A hybrid power system control method and system

Abstract

The present invention discloses a hybrid power system control method and system. The control method includes: in the driving preparation completion mode, the vehicle control unit determines the power demand, if the power demand exceeds the power capacity of the power battery, the fuel cell is started, if not, it operates in the pure electric mode; in the parking charging mode, the solar cell wakes up the vehicle control unit when it is available, the vehicle control unit sends a charging available information to the terminal, when the charging conditions are met, the vehicle control unit controls the relay to power on, and controls the solar cell to charge the power battery. The embodiment of the present invention provides power to the vehicle through the cooperation of solar cells and fuel cells, and when the vehicle is in the parking charging state, the solar cell control unit controls the solar cell to charge the power battery according to the power of the solar cell and the charge state of the power battery, thereby fully utilizing solar energy and battery power and improving power supply efficiency.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a hybrid power system control method and system. Background Art

[0002] As solar panels become more common on vehicles and their energy efficiency ratings improve, they are beginning to be used to power vehicles, and the energy converted by solar panels is also increasing the mileage of the vehicle.

[0003] Existing technical solutions usually apply solar energy to low-voltage accessories and mainly connect them in parallel with power batteries to power the entire vehicle. For example, solar power is stored in the car's battery to power the vehicle. The solar energy is then output to electrical appliances through the battery, which results in efficiency losses and prevents the full utilization of solar energy resources. Summary of the Invention

[0004] The present invention provides a hybrid power system control method and system to solve the problem that solar energy resources cannot be fully utilized and the power supply efficiency is low.

[0005] In order to achieve the above technical problems, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a hybrid power system control method, comprising:

[0007] The vehicle control unit, fuel cell, power battery, relay, solar cell, solar cell control unit and gateway; the power battery is connected to the first end of the relay, the fuel cell is connected to the second end of the relay; the second end of the relay is connected to the drive motor;

[0008] The control method includes:

[0009] In the driving preparation completion mode, the vehicle control unit determines the power demand based on the driving operation, and requests to start the fuel cell when the power demand exceeds the power capacity of the power battery. If the power demand does not exceed the power capacity of the power battery, the vehicle operates in the pure electric mode;

[0010] If the state of charge of the power battery is less than a first preset value and the status reported by the solar cell control unit is available, the vehicle control unit sends a request to the solar cell control unit to control the solar cell to output power to the drive motor or charge the power battery;

[0011] In the parking charging mode, the solar cell control unit wakes up the vehicle control unit when it detects that the solar cell is available, and the vehicle control unit sends a charging available information to the terminal. If a charging request sent by the terminal is received, when the charging conditions are met, the vehicle control unit controls the relay to power on, and at the same time controls the solar cell through the solar cell control unit to charge the power battery.

[0012] Optionally, the vehicle control unit determines a power demand based on a driving operation, and when the power demand exceeds the power capacity of the power battery, requests to start the fuel cell, including:

[0013] When the state of charge of the power battery is less than a second preset value, controlling the fuel cell to start;

[0014] The charging condition includes when the state of charge of the power battery is less than a third preset value; wherein, the third preset value is greater than the second preset value.

[0015] Optionally, the method further includes: when the state of charge of the power battery is greater than or equal to the third preset value, the vehicle control unit controls the fuel cell to shut down;

[0016] When the state of charge of the power battery is greater than the first preset value, the solar cell control unit controls the solar cell to stop working.

[0017] Optionally, necessary conditions for entering the parking charging mode include: no one in the vehicle, the vehicle is in a locked state, and the vehicle network is in a sleep mode.

[0018] Optionally, the charging conditions include at least one of the following: there is no high-voltage power-on prohibition fault, the hood is in a closed state, the vehicle door is in a closed state, the low-voltage power supply state is off, and the charge state of the power battery is less than the first preset value.

[0019] Optionally, the fuel cell includes a fuel cell stack, a first DC / DC and a fuel cell control unit; the second end of the relay is connected to the second DC / DC;

[0020] The vehicle control unit controls the relay to be powered on, and at the same time controls the solar cell to charge the power battery through the solar cell control unit, including:

[0021] The vehicle control unit controls the relay to be powered on, and controls the fuel cell control unit to enable the first DC / DC;

[0022] When the relay feedback relay is closed, the first DC / DC is in working state, and the second DC / DC is in working state, the vehicle control unit sends a working request to the solar cell control unit. When the feedback working state received from the solar cell control unit is in working state, the vehicle enters the parking charging mode.

