CN115693881A

CN115693881A - Vehicle discharge system, control method thereof and vehicle

Info

Publication number: CN115693881A
Application number: CN202211355878.8A
Authority: CN
Inventors: 饶俊威; 张安伟; 朱永明; 周文太; 黄河; 关佳景
Original assignee: Guangzhou Automobile Group Co Ltd
Current assignee: Guangzhou Automobile Group Co Ltd
Priority date: 2022-11-01
Filing date: 2022-11-01
Publication date: 2023-02-03

Abstract

The application provides a discharge system of a vehicle, a control method of the discharge system and the vehicle. The discharging system of the vehicle comprises an engine, a generator, a motor controller and a first discharging control circuit; the engine is used for driving the generator to generate electricity; the motor controller is connected to the electric energy output end of the generator and comprises an electric energy conversion module, and the electric energy conversion module is used for converting alternating current output by the generator into specific direct current; the first discharge control circuit is connected between the output end of the motor controller and an electric energy output port of a vehicle to control the on-off of a charging path between the motor controller and the electric energy output port. Therefore, the scheme of the application enables the vehicle to be free from additionally configuring a V2V charger, and effectively improves the charging convenience.

Description

Vehicle discharge system, control method thereof and vehicle

Technical Field

The application relates to the field of vehicle charging, in particular to a discharging system of a vehicle, a control method of the discharging system and the vehicle.

Background

The electric vehicle is equipped with a large-capacity electric energy storage device, and when the electric vehicle has an electric energy output function outside the vehicle, the vehicle can be regarded as a movable energy storage power supply. The vehicle with the function of discharging electricity to the outside can provide electric energy for loads of family or emergency rescue, namely V2L (vehicle-to-load); other electric vehicles, i.e., V2V (vehicle-to-vehicle), may be provided with the charging service. Consumers have higher and higher requirements on automobile user experience, and the problems of road rescue and the like can be solved by developing a V2V direct current discharge function, so that the use value of an automobile is improved.

At present, the common practice in the market is to add V2V equipment, and the electric energy transfer between two electric vehicles can be realized through the V2V equipment. However, the V2V device occupies a large space, which is not favorable for the user to carry and use with the vehicle.

The above information disclosed in this background section is only for enhancement of understanding of the background of the application and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.

Disclosure of Invention

An object of the present application is to provide a discharge system of a vehicle to improve convenience of external discharge.

In order to solve the technical problem, the following technical scheme is adopted in the application:

according to one aspect of the present application, there is provided a discharge system of a vehicle, including:

the engine is used for driving the generator to generate electricity;

the motor controller is connected to the electric energy output end of the generator and comprises an electric energy conversion module, and the electric energy conversion module is used for converting alternating current output by the generator into specific direct current;

the first discharge control circuit is connected between the output end of the motor controller and an electric energy output port of a vehicle to control the on-off of a charging path between the motor controller and the electric energy output port.

According to an embodiment of the present application, the first discharge control circuit includes a first total positive switch, a first total negative switch;

the first main positive switch is connected between the positive pole of the output end of the motor controller and the positive pole of the electric energy output port; the first total negative switch is connected between the positive pole of the output end of the motor controller and the negative pole of the electric energy output port.

According to an embodiment of the present application, the first discharging control circuit further includes a first pre-charging circuit, the first pre-charging circuit includes a first pre-charging switch and a first current limiting device;

the first pre-charging switch is connected with the first current limiting device in series, and the first pre-charging switch is connected with the first current limiting device in series and then connected with the first main switch in parallel.

According to an embodiment of the present application, the discharging system of the vehicle further includes a power battery and a second discharging control circuit;

the power battery is connected in parallel with two ends of the motor controller, and a change-over switch is connected in series on a branch where the power battery or the motor controller is located;

the second discharging circuit is connected between the output end of the power battery and an electric energy output port of a vehicle to control the on-off of a charging path between the power battery and the electric energy output port.

According to an embodiment of the present application, the second discharge control circuit includes a second total positive switch and a second total negative switch;

the second main positive switch is connected between the positive pole of the power battery and the positive pole of the output end of the motor controller; the second total negative switch is connected between the negative electrode of the power battery and the negative electrode of the output end of the motor controller;

the second discharging control circuit further comprises a second pre-charging circuit, and the second pre-charging circuit comprises a second pre-charging switch and a second current-limiting device;

the second pre-charge switch is connected in series with the second current limiting device, and the second pre-charge switch is connected in series with the second current limiting device and connected in parallel with the second main positive switch.

According to an embodiment of the present application, the discharging system of the vehicle further includes a charge control switch connected on a path between the positive electrode of the output terminal of the motor controller and the second total positive switch, and located on a path between the first total positive switch and the second total positive switch.

