WO2021139782A1 - Pre-charging control system and method for electric vehicle and high-voltage power-on control system - Google Patents

Pre-charging control system and method for electric vehicle and high-voltage power-on control system Download PDF

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Publication number
WO2021139782A1
WO2021139782A1 PCT/CN2021/070911 CN2021070911W WO2021139782A1 WO 2021139782 A1 WO2021139782 A1 WO 2021139782A1 CN 2021070911 W CN2021070911 W CN 2021070911W WO 2021139782 A1 WO2021139782 A1 WO 2021139782A1
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WIPO (PCT)
Prior art keywords
voltage
dcdc converter
vehicle
electric vehicle
precharge
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PCT/CN2021/070911
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French (fr)
Chinese (zh)
Inventor
郝阳
李雷
王胜博
刘喜明
吴麦青
宋海军
张南
张庚楠
张�浩
贺庆书
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长城汽车股份有限公司
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Publication of WO2021139782A1 publication Critical patent/WO2021139782A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L1/00—Supplying electric power to auxiliary equipment of vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00—Converter types
    • B60L2210/10—DC to DC converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

Definitions

  • the present invention relates to the field of vehicle technology, in particular to a pre-charge control system and method of an electric vehicle, and a high-voltage power-on control system.
  • the high-voltage circuit needs to be established during the high-voltage power-on process of the vehicle controlled by the vehicle controller, and then the vehicle can be operated in a high-voltage state, but the establishment of the high-voltage circuit needs to close the main positive contactor of the high-voltage battery
  • the bus capacitors (such as DC-link capacitors) were precharged beforehand, so as to avoid arcing when closing the main positive contactor and cause certain damage to the battery and high-voltage devices.
  • the pre-charging process of the bus capacitor is mostly realized by the battery control unit controlling the pre-charging contactor, the pre-charging resistor and the pre-charging circuit in series with the bus capacitor.
  • This kind of pre-charging method is relatively simple, relying solely on the internal structure of the battery to realize the pre-charging function, and the pre-charging contactor and the pre-charging resistor are special components, and the cost is relatively high.
  • the present invention aims to provide a pre-charging control system for electric vehicles to solve the problem of single and high cost of existing pre-charging solutions.
  • a pre-charge control system for an electric vehicle is applied to a high-voltage circuit of a vehicle, and the high-voltage circuit of the vehicle includes a battery pack, a bus capacitor and high-voltage components powered by the battery pack, and the pre-charge control system for the electric vehicle Including: a battery management system (Battery Management System, BMS) for managing the battery pack; a direct current/direct current (DCDC) converter for precharging the bus capacitor, and the DCDC The converter is connected with a low-voltage battery; and a vehicle controller for controlling the BMS and the DCDC converter; wherein, the vehicle controller is also used to send a precharge command to the DCDC converter, and The DCDC converter is also used to invert the electric energy of the low-voltage battery into high-voltage electricity in response to the pre-charge instruction, and output the high-voltage electricity to the high-voltage circuit of the vehicle to pre-charge the bus capacitor .
  • BMS Battery Management System
  • DCDC direct current/direct current
  • the pre-charging control system of the electric vehicle of the present invention inverts the low-voltage power of the battery into high-voltage power through a DCDC converter, and outputs it to the high-voltage circuit of the vehicle to complete the charging of the bus capacitor, thereby Realize the pre-charge function.
  • the pre-charge control system of the electric vehicle of the present invention is not equipped with a pre-charge contactor and a pre-charge resistor, and the low-voltage power supply system pre-charge and high-voltage power-on solution is realized only through the existing vehicle controller and DCDC converter. , Which can not only meet functional requirements, but also save development costs.
  • Another object of the present invention is to provide a pre-charging control method for an electric vehicle to solve the problem of single and high cost of the existing pre-charging solution.
  • a pre-charge control method for an electric vehicle is applied to the above-mentioned pre-charge control system for an electric vehicle, and the pre-charge control method for the electric vehicle includes: the vehicle controller sends a pre-charge command to the DCDC converter And the DCDC converter responds to the pre-charge instruction to invert the electric energy of the low-voltage battery into high-voltage electricity, and output the high-voltage electricity to the high-voltage circuit of the vehicle to pre-charge the bus capacitor .
  • the precharging control method of the electric vehicle further includes: the vehicle controller sends the DCDC converter to the DCDC converter based on the set target voltage rise rate Sending a pre-charge target voltage value, the pre-charge target voltage value is used to mark the completion of pre-charge; and the DCDC converter pre-charges the bus capacitor based on the received pre-charge target voltage value.
  • the pre-charge control method further includes: the vehicle controller determines whether the voltage across the bus capacitor reaches the pre-charge target voltage value, and if so, sends a contactor closing instruction to the BMS; and The BMS closes the contactor in the battery pack in response to the contactor closing instruction.
  • the vehicle controller judging whether the voltage value across the bus capacitor reaches the precharge target voltage value includes: the vehicle controller receiving the high voltage side of the DCDC converter feedback from the DCDC converter Voltage, or the vehicle controller receives the high-voltage side voltage of each high-voltage component fed back by the high-voltage component, wherein the high-voltage side voltage of the DCDC converter and the high-voltage side voltage of each high-voltage component are the same as those of each high-voltage component.
  • the voltages at both ends of the bus capacitor are equal; and the vehicle controller compares the received high-voltage side voltage with the precharge target voltage value to determine whether the voltage at both ends of the bus capacitor reaches the precharge target voltage value.
  • the BMS closing the contactor in the battery pack in response to the contactor closing instruction includes: the BMS detecting whether the voltage at both ends of the contactor of the battery pack meets the contactor closing condition, and closing the contactor if so The contactor.
  • the pre-charge control method further includes: after the BMS closes the contactor, if it receives a high-voltage power-on command sent by the vehicle controller, then executes the high-voltage power-on command to make the adjustment The car enters a high-pressure state.
  • the pre-charge control method further includes: the BMS sends feedback to the vehicle controller that the vehicle has entered a high-voltage state; the vehicle controller sends a standby to the DCDC converter in response to the feedback Instruction; and the DCDC converter stops the precharge process in response to the standby instruction.
  • the precharge control method of the electric vehicle further includes: the BMS and the DCDC converter each perform self-test; and The vehicle controller detects whether the state of the high-voltage component is normal and whether the power of the low-voltage battery is greater than a set value.
  • the pre-charge control method of the electric vehicle has the same advantages as the above-mentioned pre-charge control system of the electric vehicle over the prior art, and will not be repeated here.
  • Another object of the present invention is to provide a high-voltage power-on control system for electric vehicles, so as to solve the problem of single pre-charging scheme and high cost involved in the high-voltage power-on of electric vehicles.
  • a high-voltage power-on control system for an electric vehicle includes: a high-voltage circuit of the entire vehicle, including a battery pack, bus capacitors and high-voltage components powered by the battery pack; and the above-mentioned precharge control system for the electric vehicle.
  • the high-voltage power-on control system of the electric vehicle has the same advantages as the above-mentioned pre-charge control system of the electric vehicle over the prior art, which will not be repeated here.
  • FIG. 1 is a schematic diagram of the functional architecture of a pre-charge control system for an electric vehicle according to an embodiment of the present invention
  • Fig. 2 is a schematic diagram of the working principle of the reverse precharging circuit of the DCDC converter in the embodiment of the present invention
  • FIG. 3 is a schematic flowchart of a precharge control method for an electric vehicle according to another embodiment of the present invention.
  • Fig. 4 is a schematic flowchart of an example of an electric vehicle pre-charging control method to which an embodiment of the present invention is applied.
  • the “pre-charge” refers to the pre-charge of the bus capacitor, and the DC-link and the bus capacitor are interchangeable for understanding.
  • the target voltage, the voltage across the bus capacitor, the voltage across the contactor, the high-voltage side voltage of the DCDC converter, and the high-voltage side voltage of the high-voltage components are the same and can be understood interchangeably.
  • FIG. 1 is a schematic diagram of the functional architecture of a pre-charge control system for an electric vehicle according to an embodiment of the present invention.
  • the pre-charge control system is applied to a high-voltage circuit of a whole vehicle, wherein the high-voltage circuit of the whole vehicle includes a battery pack and a battery powered by the battery pack.
  • Bus capacitors and high-voltage components, and the high-voltage components include electric heaters (such as PTC heaters), electric compressors (Compressor, CMP), motor controllers (Motor Control Unit, MCU), etc., among which electric heaters For example, a positive temperature coefficient (PTC) heater.
  • PTC positive temperature coefficient
  • the DC-link capacitor and high-voltage components are connected in parallel on the power supply side of the battery pack.
  • the battery pack is a conventional power battery pack, which includes a main positive contactor 1, a main negative contactor 2, a fuse 3, a heating relay 4, and a heating resistor 5 as shown in FIG. 1.
  • the main positive contactor 1 and the main negative contactor 2 are collectively referred to as contactors.
