CN215752026U

CN215752026U - New energy automobile is to outer discharge control system

Info

Publication number: CN215752026U
Application number: CN202120783543.0U
Authority: CN
Inventors: 朱甲甲; 徐鹏; 李涛
Original assignee: Chery Commercial Vehicle Anhui Co Ltd
Current assignee: Wuhu Tairui Automobile Co ltd
Priority date: 2021-04-16
Filing date: 2021-04-16
Publication date: 2022-02-08
Anticipated expiration: 2031-04-16

Abstract

The utility model discloses an external discharge control system of a new energy automobile, which comprises an INV (inverse vertical inverter) module, a relay, a power battery and a battery management system BMS (battery management system), wherein the relay is connected between the power battery and the INV module in series, and the output end of the INV module is used for being connected with a discharge interface; the output end of the battery management system BMS is connected with the relay; the control system also comprises a vehicle control unit VCU and a discharge ending condition input module, wherein the output end of the discharge ending condition input module is connected with the input end of the vehicle control unit VCU; the VCU of the vehicle control unit is respectively connected with the BMS and the INV inversion module and used for acquiring state information acquired by the BMS and the INV inversion module and/or sending control instructions to the BMS and the INV inversion module. The process of discharging can be automatically controlled according to the actual demand of a user, the requirements of over-discharging or influencing the endurance mileage of the user are prevented, and the reliability of the system and the user experience are improved.

Description

New energy automobile is to outer discharge control system

Technical Field

The utility model relates to the field of power utilization management of new energy automobiles, in particular to an external discharge control system of a new energy automobile.

Background

The new energy automobile comprises a pure electric or hybrid new energy automobile, a power battery of the pure electric or hybrid new energy automobile is an energy source for driving the automobile to run, the SOC (state of charge) or the remaining endurance mileage of the power battery is one of the most concerned indexes of a driver, and at present, the system of the new energy automobile has rich functions and high intelligent degree, so that the management of the SOC and the remaining endurance mileage of the power battery is particularly important, and especially on the new energy automobile supporting the external discharge function. When the electric quantity of the power battery is sufficient, the power battery can be discharged outwards at some special moments for emergency or special requirement use of customers, but improper management of the electric quantity of the battery can cause the result that the automobile cannot be started to run, so that inconvenience is brought to the customers; the new energy automobile in the prior art does not have any control on discharging, and if the new energy automobile is not closed manually after being started, discharging is carried out until the power is deficient, and the like, so that certain defects exist in the running of the automobile.

Moreover, the prior art has the following main defects:

1) when the external discharge function is used on the new energy automobile supporting the external discharge function, the SOC and the remaining endurance mileage cannot be intelligently controlled, and the requirement of a customer on the remaining mileage or the SOC is met;

2) an over-discharge phenomenon may exist, which leads to the life decay of the power battery;

3) the discharging can not be automatically finished to protect the requirements of endurance and battery capacity.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve at least one technical problem and provides an external discharge control system of a new energy automobile, which is used for controlling the discharge and reducing or avoiding the defect of vehicle power shortage or insufficient endurance caused by over discharge.

In order to achieve the purpose, the utility model adopts the technical scheme that: the new energy automobile external discharge control system comprises an INV (inverse vertical inverter) module, a relay, a power battery and a battery management system BMS (battery management system), wherein the relay is connected between the power battery and the INV module in series, and the output end of the INV module is used for being connected with a discharge interface; the output end of the battery management system BMS is connected with the relay and used for controlling the on-off of the relay; the control system also comprises a vehicle control unit VCU and a discharge ending condition input module, wherein the output end of the discharge ending condition input module is connected with the input end of the vehicle control unit VCU and is used for inputting the discharge ending condition into the vehicle control unit VCU; the VCU of the vehicle control unit is respectively connected with the BMS and the INV inversion module and used for acquiring state information acquired by the BMS and the INV inversion module and/or sending control instructions to the BMS and the INV inversion module.

