CN112319227A - High-voltage interlocking control system and method for pure electric vehicle - Google Patents
High-voltage interlocking control system and method for pure electric vehicle Download PDFInfo
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- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
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Abstract
The invention provides a high-voltage interlocking control system and a high-voltage interlocking control method for a pure electric vehicle, wherein the high-voltage interlocking control system comprises a VCU high-voltage interlocking loop 1, and the VCU high-voltage interlocking loop 1 comprises a DC/DC converter, high-voltage input and output line connectors of the DC/AC converter and input connectors of a steering oil pump motor and an air compressor; the high-voltage interlocking circuit 2 comprises a high-voltage distribution box, a high-voltage connector, an air-conditioning compressor input connector and a PTC input connector, wherein the high-voltage distribution box outputs to the air-conditioning compressor and the PTC; the device also comprises a VCU high-voltage interlocking loop 3, wherein the VCU high-voltage interlocking loop 3 comprises a high-voltage box and a battery pack opening detection device; the invention changes the existing mode of acquiring the high-voltage interlocking signals of the whole system only through the VCU into a plurality of high-voltage interlocking loops, can improve the driving experience of drivers, reduces the calculation redundancy of the VCU, and is beneficial to troubleshooting and overhauling of faults.
Description
Technical Field
The invention relates to the technical field of new energy automobile safety control, in particular to a pure electric automobile high-voltage interlocking control system and method.
Background
With the rapid development of economy, the problems of energy and environmental protection are increasingly prominent, and all countries in the world begin to aim at energy-saving and environment-friendly pure electric vehicles.
The pure electric vehicle is an electric vehicle which is completely driven by electric power provided by a storage battery, and the working voltage is up to hundreds of volts and is far higher than the safety voltage. When the high-voltage system works, the discharge current can reach tens of amperes, even hundreds of amperes, so the safety of the high-voltage system is particularly concerned by people. When the high-voltage connector of the electric automobile is disconnected or in poor contact, high-voltage line leakage is easily caused, and other parts in the automobile are damaged, so that the requirement on the connection reliability of the high-voltage wire harness and the connector in the electric automobile is high. Existing high-voltage interlock circuits are often connected to a high-voltage interlock circuit via a vehicle control unit, and the high-voltage interlock circuit is provided with a plurality of connectors in series, including a connector related to a motor and a connector related to a battery. Adopt this kind of circuit structure, can't confirm when detecting that interlocking state is unusual which connector appears unusually, can not in time distinguish battery interlocking trouble or motor interlocking trouble, be not convenient for vehicle control unit and take different measures according to concrete fault class, also be not convenient for the detection and the maintenance in later stage simultaneously.
An invention patent application with application publication number CN108045232A, application publication No. 2018, 5-month-18-day discloses a battery management system with a charging high-voltage interlock function. The system monitors a high-voltage loop of the pure electric vehicle in real time through the high-voltage power interlocking module, and provides various feedback information by using a human-computer interaction interface, so that the effective control of the high-voltage loop in the starting and stopping process of the battery pack and the timely alarm of the fault of the high-voltage loop are realized. High-voltage faults are detected through a high-voltage loop, fault processing is carried out in a single high-voltage cutting mode, and high-voltage safety and driving functions cannot be considered at the same time.
Application publication No. CN110356236A, application publication No. 2019, 10 month and 22 day of the invention patent application disclose a pure electric vehicle high-voltage interlocking system and a pure electric vehicle applying the high-voltage interlocking system. The system takes a VCU as a core component, is responsible for collecting and processing high-voltage interlocking state signals of all high-voltage interlocking loops, and adopts different safety processing strategies according to the running state of a vehicle and the high-voltage interlocking state, particularly different high-voltage components with interlocking disconnection. The high-voltage interlocking signals of the whole system are only acquired through the VCU, the requirements on the VCU are high, the high-voltage interlocking faults are only divided into two grades, only a high-voltage cutoff or power limiting processing method is adopted from the aspect of the whole vehicle, the driving experience of drivers is not facilitated, and troubleshooting of the faults is not facilitated.
Disclosure of Invention
The invention aims to provide a high-voltage interlocking control system and a high-voltage interlocking control method for a pure electric vehicle, which change the existing mode of acquiring high-voltage interlocking signals of the whole system only through a VCU into a plurality of high-voltage interlocking loops, can improve the driving experience of drivers, reduce the calculation redundancy of the VCU, and are beneficial to troubleshooting and overhauling of faults.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-voltage interlocking control system for a pure electric vehicle comprises
The VCU high-voltage interlocking loop 1 comprises a DC/DC converter, high-voltage input and output line connectors of the DC/AC converter, and input connectors of a steering oil pump motor and an air compressor;
the VCU high-voltage interlocking loop 2 comprises a high-voltage power distribution box output to an air conditioner compressor and a PTC high-voltage connector, an air conditioner compressor input connector and a PTC input connector;
the VCU high-voltage interlocking loop 3 comprises a high-voltage box and a battery pack opening detection;
and the vehicle VCU is used for recording fault information when the VCU high-voltage interlocking circuit 1, the VCU high-voltage interlocking circuit 2 or the VCU high-voltage interlocking circuit 3 is detected to be in interlocking disconnection, and sending the fault information to the vehicle-mounted human-computer interaction interface through the CAN bus.
