CN114789674A

CN114789674A - Charging control method for whole electric vehicle controller and whole electric vehicle controller

Info

Publication number: CN114789674A
Application number: CN202110023833.XA
Authority: CN
Inventors: 刘宝泉; 林鸿志; 李国正
Original assignee: Vimar Automotive Wenzhou Co ltd; WM Smart Mobility Shanghai Co Ltd
Current assignee: Vimar Automotive Wenzhou Co ltd; WM Smart Mobility Shanghai Co Ltd
Priority date: 2021-01-08
Filing date: 2021-01-08
Publication date: 2022-07-26

Abstract

The invention discloses a charging control method of a whole vehicle controller of an electric vehicle and the whole vehicle controller, wherein the method comprises the following steps: receiving a to-be-charged state message sent by a vehicle-mounted charger, wherein the vehicle-mounted charger is directly connected with a power battery system of the electric automobile; the motor is forbidden to operate, and the vehicle is controlled to park; when the parking of the vehicle is completed, a self-checking command is sent to the high-voltage component of the vehicle; if all the high-voltage components of the vehicle are normally self-checked, acquiring charging parameters from the battery management system, sending the charging parameters to the vehicle-mounted charger, and controlling the vehicle-mounted charger to start charging the power battery system; and in response to the charging stop event, controlling the vehicle-mounted charger to stop charging the power battery system. The invention redesigns the charging system architecture of a power battery system (PACK) without an alternating current relay, takes a whole vehicle controller VCU as a 'host' and other controllers as 'slaves', and receives the control of the VCU in the charging process to realize tight communication, joint debugging and action.

Description

Charging control method for whole electric vehicle controller and whole electric vehicle controller

Technical Field

The invention relates to the related technical field of electric vehicles, in particular to a charging control method for a whole vehicle controller of an electric vehicle and the whole vehicle controller.

Background

An electric automobile adopts a battery PACK (PACK) to supply power for a driving motor. The battery pack is charged by alternating current through an On-Board Charger (OBC). An alternating current relay generally exists in a battery pack of an existing alternating current chargeable electric automobile. The on-off of the battery pack and the vehicle-mounted charger is controlled through the alternating current relay.

However, with the ac relay, there are problems as follows:

1. in the ac charging process, the ac relay is controlled by a Battery Management System (BMS), and the BMS controls the on and off of the ac relay and determines whether the ac relay is actually on or off, which is tedious and time-consuming.

2. The cost of the alternating current relay is high, and meanwhile, in order to monitor the alternating current relay, a sampling wire harness for monitoring the adhesion of the relay and related monitoring logic need to be added.

3. Ac relays are easily damaged, easily stick, and have a limited life.

And 4, periodically detecting the adhesion state of the alternating current relay by the BMS, and occupying the CPU utilization rate and the memory.

In addition, the existing alternating current charging usually uses the OBC as a control main body, and the OBC has low priority in the whole vehicle and cannot obtain all information of the whole vehicle, so that the OBC is adopted to guide the charging process, and the problems of incomplete charging link information, low safety level and the like are easily caused.

Finally, the existing electric vehicle does not pay attention to the thermal management of the battery during alternating current charging, lithium ions are easily separated out (lithium is separated out) during low-temperature charging, and the battery is easily over-temperature, spontaneous combustion and even explosion during high-temperature charging.

Disclosure of Invention

Therefore, it is necessary to provide a method for controlling charging of a vehicle control unit of an electric vehicle and an electronic device, which solve the technical problem that the electric vehicle in the prior art is prone to have an acceleration feeling when passing through a bumpy road surface.

The invention provides a charging control method for a whole vehicle controller of an electric vehicle, which comprises the following steps:

receiving a to-be-charged state message sent by a vehicle-mounted charger, wherein the vehicle-mounted charger is directly connected with a power battery system of the electric automobile;

the motor is forbidden to operate, and the vehicle is controlled to park;

when the parking of the vehicle is completed, a self-checking command is sent to the high-voltage component of the vehicle;

if all the high-voltage components of the vehicle are normally self-checked, acquiring charging parameters from a battery management system, sending the charging parameters to a vehicle-mounted charger, and controlling the vehicle-mounted charger to start charging the power battery system;

and in response to the charging stop event, controlling the vehicle-mounted charger to stop charging the power battery system.

