and performs active discharge, converting the electrical energy of the capacitor in the MCU into low voltage to charge the low-voltage battery;

[0077] If not, continue to determine whether the main positive relay and the main negative relay are both disconnected.

[0078] Specifically, after the BMS performs the disconnection control of the main positive relay and the main negative relay, it determines whether the main positive relay and the main negative relay are both disconnected. If not, it continues to determine whether the main positive relay and the main negative relay are both disconnected. If so, the BMS controls the DCDC to enable, performs active discharge, converts the electrical energy of the capacitor in the MCU into low voltage, and charges the low-voltage battery.

[0079] Further, in one embodiment, the DCDC is controlled to stop working according to the voltage of the capacitor in the drive motor system, and the active discharge is terminated to complete the lower high voltage operation, which specifically includes:

[0080] S301: The MCU sends the voltage of the capacitor in the drive motor system to the BMS, and the BMS determines the received voltage;

[0081] S302: Based on the judgment result, when the voltage is less than the set voltage, the BMS controls the DCDC to stop working, and the BMS feeds back the active discharge completion status, and the lowering of the high voltage is completed.

[0082] Further, in one embodiment, based on the judgment result, when the voltage is less than the set voltage, the BMS controls the DCDC to stop working, and the BMS feeds back the active discharge completion state, and the lower high voltage is completed, specifically including:

[0083] The BMS determines whether the capacitor voltage sent by the MCU is less than the set voltage:

[0084] If so, the BMS controls the DCDC to stop working, and the BMS feedbacks the active discharge completion status, and the high voltage is completed;

[0085] If not, determining whether the charging time for charging the low-voltage battery exceeds a preset time;

[0086] -When it exceeds, the active discharge timeout fault is reported, and then the BMS continues to determine whether the capacitor voltage sent by the MCU is less than the set voltage;

[0087] -When it is not exceeded, the BMS continues to determine whether the capacitor voltage sent by the MCU is less than the set voltage.

[0088] Specifically, after charging the low-voltage battery, the MCU drives the capacitor voltage in the motor system, and the BMS determines whether the capacitor voltage sent by the MCU is less than 60V. If so, the BMS controls the DCDC to stop working, and the BMS feeds back the active discharge completion status, and the lower high voltage is completed. If not, it determines whether the charging time for the low-voltage battery exceeds 3s. If so, it reports an active discharge timeout fault, and then the BMS continues to determine whether the capacitor voltage sent by the MCU is less than 60V. If not, the BMS continues to determine whether the capacitor voltage sent by the MCU is less than the set voltage.

[0089] The present application is based on a conventional high-voltage active discharge solution architecture, integrates DCDC in the power battery system, and eliminates active discharge-related electrical components inside the drive motor system. The DCDC startup operation is used to convert high and low voltages to charge the low-voltage battery, and the high-voltage electricity of the capacitor in the drive motor system is actively discharged. The active discharge process is controllable, and the DCDC operation is stopped after the active discharge of the capacitor is completed, and the active discharge is completed.

[0090] The high-voltage active discharge control method for new energy vehicles in the embodiment of the present application can effectively reduce the cost of the vehicle's electronic control system by integrating DCDC in the power battery system and canceling the active discharge-related electrical components in the drive motor system. The MCU software cancels the active discharge control-related strategies, and the active discharge current can be adaptively adjusted according to the active discharge time requirements of the entire vehicle and the DCDC performance, thereby improving the active discharge performance and active discharge safety, and the active discharge process is safe and controllable.

[0091] In a second aspect, an embodiment of the present application also provides a high-voltage active discharge control device for a new energy vehicle.

[0092] In one embodiment, referring to Figure 4 , Figure 4 This is a functional module diagram of the high voltage active discharge control device for new energy vehicles in this application. Figure 4 As shown, the high-voltage active discharge control device for new energy vehicles includes: a control module, a charging module, and an execution module.

[0093] The control module is used to control the MCU to stop working based on the stop enable signal sent by the VCU, and to control the DCDC to stop working based on the low-voltage instruction sent by the VCU; the charging module is used to control the main positive relay and the main negative relay to be disconnected, and to control the DCDC to enable, and to perform active discharge to charge the low-voltage battery; the execution module is used to control the DCDC to stop working according to the voltage of the capacitor in the drive motor system, and to end the active discharge to complete the low-voltage operation.

[0094] In this application, the stop enable signal sent by the VCU is used to control the MCU to stop working, specifically including:

[0095] When the vehicle is stopped, the VCU determines whether the vehicle meets the lower high-voltage state:

[0096] If not, continue to determine whether the vehicle meets the lower high pressure state;

[0097] If yes, the VCU sends a stop enable signal to the MCU, and determines whether the MCU receives the stop enable signal sent by the VCU;

[0098] -If received, the MCU stops working;

[0099] -If not received, the MCU continues to wait for the stop enable signal sent by the VCU.