The system also comprises an MCU high-voltage interlocking loop; the MCU high-voltage interlocking loop comprises a high-voltage connector, an MCU high-voltage input and output connector and a motor three-phase line input connector, wherein the high-voltage connector is output to the MCU by the high-voltage distribution box;
and the vehicle MCU is used for recording fault information when the MCU high-voltage interlocking loop is detected to be disconnected in an interlocking manner and sending the fault information to the vehicle-mounted human-computer interaction interface through the CAN bus.
The system comprises a battery pack, a BMS high-voltage interlocking loop 1, a high-voltage box main power supply input high-voltage connector and a battery system MSD switch, wherein the BMS high-voltage interlocking loop 1 comprises a high-voltage connecting wire connector among battery packs, a high-voltage box main power supply input high-voltage connector and a battery system MSD switch;
the BMS high-voltage interlocking circuit 2 comprises a battery system quick-charging high-voltage input connector, a slow-charging alternating current input connector, a slow-charging high-voltage output connector and a battery system slow-charging high-voltage input connector;
a BMS high voltage interlock loop 3, the BMS high voltage interlock loop 3 including a battery system heating device input and output connector and a battery system cooling device input and output connector;
and the vehicle BMS is used for recording fault information when detecting that the BMS high-voltage interlocking loop 1, the BMS high-voltage interlocking loop 2 or the BMS high-voltage interlocking loop 3 are disconnected in an interlocking manner, and sending the fault information to the vehicle-mounted human-computer interaction interface through the CAN bus.
A high-voltage interlocking control method of a pure electric vehicle,
when a vehicle VCU detects that the high-voltage interlocking loop 1 of the VCU is in interlocking disconnection, fault information is recorded, the fault is graded, the fault information is sent to a vehicle-mounted man-machine interaction interface through a CAN bus, and the vehicle-mounted man-machine interaction interface reminds a driver of the vehicle fault information and the operation to be executed; meanwhile, the VCU selects a control method according to the current vehicle state: when the vehicle is in the running process and the vehicle speed is greater than a set threshold value, the VCU firstly controls the MCU to carry out zero power output, and a vehicle power system is cut off when the vehicle speed is reduced to the set threshold value; when the vehicle is in a static state or the speed of the vehicle is less than a set threshold value, directly cutting off a vehicle power system;
when the VCU of the vehicle detects that the high-voltage interlocking loop 2 of the VCU is in interlocking disconnection, fault information is recorded, the fault is graded, the fault information is sent to a vehicle-mounted man-machine interaction interface through a CAN bus, and the vehicle-mounted man-machine interaction interface reminds a driver that the air conditioning system has a fault and cannot be used; meanwhile, the VCU sends information to the air-conditioning controller through the CAN bus, the vehicle air-conditioning system is cut off, and the vehicle air-conditioning system continues to work after the fault is relieved;
when the VCU of the vehicle detects that the high-voltage interlocking loop 3 of the VCU is in interlocking disconnection, fault information is recorded, the fault is graded, the fault information is sent to a vehicle-mounted man-machine interaction interface through a CAN bus, and the vehicle-mounted man-machine interaction interface reminds a driver of the vehicle fault information and the operation to be executed; meanwhile, the VCU selects a control method according to the current vehicle state, when the vehicle is in the driving process and the vehicle speed is greater than a set threshold value, the VCU firstly controls the MCU to carry out zero power output, and when the vehicle speed is reduced to the set threshold value, a vehicle power system is cut off; when the vehicle is in a static state or the vehicle speed is less than a set threshold value, the power system of the vehicle is directly cut off.
The vehicle MCU records fault information when detecting that the MCU high-voltage interlocking loop is disconnected in an interlocking manner, grades the fault, and sends the fault information to the VCU and the vehicle-mounted human-computer interaction interface through the CAN bus, and the vehicle-mounted human-computer interaction interface reminds a driver of the vehicle fault information and the operation to be executed; meanwhile, the VCU selects a control method according to the current vehicle state, when the vehicle is in the driving process and the vehicle speed is greater than a set threshold value, the VCU firstly controls the MCU to carry out zero power output, and when the vehicle speed is reduced to the set threshold value, a vehicle power system is cut off; when the vehicle is in a static state or the vehicle speed is less than a set threshold value, the power system of the vehicle is directly cut off.
