Electric vehicle energy recovery method and device, energy recovery system and vehicle

Abstract

The invention provides an electric vehicle energy recovery method and device, an energy recovery system and an electric vehicle, and relates to the technical field of vehicle energy recovery. A motor loaded on a drive axle on the target vehicle is controlled to convert fuel energy of a fuel cell on the target vehicle into mechanical energy in a driving mode, and if the target vehicle is switched from a running state to a braking state, the motor is controlled to be switched from the driving mode to an energy recovery mode; determining whether the auxiliary power supply battery is in an electric quantity saturation state; and if the auxiliary power supply battery is in the electric quantity saturation state, controlling an energy recovery path between the motor and the auxiliary power supply battery to be disconnected, and controlling a power supply path between the motor and a target electric load corresponding to the auxiliary power supply battery to be opened. The energy recovery efficiency of the electric vehicle is improved, the braking control capacity of the electric vehicle is improved, and the service life of the auxiliary power supply battery is prolonged.

Description

Technical Field

[0001] The present application relates to the field of vehicle energy recovery technology, and more specifically, to an energy recovery method, equipment, energy recovery system and vehicle for an electric vehicle. Background Art

[0002] As the world pays more and more attention to environmental issues, hydrogen fuel cells, as an efficient and clean energy source, are widely used in various means of transportation, especially fuel cell vehicles. Among them, fuel cell dump trucks have been widely used in the field of logistics and transportation due to their strong load-bearing capacity and long driving range. Energy recovery is an important link in the operation of fuel cell vehicles. It can convert the energy generated by the vehicle during braking into electrical energy, thereby improving energy utilization efficiency.

[0003] At present, when a fuel cell dump truck is going downhill, the energy recovery system can convert the vehicle's kinetic energy into electrical energy and store it in the auxiliary power supply battery. When the auxiliary power supply battery is full, the excess electrical energy can be consumed through resistance and other methods to prevent the auxiliary power supply battery from overcharging.

[0004] However, when the battery is fully charged, the excess electrical energy cannot be effectively consumed, which will result in energy waste. Directly consuming the excess electrical energy through resistance will not only affect the vehicle's energy recovery efficiency, but also affect the service life of the auxiliary power supply battery. It may also affect the energy recovery's braking control ability on downhill slopes, making energy recovery ineffective and causing excessive wear of the brake pads. Summary of the invention

[0005] The purpose of this application is to provide an electric vehicle energy recovery method, equipment, energy recovery system and vehicle to address the deficiencies in the above-mentioned prior art, thereby improving the energy recovery efficiency of the electric vehicle, the braking control capability of the electric vehicle, and extending the life of the auxiliary power supply battery.

[0006] To achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

[0007] In a first aspect, an embodiment of the present application provides an electric vehicle energy recovery method, the method comprising:

[0008] When the target vehicle is in a driving state, controlling the motor mounted on the drive axle of the target vehicle to convert the fuel cell on the target vehicle into mechanical energy in a driving mode to provide driving force for the target vehicle;

[0009] If the target vehicle switches from a driving state to a braking state, the motor is controlled to switch from the driving mode to an energy recovery mode, in which the vehicle kinetic energy during the braking process of the target vehicle is converted into electrical energy and recovered into an auxiliary power supply battery on the target vehicle;

[0010] Acquire the power state parameter of the auxiliary power supply battery in the energy recovery mode;

[0011] Determining whether the auxiliary power supply battery is in a saturated state according to the power state parameter of the auxiliary power supply battery;

[0012] If the auxiliary power supply battery is in the power saturation state, the energy recovery path between the motor and the auxiliary power supply battery is controlled to be disconnected, and the power supply path between the motor and the target power load corresponding to the auxiliary power supply battery is controlled to be opened.

[0013] Optionally, the state of charge parameter includes: a state of charge parameter or a battery capacity parameter, and determining whether the auxiliary power supply battery is in a saturated state according to the state of charge parameter of the auxiliary power supply battery includes:

[0014] Determining whether the state of charge parameter is greater than or equal to a preset saturated state of charge parameter;

[0015] If the state of charge parameter is greater than or equal to the preset saturated state of charge parameter, it is determined that the auxiliary power supply battery is in a saturated state of charge;

[0016] If the state of charge parameter is less than the preset saturated state of charge parameter, determining that the auxiliary power supply battery is not in a saturated state of charge;

[0017] Alternatively, determining whether the battery capacity parameter is greater than or equal to a preset saturated battery capacity parameter;

[0018] If the battery capacity parameter is greater than or equal to the preset saturated battery capacity parameter, it is determined that the auxiliary power supply battery is in a saturated state;

[0019] If the battery capacity parameter is less than the preset saturated battery capacity parameter, it is determined that the auxiliary power supply battery is not in a saturated state.

[0020] Optionally, the target power load includes at least: a first power load, and a monitoring sensor is provided on a first power supply path between the motor and the first power load; and the controlling of opening the power supply path between the motor and the target power load corresponding to the auxiliary power supply battery includes:

[0021] Controlling the first power supply path to be turned on;

[0022] The method further comprises: wherein the first electrical load comprises: an electric heating element;

[0023] Acquire power supply status parameters on the first power supply path collected by the monitoring sensor;

[0024] Determining whether the first power load meets a preset safety protection condition according to the power supply status parameter;

[0025] If the first electrical load meets a preset safety protection condition, the first power supply path is controlled to be disconnected.

[0026] Optionally, the monitoring sensor includes: a voltage sensor, and the power supply status parameter includes: a voltage parameter;

[0027] Determining whether the first power load meets a preset safety protection condition according to the power supply state parameter includes:

[0028] determining whether the voltage parameter is greater than or equal to a preset heating voltage threshold;

[0029] If the voltage parameter is greater than or equal to the preset heating voltage threshold, it is determined that the electric heating element meets the preset safety protection condition;

[0030] If the voltage parameter is less than the preset heating voltage threshold, it is determined that the electric heating element does not meet the preset safety protection condition.