[0023] Optionally, if at least one of the following conditions is met during the start-up charging process or the parking charging process, the parking charging power-off process is performed, and the vehicle control unit reports the charging stop to the terminal:

[0024] There is a fault high-voltage power-off request, the hood is open, the door is open, the low-voltage power supply is not in the off state; the first DC / DC feedback working state is not in the working state, the second DC / DC feedback working state is not in the working state, and the solar cell control unit working state is in the non-working state for more than a preset time;

[0025] The state of charge of the power battery is greater than the first preset value.

[0026] Optionally, the parking charging power-off process includes:

[0027] The vehicle control unit sends a stop operation request to the solar cell control unit, the vehicle control unit stops enabling the first DC / DC, stops enabling the second DC / DC, controls the relay to power off, and the vehicle network enters a sleep state.

[0028] In a second aspect, the present invention provides a hybrid power system, comprising:

[0029] A vehicle control unit, a fuel cell, a power battery, a relay, a solar cell, a solar cell control unit, and a gateway; the power battery is connected to a first end of the relay, the fuel cell is connected to a second end of the relay; the second end of the relay is connected to a drive motor; the solar cell control unit and the vehicle control unit are in communication with the gateway;

[0030] In the driving preparation completion mode, the vehicle control unit is configured to determine a power demand based on driving operation, and request to start the fuel cell when the power demand exceeds the power capacity of the power battery; if the power demand does not exceed the power capacity of the power battery, the vehicle operates in a pure electric mode;

[0031] The vehicle control unit is configured to send a request to the solar cell control unit to control the solar cell to output electric energy to the drive motor or charge the power battery when the state of charge of the power battery is less than a first preset value and the status reported by the solar cell control unit is available;

[0032] In the parking charging mode, the solar cell control unit is used to wake up the vehicle control unit when it detects that the solar cell is available. The vehicle control unit sends charging available information to the terminal. If a charging request sent by the terminal is received; when the charging conditions are met, the vehicle control unit is used to control the relay to power on, and at the same time control the solar cell to charge the power battery through the solar cell control unit.

[0033] Optionally, the fuel cell includes a fuel cell stack, a first DC / DC and a fuel cell control unit; a first end of the first DC / DC is connected to the solar cell and the fuel cell stack; a second end of the first DC / DC is connected to the second end of the relay;

[0034] The fuel cell control unit is communicatively connected to the vehicle control unit.

[0035] Optionally, the fuel cell includes a fuel cell stack, a first DC / DC and a fuel cell control unit; a first end of the first DC / DC is connected to the fuel cell stack; a second end of the first DC / DC is connected to the second end of the relay; and the solar cell is connected to the first end of the relay;

[0036] The fuel cell control unit is communicatively connected to the vehicle control unit.

[0037] The technical solution of the embodiment of the present invention provides power to the vehicle through the coordinated operation of solar cells and fuel cells. If the power demand of the vehicle exceeds the power capacity of the power battery, the fuel cell is started to power the vehicle together with the solar cells and the power battery. If the power demand of the vehicle does not exceed the power capacity of the power battery, the vehicle operates in a pure electric mode, that is, the vehicle is powered only by solar cells and the power battery. When the vehicle is in a parked charging state, the solar cell control unit can control the solar cell to charge the power battery according to the power of the solar cell and the charge state of the power battery, thereby fully utilizing solar energy and battery power and improving power supply efficiency.

[0038] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 A flow chart of a hybrid power system control method provided by an embodiment of the present invention;

[0041] Figure 2 A flowchart of another hybrid power system control method provided by an embodiment of the present invention;

[0042] Figure 3 A flow chart of another hybrid power system control method provided by an embodiment of the present invention;

[0043] Figure 4 A flow chart of another hybrid power system control method provided by an embodiment of the present invention;

[0044] Figure 5 A flow chart of another hybrid power system control method provided by an embodiment of the present invention;

[0045] Figure 6 A flow chart of another hybrid power system control method provided by an embodiment of the present invention;

[0046] Figure 7 A schematic structural diagram of a hybrid power system provided by an embodiment of the present invention;

[0047] Figure 8 A schematic structural diagram of another hybrid power system provided by an embodiment of the present invention;

[0048] Figure 9 A structural diagram of another hybrid power system provided by an embodiment of the present invention.

[0049] In the picture:

[0050] Vehicle control unit 1, fuel cell 2, fuel cell stack 21, first DC / DC 22, fuel cell control unit 23, power battery 3, relay 4, solar cell 5, solar cell control unit 6, gateway 7, drive motor 8, second DC / DC 9, terminal 10, and on-board remote communication terminal 11. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0052] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof 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.

