Control method, device and equipment of hybrid electric vehicle and medium

Abstract

The invention discloses a control method, device and equipment for a hybrid electric vehicle and a medium, and the method comprises the step that when a power battery cannot work normally, it is guaranteed that the power battery is disconnected from a connected main relay. And the power and the required torque of the low-voltage load of the hybrid electric vehicle are obtained, and the target power is determined. And determining a target rotating speed of the engine based on the target power and the preset efficiency, and controlling the engine to operate at the target rotating speed. And determining a target current of the generator based on the target power, and controlling the generator to operate at the target current. And controlling a driving motor to operate based on the demand torque so as to drive the hybrid electric vehicle. And controlling the DC / DC converter to be in a step-down circuit mode, and controlling the generator to supply power to the low-voltage load through the DC / DC converter. The engine is controlled to drive the generator to operate, and electric energy is provided for the low-voltage load and the driving motor of the hybrid electric vehicle, so that normal operation of the hybrid electric vehicle in a full-speed state is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of vehicle control technology, and in particular to a control method, device, equipment and medium for a hybrid electric vehicle. Background Art

[0002] A hybrid vehicle is a vehicle whose vehicle drive system is composed of two or more single drive systems that can operate simultaneously. The vehicle's driving power can be provided by a single drive system alone or together depending on the actual vehicle driving state.

[0003] As part of the power source of hybrid vehicles, the power battery can provide power to the drive motor to drive the vehicle. It can also provide power to the high-voltage electrical equipment of the vehicle to ensure the normal operation of high-voltage electrical equipment, such as the electric compressor of the air conditioner, PTC electric heater, etc. And when the 12V battery of the hybrid vehicle is insufficient, the power battery can convert the high-voltage electricity into low-voltage electricity through the DC-DC converter to charge the 12V battery, and provide power to the low-voltage electrical equipment of the vehicle, such as wipers, instruments, etc.

[0004] For hybrid vehicles whose engines cannot drive them alone in the full speed range, the power battery is required to provide power to the drive motor when running at low speeds to drive the hybrid vehicle. When the power battery fails or fails to work due to other reasons, the normal operation of the hybrid vehicle will be affected. Summary of the invention

[0005] In view of this, the present application provides a control method, device, equipment and medium for a hybrid electric vehicle, so as to achieve normal operation of the hybrid electric vehicle when the power battery cannot operate normally.

[0006] In a first aspect, the present application provides a control method for a hybrid electric vehicle, the method comprising:

[0007] In response to the operation of disconnecting the power battery of the hybrid vehicle from the connected main relay, obtaining the power and required torque of the low-voltage load of the hybrid vehicle;

[0008] determining a target power based on the power of the low-voltage load and the required torque;

[0009] determining a target speed of the engine based on the target power and a preset efficiency, and controlling the engine to operate at the target speed, wherein the preset efficiency represents a ratio between the output power of the engine and the output power of the generator;

[0010] Determining a target current of the generator based on the target power, and controlling the generator to operate at the target current, wherein the engine is used to drive the generator to operate and generate electricity;

[0011] Controlling the operation of the drive motor based on the required torque to drive the hybrid vehicle;

[0012] The DC / DC converter is controlled to be in a step-down circuit mode, and the generator is controlled to supply power to the low-voltage load through the DC / DC converter.

[0013] In a possible implementation, the step of obtaining the required torque of the hybrid vehicle includes:

[0014] Acquiring a current accelerator pedal signal of the hybrid electric vehicle;

[0015] The required torque is determined based on a correlation between an accelerator pedal signal and the required torque and based on the current accelerator pedal signal.

[0016] In a possible implementation, determining the target speed of the engine based on the target power and the preset efficiency includes:

[0017] determining the output power of the engine based on the target power and the preset efficiency;

[0018] The current output torque of the engine is acquired, and the target speed is determined based on the output power of the engine and the current output torque of the engine.

[0019] In a possible implementation, the operation of disconnecting the main relay includes one or more of the following:

[0020] The main relay is disconnected from the power battery after a failure occurs; or,

[0021] In response to a failure of the power battery, the main relay is controlled to disconnect from the power battery.