[0031] Optionally, the monitoring sensor further comprises: a current sensor, and the power supply state parameter comprises: a current parameter;

[0032] Determining whether the first power load meets a preset safety protection condition according to the power supply state parameter includes:

[0033] Determining whether the current parameter is greater than or equal to a preset heating current threshold;

[0034] If the current parameter is greater than or equal to the preset heating current threshold, it is determined that the electric heating element meets the preset safety protection condition;

[0035] If the current parameter is less than the preset heating current threshold, it is determined that the electric heating element does not meet the preset safety protection condition.

[0036] Optionally, the controlling the opening of a power supply path between the motor and a target power load corresponding to the auxiliary power supply battery includes:

[0037] If the heating function corresponding to the electric heating element is in an on state, the power supply path between the motor and the electric heating element is controlled to be turned on.

[0038] Optionally, the electric heating element is a columnar electric heating wire made of a nickel-chromium alloy with high resistivity, and the electric heating element is evenly distributed inside the bottom plate of the target vehicle.

[0039] In a second aspect, another embodiment of the present application provides a control device, comprising: a processor and a memory, wherein the memory stores machine-readable instructions executable by the processor, and when the server is running, the processor executes the machine-readable instructions to perform the steps of the electric vehicle energy recovery method described in the first aspect above.

[0040] In a third aspect, another embodiment of the present application provides an energy recovery control system, the energy recovery control system comprising: a control device, a motor arranged on an electric drive axle, a fuel cell, an auxiliary power supply battery, a first switch and a second switch;

[0041] The driving end of the motor is used to connect to the driving shaft, the first power end of the motor is connected to the fuel cell, the second power end of the motor is connected to the auxiliary power supply battery, the second power end of the motor is also used to connect to the target power load, a first switch is provided on the energy recovery path between the second power end of the motor and the auxiliary power supply battery, and a second switch is provided on the power supply path between the second power end of the motor and the target power load;

[0042] The control device is connected to the control end of the motor, the auxiliary power supply battery, the first switch and the second switch, and the control device is used to execute the steps of the electric vehicle energy recovery method described in the first aspect above.

[0043] In a fourth aspect, another embodiment of the present application further provides an electric vehicle, the vehicle comprising an electric vehicle body having the energy recovery control system as described in the third aspect above.

[0044] In a fifth aspect, another embodiment of the present application provides a vehicle energy recovery device, the device comprising:

[0045] A first control module is used to control the motor loaded on the drive axle of the target vehicle to convert the fuel cell on the target vehicle into mechanical energy in a driving mode to provide driving force for the target vehicle when the target vehicle is in a driving state;

[0046] a second control module, configured to control the motor to switch from the driving mode to an energy recovery mode if the target vehicle switches from a driving state to a braking state, in which the vehicle kinetic energy during the braking process of the target vehicle is converted into electrical energy and recovered into an auxiliary power supply battery on the target vehicle;

[0047] An acquisition module, used to acquire the power state parameters of the auxiliary power supply battery in the energy recovery mode;

[0048] A determination module, used to determine whether the auxiliary power supply battery is in a power saturation state according to the power state parameter of the auxiliary power supply battery;

[0049] The third control module is used to control the energy recovery path between the motor and the auxiliary power supply battery to be disconnected if the auxiliary power supply battery is in the power saturation state, and control the power supply path between the motor and the target power load corresponding to the auxiliary power supply battery to be opened.

[0050] In a sixth aspect, another embodiment of the present application provides a storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the electric vehicle energy recovery method as described in any one of the first aspects above are executed.

[0051] The beneficial effects of this application are:

[0052] The present application provides an electric vehicle energy recovery method, device, energy recovery system and electric vehicle. When a target vehicle is in a driving state, a motor loaded on a drive axle on the target vehicle is controlled to convert the fuel cell on the target vehicle into mechanical energy in a driving mode to provide driving force for the target vehicle; if the target vehicle switches from a driving state to a braking state, the motor is controlled to switch from the driving mode to an energy recovery mode, in which the vehicle kinetic energy during the braking process of the target vehicle is converted into electrical energy and recovered to an auxiliary power supply battery on the target vehicle; a power state parameter of the auxiliary power supply battery in the energy recovery mode is obtained; based on the power state parameter of the auxiliary power supply battery, it is determined whether the auxiliary power supply battery is in a power saturation state; if the auxiliary power supply battery is in the power saturation state, the energy recovery path between the motor and the auxiliary power supply battery is controlled to be disconnected, and the power supply path between the motor and the target power load corresponding to the auxiliary power supply battery is controlled to be opened. This application determines whether to turn on the energy recovery system according to the current driving conditions of the target vehicle, consumes the mechanical energy of the target vehicle in the braking state, thereby improving the efficiency of energy recovery and the service life of the target vehicle's auxiliary power supply battery, avoiding energy waste caused by excess electricity, and solving the power consumption problem of other electrical loads on the target vehicle. In addition, the target vehicle can be assisted in braking through energy recovery, improving the braking control ability of the target vehicle in the braking state and reducing excessive wear of the brake pads. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0054] Figure 1 A schematic diagram of a flow chart of an electric vehicle energy recovery method provided in an embodiment of the present application;

[0055] Figure 2 A schematic diagram of a flow chart for determining the state of an auxiliary power supply battery in an electric vehicle energy recovery method provided in an embodiment of the present application;