When the BMS detects that the BMS high-voltage interlocking loop 1 is disconnected in an interlocking manner, fault information is recorded, the fault is graded, the fault information is sent to the VCU and a vehicle-mounted human-computer interaction interface through a CAN bus, and the vehicle-mounted human-computer interaction interface reminds a driver of the vehicle fault information and operation to be executed; meanwhile, the VCU selects a control method according to the current vehicle state, when the vehicle is in the driving process and the vehicle speed is greater than a set threshold value, the VCU firstly controls the MCU to carry out zero power output, and when the vehicle speed is reduced to the set threshold value, a vehicle power system is cut off; when the vehicle is in a static state or the speed of the vehicle is less than a set threshold value, directly cutting off a vehicle power system;
when the BMS detects that the BMS high-voltage interlocking loop 2 is disconnected in an interlocking manner, fault information is recorded, the fault information is graded and sent to the VCU and the vehicle-mounted human-computer interaction interface through the CAN bus, and the vehicle-mounted human-computer interaction interface reminds a driver that the charging system has faults, cannot be charged and needs to be overhauled in time;
when the BMS detects that the BMS high-voltage interlocking loop 3 is disconnected in an interlocking manner, fault information is recorded, the fault is graded, the fault information is sent to the VCU and a vehicle-mounted human-computer interaction interface through a CAN bus, and the vehicle-mounted human-computer interaction interface reminds a driver of the existence of a fault in a battery thermal management system; the vehicle BMS prompts a driver whether charging can be carried out currently or not according to the current temperature of the battery and the temperature of the battery during charging; in the charging process, if the temperature of the battery is too low, the heating device is not started, meanwhile, a fault is sent out, and if the temperature of the battery reaches the chargeable temperature, the battery system can be charged normally.
The invention has the beneficial effects that:
according to the invention, the high-voltage interlocking fault is divided into a plurality of high-voltage interlocking loops according to the actual influence on the whole vehicle running process, and the vehicle electric control system adopts different safety processing strategies according to the running state and the high-voltage interlocking state of the vehicle, especially aiming at different high-voltage components when the interlocking disconnection occurs, so that the improvement of user experience is facilitated, and the service life of the electronic equipment of the pure electric vehicle is prolonged; furthermore, all high-voltage interlocking faults are reported to the instrument, and a maintenance worker can judge a specific fault shunt according to different shunt high-voltage interlocking fault information displayed by the instrument, so that the fault reason can be conveniently searched; meanwhile, the invention adopts a plurality of control modules (VCU, BMS and MCU) to monitor the high-voltage interlocking fault, thus reducing the workload of a single control module, improving the redundancy of the fault monitoring of the whole vehicle and further improving the safety performance of the whole vehicle.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1: the invention relates to a high-voltage interlocking control system of a pure electric vehicle, which comprises
The VCU high-voltage interlocking loop 1 comprises a DC/DC converter, high-voltage input and output line connectors of the DC/AC converter, and input connectors of a steering oil pump motor and an air compressor;
the VCU high-voltage interlocking loop 2 comprises a high-voltage power distribution box output to an air conditioner compressor and a PTC high-voltage connector, an air conditioner compressor input connector and a PTC input connector;
the VCU high-voltage interlocking loop 3 comprises a high-voltage box and a battery pack opening detection;
and the vehicle VCU is used for recording fault information when the VCU high-voltage interlocking circuit 1, the VCU high-voltage interlocking circuit 2 or the VCU high-voltage interlocking circuit 3 is detected to be in interlocking disconnection, and sending the fault information to an instrument or other vehicle-mounted man-machine interaction interfaces through the CAN bus.
Preferably, the pure electric vehicle high-voltage interlocking control system further comprises an MCU high-voltage interlocking loop; the MCU high-voltage interlocking loop comprises a high-voltage connector, an MCU high-voltage input and output connector and a motor three-phase line input connector, wherein the high-voltage connector is output to the MCU by the high-voltage distribution box;
and the vehicle MCU is used for recording fault information when the MCU high-voltage interlocking loop is detected to be disconnected in an interlocking manner and sending the fault information to an instrument or other vehicle-mounted human-computer interaction interfaces through the CAN bus.
Preferably, the pure electric vehicle high-voltage interlocking control system further comprises a BMS high-voltage interlocking loop 1, wherein the BMS high-voltage interlocking loop 1 comprises a high-voltage connecting wire connector among battery packs, a high-voltage box main power supply input high-voltage connector and a battery system MSD switch;
the BMS high-voltage interlocking circuit 2 comprises a battery system quick-charging high-voltage input connector, a slow-charging alternating current input connector, a slow-charging high-voltage output connector and a battery system slow-charging high-voltage input connector;
a BMS high voltage interlock loop 3, the BMS high voltage interlock loop 3 including a battery system heating device input and output connector and a battery system cooling device input and output connector;
and the vehicle BMS is used for recording fault information when detecting that the BMS high-voltage interlocking loop 1, the BMS high-voltage interlocking loop 2 or the BMS high-voltage interlocking loop 3 are in interlocking disconnection, and sending the fault information to an instrument or other vehicle-mounted human-computer interaction interfaces through a CAN bus.