The discharging end condition input module is a human-computer interaction system HMI, and the discharging end condition is input through the human-computer interaction system HMI.

The battery management system BMS acquires the SOC value of the current power battery through a detection circuit and/or calculates the endurance mileage of the power battery according to a preset calculation program; the VCU of the vehicle control unit acquires a current SOC value and/or a current endurance mileage in the battery management system, and sends a control signal to control the work of a BMS and an INV inversion module of the battery management system after comparing the current SOC value and/or the current endurance mileage with a set SOC threshold value or endurance mileage threshold value.

And the VCU of the vehicle control unit is respectively connected with the BMS and the INV inversion module through a vehicle-mounted network.

And the vehicle control unit VCU is connected with the vehicle fault state detection module and used for sending a discharging stopping instruction to the battery management system BMS after the vehicle control unit VCU detects that the fault occurs.

And the vehicle control unit VCU and the discharge interface connection state detection module are used for detecting the connection state of the discharge gun and the discharge interface, and the vehicle control unit VCU sends a discharge stopping instruction to the battery management system BMS after the connection state is disconnected.

The vehicle control unit VCU is connected with the vehicle charging interface connection state detection module, and when the fact that the charging interface is connected with the charging gun is detected, the vehicle control unit VCU sends a discharging stopping instruction to the battery management system BMS after the connection state is disconnected.

The utility model has the advantages that: the HMI is used for setting a threshold value of an external discharge function ending condition, and the threshold value is sent to the VCU through the CAN network, so that the setting is convenient, fast and understandable, the discharge process CAN be automatically controlled according to the actual demand of a user, the over-discharge or the influence on the requirement of the endurance mileage of the user CAN be prevented, and the reliability of the system and the user experience CAN be improved; the VCU integrates the end conditions set by the client, the whole vehicle fault and the like to control the external discharging process, and the discharging process is more reasonably and reliably controlled; the external discharge process is safe and controllable, and different requirements of customers on SOC or residual endurance mileage are met. The power supply gear (Ready/ON/ACC/OFF) and the driving gear (P/R/N/D) of the whole vehicle are not required, and the use threshold of a customer is reduced.

Drawings

The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:

FIG. 1 is a schematic diagram of the control system architecture of the present invention;

FIG. 2 is a flow chart of the control system principle of the present invention.

Detailed Description

The following description of preferred embodiments of the utility model will be made in further detail with reference to the accompanying drawings.

As shown in fig. 1, the new energy automobile external discharge control system comprises an INV inversion module, a relay, a power battery, a battery management system BMS, a discharge end condition input module, and a vehicle control unit VCU, wherein the relay is connected in series between the power battery and the INV inversion module, an output end of the INV inversion module is used for being connected with a discharge interface, and the power battery is output by the INV inversion module after passing through the relay and the INV inversion module and is supplied with power to the discharge interface, so as to be discharged externally; the discharging interface is realized by adopting a slow charging interface on the electric automobile.

The output end of the battery management system BMS is connected with the relay and used for controlling the on-off of the relay; when the control relay is closed, the power supply loop is closed, and the INV can be output to the outside as long as the INV works in an inversion state.

The output end of the discharging end condition input module is connected with the input end of the VCU of the vehicle controller and is used for inputting the discharging end condition into the VCU of the vehicle controller; the discharging end condition input module adopts a human-computer interaction system HMI, and a discharging end condition threshold value is input through the human-computer interaction system HMI. The discharging end threshold is an SOC threshold or a cruising mileage threshold, so that a battery of the electric automobile is a power source and mainly meets the SOC requirement or cruising requirement of a user to perform discharging control.

The VCU is respectively connected with the BMS and the INV inversion module and used for acquiring state information acquired by the BMS and the INV inversion module and sending control instructions to the BMS and the INV inversion module.