According to an embodiment of the application, the electric energy outlet is a standard quick charging port or a standard slow charging port of the vehicle.

According to another aspect of the present application, a vehicle includes a vehicle body and a vehicle discharge system disposed within the vehicle body, as described; the vehicle body is provided with an electric energy output port, and the vehicle discharging system charges a vehicle to be charged through the electric energy output port.

According to another aspect of the present application, a control method of a discharge system of a vehicle for the vehicle discharge system; the method comprises the following steps:

identifying a type of a charging connector gun head inserted into an electrical power outlet on the vehicle;

when the gun head type of the charging connecting device is discharging robbery, sending charging device identity information to a vehicle to be charged for being identified as a charging device by the vehicle to be charged;

acquiring charging demand information of a vehicle to be charged;

and controlling the output power of the vehicle discharging system based on the charging demand information of the vehicle to be charged so as to output electric energy to the vehicle to be charged.

According to one embodiment of the present application, the vehicle discharge system includes an engine, a motor, and a motor controller; the charging demand information of the vehicle to be charged includes charging power of the vehicle to be charged that is allowed to be input;

the controlling the output power of the vehicle discharging system based on the charging demand information of the vehicle to be charged to output electric energy to the vehicle to be charged includes:

acquiring the energy allowed to be output by the engine and the power allowed to be output by the generator;

determining the charging power allowed to be output by the vehicle based on the energy allowed to be output by the engine and the power allowed to be output by the generator;

controlling the operation of the engine and the generator according to the smaller value between the allowable input charging power of the vehicle to be charged and the allowable output charging power of the vehicle; and controls the first discharge control circuit to be turned on.

According to an embodiment of the present application, the first discharge control circuit includes a first total positive switch, a first total negative switch, and a first pre-charge switch;

the controlling the first discharge control circuit to be turned on includes:

in the initial charging stage, a first pre-charging switch and a first total negative switch are opened, so that the power output by the motor controller is pre-charged for the vehicle to be charged;

after the pre-charging is finished, the first pre-charging circuit is disconnected, the first total positive switch is opened, and the power output by the motor controller is input to the vehicle to be charged through the first total positive switch.

According to an embodiment of the present application, the vehicle discharge system includes a power battery; the charging demand information of the vehicle to be charged comprises charging power allowed to be input by the vehicle to be charged;

acquiring the charging power allowed to be output by the power battery;

controlling the power battery to output electric energy according to the smaller value between the allowable input charging power of the vehicle to be charged and the allowable output power of the power battery; and controls the second discharge control circuit to be turned on.

According to an embodiment of the present application, the second discharge control circuit includes a second total positive switch, a second total negative switch, and a second precharge switch;

the control second discharge control circuit switches on, including:

in the initial charging stage, opening the second pre-charging switch, the second total negative switch, the first total positive switch and the first total negative switch to pre-charge the vehicle to be charged by the power battery;

after the pre-charging is finished, the second pre-charging switch is disconnected, the second total positive switch is opened, the first total positive switch and the first total negative switch are kept opened, and electric energy output by the power battery is input to the vehicle to be charged through the second total positive switch.

The scheme of the application utilizes the existing engine and generator in the vehicle to generate electricity, and the electric energy conversion module is integrated in the motor controller, so that alternating current electric energy which can be sent out by the generator is converted into direct current electric energy which can be received by the vehicle to be charged, and the charging of the vehicle to be charged is realized. Therefore, the scheme of the application enables the vehicle to be free of additional arrangement of a V2V charger, and charging convenience is effectively improved. In addition, the advantages of the existing engine, the existing generator and the existing motor controller in the vehicle are utilized, the existing communication interaction function is utilized to realize charging of other vehicles, and the production cost is effectively reduced on the premise that the vehicle is configured with the charging function.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The above and other objects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

Fig. 1 is a block diagram showing electrical connections of a vehicle discharging system and a vehicle to be charged according to an embodiment.

FIG. 2 is a schematic diagram illustrating electrical connections of a vehicle discharge system according to one embodiment.

FIG. 3 is a flow chart illustrating a vehicle discharge system control method according to one embodiment.

FIG. 4 is a flowchart illustrating step S44 of FIG. 3 according to one embodiment.

Fig. 5 is a flowchart illustrating step S44 in fig. 3 according to another embodiment.

The reference numerals are illustrated below:

1. a vehicle; 10. an engine; 11. a vehicle controller; 12. a generator; 13. a motor controller; 14. a generator management system; 15. battery management systems (in discharging vehicles); 16. a power battery; 171. a first always positive switch; 172. a first total negative switch; 173. a first pre-charge switch; 174. a first current limiting device; 175. a charge control switch; 181. a second total positive switch; 182. a second master negative switch; 183. a second pre-charge switch; 184. a second current limiting device; 19. an electric power outlet;

2. a vehicle to be charged; 21. a battery management system (in the vehicle to be charged); 22. a battery; 23. a charging port;

3. and a charging connection device.

