Parent-child vehicle energy sharing system, control method and parent-child vehicle system

Abstract

The present application provides a mother-and-child vehicle energy sharing system, a control method, and a mother-and-child vehicle system, which relate to the field of charging control technology. The mother-and-child vehicle energy sharing system includes: an energy transmission system, a mother vehicle power battery system, a mother vehicle fuel cell system, a mother vehicle electric drive system, a mother vehicle whole vehicle controller, a child vehicle power battery system, a child vehicle fuel cell system, and a child vehicle whole vehicle controller; the mother vehicle fuel cell system is electrically connected to the mother vehicle power battery system, and the mother vehicle fuel cell system and the mother vehicle power battery system are electrically connected to the mother vehicle electric drive system respectively to provide energy for the mother vehicle electric drive system; the child vehicle fuel cell system is electrically connected to the child vehicle power battery system to charge the child vehicle power battery system, and the energy transmission system is electrically connected to the mother vehicle power battery system, the mother vehicle electric drive system, and the child vehicle power battery system respectively to transmit energy between the mother vehicle and the child vehicle. The present application can combine fuel cells, power batteries, and mother-and-child vehicles for energy sharing.

Description

Technical Field

[0001] The present application relates to the field of charging control technology, and in particular to a parent-child vehicle energy sharing system, a control method, and a parent-child vehicle system. Background Art

[0002] A mother-and-child vehicle refers to a vehicle consisting of a mother vehicle and a child vehicle, which is mainly used for long-distance cargo transportation. When the vehicles are fully loaded, the two vehicles operate normally. When the vehicles are empty, the child vehicle is usually placed on the mother vehicle, which can save costs and improve efficiency.

[0003] With the development of fuel cell vehicles, there are more and more application scenarios for fuel cell vehicles. However, due to the limitation of fuel cell power, existing fuel cell vehicles have the problem of short driving range, which is not conducive to the promotion and application of fuel cell vehicles.

[0004] How to apply fuel cell technology to parent-child vehicles to achieve energy sharing, thereby improving the operational efficiency of parent-child vehicles and reducing operating costs, is a technical direction worthy of attention. Summary of the Invention

[0005] The purpose of this application is to address the deficiencies in the above-mentioned prior art and provide a mother-and-child car energy sharing system, a control method and a mother-and-child car system, so as to combine fuel cells, power batteries and mother-and-child cars for energy sharing, improve the operational efficiency of mother-and-child cars and reduce operating costs.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of the present application are as follows:

[0007] In a first aspect, an embodiment of the present application provides a parent-child vehicle energy sharing system, the parent-child vehicle energy sharing system comprising: an energy transmission system, a parent vehicle power battery system, a parent vehicle fuel cell system, a parent vehicle electric drive system, a parent vehicle controller, and a sub-vehicle power battery system, a sub-vehicle fuel cell system, and a sub-vehicle controller provided in a sub-vehicle;

[0008] The mother vehicle fuel cell system is electrically connected to the mother vehicle power battery system to charge the mother vehicle power battery system, and the mother vehicle fuel cell system and the mother vehicle power battery system are respectively electrically connected to the mother vehicle electric drive system to respectively provide energy for the mother vehicle electric drive system;

[0009] The sub-vehicle fuel cell system is electrically connected to the sub-vehicle power battery system to charge the sub-vehicle power battery system, and the energy transmission system is electrically connected to the mother vehicle power battery system, the mother vehicle electric drive system and the sub-vehicle power battery system respectively to perform energy transmission between the mother vehicle and the sub-vehicle;

[0010] The mother vehicle fuel cell system is communicatively connected to the mother vehicle power battery system, the mother vehicle power battery system is communicatively connected to the mother vehicle whole vehicle controller, the mother vehicle whole vehicle controller is communicatively connected to the mother vehicle electric drive system, the mother vehicle power battery system is also communicatively connected to the sub-vehicle power battery system through the energy transmission system, the sub-vehicle fuel cell system is communicatively connected to the sub-vehicle power battery system, and the sub-vehicle power battery system is also communicatively connected to the sub-vehicle whole vehicle controller.

[0011] Optionally, the parent-child vehicle energy sharing system further comprises: a parent vehicle control switch provided in the parent vehicle and a child vehicle control switch provided in the child vehicle;

[0012] The mother vehicle control switch is communicatively connected to the mother vehicle controller, and is used to send an energy sharing control signal to the mother vehicle controller;

[0013] The sub-vehicle control switch is communicatively connected to the sub-vehicle vehicle controller and is used to send an energy sharing control signal to the sub-vehicle vehicle controller.

[0014] In a second aspect, an embodiment of the present application further provides a parent-child vehicle energy sharing control method, which is applied to the parent-child vehicle energy sharing system as described in the first aspect, and the method includes:

[0015] Obtaining the power of the mother vehicle power battery system, the power of the sub-vehicle power battery system, and the required driving power of the mother vehicle electric drive system;

[0016] The mother vehicle and the sub-vehicle are controlled to perform energy transmission according to the power of the mother vehicle, the power of the sub-vehicle and the required driving power.

[0017] Optionally, controlling the mother vehicle and the sub-vehicle to perform energy transmission according to the power level of the mother vehicle, the power level of the sub-vehicle, and the required driving power includes:

[0018] If the power of the mother vehicle is less than that of the sub-vehicle, and the required driving power is less than the discharge power of the sub-vehicle power battery system, control the sub-vehicle power battery system to provide energy to the mother vehicle power battery system and the mother vehicle electric drive system;

[0019] If the power of the mother vehicle is less than that of the sub-vehicle, and the required driving power is greater than or equal to the discharge power of the sub-vehicle power battery system, the target fuel cell system is controlled to start, and the target fuel cell system is the mother vehicle fuel cell system or the sub-vehicle fuel cell system;

[0020] When the hydrogen pressure signal of the target fuel cell system is greater than the minimum pressure threshold, the target fuel cell system, the mother vehicle power battery system, the sub-vehicle power battery system and the mother vehicle electric drive system are controlled to transmit energy according to the required driving power, the discharge power of the mother vehicle power battery system, the discharge power of the sub-vehicle power battery system and the rated power of the target fuel cell system.

[0021] Optionally, if the target fuel cell system is a sub-vehicle fuel cell system, the method further includes:

[0022] If the sum of the discharge power of the mother vehicle power battery system, the discharge power of the sub-vehicle power battery system and the rated power of the sub-vehicle fuel cell system does not meet the required driving power, controlling the mother vehicle fuel cell system to start;

[0023] Controlling the fuel cell system of the mother vehicle and the fuel cell system of the sub-vehicle to provide energy for the electric drive system of the mother vehicle;

[0024] According to the relationship between the rated power of the mother vehicle fuel cell system and the rated power of the sub-vehicle fuel cell system and the required driving power, the mother vehicle fuel cell system and the sub-vehicle fuel cell system are controlled to charge the mother vehicle power battery system and the sub-vehicle power battery system, or the mother vehicle power battery system and the sub-vehicle power battery system are controlled to provide energy for the mother vehicle electric drive system.