The high-voltage interlocking control method for the pure electric vehicle by utilizing the high-voltage interlocking control system for the pure electric vehicle comprises the following steps
When a vehicle VCU detects that the high-voltage interlocking loop 1 of the VCU is in interlocking disconnection, fault information is recorded, the fault is graded, the fault information is sent to an instrument or other vehicle-mounted human-computer interaction interfaces through a CAN bus, and the instrument or other vehicle-mounted human-computer interaction interfaces remind a driver of the vehicle fault information and the operation to be executed; meanwhile, the VCU selects a control method according to the current vehicle state: when the vehicle is in the running process and the vehicle speed is greater than a set threshold value, the VCU firstly controls the MCU to carry out zero power output, and a vehicle power system is cut off when the vehicle speed is reduced to the set threshold value; when the vehicle is in a static state or the speed of the vehicle is less than a set threshold value, directly cutting off a vehicle power system;
when the VCU of the vehicle detects that the high-voltage interlocking loop 2 of the VCU is in interlocking disconnection, fault information is recorded, the fault information is graded and sent to an instrument or other vehicle-mounted human-computer interaction interfaces through a CAN bus, and the instrument or other vehicle-mounted human-computer interaction interfaces remind a driver that the air conditioning system has a fault and cannot be used; meanwhile, the VCU sends information to an air conditioner controller or other controllers for controlling the work of the air conditioner through the CAN bus, the vehicle air conditioning system is cut off, and the vehicle air conditioning system continues to work after the fault is relieved;
when the VCU of the vehicle detects that the high-voltage interlocking loop 3 of the VCU is in interlocking disconnection, fault information is recorded, the fault is graded, the fault information is sent to an instrument or other vehicle-mounted human-computer interaction interfaces through a CAN bus, and the instrument or other vehicle-mounted human-computer interaction interfaces remind a driver of the fault information of the vehicle and the operation to be executed; meanwhile, the VCU selects a control method according to the current vehicle state, when the vehicle is in the driving process and the vehicle speed is greater than a set threshold value, the VCU firstly controls the MCU to carry out zero power output, and when the vehicle speed is reduced to the set threshold value, a vehicle power system is cut off; when the vehicle is in a static state or the vehicle speed is less than a set threshold value, the power system of the vehicle is directly cut off.
Preferably, the vehicle MCU records fault information when detecting that the MCU high-voltage interlocking loop is disconnected in an interlocking manner, ranks the fault, and sends the fault information to the VCU and the instrument or other vehicle-mounted human-computer interaction interfaces through the CAN bus, and the instrument or other vehicle-mounted human-computer interaction interfaces remind a driver of the vehicle fault information and the operation to be executed; meanwhile, the VCU selects a control method according to the current vehicle state, when the vehicle is in the driving process and the vehicle speed is greater than a set threshold value, the VCU firstly controls the MCU to carry out zero power output, and when the vehicle speed is reduced to the set threshold value, a vehicle power system is cut off; when the vehicle is in a static state or the vehicle speed is less than a set threshold value, the power system of the vehicle is directly cut off.
Preferably, the vehicle BMS records fault information when detecting that the BMS high-voltage interlocking loop 1 is in interlocking disconnection, ranks the fault, sends the fault information to the VCU and the instrument or other vehicle-mounted human-computer interaction interfaces through the CAN bus, and reminds a driver of the vehicle fault information and the operation to be executed by the instrument or other vehicle-mounted human-computer interaction interfaces; meanwhile, the VCU selects a control method according to the current vehicle state, when the vehicle is in the driving process and the vehicle speed is greater than a set threshold value, the VCU firstly controls the MCU to carry out zero power output, and when the vehicle speed is reduced to the set threshold value, a vehicle power system is cut off; when the vehicle is in a static state or the speed of the vehicle is less than a set threshold value, directly cutting off a vehicle power system;
vehicle BMS detects BMS high voltage interlock return circuit 2 and takes place the interlocking when breaking down and takes notes fault information, with the fault classification to send fault information to VCU and instrument or other on-vehicle human-computer interaction interface through the CAN bus, remind driver charging system to have the trouble by instrument or other on-vehicle human-computer interaction interface, in the vehicle driving process, CAN normally travel, but the instrument CAN remind driver charging system to have the trouble, CAN not charge, need in time to overhaul.
When the BMS detects that the BMS high-voltage interlocking loop 3 is disconnected in an interlocking manner, fault information is recorded, the fault is graded, the fault information is sent to the VCU and a vehicle-mounted human-computer interaction interface through a CAN bus, and the vehicle-mounted human-computer interaction interface reminds a driver of the existence of a fault in a battery thermal management system; the vehicle BMS prompts a driver whether charging can be carried out currently or not according to the current temperature of the battery and the temperature of the battery during charging; in the charging process, if the temperature of the battery is too low, the heating device is not started, meanwhile, a fault is sent out, and if the temperature of the battery reaches the chargeable temperature, the battery system can be charged normally.