[0056] Figure 3 A schematic diagram of a flow chart for determining the state of an auxiliary power supply battery in another electric vehicle energy recovery method provided in an embodiment of the present application;

[0057] Figure 4 A schematic diagram of a flow chart of controlling a power supply path in an electric vehicle energy recovery method provided in an embodiment of the present application;

[0058] Figure 5 A schematic diagram of a flow chart for determining safety protection conditions in an electric vehicle energy recovery method provided in an embodiment of the present application;

[0059] Figure 6 A schematic diagram of a flow chart for determining safety protection conditions in another electric vehicle energy recovery method provided in an embodiment of the present application;

[0060] Figure 7 A schematic diagram of the structure of a control device provided in an embodiment of the present application;

[0061] Figure 8 A schematic diagram of the structure of an energy recovery system provided in an embodiment of the present application;

[0062] Fig. 9 A schematic diagram of the structure of an electric vehicle provided in an embodiment of the present application;

[0063] Fig.10 A schematic structural diagram of an electric vehicle energy recovery device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0064] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of explanation and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in this application shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can be implemented out of sequence, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art can add one or more other operations to the flowchart under the guidance of the content of the present application, or remove one or more operations from the flowchart.

[0065] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0066] It should be noted that the term "comprising" will be used in the embodiments of the present application to indicate the existence of the features declared thereafter, but does not exclude the addition of other features.

[0067] In order to clearly describe the electric vehicle energy recovery method provided by the embodiment of the present application, the electric vehicle energy recovery method provided by the present application is described below in combination with multiple embodiments. The vehicle in the present application is a fuel cell vehicle, which includes a fuel cell and an auxiliary power supply battery. The fuel cell vehicle uses the fuel cell as the power source of the vehicle, and the auxiliary power supply battery is used to power the electrical equipment of the fuel cell vehicle, such as cabin heating, to improve the efficiency and comfort of the vehicle. The auxiliary power supply battery generally has a small capacity, so it is easier to reach a saturated state.

[0068] Figure 1 A schematic diagram of a flow chart of an electric vehicle energy recovery method provided in an embodiment of the present application, such as Figure 1 As shown, the method includes:

[0069] Step 101: When a target vehicle is in a driving state, control a motor mounted on a drive axle of the target vehicle to convert a fuel cell on the target vehicle into mechanical energy in a driving mode to provide driving force for the target vehicle.

[0070] Among them, the target vehicle can be a fuel cell vehicle, a fuel cell dump truck or other fuel cell vehicles, and the embodiments of the present application do not limit this. The driving state can be driving on a smooth road or driving on an uphill road, that is, the driving state in which the driving force is in the same direction as the target vehicle, and the embodiments of the present application do not limit this. The motor is in the driving mode, that is, the driving force of the target vehicle is in the same direction as the target vehicle. The fuel cell can be a methanol fuel cell or a hydrogen fuel cell. The driving force is used to drive the target vehicle forward.

[0071] Optionally, when the target vehicle is in a driving state, that is, the forward direction of the target vehicle is consistent with the direction of the driving force, the motor loaded on the drive axle of the target vehicle is controlled to enter a driving mode, and the fuel cell in the target vehicle converts the fuel in the target vehicle into electrical energy to drive the motor to generate mechanical energy to drive the target vehicle, thereby providing driving force for the target vehicle and driving the target vehicle forward.

[0072] Step 102: If the target vehicle switches from a driving state to a braking state, the control motor is switched from a driving mode to an energy recovery mode, in which the vehicle kinetic energy during the braking process of the target vehicle is converted into electrical energy and recovered to an auxiliary power supply battery on the target vehicle.

[0073] Among them, the braking mode is that the vehicle's forward direction is opposite to the driving force direction, and the driving force is used to prevent the target vehicle from moving forward. The energy recovery mode is used to convert the kinetic energy of the target vehicle's forward direction into electrical energy to achieve the recovery of the target vehicle's kinetic energy. The auxiliary power supply battery is a lithium battery, which is different from a fuel cell. The auxiliary power supply battery is connected to the motor and is used to power the electrical equipment on the target vehicle.

[0074] Optionally, if the target vehicle switches from a driving state to a braking state, and the driving force of the target vehicle is opposite to the forward direction of the target vehicle, the brake motor switches from a driving mode to an energy recovery mode, and the motor of the target vehicle is in a reverse state relative to the driving force. The energy recovery mode converts the vehicle kinetic energy during the braking process of the target vehicle into electrical energy and recovers it to an auxiliary power supply battery on the target vehicle. When the motor of the target vehicle is in a reverse state relative to the driving force, it can also be used to assist in braking the target vehicle, thereby improving the braking efficiency of the target vehicle.

[0075] Step 103: Obtain the power state parameters of the auxiliary power supply battery in the energy recovery mode.

[0076] The battery status parameter is used to determine the current status of the auxiliary power supply battery, and the status of the auxiliary power supply battery may be the state of charge and the battery capacity. A battery management system is provided in the auxiliary power supply battery.

[0077] Optionally, the power state parameters of the auxiliary power supply battery in the energy recovery mode are determined by receiving a message of the power state parameters of the auxiliary power supply battery sent by a battery management system in the auxiliary power supply battery.

[0078] Step 104: Determine whether the auxiliary power supply battery is in a saturated state according to the power state parameter of the auxiliary power supply battery.

[0079] Optionally, if the power state parameter of the auxiliary power supply battery meets the power saturation parameter of the auxiliary power supply battery, it is determined that the auxiliary power supply battery is in a power saturation state; otherwise, the auxiliary power supply battery is not in a power saturation state.

[0080] Step 105: If the auxiliary power supply battery is in a saturated state, the energy recovery path between the motor and the auxiliary power supply battery is controlled to be disconnected, and the power supply path between the motor and the target power load corresponding to the auxiliary power supply battery is controlled to be opened.