In the BMS, the SOC value of the current power battery is acquired through a detection circuit, and the driving range of the power battery (self-contained in the BMS) is calculated according to a preset calculation program; the VCU of the vehicle control unit acquires a current SOC value and/or a current endurance mileage in the battery management system, and sends a control signal to control the work of a BMS and an INV inversion module of the battery management system after comparing the current SOC value and/or the current endurance mileage with a set SOC threshold value or endurance mileage threshold value. And if the current driving mileage is smaller than the set threshold or the current SOC is smaller than the set threshold, the VCU sends control signals to the BMS and the INV respectively to control the INV to stop working and control the BMS to disconnect the relay.

And the VCU of the vehicle control unit and the discharge interface connection state detection module are used for detecting the connection state of the discharge gun and the discharge interface, and the VCU of the vehicle control unit sends a discharge stopping instruction to the BMS after the connection state is disconnected. The discharging interface is a slow charging interface state, a general INV module can detect the signal, after a discharging gun is inserted into the slow charging interface, the INV receives a state signal and feeds the state signal back to the VCU, the VCU judges whether the discharging requirement is met through an SOC threshold value or a mileage threshold value written in by an HMI, if the SOC is larger than the SOC threshold value or the mileage is larger than the mileage threshold value, and a fault or charging state signal is not detected in the whole vehicle, discharging is allowed, the VCU sends a control instruction to the INV and the BMS, the INV works in an inversion state, the BMS controls the relay to be closed, otherwise, discharging is not allowed, and the VCU sends a signal that discharging is not allowed through an indicator lamp.

The whole vehicle fault state is detected by the whole vehicle fault state detection module, and the whole vehicle controller VCU is connected with the whole vehicle fault state detection module and used for sending a discharging stopping instruction to the battery management system BMS after the whole vehicle detects that the fault occurs. When the whole vehicle has no fault, the whole vehicle is not charged, the SOC and the endurance mileage of the whole vehicle meet the requirements, discharging is allowed, and a discharging control instruction is sent out, otherwise, the discharging control instruction is not sent out; during the discharge, the discharge is disconnected in either case: the failure of the whole vehicle, charging of the whole vehicle, and SOC or endurance mileage are less than a set threshold value. The charging state is detected by the fact that the vehicle charging interface is connected with the charging gun, and the vehicle control unit VCU sends a discharging stopping instruction to the battery management system BMS after the connection state is disconnected. The fault of the whole vehicle CAN be judged by the VCU through self-checking and reading fault codes on the CAN network; whether the charging port has a charging gun inserted is detected by the BMS.

A management system for an external discharge process of a new energy automobile comprises a power battery, an Inverter (INV), a power system management module (BMS), a Vehicle Control Unit (VCU) and a human-computer interaction interface (HMI).

The HMI is used as an entrance of the function, and a driver can set an ending condition threshold value of the external discharging function through the HMI, wherein the ending condition can be the remaining SOC or the remaining driving range (alternative), for example, the remaining SOC of the power battery is used as the ending condition, the external discharging cut-off SOC can be set through the HMI, and the SOC can be set in a certain range (for example, 10% -50% is set, and the default maximum value is set). And setting the outer discharge cutoff endurance mileage through the HMI by taking the residual endurance mileage as an end condition, wherein the endurance mileage can be set within a certain range (for example, the maximum value is set between 50km and 150km by default), and after the setting is finished, sending the setting information through a vehicle-mounted network and receiving the setting information by the VCU. The VCU is used as a main controller of an external discharging process, and the external discharging process is controlled by integrating the state of the whole vehicle and the current SOC or the remaining endurance mileage. The BMS receives and sends related network signals through a finished automobile CAN network, controls the high-voltage relay, executes VCU instructions and feeds back the self state. The INV is used as an executing mechanism of an external discharging function, detects and distinguishes the connection state of the charging/discharging gun, receives and transmits related signals through the CAN network, and executes a VCU instruction to finish the external discharging function.

The scheme has the advantages that:

1) the HMI sets the threshold value of the external discharge function ending condition and sends the threshold value to the VCU through the CAN network, and the setting is convenient, fast and easy to understand.