  • the precharge control system for an electric vehicle includes: a battery management system (Battery Management System, BMS) 110 for managing the battery pack; for precharging the bus capacitor
  • BMS Battery Management System
  • the DCDC converter 120 is connected with a low-voltage battery 130; and a vehicle controller 140 for controlling the BMS and the DCDC converter.
  • the vehicle controller 140 is also used to send a pre-charge command to the DCDC converter 120, and the DCDC converter 120 is also used to reverse the electric energy of the low-voltage battery 130 in response to the pre-charge command. It becomes high-voltage electricity, and outputs the high-voltage electricity to the high-voltage circuit of the whole vehicle to pre-charge the bus capacitor.
  • the vehicle controller can send control commands to the BMS 110, the DCDC converter 120, and high-voltage components through the Power Train CAN (PT CAN).
  • the vehicle controller may be an HCU (Hybird Control Unit, which may be referred to as a hybrid vehicle controller) or a VCU (Vehicle Control Unit, which may be referred to as an electric vehicle controller).
  • the embodiment of the present invention takes the VCU as an example.
  • the DCDC converter is a DC-DC current converter.
  • the DCDC converter uses its own reverse precharging circuit to invert and boost the 12V low voltage to obtain The high voltage electricity needed.
  • FIG. 2 is a schematic diagram of the working principle of the reverse precharging circuit of the DCDC converter in the embodiment of the present invention, where C1-C3 represent three bus capacitors, and C3 corresponds to the bus capacitor (DC-link).
  • the circuit composed of components other than the low-voltage battery 130 and the three bus capacitors C1-C3 can be understood as the reverse precharging circuit of the DCDC converter itself, which realizes the output of the low-voltage battery 130 The voltage is inverted and boosted to obtain a high voltage to pre-charge the bus capacitor.
  • the reverse precharging circuit of the DCDC converter itself is conventional, and the connection relationship between the various components can be known with reference to FIG. 2, so its structure and connection relationship will not be described here.
  • the pre-charge control system of the electric vehicle of the embodiment of the present invention inverts the low-voltage power of the battery into high-voltage power through the DCDC converter, and outputs it to the high-voltage circuit of the vehicle to complete the charging of the bus capacitor, thereby achieving Pre-charge function.
  • This pre-charge control system does not have an additional pre-charge contactor and pre-charge resistor.
  • the low-voltage power supply system pre-charge and high-voltage power-on program is realized through the existing vehicle controller and DCDC converter, which can not only meet the functional requirements, but also Save development costs.
  • FIG. 3 is a schematic flowchart of a precharge control method for an electric vehicle according to another embodiment of the present invention.
  • the precharge control method is applied to the precharge control system of the above embodiment, and it can be understood that the above precharge control system uses a DCDC converter
  • the reverse function realizes the software implementation of the pre-charge function.
  • the precharge control method of the electric vehicle may include the following steps:
  • step S310 the vehicle controller sends a pre-charge instruction to the DCDC converter.
  • Step S320 the DCDC converter inverts the electric energy of the low-voltage battery into high-voltage electricity in response to the pre-charge instruction, and outputs the high-voltage electricity to the high-voltage circuit of the vehicle to pre-charge the bus capacitor. Charge.
  • the DCDC converter can invert only part of the electric energy of the low-voltage battery into high-voltage electricity according to demand.
  • the process of precharging the bus capacitor may further include:
  • step S321 the vehicle controller sends a precharge target voltage value to the DCDC converter based on the set target voltage rise rate.
  • the target voltage is the voltage across the bus capacitor, and the set target voltage rising rate can make the target voltage corresponding to a gradient value at each stage of rising.
  • step S322 the DCDC converter precharges the bus capacitor based on the received precharge target voltage value.
  • step S321 and step S322 for example, after sending the precharge instruction, the vehicle controller monitors the target voltage in real time, and sends the precharge target voltage to the DCDC converter according to the desired target voltage rise rate Value, so that the DCDC performs voltage conversion according to the received precharge target voltage value, so as to ensure that the target voltage rises slowly with a desired gradient, for example, to avoid precharging too fast and damaging the bus capacitor.
  • the pre-charge target voltage value is used to mark the completion of pre-charge
  • the precharge control method of the embodiment of the present invention may further include:
  • step S330 the vehicle controller determines whether the voltage across the bus capacitor reaches the precharge target voltage value, and if so, sends a contactor closing instruction to the BMS.
  • step S340 the BMS closes the contactor in the battery pack in response to the contactor closing instruction.
  • step S330 the vehicle controller determining whether the voltage value across the bus capacitor reaches the precharge target voltage value may preferably include:
  • step S331 the vehicle controller receives the high voltage side voltage of the DCDC converter fed back by the DCDC converter, or the vehicle controller receives the high voltage side voltage of each high voltage component fed back by the high voltage component.
  • the high-voltage side voltage of the DCDC converter and the high-voltage side voltage of each high-voltage component are all equal to the voltage across the bus capacitor.
  • step S332 the vehicle controller compares the received high-voltage side voltage with the pre-charge target voltage value to determine whether the voltage value across the bus capacitor reaches the pre-charge target voltage value.
  • step S340 during the pre-charging process, the main positive contactor and/or the main negative contactor are opened to avoid high-voltage power-on in advance, and after the pre-charging is completed, in response to the contactor closing instruction, the main positive contact Both the inverter and the main negative contactor are closed, so that the BMS is in a standby state, waiting for instructions from the vehicle controller to control the vehicle to enter a high-voltage state.
  • the contactor closing command is further defined as the main positive contactor closing command, and the BMS corresponds to only closing the main positive contactor.
  • the battery pack itself has a mechanism to determine whether the contactor can be closed. That is, for step S340, it may specifically include: the BMS detects whether the voltage at both ends of the contactor of the battery pack meets the contactor closing condition, and if so, the contactor is closed.
  • the contactor closing condition includes the voltage across the bus capacitor and the difference between the high voltage side voltage of each controller and the BMS battery pack terminal voltage is less than a set value (for example, 2V).
  • the precharge control method of the embodiment of the present invention may further include:
  • step S350 after the BMS closes the contactor, if it receives a high-voltage power-on instruction sent by the vehicle controller, it executes the high-voltage power-on instruction to make the vehicle enter a high-voltage state.
  • the vehicle controller may send a high-voltage power-on command at the same time or after sending a contactor closing command (for example, after receiving a feedback that the main positive contactor has been closed), or a contactor closing command and a high-voltage power-on command Instructions can be integrated into the same instruction.
  • the precharge control method of the embodiment of the present invention may further include:
  • step S360 the BMS sends feedback to the vehicle controller that the vehicle has entered a high pressure state.
  • step S370 the vehicle controller sends a standby instruction to the DCDC converter in response to the feedback.
  • the standby instruction indicates to enter the Standby state.
  • step S380 the DCDC converter stops the pre-charging process in response to the standby instruction.
  • the DCDC converter enters a standby (Standby) working mode after stopping the precharging process.
  • the pre-charge control method of the electric vehicle in the embodiment of the present invention implements the pre-charge process of high-voltage power-on through a software strategy, the solution is easy to implement, and is beneficial to saving the development cost of the entire vehicle.
  • the normal execution of steps S310-S380 needs to be established on the basis of the normal high-voltage circuit and pre-charge control system of the vehicle.
  • the pre-charge control method may further include before step S310: the BMS and the DCDC converter each perform a self-test; and the vehicle controller detects the high-voltage zero Whether the state of the component is normal and whether the power of the low-voltage battery is greater than a set value is detected. That is, the pre-inspection link for BMS, DCDC converter, and vehicle controller has been added. The details of this pre-inspection link will be described below in conjunction with examples, and will not be repeated here.
  • Fig. 4 is a schematic flowchart of an example of an electric vehicle pre-charging control method to which an embodiment of the present invention is applied.
  • the electric car adopts the KL15 electric activation mode, in which the engine is started (ie, in the RUN mode), and the corresponding car functions include start-up function, air-conditioning function, lift window function, etc.
  • the pre-charge control method executed by the pre-charge control system composed of the three includes the following steps:
  • step S401 the BMS detects whether there is an abnormality, and if so, it feeds back the BMS error information, otherwise the BMS reports that it is in the Standby state to the VCU.
  • step S402 the DCDC converter detects whether there is an abnormality, and if so, feeds back the error information of the DCDC converter, otherwise the DCDC converter reports that it is in the Standby state to the VCU.
  • step S403 the VCU detects whether the state of each high-voltage component is normal, if it is not normal, it will notify the power-on failure, and if it is normal, step S404 will be executed.
  • step S404 the VCU detects whether the 12V lead-acid battery has a power greater than 80%, and if so, executes step S405, otherwise it notifies the power-on failure.
  • 80% is the calibration value, which can be adjusted according to actual needs.
  • step S405 the VCU sends a pre-charge instruction to the DCDC converter.
  • step S406 the DCDC converter accepts the precharge instruction.
  • step S407 the DCDC converter detects its high voltage side voltage and feeds it back to the VCU.