Detailed Description

While this application is susceptible of embodiment in different forms, there is shown in the drawings and will herein be described in detail only some specific embodiments thereof with the understanding that the present disclosure is to be considered as an exemplification of the principles of the application and is not intended to limit the application to that as illustrated herein.

Thus, a feature indicated in this specification is intended to describe one of the features of an embodiment of the application and does not imply that every embodiment of the application must have the described feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.

In the embodiments shown in the drawings, directional references (such as up, down, left, right, front, and rear) are used to explain the structure and movement of the various elements of the present application not absolutely, but relatively. These illustrations are appropriate when the elements are in the positions shown in the figures. If the description of the positions of these elements changes, the indication of these directions changes accordingly.

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present application and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.

The preferred embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

The present application provides a discharge system of a vehicle. The type of the vehicle may be a Plug-in hybrid electric vehicle (PHEV), or an extended range vehicle. For the plug-in hybrid electric vehicle model, the driving mode of the hybrid electric system in the plug-in hybrid electric vehicle is not limited in the application, and the plug-in hybrid electric vehicle model can be a series hybrid electric system, a parallel hybrid electric system or a series-parallel hybrid electric system.

The discharging system of the vehicle in the application can charge other vehicles and can also charge other energy storage devices, and the discharging system is not limited herein. In the following embodiments, a vehicle in the present application is referred to as a discharging vehicle, and a device to be charged is exemplified as a vehicle to be charged.

In one embodiment, the discharge system of the discharge vehicle 1 includes an engine 10, a generator 12, a motor controller 13, and a first discharge control circuit. The engine 10 is used for driving the generator 12 to generate electricity; the motor controller 13 is connected to an electric energy output end of the generator 12, the motor controller 13 includes an electric energy conversion module 131, and the electric energy conversion module 131 is used for converting the alternating current output by the generator 12 into a specific direct current; the first discharge control circuit is connected between the output end of the motor controller 13 and the electric energy output port 19 of the discharging vehicle 1 to control the on-off of the charging path between the motor controller 13 and the electric energy output port 19.

The engine 10, the generator 12, and the motor controller 13 are all existing components in the electric discharge vehicle 1. In the different operation modes, the engine 10 can directly output power to drive the discharging vehicle 1 to run. The engine 10 may also drive the generator 12 to generate power, and the electric energy generated by the generator 12 may partially drive a driving motor in the discharging vehicle 1 to run, or may be stored in the power battery 16. In the present embodiment, when the discharging vehicle 1 needs to charge another vehicle to be charged, the electric energy output from the generator 12 is output to the vehicle to be charged 2 through conversion by the motor controller 13.

In the conventional use of the engine 10, the motor controller 13 is used for inverting the direct-current high-voltage power input by the power battery 16 into three-phase alternating current with adjustable frequency, and supplying the three-phase alternating current to a matched driving motor. Illustratively, the motor controller 13 mainly includes an interface circuit, a control main board, an IGBT module, a housing, and a cooling water channel.

In the present embodiment, the ac power generated by the generator 12 can be converted into dc power by integrating the power conversion module 131 based on the existing motor controller 13 in the discharge vehicle 1. The electric energy conversion module 131 includes at least an AC-DC conversion circuit, and may further include a step-down or step-up circuit so that the motor controller 13 emits power or voltage required by the vehicle 2 to be charged under the control of the vehicle controller 11.

According to the scheme, the electric energy conversion module 131 is integrated in the motor controller 13, so that the existing engine 10 and the generator 12 in the discharging vehicle 1 can be utilized for generating electricity, the generated alternating current electric energy is converted into the direct current electric energy which can be received by the vehicle 2 to be charged, and the charging of the vehicle 2 to be charged is realized. Therefore, the discharging vehicle 1 does not need to be additionally provided with a V2V charger by the scheme, and the charging convenience is effectively improved. In addition, the discharging vehicle 1 of the present application utilizes the advantages of the existing engine 10, generator 12, and motor controller 13, and utilizes the existing communication interaction function in the discharging vehicle 1 to realize charging of other vehicles, so as to effectively reduce the production cost on the premise that the discharging vehicle 1 is configured with the charging function.

In the present embodiment, the motor controller 13 may be controlled by a Vehicle controller 11 (Vehicle Control Unit). Under the control of the vehicle controller 11, the electric energy conversion module 131 of the motor controller 13 converts the ac electric energy input from the generator 12 into a certain dc electric energy.