2) The VCU integrates the end conditions set by the client and the faults of the whole vehicle to control the external discharging process.

3) The external discharge process is safe and controllable, and different requirements of customers on SOC or residual endurance mileage are met.

4) The utility model has no requirements ON the power supply gear (Ready/ON/ACC/OFF) and the driving gear (P/R/N/D) of the whole vehicle, and reduces the use threshold of a customer.

Enter into discharge-to-outside function:

after the vehicle is stationary and stable, the client uses a special discharging gun (one end is a gun head, the other end is a socket) which is equipped on the vehicle to connect the gun head end into the slow charging port of the vehicle, a switch button on the socket end at the other end is pressed, a work indicator lamp on the socket is turned on, namely, the work indicator lamp is in a ready state for an external discharging function, and the client can enter the external discharging function after connecting the electric appliance.

Exit to external discharge function:

the driver may exit the external discharge function by performing the following operations:

1) the power gun is turned off, namely when the driver manually turns off the power gun, the VCU receives the disconnection state of the discharge gun and then finishes the process of discharging outwards;

2) the whole vehicle fault, if more than two-stage fault occurs in the external discharge process, the external discharge process is ended;

3) connecting a quick charging gun, namely ending an external discharging process if a driver actively connects the quick charging gun in the external discharging process;

4) remaining endurance mileage, namely ending the external discharge process if the current remaining endurance mileage is less than or equal to the limit value of the external discharge function remaining endurance mileage set by the customer through the HMI;

5) and residual SOC, namely if the current residual SOC is less than or equal to the external discharge function SOC limit set by the client through the HMI, ending the external discharge process.

New energy automobile is system of discharging outward, including power battery, INV contravariant module, relay, vehicle control unit VCU, power management system BMS and human-computer interaction system HMI, characterized by: the power battery is connected with the INV discharging module through a relay, the INV output end is connected with the slow charging end of the automobile, and the VCU, the HMI, the INV and the BMS are communicated with each other through a CAN network.

When the automobile is stopped stably, the discharging gun is correctly inserted into the automobile slow charging port, the INV detects that the discharging gun is correctly connected, the state of the discharging gun is sent to the VCU, the HMI sends a residual endurance mileage limit value or an SOC limit value signal set by a customer to the VCU (the HMI selects one of two setting modes, and after the setting is finished, the VCU records customer setting data), and the BMS sends the current SOC of the power battery, the current residual endurance mileage and the relay state to the VCU.

The VCU receives the relevant signals and then comprehensively judges the fault state of the whole vehicle, when the discharging conditions are met, an external discharging instruction is sent to the BMS, the BMS controls the high-voltage relay to be closed and feeds the state of the relay back to the VCU, and the VCU receives the relay connection state and then requests the INV working mode to enter the external discharging state. At the moment, the customer can use the external discharging function, the VCU monitors the external discharging condition in real time in the whole external discharging process, and the external discharging process is ended once the exit condition occurs.

As shown in fig. 2, a schematic diagram of discharge control is shown, and one of the control logics in the present application is as follows:

s201: after the vehicle is stopped stably, a customer inserts the discharging gun into a slow charging port of the vehicle, sets an external discharging function stopping condition SOC or a residual mileage threshold value (the residual SOC or the residual mileage is set to be one of two) through a human-computer interaction system, the operation is not sequential, after the setting is finished, setting data are sent to a VCU through a CAN network, and the VCU records the customer setting data (if the threshold value of the external discharging finishing condition set through a human-computer interaction interface in the external discharging process is smaller than the real-time numerical value of the current vehicle, the external discharging process is immediately stopped).

And S202, INV detects and judges whether the discharging gun is correctly connected or not, and sends a correct connecting signal of the discharging gun to a VCU through a CAN network.