  • step S408 the VCU receives the high-voltage side voltage of the DCDC converter and each high-voltage component.
  • step S409 the VCU sends the pre-charge target voltage value until the pre-charge is completed according to the set target voltage rising rate.
  • step S410 the DCDC converter starts to precharge until it is consistent with the precharge target voltage value sent by the VCU.
  • step S411 the VCU detects whether the precharge is completed, and if so, executes step S412.
  • step S412 the VCU sends a contactor closing instruction to the BMS, and then goes to step S414.
  • step S413 the BMS detects the voltage across the contactor.
  • Step S414 the BMS receives the contactor closing instruction.
  • step S415 the BMS determines that the voltage across the contactor meets the contactor closing condition, and closes the contactor accordingly to start high-voltage power-on.
  • step S416 the BMS completes power-on and feeds back a power-on completion signal to the VCU.
  • step S417 the VCU receives the power-on completion signal, and sends an instruction to enter the Standby mode to the DCDC converter.
  • step S4108 the DCDC converter receives the instruction from the VCU and enters the Standby mode.
  • Step S419 the VCU sends an instruction to enter the BUCK mode to the DCDC converter
  • the BUCK mode is a step-down mode
  • the aforementioned DCDC converter performs an inverter boost mode called a BOOST mode
  • the BOOST mode is a boost mode.
  • step S420 the DCDC converter receives the instruction from the VCU and enters the BUCK mode.
  • step S421 the VCU enters the RUN state and lights up the READY light on the meter.
  • the BMS enters the Drive mode, the VCU is powered on, and the DCDC converter enters the BUCK mode. That is, through the above steps S401-S421, under the condition of relying only on the existing controllers (VCU and BMS), the pre-charge of the bus capacitor is completed by the reverse function of the DCDC converter, and the high-voltage power-on is further realized. It is conducive to saving the development cost of the whole vehicle.
  • the VCU, DCDC converter, and BMS can execute their respective steps by running programs.
  • the corresponding program can be stored in the memory, and the memory may include non-permanent memory in computer readable media, random access memory (RAM) and/or non-volatile memory, such as read-only memory (ROM) or flash memory ( flash RAM).
  • RAM random access memory
  • ROM read-only memory
  • flash RAM flash memory
  • the memory is an example of a computer-readable medium, and the computer-readable medium includes permanent and non-permanent, removable and non-removable media, and information storage can be realized by any method or technology.
  • the information can be computer-readable instructions, data structures, program modules, or other data.
  • Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, CD-ROM, digital versatile disc (DVD) or other optical storage, Magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media can be used to store information that can be accessed by computing devices.
  • PRAM phase change memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • RAM random access memory
  • ROM read-only memory
  • EEPROM electrically erasable programmable read-only memory
  • flash memory or other memory technology
  • CD-ROM compact disc
  • DVD digital versatile disc
  • Magnetic cassettes magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media can be used to store information that can be accessed by computing devices.
  • FIG. 1 includes: a high-voltage circuit of the entire vehicle, including a battery pack, and The bus capacitor and high-voltage components powered by the battery pack; and the pre-charge control system of the electric vehicle described in the above embodiment.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

A pre-charging control system and method for an electric vehicle and a high-voltage power-on control system. The pre-charging control system is applied to a vehicle high-voltage circuit, and comprises: a battery management system BMS (110) used for managing battery packs; a direct current-direct current DCDC converter (120) used for pre-charging a bus capacitor, the DCDC converter (120) being connected to a low-voltage storage battery (130); and a vehicle control unit (140) used for controlling the battery management system BMS (110) and the DCDC converter (120), wherein the vehicle control unit (140) is further used to send a pre-charging instruction to the DCDC converter (120), and the DCDC converter (120) is further used to respond to the pre-charging instruction and then invert electric energy of the low-voltage storage battery (130) into high-voltage electricity, and output the high-voltage electricity to the vehicle high-voltage circuit so as to pre-charge the bus capacitor.

Description

电动汽车的预充控制***、方法及高压上电控制***Electric vehicle pre-charging control system, method and high-voltage power-on control system
相关申请的交叉引用Cross-references to related applications
本申请要求2020年01月10日提交的中国专利申请202010025509.7的权益，该申请的内容通过引用被合并于本文。This application claims the rights and interests of the Chinese patent application 202010025509.7 filed on January 10, 2020, the content of which is incorporated herein by reference.
技术领域Technical field
本发明涉及车辆技术领域，特别涉及一种电动汽车的预充控制***、方法及高压上电控制***。The present invention relates to the field of vehicle technology, in particular to a pre-charge control system and method of an electric vehicle, and a high-voltage power-on control system.
背景技术Background technique
对于电动汽车，由整车控制器控制的整车高压上电过程中需要先建立高压回路，然后才会使得整车工作在高压状态，但是高压回路的建立需要在闭合高压电池的主正接触器之前先对母线电容(例如DC-link电容)进行预充，这样才能在闭合主正接触器时避免产生电弧而对电池及高压器件造成一定的损伤。For electric vehicles, the high-voltage circuit needs to be established during the high-voltage power-on process of the vehicle controlled by the vehicle controller, and then the vehicle can be operated in a high-voltage state, but the establishment of the high-voltage circuit needs to close the main positive contactor of the high-voltage battery The bus capacitors (such as DC-link capacitors) were precharged beforehand, so as to avoid arcing when closing the main positive contactor and cause certain damage to the battery and high-voltage devices.
目前，对母线电容的预充过程多是通过电池控制单元控制预充接触器、预充电阻与母线电容串联的预充回路实现的。这种预充方式比较单一，单纯依靠地电池内部构造预充回路来实现预充功能，而且预充接触器及预充电阻均为特殊元器件，成本要相对较高。At present, the pre-charging process of the bus capacitor is mostly realized by the battery control unit controlling the pre-charging contactor, the pre-charging resistor and the pre-charging circuit in series with the bus capacitor. This kind of pre-charging method is relatively simple, relying solely on the internal structure of the battery to realize the pre-charging function, and the pre-charging contactor and the pre-charging resistor are special components, and the cost is relatively high.
发明内容Summary of the invention
有鉴于此，本发明旨在提出一种电动汽车的预充控制***，以解决现有预充方案单一且成本高的问题。In view of this, the present invention aims to provide a pre-charging control system for electric vehicles to solve the problem of single and high cost of existing pre-charging solutions.
为达到上述目的，本发明的技术方案是这样实现的：In order to achieve the above objective, the technical scheme of the present invention is achieved as follows:
一种电动汽车的预充控制***，应用于整车高压回路，且该整车高压回路包括电池包以及由所述电池包供电的母线电容和高压零部件，所述电动汽车的预充控制***包括：用于管理所述电池包的电池管理***(Battery Management System，BMS)；用于对所述母线电容进行预充的直流-直流(Direct Current/Direct Current，DCDC)转换器，且该DCDC转换器连接有低压蓄电池；以及用于控制所述BMS和所述DCDC转换器的整车控制器；其中，所述整车控制器还用于向所述DCDC转换器发送预充指令，且所述DCDC转换器还用于响应所述预充指令而将所述低压蓄电池的电能逆变成高压电，并输出该高压电至所述整车高压回路以对所述母线电容进行预充。A pre-charge control system for an electric vehicle is applied to a high-voltage circuit of a vehicle, and the high-voltage circuit of the vehicle includes a battery pack, a bus capacitor and high-voltage components powered by the battery pack, and the pre-charge control system for the electric vehicle Including: a battery management system (Battery Management System, BMS) for managing the battery pack; a direct current/direct current (DCDC) converter for precharging the bus capacitor, and the DCDC The converter is connected with a low-voltage battery; and a vehicle controller for controlling the BMS and the DCDC converter; wherein, the vehicle controller is also used to send a precharge command to the DCDC converter, and The DCDC converter is also used to invert the electric energy of the low-voltage battery into high-voltage electricity in response to the pre-charge instruction, and output the high-voltage electricity to the high-voltage circuit of the vehicle to pre-charge the bus capacitor .
相对于现有技术，本发明所述的电动汽车的预充控制***通过DCDC转换器将蓄电池的低压电逆变成高压电，并输出至整车高压回路以完成对母线电容的充电，从而实现预充功能。并且，本发明所述的电动汽车的预充控制***没有另外配置预充接触器及预充电阻，仅通过现有整车控制器及DCDC转换器就实现了低压供电***预充高压上电方案，既能满足功能需求，又能节约开发成本。Compared with the prior art, the pre-charging control system of the electric vehicle of the present invention inverts the low-voltage power of the battery into high-voltage power through a DCDC converter, and outputs it to the high-voltage circuit of the vehicle to complete the charging of the bus capacitor, thereby Realize the pre-charge function. Moreover, the pre-charge control system of the electric vehicle of the present invention is not equipped with a pre-charge contactor and a pre-charge resistor, and the low-voltage power supply system pre-charge and high-voltage power-on solution is realized only through the existing vehicle controller and DCDC converter. , Which can not only meet functional requirements, but also save development costs.