[0025] Optionally, controlling the mother vehicle and the sub-vehicle to perform energy transmission according to the power level of the mother vehicle, the power level of the sub-vehicle, and the required driving power includes:

[0026] If the power of the mother vehicle is greater than or equal to the power of the sub-vehicle, and the required driving power is less than the discharge power of the mother vehicle power battery system, control the mother vehicle power battery system to provide energy to the sub-vehicle power battery system and the mother vehicle electric drive system;

[0027] If the power of the mother vehicle is greater than or equal to the power of the sub-vehicle, and the required driving power is greater than or equal to the discharge power of the mother vehicle power battery system, the target fuel cell system is controlled to start, and the target fuel cell system is the mother vehicle fuel cell system or the sub-vehicle fuel cell system;

[0028] When the hydrogen pressure signal of the target fuel cell system is greater than the minimum pressure threshold, the target fuel cell system, the mother vehicle power battery system, the sub-vehicle power battery system and the mother vehicle electric drive system are controlled to transmit energy according to the required driving power, the discharge power of the mother vehicle power battery system, the discharge power of the sub-vehicle power battery system and the rated power of the target fuel cell system.

[0029] Optionally, if the hydrogen pressure of the sub-vehicle fuel cell system is greater than the minimum pressure threshold, the target fuel cell system is the sub-vehicle fuel cell system;

[0030] If the hydrogen pressure of the fuel cell system of the sub-vehicle is less than or equal to the minimum pressure threshold, the target fuel cell system is the fuel cell system of the mother vehicle.

[0031] Optionally, the method further includes:

[0032] When the hydrogen pressure of the mother vehicle fuel cell system and the hydrogen pressure of the sub-vehicle fuel cell system are both less than or equal to the minimum pressure threshold, controlling the mother vehicle power battery system and the sub-vehicle power battery system to provide energy for the mother vehicle electric drive system;

[0033] Control the mother vehicle electric drive system to operate within a first power limit threshold.

[0034] Optionally, the method further includes:

[0035] If the power levels of the mother vehicle power battery system and the sub-vehicle power battery system are both lower than a preset power threshold, the mother vehicle electric drive system is controlled to operate within a second power limit threshold.

[0036] In a third aspect, an embodiment of the present application further provides a parent-child vehicle system, the parent-child vehicle system comprising: the parent-child vehicle energy sharing system according to any one of the first aspects, a parent vehicle, and a child vehicle; the parent vehicle power battery system, the parent vehicle fuel cell system, the parent vehicle electric drive system, and the parent vehicle whole vehicle controller in the parent-child vehicle energy sharing system are arranged on the parent vehicle, and the child vehicle power battery system, the child vehicle fuel cell system, and the child vehicle whole vehicle controller in the parent-child vehicle energy sharing system are arranged on the child vehicle;

[0037] The parent-child vehicle system adopts the parent-child vehicle energy sharing control method as described in any one of the second aspects to control the parent vehicle and the child vehicle to share energy.

[0038] The beneficial effects of this application are:

[0039] The energy sharing system, control method and parent-child vehicle system provided in the present application include a power battery system and a fuel cell system in both the parent vehicle and the child vehicle, so that the parent-child vehicle can share energy not only through power batteries, but also through fuel cells, realizing hybrid energy sharing of the parent-child vehicle, which not only solves the problem of short driving mileage of fuel cells, but also solves the problem of high operating costs of power batteries, thereby improving the operating efficiency and operating costs of the parent-child vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 The system architecture of the parent-child vehicle energy sharing system provided in the embodiment of the present application Figure 1 ;

[0042] Figure 2 The system architecture of the parent-child vehicle energy sharing system provided in the embodiment of the present application Figure 2 ;

[0043] Figure 3 Schematic diagram of the process of the parent-child vehicle energy sharing control method provided in the embodiment of the present application Figure 1 ;

[0044] Figure 4 Schematic diagram of the process of the parent-child vehicle energy sharing control method provided in the embodiment of the present application Figure 2 ;

[0045] Figure 5 Schematic diagram of the process of the parent-child vehicle energy sharing control method provided in the embodiment of the present application Figure 3 ;

[0046] Figure 6 Schematic diagram of the process of the parent-child vehicle energy sharing control method provided in the embodiment of the present application Figure 4 ;

[0047] Figure 7 This is an architectural diagram of the parent-child cart system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0049] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0050] In addition, the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0051] It should be noted that, in the absence of conflict, the features in the embodiments of this application can be combined with each other.

[0052] Figure 1 The system architecture of the parent-child vehicle energy sharing system provided in the embodiment of the present application Figure 1 ,like Figure 1 As shown, the energy sharing system of the parent vehicle and the sub-vehicle may include: an energy transmission system 10, a parent vehicle power battery system 21, a parent vehicle fuel cell system 22, a parent vehicle electric drive system 23 and a parent vehicle whole vehicle controller 24 arranged in the parent vehicle, and a sub-vehicle power battery system 31, a sub-vehicle fuel cell system 32 and a sub-vehicle whole vehicle controller 33 arranged in the sub-vehicle.

[0053] The mother vehicle fuel cell system 22 is electrically connected to the mother vehicle power battery system 21 to charge the mother vehicle power battery system 21. The mother vehicle fuel cell system 22 and the mother vehicle power battery system 21 are respectively electrically connected to the mother vehicle electric drive system 23 to provide energy for the mother vehicle electric drive system 23 respectively.

[0054] The sub-vehicle fuel cell system 32 is electrically connected to the sub-vehicle power battery system 31 to charge the sub-vehicle power battery system 31, and the energy transmission system 10 is electrically connected to the mother vehicle power battery system 21, the mother vehicle electric drive system 23 and the sub-vehicle power battery system 31 respectively to transmit energy between the mother vehicle and the sub-vehicle.

[0055] The mother vehicle fuel cell system 22 is communicatively connected to the mother vehicle power battery system 21, the mother vehicle power battery system 21 is communicatively connected to the mother vehicle whole vehicle controller 24, the mother vehicle whole vehicle controller 24 is communicatively connected to the mother vehicle electric drive system 23, the mother vehicle power battery system 21 is also communicatively connected to the sub-vehicle power battery system 31 through the energy transmission system 10, the sub-vehicle fuel cell system 32 is communicatively connected to the sub-vehicle power battery system 31, and the sub-vehicle power battery system 31 is also communicatively connected to the sub-vehicle whole vehicle controller 33.