The first discharge control circuit is used for controlling the on-off of an electric energy transmission path between the output end of the motor controller 13 and an electric energy output port 19 of the discharging vehicle 1. In one embodiment, it should be appreciated that the transmission path of the electrical energy is a loop, with the output of the motor controller 13 having a positive pole and a negative pole. The current flows out from the positive pole of the output end and returns from the negative pole of the output end. The first discharge control circuit includes a first always positive switch 171, a first always negative switch 172; the first total positive switch 171 is connected between the positive pole of the output terminal of the motor controller 13 and the positive pole of the power outlet 19; the first overall negative switch 172 is connected between the negative pole of the output of the motor controller 13 and the negative pole of the power outlet 19. Here, the first total positive switch 171 and the first total negative switch 172 may be relays and controlled by the vehicle controller 11 or the Battery Management System 15 (BMS) of the discharging vehicle 1. The first total positive switch 171 is arranged on the positive pole of the output end of the motor controller 13, and the first total negative switch 172 is arranged on the negative pole of the output end, so that the safety and reliability of the output electric energy of the motor controller 13 can be improved.

In order to prevent the charging current from being too large at the instant of direct power-up and causing impact on the electronic devices in the vehicle 2 to be charged, in one embodiment, the first discharge control circuit further includes a first pre-charge circuit, which includes a first pre-charge switch 173 and a first current-limiting device 174; the first pre-charge switch 173 is connected in series with the first current limiting device 174, and the first pre-charge switch 173 is connected in series with the first current limiting device 174 and then connected in parallel with the first summing switch 171. The first current limiting device 174 may be a current limiting resistor. The number of the current limiting resistors can be one or more, and the connection mode can be series connection. The first pre-charge switch 173 may be a relay, and is controlled by the vehicle controller 11 or the battery management system 15 of the discharging vehicle 1.

In the initial charging period, the first overall positive switch 171, the first overall negative switch 172, and the first pre-charge switch 173 may be all turned on, so that the dc power output by the motor controller 13 at least partially flows through the first current-limiting device 174, thereby achieving the effect of reducing the charging current. In the initial charging period, the first always positive switch 171 may be turned off, the first always negative switch 172 and the first pre-charge switch 173 may be turned on, so that all the dc power output by the motor controller 13 may flow through the first current limiting device 174, thereby reducing the charging current to the maximum extent.

In the above embodiment, the transmission path of energy is, in order, the engine 10, the generator 12, the motor controller 13, and the power battery 16 of the vehicle 2 to be charged. When the discharging vehicle 1 of the present application is a hybrid vehicle, a power battery 16 is also disposed in the discharging vehicle 1, and the power battery 16 is also used for providing electric energy for a driving motor of the discharging vehicle 1. The discharge system of the present application can also charge the vehicle 2 to be charged based on the electric energy output from the power battery 16.

Specifically, in an embodiment, the discharging system of the discharging vehicle 1 further includes a power battery 16 and a second discharging control circuit; the power battery 16 is connected in parallel to two ends of the motor controller 13, and a switch 176 is connected in series on a branch where the power battery 16 or the motor controller 13 is located; the second discharging circuit is connected between the output end of the power battery 16 and the electric energy output port 19 of the discharging vehicle 1 to control the on-off of the charging path between the power battery 16 and the electric energy output port 19.

The changeover switch 176 may be a relay, and is controlled by the discharging vehicle 1 vehicle controller 11 or the battery management system 15. In one example, the switch 176 is connected in series with the motor controller 13 and then connected in parallel to the two ends of the power battery 16. The vehicle controller 11 can select to charge the vehicle 2 to be charged by using the engine 10, the generator 12 and the motor controller 13 or charge the vehicle 2 to be charged by using the power battery 16 according to specific requirements.

The second discharge circuit is used to control the on/off of the charging path between the power battery 16 and the vehicle 2 to be charged. In one embodiment, the second discharge control circuit includes a second total positive switch 181, a second total negative switch 182; the second total positive switch 181 is connected between the positive pole of the power battery 16 and the positive pole of the electric energy output port 19; the second overall negative switch 182 is connected between the negative electrode of the power battery 16 and the negative electrode of the electric energy output port 19; the second discharge control circuit further comprises a second pre-charge circuit comprising a second pre-charge switch 183 and a second current limiting device 184; the second pre-charge switch 183 is connected in series with the second current limiting device 184, and the second pre-charge switch 183 is connected in series with the second current limiting device 184 in parallel with the second main positive switch 181.