本发明的另一目的在于提出一种电动汽车的预充控制方法，以解决现有预充方案单一且成本高的问题。Another object of the present invention is to provide a pre-charging control method for an electric vehicle to solve the problem of single and high cost of the existing pre-charging solution.
为达到上述目的，本发明的技术方案是这样实现的：In order to achieve the above objective, the technical scheme of the present invention is achieved as follows:
一种电动汽车的预充控制方法，应用于上述的电动汽车的预充控制***，且所述电动汽车的预充控制方法包括：所述整车控制器向所述DCDC转换器发送预充指令；以及所述DCDC转换器响应所述预充指令而将所述低压蓄电池的电能逆变成高压电，并输出该高压电至所述整车高压回路以对所述母线电容进行预充。A pre-charge control method for an electric vehicle is applied to the above-mentioned pre-charge control system for an electric vehicle, and the pre-charge control method for the electric vehicle includes: the vehicle controller sends a pre-charge command to the DCDC converter And the DCDC converter responds to the pre-charge instruction to invert the electric energy of the low-voltage battery into high-voltage electricity, and output the high-voltage electricity to the high-voltage circuit of the vehicle to pre-charge the bus capacitor .
进一步的，在所述对所述母线电容进行预充的过程中，所述电动 汽车的预充控制方法还包括：所述整车控制器基于设定的目标电压上升速率向所述DCDC转换器发送预充目标电压值，该预充目标电压值用于标志预充完成；以及所述DCDC转换器基于接收到的所述预充目标电压值进行对所述母线电容的预充。Further, in the process of precharging the bus capacitor, the precharging control method of the electric vehicle further includes: the vehicle controller sends the DCDC converter to the DCDC converter based on the set target voltage rise rate Sending a pre-charge target voltage value, the pre-charge target voltage value is used to mark the completion of pre-charge; and the DCDC converter pre-charges the bus capacitor based on the received pre-charge target voltage value.
进一步的，所述预充控制方法还包括：所述整车控制器判断所述母线电容两端的电压是否达到所述预充目标电压值，若是，则向所述BMS发送接触器闭合指令；以及所述BMS响应于所述接触器闭合指令闭合所述电池包中的接触器。Further, the pre-charge control method further includes: the vehicle controller determines whether the voltage across the bus capacitor reaches the pre-charge target voltage value, and if so, sends a contactor closing instruction to the BMS; and The BMS closes the contactor in the battery pack in response to the contactor closing instruction.
进一步的，所述整车控制器判断所述母线电容两端的电压值是否达到所述预充目标电压值包括：所述整车控制器接收所述DCDC转换器反馈的该DCDC转换器的高压侧电压，或者所述整车控制器接收所述高压零部件反馈的各个高压零部件的高压侧电压，其中所述DCDC转换器的高压侧电压和所述各个高压零部件的高压侧电压均与所述母线电容两端的电压相等；以及所述整车控制器将所接收的高压侧电压与所述预充目标电压值进行比较以判断所述母线电容两端的电压值是否达到所述预充目标电压值。Further, the vehicle controller judging whether the voltage value across the bus capacitor reaches the precharge target voltage value includes: the vehicle controller receiving the high voltage side of the DCDC converter feedback from the DCDC converter Voltage, or the vehicle controller receives the high-voltage side voltage of each high-voltage component fed back by the high-voltage component, wherein the high-voltage side voltage of the DCDC converter and the high-voltage side voltage of each high-voltage component are the same as those of each high-voltage component. The voltages at both ends of the bus capacitor are equal; and the vehicle controller compares the received high-voltage side voltage with the precharge target voltage value to determine whether the voltage at both ends of the bus capacitor reaches the precharge target voltage value.
进一步的，所述BMS响应于所述接触器闭合指令闭合所述电池包中的接触器包括：所述BMS检测所述电池包的接触器两端电压是否满足接触器闭合条件，若满足则闭合所述接触器。Further, the BMS closing the contactor in the battery pack in response to the contactor closing instruction includes: the BMS detecting whether the voltage at both ends of the contactor of the battery pack meets the contactor closing condition, and closing the contactor if so The contactor.
进一步的，所述预充控制方法还包括：所述BMS在闭合所述接触器后，若接收到所述整车控制器发送的高压上电指令，则执行所述高压上电指令以使整车进入高压状态。Further, the pre-charge control method further includes: after the BMS closes the contactor, if it receives a high-voltage power-on command sent by the vehicle controller, then executes the high-voltage power-on command to make the adjustment The car enters a high-pressure state.
进一步的，所述预充控制方法还包括：所述BMS向所述整车控制器发送关于整车已进入高压状态的反馈；所述整车控制器响应于所述反馈向DCDC转换器发送待机指令；以及所述DCDC转换器响应 于所述待机指令停止预充过程。Further, the pre-charge control method further includes: the BMS sends feedback to the vehicle controller that the vehicle has entered a high-voltage state; the vehicle controller sends a standby to the DCDC converter in response to the feedback Instruction; and the DCDC converter stops the precharge process in response to the standby instruction.
进一步的，在所述整车控制器向所述DCDC转换器发送预充指令之前，所述电动汽车的预充控制方法还包括：所述BMS及所述DCDC转换器各自进行自检；以及所述整车控制器检测所述高压零部件的状态是否正常以及检测所述低压蓄电池的电量是否大于设定值。Further, before the vehicle controller sends a precharge instruction to the DCDC converter, the precharge control method of the electric vehicle further includes: the BMS and the DCDC converter each perform self-test; and The vehicle controller detects whether the state of the high-voltage component is normal and whether the power of the low-voltage battery is greater than a set value.
所述电动汽车的预充控制方法与上述电动汽车的预充控制***相对于现有技术所具有的优势相同，在此不再赘述。The pre-charge control method of the electric vehicle has the same advantages as the above-mentioned pre-charge control system of the electric vehicle over the prior art, and will not be repeated here.
本发明的另一目的在于提出一种电动汽车的高压上电控制***，以解决现有电动汽车高压上电中涉及的预充方案单一且成本高的问题。Another object of the present invention is to provide a high-voltage power-on control system for electric vehicles, so as to solve the problem of single pre-charging scheme and high cost involved in the high-voltage power-on of electric vehicles.
为达到上述目的，本发明的技术方案是这样实现的：In order to achieve the above objective, the technical scheme of the present invention is achieved as follows:
一种电动汽车的高压上电控制***，包括：整车高压回路，包括电池包以及由所述电池包供电的母线电容和高压零部件；以及上述的电动汽车的预充控制***。A high-voltage power-on control system for an electric vehicle includes: a high-voltage circuit of the entire vehicle, including a battery pack, bus capacitors and high-voltage components powered by the battery pack; and the above-mentioned precharge control system for the electric vehicle.
所述电动汽车的高压上电控制***与上述电动汽车的预充控制***相对于现有技术所具有的优势相同，在此不再赘述。The high-voltage power-on control system of the electric vehicle has the same advantages as the above-mentioned pre-charge control system of the electric vehicle over the prior art, which will not be repeated here.
本发明的其它特征和优点将在随后的具体实施方式部分予以详细说明。Other features and advantages of the present invention will be described in detail in the following specific embodiments.
附图说明Description of the drawings
构成本发明的一部分的附图用来提供对本发明的进一步理解，本发明的示意性实施方式及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：The drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the exemplary embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:
图1是本发明实施例的电动汽车的预充控制***的功能架构示意图；FIG. 1 is a schematic diagram of the functional architecture of a pre-charge control system for an electric vehicle according to an embodiment of the present invention;
图2是本发明实施例中DCDC转换器的反向预充电路的工作原 理示意图；Fig. 2 is a schematic diagram of the working principle of the reverse precharging circuit of the DCDC converter in the embodiment of the present invention;
图3是本发明另一实施例的电动汽车的预充控制方法的流程示意图；以及FIG. 3 is a schematic flowchart of a precharge control method for an electric vehicle according to another embodiment of the present invention; and
图4是应用本发明实施例的电动汽车预充控制方法的示例的流程示意图。Fig. 4 is a schematic flowchart of an example of an electric vehicle pre-charging control method to which an embodiment of the present invention is applied.
附图标记说明：Description of reference signs:
1、主正接触器；2、主负接触器；3、保险丝；4、加热继电器；5、加热电阻；110、电池管理***；120、DCDC转换器；130、低压蓄电池；140、整车控制器。1. Main positive contactor; 2. Main negative contactor; 3. Fuse; 4. Heating relay; 5. Heating resistor; 110, battery management system; 120, DCDC converter; 130, low-voltage battery; 140, vehicle control Device.
具体实施方式Detailed ways
需要说明的是，在不冲突的情况下，本发明中的实施方式及实施方式中的特征可以相互组合。It should be noted that the embodiments of the present invention and the features of the embodiments can be combined with each other if there is no conflict.