[0056] In this embodiment, the mother vehicle power battery system 21 includes a battery management system (BMS) and a power battery. The power battery is an energy storage unit, and the battery management system is used to manage the charging and discharging of the power battery.

[0057] The mother vehicle fuel cell system 22 includes a fuel cell stack, a hydrogen supply system and a fuel cell control system. The hydrogen supply system is used to provide hydrogen, and the fuel cell stack is used to generate electricity through hydrogen-oxygen reaction.

[0058] The power batteries of the mother vehicle power battery system 21 are electrically connected to the fuel cell stack of the mother vehicle fuel cell system 22 through a power distribution circuit, so that the mother vehicle fuel cell system 22 can charge the power batteries of the mother vehicle power battery system 21 .

[0059] The mother vehicle electric drive system 23 is used to connect to the whole vehicle drive structure of the mother vehicle, and is used to convert electrical energy into mechanical energy for the movement of the whole vehicle drive structure to control the driving of the mother vehicle.

[0060] The mother vehicle fuel cell system 22 is communicatively connected to the mother vehicle power battery system 21, and the mother vehicle vehicle control unit (VCU) 24 is communicatively connected to the mother vehicle power battery system 21 and the mother vehicle electric drive system 23, and can obtain the mother vehicle power and discharge power of the mother vehicle power battery system 21, the hydrogen pressure and rated power of the mother vehicle fuel cell system 22, and the driving demand power of the mother vehicle electric drive system 23.

[0061] The structure of the sub-vehicle power battery system 31 is similar to that of the main vehicle power battery system 21 , and the structure of the sub-vehicle fuel cell system 32 is similar to that of the main vehicle fuel cell system 22 , which will not be described in detail here.

[0062] The sub-vehicle fuel cell system 32 is communicatively connected to the sub-vehicle power battery system 31, and the sub-vehicle whole vehicle controller 33 is communicatively connected to the sub-vehicle power battery system 31, and can obtain the sub-vehicle power, discharge power of the sub-vehicle power battery system 31, and the hydrogen pressure and rated power of the sub-vehicle fuel cell system 32.

[0063] The mother vehicle power battery system 21, the mother vehicle electric drive system 23 and the sub-vehicle power battery system 31 are electrically connected through the energy transmission system 10, so that the mother vehicle fuel cell system 22 and the mother vehicle power battery system 21 can charge the sub-vehicle power battery system 31, or the sub-vehicle fuel cell system 32 and the sub-vehicle power battery system 31 can charge the mother vehicle power battery system 21 and provide energy for the mother vehicle electric drive system 23.

[0064] The mother vehicle power battery system 21, the mother vehicle electric drive system 23 and the sub-vehicle power battery system 31 are communicatively connected through the energy transmission system 10, so that the mother vehicle whole vehicle controller 24 can obtain the sub-vehicle power level, discharge power, hydrogen pressure and rated power of the sub-vehicle power battery system 31, or the sub-vehicle whole vehicle controller 33 can obtain the mother vehicle power level, discharge power, hydrogen pressure and rated power of the mother vehicle fuel cell system 22, and the driving demand power of the mother vehicle electric drive system 23.

[0065] The energy transmission system 10 can be a device with a bidirectional charging gun and a gun line, or it can be a wiring harness device with a bidirectional plug. The device has the functions of energy transmission and control signal transmission, and can transmit electric energy and interact with control signals between the mother vehicle and the child vehicle.

[0066] Either the mother vehicle controller 24 or the sub-vehicle controller 33 controls the charging and discharging between the corresponding battery systems according to the various parameters obtained, and provides energy for the mother vehicle electric drive system 23, thereby realizing energy sharing between the mother vehicle and the sub-vehicle.

[0067] It should be noted that the sub-vehicle also has a sub-vehicle electric drive system. When the sub-vehicle is traveling independently, the sub-vehicle power battery system 31 and the sub-vehicle fuel cell system 32 can provide energy for the sub-vehicle electric drive system. This solution takes into account the situation where the sub-vehicle is placed on the mother vehicle when the sub-vehicle is running unloaded, and the mother vehicle carries the sub-vehicle for travel. Therefore, the sub-vehicle electric drive system of the sub-vehicle is not shown in the figure.

[0068] The energy sharing system of the parent-child vehicle provided in the above embodiment includes a power battery system and a fuel cell system in both the parent vehicle and the child vehicle, so that the parent-child vehicle can share energy not only through power batteries, but also through fuel cells, realizing hybrid energy sharing of the parent-child vehicle, which not only solves the problem of short driving mileage of fuel cells, but also solves the problem of high operating costs of power batteries, thereby improving the operating efficiency and operating costs of the parent-child vehicle.

[0069] In one possible implementation, Figure 2 The system architecture of the parent-child vehicle energy sharing system provided in the embodiment of the present application Figure 2 ,like Figure 2 As shown, the parent-child vehicle energy sharing system may further include: a parent vehicle control switch 25 provided in the parent vehicle and a child vehicle control switch 34 provided in the child vehicle.

[0070] The mother vehicle control switch 25 is communicatively connected to the mother vehicle controller 24 for sending an energy sharing control signal to the mother vehicle controller 24 ; the sub-vehicle control switch 34 is communicatively connected to the sub-vehicle controller 33 for sending an energy sharing control signal to the sub-vehicle controller 33 .

[0071] In this embodiment, after receiving the energy sharing control signal sent by the mother vehicle control switch 25, the mother vehicle controller 24 controls the energy transmission path between the energy transmission system 10 and the mother vehicle power battery system 21 and the mother vehicle electric drive system 23 to be connected; similarly, after receiving the energy sharing control signal sent by the sub-vehicle control switch 34, the sub-vehicle controller 33 controls the energy transmission path between the energy transmission system 10 and the sub-vehicle power battery system 31 to be connected, so as to enable energy transmission between the mother vehicle and the sub-vehicle.

[0072] In some embodiments, as Figure 2 As shown, the mother vehicle is also provided with a mother vehicle instrument 26, which is communicatively connected to the mother vehicle power battery system 21 to obtain and display the mother vehicle power of the mother vehicle power battery system 21, the hydrogen pressure of the mother vehicle fuel cell system 22, the sub-vehicle power of the sub-vehicle power battery system 31, and the hydrogen pressure of the sub-vehicle fuel cell system 32.

[0073] The mother vehicle instrument 26 is also connected to the mother vehicle controller 24 for communication, and obtains and displays the alarm information sent by the mother vehicle controller 24.

[0074] The sub-vehicle is also provided with a sub-vehicle instrument 35, which is communicated with the sub-vehicle power battery system 31 to obtain and display the mother vehicle power of the mother vehicle power battery system 21, the hydrogen pressure of the mother vehicle fuel cell system 22, the sub-vehicle power of the sub-vehicle power battery system 31, and the hydrogen pressure of the sub-vehicle fuel cell system 32.