[0100] In this application, based on the low-voltage instruction sent by the VCU to control the DCDC to stop working, specifically includes:

[0101] The VCU sends a high-voltage command to the BMS, and determines whether the BMS receives the high-voltage command sent by the VCU:

[0102] If yes, the BMS controls the DCDC to stop working;

[0103] If not, the BMS continues to wait for receiving the high voltage lowering instruction sent by the VCU.

[0104] In the present application, before controlling the main positive relay and the main negative relay to be disconnected, it also includes:

[0105] Determine whether DCDC has stopped working:

[0106] If so, the main positive relay and the main negative relay are controlled to be disconnected;

[0107] If not, continue to determine whether the DCDC has stopped working.

[0108] In this application, the main positive relay and the main negative relay are controlled to be disconnected, and the DCDC is controlled to be enabled, and active discharge is performed to charge the low-voltage battery, specifically including:

[0109] The BMS performs disconnection control of the main positive relay and the main negative relay, and determines whether the main positive relay and the main negative relay are both disconnected:

[0110] If so, the BMS controls DCDC to enable and performs active discharge, converting the electrical energy of the capacitor in the MCU into low voltage to charge the low-voltage battery;

[0111] If not, continue to determine whether the main positive relay and the main negative relay are both disconnected.

[0112] In this application, the DCDC is controlled to stop working according to the voltage of the capacitor in the drive motor system, and the active discharge is ended to complete the lower high voltage operation, which specifically includes:

[0113] The MCU sends the voltage of the capacitor in the drive motor system to the BMS, and the BMS determines the received voltage;

[0114] Based on the judgment result, when the voltage is lower than the set voltage, the BMS controls the DCDC to stop working, and the BMS feedbacks the active discharge completion status, and the high voltage is completed.

[0115] In this application, based on the judgment result, when the voltage is less than the set voltage, the BMS controls the DCDC to stop working, and the BMS feedbacks the active discharge completion status, and the lower high voltage is completed, specifically including:

[0116] The BMS determines whether the capacitor voltage sent by the MCU is less than the set voltage:

[0117] If so, the BMS controls the DCDC to stop working, and the BMS feedbacks the active discharge completion status, and the high voltage is completed;

[0118] If not, determining whether the charging time for charging the low-voltage battery exceeds a preset time;

[0119] -When it exceeds, the active discharge timeout fault is reported, and then the BMS continues to determine whether the capacitor voltage sent by the MCU is less than the set voltage;

[0120] -When it is not exceeded, the BMS continues to determine whether the capacitor voltage sent by the MCU is less than the set voltage.

[0121] In a third aspect, an embodiment of the present application provides a high-voltage active discharge control device for a new energy vehicle. The high-voltage active discharge control device for a new energy vehicle can be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0122] Reference Figure 5 , Figure 5 The hardware structure diagram of the high-voltage active discharge control device for new energy vehicles involved in the embodiment of the present application is shown in FIG. In the embodiment of the present application, the high-voltage active discharge control device for new energy vehicles may include a processor, a memory, a communication interface, and a communication bus.

[0123] The communication bus may be of any type and is used to interconnect the processor, the memory, and the communication interface.

[0124] The communication interface includes input / output (I / O) interface, physical interface and logical interface, etc., which are used to realize the interconnection of devices inside the high-voltage active discharge control device of new energy vehicles, and the interface used to realize the interconnection between the high-voltage active discharge control device of new energy vehicles and other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, a fiber optic interface, an ATM interface, etc.; the user device can be a display (Display), a keyboard (Keyboard), etc.

[0125] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0126] The processor may be a general-purpose processor, and the general-purpose processor may call the new energy vehicle high-voltage active discharge control program stored in the memory, and execute the new energy vehicle high-voltage active discharge control method provided in the embodiment of the present application. For example, the general-purpose processor may be a central processing unit (CPU). Among them, the method executed when the new energy vehicle high-voltage active discharge control program is called may refer to the various embodiments of the new energy vehicle high-voltage active discharge control method of the present application, which will not be repeated here.

[0127] Those skilled in the art will understand that Figure 5The hardware structure shown in the figure does not constitute a limitation on the present application, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0128] In a fourth aspect, an embodiment of the present application also provides a computer-readable storage medium.

[0129] The computer-readable storage medium of the present application stores a high-voltage active discharge control program for new energy vehicles, wherein when the high-voltage active discharge control program for new energy vehicles is executed by a processor, the steps of the high-voltage active discharge control method for new energy vehicles as described above are implemented.

[0130] Among them, the method implemented when the high-voltage active discharge control program of the new energy vehicle is executed can refer to the various embodiments of the high-voltage active discharge control method of the new energy vehicle of the present application, and will not be repeated here.

[0131] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit "first", "second" and "third" to different types.

[0132] In the description of the embodiments of the present application, "exemplary", "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary", "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[0133] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0134] In some processes described in the embodiments of the present application, multiple operations or steps that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0135] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present application.