另外，在本发明实施例中，所述“预充”是指母线电容进行预充，而DC-link与母线电容可互换进行理解。另外，在本发明实施例中，参考图1所示出的电路结构，目标电压、所述母线电容两端的电压、接触器两端电压、DCDC转换器的高压侧电压、高压零部件高压侧电压是相同的，可互换进行理解。In addition, in the embodiment of the present invention, the “pre-charge” refers to the pre-charge of the bus capacitor, and the DC-link and the bus capacitor are interchangeable for understanding. In addition, in the embodiment of the present invention, referring to the circuit structure shown in FIG. 1, the target voltage, the voltage across the bus capacitor, the voltage across the contactor, the high-voltage side voltage of the DCDC converter, and the high-voltage side voltage of the high-voltage components They are the same and can be understood interchangeably.
下面将参考附图并结合实施方式来详细说明本发明。Hereinafter, the present invention will be described in detail with reference to the drawings and in conjunction with the embodiments.
图1是本发明实施例的电动汽车的预充控制***的功能架构示意图，该预充控制***应用于整车高压回路，其中所述整车高压回路包括电池包以及由所述电池包供电的母线电容和高压零部件，且所述高压零部件包括电动加热器(例如PTC加热器)、电动压缩机(Compressor，CMP)、电机控制器(Motor Control Unit，MCU)等等，其中电动加热器例如正温度系数(Positive Temperature Coefficient， PTC)加热器。如图1所示，DC-link电容及高电压零部件并联在所述电池包的供电侧。其中，所述电池包为常规动力电池包，其包括如图1所示的主正接触器1、主负接触器2、保险丝3、加热继电器4、加热电阻5。本发明实施例中，将主正接触器1和主负接触器2统称为接触器。1 is a schematic diagram of the functional architecture of a pre-charge control system for an electric vehicle according to an embodiment of the present invention. The pre-charge control system is applied to a high-voltage circuit of a whole vehicle, wherein the high-voltage circuit of the whole vehicle includes a battery pack and a battery powered by the battery pack. Bus capacitors and high-voltage components, and the high-voltage components include electric heaters (such as PTC heaters), electric compressors (Compressor, CMP), motor controllers (Motor Control Unit, MCU), etc., among which electric heaters For example, a positive temperature coefficient (PTC) heater. As shown in Figure 1, the DC-link capacitor and high-voltage components are connected in parallel on the power supply side of the battery pack. Wherein, the battery pack is a conventional power battery pack, which includes a main positive contactor 1, a main negative contactor 2, a fuse 3, a heating relay 4, and a heating resistor 5 as shown in FIG. 1. In the embodiment of the present invention, the main positive contactor 1 and the main negative contactor 2 are collectively referred to as contactors.
参考图1，本发明实施例所述的电动汽车的预充控制***包括：用于管理所述电池包的电池管理***(Battery Management System，BMS)110；用于对所述母线电容进行预充的DCDC转换器120，且该DCDC转换器连接有低压蓄电池130；以及用于控制所述BMS和所述DCDC转换器的整车控制器140。其中，所述整车控制器140还用于向所述DCDC转换器120发送预充指令，且所述DCDC转换器120还用于响应所述预充指令而将所述低压蓄电池130的电能逆变成高压电，并输出该高压电至所述整车高压回路以对所述母线电容进行预充。1, the precharge control system for an electric vehicle according to an embodiment of the present invention includes: a battery management system (Battery Management System, BMS) 110 for managing the battery pack; for precharging the bus capacitor The DCDC converter 120 is connected with a low-voltage battery 130; and a vehicle controller 140 for controlling the BMS and the DCDC converter. Wherein, the vehicle controller 140 is also used to send a pre-charge command to the DCDC converter 120, and the DCDC converter 120 is also used to reverse the electric energy of the low-voltage battery 130 in response to the pre-charge command. It becomes high-voltage electricity, and outputs the high-voltage electricity to the high-voltage circuit of the whole vehicle to pre-charge the bus capacitor.
其中，整车控制器可以通过动力驱动总线(Power Train CAN，PT CAN)向BMS 110、DCDC转换器120及高压零部件等发送控制指令。整车控制器可以是HCU(Hybird Control Unit，可称为混合动力整车控制器)或VCU(Vehicle Control Unit，可称为电动汽车整车控制器)，本发明实施例以VCU为例。Among them, the vehicle controller can send control commands to the BMS 110, the DCDC converter 120, and high-voltage components through the Power Train CAN (PT CAN). The vehicle controller may be an HCU (Hybird Control Unit, which may be referred to as a hybrid vehicle controller) or a VCU (Vehicle Control Unit, which may be referred to as an electric vehicle controller). The embodiment of the present invention takes the VCU as an example.
其中，所述DCDC转换器即是直流-直流电流转换器，当低压蓄电池130例如为12V蓄电池时，该DCDC转换器通过自身的反向预充电路对12V的低压进行逆变升压，以得到需要的高压电。Wherein, the DCDC converter is a DC-DC current converter. When the low-voltage battery 130 is, for example, a 12V battery, the DCDC converter uses its own reverse precharging circuit to invert and boost the 12V low voltage to obtain The high voltage electricity needed.
举例而言，图2是本发明实施例中DCDC转换器的反向预充电路的工作原理示意图，其中C1-C3表示三个母线电容，C3即对应为母线电容(DC-link)。在图2中，除低压蓄电池130和三个母线电 容C1-C3之外的其他元器件所构成的电路可理解为DCDC转换器自身的反向预充电路，其实现了将低压蓄电池130所输出的电压进行逆变升压以得到高电压来向母线电容进行预充。其中，DCDC转换器自身的反向预充电路是常规的，可参考图2知悉各个元器件之间的连接关系，故在此不再对其构成及连接关系进行赘述。For example, FIG. 2 is a schematic diagram of the working principle of the reverse precharging circuit of the DCDC converter in the embodiment of the present invention, where C1-C3 represent three bus capacitors, and C3 corresponds to the bus capacitor (DC-link). In Figure 2, the circuit composed of components other than the low-voltage battery 130 and the three bus capacitors C1-C3 can be understood as the reverse precharging circuit of the DCDC converter itself, which realizes the output of the low-voltage battery 130 The voltage is inverted and boosted to obtain a high voltage to pre-charge the bus capacitor. Among them, the reverse precharging circuit of the DCDC converter itself is conventional, and the connection relationship between the various components can be known with reference to FIG. 2, so its structure and connection relationship will not be described here.
通过上文可知，本发明实施例的电动汽车的预充控制***通过DCDC转换器将蓄电池的低压电逆变成高压电，并输出至整车高压回路以完成对母线电容的充电，从而实现预充功能。这一预充控制***没有另外配置预充接触器及预充电阻，通过现有整车控制器及DCDC转换器就实现了低压供电***预充高压上电方案，既能满足功能需求，又能节约开发成本。It can be seen from the above that the pre-charge control system of the electric vehicle of the embodiment of the present invention inverts the low-voltage power of the battery into high-voltage power through the DCDC converter, and outputs it to the high-voltage circuit of the vehicle to complete the charging of the bus capacitor, thereby achieving Pre-charge function. This pre-charge control system does not have an additional pre-charge contactor and pre-charge resistor. The low-voltage power supply system pre-charge and high-voltage power-on program is realized through the existing vehicle controller and DCDC converter, which can not only meet the functional requirements, but also Save development costs.
图3是本发明另一实施例的电动汽车的预充控制方法的流程示意图，该预充控制方法应用于上述实施例的预充控制***，可理解为上述预充控制***借助于DCDC转换器反向功能实现预充功能的软件实现方式。如图3所示，所述电动汽车的预充控制方法可以包括以下步骤：FIG. 3 is a schematic flowchart of a precharge control method for an electric vehicle according to another embodiment of the present invention. The precharge control method is applied to the precharge control system of the above embodiment, and it can be understood that the above precharge control system uses a DCDC converter The reverse function realizes the software implementation of the pre-charge function. As shown in FIG. 3, the precharge control method of the electric vehicle may include the following steps:
步骤S310，所述整车控制器向所述DCDC转换器发送预充指令。In step S310, the vehicle controller sends a pre-charge instruction to the DCDC converter.
步骤S320，所述DCDC转换器响应所述预充指令而将所述低压蓄电池的电能逆变成高压电，并输出该高压电至所述整车高压回路以对所述母线电容进行预充。Step S320, the DCDC converter inverts the electric energy of the low-voltage battery into high-voltage electricity in response to the pre-charge instruction, and outputs the high-voltage electricity to the high-voltage circuit of the vehicle to pre-charge the bus capacitor. Charge.
其中，所述DCDC转换器可根据需求，只将所述低压蓄电池的部分电能逆变成高压电。Wherein, the DCDC converter can invert only part of the electric energy of the low-voltage battery into high-voltage electricity according to demand.
在优选的实施例中，对于步骤S320，在对所述母线电容进行预充的过程中，还可以包括：In a preferred embodiment, for step S320, the process of precharging the bus capacitor may further include:
步骤S321，所述整车控制器基于设定的目标电压上升速率向所 述DCDC转换器发送预充目标电压值。In step S321, the vehicle controller sends a precharge target voltage value to the DCDC converter based on the set target voltage rise rate.