[0053] An embodiment of the present invention provides a hybrid power system control method applicable to vehicles equipped with solar cells and fuel cells. The method is performed by a hybrid power system comprising a vehicle control unit 1, a fuel cell 2, a power battery 3, a relay 4, a solar cell 5, a solar cell control unit 6, and a gateway 7. The power battery 3 is connected to the first terminal of the relay 4, and the fuel cell 2 is connected to the second terminal of the relay 4. The second terminal of the relay 4 is connected to a drive motor 8.

[0054] Figure 1 A flow chart of a hybrid power system control method provided by an embodiment of the present invention is shown in FIG. Figure 1 , control methods include:

[0055] S101. In the driving preparation completion mode, the vehicle control unit determines the power demand based on the driving operation. When the power demand exceeds the power capacity of the power battery, it requests to start the fuel cell. If the power demand does not exceed the power capacity of the power battery, it operates in the pure electric mode.

[0056] Specifically, the driving preparation complete mode refers to the state in which the vehicle is ready to drive after high-voltage power-up via push-button start or keyless entry. Driving operations may include vehicle speed and accelerator pedal position. Torque demand is determined by table lookup and then converted into power demand based on the drive motor speed. If the power demand exceeds the power capacity of the power battery, the fuel cell is activated, and power is supplied by the power battery, solar cells, and fuel cell. If the power demand does not exceed the power capacity of the power battery, the vehicle operates in pure electric mode, with power supplied by the power battery and solar cells, or solely by the power battery.

[0057] S102: If the state of charge of the power battery is less than a first preset value and the solar cell control unit reports an available status, the vehicle control unit sends a request to the solar cell control unit to control the solar cell to output power to the drive motor or charge the power battery.

[0058] Specifically, the state of charge (SOC), also known as the remaining capacity, represents the ratio of the battery's remaining dischargeable capacity to its fully charged capacity. For example, a SOC of 0% indicates that the battery is fully discharged, and a SOC of 100% indicates that the battery is fully charged. The first preset value can be the upper limit of the power battery's charge, such as a SOC of 95%, 98%, etc. If the SOC is equal to 100%, it is easy to cause overcharging, which can cause damage such as deformation of the battery and shorten its service life. The solar cell control unit reports that the status is available, which can be the voltage of the solar cell reaching a voltage value capable of external output. When the power battery's SOC is less than the upper limit of the power battery's charge, and the voltage of the solar cell reaches a voltage value capable of external output, the vehicle control unit sends a request to the solar cell control unit to control the solar cell to output power to the drive motor or charge the power battery.

[0059] S103. In the parking charging mode, the solar cell control unit wakes up the vehicle control unit when it detects that the solar cell is available. The vehicle control unit sends a charging available information to the terminal. If a charging request sent by the terminal is received, the vehicle control unit controls the relay to power on when the charging conditions are met, and at the same time controls the solar cell through the solar cell control unit to charge the power battery.

[0060] Specifically, the necessary conditions for entering parking charging mode include: no occupants on board, the vehicle is locked, and the vehicle network is in sleep mode. Charging conditions include at least one of the following: no high-voltage power-on-disable faults, the hood is closed, the doors are closed, the low-voltage power supply is in the off state, and the power battery's state of charge is less than a first preset value. The hood refers to the engine hood. Faults that prohibit high-voltage power-on include, but are not limited to, excessive deviation in the state of charge of the power battery cells (i.e., excessive deviation in the state of charge between multiple cells within the battery system), an open relay circuit, a spring failure preventing engagement, or a spring failure to disengage after engagement. The low-voltage power supply being in the off state can include the vehicle being parked, such as in the OFF gear, meaning the vehicle power is not connected. During this time, the vehicle network is generally in sleep mode. In parking charging mode, the solar cell control unit wakes up the vehicle control unit when it detects that the solar cell voltage is capable of outputting external voltage. The vehicle control unit then sends a charging-ready message to the terminal. Upon receiving a charging request from the terminal and meeting the charging conditions, the vehicle control unit controls the relay to engage and energize, while simultaneously controlling the solar cell control unit to charge the power battery. The terminal can be a mobile phone APP, and the vehicle control unit can send information to the mobile phone APP through the on-board remote communication terminal.

[0061] The technical solution of the embodiment of the present invention provides power to the vehicle through the coordinated operation of solar cells and fuel cells. If the power demand of the vehicle exceeds the power capacity of the power battery, the fuel cell is started to power the vehicle together with the solar cells and the power battery. If the power demand of the vehicle does not exceed the power capacity of the power battery, the vehicle operates in a pure electric mode, that is, the vehicle is powered only by solar cells and the power battery. When the vehicle is in a parked charging state, the solar cell control unit can control the solar cell to charge the power battery according to the power of the solar cell and the charge state of the power battery, thereby fully utilizing solar energy and battery power and improving power supply efficiency.