[0075] The sub-vehicle instrument 35 is also connected to the sub-vehicle vehicle controller 33 for communication, and obtains and displays the warning information sent by the sub-vehicle vehicle controller 33.

[0076] In some embodiments, as Figure 2 As shown, a mother vehicle gateway 27 is also provided in the mother vehicle, and a sub-vehicle gateway 36 is also provided in the sub-vehicle. The mother vehicle gateway 27 is communicated with the mother vehicle whole vehicle controller 24, and the sub-vehicle gateway 36 is communicated with the sub-vehicle whole vehicle controller 33. The mother vehicle gateway 27 and the sub-vehicle gateway 36 are responsible for protocol conversion between the mother vehicle and the sub-vehicle, as well as protocol conversion between different systems to ensure data interoperability.

[0077] The energy sharing system of the parent-child vehicle provided in the above embodiment controls whether energy sharing is performed between the parent-child vehicle through the parent-child vehicle control switch and the child-child vehicle control switch. When the parent-child vehicle and the child-child vehicle are driving independently, energy sharing is controlled not to be performed between the parent-child vehicle. When the child-child vehicle is placed on the parent-child vehicle, energy sharing is controlled between the parent-child vehicle, thereby realizing flexible control of energy sharing between the parent-child vehicle according to the driving conditions of the parent-child vehicle and the child-child vehicle.

[0078] In one possible implementation, an embodiment of the present application provides a parent-child vehicle energy sharing control method applied to a parent-child vehicle energy sharing system. The execution subject of the parent-child vehicle energy sharing control method can be a parent vehicle whole vehicle controller or a child vehicle whole vehicle controller. Generally, since the child vehicle is placed on the parent vehicle, the parent vehicle whole vehicle controller is used as the execution subject. The following takes the parent vehicle whole vehicle controller as an example to illustrate the specific implementation method of the parent-child vehicle energy sharing control method provided in the embodiment of the present application.

[0079] In one possible implementation, Figure 3 Schematic diagram of the process of the parent-child vehicle energy sharing control method provided in the embodiment of the present application Figure 1 ,like Figure 3 As shown, the method may include:

[0080] S101. Obtain the power of the mother vehicle power battery system, the power of the sub-vehicle power battery system, and the required driving power of the mother vehicle electric drive system.

[0081] S102: Control the mother vehicle and the sub-vehicles to transfer energy according to the power of the mother vehicle, the power of the sub-vehicles, and the required driving power.

[0082] In this embodiment, the parent vehicle power level is the real-time remaining power level of the parent vehicle's power battery system, and the child vehicle power level is the real-time remaining power level of the child vehicle's power battery system. The child vehicle's power battery system transmits the child vehicle's power level to the parent vehicle's power battery system, and the parent vehicle's power battery system transmits the parent vehicle's power level and the child vehicle's power level to the parent vehicle's vehicle controller. Similarly, the parent vehicle's power battery system can also transmit the parent vehicle's power level to the child vehicle's power battery system, and the child vehicle's power battery system transmits the parent vehicle's power level and the child vehicle's power level to the child vehicle's vehicle controller. The process of transmitting the parameters of each system in the parent vehicle to the child vehicle's vehicle controller will not be described below.

[0083] The required driving power is the power required by the mother vehicle electric drive system to drive the various driving structures of the mother vehicle to move so that the mother vehicle can carry the sub-vehicles for driving. The mother vehicle electric drive system can send the required driving power to the mother vehicle controller.

[0084] The mother vehicle controller determines the power battery system that can be discharged based on the relationship between the power of the mother vehicle and the power of the sub-vehicle, and then determines whether the discharge power of the power battery system that can be discharged can meet the required driving power of the mother vehicle's electric drive system based on the relationship between the discharge power of the power battery system that can be discharged and the required driving power, thereby determining whether the fuel cell system needs to be started.

[0085] If the fuel cell system does not need to be started, the power battery system that can discharge discharges to another power battery system and provides energy to the mother vehicle electric drive system.

[0086] If the fuel cell system needs to be started, the mother vehicle fuel cell system and / or the sub-vehicle fuel cell system will be started, and the mother vehicle fuel cell system and / or the sub-vehicle fuel cell system will provide energy to the mother vehicle electric drive system. The mother vehicle power battery system and the sub-vehicle power battery system will participate in charging or discharging based on the power distribution situation.

[0087] The energy sharing control method of the parent-child vehicle provided in the above embodiment controls the energy transmission between the power battery system and the fuel cell system of the parent vehicle and the child vehicle based on the power level of the parent vehicle's power battery, the power level of the child vehicle's power battery system and the required driving power of the parent vehicle's electric drive system, thereby realizing hybrid energy sharing of the parent-child vehicle and improving the operating efficiency and operating cost of the parent-child vehicle.

[0088] In one possible implementation, Figure 4 Schematic diagram of the process of the parent-child vehicle energy sharing control method provided in the embodiment of the present application Figure 2 ,like Figure 4 As shown, the process of controlling the energy transmission between the mother vehicle and the child vehicle in S102 according to the power of the mother vehicle, the power of the child vehicle, and the required driving power may include:

[0089] S201: If the power of the mother vehicle is less than that of the sub-vehicle, and the required driving power is less than the discharge power of the sub-vehicle power battery system, control the sub-vehicle power battery system to provide energy to the mother vehicle power battery system and the mother vehicle electric drive system.

[0090] S202: If the power of the parent vehicle is less than that of the child vehicle, and the required driving power is greater than or equal to the discharge power of the child vehicle's power battery system, the target fuel cell system is controlled to start, and the target fuel cell system is the parent vehicle fuel cell system or the child vehicle fuel cell system.

[0091] S203. When the hydrogen pressure signal of the target fuel cell system is greater than the minimum pressure threshold, the target fuel cell system, the mother vehicle power battery system, the sub-vehicle power battery system and the mother vehicle electric drive system are controlled to transmit energy according to the required driving power, the discharge power of the mother vehicle power battery system, the discharge power of the sub-vehicle power battery system and the rated power of the target fuel cell system.

[0092] In this embodiment, if the power of the mother vehicle is less than that of the sub-vehicle, it can be determined whether the sub-vehicle power battery system can provide energy for the mother vehicle power battery system and the mother vehicle electric drive system.

[0093] In some embodiments, when the required driving power of the mother vehicle electric drive system is less than the discharge power of the sub-vehicle power battery system, it is determined that the discharge power of the sub-vehicle power battery system can meet the required driving power of the mother vehicle electric drive system, and the sub-vehicle power battery system is controlled to provide energy to the mother vehicle power battery system and the mother vehicle electric drive system respectively through the energy transmission system. On the one hand, the mother vehicle electric drive system can drive the mother vehicle to travel, and on the other hand, the mother vehicle power battery system is charged. At this time, the sub-vehicle provides energy to the mother vehicle in pure electric mode.