Here, it should be understood that the power battery 16 has a positive pole and a negative pole, the second total positive switch 181 controls the electric power outflow path of the power battery 16, and the second total negative switch 182 is used for controlling the battery return path of the power battery 16. Therefore, the safety and reliability of the power battery 16 for outputting electric energy can be improved by connecting the second total positive switch 181 to the positive pole of the electric power battery 16 and connecting the second total negative switch 182 to the negative pole of the power battery 16. Here, the second total positive switch 181, the second total negative switch 182, and the second pre-charge switch 183 may all be relays, and are controlled by the vehicle controller 11 or the battery management system 15 of the discharging vehicle 1. The second current limiter may be a current limiting resistor. The number of the current limiting resistors can be one or more, and the connection mode can be series connection.

Further, it is also possible to provide that the discharging system of the discharging vehicle 1 further includes a charge control switch 175, and the charge control switch 175 is connected to a path between the positive electrode of the output terminal of the motor controller 13 and the second total positive switch 181, and is located in a path between the first total positive switch 171 and the second total positive switch 181. Therefore, the charging control switch 175 is connected to the first charging control circuit and the second charging control circuit at the same time, and only when the charging control switch 175 is turned on, the first charging control circuit and the second charging control circuit can be turned on, so that the probability of the false turn-on of the first charging control circuit and the second charging control circuit can be effectively reduced by setting the charging control switch 175.

Based on the above embodiments, it can be seen that when the power generation mode of the generator 12 is adopted in the present embodiment, in terms of switch control, it is necessary to close the transfer switch 176, open the second total positive switch 181, the second total negative switch 182, the second pre-charge relay, and the first total positive switch 171; the first pre-charge switch 173, the first negative relay, and the charge control switch 175 are closed, and the pre-charge is performed on the vehicle 2 to be charged first. After the pre-charging of the vehicle 2 to be charged is completed, the first pre-charging switch 173 is turned off, and simultaneously the first overall positive relay is turned on, so that the vehicle 2 to be charged continues to be charged.

When the scheme of the application adopts a battery power generation mode, the change-over switch and the second main positive switch 181 need to be disconnected in the aspect of switch control; and closing the second pre-charging switch 183, the charging control switch 175, the first total positive relay, the first total negative relay and the second total negative switch 182, and pre-charging the vehicle to be charged. After the pre-charging of the vehicle 2 to be charged is completed, the second pre-charging switch 183 is turned off, and meanwhile, the second overall positive relay is turned on, so that the vehicle 2 to be charged is continuously charged.

It should be noted that the first charge control circuit may be provided independently of the second charge control circuit. In the present application, however, the first always-positive switch 171 is connected in series in the path between the second always-positive switch 781 and the positive terminal of the power output port 19; the first overall negative switch 172 is connected in series with the second overall negative switch 182 on the path to the negative terminal of the power outlet 19. The power battery 16 is charged and discharged conventionally through the second charge control loop. Therefore, in the present embodiment, the first charge control circuit can be formed by adding the first total positive switch 171, the first total negative switch 172, and the first pre-charge switch 173 to the existing charge/discharge circuit of the power battery 16, so that the risks of cost increase and circuit instability caused by circuit improvement are effectively reduced.

The discharging vehicle 1 of the application is generally provided with a standard fast charging port or a standard slow charging port, when the vehicle 2 to be charged is charged, one end of the charging connecting device 3 is used for being connected with the standard fast charging port or the standard slow charging port of the discharging vehicle 1, and the other end of the charging connecting device 3 is connected with the standard slow charging port of the vehicle 2 to be charged. In communication, on the basis of the original national standard direct current charging protocol, the simulation charging pile message sending logic is added for the discharging vehicle 1, so that the battery management system 15 of the charging vehicle recognizes the discharging vehicle as a quick charging pile, the charging process can be controlled and managed based on the national standard direct current charging protocol, a new charging protocol does not need to be established again, and the software development cost is effectively reduced.

The application also provides a vehicle, which comprises a vehicle body and the vehicle discharging system arranged in the vehicle body, wherein the vehicle discharging system is provided with a power source; an electric energy output port 19 is arranged on the vehicle body, and the vehicle discharging system charges the vehicle 2 to be charged through the electric energy output port 19. Since the vehicle discharge system in the above embodiment is provided in the vehicle, all the beneficial effects of the vehicle discharge system are provided, and the detailed description is omitted here.

The application also provides a control method of the vehicle discharge system, which is applied to the vehicle discharge system in the embodiment; since the vehicle in the present application is used to discharge the vehicle to be charged 2 during charging, in the following embodiment, the vehicle of the present method is referred to as a discharging vehicle 1 to be distinguished from the vehicle to be charged 2. Specifically, the control method of the discharge system of the vehicle includes:

s41, identifying the type of the charging connection device 3 inserted into the power outlet 19 on the vehicle;

here, the charging connection device 3 has two ends, one end connected to the power output port 19 of the discharging vehicle 1 of the present application, and the other end connected to the charging port of the vehicle 2 to be charged. The discharging vehicle 1 of the present application is generally provided with a standard fast charging port or a standard slow charging port. The standard quick charging port or the standard slow charging port can be used as the electric energy output port 19, and a separate electric energy output port 19 can also be additionally arranged. When the charging connection device 3 is connected to the power outlet 19 of the discharging vehicle 1, the vehicle controller 11 of the discharging vehicle 1 recognizes the type of the tip inserted into the power outlet 19, and the type of the tip is classified into three types here: a fast charging gun, a slow charging gun and a discharging gun.