[0022] In a possible implementation, before obtaining the power and required torque of the low-voltage load of the hybrid vehicle, the method further includes:

[0023] Controlling the high-voltage load of the hybrid vehicle to stop running;

[0024] The engine is controlled to operate in an idle condition.

[0025] In a possible implementation, the acquiring the power of the low-voltage load of the hybrid electric vehicle includes:

[0026] Acquiring a voltage signal and a current signal corresponding to the low-voltage load;

[0027] The power of the low-voltage load is determined based on the voltage signal and the current signal.

[0028] In a second aspect, the present application provides a control device for a hybrid vehicle, the device comprising:

[0029] an acquisition unit, for acquiring the power and required torque of a low-voltage load of the hybrid vehicle in response to an operation of disconnecting a power battery of the hybrid vehicle from a connected main relay;

[0030] a first determining unit, configured to determine a target power based on the power of the low-voltage load and the required torque;

[0031] a second determining unit, configured to determine a target speed of the engine based on the target power and a preset efficiency; a first control unit, configured to control the engine to operate at the target speed, the preset efficiency representing a ratio between the output power of the engine and the output power of the generator;

[0032] a third determining unit, configured to determine a target current of the generator based on the target power; a second control unit, configured to control the generator to operate at the target current, and the engine to drive the generator to operate and generate electricity;

[0033] a third control unit, configured to control the operation of the drive motor based on the required torque to drive the hybrid vehicle;

[0034] The fourth control unit is used to control the DC / DC converter to be in a step-down circuit mode; the second control unit is also used to control the generator to supply power to the low-voltage load through the DC / DC converter.

[0035] In a possible implementation, the acquisition unit is specifically configured to acquire a current accelerator pedal signal of the hybrid vehicle; determine the required torque based on a correlation between the accelerator pedal signal and the required torque, and based on the current accelerator pedal signal.

[0036] In one possible implementation, the second determination unit is specifically used to determine the output power of the engine based on the target power and the preset efficiency; obtain the current output torque of the engine, and determine the target speed based on the output power of the engine and the current output torque of the engine.

[0037] In a possible implementation, the operation of disconnecting the main relay includes one or more of the following:

[0038] The main relay is disconnected from the power battery after a failure occurs; or, in response to a failure of the power battery, the main relay is controlled to be disconnected from the power battery.

[0039] In a possible implementation, the device further includes: a fifth control unit;

[0040] Before obtaining the power and required torque of the low-voltage load of the hybrid vehicle, the fifth control unit is used to control the high-voltage load of the hybrid vehicle to stop running;

[0041] The second control unit is also used to control the engine to operate in an idle condition.

[0042] In a possible implementation, the acquisition unit is specifically configured to acquire a voltage signal and a current signal corresponding to the low-voltage load; and determine the power of the low-voltage load based on the voltage signal and the current signal.

[0043] In a third aspect, the present application provides a control device for a hybrid electric vehicle, the device comprising: a memory and a processor;

[0044] The memory is used to store relevant program codes;

[0045] The processor is used to call the program code to execute the control method of the hybrid vehicle described in any one of the implementations of the first aspect.

[0046] In a fourth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium is used to store a computer program, and the computer program is used to execute the control method of the hybrid vehicle described in any one of the implementations of the first aspect above.

[0047] It can be seen that this application has the following beneficial effects:

[0048] In the above implementation of the present application, when the hybrid vehicle is running in a low speed range, only the power battery can provide power to the drive motor, and the engine cannot drive the vehicle. When the power battery cannot work properly, ensure that the power battery is disconnected from the connected main relay. Then obtain the power and required torque of the low-voltage load of the hybrid vehicle. Determine the required target power based on the power and required torque of the low-voltage load. Determine the target speed of the engine based on the target power and the preset efficiency, and control the engine to run at the target speed, wherein the preset efficiency represents the ratio between the output power of the engine and the output power of the generator. Determine the target current of the generator based on the target power, and control the generator to run at the target current, wherein the engine is used to drive the generator to run for power generation. Control the drive motor to run based on the required torque to drive the hybrid vehicle. Control the DC / DC converter to a step-down circuit mode, and control the generator to power the low-voltage load through the DC / DC converter. Through the above method, the engine can be controlled to drive the generator to run, and provide power to the low-voltage load and the drive motor of the hybrid vehicle to ensure the normal operation of the hybrid vehicle at full vehicle speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. It is obvious that the drawings described below are only some embodiments provided in the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0050] Figure 1 A schematic diagram of a transmission mechanism of a hybrid vehicle provided in an embodiment of the present application;