[0094] In other embodiments, when the required driving power of the mother vehicle electric drive system is greater than or equal to the discharge power of the sub-vehicle power battery system, it is determined that the discharge power of the sub-vehicle power battery system cannot meet the required driving power of the mother vehicle electric drive system. At this time, energy needs to be provided by the fuel cell system.

[0095] Specifically, when the required driving power of the mother vehicle electric drive system is greater than or equal to the discharge power of the child vehicle power battery system, the target fuel cell system is controlled to start.

[0096] The target fuel cell system can be the mother vehicle fuel cell system or the sub-vehicle fuel cell system. Generally, the hydrogen in the sub-vehicle fuel cell system is consumed first. When the sub-vehicle fuel cell system is available, the sub-vehicle fuel cell system is used first. When the sub-vehicle fuel cell system cannot be used, the mother vehicle fuel cell system is used.

[0097] For example, Table 1 shows some situations of energy transmission between the mother vehicle and the sub-vehicle. As shown in Table 1, if the power of the mother vehicle is less than that of the sub-vehicle, and the required driving power is greater than or equal to the discharge power of the sub-vehicle power battery system, the target fuel cell is started.

[0098] Table 1 Some situations of energy transmission between the mother vehicle and the child vehicle

[0099]

[0100] Among them, MCU1 represents the mother vehicle electric drive system, FCS1 represents the mother vehicle fuel cell system, FCS2 represents the sub-vehicle fuel cell system, BMS1 represents the mother vehicle power battery system, and BMS2 represents the sub-vehicle power battery system.

[0101] The following takes the target fuel cell system as the sub-vehicle fuel cell system as an example to illustrate the energy transmission process between the target fuel cell system, the mother vehicle power battery system, the sub-vehicle power battery system and the mother vehicle electric drive system under different circumstances.

[0102] In some embodiments, as shown in Table 1, after the sub-vehicle fuel cell system is started, it is determined whether the rated power of the sub-vehicle fuel cell system is greater than the sum of the required driving power of the mother vehicle electric drive system and the charging power of the mother vehicle power battery system, and is less than or equal to the sum of the required driving power of the mother vehicle electric drive system, the charging power of the mother vehicle power battery system and the charging power of the sub-vehicle power battery system. If so, it is determined that the energy provided by the sub-vehicle fuel cell system can at least meet the needs of the mother vehicle electric drive system and the mother vehicle power battery system, and can also partially meet the needs of the sub-vehicle power battery system. Therefore, the sub-vehicle fuel cell system can be controlled to provide energy for the mother vehicle electric drive system and charge the mother vehicle power battery system and the sub-vehicle power battery system.

[0103] In other embodiments, as shown in Table 1, after the sub-vehicle fuel cell system is started, it is determined whether the rated power of the sub-vehicle fuel cell system is greater than the required driving power of the mother vehicle electric drive system, and is less than or equal to the sum of the required driving power of the mother vehicle electric drive system and the charging power of the mother vehicle power battery system. If so, it is determined that the energy provided by the sub-vehicle fuel cell system can at least meet the needs of the mother vehicle electric drive system and can also partially meet the needs of the mother vehicle power battery system. Therefore, the sub-vehicle fuel cell system can be controlled to provide energy for the mother vehicle electric drive system and charge the mother vehicle power battery system.

[0104] In other embodiments, as shown in Table 1, after the sub-vehicle fuel cell system is started, it is determined whether the required driving power of the mother vehicle electric drive system is greater than the rated power of the sub-vehicle fuel cell system, and is less than or equal to the sum of the rated power of the sub-vehicle fuel cell system and the discharge power of the sub-vehicle power battery system. If so, it is difficult to use the sub-vehicle fuel cell system alone to provide energy for the mother vehicle electric drive system, and it is necessary to use the sub-vehicle fuel cell system and the sub-vehicle power battery system to jointly provide energy for the mother vehicle electric drive system.

[0105] In other embodiments, as shown in Table 1, after the sub-vehicle fuel cell system is started, it is determined whether the required driving power of the mother vehicle electric drive system is greater than the sum of the rated power of the sub-vehicle fuel cell system and the discharge power of the sub-vehicle power battery system, and is less than or equal to the sum of the rated power of the sub-vehicle fuel cell system, the discharge power of the mother vehicle power battery system and the discharge power of the sub-vehicle power battery system. If so, it is difficult to use the sub-vehicle fuel cell system and the sub-vehicle power battery system alone to provide energy for the mother vehicle electric drive system, and it is necessary to use the sub-vehicle fuel cell system, the mother vehicle power battery system and the sub-vehicle power battery system to jointly provide energy for the mother vehicle electric drive system.

[0106] The energy sharing control method for the parent-child vehicle provided in the above embodiment determines that, when the power level of the parent vehicle is less than that of the child vehicle, the child vehicle's power battery system provides energy for the parent vehicle, or the target fuel cell system provides energy for the parent vehicle based on the required driving power of the parent vehicle's electric drive system, thereby realizing hybrid energy sharing between the parent-child vehicle's power battery and fuel cell, which not only solves the problem of short fuel cell driving mileage, but also solves the problem of high power battery operating cost, thereby improving the operating efficiency and operating cost of the parent-child vehicle.

[0107] In one possible implementation, if the target fuel cell system is a sub-vehicle fuel cell system, Figure 5 Schematic diagram of the process of the parent-child vehicle energy sharing control method provided in the embodiment of the present application Figure 3 ,like Figure 5 As shown, the method may further include:

[0108] S301: If the sum of the discharge power of the parent vehicle power battery system, the discharge power of the sub-vehicle power battery system, and the rated power of the sub-vehicle fuel cell system does not meet the required driving power, control the parent vehicle fuel cell system to start.

[0109] S302: Control the fuel cell system of the mother vehicle and the fuel cell system of the sub-vehicle to provide energy for the electric drive system of the mother vehicle.

[0110] S303. Based on the relationship between the rated power of the mother vehicle fuel cell system and the rated power of the sub-vehicle fuel cell system and the required driving power, control the mother vehicle fuel cell system and the sub-vehicle fuel cell system to charge the mother vehicle power battery system and the sub-vehicle power battery system, or control the mother vehicle power battery system and the sub-vehicle power battery system to provide energy for the mother vehicle electric drive system.

[0111] In this embodiment, as shown in Table 1, since the parent-child vehicle energy sharing system gives priority to the child vehicle fuel cell system, when the sum of the discharge power of the parent vehicle power battery system, the discharge power of the child vehicle power battery system and the rated power of the child vehicle fuel cell system does not meet the required driving power of the parent vehicle electric drive system, the parent vehicle fuel cell system needs to be added.