In the process, if two or more high-voltage interlocking faults occur simultaneously, the VCU preferentially executes corresponding measures with high fault levels according to the fault levels, but all fault information is displayed on the instrument in a circulating mode so that a driver can clearly know the real-time state of a driven vehicle.
In order to facilitate the technical solutions of the present invention to be further understood by those skilled in the art, the technical solutions of the present invention will be further described in the following specific embodiments:
the utility model provides a pure electric vehicles high pressure interlocking system, includes that a plurality of high pressure interlocking return circuits of mutual independence are used for detecting the high pressure interlocking disconnection trouble in different return circuits respectively independently, are convenient for high pressure trouble reason and judge and fix a position. The high-voltage interlocking loop checks the electrical connection integrity and continuity of all the shunts connected with the high-voltage bus on the electric automobile, including the whole battery system, a lead, a connector, a DCDC, a motor controller, a high-voltage junction box, a protective cover and other system loops by using a low-voltage signal, and takes different treatment measures according to different shunt faults.
The connectors are connected correspondingly to form a high-voltage interlocking schematic diagram shown in figure 1.
The VCU high-voltage interlocking circuit 1 comprises high-voltage box output connectors S16, S17 and S18, a DC/DC input connector S25, a DC/AC1 input connector S24, a DC/AC1 output connector S26, a DC/AC2 input connector S23, a DC/AC2 output connector S27, a power-assisted steering motor input connector S28 and an air compressor input connector S29; by functional definition, these connectors are divided into three systems, namely a low-voltage power supply system, a steering power assisting system and a braking power assisting system, and the three systems can image the safety performance of the vehicle if a fault occurs.
The VCU high-voltage interlocking loop 2 comprises high-voltage box output connectors S19 and S20, a compressor input connector S22 and a PTC input connector S21; according to the functional definition, the connectors belong to an air conditioning system, and only influence the driving comfort and do not influence the driving safety.
The VCU high-voltage interlocking loop 3 comprises a high-voltage box cover opening detection connector S39, battery pack cover opening detection connectors S40, S41 and the like, and different numbers of connectors can be provided according to the number of battery packs; by functional definition, these connector cover opening detection systems may affect overall vehicle safety performance.
The MCU high-voltage interlocking loop comprises a high-voltage box output connector S35, a motor controller input connector S36, a motor controller output connector S37 and a driving motor input connector S38; by functional definition, these connectors belong to the electric drive system and are capable of imaging the safety performance of the vehicle in the event of a failure.
BMS high-voltage interlock loop 1, including high-voltage box input connectors S1, S9, 1# battery pack positive and negative connectors S2, S3, 2# battery pack positive and negative connectors S4, S5, (there may be different numbers of connectors according to the number of battery packs) MSD switch S6; by functional definition, these connectors belong to power battery systems and are capable of imaging the safety performance of the vehicle in the event of a failure.
The BMS high-voltage interlocking loop 2 comprises high-voltage box input connectors S30 and S34, a vehicle-mounted charger input connector S31 and a vehicle-mounted charger output connector S32; according to the functional definition, the connectors belong to a charging system, only the charging of the vehicle is influenced, and the driving safety is not influenced.
A BMS high voltage interlock loop 3 including a high voltage box connector S10, a # 1 battery pack heating input connector S11, a # 1 battery pack heating output connector S12, a # 2 battery pack heating input connector S13, and a # 2 battery pack heating output connector S14, and there may be different numbers of connectors according to the number of battery packs; by functional definition, these connectors belong to the battery heating system and may affect the safety performance of the whole vehicle.
Vehicle VCU, i.e. vehicle control unit; the system is a core control component of the whole automobile, collects signals of an accelerator pedal, a brake pedal and other components, controls the action of each component controller at the lower layer after making corresponding judgment, drives a whole automobile controller to manage, schedule, analyze and operate network information through a CAN bus by collecting driving signals of a driver and the state of the automobile, performs corresponding energy management aiming at different configurations of the automobile type, and realizes the functions of whole automobile driving control, energy optimization control, brake feedback control, network management and the like; the vehicle VCU CAN receive or detect the high-voltage disconnection of each high-voltage interlocking loop in a CAN communication mode, and adopt different safety measures according to the difference of the high-voltage interlocking loops with high-voltage disconnection to take high-voltage safety and running functions into account, so that the user experience is improved, and meanwhile, maintenance personnel CAN conveniently check fault reasons; in this embodiment, the security measures adopted by the vehicle VCU are as follows:
when the VCU of the vehicle detects that the high-voltage interlocking loop 1 of the VCU is in interlocking disconnection, fault information is recorded, the fault information is graded, the fault information is sent to an instrument or other vehicle-mounted human-computer interaction interfaces through a CAN bus, and the instrument or other vehicle-mounted human-computer interaction interfaces remind a driver of the fault information of the vehicle (such as the three-level fault of the whole vehicle) and the operation to be executed (such as the operation of stopping the vehicle while being required). Meanwhile, the VCU selects a control method according to the current vehicle state, when the vehicle is in the driving process, the VCU firstly controls an MCU (motor controller) to carry out zero power output, and when the vehicle speed is reduced to a set threshold value (for example: 5 km/h), a vehicle power system is cut off; when the vehicle is in a static state or the vehicle speed is less than a set threshold value, the power system of the vehicle is directly cut off.