[0081] Among them, the target power load can be a heating device, a lighting device, a refrigeration device or other equipment on the target vehicle that requires electricity, and the embodiment of the present application does not limit this.

[0082] Optionally, if the auxiliary power supply battery is in a saturated state, it means that there is no need to charge the auxiliary power supply battery. At this time, the energy recovery path between the control motor and the auxiliary power supply battery is disconnected, and the power supply path between the control motor and the target power load corresponding to the auxiliary power supply battery is opened. A first switch can be set in the energy recovery path between the control motor and the auxiliary power supply battery, and the energy recovery path between the control motor and the auxiliary power supply battery is disconnected by disconnecting the first switch. A second switch can be set in the power supply path between the control motor and the target power load corresponding to the auxiliary power supply battery, and the power supply path between the control motor and the target power load corresponding to the auxiliary power supply battery is opened by closing the second switch.

[0083] The present application provides an electric vehicle energy recovery method, when the target vehicle is in a driving state, the motor loaded on the drive axle on the target vehicle is controlled to convert the fuel cell on the target vehicle into mechanical energy in the driving mode to provide driving force for the target vehicle; if the target vehicle switches from the driving state to the braking state, the motor is controlled to switch from the driving mode to the energy recovery mode, and in the energy recovery mode, the vehicle kinetic energy during the braking process of the target vehicle is converted into electrical energy and recovered to the auxiliary power supply battery on the target vehicle; the power state parameter of the auxiliary power supply battery in the energy recovery mode is obtained; according to the power state parameter of the auxiliary power supply battery, whether the auxiliary power supply battery is in a saturated state is determined; if the auxiliary power supply battery is in the saturated state, the energy recovery path between the motor and the auxiliary power supply battery is controlled to be disconnected, and the power supply path between the motor and the target power load corresponding to the auxiliary power supply battery is controlled to be opened. The present application determines whether to turn on the energy recovery system according to the current driving condition of the target vehicle, consumes the mechanical energy of the target vehicle in the braking state, thereby improving the efficiency of energy recovery and the service life of the auxiliary power supply battery of the target vehicle, avoiding energy waste caused by excess electric energy, and solving the power consumption problem of other power loads on the target vehicle. And the target vehicle can be assisted in braking through energy recovery, thereby improving the braking control ability of the target vehicle in the braking state and reducing excessive wear of the brake pads.

[0084] On the basis of the above embodiment, the state of charge parameter includes: state of charge parameter, the present application also provides a process for determining the state of the auxiliary power supply battery in the electric vehicle energy recovery method, Figure 2 A schematic diagram of a flow chart of determining the state of an auxiliary power supply battery in an electric vehicle energy recovery method provided in an embodiment of the present application, such as Figure 2 As shown, in the above step 104, determining whether the auxiliary power supply battery is in a saturated state according to the power state parameter of the auxiliary power supply battery includes:

[0085] Step 201: Determine whether a state of charge parameter is greater than or equal to a preset saturated state of charge parameter.

[0086] The state of charge parameter is a state of charge (SOC) parameter, which is used to describe the ratio between the current remaining power and the full power of the auxiliary power supply battery. The preset saturated state of charge parameter can be 90%.

[0087] Optionally, the state of charge parameter of the auxiliary power supply battery is compared with a preset saturated state of charge parameter of the auxiliary power supply battery to determine whether the state of charge parameter of the auxiliary power supply battery is greater than or equal to the preset saturated state of charge parameter.

[0088] Step 202: If the state of charge parameter is greater than or equal to the preset saturated state of charge parameter, it is determined that the auxiliary power supply battery is in a saturated state of charge.

[0089] Optionally, if a ratio parameter between the current remaining power of the auxiliary power supply battery and the full power is greater than or equal to a preset saturated state of charge parameter, it can be determined that the auxiliary power supply battery is in a saturated state of charge.

[0090] Step 203: If the state of charge parameter is less than the preset saturated state of charge parameter, it is determined that the auxiliary power supply battery is not in a saturated state of charge.

[0091] Optionally, if a ratio parameter between the current remaining power of the auxiliary power supply battery and the full power is less than a preset saturated state of charge parameter, it can be determined that the auxiliary power supply battery is in a saturated state of charge.

[0092] In the embodiment of the present application, by determining whether the charge state parameter of the auxiliary power supply battery is greater than or equal to the preset saturated charge state parameter, it is judged whether the auxiliary power supply battery is in a saturated state of charge. This allows for more accurate detection of the auxiliary power supply battery, protecting the safety of the auxiliary power supply battery, and increasing the life of the auxiliary power supply battery.

[0093] Based on the above embodiment, the power state parameter package: battery capacity parameter, the present application also provides another process for determining the auxiliary power supply battery state in the electric vehicle energy recovery method, Figure 3 A schematic diagram of a flow chart for determining the state of an auxiliary power supply battery in another electric vehicle energy recovery method provided in an embodiment of the present application, such as Figure 3 As shown, in the above step 104, determining whether the auxiliary power supply battery is in a saturated state according to the power state parameter of the auxiliary power supply battery includes:

[0094] Step 301: Determine whether a battery capacity parameter is greater than or equal to a preset saturated battery capacity parameter.

[0095] The battery capacity parameter is the current battery capacity of the auxiliary power supply battery. The preset saturated battery capacity parameter is the battery capacity corresponding to the auxiliary power supply battery when it is saturated. When the auxiliary power supply battery signal is different, the corresponding preset saturated battery capacity parameter is different. This embodiment of the application does not limit this.