[0112] After the mother vehicle fuel cell system is started, the mother vehicle fuel cell system and the sub-vehicle fuel cell system provide energy to the mother vehicle electric drive system at rated power.

[0113] If the sum of the rated power of the mother vehicle fuel cell system and the rated power of the sub-vehicle fuel cell system is greater than the required driving power of the mother vehicle electric drive system, the mother vehicle fuel cell system and the sub-vehicle fuel cell system can also charge the mother vehicle power battery system and the sub-vehicle power battery system. Among them, the mother vehicle power battery system and the sub-vehicle power battery system can be balanced charged, or the mother vehicle power battery system can be powered first, and the sub-vehicle power battery system can be charged when there is surplus power.

[0114] When the sum of the rated power of the mother vehicle fuel cell system and the rated power of the sub-vehicle fuel cell system is less than the required driving power of the mother vehicle electric drive system, the mother vehicle fuel cell system and the sub-vehicle fuel cell system cannot meet the mother vehicle electric drive system, and the mother vehicle power battery system and the sub-vehicle power battery system need to be added to power the mother vehicle electric drive system.

[0115] Among them, the power battery system of the sub-vehicle can be used first to power the electric drive system of the mother vehicle, and then the power battery system of the mother vehicle can be used to power the electric drive system of the mother vehicle.

[0116] The above-mentioned embodiment provides a method for controlling the energy sharing between the mother and child vehicles. When the mother vehicle power battery system, the child vehicle power battery system and the child vehicle fuel cell system cannot meet the required driving power of the mother vehicle electric drive system, the mother vehicle fuel cell system is started, and the child vehicle fuel cell system and the mother vehicle fuel cell system jointly provide energy for the mother vehicle electric drive system. In addition, the mother vehicle power battery system and the child vehicle power battery system provide energy or charge according to the power distribution situation. This not only ensures that the mother vehicle electric drive system drives the mother vehicle to travel normally, but also avoids energy waste.

[0117] In one possible implementation, Figure 6 Schematic diagram of the process of the parent-child vehicle energy sharing control method provided in the embodiment of the present application Figure 4 ,like Figure 6 As shown, the process of controlling the energy transmission between the mother vehicle and the child vehicle in S102 according to the power of the mother vehicle, the power of the child vehicle, and the required driving power may include:

[0118] S401: If the power of the mother vehicle is greater than or equal to the power of the sub-vehicle, and the required driving power is less than the discharge power of the mother vehicle power battery system, control the mother vehicle power battery system to provide energy to the sub-vehicle power battery system and the mother vehicle electric drive system.

[0119] S402: If the power of the parent vehicle is greater than or equal to the power of the child vehicle, and the required driving power is greater than or equal to the discharge power of the parent vehicle's power battery system, the target fuel cell system is controlled to start. The target fuel cell system is the parent vehicle fuel cell system or the child vehicle fuel cell system.

[0120] S403. When the hydrogen pressure signal of the target fuel cell system is greater than the minimum pressure threshold, the target fuel cell system, the mother vehicle power battery system, the sub-vehicle power battery system and the mother vehicle electric drive system are controlled to transmit energy according to the required driving power, the discharge power of the mother vehicle power battery system, the discharge power of the sub-vehicle power battery system and the rated power of the target fuel cell system.

[0121] In this embodiment, if the power of the mother vehicle is greater than or equal to the power of the sub-vehicle, it can be determined whether the mother vehicle power battery system can provide energy for the mother vehicle electric drive system and the sub-vehicle power battery system.

[0122] In some embodiments, when the required driving power of the mother vehicle electric drive is less than the discharge power of the mother vehicle power battery system, it is determined that the discharge power of the mother vehicle power battery system can meet the required driving power of the mother vehicle electric drive system, and the mother vehicle power battery system is controlled to provide energy to the mother vehicle electric drive system, and to provide energy to the sub-vehicle power battery system through the energy transmission system, so that the mother vehicle electric drive system can drive the mother vehicle to travel on the one hand, and charge the sub-vehicle power battery system on the other hand.

[0123] In other embodiments, when the required driving power of the mother vehicle electric drive system is greater than or equal to the discharge power of the mother vehicle power battery system, it is determined that the discharge power of the mother vehicle power battery system cannot meet the required driving power of the mother vehicle electric drive system. At this time, energy is required from the fuel cell system.

[0124] Specifically, when the required driving power of the mother vehicle electric drive system is greater than or equal to the discharge power of the mother vehicle power battery system, the target fuel cell system is controlled to start.

[0125] For example, Table 2 shows other situations in which the mother vehicle and the child vehicle perform energy transmission. As shown in Table 2, if the power of the mother vehicle is greater than or equal to the power of the child vehicle, and the required driving power is greater than or equal to the discharge power of the target power battery system, the target fuel cell is started.

[0126] Table 2 shows other situations of energy transmission between the mother vehicle and the child vehicle.

[0127]

[0128] The following takes the target fuel cell system as the sub-vehicle fuel cell system as an example to illustrate the energy transmission process between the target fuel cell system, the mother vehicle power battery system, the sub-vehicle power battery system and the mother vehicle electric drive system under different circumstances.

[0129] In some embodiments, as shown in Table 2, after the sub-vehicle fuel cell system is started, it is determined whether the rated power of the sub-vehicle fuel cell system is greater than the sum of the required driving power of the mother vehicle electric drive system and the charging power of the sub-vehicle power battery system, and is less than or equal to the sum of the required driving power of the mother vehicle electric drive system, the charging power of the mother vehicle power battery system and the charging power of the sub-vehicle power battery system. If so, it is determined that the energy provided by the sub-vehicle fuel cell system can at least meet the needs of the mother vehicle electric drive system and the sub-vehicle power battery system, and can also partially meet the needs of the mother vehicle power battery system. Therefore, the sub-vehicle fuel cell system can be controlled to provide energy for the mother vehicle electric drive system and charge the mother vehicle power battery system and the sub-vehicle power battery system.

[0130] In other embodiments, as shown in Table 2, after the sub-vehicle fuel cell system is started, it is determined whether the rated power of the sub-vehicle fuel cell system is greater than the required driving power of the mother vehicle electric drive system, and is less than or equal to the sum of the required driving power of the mother vehicle electric drive system and the charging power of the sub-vehicle power battery system. If so, it is determined that the energy provided by the sub-vehicle fuel cell system can at least meet the needs of the mother vehicle electric drive system and can also partially meet the needs of the sub-vehicle power battery system. Therefore, the sub-vehicle fuel cell system can be controlled to provide energy for the mother vehicle electric drive system and charge the sub-vehicle power battery system.