[0136] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A high-voltage active discharge control method for new energy vehicles is implemented based on a high-voltage active discharge solution architecture, and the DCDC used to connect the low-voltage battery in the high-voltage active discharge solution architecture is integrated into the power battery system, and the active discharge relay and active discharge resistor are removed from the drive motor system, characterized in that: The new energy vehicle high voltage active discharge control method comprises: Based on the stop enable signal sent by the VCU, the MCU is controlled to stop working, and based on the low-voltage instruction sent by the VCU, the DCDC is controlled to stop working; Control the main positive relay and the main negative relay to be disconnected, and control the DCDC to be enabled, and perform active discharge to charge the low-voltage battery; According to the voltage of the capacitor in the drive motor system, the DCDC is controlled to stop working, and the active discharge is ended to complete the low-voltage operation.

2. A high-voltage active discharge control method for new energy vehicles as claimed in claim 1, characterized in that: The stop enable signal sent by the VCU is used to control the MCU to stop working, specifically including: When the vehicle is stopped, the VCU determines whether the vehicle meets the lower high-voltage state: If not, continue to determine whether the vehicle meets the lower high pressure state; If yes, the VCU sends a stop enable signal to the MCU, and determines whether the MCU receives the stop enable signal sent by the VCU; -If received, the MCU stops working; -If not received, the MCU continues to wait for the stop enable signal sent by the VCU.

3. A high-voltage active discharge control method for new energy vehicles as claimed in claim 1, characterized in that: The control of the DCDC to stop working based on the high voltage instruction sent by the VCU specifically includes: The VCU sends a high-voltage command to the BMS, and determines whether the BMS receives the high-voltage command sent by the VCU: If yes, the BMS controls the DCDC to stop working; If not, the BMS continues to wait for receiving the high voltage lowering instruction sent by the VCU.

4. A high-voltage active discharge control method for new energy vehicles as claimed in claim 1, characterized in that: Before controlling the main positive relay and the main negative relay to be disconnected, it also includes: Determine whether DCDC has stopped working: If so, the main positive relay and the main negative relay are controlled to be disconnected; If not, continue to determine whether the DCDC has stopped working.

5. A high voltage active discharge control method for new energy vehicles as claimed in claim 1, characterized in that: The controlling the main positive relay and the main negative relay to be disconnected, and controlling the DCDC to be enabled, and performing active discharge to charge the low-voltage battery specifically includes: The BMS performs disconnection control of the main positive relay and the main negative relay, and determines whether the main positive relay and the main negative relay are both disconnected: If so, the BMS controls DCDC to enable and performs active discharge, converting the electrical energy of the capacitor in the MCU into low voltage to charge the low-voltage battery; If not, continue to determine whether the main positive relay and the main negative relay are both disconnected.

6. A high voltage active discharge control method for new energy vehicles as claimed in claim 1, characterized in that: The method of controlling the DCDC to stop working according to the voltage of the capacitor in the driving motor system and ending the active discharge to complete the lower high voltage operation specifically includes: The MCU sends the voltage of the capacitor in the drive motor system to the BMS, and the BMS determines the received voltage; Based on the judgment result, when the voltage is lower than the set voltage, the BMS controls the DCDC to stop working, and the BMS feedbacks the active discharge completion status, and the high voltage is completed.

7. A high voltage active discharge control method for new energy vehicles as claimed in claim 6, characterized in that: Based on the judgment result, when the voltage is less than the set voltage, the BMS controls the DCDC to stop working, and the BMS feedbacks the active discharge completion status, and the lower high voltage is completed, specifically including: The BMS determines whether the capacitor voltage sent by the MCU is less than the set voltage: If so, the BMS controls the DCDC to stop working, and the BMS feedbacks the active discharge completion status, and the high voltage is completed; If not, determining whether the charging time for charging the low-voltage battery exceeds a preset time; -When it exceeds, the active discharge timeout fault is reported, and then the BMS continues to determine whether the capacitor voltage sent by the MCU is less than the set voltage; -When it is not exceeded, the BMS continues to determine whether the capacitor voltage sent by the MCU is less than the set voltage.

8. A high-voltage active discharge control device for new energy vehicles, characterized in that: The new energy vehicle high voltage active discharge control device comprises: A control module, which is used to control the MCU to stop working based on a stop enable signal sent by the VCU, and to control the DCDC to stop working based on a lower high voltage instruction sent by the VCU; A charging module, which is used to control the main positive relay and the main negative relay to be disconnected, and to control the DCDC to enable, and to perform active discharge to charge the low-voltage battery; The execution module is used to control the DCDC to stop working according to the voltage of the capacitor in the driving motor system, and end the active discharge to complete the lower high voltage operation.

9. A high-voltage active discharge control device for new energy vehicles, characterized in that: The new energy vehicle high-voltage active discharge control device includes a processor, a memory, and a new energy vehicle high-voltage active discharge control program stored in the memory and executable by the processor, wherein when the new energy vehicle high-voltage active discharge control program is executed by the processor, the steps of the new energy vehicle high-voltage active discharge control method as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a new energy vehicle high-voltage active discharge control program, wherein when the new energy vehicle high-voltage active discharge control program is executed by the processor, the steps of the new energy vehicle high-voltage active discharge control method as described in any one of claims 1 to 7 are implemented.

Images