[0096] Optionally, a battery capacity parameter of the auxiliary power supply battery is compared with a preset saturated battery capacity parameter of the auxiliary power supply battery to determine whether the battery capacity parameter of the auxiliary power supply battery is greater than or equal to the preset saturated battery capacity parameter.

[0097] Step 302: If the battery capacity parameter is greater than or equal to the preset saturated battery capacity parameter, it is determined that the auxiliary power supply battery is in a saturated state.

[0098] Optionally, if the current battery capacity parameter of the auxiliary power supply battery is greater than or equal to a preset saturated state of charge parameter, it can be determined that the auxiliary power supply battery is in a saturated state of charge.

[0099] Step 303: If the battery capacity parameter is less than the preset saturated battery capacity parameter, it is determined that the auxiliary power supply battery is not in a saturated state.

[0100] Optionally, if the current battery capacity parameter of the auxiliary power supply battery is less than a preset saturated state of charge parameter, it can be determined that the auxiliary power supply battery is in a saturated state of charge.

[0101] In the embodiment of the present application, by determining whether the battery capacity parameter of the auxiliary power supply battery is greater than or equal to the preset saturated battery capacity parameter, it is judged whether the auxiliary power supply battery is in a saturated state, and the current state of the auxiliary power supply battery can be better determined, thereby protecting the safety of the auxiliary power supply battery and improving the life of the auxiliary power supply battery.

[0102] On the basis of the above embodiment, the target power load includes at least: a first power load, and a monitoring sensor is provided on the first power supply path between the motor and the first power load; the present application also provides a process for controlling the power supply path in the electric vehicle energy recovery method, Figure 4 A schematic diagram of a flow chart of controlling a power supply path in an electric vehicle energy recovery method provided in an embodiment of the present application, such as Figure 4 As shown: in the above step 105, controlling the power supply path between the motor and the target power load corresponding to the auxiliary power supply battery to be opened includes:

[0103] Step 401: Control the first power supply path to be turned on.

[0104] The first electrical load may be an electric heating element. The electric heating element is a columnar electric heating wire made of a nickel-chromium alloy with high resistivity, and the electric heating element is evenly distributed inside the bottom plate of the target vehicle. Specifically, the electric heating element may be a columnar electric heating wire with a length of two meters and a diameter of 2 mm, and is evenly distributed inside the bottom plate of the target vehicle.

[0105] Optionally, controlling the first power supply path to open means controlling the first power supply path between the motor and the first power load to open. A switch may be provided on the first path, and the switch may be a relay. The first power supply path is opened by controlling the switch on the first power supply path to close.

[0106] Based on the above step 401, the method further includes:

[0107] Step 402: Obtain power supply status parameters on the first power supply path collected by a monitoring sensor.

[0108] The power supply state parameter may be a voltage parameter, a current parameter or other parameter related to the power supply of the first power load. The corresponding monitoring sensor may be a voltage sensor or a current sensor.

[0109] Step 403: Determine whether the first power load meets a preset safety protection condition according to the power supply status parameter.

[0110] Optionally, the power supply state parameter is compared with a preset safety protection condition of the first power load to determine whether the first power load satisfies the preset safety protection condition.

[0111] Step 404: If the first power load meets the preset safety protection condition, the first power supply path is controlled to be disconnected.

[0112] Optionally, if the first electrical load satisfies the preset safety protection condition, indicating that continuing to charge the first electrical load will exceed the preset safety protection condition and may cause damage to the first electrical load, the first power supply path needs to be disconnected.

[0113] In an embodiment of the present application, after the first power supply path is turned on, it is determined whether the first power load meets the preset safety protection conditions based on the data collected by the monitoring sensor on the first power supply path, thereby determining whether the first power supply path is disconnected, thereby ensuring the safety of the first power load and improving the service life of the first power load.

[0114] On the basis of the above embodiment, the monitoring sensor includes: a voltage sensor, and the power supply state parameter includes: a voltage parameter; the present application also provides a process for determining a safety protection condition in an electric vehicle energy recovery method, Figure 5 A schematic diagram of a flow chart for determining safety protection conditions in an electric vehicle energy recovery method provided in an embodiment of the present application, such as Figure 5 As shown, in the above step 403, determining whether the first power load meets the preset safety protection condition according to the power supply state parameter includes:

[0115] Step 501: Determine whether a voltage parameter is greater than or equal to a preset heating voltage threshold.

[0116] The voltage parameter is a voltage parameter across the first electrical load. When the first electrical load is different, the corresponding preset heating voltage threshold is different. When the first electrical load is a load with a large power consumption, the preset heating voltage threshold is large. If the first electrical load is a load with a small power consumption, the preset heating voltage threshold is small.

[0117] Optionally, when the first power load is an electric heating element, the voltage parameter across the electric heating element detected by the voltage sensor is compared with a preset heating voltage threshold corresponding to the electric heating element to determine whether the voltage parameter of the electric heating element is greater than or equal to the preset heating voltage threshold.

[0118] Step 502: If the voltage parameter is greater than or equal to the preset heating voltage threshold, it is determined that the electric heating element meets the preset safety protection condition.

[0119] Optionally, if the voltage parameter is greater than or equal to a preset heating voltage threshold, it means that continuing to supply power to the electric heating element will cause the electric heating element to be damaged due to excessive voltage. It is then determined that the electric heating element meets the preset safety protection conditions and the electric heating element needs to be protected.

[0120] Step 503: If the voltage parameter is less than the preset heating voltage threshold, it is determined that the electric heating element does not meet the preset safety protection condition.

[0121] Optionally, if the voltage parameter is less than a preset heating voltage threshold, it means that continuing to supply power to the electric heating element will not cause damage to the electric heating element due to excessive voltage. It is determined that the electric heating element does not meet the preset safety protection condition and the electric heating element can continue to be powered.