The invention redesigns a charging system architecture of a power battery system (PACK) without an alternating current relay, takes a Vehicle Control Unit (VCU) as a host computer and other controllers as slave computers, receives the Control of the VCU in the charging process, realizes tight communication, joint debugging and action, and thereby safely, reliably and quickly finishes the charging process.

Further, when receiving that the parking of the vehicle is completed, sending a self-checking command to the high-voltage component of the vehicle specifically includes:

when the parking completion of the vehicle is received, controlling the electronic lock of the charging gun to be closed;

and sending a self-test command to the high-voltage component of the vehicle.

This embodiment increases the close control to the rifle electronic lock that charges to guarantee charging safety.

Further, the acquiring of the charging parameter from the battery management system, the sending of the charging parameter to the vehicle-mounted charger, and the controlling of the vehicle-mounted charger to start charging the power battery system specifically include:

acquiring a charging parameter and a charging temperature requirement from a battery management system;

sending the charging parameters to a vehicle-mounted charger, and controlling the vehicle-mounted charger to start charging the power battery system;

calculating the refrigeration power required by the power battery system according to the charging temperature requirement, and controlling a refrigeration module to refrigerate according to the refrigeration power; or

And calculating the heating power required by the power battery system according to the charging temperature requirement, and controlling the heating module to heat according to the heating power.

In the embodiment, a battery thermal management control method is added in the charging process, so that the battery is ensured to be in an optimum temperature range.

Further, the controlling, in response to the charging stop event, the vehicle-mounted charger to stop charging the power battery system specifically includes:

in response to the charging stop event, controlling the vehicle-mounted charger to stop charging the power battery system;

and controlling the refrigeration module or the heating module to stop working.

In the embodiment, the refrigeration module or the heating module is controlled to stop working while the charging is stopped, so that the resource waste is avoided.

Further, when the electric vehicle is in a dormant state, the method further comprises the following steps:

responding to a wake-up signal of a vehicle-mounted charger, and waking up the vehicle controller;

and waking up the battery management system.

In the embodiment, aiming at the state that the whole vehicle is not in a high voltage state, the alternating current charging is completed through orderly awakening the whole vehicle controller and the battery management system.

Further, if the self-tests of all the high-voltage components of the vehicle are normal, acquiring the charging parameters from the battery management system, sending the charging parameters to the vehicle-mounted charger, and controlling the vehicle-mounted charger to start charging the power battery system specifically includes:

if all high-voltage components of the vehicle are normally self-checked, sending a high-voltage connection command to the battery management system, and controlling the battery management system to perform high-voltage connection;

and when a high-voltage connection success signal of the battery management system is received, acquiring charging parameters from the battery management system, sending the charging parameters to the vehicle-mounted charger, and controlling the vehicle-mounted charger to start charging the power battery system.

In the embodiment, the control battery management system is added to carry out high-voltage connection, so that the charging parameters can be acquired when the whole vehicle is not in a high-voltage state.

Still further, when a high-voltage connection success signal of the battery management system is received, acquiring a charging parameter from the battery management system, sending the charging parameter to the vehicle-mounted charger, and controlling the vehicle-mounted charger to start charging the power battery system specifically includes:

when a high-voltage connection success signal of the battery management system is received, controlling power supply to the vehicle-mounted low-voltage electric appliance;

and acquiring charging parameters from the battery management system, sending the charging parameters to the vehicle-mounted charger, and controlling the vehicle-mounted charger to start charging the power battery system.

After the high-voltage connection success signal of the battery management system is received, the power supply to the vehicle-mounted low-voltage electric appliance is controlled, so that the electric quantity is provided for the battery management system, and the battery management system can normally work to obtain the charging parameters.

Still further, responding to the charging stop event, controlling the vehicle-mounted charger to stop charging the power battery system specifically comprises:

sending a high-voltage connection disconnection command to the battery management system, and controlling the battery management system to disconnect the high-voltage connection;

controlling the battery management system to sleep;

and the vehicle control unit enters the sleep mode.