When the vehicle VCU detects that the high-voltage interlocking loop 2 of the VCU is in interlocking disconnection, fault information is recorded, the fault information is graded and sent to an instrument or other vehicle-mounted man-machine interaction interfaces through a CAN bus, and the instrument or other vehicle-mounted man-machine interaction interfaces remind a driver of the existence of the fault (for example, the fault of the air conditioning system, the failure of the air conditioning system) of the air conditioning system. Meanwhile, the VCU CAN send information to an air conditioner controller or other controllers for controlling the air conditioner to work through a CAN bus or other modes, the air conditioner system stops working, and the VCU CAN continue to work after the fault is relieved.
When the vehicle VCU detects that the high-voltage interlocking loop 3 of the VCU is in interlocking disconnection, fault information is recorded, the fault information is graded, the fault information is sent to an instrument or other vehicle-mounted man-machine interaction interfaces through a CAN bus, and the instrument or other vehicle-mounted man-machine interaction interfaces remind a driver of the vehicle fault information (for example, the high-voltage system is uncovered to detect the fault) and the operation needing to be executed (for example, please stop the vehicle by the side to check whether the upper cover of the high-voltage system is opened or not). Meanwhile, the VCU selects a control method according to the current vehicle state, when the vehicle is in the driving process, the VCU firstly controls an MCU (motor controller) to carry out zero power output, and when the vehicle speed is reduced to a set threshold value (for example: 5 km/h), a vehicle power system is cut off; when the vehicle is in a static state or the vehicle speed is less than a set threshold value, the power system of the vehicle is directly cut off.
When the vehicle MCU detects that the MCU high-voltage interlocking loop 1 is in interlocking disconnection, fault information is recorded, the fault is graded, the fault information is sent to the VCU and an instrument or other vehicle-mounted human-computer interaction interfaces through the CAN bus, and the instrument or other vehicle-mounted human-computer interaction interfaces remind a driver of the vehicle fault information (such as the high-voltage interlocking fault of an electric drive system) and the operation to be executed (such as the operation of stopping by the side). Meanwhile, the VCU selects a control method according to the current vehicle state, when the vehicle is in the driving process, the VCU firstly controls an MCU (motor controller) to carry out zero power output, and when the vehicle speed is reduced to a set threshold value (for example: 5 km/h), a vehicle power system is cut off; when the vehicle is in a static state or the vehicle speed is less than a set threshold value, the power system of the vehicle is directly cut off.
When the BMS detects that the BMS high-voltage interlocking loop 1 is disconnected in an interlocking manner, fault information is recorded, the fault information is graded and sent to the VCU and a meter or other vehicle-mounted man-machine interaction interfaces through the CAN bus, and the meter or other vehicle-mounted man-machine interaction interfaces remind a driver of the vehicle fault information (such as the high-voltage interlocking fault of a battery system) and the operation needing to be executed (such as the fact that the driver needs to stop at the side). Meanwhile, the VCU selects a control method according to the current vehicle state, when the vehicle is in the driving process, the VCU firstly controls an MCU (motor controller) to carry out zero power output, and when the vehicle speed is reduced to a set threshold value (for example: 5 km/h), a vehicle power system is cut off; when the vehicle is in a static state or the vehicle speed is less than a set threshold value, the power system of the vehicle is directly cut off.
When the BMS detects that the BMS high-voltage interlocking loop 2 is disconnected in an interlocking mode, fault information is recorded, the fault information is graded, the fault information is sent to the VCU and the instrument or other vehicle-mounted human-computer interaction interfaces through the CAN bus, and the instrument or other vehicle-mounted human-computer interaction interfaces remind a driver of the existence of the fault of the charging system (for example, the charging system is failed in the high-voltage interlocking mode, and the driver needs to maintain timely). In the vehicle driving process, the vehicle can normally drive, but the instrument can remind a driver that a charging system has faults and cannot be charged, and normal charging can be carried out after the faults are eliminated.
When the BMS detects that the BMS high-voltage interlocking loop 3 is disconnected in an interlocking mode, fault information is recorded, the fault information is graded and sent to the VCU and the instrument or other vehicle-mounted man-machine interaction interfaces through the CAN bus, and the instrument or other vehicle-mounted man-machine interaction interfaces remind a driver of the existence of the fault of the battery thermal management system (for example, the high-voltage interlocking fault of the battery heating system, and the driver needs to maintain in time). During the running process of the vehicle, the vehicle can run normally, but the instrument can remind a driver of the fault of the battery thermal management system, and the BMS prompts the driver whether charging can be carried out currently or not according to the current temperature of the battery and the temperature of the battery during charging (for example, over 0 ℃). During charging, if the temperature of the battery is too low (for example, below 0 ℃), the heating device is not started, and meanwhile, the fault is sent out, and if the temperature of the battery reaches the chargeable temperature, the battery system is normally charged.