[0122] In the embodiment of the present application, it is determined whether the voltage parameter of the first electrical load is greater than or equal to the preset heating voltage threshold, thereby determining whether the heating element meets the preset safety protection condition. The electric heating element can be protected, thereby avoiding damage to the target vehicle caused by damage to the electric heating element.

[0123] On the basis of the above embodiment, the monitoring sensor includes: a current sensor, and the power supply state parameter includes: a voltage parameter; the present application also provides another process for determining the safety protection condition in the electric vehicle energy recovery method, Figure 6 A schematic diagram of a flow chart for determining safety protection conditions in another electric vehicle energy recovery method provided in an embodiment of the present application, such as Figure 6 As shown, in the above step 403, determining whether the first power load meets the preset safety protection condition according to the power supply state parameter includes:

[0124] Step 601: Determine whether the current parameter is greater than or equal to a preset heating current threshold.

[0125] The current parameter is a current parameter flowing through the first electrical load. When the first electrical load is different, the corresponding preset heating current threshold is different. When the first electrical load is a load with a large power consumption, the preset heating current threshold is large, and when the first electrical load is a load with a small power consumption, the preset heating current threshold is small.

[0126] Optionally, when the first power load is an electric heating element, the current parameter flowing through the electric heating element detected by the current sensor is compared with a preset heating current threshold corresponding to the electric heating element to determine whether the current parameter of the electric heating element is greater than or equal to the preset heating current threshold.

[0127] Step 602: If the current parameter is greater than or equal to the preset heating current threshold, it is determined that the electric heating element meets the preset safety protection condition.

[0128] Optionally, if the current parameter is greater than or equal to a preset heating current threshold, it means that continuing to supply power to the electric heating element will cause the electric heating element to be damaged due to excessive current. It is then determined that the electric heating element meets the preset safety protection conditions and the electric heating element needs to be protected.

[0129] Step 603: If the current parameter is less than the preset heating current threshold, it is determined that the electric heating element does not meet the preset safety protection condition.

[0130] Optionally, if the current parameter is less than a preset heating current threshold, it means that continuing to supply power to the electric heating element will not cause damage to the electric heating element due to excessive current. It is determined that the electric heating element does not meet the preset safety protection condition and the electric heating element can continue to be powered.

[0131] In the embodiment of the present application, it is determined whether the current parameter of the first electrical load is greater than or equal to the preset heating current threshold, thereby determining whether the heating element meets the preset safety protection condition. The electric heating element can be protected, thereby avoiding damage to the target vehicle caused by damage to the electric heating element.

[0132] Based on the above embodiment, the present application further provides a process for controlling the opening of a power supply path in an electric vehicle energy recovery method. In the above step 401, controlling the opening of a power supply path between a motor and an electric heating element includes:

[0133] If the heating function corresponding to the electric heating element is in an on state, the power supply path between the control motor and the electric heating element is turned on.

[0134] Optionally, before controlling the power supply path between the motor and the electric heating element to be turned on, it is also necessary to determine that the heating function corresponding to the electric heating element is in the turned-on state. If the heating function corresponding to the electric heating element is in the turned-on state, it means that the electric heating element needs to be heated, and the power supply path between the motor and the electric heating element can be controlled to be turned on. If the heating function corresponding to the electric heating element is not in the turned-on state, it means that there is no need to heat the heating element and the power supply path between the motor and the electric heating element cannot be controlled to be turned on.

[0135] For example, when the target vehicle is a fuel cell dump truck, the fuel cell dump truck has an electric heating element on the bottom of the large box. When it is winter, the driver of the fuel cell dump truck controls the heating function corresponding to the electric heating element to be turned on. When the fuel cell dump truck is in a braking state and the energy recovery mode is controlled to be turned on, and the state of charge parameter of the auxiliary power supply battery is in a saturated state, the power supply path between the motor and the electric heating element can be controlled to be turned on. Correspondingly, if the driver of the fuel cell dump truck controls the heating function corresponding to the electric heating element not to be turned on, when the fuel cell dump truck is in a braking state and the energy recovery mode is controlled to be turned on, and the state of charge parameter of the auxiliary power supply battery is in a saturated state, the power supply path between the motor and the electric heating element can be controlled to be unable to be turned on.

[0136] In an embodiment of the present application, before the power supply path between the control motor and the electric heating element is opened, it is also necessary to determine whether the heating function corresponding to the electric heating element is in the turned-on state to ensure accurate heating of the electric heating element and avoid ineffective energy recovery due to the target vehicle.

[0137] The present application also provides a control device, Figure 7 A schematic diagram of a control device provided in an embodiment of the present application is shown in FIG. Figure 7 As shown, the control device includes: a processor 701 and a memory 702. The memory 702 stores machine-readable instructions executable by the processor 701. When the control device is running, the processor executes the machine-readable instructions, and when the machine-readable instructions are executed by the processor 701, the steps of the above-mentioned electric vehicle energy recovery method are performed.

[0138] Another embodiment of the present application provides an energy recovery control system, Figure 8 A schematic diagram of the structure of an energy recovery system provided in an embodiment of the present application is shown in FIG. Figure 8 As shown, the energy recovery control system 800 includes: a control device 801, a motor 803 arranged on an electric drive bridge 802, a fuel cell 804, an auxiliary power supply battery 805, a first switch 806 and a second switch 807;

[0139] The driving end of the motor 803 is used to connect to a driving shaft (not shown in the figure), the first power supply end of the motor 803 is connected to the fuel cell 804, the second power supply end of the motor 803 is connected to the auxiliary power supply battery 805, the second power supply end of the motor 803 is also used to connect to a target power load 808, a first switch 806 is provided on an energy recovery path between the second power supply end of the motor 803 and the auxiliary power supply battery 805, and a second switch 807 is provided on a power supply path between the second power supply end of the motor 803 and the target power load 808;

[0140] The control device 801 is connected to the control end of the motor 803, the auxiliary power supply battery 805, the first switch 806 and the second switch 807, and the control device 801 is used to execute the steps of the above-mentioned electric vehicle energy recovery method.