其中，所述目标电压即母线电容两端的电压，设定的目标电压上升速率可使得目标电压在上升的每一阶段对应一个梯度值。Wherein, the target voltage is the voltage across the bus capacitor, and the set target voltage rising rate can make the target voltage corresponding to a gradient value at each stage of rising.
步骤S322，所述DCDC转换器基于接收到的所述预充目标电压值进行对所述母线电容的预充。In step S322, the DCDC converter precharges the bus capacitor based on the received precharge target voltage value.
对于步骤S321和步骤S322，举例而言，所述整车控制器在发送所述预充指令之后，实时监测目标电压，并根据期望的目标电压上升速率向所述DCDC转换器发送预充目标电压值，使得所述DCDC根据接收到的预充目标电压值进行电压转换，从而可以保证目标电压例如以期望的梯度缓慢上升，避免预充过快而损坏母线电容。其中，该预充目标电压值用于标志预充完成For step S321 and step S322, for example, after sending the precharge instruction, the vehicle controller monitors the target voltage in real time, and sends the precharge target voltage to the DCDC converter according to the desired target voltage rise rate Value, so that the DCDC performs voltage conversion according to the received precharge target voltage value, so as to ensure that the target voltage rises slowly with a desired gradient, for example, to avoid precharging too fast and damaging the bus capacitor. Among them, the pre-charge target voltage value is used to mark the completion of pre-charge
优选地，继续参考图3，在步骤S310和步骤S320的基础上，本发明实施例的预充控制方法还可进一步包括：Preferably, continuing to refer to FIG. 3, on the basis of step S310 and step S320, the precharge control method of the embodiment of the present invention may further include:
步骤S330，所述整车控制器判断所述母线电容两端的电压是否达到所述预充目标电压值，若是，则向所述BMS发送接触器闭合指令。In step S330, the vehicle controller determines whether the voltage across the bus capacitor reaches the precharge target voltage value, and if so, sends a contactor closing instruction to the BMS.
步骤S340，所述BMS响应于所述接触器闭合指令闭合所述电池包中的接触器。In step S340, the BMS closes the contactor in the battery pack in response to the contactor closing instruction.
其中，在步骤S330中，所述整车控制器判断所述母线电容两端的电压值是否达到所述预充目标电压值优选为可以包括：Wherein, in step S330, the vehicle controller determining whether the voltage value across the bus capacitor reaches the precharge target voltage value may preferably include:
步骤S331，所述整车控制器接收所述DCDC转换器反馈的该DCDC转换器的高压侧电压，或者所述整车控制器接收所述高压零部件反馈的各个高压零部件的高压侧电压。In step S331, the vehicle controller receives the high voltage side voltage of the DCDC converter fed back by the DCDC converter, or the vehicle controller receives the high voltage side voltage of each high voltage component fed back by the high voltage component.
其中所述DCDC转换器的高压侧电压、所述各个高压零部件的高压侧电压均与所述母线电容两端的电压相等。The high-voltage side voltage of the DCDC converter and the high-voltage side voltage of each high-voltage component are all equal to the voltage across the bus capacitor.
步骤S332，所述整车控制器将所接收的高压侧电压与所述预充目标电压值进行比较以判断所述母线电容两端的电压值是否达到所述预充目标电压值。In step S332, the vehicle controller compares the received high-voltage side voltage with the pre-charge target voltage value to determine whether the voltage value across the bus capacitor reaches the pre-charge target voltage value.
需说明的是，对于步骤S340，在预充过程中，主正接触器和/或主负接触器打开以避免提前高压上电，而预充完成后，响应于接触器闭合指令，主正接触器和主负接触器均闭合，使得BMS处于待机状态，以等待整车控制器的指令来控制整车进入高压状态。优选地，将接触器闭合指令进一步限定为主正接触器闭合指令，而BMS对应只关闭主正接触器。It should be noted that for step S340, during the pre-charging process, the main positive contactor and/or the main negative contactor are opened to avoid high-voltage power-on in advance, and after the pre-charging is completed, in response to the contactor closing instruction, the main positive contact Both the inverter and the main negative contactor are closed, so that the BMS is in a standby state, waiting for instructions from the vehicle controller to control the vehicle to enter a high-voltage state. Preferably, the contactor closing command is further defined as the main positive contactor closing command, and the BMS corresponds to only closing the main positive contactor.
在优选的实施例中，电池包本身具有判断能否闭合接触器的机制。即，对于步骤S340，具体可包括：所述BMS检测所述电池包的接触器两端电压是否满足接触器闭合条件，若满足则闭合所述接触器。举例而言，所述接触器闭合条件包括母线电容两端的电压以及各控制器高压侧电压与BMS电池包端电压值差值小于设定值(例如2V)。In a preferred embodiment, the battery pack itself has a mechanism to determine whether the contactor can be closed. That is, for step S340, it may specifically include: the BMS detects whether the voltage at both ends of the contactor of the battery pack meets the contactor closing condition, and if so, the contactor is closed. For example, the contactor closing condition includes the voltage across the bus capacitor and the difference between the high voltage side voltage of each controller and the BMS battery pack terminal voltage is less than a set value (for example, 2V).
优选地，继续参考图3，在步骤S310-S340的基础上，本发明实施例的预充控制方法还可进一步包括：Preferably, continuing to refer to FIG. 3, on the basis of steps S310-S340, the precharge control method of the embodiment of the present invention may further include:
步骤S350，所述BMS在闭合所述接触器后，若接收到所述整车控制器发送的高压上电指令，则执行所述高压上电指令以使整车进入高压状态。In step S350, after the BMS closes the contactor, if it receives a high-voltage power-on instruction sent by the vehicle controller, it executes the high-voltage power-on instruction to make the vehicle enter a high-voltage state.
举例而言，所述整车控制器可以在发送接触器闭合指令的同时或之后(例如接收到主正接触器已闭合的反馈之后)发送高压上电指令，或者接触器闭合指令和高压上电指令可集成为同一指令。For example, the vehicle controller may send a high-voltage power-on command at the same time or after sending a contactor closing command (for example, after receiving a feedback that the main positive contactor has been closed), or a contactor closing command and a high-voltage power-on command Instructions can be integrated into the same instruction.
更为优选地，继续参考图3，在步骤S310-S350的基础上，本发明实施例的预充控制方法还可进一步包括：More preferably, with continued reference to FIG. 3, on the basis of steps S310-S350, the precharge control method of the embodiment of the present invention may further include:
步骤S360，所述BMS向所述整车控制器发送关于整车已进入高 压状态的反馈。In step S360, the BMS sends feedback to the vehicle controller that the vehicle has entered a high pressure state.
步骤S370，所述整车控制器响应于所述反馈向DCDC转换器发送待机指令。In step S370, the vehicle controller sends a standby instruction to the DCDC converter in response to the feedback.
其中，所述待机指令指示进入Standby状态。Wherein, the standby instruction indicates to enter the Standby state.
步骤S380，所述DCDC转换器响应于所述待机指令停止预充过程。In step S380, the DCDC converter stops the pre-charging process in response to the standby instruction.
其中，所述DCDC转换器在停止预充过程之后，进入待机(Standby)工作模式。Wherein, the DCDC converter enters a standby (Standby) working mode after stopping the precharging process.
综合上述步骤S310-S380，本发明实施例的电动汽车的预充控制方法通过软件策略实现了高压上电的预充过程，方案易于实现，且有利于节约整车开发成本。但是，步骤S310-S380的正常执行需建立在整车高压回路及预充控制***正常的基础上。Based on the above steps S310-S380, the pre-charge control method of the electric vehicle in the embodiment of the present invention implements the pre-charge process of high-voltage power-on through a software strategy, the solution is easy to implement, and is beneficial to saving the development cost of the entire vehicle. However, the normal execution of steps S310-S380 needs to be established on the basis of the normal high-voltage circuit and pre-charge control system of the vehicle.
对此，在优选的实施例中，所述预充控制方法还可以在步骤S310之前包括：所述BMS及所述DCDC转换器各自进行自检；以及所述整车控制器检测所述高压零部件的状态是否正常以及检测所述低压蓄电池的电量是否大于设定值。即，增加了关于BMS、DCDC转换器、整车控制器的预检环节。关于这一预检环节的细节将在下文结合示例进行描述，在此则不再赘述。In this regard, in a preferred embodiment, the pre-charge control method may further include before step S310: the BMS and the DCDC converter each perform a self-test; and the vehicle controller detects the high-voltage zero Whether the state of the component is normal and whether the power of the low-voltage battery is greater than a set value is detected. That is, the pre-inspection link for BMS, DCDC converter, and vehicle controller has been added. The details of this pre-inspection link will be described below in conjunction with examples, and will not be repeated here.