[0062] Optionally, Figure 2 This is a flow chart of another hybrid power system control method provided by an embodiment of the present invention. Figure 2 , the hybrid power system control method provided in this embodiment includes:

[0063] S201. In the driving preparation completion mode, if the state of charge of the power battery is less than a first preset value and the solar cell control unit reports an available status, the vehicle control unit sends a request to the solar cell control unit to control the solar cell to output power to the drive motor or charge the power battery.

[0064] S202: When the state of charge of the power battery is less than a second preset value, control the fuel cell to start.

[0065] Specifically, the second preset value may be a threshold value of the state of charge of the power battery that enables the fuel cell to start. When the state of charge of the power battery is less than the second preset value, the vehicle control unit controls the fuel cell to start.

[0066] S203. The charging condition includes the state of charge of the power battery being less than a third preset value; wherein the third preset value is greater than the second preset value.

[0067] Specifically, the third preset value may be a state-of-charge threshold of the power battery that can shut down the fuel cell. When the state-of-charge of the power battery is less than the third preset value, the vehicle control unit controls the fuel cell to continue charging the power battery.

[0068] S204. In the parking charging mode, the solar cell control unit wakes up the vehicle control unit when it detects that the solar cell is available. The vehicle control unit sends a charging available information to the terminal. If a charging request sent by the terminal is received, the vehicle control unit controls the relay to power on when the charging conditions are met, and at the same time controls the solar cell through the solar cell control unit to charge the power battery.

[0069] Optionally, Figure 3 This is a flow chart of another hybrid power system control method provided by an embodiment of the present invention. Figure 3 , the hybrid power system control method provided in this embodiment includes:

[0070] S301. In the driving preparation completion mode, if the state of charge of the power battery is less than a first preset value and the solar cell control unit reports an available status, the vehicle control unit sends a request to the solar cell control unit to control the solar cell to output power to the drive motor or charge the power battery.

[0071] S302: When the state of charge of the power battery is less than a second preset value, control the fuel to start the engine.

[0072] S303: The charging condition includes the state of charge of the power battery being less than a third preset value; wherein the third preset value is greater than the second preset value.

[0073] S304: When the state of charge of the power battery is greater than or equal to a third preset value, the vehicle control unit controls the fuel cell to shut down.

[0074] Specifically, when the state of charge of the power battery is greater than or equal to a third preset value, that is, the state of charge of the power battery is greater than or equal to the threshold value of the state of charge of the power battery that causes the fuel cell to shut down, the vehicle control unit controls the fuel cell to shut down and stops charging the power battery.

[0075] S305: When the state of charge of the power battery is greater than a first preset value, the solar cell control unit controls the solar cell to stop working.

[0076] Specifically, when the state of charge of the power battery is greater than a first preset value, that is, when the state of charge of the power battery is greater than the charging upper limit, the solar cell control unit controls the solar cell to stop charging the power battery or outputting power to the drive motor.

[0077] S306. In the parking charging mode, the solar cell control unit wakes up the vehicle control unit when it detects that the solar cell is available. The vehicle control unit sends a charging available information to the terminal. If a charging request sent by the terminal is received, the vehicle control unit controls the relay to power on when the charging conditions are met, and at the same time controls the solar cell through the solar cell control unit to charge the power battery.

[0078] Optionally, Figure 4 This is a flow chart of another hybrid power system control method provided by an embodiment of the present invention. Figure 4 , the hybrid power system control method provided in this embodiment includes:

[0079] S401. In the driving preparation completion mode, if the state of charge of the power battery is less than a first preset value and the solar cell control unit reports an available status, the vehicle control unit sends a request to the solar cell control unit to control the solar cell to output power to the drive motor or charge the power battery.

[0080] S402: When the state of charge of the power battery is less than a second preset value, control the fuel cell to start.

[0081] Specifically, the fuel cell includes a fuel cell stack, a first DC / DC converter, and a fuel cell control unit. The fuel cell stack is used to generate electricity to charge the power battery. The first DC / DC converter can be a boost DC / DC converter that controls the solar cell and / or fuel cell to deliver energy to the power battery. The fuel cell control unit is used to control the operating status of the fuel cell stack and the first DC / DC converter.

[0082] S403: The charging condition includes the state of charge of the power battery being less than a third preset value; wherein the third preset value is greater than the second preset value.

[0083] S404: In the parking charging mode, the solar cell control unit wakes up the vehicle control unit when detecting that the solar cell is available, and the vehicle control unit sends a charging available information to the terminal.