[0141] Among them, the motor 803 is connected to both the fuel cell 804 and the auxiliary power supply battery 805. The fuel cell 804 is used to drive the target vehicle, converting the fuel in the target vehicle into electrical energy to drive the motor to generate mechanical energy to drive the target vehicle. The auxiliary power supply battery 805 is used to turn on the energy recovery mode when the target vehicle is braked. In the energy recovery mode, the vehicle kinetic energy of the target vehicle during the braking process is converted into electrical energy and recovered to the auxiliary power supply battery 805 on the target vehicle.

[0142] Another embodiment of the present application further provides an electric vehicle, Fig. 9 A schematic diagram of the structure of an electric vehicle provided in an embodiment of the present application is shown in FIG. Fig. 9 As shown, the vehicle includes the energy recovery control system 800 and the electric vehicle body 900 .

[0143] Based on the same inventive concept, a vehicle energy recovery device corresponding to the vehicle energy recovery method is also provided in the embodiment of the present application. Since the principle of solving the problem by the device in the embodiment of the present application is similar to the above-mentioned vehicle energy recovery method in the embodiment of the present application, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0144] Fig.10 A schematic diagram of the structure of an electric vehicle energy recovery device provided in an embodiment of the present application is shown in FIG. Fig.10 As shown, the device comprises:

[0145] The first control module 1001 is used to control the motor loaded on the drive axle of the target vehicle to convert the fuel cell on the target vehicle into mechanical energy in the driving mode to provide driving force for the target vehicle when the target vehicle is in the driving state;

[0146] The second control module 1002 is used to control the motor to switch from the driving mode to the energy recovery mode if the target vehicle switches from the driving state to the braking state, and in the energy recovery mode, the vehicle kinetic energy during the braking process of the target vehicle is converted into electrical energy and recovered to the auxiliary power supply battery on the target vehicle;

[0147] An acquisition module 1003 is used to acquire a power state parameter of the auxiliary power supply battery in an energy recovery mode;

[0148] The determination module 1004 is used to determine whether the auxiliary power supply battery is in a saturated state according to the power state parameter of the auxiliary power supply battery;

[0149] The third control module 1005 is used to control the energy recovery path between the motor and the auxiliary power supply battery to be disconnected if the auxiliary power supply battery is in a saturated state, and control the power supply path between the motor and the target power load corresponding to the auxiliary power supply battery to be opened.

[0150] In a possible implementation manner, the state of charge parameter package: a state of charge parameter or a battery capacity parameter, and the determination module 1004 is specifically used to: determine whether the state of charge parameter is greater than or equal to a preset saturated state of charge parameter;

[0151] If the state of charge parameter is greater than or equal to the preset saturated state of charge parameter, it is determined that the auxiliary power supply battery is in a saturated state of charge;

[0152] If the state of charge parameter is less than the preset saturated state of charge parameter, it is determined that the auxiliary power supply battery is not in a saturated state of charge;

[0153] Alternatively, determining whether a battery capacity parameter is greater than or equal to a preset saturated battery capacity parameter;

[0154] If the battery capacity parameter is greater than or equal to the preset saturated battery capacity parameter, it is determined that the auxiliary power supply battery is in a saturated state;

[0155] If the battery capacity parameter is less than the preset saturated battery capacity parameter, it is determined that the auxiliary power supply battery is not in a saturated state.

[0156] In a possible implementation manner, the target power load includes at least: a first power load, and a monitoring sensor is provided on a first power supply path between the motor and the first power load; a third control module 1005, specifically used to: control the first power supply path to be turned on;

[0157] In a possible implementation manner, the third control module 1005 is further used to: obtain a power supply state parameter on the first power supply path collected by the monitoring sensor;

[0158] According to the power supply state parameters, it is determined whether the first power load meets the preset safety protection condition; wherein the first power load includes: an electric heating element.

[0159] If the first electrical load meets the preset safety protection condition, the first power supply path is controlled to be disconnected.

[0160] In a possible implementation, the monitoring sensor includes: a voltage sensor, and the power supply state parameter includes: a voltage parameter; the third control module 1005 is specifically used to: determine whether the voltage parameter is greater than or equal to a preset heating voltage threshold;

[0161] If the voltage parameter is greater than or equal to the preset heating voltage threshold, it is determined that the electric heating element meets the preset safety protection condition;

[0162] If the voltage parameter is less than the preset heating voltage threshold, it is determined that the electric heating element does not meet the preset safety protection condition.

[0163] In a possible implementation, the monitoring sensor includes: a current sensor, and the power supply state parameter includes: a current parameter; a third control module 1005, specifically used to: determine whether the current parameter is greater than or equal to a preset heating current threshold;

[0164] If the current parameter is greater than or equal to the preset heating current threshold, it is determined that the electric heating element meets the preset safety protection condition;

[0165] If the current parameter is less than the preset heating current threshold, it is determined that the electric heating element does not meet the preset safety protection condition.

[0166] In a possible implementation manner, the third control module 1005 is specifically configured to: if the heating function corresponding to the electric heating element is in an on state, control the power supply path between the motor and the electric heating element to be turned on.

[0167] In a possible implementation manner, the electric heating element is a columnar electric heating wire made of a nickel-chromium alloy with high resistivity, and the electric heating element is evenly distributed inside the bottom plate of the target vehicle.