图4是应用本发明实施例的电动汽车预充控制方法的示例的流程示意图。该示例中，电动汽车例如采用KL15电激活模式，该模式下发动机已启动(即，处于RUN模式)，且对应的汽车功能包括启动功能、空调功能、升降车窗功能等。如图4所示，在BMS、整车控制器VCU和DCDC转换器各自完成初始化之后，由三者构成的预充控制***所执行的预充控制方法包括以下步骤：Fig. 4 is a schematic flowchart of an example of an electric vehicle pre-charging control method to which an embodiment of the present invention is applied. In this example, the electric car adopts the KL15 electric activation mode, in which the engine is started (ie, in the RUN mode), and the corresponding car functions include start-up function, air-conditioning function, lift window function, etc. As shown in Figure 4, after the BMS, the vehicle controller VCU, and the DCDC converter are initialized respectively, the pre-charge control method executed by the pre-charge control system composed of the three includes the following steps:
步骤S401，BMS检测是否存在异常，若是则反馈BMS错误信 息，否则BMS向VCU上报其处于Standby状态。In step S401, the BMS detects whether there is an abnormality, and if so, it feeds back the BMS error information, otherwise the BMS reports that it is in the Standby state to the VCU.
步骤S402，DCDC转换器检测是否存在异常，若是则反馈DCDC转换器错误信息，否则DCDC转换器向VCU上报其处于Standby状态。In step S402, the DCDC converter detects whether there is an abnormality, and if so, feeds back the error information of the DCDC converter, otherwise the DCDC converter reports that it is in the Standby state to the VCU.
步骤S403，VCU检测各高压零部件的状态是否正常，若不正常则通知上电失败，若正常则执行步骤S404。In step S403, the VCU detects whether the state of each high-voltage component is normal, if it is not normal, it will notify the power-on failure, and if it is normal, step S404 will be executed.
步骤S404，VCU检测12V铅酸蓄电池电量是否大于80％，若是则执行步骤S405，否则通知上电失败。In step S404, the VCU detects whether the 12V lead-acid battery has a power greater than 80%, and if so, executes step S405, otherwise it notifies the power-on failure.
其中，80％为标定值，可根据实际需求进行调整。Among them, 80% is the calibration value, which can be adjusted according to actual needs.
步骤S405，VCU向DCDC转换器发送预充指令。In step S405, the VCU sends a pre-charge instruction to the DCDC converter.
步骤S406，DCDC转换器接受预充指令。In step S406, the DCDC converter accepts the precharge instruction.
步骤S407，DCDC转换器检测其高压侧电压并反馈给VCU。In step S407, the DCDC converter detects its high voltage side voltage and feeds it back to the VCU.
步骤S408，VCU接收DCDC转换器及各高压零部件的高压侧电压。In step S408, the VCU receives the high-voltage side voltage of the DCDC converter and each high-voltage component.
步骤S409，VCU按照设定的目标电压上升速率发送预充目标电压值至预充完成。In step S409, the VCU sends the pre-charge target voltage value until the pre-charge is completed according to the set target voltage rising rate.
步骤S410，DCDC转换器开始预充直至与VCU发送的预充目标电压值一致。In step S410, the DCDC converter starts to precharge until it is consistent with the precharge target voltage value sent by the VCU.
步骤S411，VCU检测预充是否完成，若是则执行步骤S412。In step S411, the VCU detects whether the precharge is completed, and if so, executes step S412.
步骤S412，VCU发送接触器闭合指令至BMS，并转到步骤S414。In step S412, the VCU sends a contactor closing instruction to the BMS, and then goes to step S414.
步骤S413，BMS检测接触器两端电压。In step S413, the BMS detects the voltage across the contactor.
步骤S414，BMS接收接触器闭合指令。Step S414, the BMS receives the contactor closing instruction.
步骤S415，BMS判定接触器两端电压满足接触器闭合条件，并据此闭合接触器以开始高压上电。In step S415, the BMS determines that the voltage across the contactor meets the contactor closing condition, and closes the contactor accordingly to start high-voltage power-on.
步骤S416，BMS完成上电并反馈上电完成信号给VCU。In step S416, the BMS completes power-on and feeds back a power-on completion signal to the VCU.
步骤S417，VCU接收上电完成信号，并向DCDC转换器发送进入Standby模式的指令。In step S417, the VCU receives the power-on completion signal, and sends an instruction to enter the Standby mode to the DCDC converter.
步骤S418，DCDC转换器接收VCU的指令而进入Standby模式。In step S418, the DCDC converter receives the instruction from the VCU and enters the Standby mode.
步骤S419，VCU向DCDC转换器发送进入BUCK模式的指令Step S419, the VCU sends an instruction to enter the BUCK mode to the DCDC converter
其中，BUCK模式为降压模式，而前述DCDC转换器进行逆变升压的模式称为BOOST模式，该BOOST模式即为升压模式。Among them, the BUCK mode is a step-down mode, and the aforementioned DCDC converter performs an inverter boost mode called a BOOST mode, and the BOOST mode is a boost mode.
步骤S420，DCDC转换器接收VCU的指令而进入BUCK模式。In step S420, the DCDC converter receives the instruction from the VCU and enters the BUCK mode.
步骤S421，VCU进入RUN状态，并将仪表上的READY灯点亮。In step S421, the VCU enters the RUN state and lights up the READY light on the meter.
最终，BMS进入驱动(Drive)模式，VCU上电完成，DCDC转换器进入BUCK模式。即，通过上述步骤S401-S421，在仅依靠现有控制器(VCU和BMS)的情况下，借助DCDC转换器的反向功能完成了对母线电容的预充，并进一步实现了高压上电，有利于节约整车开发成本。Finally, the BMS enters the Drive mode, the VCU is powered on, and the DCDC converter enters the BUCK mode. That is, through the above steps S401-S421, under the condition of relying only on the existing controllers (VCU and BMS), the pre-charge of the bus capacitor is completed by the reverse function of the DCDC converter, and the high-voltage power-on is further realized. It is conducive to saving the development cost of the whole vehicle.
需说明的是，VCU、DCDC转换器及BMS可通过运行程序的方式来执行它们各自对应的步骤。相应程序可存储在存储器中，存储器可能包括计算机可读介质中的非永久性存储器，随机存取存储器(RAM)和/或非易失性内存等形式，如只读存储器(ROM)或闪存(flash RAM)。存储器是计算机可读介质的示例，则计算机可读介质包括永久性和非永久性、可移动和非可移动媒体可以由任何方法或技术来实现信息存储。信息可以是计算机可读指令、数据结构、程序的模块或其他数据。计算机的存储介质的例子包括，但不限于相变内存(PRAM)、静态随机存取存储器(SRAM)、动态随机存取存储器(DRAM)、其他类型的随机存取存储器(RAM)、只读存储器(ROM)、电可擦除可编程只读存储器(EEPROM)、快闪记忆体或其他内存技 术、只读光盘只读存储器(CD-ROM)、数字多功能光盘(DVD)或其他光学存储、磁盒式磁带，磁带磁磁盘存储或其他磁性存储设备或任何其他非传输介质，可用于存储可以被计算设备访问的信息。It should be noted that the VCU, DCDC converter, and BMS can execute their respective steps by running programs. The corresponding program can be stored in the memory, and the memory may include non-permanent memory in computer readable media, random access memory (RAM) and/or non-volatile memory, such as read-only memory (ROM) or flash memory ( flash RAM). The memory is an example of a computer-readable medium, and the computer-readable medium includes permanent and non-permanent, removable and non-removable media, and information storage can be realized by any method or technology. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, CD-ROM, digital versatile disc (DVD) or other optical storage, Magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media can be used to store information that can be accessed by computing devices.
本发明又一实施例提供了一种电动汽车的高压上电控制***，该所述电动汽车的高压上电控制***的结构同样可参考图1，其包括：整车高压回路，包括电池包以及由所述电池包供电的母线电容和高压零部件；以及上述实施例所述的电动汽车的预充控制***。Another embodiment of the present invention provides a high-voltage power-on control system of an electric vehicle. The structure of the high-voltage power-on control system of the electric vehicle can also refer to FIG. 1, which includes: a high-voltage circuit of the entire vehicle, including a battery pack, and The bus capacitor and high-voltage components powered by the battery pack; and the pre-charge control system of the electric vehicle described in the above embodiment.
关于该高压上电控制***的实施细节可参考前述实施例，在此则不再赘述。For the implementation details of the high-voltage power-on control system, reference may be made to the foregoing embodiment, which will not be repeated here.
以上结合附图详细描述了本发明实施方式的可选实施方式，但是，本发明实施方式并不限于上述实施方式中的具体细节，在本发明实施方式的技术构思范围内，可以对本发明实施方式的技术方案进行多种简单变型，例如交换部分步骤的执行顺序，这些简单变型均属于本发明实施方式的保护范围。The above describes the optional implementation manners of the embodiments of the present invention in detail with reference to the accompanying drawings. However, the implementation manners of the present invention are not limited to the specific details in the above-mentioned embodiments. Within the scope of the technical concept of the embodiments of the present invention, the embodiments of the present invention can be compared. Various simple modifications are made to the technical solution, such as exchanging the execution order of some steps, and these simple modifications all fall within the protection scope of the embodiments of the present invention.