[0084] S405: If a charging request is received from the terminal and the charging conditions are met, the vehicle control unit controls the relay to power on and controls the fuel cell control unit to enable the first DC / DC.

[0085] Specifically, the second end of the relay is connected to the second DC / DC, which can be a low-voltage power supply DC / DC, used to convert part of the energy in the power battery to power the battery, thereby preventing the battery from being seriously depleted. When in parking charging mode, many devices are still in operation to charge the power battery. At this time, the power in the battery will be consumed to maintain the operation of the devices, which can easily cause the battery to be depleted. The depletion of the battery will cause the vehicle to be unable to be activated. Therefore, the battery needs to be charged through the second DC / DC in parking charging mode. If a charging request sent by the terminal is received, when the charging conditions are met, the vehicle control unit controls the relay to be powered on, and at the same time, the vehicle control unit controls the fuel cell control unit to enable the first DC / DC to charge the power battery.

[0086] S406. When the relay feedback relay is closed, the first DC / DC is in working state, and the second DC / DC is in working state, the vehicle control unit sends a working request to the solar cell control unit. When the feedback working state received from the solar cell control unit is in working state, the vehicle enters the parking charging mode.

[0087] Specifically, when the relay feedback relay is closed, the first DC / DC is in working state, and the second DC / DC is in working state, the vehicle control unit sends a working request to the solar cell control unit, that is, requests the solar cell to charge the power battery. When the feedback working state of the solar cell control unit is received as working state, it means that the solar cell starts working to charge the power battery, and the parking charging mode is entered at this time.

[0088] Optionally, Figure 5 This is a flow chart of another hybrid power system control method provided by an embodiment of the present invention. Figure 5 , the hybrid power system control method provided in this embodiment includes:

[0089] S501. In the driving preparation completion mode, if the state of charge of the power battery is less than a first preset value and the solar cell control unit reports an available status, the vehicle control unit sends a request to the solar cell control unit to control the solar cell to output power to the drive motor or charge the power battery.

[0090] S502: When the state of charge of the power battery is less than a second preset value, control the fuel cell to start.

[0091] S503: The charging condition includes the state of charge of the power battery being less than a third preset value; wherein the third preset value is greater than the second preset value.

[0092] S504: In the parking charging mode, the solar cell control unit wakes up the vehicle control unit when detecting that the solar cell is available, and the vehicle control unit sends a charging available information to the terminal.

[0093] S505: If a charging request is received from the terminal and the charging conditions are met, the vehicle control unit controls the relay to power on and controls the fuel cell control unit to enable the first DC / DC.

[0094] S506. When the relay feedback relay is closed, the first DC / DC is in working state, and the second DC / DC is in working state, the vehicle control unit sends a working request to the solar cell control unit. When the feedback working state received from the solar cell control unit is in working state, the vehicle enters the parking charging mode.

[0095] S507: If at least one of the following conditions is met during the startup charging process or the parking charging process, the parking charging power-off process is performed, and the vehicle control unit reports the charging stop to the terminal:

[0096] There is a fault high-voltage power-off request, the hood is open, the door is open, and the low-voltage power supply is not in the off state; the first DC / DC feedback working state is non-working, the second DC / DC feedback working state is non-working, and the solar cell control unit working state is non-working for more than a preset time; the state of charge of the power battery is greater than the first preset value.

[0097] Specifically, high-voltage power-off faults may include insulation failure or high-voltage interlock faults, for example, some components are not connected to the high-voltage circuit, that is, the electrical connection of the system circuit is incomplete. The low-voltage power supply state that is not in the off state may include the vehicle being in the ready-to-start state or the ignition state, etc. The first DC / DC feedback working state non-working state may be a failure of the first DC / DC, and the second DC / DC feedback working state non-working state may be a failure of the second DC / DC. The working state of the solar cell control unit is non-working for more than a preset time, wherein the preset time can be obtained through experiments, and is used to determine that the voltage of the solar cell is not capable of continuing to charge the power battery, avoiding frequent state switching of the solar cell control unit. The state of charge of the power battery is greater than the first preset value, that is, the state of charge of the power battery is greater than the charging upper limit, and no further charging is required. At this time, the parking charging power-off process is carried out, and the vehicle control unit reports the charging stop to the terminal and reports the reason for stopping charging.

[0098] Optionally, Figure 6 This is a flow chart of another hybrid power system control method provided by an embodiment of the present invention. Figure 6 , the hybrid power system control method provided in this embodiment includes:

[0099] S601. In the driving preparation completion mode, if the state of charge of the power battery is less than a first preset value and the solar cell control unit reports an available status, the vehicle control unit sends a request to the solar cell control unit to control the solar cell to output power to the drive motor or charge the power battery.