In the embodiment, after charging is completed for the whole vehicle in a state of no high voltage, the whole vehicle enters the dormancy again by controlling the dormancy of the whole vehicle controller and the battery management system.

Still further, the method further comprises:

if the vehicle-mounted charger detects a fault, or the battery management system detects a fault, or other parts of the vehicle detect a fault, a charging stop event is triggered according to the fault degree, or the vehicle-mounted charger is controlled to reduce charging current and charging power, wherein the other parts of the vehicle are other parts except the vehicle-mounted charger which detects the fault, the battery management system and the whole vehicle manager.

The embodiment treats the abnormal condition in the charging process.

The invention provides a vehicle control unit of an electric vehicle, which comprises:

at least one processor; and (c) a second step of,

a memory communicatively coupled to at least one of the processors; wherein the content of the first and second substances,

the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the charging control method for the whole electric vehicle controller as described above.

The invention redesigns the charging system architecture of a power battery system (PACK) without an alternating current relay, takes a VCU of a whole vehicle controller as a 'host' and other controllers as 'slaves', receives the control of the VCU in the charging process, realizes the tight communication, joint debugging and action, and thereby safely, reliably and quickly finishes the charging process.

Drawings

Fig. 1 is a work flow chart of a charging control method of a vehicle control unit of an electric vehicle according to the present invention;

FIG. 2 is a schematic circuit diagram of an embodiment of the present invention;

FIG. 3 is a flowchart of the operation of the preferred embodiment of the present invention under the condition of high voltage on the whole vehicle;

FIG. 4 is a flowchart illustrating the operation of the preferred embodiment of the present invention when the vehicle is in a non-high voltage state;

FIG. 5 is a flow chart of exception handling in accordance with a preferred embodiment of the present invention;

FIG. 6 is a schematic diagram of a connection circuit of the power supply device, the vehicle interface and the electric vehicle

Fig. 7 is a schematic diagram of a hardware structure of a vehicle control unit of an electric vehicle according to the present invention.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples.

Fig. 1 shows a work flow chart of a charging control method for a vehicle control unit of an electric vehicle according to the present invention, which includes:

step S101, receiving a message of a state to be charged sent by a vehicle-mounted charger, wherein the vehicle-mounted charger is directly connected with a power battery system of an electric automobile;

step S102, forbidding the motor to run, and controlling the vehicle to park;

step S103, when the parking of the vehicle is completed, a self-checking command is sent to the high-voltage component of the vehicle;

step S104, if the self-checking of all the high-voltage components of the vehicle is normal, acquiring charging parameters from the battery management system, sending the charging parameters to the vehicle-mounted charger, and controlling the vehicle-mounted charger to start charging the power battery system;

and step S105, in response to the charging stop event, controlling the vehicle-mounted charger to stop charging the power battery system.

Specifically, the present embodiment is mainly applied to a Vehicle Control Unit (VCU).

Fig. 2 shows a schematic circuit diagram of an embodiment of the present invention, which includes: power battery system 1, on-vehicle machine 2 that charges, vehicle control unit 3, battery management system 4, refrigeration module 5, heating module 6, the interface 7 that charges of interchange, electronic lock 8 and other controllers 9, wherein:

the power battery system 1 includes: the system comprises a battery cell 11, a thermal management pipeline 12 for refrigerating or heating the battery cell 11, a current sensor 13, a manual maintenance switch 14, a pre-charging relay 15, a pre-charging resistor 16, a main positive relay 17, a fuse 18, an alternating current charging positive terminal 19, a discharging positive terminal 110, an auxiliary discharging positive terminal 111, a direct current charging relay 112, a direct current charging positive terminal 113, a main negative relay 114, a direct current charging negative terminal 115, an auxiliary discharging negative terminal 116, a discharging negative terminal 117 and an alternating current charging negative terminal 118;

the vehicle-mounted charger 2 is used for charging the power battery system 1;

the whole vehicle manager 3 is used for managing the whole charging process;

the battery management system 4 is used for acquiring battery related information;

the refrigeration module 5 includes: an air conditioning system (AC) for cooling the battery;

the heating module 6 includes: a Positive Temperature Coefficient (PTC) heater, a fuel heater, a heat pump, etc. for heating the battery;

an ac charging interface 7, such as a base and a charging gun, for connecting with the ac charging pile 10 to perform ac charging, where CC is a connection detection line, CP is a charging control line, L1, L2, and L3 are three-phase input lines, N is a three-phase input neutral line, and PE is a ground line;

the electronic lock 8 is used for locking the charging gun;

other controllers 9 include a Motor Control Unit (MCU), a Body Control Module (BCM), an Electronic Stability Control (ESC), an Electronic Park Brake (EPB), a direct current transformer (DCDC), and the like.