[0131] In other embodiments, as shown in Table 2, after the sub-vehicle fuel cell system is started, it is determined whether the required driving power of the mother vehicle electric drive system is greater than the rated power of the sub-vehicle fuel cell system, and is less than or equal to the sum of the rated power of the sub-vehicle fuel cell system and the discharge power of the mother vehicle power battery system. If so, it is difficult to use the sub-vehicle fuel cell system alone to provide energy for the mother vehicle electric drive system, and it is necessary to use the sub-vehicle fuel cell system and the mother vehicle power battery system to jointly provide energy for the mother vehicle electric drive system.

[0132] In other embodiments, as shown in Table 2, after the sub-vehicle fuel cell system is started, it is determined whether the required driving power of the mother vehicle electric drive system is greater than the sum of the rated power of the sub-vehicle fuel cell system and the discharge power of the mother vehicle power battery system, and is less than or equal to the sum of the rated power of the sub-vehicle fuel cell system, the discharge power of the mother vehicle power battery system and the discharge power of the sub-vehicle power battery system. If so, it is difficult to meet the energy needs of the mother vehicle electric drive system by using the sub-vehicle fuel cell system and the mother vehicle power battery system alone, and it is necessary to use the sub-vehicle fuel cell system, the mother vehicle power battery system and the sub-vehicle power battery system to jointly provide energy for the mother vehicle electric drive system.

[0133] It should be noted that in the above embodiments, during the operation of the sub-vehicle fuel cell system, the hydrogen pressure of the sub-vehicle fuel cell system must be ensured to be greater than the minimum pressure threshold; during the operation of the mother vehicle fuel cell system, the hydrogen pressure of the mother vehicle fuel cell system must be ensured to be greater than the minimum pressure threshold; during the operation of both the mother vehicle fuel cell system and the sub-vehicle fuel cell system, the hydrogen pressure of both the mother vehicle fuel cell system and the sub-vehicle fuel cell system must be ensured to be greater than the minimum pressure threshold.

[0134] The energy sharing control method for the parent-child vehicle provided in the above embodiment determines that, when the power of the parent vehicle is greater than or equal to the power of the child vehicle, the power battery system of the parent vehicle provides energy for the parent vehicle, or the fuel cell system of the target vehicle provides energy for the parent vehicle based on the required driving power of the parent vehicle's electric drive system. Depending on the actual driving conditions of the parent vehicle, the power battery and the fuel cell provide energy for the parent vehicle. This not only solves the problem of short driving mileage of fuel cells, but also solves the problem of high operating costs of power batteries, thereby improving the operating efficiency and operating costs of the parent-child vehicle.

[0135] In some embodiments, if the hydrogen pressure of the sub-vehicle fuel cell system is greater than the minimum pressure threshold, the target fuel cell system is the sub-vehicle fuel cell system; if the hydrogen pressure of the sub-vehicle fuel cell system is less than or equal to the minimum pressure threshold, the target fuel cell system is the mother vehicle fuel cell system.

[0136] In this embodiment, if the hydrogen pressure of the sub-vehicle fuel cell system is greater than the minimum pressure threshold, the sub-vehicle fuel cell system is used first, and the sub-vehicle fuel cell system participates in providing energy for all the above-mentioned mother vehicle electric drive systems, mother vehicle power battery systems and sub-vehicle power battery systems.

[0137] When the hydrogen pressure of the sub-vehicle fuel cell system is less than or equal to the minimum pressure threshold, the sub-vehicle fuel cell system shuts down and stops working, and the mother vehicle fuel cell system starts. When the sum of the discharge power of the mother vehicle power battery system, the discharge power of the sub-vehicle power battery system and the rated power of the mother vehicle fuel cell system does not meet the required driving power, the sub-vehicle fuel cell system can no longer be started as described in S301-S303 above.

[0138] The energy sharing control method for the parent-child vehicle provided in the above embodiment preferentially uses the fuel cell system of the child vehicle to provide energy. When the hydrogen in the fuel cell system of the child vehicle is insufficient, the fuel cell system of the parent vehicle is used to provide energy. This can reduce the driving pressure of the parent vehicle and save the energy provided by the power battery and fuel cell as much as possible.

[0139] In a possible implementation, the method may further include:

[0140] When the hydrogen pressure of the mother vehicle fuel cell system and the hydrogen pressure of the sub-vehicle fuel cell system are both less than or equal to the minimum pressure threshold, the mother vehicle power battery system and the sub-vehicle power battery system are controlled to provide energy for the mother vehicle electric drive system; the mother vehicle electric drive system is controlled to operate within the first power limit threshold.

[0141] In this embodiment, the sub-vehicle fuel cell system is preferentially used to provide energy for the mother vehicle electric drive system. When the hydrogen pressure of the sub-vehicle fuel cell system is less than or equal to the minimum pressure threshold, the mother vehicle fuel cell system is used to provide energy for the mother vehicle electric drive system.

[0142] When the hydrogen pressure of the mother vehicle fuel cell system and the hydrogen pressure of the sub-vehicle fuel cell system are both less than or equal to the minimum pressure threshold, the mother vehicle fuel cell system and the sub-vehicle fuel cell system are unable to provide energy for the mother vehicle electric drive system. At this time, only the mother vehicle power battery system and the sub-vehicle power battery system can be used to provide energy for the mother vehicle electric drive system.

[0143] In the process of using the mother vehicle power battery system and the sub-vehicle power battery system to provide energy for the mother vehicle electric drive system, in order to extend the driving time of the mother vehicle, the mother vehicle electric drive system can be operated at limited power so that the mother vehicle electric drive system is in an operating mode within the first power limit threshold.

[0144] In some embodiments, when the mother vehicle electric drive system is in an operating mode within a first power limit threshold, it is determined that the mother vehicle is in an unlimited torque operating mode.

[0145] In some embodiments, a power-limited operation prompt is given to the driver in the mother vehicle instrument panel to remind the driver to charge the power battery and add hydrogen to the fuel cell as soon as possible.

[0146] The above embodiment provides a method for controlling energy sharing between a mother vehicle and a child vehicle. When the hydrogen pressure of the mother vehicle fuel cell system and the hydrogen pressure of the child vehicle fuel cell system are both less than or equal to the minimum pressure threshold, the mother vehicle power battery system and the child vehicle power battery system are controlled to provide energy for the mother vehicle electric drive system, and the mother vehicle electric drive system is controlled to operate within the first power limit threshold, thereby extending the driving time of the mother vehicle.

[0147] In another possible implementation, the method may further include:

[0148] If the power levels of both the mother vehicle power battery system and the daughter vehicle power battery system are lower than a preset power threshold, the mother vehicle electric drive system is controlled to operate within a second power limit threshold.

[0149] In this embodiment, when the power levels of the mother vehicle power battery system and the sub-vehicle power battery system are both lower than the preset power threshold, in order to extend the driving time of the mother vehicle, the mother vehicle electric drive system can be power-limited, so that the mother vehicle electric drive system is in an operating mode within the second power limit threshold, and the second power limit threshold is less than the first power limit threshold.