Further, the vehicle controller 11 may automatically enter the discharging process after recognizing that the gun head type is the quick-charging gun. In another example, after the gun head type is identified as the quick charging gun, a control instruction may be further issued by the user to control the discharging system of the discharging vehicle 1 to enter the discharging process. Specifically, a button or a screen touch interface may be arranged on a main console inside the discharging vehicle 1, and a user operates the button or the screen touch interface to confirm entering the discharging process on the premise that the discharging vehicle 1 has no abnormality in self-inspection.

S42, when the gun head type of the charging connecting device 3 is discharging robbery, sending charging device identity information to the vehicle 2 to be charged for the vehicle 2 to be charged to identify as a charging device;

the discharging vehicle 1 and the vehicle 2 to be charged are both provided with a battery management system 15, and the core function of the battery management system 15 is to collect data such as voltage, temperature, current, resistance and the like of a power battery 16 system, analyze the data state and the battery use environment, and monitor and control the charging and discharging process of the battery system. The main functions of the battery management system 15 include, by function, battery state analysis, battery safety protection, battery energy management, communication, and fault diagnosis, and the like.

In step S42, the battery management system 15 of the discharging vehicle 1 may add a simulation charging pile message sending logic based on the original national standard dc charging protocol, so that the battery management system 15 of the vehicle to be charged identifies the discharging vehicle as a fast charging pile, and further, the charging process may be managed and controlled based on the existing national standard dc charging protocol, a new charging protocol does not need to be re-established, and the software development cost is effectively reduced.

S43, the charging demand information of the vehicle 2 to be charged is acquired.

After the discharging vehicle 1 and the charging vehicle perform communication handshake, the vehicle to be charged 2 transmits its own charging demand information to the discharging vehicle 1. The charging demand information may in this case comprise the permitted charging power and/or the charging voltage of the vehicle 2 to be charged. The allowed charging power may be the maximum allowed charging power of the vehicle 2 to be charged or the most suitable charging power range of the vehicle 2 to be charged, and is not limited herein.

Illustratively, the battery management system 15 of the vehicle 2 to be charged identifies the SOC of its own battery pack and the battery temperature information, and calculates the allowable charging power or the appropriate charging power by looking up a table. Further, the battery management system 21 of the vehicle to be charged 2 communicates with the battery management system 15 of the discharging vehicle 1, so that the charge demand information of the vehicle to be charged 2 is transmitted to the battery management system 15 of the discharging vehicle 1. The battery management system 21 of the vehicle 2 to be charged may also communicate with the vehicle controller 11 of the discharging vehicle in a case where the communication protocol supports, thereby transmitting the charge demand information of the vehicle 2 to be charged to the vehicle controller 11 of the discharging vehicle 1.

And S44, controlling the output power of the vehicle discharging system based on the charging demand information of the vehicle 2 to be charged so as to output electric energy to the vehicle 2 to be charged.

The discharge system of the discharge vehicle 1 in the present embodiment has two kinds of discharge paths. Wherein the first discharge path is: the engine 10 of the discharging vehicle 1 drives the generator 12 to generate electricity, and the generated electricity is subjected to alternating current/direct current conversion by the motor controller 13, and then the vehicle 2 to be charged is charged through the first discharging control loop. The second discharge path is to charge the vehicle 2 to be charged by the power battery 16 of the discharging vehicle 1 through the second discharge control loop.

In one embodiment, based on the first discharge path, step S44 includes: the discharge vehicle 1 includes an engine 10, a motor, and a motor controller 13; the charge demand information of the vehicle to be charged 2 includes the allowable input charging power of the vehicle to be charged 2;

s44, controlling the output power of the vehicle discharging system based on the charging demand information of the vehicle 2 to be charged to output electric energy to the vehicle 2 to be charged, including:

s441, obtaining the energy allowed to be output by the engine 10 and the power allowed to be output by the generator 12;

s442, determining the charging power allowed to be output by the vehicle based on the energy allowed to be output by the engine 10 and the power allowed to be output by the generator 12;

s443, controlling the operations of the engine 10 and the generator 12 according to the smaller value between the allowable input charging power of the vehicle 2 to be charged and the allowable output power of the vehicle; and controls the first discharge control circuit to be turned on.