Between the vehicle-mounted charger 2 and the power battery system 1, an alternating current relay is omitted, and the vehicle-mounted charger 2 is directly connected with the power battery system 1.

Because the AC relay is cancelled, the control on the AC relay is cancelled in the whole charging process. And the vehicle control unit 4 performs management. Compared with the conventional mode of managing by adopting the battery management system 3, the vehicle control unit 4 has high priority in the vehicle and has the highest priority control right, so that the vehicle control unit can receive information of each controller and control the actions of other controllers in the charging process.

Step S101 is triggered when the user connects the charging gun to the vehicle-mounted charger. And then, step S102 is executed, the motor is forbidden to operate, and the vehicle is controlled to park, so that the vehicle is ensured not to move in the charging process. Specifically, the motor CAN be prohibited from running through a Controller Area Network (CAN) bus, and the MCU CAN be commanded to have a torque of 0 nm (N · m) and a rotation speed of 0 rpm (r/min) through CAN communication.

After the other controllers feed back the parking information, step S103 is triggered, which may specifically be: when the MCU feeds back the VCU in a stationary state, the input voltage is 0 volt (V), the ESC feeds back the vehicle speed in 0 kilometer per hour (km/h), and the EPB feeds back the parking (hand brake) state, step S103 is triggered. Step S103, sending a self-checking command to the vehicle high-voltage component, enabling the vehicle high-voltage component to perform self-checking, and judging whether a fault exists. If there is no fault and the high-voltage component self-tests normally, step S104 is executed to obtain the charging parameters from the battery management system. The charging parameters include, but are not limited to: the BMS calculates the maximum allowable alternating current charging voltage, the maximum allowable alternating current charging current and the like Of the PACK according to parameters such as the electric quantity, the temperature, the fault level and the like Of the State Of Charge (SOC). And the charging parameters are sent to the vehicle-mounted charger, and the vehicle-mounted charger determines the specific charging output power and charges the PACK.

When the charge stop event occurs, step S104 is triggered. Charge stop events include, but are not limited to: the BMS sends a charge cutoff condition, abnormal termination, manual stop to the VCU.

In one embodiment, when the vehicle parking completion is received, the sending a self-test command to the vehicle high-voltage component specifically includes:

and sending a self-test command to the high-voltage component of the vehicle.

The embodiment adds the closing control of the electronic lock of the charging gun to ensure the charging safety.

In one embodiment, the acquiring the charging parameter from the battery management system, sending the charging parameter to the vehicle-mounted charger, and controlling the vehicle-mounted charger to start charging the power battery system specifically includes:

the charging parameters are sent to a vehicle-mounted charger, and the vehicle-mounted charger is controlled to start charging the power battery system;

calculating the refrigerating power required by the power battery system according to the charging temperature requirement, and controlling a refrigerating module to refrigerate according to the refrigerating power; or alternatively

In one embodiment, the controlling, in response to the charging stop event, the vehicle-mounted charger to stop charging the power battery system specifically includes:

in response to a charging stop event, controlling the vehicle-mounted charger to stop charging the power battery system;

and controlling the refrigeration module or the heating module to stop working.

In one embodiment, when the electric vehicle is in a sleep state, the method further comprises:

responding to a wake-up signal of the vehicle-mounted charger, and waking up the vehicle control unit;

and waking up the battery management system.

In the embodiment, for the state that the whole vehicle is not in the high voltage state, the alternating current charging is completed through orderly awakening the whole vehicle controller and the battery management system.