[0168] For descriptions of the processing flow of each module in the device and the interaction flow between each module, reference may be made to the relevant descriptions in the above method embodiment, which will not be described in detail here.

[0169] An embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned electric vehicle energy recovery method are executed.

[0170] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the method embodiment, and will not be repeated in this application. In the several embodiments provided in this application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation. For example, multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0171] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or part of the technical solution that contributes to the prior art or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, RandomAccess Memory), disk or optical disk and other media that can store program code.

[0172] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application.

Claims

1. A method for energy recovery of an electric vehicle, characterized in that: The method comprises: When the target vehicle is in a driving state, controlling the motor mounted on the drive axle of the target vehicle to convert the fuel cell on the target vehicle into mechanical energy in a driving mode to provide driving force for the target vehicle; If the target vehicle switches from a driving state to a braking state, the motor is controlled to switch from the driving mode to an energy recovery mode, in which the vehicle kinetic energy during the braking process of the target vehicle is converted into electrical energy and recovered into an auxiliary power supply battery on the target vehicle; Acquire the power state parameter of the auxiliary power supply battery in the energy recovery mode; Determining whether the auxiliary power supply battery is in a saturated state according to the power state parameter of the auxiliary power supply battery; If the auxiliary power supply battery is in the power saturation state, the energy recovery path between the motor and the auxiliary power supply battery is controlled to be disconnected, and the power supply path between the motor and the target power load corresponding to the auxiliary power supply battery is controlled to be opened.

2. The method according to claim 1, characterized in that The state of charge parameter package: state of charge parameter or battery capacity parameter, wherein determining whether the auxiliary power supply battery is in a saturated state of charge according to the state of charge parameter of the auxiliary power supply battery includes: Determining whether the state of charge parameter is greater than or equal to a preset saturated state of charge parameter; If the state of charge parameter is greater than or equal to the preset saturated state of charge parameter, it is determined that the auxiliary power supply battery is in a saturated state of charge; If the state of charge parameter is less than the preset saturated state of charge parameter, determining that the auxiliary power supply battery is not in a saturated state of charge; Alternatively, determining whether the battery capacity parameter is greater than or equal to a preset saturated battery capacity parameter; If the battery capacity parameter is greater than or equal to the preset saturated battery capacity parameter, it is determined that the auxiliary power supply battery is in a saturated state; If the battery capacity parameter is less than the preset saturated battery capacity parameter, it is determined that the auxiliary power supply battery is not in a saturated state.

3. The method according to claim 1, characterized in that The target power load includes at least: a first power load, and a monitoring sensor is provided on a first power supply path between the motor and the first power load; and the control of opening the power supply path between the motor and the target power load corresponding to the auxiliary power supply battery includes: Controlling the first power supply path to be turned on; wherein the first power load comprises: an electric heating element; The method further comprises: Acquire power supply status parameters on the first power supply path collected by the monitoring sensor; Determining whether the first power load meets a preset safety protection condition according to the power supply status parameter; If the first electrical load meets a preset safety protection condition, the first power supply path is controlled to be disconnected.

4. The method according to claim 3, characterized in that The monitoring sensor includes: a voltage sensor, and the power supply status parameter includes: a voltage parameter; Determining whether the first power load meets a preset safety protection condition according to the power supply state parameter includes: determining whether the voltage parameter is greater than or equal to a preset heating voltage threshold; If the voltage parameter is greater than or equal to the preset heating voltage threshold, it is determined that the electric heating element meets the preset safety protection condition; If the voltage parameter is less than the preset heating voltage threshold, it is determined that the electric heating element does not meet the preset safety protection condition.

5. The method according to claim 3, characterized in that: The monitoring sensor further comprises: a current sensor, and the power supply state parameter comprises: a current parameter; Determining whether the first power load meets a preset safety protection condition according to the power supply state parameter includes: Determining whether the current parameter is greater than or equal to a preset heating current threshold; If the current parameter is greater than or equal to the preset heating current threshold, it is determined that the electric heating element meets the preset safety protection condition; If the current parameter is less than the preset heating current threshold, it is determined that the electric heating element does not meet the preset safety protection condition.

6. The method according to claim 3, characterized in that The controlling the power supply path between the motor and the target power load corresponding to the auxiliary power supply battery to be opened includes: If the heating function corresponding to the electric heating element is in an on state, the power supply path between the motor and the electric heating element is controlled to be turned on.

7. The method according to claim 3, characterized in that The electric heating element is a columnar electric heating wire made of a nickel-chromium alloy with high resistivity, and the electric heating element is evenly distributed inside the bottom plate of the target vehicle.

8. A control device, characterized in that: The control device includes: a processor and a memory, wherein the memory stores machine-readable instructions executable by the processor, and when the server is running, the processor executes the machine-readable instructions to perform the steps of the electric vehicle energy recovery method described in any one of claims 1-7.

9. An energy recovery control system, characterized in that: The energy recovery control system includes: a control device, a motor arranged on an electric drive bridge, a fuel cell, an auxiliary power supply battery, a first switch and a second switch; The driving end of the motor is used to connect to the driving shaft, the first power end of the motor is connected to the fuel cell, the second power end of the motor is connected to the auxiliary power supply battery, the second power end of the motor is also used to connect to the target power load, a first switch is provided on the energy recovery path between the second power end of the motor and the auxiliary power supply battery, and a second switch is provided on the power supply path between the second power end of the motor and the target power load; The control device is connected to the control end of the motor, the auxiliary power supply battery, the first switch and the second switch, and the control device is used to execute the steps of the electric vehicle energy recovery method described in any one of claims 1-7 above.

10. An electric vehicle, characterized in that: The vehicle comprises the energy recovery control system according to claim 9 and a vehicle body.

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