[0100] S602: When the state of charge of the power battery is less than a second preset value, control the fuel cell to start.

[0101] S603: The charging condition includes the state of charge of the power battery being less than a third preset value; wherein the third preset value is greater than the second preset value.

[0102] S604: In the parking charging mode, the solar cell control unit wakes up the vehicle control unit when detecting that the solar cell is available, and the vehicle control unit sends a charging available information to the terminal.

[0103] S605: If a charging request is received from the terminal and the charging conditions are met, the vehicle control unit controls the relay to power on and controls the fuel cell control unit to enable the first DC / DC.

[0104] S606. When the relay feedback relay is closed, the first DC / DC is in working state, and the second DC / DC is in working state, the vehicle control unit sends a working request to the solar cell control unit. When the feedback working state received from the solar cell control unit is in working state, the vehicle enters the parking charging mode.

[0105] S607: If at least one of the following conditions is met during the start-up charging process or the parking charging process, the vehicle control unit sends a stop request to the solar cell control unit, the vehicle control unit stops enabling the first DC / DC converter, stops enabling the second DC / DC converter, controls the relay to power off, and the vehicle network enters a sleep state. At the same time, the vehicle control unit reports the charging stop to the terminal:

[0106] There is a fault high-voltage power-off request, the hood is open, the door is open, and the low-voltage power supply is not in the off state; the DC / DC feedback working state is not working, the second DC / DC feedback working state is not working, and the solar cell control unit working state is not working for more than a preset time; the state of charge of the power battery is greater than the first preset value.

[0107] Specifically, if at least one of the above conditions is met during the starting charging process or the parking charging process, the vehicle control unit sends a stop working request to the solar cell control unit, the vehicle control unit controls the first DC / DC to stop working, controls the second DC / DC to stop working, controls the relay to disconnect the power, and the vehicle network enters the sleep state. At the same time, the vehicle control unit reports the charging stop to the terminal and reports the reason for stopping charging.

[0108] An embodiment of the present invention further provides a hybrid power system, Figure 7 This is a schematic diagram of the structure of a hybrid power system provided by an embodiment of the present invention. This system is applicable to the hybrid power system control method described in any embodiment of the present invention. Figure 7 , the system comprises:

[0109] Vehicle control unit 1, fuel cell 2, power battery 3, relay 4, solar cell 5, solar cell control unit 6 and gateway 7; the power battery 3 is connected to the first end of the relay 4, the fuel cell 2 is connected to the second end of the relay 4; the second end of the relay 4 is connected to the drive motor 8; the solar cell control unit 6, vehicle control unit 1 and gateway 7 are in communication connection;

[0110] In the driving preparation completion mode, the vehicle control unit 1 is used to determine the power demand based on the driving operation. When the power demand exceeds the power capacity of the power battery 3, it requests to start the fuel cell 2. If the power demand does not exceed the power capacity of the power battery 3, it operates in the pure electric mode.

[0111] The vehicle control unit 1 is configured to send a request to the solar cell control unit 6 to control the solar cell 5 to output power to the drive motor 8 or charge the power battery 3 when the state of charge of the power battery 3 is less than a first preset value and the solar cell control unit 6 reports that the state is available;

[0112] In the parking charging mode, the solar cell control unit 6 is used to wake up the vehicle control unit 1 when it detects that the solar cell 5 is available. The vehicle control unit 1 sends charging available information to the terminal 10. If it receives the charging request sent by the terminal 10; when the charging conditions are met, the vehicle control unit 1 is used to control the relay 4 to power on, and at the same time control the solar cell 5 to charge the power battery 3 through the solar cell control unit 6.

[0113] Specifically, the vehicle controller 1 can be used to determine power demand based on driving operations and control the fuel cell 2 and solar cell control unit 6 to start or stop charging the power battery 3 or outputting electrical energy to the drive motor 8. The fuel cell 2 is used to charge the power battery 3 when the power demand exceeds the power capacity of the power battery 3. The power battery 3 is used to provide power to the vehicle. The relay 4 is used to switch the system state between high-voltage power on and high-voltage power off by closing and opening. The solar cell 5 is used to convert solar energy into electrical energy to charge the power battery 3. The solar cell control unit 6 is used to report the status of the solar cell 5, such as its availability and voltage, and control the solar cell 5 to charge the power battery 3. The gateway 7 can be the core of the vehicle's internal communication local area network, used to share information on various buses and implement functions such as internal vehicle network management and fault diagnosis. The drive motor 8 is used to convert electrical energy into mechanical energy, which is then used to drive the wheels and working devices through a transmission or directly. The terminal 10 can be a mobile phone app used to exchange information with the vehicle control unit via the onboard remote communication terminal 11.