In one embodiment, if the self-test of all the high-voltage components of the vehicle is normal, acquiring a charging parameter from the battery management system, sending the charging parameter to the vehicle-mounted charger, and controlling the vehicle-mounted charger to start charging the power battery system specifically includes:

if all the high-voltage components of the vehicle are normally self-checked, sending a high-voltage connection command to the battery management system, and controlling the battery management system to carry out high-voltage connection;

In one embodiment, when a high-voltage connection success signal of the battery management system is received, acquiring a charging parameter from the battery management system, sending the charging parameter to the vehicle-mounted charger, and controlling the vehicle-mounted charger to start charging the power battery system specifically includes:

when a high-voltage connection success signal of the battery management system is received, controlling to supply power to the vehicle-mounted low-voltage electric appliance;

and acquiring the charging parameters from the battery management system, sending the charging parameters to the vehicle-mounted charger, and controlling the vehicle-mounted charger to start charging the power battery system.

After the successful high-voltage connection signal of the battery management system is received, the power supply to the vehicle-mounted low-voltage electric appliance is controlled, so that the electric quantity is provided for the battery management system, and the battery management system can normally work to obtain the charging parameters.

controlling the battery management system to sleep;

and the vehicle control unit enters the sleep mode.

Fig. 3 shows a flow chart of the operation of the preferred embodiment of the present invention in the state of high voltage on the whole vehicle, which includes:

step S301, after the AC charging gun is inserted, the OBC judges a CC (charging connection confirmation) signal and determines that the charging gun of the charging pile is fully connected with a charging seat of the electric automobile;

identifying the rated current of a charging pile cable;

the OBC determines that CP (control guidance) signal voltage or PWM is normal, and identifies the maximum power supply current of the charging pile;

specifically, the determination may be made by determining whether a charging gun connection switch and a charging gun connection resistor are normal, as shown in fig. 6, the connection circuit is a schematic diagram of the connection circuit of the power supply equipment 31, the vehicle interface 32 and the electric vehicle 33, the connection circuit is composed of resistors R1, R2, R3, R4, RC, switches K1, K2, S1, S2, S3, and a diode D1, the vehicle interface 32 may be a charging gun, the charging gun connection switch is an S3 switch in the vehicle interface 32, the charging gun connection resistor is R4 and an RC resistor in the connection circuit, and the RC and R4 are used to determine whether the charging gun and the charging dock are in an unconnected phase, a half-connected phase, or a full-connected phase;

step S302, the OBC sends a message of the state to be charged to the VCU through the CAN network;

step S303, the VCU prohibits the motor from running, and commands the MCU to have the torque of 0 N.m and the rotating speed of 0r/min N through CAN communication;

step S304, the MCU feeds back VCU as a static state and the input voltage is 0V;

ESC feedback vehicle speed is 0 km/h;

EPB feedback is a park (handbrake) state;

step S305, the OBC requests the VCU to close the electronic lock (lock the charging gun) and detects the state of the electronic lock;

step S306, a switch S2 arranged in the OBC is closed, a switch S2 is an electric vehicle charging preparation switch, and a signal is sent to the charging pile through a CP (control guidance circuit);

step S307, each high-voltage component of the vehicle is subjected to normal self-checking, and no serious fault is fed back to the VCU;

step S308, the BMS calculates the maximum allowable AC charging voltage, the maximum allowable AC charging current and the like of the PACK according to parameters such as the SOC electric quantity, the temperature, the fault level and the like of the battery cell;

the BMS outputs the cold quantity or heat quantity requirement of the battery pack according to the actual temperature of the battery cell, the alternating current charging requirement and the like, and the cold quantity or the heat quantity requirement is sent to the VCU;

step S309, the OBC feeds back PACK voltage values detected by the positive electrode and the negative electrode of the alternating current charging;

step S310, VCU sends the maximum allowable AC charging voltage and current (i.e. maximum allowable charging power) of OBC, PACK;

the OBC feeds back the maximum output charging power per se;

the OBC compares the two values, and cancels the two values as actual output power;

step S311, the OBC starts to charge the PACK;

BMS real-time pressure and temperature collection, SOC calculation and the like;

step S312, the VCU calculates the refrigerating power/heating power required by the battery pack according to the cold quantity or heat quantity requirement of the BMS, sends the refrigerating power/heating power to the refrigerating module/heating module, meets the heating or refrigerating power of the battery pack, and is smaller than the actual output power of a vehicle-mounted charger;

step S313, if the BMS sends a charge cutoff condition to the VCU; or an abnormal termination; or stopping manually, executing step S314, otherwise, continuing to execute step S311;

step S314, the VCU sends charging completion and stop commands to the OBC, and unlocks the electronic lock;

the OBC is shut down and switch S2 is opened;

step S315, the VCU commands the refrigeration module/heating module to stop working;

and step S316, pulling out the alternating current charging gun and finishing.