[0150] In some embodiments, when the parent vehicle electric drive system is in an operating mode within a second power limit threshold, it is determined that the parent vehicle electric drive system is in an unlimited torque operating mode.

[0151] In some embodiments, a power-limited operation prompt is given to the driver in the mother vehicle instrument panel to prompt the driver to charge the power battery and add hydrogen to the fuel cell as soon as possible.

[0152] The above embodiment provides a method for controlling energy sharing between a mother vehicle and a child vehicle. If the power levels of both the mother vehicle's power battery system and the child vehicle's power battery system are lower than a preset power threshold, the mother vehicle's electric drive system is controlled to operate within a second power limit threshold, thereby extending the mother vehicle's driving time.

[0153] In a possible implementation, the present application also provides a parent-child vehicle system. Figure 7 The architecture diagram of the parent-child vehicle system provided in the embodiment of the present application is as follows: Figure 7 As shown, the parent-child vehicle system may include: a parent-child vehicle energy sharing system 100, a mother vehicle 200, and a child vehicle 300; the mother vehicle power battery system 21, the mother vehicle fuel cell system 22, the mother vehicle electric drive system 23, and the mother vehicle whole vehicle controller 24 in the parent-child vehicle energy sharing system 100 are arranged on the mother vehicle 200, and the child vehicle power battery system 31, the child vehicle fuel cell system 32, and the child vehicle whole vehicle controller 33 in the parent-child vehicle energy sharing system 100 are arranged on the child vehicle 300; the parent-child vehicle system adopts the above-mentioned parent-child vehicle energy sharing control method to control the mother vehicle 200 and the child vehicle 300 to share energy.

[0154] The above are only specific embodiments of the present application, but the scope of protection of this application is not limited to them. Any changes or substitutions that can be easily conceived by any person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A method for controlling energy sharing between a parent and child vehicle, characterized in that: The method comprises: Obtain the power of the mother vehicle's power battery system, the power of the sub-vehicle's power battery system, and the required driving power of the mother vehicle's electric drive system; Controlling the mother vehicle and the sub-vehicle to perform energy transmission according to the power of the mother vehicle, the power of the sub-vehicle and the required driving power; The controlling the mother vehicle and the sub-vehicle to perform energy transmission according to the power of the mother vehicle, the power of the sub-vehicle, and the required driving power includes: If the power level of the mother vehicle is less than that of the sub-vehicle, and the required driving power is greater than or equal to the discharge power of the sub-vehicle power battery system, or if the power level of the mother vehicle is greater than or equal to that of the sub-vehicle, and the required driving power is greater than or equal to the discharge power of the mother vehicle power battery system, the target fuel cell system is controlled to start, and the target fuel cell system is the mother vehicle fuel cell system or the sub-vehicle fuel cell system; In the case where the hydrogen pressure signal of the target fuel cell system is greater than the minimum pressure threshold, if the rated power of the target fuel cell system is greater than the sum of the required driving power of the mother vehicle electric drive system and the charging power of the mother vehicle power battery system, and is less than or equal to the sum of the required driving power of the mother vehicle electric drive system, the charging power of the mother vehicle power battery system and the charging power of the sub-vehicle power battery system, the target fuel cell system is controlled to provide energy for the mother vehicle electric drive system and charge the mother vehicle power battery system and the sub-vehicle power battery system; If the target fuel cell system is a sub-vehicle fuel cell system, the method further includes: If the sum of the discharge power of the mother vehicle power battery system, the discharge power of the sub-vehicle power battery system and the rated power of the sub-vehicle fuel cell system does not meet the required driving power, controlling the mother vehicle fuel cell system to start; Controlling the fuel cell system of the mother vehicle and the fuel cell system of the sub-vehicle to provide energy for the electric drive system of the mother vehicle; According to the relationship between the rated power of the mother vehicle fuel cell system and the rated power of the sub-vehicle fuel cell system and the required driving power, the mother vehicle fuel cell system and the sub-vehicle fuel cell system are controlled to charge the mother vehicle power battery system and the sub-vehicle power battery system, or the mother vehicle power battery system and the sub-vehicle power battery system are controlled to provide energy for the mother vehicle electric drive system.

2. The method according to claim 1, wherein The controlling the mother vehicle and the sub-vehicle to perform energy transmission according to the power of the mother vehicle, the power of the sub-vehicle, and the required driving power includes: If the power of the mother vehicle is less than that of the sub-vehicle, and the required driving power is less than the discharge power of the sub-vehicle power battery system, the sub-vehicle power battery system is controlled to provide energy for the mother vehicle power battery system and the mother vehicle electric drive system.

3. The method according to claim 1, wherein The controlling the mother vehicle and the sub-vehicle to perform energy transmission according to the power of the mother vehicle, the power of the sub-vehicle, and the required driving power includes: If the power of the mother vehicle is greater than or equal to the power of the sub-vehicle, and the required driving power is less than the discharge power of the mother vehicle power battery system, the mother vehicle power battery system is controlled to provide energy for the sub-vehicle power battery system and the mother vehicle electric drive system.

4. The method according to claim 1, wherein If the hydrogen pressure of the sub-vehicle fuel cell system is greater than the minimum pressure threshold, the target fuel cell system is the sub-vehicle fuel cell system; If the hydrogen pressure of the fuel cell system of the sub-vehicle is less than or equal to the minimum pressure threshold, the target fuel cell system is the fuel cell system of the mother vehicle.

5. The method according to claim 1, wherein The method further comprises: When the hydrogen pressure of the mother vehicle fuel cell system and the hydrogen pressure of the sub-vehicle fuel cell system are both less than or equal to the minimum pressure threshold, controlling the mother vehicle power battery system and the sub-vehicle power battery system to provide energy for the mother vehicle electric drive system; The mother vehicle electric drive system is controlled to operate within a first power limit threshold.

6. The method according to claim 5, wherein The method further comprises: If the power levels of the mother vehicle power battery system and the sub-vehicle power battery system are both lower than a preset power threshold, the mother vehicle electric drive system is controlled to operate within a second power limit threshold.

7. A parent-child vehicle system, characterized in that: The parent-child vehicle system includes: a parent-child vehicle energy sharing system, a parent vehicle, and a child vehicle; the parent vehicle power battery system, the parent vehicle fuel cell system, the parent vehicle electric drive system, and the parent vehicle whole vehicle controller in the parent-child vehicle energy sharing system are arranged on the parent vehicle, and the child vehicle power battery system, the child vehicle fuel cell system, and the child vehicle whole vehicle controller in the parent-child vehicle energy sharing system are arranged on the child vehicle; The parent-child vehicle system adopts the parent-child vehicle energy sharing control method as described in any one of claims 1 to 6 to control the energy sharing between the parent vehicle and the child vehicle.

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