[0114] Specifically, the vehicle control unit 1 determines the power demand based on driving operations. When the power demand exceeds the power capacity of the power battery 3, it requests activation of the fuel cell 2, with the power battery 3, solar cell 5, and fuel cell 2 jointly powering the vehicle. If the power demand does not exceed the power capacity of the power battery 3, the vehicle operates in pure electric mode, with the power battery 3 and solar cell 5 jointly powering the vehicle, or solely powering the vehicle. When the state of charge of the power battery 3 is less than the upper limit of the power battery 3's charge, and the voltage of the solar cell 5 reaches a voltage capable of outputting power, the vehicle control unit 1 sends a request to the solar cell control unit 6 to control the solar cell 2 to output power to the drive motor 8 or charge the power battery 3. In the parking charging mode, the solar cell control unit 6 wakes up the vehicle control unit 1 when it detects that the voltage of the solar cell 5 is capable of outputting power. The vehicle control unit 1 then sends a charging-ready message to the terminal 10. Upon receiving a charging request from the terminal 10, and if charging conditions are met, the vehicle control unit 1 controls the relay 4 to energize, while simultaneously controlling the solar cell 5 through the solar cell control unit 6 to charge the power battery 3.

[0115] The technical solution of the embodiment of the present invention provides power to the vehicle through the coordinated operation of solar cells and fuel cells. If the power demand of the vehicle exceeds the power capacity of the power battery, the fuel cell is started to power the vehicle together with the solar cells and the power battery. If the power demand of the vehicle does not exceed the power capacity of the power battery, the vehicle operates in a pure electric mode, that is, the vehicle is powered only by solar cells and the power battery. When the vehicle is in a parked charging state, the solar cell control unit can control the solar cell to charge the power battery according to the power of the solar cell and the charge state of the power battery, thereby fully utilizing solar energy and battery power and improving power supply efficiency.

[0116] Optionally, Figure 8 This is a structural diagram of another hybrid power system provided by an embodiment of the present invention. Figure 8 , the hybrid system also includes:

[0117] The fuel cell 2 includes a fuel cell stack 21, a first DC / DC 22 and a fuel cell control unit 23; the first end of the first DC / DC 22 is connected to the solar cell 5 and the fuel cell stack 21; the second end of the first DC / DC 22 is connected to the second end of the relay 4; the fuel cell control unit 23 is communicatively connected to the vehicle control unit 1.

[0118] Specifically, the fuel cell stack 21 is used to provide electrical energy to charge the power battery. The first DC / DC converter 22 can be a boost DC / DC converter used to control the solar cell 5 and / or fuel cell 2 to deliver energy to the power battery 3. The fuel cell control unit 23 is used to control the operating status of the fuel cell stack 21 and the first DC / DC converter 22. The solar cell control unit 6 and the first DC / DC converter 22 collaboratively control whether the solar cell 5 delivers energy to the power battery 3.

[0119] Optionally, Figure 9 This is a structural diagram of another hybrid power system provided by an embodiment of the present invention. Figure 9 , the hybrid system also includes:

[0120] The fuel cell 2 includes a fuel cell stack 21, a first DC / DC 22 and a fuel cell control unit 23; the first end of the first DC / DC 22 is connected to the fuel cell stack 21; the second end of the first DC / DC 22 is connected to the second end of the relay 4; the solar cell 5 is connected to the first end of the relay 4; the fuel cell control unit 23 is communicatively connected to the vehicle control unit 1.

[0121] Specifically, the embodiment of the present invention is another connection mode of the hybrid system, in which the first DC / DC 22 is only used to control the fuel cell 2 to transmit energy to the power battery 3. The solar cell 5 is only controlled by the solar cell control unit 6 to transmit energy to the power battery 3.

[0122] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0123] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A hybrid power system control method, characterized in that: include: The vehicle control unit, fuel cell, power battery, relay, solar cell, solar cell control unit and gateway; the power battery is connected to the first end of the relay, the fuel cell is connected to the second end of the relay; the second end of the relay is connected to the drive motor; The control method includes: In the driving preparation completion mode, the vehicle control unit determines the power demand based on the driving operation, and requests to start the fuel cell when the power demand exceeds the power capacity of the power battery. If the power demand does not exceed the power capacity of the power battery, the vehicle operates in the pure electric mode; If the state of charge of the power battery is less than a first preset value and the status reported by the solar cell control unit is available, the vehicle control unit sends a request to the solar cell control unit to control the solar cell to output power to the drive motor or charge the power battery; In parking charging mode, the solar cell control unit wakes up the vehicle control unit when detecting that the solar cell is available, and the vehicle control unit sends a charging available information to the terminal. If a charging request is received from the terminal and the charging conditions are met, the vehicle control unit controls the relay to power on, and at the same time controls the solar cell through the solar cell control unit to charge the power battery; The fuel cell includes a fuel cell stack, a first DC / DC and a fuel cell control unit; the second end of the relay is connected to a second DC / DC, which is a low-voltage power supply DC / DC. The second DC / DC is also connected to a battery. If the second DC / DC is in a non-working state during the starting charging process or the parking charging process, the parking charging power-off process is performed.