S203: after the VCU receives the correct connection signal of the discharging gun, the fault level, the residual driving mileage or the current SOC of the whole vehicle are judged at the same time (the current SOC and the set SOC are judged according to the customer setting item if the customer setting item is the SOC, and the current residual driving mileage and the set residual mileage are judged if the customer setting item is the residual driving mileage), and the discharging permission instruction is sent to the BMS when the fault level of the whole vehicle is less than or equal to the second level and the current SOC or the residual driving mileage is more than the lower limit set by the customer.

S204: and after receiving the discharge permission instruction sent by the VCU, the BMS controls the relay to be closed and feeds the state of the relay back to the VCU.

S205: after the VCU confirms that the relay is correctly closed, the INV module is requested to enter an external discharging mode, the safety switch on the socket is pressed at the moment, the work indicating lamp on the socket is lightened, and a customer can use the electric energy of the battery.

S206: in an external discharging process, the VCU monitors whether an exit condition occurs in real time, and enters a power-off process once the exit condition occurs.

S207: and when the exit condition occurs, the VCU control system enters a high-voltage power-off process, requests the INV to enter a standby mode and sends a discharge prohibition instruction to the BMS.

S208: the system judges the power supply gear of the vehicle at the moment after finishing high-voltage reduction and judges whether to enter the dormancy so as to save the electric quantity.

It is clear that the specific implementation of the utility model is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the utility model.

Claims

1. The new energy automobile external discharge control system comprises an INV (inverse vertical inverter) module, a relay, a power battery and a battery management system BMS (battery management system), wherein the relay is connected between the power battery and the INV module in series, and the output end of the INV module is used for being connected with a discharge interface; the output end of the battery management system BMS is connected with the relay and used for controlling the on-off of the relay; the method is characterized in that: the control system also comprises a vehicle control unit VCU and a discharge ending condition input module, wherein the output end of the discharge ending condition input module is connected with the input end of the vehicle control unit VCU and is used for inputting the discharge ending condition into the vehicle control unit VCU; the VCU of the vehicle control unit is respectively connected with the BMS and the INV inversion module and used for acquiring state information acquired by the BMS and the INV inversion module and/or sending control instructions to the BMS and the INV inversion module.

2. The external discharge control system of the new energy automobile as claimed in claim 1, characterized in that: the discharging end condition input module is a human-computer interaction system HMI, and the discharging end condition is input through the human-computer interaction system HMI.

3. The new energy automobile external discharge control system as claimed in claim 1 or 2, characterized in that: the battery management system BMS acquires the SOC value of the current power battery through a detection circuit and/or calculates the endurance mileage of the power battery according to a preset calculation program; the VCU of the vehicle control unit acquires a current SOC value and/or a current endurance mileage in the battery management system, and sends a control signal to control the work of a BMS and an INV inversion module of the battery management system after comparing the current SOC value and/or the current endurance mileage with a set SOC threshold value or endurance mileage threshold value.

4. The new energy automobile external discharge control system as claimed in claim 1 or 2, characterized in that: and the VCU of the vehicle control unit is respectively connected with the BMS and the INV inversion module through a vehicle-mounted network.

5. The new energy vehicle external discharge control system according to claim 1 or 2, characterized in that: and the vehicle control unit VCU is connected with the vehicle fault state detection module and used for sending a discharging stopping instruction to the battery management system BMS after the vehicle control unit VCU detects that the fault occurs.

6. The new energy automobile external discharge control system as claimed in claim 1 or 2, characterized in that: and the vehicle control unit VCU and the discharge interface connection state detection module are used for detecting the connection state of the discharge gun and the discharge interface, and the vehicle control unit VCU sends a discharge stopping instruction to the battery management system BMS after the connection state is disconnected.

7. The new energy automobile external discharge control system as claimed in claim 1 or 2, characterized in that: the vehicle control unit VCU is connected with the vehicle charging interface connection state detection module, and when the fact that the charging interface is connected with the charging gun is detected, the vehicle control unit VCU sends a discharging stopping instruction to the battery management system BMS after the connection state is disconnected.