[0051] Figure 2 A flow chart of a control method for a hybrid vehicle provided in an embodiment of the present application;

[0052] Figure 3 A flow chart of another hybrid vehicle control method provided in an embodiment of the present application;

[0053] Figure 4 A schematic diagram of a control device for a hybrid vehicle provided in an embodiment of the present application;

[0054] Figure 5 A schematic diagram of a main oil pressure control device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. The described embodiments are only exemplary implementation methods of the present application, not all implementation methods. Those skilled in the art can combine the embodiments of the present application to obtain other embodiments without creative work, and these embodiments are also within the scope of protection of the present application.

[0056] As part of the power source of hybrid vehicles, the power battery can provide power to the drive motor in pure electric mode to drive the vehicle. It can also provide power to the high-voltage electrical equipment of the vehicle to ensure the normal operation of high-voltage electrical equipment, such as the electric compressor of the air conditioner, PTC electric heater, etc. And when the 12V battery of the hybrid vehicle is insufficient, the power battery can convert the high voltage electricity into low voltage electricity through the DC-DC converter to charge the 12V battery, and provide power to the low-voltage electrical equipment of the vehicle, such as wipers, instruments, etc.

[0057] For hybrid vehicles whose engines cannot drive them alone in the full speed range, the power battery is required to provide power to the drive motor when running at low speeds to drive the hybrid vehicle. When the power battery fails or fails to work due to other reasons, the normal operation of the hybrid vehicle will be affected.

[0058] See also Figure 1 , which is a schematic diagram of a transmission mechanism of a hybrid electric vehicle provided in an embodiment of the present application. The transmission mechanism includes an engine 101, a generator 102, a drive motor 103, a shock absorber 104, a shift component 105 and a drive component 106. The engine 101 is connected to the shift component through the shock absorber 104. The shock absorber 104 can reduce the abnormal vibration caused by the operation of the transmission system in which the engine is located, so as to improve the noise, vibration and harshness (NVH) performance of the vehicle. The gear can be changed by moving the shift component 105 left and right. The drive motor 103 can drive the wheels to operate through the drive component 106 to realize the driving operation of the hybrid electric vehicle. It should be noted that the generator 102 and the drive motor 103 are essentially motors. By controlling different operating modes of the motors, the driving function of the engine and the power generation function of the generator can be realized.

[0059] The transmission mechanism has two gears, and the engine can drive the gear shift in these two ways to control the hybrid vehicle to run in different gears. However, when the hybrid vehicle is running at a low speed, for example, lower than the lowest speed at which the engine can continue to operate, since there is no clutch to gradually drive the vehicle's speed through slipping, the engine cannot drive the gear to drive a stationary or low-speed vehicle, which will cause the engine to stall. At low speeds, hybrid vehicles can only use the power battery to power the drive motor to drive the hybrid vehicle. Therefore, for hybrid vehicles whose engines cannot be driven alone within the full speed range, when the power battery fails or fails to work for other reasons, it will affect the normal operation of the hybrid vehicle.

[0060] Based on this, the embodiment of the present application provides a control method for a hybrid vehicle so as to achieve normal operation of the hybrid vehicle when the power battery cannot work properly. In specific implementation, when the hybrid vehicle is running in a low speed range, only the power battery can provide power to the drive motor, and the engine cannot drive the vehicle. When the power battery cannot work properly, ensure that the power battery is disconnected from the connected main relay. Then obtain the power and required torque of the low-voltage load of the hybrid vehicle. Determine the required target power based on the power and required torque of the low-voltage load. Determine the target speed of the engine based on the target power and the preset efficiency, and control the engine to run at the target speed, wherein the preset efficiency represents the ratio between the output power of the engine and the output power of the generator. Determine the target current of the generator based on the target power, and control the generator to run at the target current, wherein the engine is used to drive the generator to run for power generation. Control the drive motor to run based on the required torque to drive the hybrid vehicle. Control the DC / DC converter to a step-down circuit mode, and control the generator to power the low-voltage load through the DC / DC converter. Through the above method, when the power battery cannot work properly, the engine can be controlled to drive the generator to run, and provide power to the low-voltage load and the drive motor of the hybrid vehicle to ensure the normal operation of the hybrid vehicle at full vehicle speed.

[0061] In order to facilitate the understanding of the technical solution provided by the embodiments of the present application, a detailed introduction will be given below with reference to the accompanying drawings.

[0062] See also Figure 2 , Figure 2 A flow chart of a control method for a hybrid vehicle provided in an embodiment of the present application.

[0063] The method can be executed by a controller of a hybrid vehicle. For example, it can be executed by a vehicle control unit (VCU). As the central control unit of a hybrid vehicle, the vehicle control unit VCU can collect power battery status, pedal signals, actuator and sensor signals, make corresponding judgments based on comprehensive analysis of the driver's intention, and monitor the actions of the lower-level component controllers to ensure the normal operation of the vehicle.

[0064] The method may include the following steps:

[0065] S201: In response to the operation of disconnecting the power battery of the hybrid vehicle from the connected main relay, obtaining the power and required torque of the low-voltage load of the hybrid vehicle.

[0066] When the power battery cannot work properly, before controlling the operation of the hybrid vehicle through other control methods, it is necessary to ensure that the power battery is disconnected from the connected main relay. For example, if the power battery itself fails to work properly, if the power battery is normally connected to the main relay, the subsequent generator may supply power to the power battery through the high-voltage circuit, which may cause the faulty power battery to burn out the circuit and cause danger. Therefore, the VCU controls the main relay to disconnect from the power battery. If the power battery cannot supply power because the main relay fails and disconnects from the power battery, it is ensured that the main relay is disconnected from the power battery, and subsequent control operations can be performed.

[0067] In a possible implementation, since the power battery cannot work normally, in order to ensure the safety of the high-voltage circuit, the high-voltage load can be unloaded. For example, the VCU can send a control signal to the high-voltage load to control the high-voltage load to stop running.

[0068] When the main relay is disconnected, the initial power generation of the generator is controlled to be 0. If the engine is not started at this time, the VCU can control the engine to start running. If the engine has already started running, the VCU needs to control the engine to unload torque and enter the idle state, that is, it is in an idling state without outputting torque to avoid the engine running away when the generator does not output power.

[0069] When the power battery fails to work properly, the engine can be controlled to drive the generator to generate electricity to meet the power required by the vehicle. When the hybrid vehicle is running at a low speed, the power of the low-voltage load and the required torque of the vehicle can be obtained, so that the power required by the vehicle can be determined based on the low-voltage complex power and the required torque of the vehicle.

[0070] In a possible implementation, the VCU may obtain a voltage signal and a current signal corresponding to the low-voltage load, and thus may determine the power of the low-voltage load according to the voltage signal and the current signal.

[0071] When determining the required torque of the whole vehicle, it can be achieved in the following way: the VCU can obtain the current accelerator pedal signal of the hybrid vehicle at this time, and then determine the required torque based on the correlation between the accelerator pedal signal and the required torque and the current accelerator pedal signal. That is, there is a corresponding correlation between the required torque and the accelerator pedal signal, and the VCU can store the correlation in advance, so that after obtaining the current accelerator pedal signal, the required torque associated with the current accelerator pedal signal can be determined according to the correlation.

[0072] In a possible implementation, the association between the hybrid vehicle at different gears, vehicle speed, accelerator pedal opening and required torque can be pre-stored. When determining the required torque, the current gear, vehicle speed and accelerator pedal opening of the hybrid vehicle can be obtained, so as to determine the current required torque based on the association.

[0073] S202: Determine the target power based on the power of the low-voltage load and the required torque.

[0074] Once the power and required torque of the low-voltage load are determined, the target power required by the vehicle can be determined. The target power is the power that the generator needs to output when generating electricity to meet the normal operation of the hybrid vehicle.

[0075] Specifically, the VCU can obtain the wheel speed through the wheel speed sensor, and then determine the required power according to the speed and the required torque. For example, required power = speed x required torque / coefficient.

[0076] S203: Determine a target speed of the engine based on the target power and the preset efficiency, and control the engine to run at the target speed.

[0077] There is a connection between the engine and the generator. When the engine drives the generator to operate, the generator can generate back electromotive force, thereby generating electricity. There is a loss between the output power of the engine and the output power of the generator, so there is a proportional relationship between the output power of the engine and the output power of the generator, that is, the preset efficiency. For example, when the output power of the engine is 10kw and the output power of the generator is 8kw, the preset efficiency between the engine and the generator is 0.8. That is, the output power of the generator = the output power of the engine x the preset efficiency.

[0078] After determining the target power, that is, the output power of the generator, the output power of the engine can be determined based on the ratio between the target power and the preset efficiency. The VCU can then collect the current output torque signal of the engine and obtain the output torque, so that the target speed of the engine can be determined based on the output power of the engine and the current output torque. The VCU can then control the operation of the engine based on the target speed. For example, the VCU can send a speed control signal to the engine controller, and the speed control signal includes the target speed of the engine, so that the engine controller controls the output torque of the engine based on the speed control signal, controls the engine to run at the target speed, and realizes closed-loop control.

[0079] S204: Determine a target current of the generator based on the target power, and control the generator to operate at the target current.

[0080] In practical applications, in order to make the generator run normally, it is necessary to control the voltage of the generator within a preset range. For example, the voltage of the generator of a hybrid vehicle is generally in the range of 300V-400V. When the generator is running, since it is necessary to control the output power of the generator to reach the target power and ensure that the voltage of the generator is within the preset range, the output power of the generator can be changed by controlling the current of the generator. That is, the VCU can send the target power to the generator controller, and the generator controller determines the target current of the generator based on the target power and voltage, and controls the generator to run at the target current.

[0081] S205: Control the operation of the drive motor based on the required torque to drive the hybrid vehicle.

[0082] After the required torque is determined, the VCU can send a torque request to the drive motor so that the drive motor outputs the required torque to drive the hybrid vehicle to operate.

[0083] The principle of the drive motor is to convert electrical energy into mechanical energy. The generator can provide the required electrical energy for the drive motor. After being converted into mechanical energy, the wheels are driven by the rotation of the drive motor. When current is generated inside the drive motor, the current generates a magnetic field force inside the drive motor. The drive motor has a rotor and a stator inside. There are permanent magnets or electromagnetic coils on the rotor, and there are electromagnetic coils on the stator. When the current passes through the electromagnetic coil on the stator, a magnetic field is generated. This magnetic field interacts with the permanent magnets or electromagnetic coils on the rotor, causing the rotor to start rotating. The rotation of the rotor drives the wheels to rotate, thereby realizing the driving of the hybrid vehicle. Therefore, the VCU can change the output torque of the drive motor by changing the current inside the drive motor, thereby controlling the drive motor to output the required torque to drive the hybrid vehicle. For example, the VCU can send the required torque to the drive motor controller, and the drive motor controller changes the current inside the drive motor to change the output torque.

[0084] S206: Control the DC / DC converter to a step-down circuit mode, and control the generator to supply power to the low-voltage load through the DC / DC converter.

[0085] When the power battery fails to work properly, the 12V battery in the hybrid vehicle can temporarily power the low-voltage load. However, the 12V battery has limited power, so the generator can be used to generate electricity to power the low-voltage load. In specific implementation, the voltage output by the generator is AC, which can be first converted to DC through an inverter. At this time, the DC voltage is high and cannot directly power the low-voltage load. The DC / DC converter connected to the generator can be controlled to a step-down circuit mode, for example, a Buck circuit, that is, a higher input DC voltage is converted to a lower DC voltage so that the low-voltage load can be powered.

[0086] In addition, the electrical energy output by the generator can also charge the 12V battery so that the 12V battery can also provide electrical energy for low-voltage loads in other situations.

[0087] Through the method provided in the embodiment of the present application, when the power battery cannot work normally, it cannot provide power for the hybrid vehicle to run at low speed. The engine can be controlled to drive the generator to run, and power can be provided for the low-voltage load and drive motor of the hybrid vehicle to ensure the normal operation of the hybrid vehicle at full speed.

[0088] Based on the above method embodiment, the present application embodiment also provides a control method for a hybrid electric vehicle. Figure 3 , Figure 3 A flowchart of another hybrid vehicle control method provided in an embodiment of the present application.

[0089] The method may include the following steps:

[0090] S301: When the power battery cannot work normally, determine whether the power battery is disconnected from the main relay;

[0091] S302: If not, disconnect the power battery from the main relay;

[0092] S303: Determine whether the engine is in a running state;

[0093] S304: If yes, control the engine to enter idle operation; otherwise, start the engine to run;

[0094] S305: Obtaining power and required torque of a low-voltage load of the hybrid vehicle;

[0095] S306: determining a target power based on the power of the low-voltage load and the required torque;

[0096] S307: determining the output power of the engine based on the target power and the preset efficiency; determining the target speed according to the current output torque and output power of the engine, and controlling the engine to run at the target speed;

[0097] S308: determining a target current of the generator based on the target power, and controlling the generator to operate at the target current;

[0098] S309: Controlling the operation of the drive motor based on the required torque to drive the hybrid vehicle;

[0099] S310: Control the DC / DC converter to a step-down circuit mode, and control the generator to supply power to the low-voltage load through the DC / DC converter.

[0100] The beneficial effects of the method provided in the embodiments of the present application can be found in the above method embodiments and will not be described in detail here.

[0101] Based on the above method embodiment, the present application embodiment also provides a control device for a hybrid vehicle. Figure 4 , Figure 4 A schematic diagram of a control device for a hybrid vehicle provided in an embodiment of the present application.

[0102] The apparatus 400 may include:

[0103] An acquisition unit 401 is used to acquire the power and required torque of the low-voltage load of the hybrid vehicle in response to the operation of disconnecting the power battery of the hybrid vehicle from the connected main relay;

[0104] A first determining unit 402, configured to determine a target power based on the power of the low-voltage load and the required torque;

[0105] A second determining unit 403 is used to determine a target speed of the engine based on the target power and a preset efficiency;

[0106] A first control unit 404 is used to control the engine to run at the target speed, the preset efficiency represents the ratio between the output power of the engine and the output power of the generator;

[0107] A third determining unit 405, configured to determine a target current of the generator based on the target power;

[0108] A second control unit 406 is used to control the generator to operate at the target current, and the engine is used to drive the generator to operate and generate electricity;

[0109] A third control unit 407 is used to control the operation of the driving motor based on the required torque to drive the hybrid vehicle;

[0110] A fourth control unit 408, configured to control the DC / DC converter to a buck circuit mode;

[0111] The second control unit 406 is further configured to control the generator to supply power to the low-voltage load via the DC / DC converter.

[0112] In a possible implementation, the acquisition unit 401 is specifically configured to acquire a current accelerator pedal signal of the hybrid vehicle; determine the required torque based on a correlation between the accelerator pedal signal and the required torque, and based on the current accelerator pedal signal.

[0113] In a possible implementation, the second determination unit 403 is specifically used to determine the output power of the engine based on the target power and the preset efficiency; obtain the current output torque of the engine, and determine the target speed based on the output power of the engine and the current output torque of the engine.

[0114] In a possible implementation, the operation of disconnecting the main relay includes one or more of the following:

[0115] The main relay is disconnected from the power battery after a failure occurs; or, in response to a failure of the power battery, the main relay is controlled to be disconnected from the power battery.

[0116] In a possible implementation, the device further includes: a fifth control unit;

[0117] Before obtaining the power and required torque of the low-voltage load of the hybrid vehicle, the fifth control unit is used to control the high-voltage load of the hybrid vehicle to stop running;

[0118] The second control unit 406 is also used to control the engine to operate in an idle condition.

[0119] In a possible implementation, the acquisition unit 401 is specifically configured to acquire a voltage signal and a current signal corresponding to the low-voltage load; and determine the power of the low-voltage load based on the voltage signal and the current signal.

[0120] Based on the above method embodiment and device embodiment, the present application also provides a control device for a hybrid vehicle, which will be described below in conjunction with the accompanying drawings.

[0121] See also Figure 5 , Figure 5A schematic diagram of a control device for a hybrid vehicle provided in an embodiment of the present application.

[0122] The device 500 includes: a memory 501 and a processor 502;

[0123] The memory 501 is used to store relevant program codes;

[0124] The processor 502 is used to call the program code to execute the control method of the hybrid electric vehicle described in the above method embodiment.

[0125] In addition, an embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium is used to store a computer program, and the computer program is used to execute the control method of the hybrid vehicle described in the above method embodiment.

[0126] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can refer to each other. In particular, for the system or device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The device embodiment described above is only exemplary, in which the units or modules described as separate components may or may not be physically separated, and the components displayed as units or modules may or may not be physical modules, that is, they may be located in one place, or they may be distributed on multiple network units, and some or all of the units or modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.

[0127] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0128] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0129] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0130] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control method for a hybrid vehicle, characterized in that: The method comprises: In response to the operation of disconnecting the power battery of the hybrid vehicle from the connected main relay, obtaining the power and required torque of the low-voltage load of the hybrid vehicle; determining a target power based on the power of the low-voltage load and the required torque; determining a target speed of the engine based on the target power and a preset efficiency, and controlling the engine to operate at the target speed, wherein the preset efficiency represents a ratio between the output power of the engine and the output power of the generator; Determining a target current of the generator based on the target power, and controlling the generator to operate at the target current, wherein the engine is used to drive the generator to operate and generate electricity; Controlling the operation of the drive motor based on the required torque to drive the hybrid vehicle; The DC / DC converter is controlled to be in a step-down circuit mode, and the generator is controlled to supply power to the low-voltage load through the DC / DC converter.

2. The method according to claim 1, characterized in that The obtaining of the required torque of the hybrid vehicle comprises: Acquiring a current accelerator pedal signal of the hybrid electric vehicle; The required torque is determined based on a correlation between an accelerator pedal signal and the required torque and based on the current accelerator pedal signal.

3. The method according to claim 1, characterized in that The step of determining the target speed of the engine based on the target power and the preset efficiency comprises: determining the output power of the engine based on the target power and the preset efficiency; The current output torque of the engine is acquired, and the target speed is determined based on the output power of the engine and the current output torque of the engine.

4. The method according to any one of claims 1 to 3, characterized in that: The operation of disconnecting the power battery from the connected main relay includes one or more of the following: The main relay is disconnected from the power battery after a failure occurs; or, In response to a failure of the power battery, the main relay is controlled to disconnect from the power battery.

5. The method according to any one of claims 1 to 3, characterized in that: Before obtaining the power and required torque of the low-voltage load of the hybrid vehicle, the method further includes: Controlling the high-voltage load of the hybrid vehicle to stop running; The engine is controlled to operate in an idle condition.

6. The method according to claim 1, characterized in that The obtaining of the power of the low-voltage load of the hybrid electric vehicle comprises: Acquiring a voltage signal and a current signal corresponding to the low-voltage load; The power of the low-voltage load is determined based on the voltage signal and the current signal.

7. A control device for a hybrid vehicle, characterized in that: The device comprises: an acquisition unit, for acquiring the power and required torque of a low-voltage load of the hybrid vehicle in response to an operation of disconnecting a power battery of the hybrid vehicle from a connected main relay; a first determining unit, configured to determine a target power based on the power of the low-voltage load and the required torque; a second determining unit, configured to determine a target speed of the engine based on the target power and a preset efficiency; a first control unit, configured to control the engine to operate at the target speed, the preset efficiency representing a ratio between the output power of the engine and the output power of the generator; a third determining unit, configured to determine a target current of the generator based on the target power; a second controlling unit, configured to control the generator to operate at the target current, and the engine to drive the generator to operate and generate electricity; a third control unit, configured to control the operation of the drive motor based on the required torque to drive the hybrid vehicle; The fourth control unit is used to control the DC / DC converter to be in a step-down circuit mode; the second control unit is also used to control the generator to supply power to the low-voltage load through the DC / DC converter.

8. The device according to claim 7, characterized in that The acquisition unit is specifically used to acquire a current accelerator pedal signal of the hybrid vehicle; based on the correlation between the accelerator pedal signal and the required torque, and based on the current accelerator pedal signal, determine the required torque.

9. A control device for a hybrid vehicle, characterized in that: The device comprises: a memory and a processor; The memory is used to store relevant program codes; The processor is used to call the program code to execute the control method of the hybrid vehicle according to any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store a computer program, and the computer program is used to execute the control method of the hybrid vehicle according to any one of claims 1 to 6.

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