还需要说明的是，术语“包括”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、商品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、商品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括要素的过程、方法、商品或者设备中还存在另外的相同要素。It should also be noted that the term "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, commodity or equipment including a series of elements not only includes those elements, but also includes those elements that are not explicitly listed. Other elements of, or also include elements inherent to this process, method, commodity or equipment. If there are no more restrictions, the element defined by the sentence "including a..." does not exclude the existence of other identical elements in the process, method, commodity or equipment that includes the element.
以上所述仅为本发明的较佳实施方式而已，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the present invention. Within the scope of protection.

Claims (10)

  1. 一种电动汽车的预充控制***，其特征在于，应用于整车高压回路，且该整车高压回路包括电池包以及由所述电池包供电的母线电容和高压零部件，所述电动汽车的预充控制***包括：A precharge control system for an electric vehicle is characterized in that it is applied to a high-voltage circuit of a vehicle, and the high-voltage circuit of the vehicle includes a battery pack, a bus capacitor and high-voltage components powered by the battery pack, and the electric vehicle The pre-charge control system includes:
    用于管理所述电池包的电池管理***BMS；A battery management system BMS for managing the battery pack;
    用于对所述母线电容进行预充的直流-直流DCDC转换器，且该DCDC转换器连接有低压蓄电池；以及A DC-DC DCDC converter for precharging the bus capacitor, and the DCDC converter is connected with a low-voltage battery; and
    用于控制所述BMS和所述DCDC转换器的整车控制器；A vehicle controller for controlling the BMS and the DCDC converter;
    其中，所述整车控制器还用于向所述DCDC转换器发送预充指令，且所述DCDC转换器还用于响应所述预充指令而将所述低压蓄电池的电能逆变成高压电，并输出该高压电至所述整车高压回路以对所述母线电容进行预充。Wherein, the vehicle controller is also used to send a pre-charge instruction to the DCDC converter, and the DCDC converter is also used to invert the electrical energy of the low-voltage battery into a high-voltage in response to the pre-charge instruction And output the high-voltage power to the high-voltage circuit of the whole vehicle to pre-charge the bus capacitor.
  2. 一种电动汽车的预充控制方法，其特征在于，应用于权利要求1所述的电动汽车的预充控制***，且所述电动汽车的预充控制方法包括：A precharge control method for an electric vehicle, characterized in that it is applied to the precharge control system for an electric vehicle according to claim 1, and the precharge control method for an electric vehicle includes:
    所述整车控制器向所述DCDC转换器发送预充指令；以及The vehicle controller sends a precharge instruction to the DCDC converter; and
    所述DCDC转换器响应所述预充指令而将所述低压蓄电池的电能逆变成高压电，并输出该高压电至所述整车高压回路以对所述母线电容进行预充。The DCDC converter inverts the electric energy of the low-voltage battery into high-voltage electricity in response to the pre-charge instruction, and outputs the high-voltage electricity to the high-voltage circuit of the entire vehicle to pre-charge the bus capacitor.
  3. 根据权利要求2所述的电动汽车的预充控制方法，其特征在于，在所述对所述母线电容进行预充的过程中，所述电动汽车的预充控制方法还包括：The precharging control method of an electric vehicle according to claim 2, wherein, in the process of precharging the bus capacitor, the precharging control method of the electric vehicle further comprises:
    所述整车控制器基于设定的目标电压上升速率向所述DCDC转 换器发送预充目标电压值，该预充目标电压值用于标志预充完成；以及The vehicle controller sends a precharge target voltage value to the DCDC converter based on the set target voltage rise rate, and the precharge target voltage value is used to mark the completion of the precharge; and
    所述DCDC转换器基于接收到的所述预充目标电压值进行对所述母线电容的预充。The DCDC converter precharges the bus capacitor based on the received precharge target voltage value.
  4. 根据权利要求3所述的电动汽车的预充控制方法，其特征在于，所述预充控制方法还包括：The precharge control method for an electric vehicle according to claim 3, wherein the precharge control method further comprises:
    所述整车控制器判断所述母线电容两端的电压是否达到所述预充目标电压值，若是，则向所述BMS发送接触器闭合指令；以及The vehicle controller determines whether the voltage across the bus capacitor reaches the precharge target voltage value, and if so, sends a contactor closing instruction to the BMS; and
    所述BMS响应于所述接触器闭合指令闭合所述电池包中的接触器。The BMS closes the contactor in the battery pack in response to the contactor closing instruction.
  5. 根据权利要求4所述的电动汽车的预充控制方法，其特征在于，所述整车控制器判断所述母线电容两端的电压值是否达到所述预充目标电压值包括：The precharge control method for an electric vehicle according to claim 4, wherein the vehicle controller determining whether the voltage value across the bus capacitor reaches the precharge target voltage value comprises:
    所述整车控制器接收所述DCDC转换器反馈的该DCDC转换器的高压侧电压，或者所述整车控制器接收所述高压零部件反馈的各个高压零部件的高压侧电压，其中所述DCDC转换器的高压侧电压和所述各个高压零部件的高压侧电压均与所述母线电容两端的电压相等；以及The vehicle controller receives the high-voltage side voltage of the DCDC converter fed back by the DCDC converter, or the vehicle controller receives the high-voltage side voltage of each high-voltage component fed back by the high-voltage component, wherein the The high-voltage side voltage of the DCDC converter and the high-voltage side voltage of each high-voltage component are equal to the voltage across the bus capacitor; and
    所述整车控制器将所接收的高压侧电压与所述预充目标电压值进行比较以判断所述母线电容两端的电压值是否达到所述预充目标电压值。The vehicle controller compares the received high-voltage side voltage with the pre-charge target voltage value to determine whether the voltage value at both ends of the bus capacitor reaches the pre-charge target voltage value.
  6. 根据权利要求4所述的电动汽车的预充控制方法，其特征在于，所述BMS响应于所述接触器闭合指令闭合所述电池包中的接触 器包括：The precharge control method for an electric vehicle according to claim 4, wherein the BMS closing the contactor in the battery pack in response to the contactor closing instruction comprises:
    所述BMS检测所述电池包的接触器两端电压是否满足接触器闭合条件，若满足则闭合所述接触器。The BMS detects whether the voltage at both ends of the contactor of the battery pack meets the contactor closing condition, and closes the contactor if so.
  7. 根据权利要求6所述的电动汽车的预充控制方法，其特征在于，所述预充控制方法还包括：The precharge control method for an electric vehicle according to claim 6, wherein the precharge control method further comprises:
    所述BMS在闭合所述接触器后，若接收到所述整车控制器发送的高压上电指令，则执行所述高压上电指令以使整车进入高压状态。After the BMS closes the contactor, if it receives a high-voltage power-on instruction sent by the vehicle controller, it executes the high-voltage power-on instruction to make the vehicle enter a high-voltage state.
  8. 根据权利要求7所述的电动汽车的预充控制方法，其特征在于，所述预充控制方法还包括：The precharge control method for an electric vehicle according to claim 7, wherein the precharge control method further comprises:
    所述BMS向所述整车控制器发送关于整车已进入高压状态的反馈；The BMS sends feedback to the vehicle controller that the vehicle has entered a high-voltage state;
    所述整车控制器响应于所述反馈向DCDC转换器发送待机指令；以及The vehicle controller sends a standby command to the DCDC converter in response to the feedback; and
    所述DCDC转换器响应于所述待机指令停止预充过程。The DCDC converter stops the precharge process in response to the standby instruction.
  9. 根据权利要求2至8中任意一项所述的电动汽车的预充控制方法，其特征在于，在所述整车控制器向所述DCDC转换器发送预充指令之前，所述电动汽车的预充控制方法还包括：The pre-charge control method for an electric vehicle according to any one of claims 2 to 8, wherein before the vehicle controller sends a pre-charge command to the DCDC converter, the pre-charge control method of the electric vehicle The charging control method also includes:
    所述BMS及所述DCDC转换器各自进行自检；以及The BMS and the DCDC converter each perform a self-check; and
    所述整车控制器检测所述高压零部件的状态是否正常以及检测所述低压蓄电池的电量是否大于设定值。The vehicle controller detects whether the state of the high-voltage component is normal and whether the power of the low-voltage battery is greater than a set value.
  10. 一种电动汽车的高压上电控制***，其特征在于，所述电动汽车的高压上电控制***包括：A high-voltage power-on control system for an electric vehicle is characterized in that the high-voltage power-on control system for an electric vehicle includes:
    整车高压回路，包括电池包以及由所述电池包供电的母线电容和高压零部件；以及The high-voltage circuit of the entire vehicle, including the battery pack and the bus capacitors and high-voltage components powered by the battery pack; and
    权利要求1所述的电动汽车的预充控制***。The pre-charging control system of an electric vehicle according to claim 1.
PCT/CN2021/070911 2020-01-10 2021-01-08 Pre-charging control system and method for electric vehicle and high-voltage power-on control system WO2021139782A1 (en)

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