If two or more high-voltage interlocking faults occur simultaneously, the VCU preferentially executes corresponding measures with high fault levels according to the fault levels of the VCU, but all fault information is displayed on the meter in a circulating mode so that a driver can clearly know the real-time state of a driven vehicle.
The invention has the following beneficial effects:
according to the invention, the high-voltage interlocking fault is divided into a plurality of high-voltage interlocking loops according to the actual influence on the whole vehicle running process, and the vehicle electric control system adopts different safety processing strategies according to the running state and the high-voltage interlocking state of the vehicle, especially aiming at different high-voltage components when the interlocking disconnection occurs, so that the improvement of user experience is facilitated, and the service life of the electronic equipment of the pure electric vehicle is prolonged; furthermore, all high-voltage interlocking faults are reported to the instrument, and a maintenance worker can judge a specific fault shunt according to different shunt high-voltage interlocking fault information displayed by the instrument, so that the fault reason can be conveniently searched; meanwhile, the invention adopts a plurality of control modules (VCU, BMS and MCU) to monitor the high-voltage interlocking fault, thus reducing the workload of a single control module, improving the redundancy of the fault monitoring of the whole vehicle and further improving the safety performance of the whole vehicle.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. The utility model provides a pure electric vehicles high pressure interlocking control system which characterized in that: comprises that
The VCU high-voltage interlocking loop 1 comprises a DC/DC converter, high-voltage input and output line connectors of the DC/AC converter, and input connectors of a steering oil pump motor and an air compressor;
the VCU high-voltage interlocking loop 2 comprises a high-voltage power distribution box output to an air conditioner compressor and a PTC high-voltage connector, an air conditioner compressor input connector and a PTC input connector;
the VCU high-voltage interlocking loop 3 comprises a high-voltage box and a battery pack opening detection;
and the vehicle VCU is used for recording fault information when the VCU high-voltage interlocking circuit 1, the VCU high-voltage interlocking circuit 2 or the VCU high-voltage interlocking circuit 3 is detected to be in interlocking disconnection, and sending the fault information to the vehicle-mounted human-computer interaction interface through the CAN bus.
2. The pure electric vehicle high-voltage interlocking control system according to claim 1, characterized in that: the system also comprises an MCU high-voltage interlocking loop; the MCU high-voltage interlocking loop comprises a high-voltage connector, an MCU high-voltage input and output connector and a motor three-phase line input connector, wherein the high-voltage connector is output to the MCU by the high-voltage distribution box;
and the vehicle MCU is used for recording fault information when the MCU high-voltage interlocking loop is detected to be disconnected in an interlocking manner and sending the fault information to the vehicle-mounted human-computer interaction interface through the CAN bus.
3. The pure electric vehicle high-voltage interlocking control system according to claim 2, characterized in that: the system comprises a battery pack, a BMS high-voltage interlocking loop 1, a high-voltage box main power supply input high-voltage connector and a battery system MSD switch, wherein the BMS high-voltage interlocking loop 1 comprises a high-voltage connecting wire connector among battery packs, a high-voltage box main power supply input high-voltage connector and a battery system MSD switch;
the BMS high-voltage interlocking circuit 2 comprises a battery system quick-charging high-voltage input connector, a slow-charging alternating current input connector, a slow-charging high-voltage output connector and a battery system slow-charging high-voltage input connector;
a BMS high voltage interlock loop 3, the BMS high voltage interlock loop 3 including a battery system heating device input and output connector and a battery system cooling device input and output connector;
and the vehicle BMS is used for recording fault information when detecting that the BMS high-voltage interlocking loop 1, the BMS high-voltage interlocking loop 2 or the BMS high-voltage interlocking loop 3 are disconnected in an interlocking manner, and sending the fault information to the vehicle-mounted human-computer interaction interface through the CAN bus.