2. The method according to claim 1, characterized in that The vehicle control unit determines a power demand based on a driving operation, and requests to start the fuel cell when the power demand exceeds the power capacity of the power battery, including: When the state of charge of the power battery is less than a second preset value, controlling the fuel cell to start; The charging condition includes when the state of charge of the power battery is less than a third preset value; wherein, the third preset value is greater than the second preset value.

3. The method according to claim 2, characterized in that Also includes: When the state of charge of the power battery is greater than or equal to the third preset value, the vehicle control unit controls the fuel cell to shut down; When the state of charge of the power battery is greater than the first preset value, the solar cell control unit controls the solar cell to stop working.

4. The method according to claim 1, wherein Necessary conditions for entering the parking charging mode include: no one in the vehicle, the vehicle is locked, and the vehicle network is in sleep mode.

5. The method according to claim 2, characterized in that The charging condition includes at least one of the following: there is no high-voltage power-on prohibition fault, the engine hood is in a closed state, the vehicle door is in a closed state, and the low-voltage power supply state is off.

6. The method according to claim 2, characterized in that The second end of the relay is connected to a second DC / DC; The vehicle control unit controls the relay to be powered on, and at the same time controls the solar cell to charge the power battery through the solar cell control unit, including: The vehicle control unit controls the relay to be powered on, and controls the fuel cell control unit to enable the first DC / DC; When the relay feedback relay is closed, the first DC / DC is in working state, and the second DC / DC is in working state, the vehicle control unit sends a working request to the solar cell control unit. When the feedback working state received from the solar cell control unit is in working state, the vehicle enters the parking charging mode.

7. The method according to claim 1, characterized in that The parking charging power-off process includes: The vehicle control unit sends a stop operation request to the solar cell control unit, the vehicle control unit stops enabling the first DC / DC, stops enabling the second DC / DC, controls the relay to power off, and the vehicle network enters a sleep state.

8. A hybrid power system, characterized in that: include: A vehicle control unit, a fuel cell, a power battery, a relay, a solar cell, a solar cell control unit, and a gateway; the power battery is connected to a first end of the relay, the fuel cell is connected to a second end of the relay; the second end of the relay is connected to a drive motor; the solar cell control unit and the vehicle control unit are in communication with the gateway; In the driving preparation completion mode, the vehicle control unit is configured to determine a power demand based on driving operation, and request to start the fuel cell when the power demand exceeds the power capacity of the power battery; if the power demand does not exceed the power capacity of the power battery, the vehicle operates in a pure electric mode; The vehicle control unit is configured to send a request to the solar cell control unit to control the solar cell to output electric energy to the drive motor or charge the power battery when the state of charge of the power battery is less than a first preset value and the status reported by the solar cell control unit is available; In the parking charging mode, the solar cell control unit is used to wake up the vehicle control unit when it detects that the solar cell is available. The vehicle control unit sends a charging available message to the terminal. If a charging request sent by the terminal is received; when the charging conditions are met, the vehicle control unit is used to control the relay to power on, and at the same time control the solar cell to charge the power battery through the solar cell control unit; The fuel cell includes a fuel cell stack, a first DC / DC and a fuel cell control unit; the second end of the relay is connected to a second DC / DC, which is a low-voltage power supply DC / DC. The second DC / DC is also connected to a battery. If the second DC / DC is in a non-working state during the starting charging process or the parking charging process, the parking charging power-off process is performed.

9. The hybrid power system according to claim 8, characterized in that: A first end of the first DC / DC is connected to the solar cell and the fuel cell stack; a second end of the first DC / DC is connected to a second end of the relay; The fuel cell control unit is communicatively connected to the vehicle control unit.

10. The hybrid power system according to claim 8, characterized in that: The first end of the first DC / DC is connected to the fuel cell stack; the second end of the first DC / DC is connected to the second end of the relay; the solar cell is connected to the first end of the relay; The fuel cell control unit is communicatively connected to the vehicle control unit.

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