Here, please refer to the above embodiment of the vehicle discharging system for the working process of the engine 10, the motor and the motor controller 13, which will not be described herein again.

Specifically, in this embodiment, the battery management system 15 of the vehicle 2 to be charged obtains the charging power allowed to be input at this time by identifying the SOC and temperature information of the own battery 22, calculating by table lookup, and sends the relevant information to the battery management system 15 of the discharging vehicle 1, and sends a charging request to the vehicle controller 11 of the discharging vehicle 1. Of course, in the case where the communication protocol supports, the battery management system 15 of the vehicle to be charged 2 may also directly transmit the relevant information to the vehicle controller 11 of the discharge amount.

In step S442, the vehicle controller 11 is electrically connected to the engine 10 management system and the motor controller 13 for communication, so as to obtain the energy allowed to be output by the engine 10 from the engine 10 management system and obtain the power allowed to be output by the generator 12 from the motor controller 13. Thereby comprehensively determining the charging power allowed to be output by the discharging system.

The vehicle controller 11 further compares the charging power allowed to be input to the vehicle 2 to be charged with the charging power allowed to be output from the discharging vehicle 1, and takes the smaller value of the two as the target output power of the discharging system, so as to avoid the overload operation of the motor controller 13, the generator 12, or the engine 10.

Then, the vehicle controller 11 transmits the target output power to an engine management system 14 (engine management system) and the motor controller 13, the engine management system 14 controls the engine 10 to generate corresponding power at an optimum efficiency, the motor controller 13 controls the generator 12 to generate corresponding power, and the motor controller 13 itself performs dc conversion on the ac power output from the generator 12, thereby converting the ac power output from the generator 12 into dc power required by the battery management system 21 of the vehicle 2 to be charged. At the same time, the vehicle controller 11 controls the relevant relay in the first discharge control loop to open, so that the dc power output by the motor controller 13 is transmitted to the vehicle 2 to be charged.

Specifically, when the discharging vehicle 1 starts to charge the vehicle 2 to be charged, in the initial charging stage, the vehicle controller 11 or the battery management system 15 controls the first pre-charging switch 173 to be turned on, and opens the first total negative switch 172, and simultaneously closes the transfer switch 176, opens the second total positive switch 181, the second total negative switch 182, the second pre-charging switch 183, and the first total positive switch 171; causing the motor controller 13 to power the vehicle 2 to be charged through the first pre-charge circuit; after the initial charging period ends, the first precharge switch 173 is turned off, the first always-on switch 171 is turned on, and the other switch states are unchanged, so that the motor controller 13 supplies power to the vehicle 2 to be charged through the first always-on switch 171.

Along with the charging, when the SOC of the vehicle 2 to be charged reaches the upper limit of availability, the battery management system 21 of the vehicle 2 to be charged sends a relevant signal to the battery management system 15 of the discharging vehicle, and the battery management system 15 of the discharging vehicle sends a signal to turn off the relay switch in the first discharging control circuit, at this time, the console in the discharging vehicle prompts that the charging is completed (may be a display screen in the vehicle displays charging completion information).

A discharge scheme for the second discharge path. In one embodiment, the discharge system of the discharge vehicle 1 includes a power battery 16; the charge demand information of the vehicle to be charged 2 includes the allowable input charging power of the vehicle to be charged 2.

s445, acquiring the charging power allowed to be output by the power battery 16;

s445, controlling the power battery 16 to output electric energy according to the smaller value between the allowable input charging power of the vehicle 2 to be charged and the allowable output power of the power battery 16; and controls the second discharge control circuit to be turned on.

Specifically, the vehicle controller 11 and the battery management system 15 of the discharging vehicle 1 communicate with the battery management system 21 of the vehicle 2 to be charged; illustratively, the battery management system 15 of the vehicle 2 to be charged recognizes the SOC and temperature information of its own battery pack, calculates the charging power allowed to be input at that time by looking up a table, notifies the battery management system 15 of the discharging vehicle of the allowed input charging power, and sends a charging request to the discharging vehicle controller 11.

Further, the battery management system 15 of the discharge vehicle detects relevant parameters such as the SOC and the temperature of the in-vehicle power battery 16, and transmits the power that the power battery 16 allows to output to the vehicle controller 11. The vehicle controller 11 of the discharging vehicle 1 compares the allowed input charging power of the vehicle 2 to be charged with the allowed output power of the power battery 16, and takes the smaller value of the two as the target output power of the discharging system, and the vehicle controller 11 sends the target output power to the battery management system 15 in the vehicle, so that the battery management system 15 controls the power battery 16 to output corresponding power. At the same time, the vehicle controller 11 and the battery management system 15 control the relevant relays in the second discharge control loop to open, so that the dc power output by the power battery 16 is transmitted to the vehicle 2 to be charged.