4. A pure electric vehicle high-voltage interlocking control method implemented by using the pure electric vehicle high-voltage interlocking control system of claim 3 is characterized in that:
when a vehicle VCU detects that the high-voltage interlocking loop 1 of the VCU is in interlocking disconnection, fault information is recorded, the fault is graded, the fault information is sent to a vehicle-mounted man-machine interaction interface through a CAN bus, and the vehicle-mounted man-machine interaction interface reminds a driver of the vehicle fault information and the operation to be executed; meanwhile, the VCU selects a control method according to the current vehicle state: when the vehicle is in the running process and the vehicle speed is greater than a set threshold value, the VCU firstly controls the MCU to carry out zero power output, and a vehicle power system is cut off when the vehicle speed is reduced to the set threshold value; when the vehicle is in a static state or the speed of the vehicle is less than a set threshold value, directly cutting off a vehicle power system;
when the VCU of the vehicle detects that the high-voltage interlocking loop 2 of the VCU is in interlocking disconnection, fault information is recorded, the fault is graded, the fault information is sent to a vehicle-mounted man-machine interaction interface through a CAN bus, and the vehicle-mounted man-machine interaction interface reminds a driver that the air conditioning system has a fault and cannot be used; meanwhile, the VCU sends information to the air-conditioning controller through the CAN bus, the vehicle air-conditioning system is cut off, and the vehicle air-conditioning system continues to work after the fault is relieved;
when the VCU of the vehicle detects that the high-voltage interlocking loop 3 of the VCU is in interlocking disconnection, fault information is recorded, the fault is graded, the fault information is sent to a vehicle-mounted man-machine interaction interface through a CAN bus, and the vehicle-mounted man-machine interaction interface reminds a driver of the vehicle fault information and the operation to be executed; meanwhile, the VCU selects a control method according to the current vehicle state, when the vehicle is in the driving process and the vehicle speed is greater than a set threshold value, the VCU firstly controls the MCU to carry out zero power output, and when the vehicle speed is reduced to the set threshold value, a vehicle power system is cut off; when the vehicle is in a static state or the vehicle speed is less than a set threshold value, the power system of the vehicle is directly cut off.
5. The pure electric vehicle high-voltage interlocking control method according to claim 4, characterized in that:
the vehicle MCU records fault information when detecting that the MCU high-voltage interlocking loop is disconnected in an interlocking manner, grades the fault, and sends the fault information to the VCU and the vehicle-mounted human-computer interaction interface through the CAN bus, and the vehicle-mounted human-computer interaction interface reminds a driver of the vehicle fault information and the operation to be executed; meanwhile, the VCU selects a control method according to the current vehicle state, when the vehicle is in the driving process and the vehicle speed is greater than a set threshold value, the VCU firstly controls the MCU to carry out zero power output, and when the vehicle speed is reduced to the set threshold value, a vehicle power system is cut off; when the vehicle is in a static state or the vehicle speed is less than a set threshold value, the power system of the vehicle is directly cut off.
6. The pure electric vehicle high-voltage interlocking control method according to claim 5, characterized in that:
when the BMS detects that the BMS high-voltage interlocking loop 1 is disconnected in an interlocking manner, fault information is recorded, the fault is graded, the fault information is sent to the VCU and a vehicle-mounted human-computer interaction interface through a CAN bus, and the vehicle-mounted human-computer interaction interface reminds a driver of the vehicle fault information and operation to be executed; meanwhile, the VCU selects a control method according to the current vehicle state, when the vehicle is in the driving process and the vehicle speed is greater than a set threshold value, the VCU firstly controls the MCU to carry out zero power output, and when the vehicle speed is reduced to the set threshold value, a vehicle power system is cut off; when the vehicle is in a static state or the speed of the vehicle is less than a set threshold value, directly cutting off a vehicle power system;
when the BMS detects that the BMS high-voltage interlocking loop 2 is disconnected in an interlocking manner, fault information is recorded, the fault information is graded and sent to the VCU and the vehicle-mounted human-computer interaction interface through the CAN bus, and the vehicle-mounted human-computer interaction interface reminds a driver that the charging system has faults, cannot be charged and needs to be overhauled in time;
when the BMS detects that the BMS high-voltage interlocking loop 3 is disconnected in an interlocking manner, fault information is recorded, the fault is graded, the fault information is sent to the VCU and a vehicle-mounted human-computer interaction interface through a CAN bus, and the vehicle-mounted human-computer interaction interface reminds a driver of the existence of a fault in a battery thermal management system; the vehicle BMS prompts a driver whether charging can be carried out currently or not according to the current temperature of the battery and the temperature of the battery during charging; in the charging process, if the temperature of the battery is too low, the heating device is not started, meanwhile, a fault is sent out, and if the temperature of the battery reaches the chargeable temperature, the battery system can be charged normally.
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| CN202011170303.XA CN112319227A (en) | 2020-10-28 | 2020-10-28 | High-voltage interlocking control system and method for pure electric vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113352893A (en) * | 2021-03-09 | 2021-09-07 | 奇瑞商用车（安徽）有限公司 | High-voltage interlocking troubleshooting system for electric automobile |
| CN113650499A (en) * | 2021-07-28 | 2021-11-16 | 岚图汽车科技有限公司 | High-voltage interlocking fault detection and processing method and system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113352893A (en) * | 2021-03-09 | 2021-09-07 | 奇瑞商用车（安徽）有限公司 | High-voltage interlocking troubleshooting system for electric automobile |
| CN113352893B (en) * | 2021-03-09 | 2022-05-03 | 奇瑞商用车（安徽）有限公司 | High-voltage interlocking troubleshooting system for electric automobile |
| CN113650499A (en) * | 2021-07-28 | 2021-11-16 | 岚图汽车科技有限公司 | High-voltage interlocking fault detection and processing method and system |
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