Fig. 4 shows a flow chart of the operation of the preferred embodiment of the present invention when the vehicle is not in the high voltage state (e.g. after the vehicle is locked and sleeping), which includes:

step S401, after an alternating current charging gun is inserted, an OBC is awakened, hardware is initialized, and self-checking is carried out;

step S402, the OBC judges a CC (charging connection confirmation) signal and determines that a charging gun of a charging pile is fully connected with a charging seat of the electric automobile;

identifying the rated current of a charging pile cable;

step S403, the OBC awakens the VCU from the low-voltage circuit and the hard line;

the VCU awakens the BMS from the low-voltage cable and the hard wire;

step S404, the VCU prohibits the motor from running, and commands the MCU torque to be 0 N.m and the rotating speed to be 0r/min through CAN communication;

step S405, the MCU feeds back that VCU is in a static state and the input voltage is 0V;

ESC feedback vehicle speed is 0 km/h;

EPB feedback is in a parking (hand brake) state;

step S406, the OBC requests the VCU to close the electronic lock (lock the charging gun) and detects the state of the electronic lock;

step S407, a switch S2 arranged in the OBC is closed, a switch S2 is an electric vehicle charging preparation switch, and a signal is sent to the charging pile through a CP (control guidance circuit);

step S408, each high-voltage component of the vehicle is self-checked normally, and no serious fault is fed back to the VCU;

step S409, the VCU sends a BMS high-voltage connection command;

step S410, the BMS sequentially switches on the main and negative relays and the pre-charging relay, and the pre-charging process is completed;

closing the main positive relay, disconnecting the pre-charging relay, completing the high-voltage connection, and sending a high-voltage connection success signal to the VCU by the BMS;

step S411, enabling the DCDC to work by the VCU, and starting to supplement power for the storage battery and provide low-voltage power supply for the whole vehicle;

step S412, the BMS calculates the maximum allowable AC charging voltage, the maximum allowable AC charging current and the like of the PACK according to parameters such as the SOC electric quantity, the temperature, the fault level and the like of the battery cell;

step S413, the OBC feeds back PACK voltage values detected by the ac charging positive electrode and negative electrode;

step S414, VCU sends the maximum allowable AC charging voltage and current (i.e. maximum allowable charging power) of OBC, PACK;

the OBC feeds back the maximum output charging power per se;

step S415, the OBC starts charging the PACK;

step S416, the VCU calculates the refrigerating power/heating power required by the battery pack according to the cold quantity or heat quantity requirement of the BMS, sends the refrigerating power/heating power to the refrigerating module/heating module, meets the heating or refrigerating power of the battery pack, and is smaller than the actual output power of the vehicle-mounted charger;

step S417, if the BMS sends a charge cutoff condition to the VCU; or an abnormal termination; or stopping manually, executing step S418, otherwise, continuing to execute step S415;

step S418, the VCU sends charging completion and stop commands to the OBC, and unlocks the electronic lock;

OBC shutdown, and switch S2 open;

step S419, the VCU commands the refrigeration module/heating module to stop working;

step S420, the AC charging gun can be pulled out;

step S421, the VCU commands the DCDC to stop working;

step S422, the VCU sends a high voltage connection disconnection command to the BMS;

step S423, the BMS turns off the main positive relay and the main negative relay in sequence;

step S424, the VCU commands the BMS to sleep, and the hard wire is waken up and cancelled;

the OBC cancels the hard line to wake up the VCU;

the OBC, VCU and other controllers enter a sleep state.

In one embodiment, the method further comprises:

The embodiment treats the abnormal condition in the charging process.

FIG. 5 is a flow chart of exception handling according to the preferred embodiment of the present invention, which includes:

step S501, when the card swiping is stopped, the charging pile CP signal Pulse Width Modulation (PWM) is interrupted, and step S510 is executed;

step S502, the charging gun is abnormal in connection with CC, if the gun seat (the charging gun and the charging seat) is in a semi-connection state, the gun seat is checked back within the preset time, the instrument panel prompts after overtime, and the step S509 is executed, otherwise, the gun seat is not connected or the resistance of RC and R4 are abnormal, the step S509 is executed;

step S503, detecting abnormal guide CP, if the output voltage is abnormal or the amplitude and duty ratio of PWM are overrun, executing step S509;

step S504, the electronic lock is in failure, if the electronic lock cannot be unlocked, the electronic lock is detected once per minute, if the electronic lock cannot be unlocked for more than a plurality of times, the electronic lock is prompted on an instrument panel to execute step S509, and if the electronic lock cannot be locked, the OBC charging current and the power are derated to execute step S509;

step S505, the charging cradle is over-temperature, if the charging cradle temperature is greater than the first temperature, step S509 is executed, if the charging cradle temperature is greater than or equal to the second temperature and less than or equal to the first temperature, the OBC charging current is derated, the power is derated, and the first temperature is greater than the second temperature;

step S506, OBC cycle self-checking, if the AC voltage is abnormal, or the PACK voltage value is detected to be abnormal, or the communication is overtime, interrupted, or the output overcurrent, overvoltage, undervoltage, power module overtemperature, damage of the switch S2, short circuit and the like, executing step S509;

step S507, other controllers or components are in fault, if the VCU is determined to be in serious fault, step S510 is executed, otherwise the VCU commands the OBC to charge current derating and power derating;

step S508, the BMS reports a fault, if the insulation value of the system is low, or the battery cell is charged in overvoltage, or the charging current is over-current, or the battery cell is over-temperature, the VCU orders the OBC to stop charging, and step S510 is executed;

step S509, recording fault codes;

step S510, the OBC closes high-voltage output;

step S511, turning off the OBC built-in switch S2;

step S512, the OBC state is standby dormancy;

and step S513, periodic return check is carried out, if the fault disappears, the fault code is recorded, and charging is recovered, otherwise, charging is finished.

The invention reduces the cost of the charging system as much as possible, and eliminates unnecessary parts through the perfection of the charging control method or strategy and the optimization of the hardware architecture. And secondly, the VCU is set as the highest priority controller, other controllers are controlled in an integrated mode, and the charging process is completed safely, reliably and comprehensively. And thirdly, a battery thermal management control method is added in the charging process, so that the battery is prevented from being in an extreme thermal runaway temperature interval.

The invention saves cost, the cost of the AC relay is about 150 yuan, the sampling wire bundle for monitoring the adhesion of the relay is about 5 yuan, the power supply wire bundle of the relay is about 5 yuan, and a single vehicle saves about 160 yuan after being removed. Meanwhile, after the alternating current relay is removed, the BMS (battery management system) does not need to control the on and off of the alternating current relay, and the BMS does not need to periodically detect the adhesion state of the alternating current relay, so that the cpu occupancy rate and the memory are reduced. Therefore, the control method is simplified, and the time of the charging starting stage and the charging ending stage is saved by about 2 s. The VCU is a "master" and has the highest priority control right, and receives information of each controller and controls the operation of the other controllers during the charging process. And timely processing various abnormal conditions. Compared with the traditional charging control method, the method can reduce the failure rate by about 5 percent, thereby improving the safety and the reliability. Finally, the invention gives consideration to the thermal management (refrigeration or heating) of the battery in the alternating current charging process, so that the battery is positioned in the temperature range of 20-35 ℃ which is most suitable for charging. At the moment, the battery cell is in the SOC 5-95% range, the maximum chargeable current reaches 0.2C-1C (C is the battery capacity, and 1C current is the current outputting the same magnitude as the battery capacity, for example, the capacity of a certain battery cell is 150AH, the 1C current is 150A, and the continuous discharge is 1h, and similarly, the 0.2C current is 30A).

Fig. 7 is a schematic diagram of a hardware structure of a vehicle control unit of an electric vehicle according to the present invention, where the electronic device includes:

at least one processor 701; and (c) a second step of,

a memory 702 communicatively coupled to at least one of the processors 701; wherein the content of the first and second substances,

the memory 702 stores instructions executable by the at least one processor 701, and the instructions are executed by the at least one processor 701, so that the at least one processor 701 can execute the charging control method for the whole electric vehicle controller as described above.

Specifically, the Electronic device may be an Electronic Control Unit (ECU) of an automobile, such as a controller of a VCU. One processor 701 is illustrated in fig. 4.

The processor 701 and the memory 702 may be connected by a bus or by other means, such as a bus.

The memory 702 is a non-volatile computer-readable storage medium, and can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as program instructions/modules corresponding to the charging control method of the electric vehicle controller in the embodiment of the present application, for example, the method flow shown in fig. 1. The processor 701 executes various functional applications and data processing by executing the nonvolatile software programs, instructions and modules stored in the memory 702, so as to implement the charging control method for the vehicle control unit of the electric vehicle in the above embodiment.

The memory 702 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the electric vehicle controller charging control method, and the like. Further, the memory 702 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, memory 702 may optionally include memory located remotely from processor 701, which may be connected over a network to a device executing the electric vehicle controller charging control method. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

When the one or more modules are stored in the memory 702 and executed by the one or more processors 701, the electric vehicle controller charging control method in any method embodiment is executed.

The invention redesigns the charging system architecture of a power battery system (PACK) without an alternating current relay, takes a whole vehicle controller VCU as a 'host machine' and other controllers as 'slave machines', receives the control of the VCU in the charging process, realizes the tight communication, the joint debugging and the action, and thereby safely, reliably and quickly finishes the charging process.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims

1. A charging control method for a vehicle control unit of an electric vehicle is characterized by comprising the following steps:

forbidding the motor to run, and controlling the vehicle to park;

when the parking completion of the vehicle is received, sending a self-checking command to the high-voltage component of the vehicle;

2. The charging control method for the vehicle controller of the electric vehicle according to claim 1, wherein when the vehicle parking completion is received, a self-test command is sent to a vehicle high-voltage component, and the method specifically comprises the following steps:

and sending a self-checking command to the high-voltage component of the vehicle.

3. The charging control method for the vehicle control unit of the electric vehicle according to claim 1, wherein the step of obtaining the charging parameters from the battery management system, sending the charging parameters to the vehicle-mounted charger, and controlling the vehicle-mounted charger to start charging the power battery system specifically comprises the steps of:

4. The charging control method of the vehicle control unit of the electric vehicle according to claim 3, wherein the controlling the vehicle-mounted charger to stop charging the power battery system in response to the charging stop event specifically comprises:

and controlling the refrigeration module or the heating module to stop working.

5. The charging control method for the vehicle control unit of the electric vehicle according to claim 1, wherein when the electric vehicle is in a dormant state, the method further comprises:

and waking up the battery management system.

6. The charging control method of the vehicle control unit of the electric vehicle according to claim 5, wherein if the self-test of all the high-voltage components of the vehicle is normal, the method obtains the charging parameters from the battery management system, sends the charging parameters to the vehicle-mounted charger, and controls the vehicle-mounted charger to start charging the power battery system, and specifically comprises the following steps:

7. The charging control method of the vehicle control unit of the electric vehicle according to claim 6, wherein when a high-voltage connection success signal of the battery management system is received, the charging parameter is obtained from the battery management system, the charging parameter is sent to the vehicle-mounted charger, and the vehicle-mounted charger is controlled to start charging the power battery system, and the method specifically comprises the following steps:

8. The charging control method of the vehicle control unit of the electric vehicle according to claim 6, wherein the controlling the vehicle-mounted charger to stop charging the power battery system in response to the charging stop event specifically comprises:

controlling the battery management system to sleep;

and the vehicle control unit enters the sleep mode.

9. The charging control method for the vehicle control unit of the electric vehicle according to any one of claims 1 to 8, further comprising:

10. The vehicle control unit of the electric automobile is characterized by comprising:

at least one processor; and the number of the first and second groups,

the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the electric vehicle controller charging control method according to any one of claims 1 to 9.