Specifically, the second discharge control circuit includes a second total positive switch 181, a second total negative switch 182; the discharge system of the discharge vehicle 1 further includes a second precharge circuit; when the discharging vehicle 1 starts charging the vehicle 2 to be charged, the changeover switch may be turned off to ensure that the motor controller 13 does not output electric power to the outside. At the initial stage of charging, the vehicle controller 11 or the battery management system 15 of the discharging vehicle 1 controls the second discharge control circuit to be turned on.

Specifically, the vehicle controller 11 or the battery management system 15 turns off the changeover switch 176, the second main positive switch 181; the second pre-charge switch 183, the charge control switch 175, the first total positive switch 171, the first total negative switch 172, and the second total negative switch 182 are closed, and the pre-charge is performed on the vehicle 2 to be charged first. After the pre-charging of the vehicle 2 to be charged is completed, the second pre-charging switch 183 is opened, and simultaneously the second always-positive switch 181 is closed, so that the vehicle 2 to be charged continues to be charged.

As the charging proceeds, when the SOC of the vehicle 2 to be charged reaches the upper limit of availability, the battery management system 21 of the vehicle 2 to be charged sends a charge end request signal to the battery management system 15 of the discharging vehicle, and the battery management system 15 of the discharging vehicle 1 sends a control signal to turn off the relay switch in the second discharge control circuit, at which time the discharging vehicle internal console prompts the completion of the charging (may be a display screen in the vehicle to display charge completion information).

While the present application has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present application may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the metes and bounds of the claims, or equivalence of such metes and bounds are therefore intended to be embraced by the appended claims.

Claims

1. A discharge system of a vehicle, characterized by comprising:

the engine is used for driving the generator to generate electricity;

and the first discharge control circuit is connected between the output end of the motor controller and an electric energy output port of the vehicle so as to control the on-off of a charging path between the motor controller and the electric energy output port.

2. The discharge system of the vehicle according to claim 1, characterized in that the first discharge control circuit includes a first total positive switch, a first total negative switch;

the first main positive switch is connected between the positive pole of the output end of the motor controller and the positive pole of the electric energy output port; the first total negative switch is connected between the negative pole of the output end of the motor controller and the negative pole of the electric energy output port.

3. The discharge system of a vehicle of claim 2, wherein the first discharge control circuit further comprises a first pre-charge circuit comprising a first pre-charge switch and a first current limiting device;

4. The discharging system of a vehicle according to claim 2, characterized in that the discharging system of a vehicle further comprises a power battery and a second discharging control circuit;

the power battery is connected in parallel with two ends of the motor controller, and a branch where the power battery or the motor controller is located is connected in series with a change-over switch;

the second discharging circuit is connected between the output end of the power battery and an electric energy output port of the vehicle to control the on-off of a charging path between the power battery and the electric energy output port.

5. The discharge system of the vehicle according to claim 4, wherein the second discharge control circuit includes a second total positive switch, a second total negative switch;

the second total positive switch is connected between the positive pole of the power battery and the positive pole of the output end of the motor controller; the second total negative switch is connected between the negative electrode of the power battery and the negative electrode of the output end of the motor controller;

6. The discharging system of a vehicle according to claim 4, further comprising a charge control switch connected on a path between the positive pole of the motor controller output terminal and the second total positive switch and on a path between the first total positive switch and the second total positive switch.

7. The discharging system of a vehicle according to any one of claims 1 to 6, wherein the power outlet is a standard fast charging port or a standard slow charging port of the vehicle.

8. A vehicle characterized by comprising a vehicle body and a vehicle discharge system according to any one of claims 1 to 7 provided in the vehicle body; the vehicle body is provided with an electric energy output port, and the vehicle discharging system charges a vehicle to be charged through the electric energy output port.

9. A control method of a discharge system of a vehicle for the vehicle discharge system according to any one of claims 1 to 7; characterized in that the method comprises:

acquiring charging demand information of a vehicle to be charged;

10. The method of claim 9, wherein the vehicle discharge system comprises an engine, an electric motor, and a motor controller; the charging demand information of the vehicle to be charged comprises the allowable input charging power of the vehicle to be charged;

11. The method of claim 10, wherein the first discharge control circuit comprises a first always positive switch, a first always negative switch, a first pre-charge switch;

the controlling the first discharge control circuit to be turned on includes:

12. The method of claim 11, wherein the vehicle discharge system comprises a power battery; the charging demand information of the vehicle to be charged comprises charging power allowed to be input by the vehicle to be charged;

acquiring the charging power allowed to be output by the power battery;

13. The method of claim 12, wherein the second discharge control circuit comprises a second overall positive switch, a second overall negative switch, a second pre-charge switch;

the control second discharge control circuit switches on, including: