A control method, system, device, medium and vehicle of a hybrid electric vehicle

Abstract

The present application relates to the technical field of series-parallel hybrid electric vehicle, and particularly relates to a control method, system, device, medium and vehicle of a hybrid electric vehicle. Driving parameter information in a pure electric driving mode is acquired, and whether a condition for converting a working mode to a series driving mode is met is determined according to the driving parameter information. If the condition for converting the working mode to the series driving mode is met, the pure electric driving mode is converted to the series driving mode. A temperature value of a transmission oil temperature in the series driving mode is acquired, and if the temperature value meets a condition for converting the working mode to the pure electric driving mode, the series driving mode is converted to the pure electric driving mode. In the present application, the pure electric driving mode is converted to the series driving mode in a low-temperature environment, which can prevent a large drag torque in the low-temperature environment and the engine from being dragged to rotate, so that the engine can be prevented from being dragged to a resonance speed interval to cause abnormal noise of the vehicle and improve the driving experience.

Description

Technical Field

[0001] This invention relates to the field of series-parallel hybrid electric vehicle technology, and more particularly to a control method, system, device, medium, and vehicle for hybrid electric vehicles. Background Technology

[0002] Thanks to advancements in battery technology and cost reductions, as well as the widespread availability of charging stations, most hybrid vehicles equipped with series-parallel hybrid systems are currently powered by large-capacity batteries with ample charge, providing a certain pure electric driving range and frequently operating in pure electric drive mode. However, the wet clutches or brakes used in the shifting actuators of series-parallel hybrid systems are typically mechanically connected to the drive motor via a transmission system. They rotate along with the drive motor, and when there is a speed difference between the driving and driven ends, a drag torque is generated. Due to this drag torque, the engine in a series-parallel hybrid system tends to be pulled up and rotate during pure electric driving. The more gears there are, the more shifting actuators are required, resulting in a greater drag torque and a higher likelihood of the engine being unexpectedly pulled up. If the engine speed is dragged to the resonance range, it can cause vehicle vibration, abnormal noises, and other problems, affecting the driving experience. Therefore, improving the driving experience of series-parallel hybrid systems in low-temperature pure electric drive mode is a pressing issue that needs to be addressed. Summary of the Invention

[0003] Therefore, it is necessary to provide a control method, system, device, medium, and vehicle for hybrid electric vehicles to address the aforementioned technical problems and solve the issue of low driving experience in low-temperature pure electric drive mode of series-parallel hybrid electric systems.

[0004] A first aspect of this application provides a control method for a hybrid electric vehicle, the control method comprising:

[0005] Obtain the vehicle's current operating mode;

[0006] When the operating mode is pure electric drive mode, the drive parameter information in pure electric drive mode is obtained, and based on the drive parameter information, it is determined whether the conditions for converting the operating mode to series drive mode are met.

[0007] If the conditions for converting the operating mode to the series drive mode are met, then the pure electric drive mode is converted to the series drive mode.

[0008] Obtain the temperature value of the transmission oil under the series drive mode, and determine whether the temperature value meets the conditions for switching the working mode to pure electric drive mode;

[0009] If the temperature value meets the conditions for switching the operating mode to pure electric drive mode, then the series drive mode is switched to pure electric drive mode.

[0010] A second aspect of this application provides a control system for a hybrid electric vehicle, the control system comprising:

[0011] The acquisition module is used to obtain the vehicle's current operating mode;

[0012] The first judgment module is used to obtain drive parameter information in the pure electric drive mode when the working mode is the pure electric drive mode, and to determine whether the conditions for converting the working mode to the series drive mode are met based on the drive parameter information.

[0013] The first conversion module is used to convert the pure electric drive mode to the series drive mode if the conditions for converting the working mode to the series drive mode are met.

[0014] The second judgment module is used to obtain the temperature value of the transmission oil in the series drive mode and determine whether the temperature value meets the conditions for switching the working mode to pure electric drive mode.

[0015] The second conversion module is used to convert the series drive mode into a pure electric operating mode if the temperature value meets the conditions for converting the operating mode into a pure electric drive mode.

[0016] A third aspect of this application provides an optical computer device, the computer device including a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the control method described in the first aspect.

[0017] A fourth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the control method described in the first aspect. The vehicle includes the control system described in the second aspect.

[0018] A fifth aspect of this application provides a vehicle that includes the control system of a hybrid electric vehicle as described in the second aspect above.

[0019] The advantages of this invention compared to the prior art are:

[0020] The system obtains the vehicle's current operating mode. When the operating mode is pure electric drive mode, it obtains the drive parameter information in pure electric drive mode. Based on the drive parameter information, it determines whether the conditions for switching the operating mode to series drive mode are met. If the conditions for switching the operating mode to series drive mode are met, the pure electric drive mode is switched to series drive mode. The system also obtains the transmission oil temperature value in series drive mode and determines whether the temperature value meets the conditions for switching the operating mode to pure electric drive mode. If the temperature value meets the conditions for switching the operating mode to pure electric drive mode, the series drive mode is switched to pure electric drive mode. In this application, switching from pure electric drive mode to series drive mode in low-temperature environments can prevent the engine from being dragged and turned due to the large drag torque at low temperatures. This avoids the engine being dragged to the resonance speed range, causing abnormal noises in the vehicle and improving the driving experience. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a flowchart illustrating a control method for a hybrid electric vehicle provided in Embodiment 1 of the present invention;

[0023] Figure 2 This is a flowchart illustrating a control method for a hybrid electric vehicle provided in Embodiment 2 of the present invention;

[0024] Figure 3 This is a flowchart illustrating a control method for a hybrid electric vehicle provided in Embodiment 3 of the present invention;

[0025] Figure 4 This is a schematic flowchart of a control method for a hybrid electric vehicle provided in Embodiment 4 of the present invention;

[0026] Figure 5 This is a structural block diagram of a hybrid electric vehicle control system provided in Embodiment 5 of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of a computer device provided in Embodiment Six of the present invention;

[0028] Figure 7 This is a schematic diagram of a vehicle provided in Embodiment 7 of the present invention. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0031] It should also be understood that the term “and / or” as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0032] As used in this specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0033] Furthermore, in the description of this invention and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of the invention include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0035] It should be understood that the sequence number of each step in the following embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0036] To illustrate the technical solution of the present invention, specific embodiments are described below. These embodiments are applicable to the control of hybrid electric vehicles. The hybrid electric vehicle control method can be executed by a hybrid electric vehicle control device, which can be implemented in hardware and / or software and can be configured within the hybrid electric vehicle. Hybrid electric vehicles are classified into three types: first, series hybrid electric vehicles (SHEVs), which mainly consist of an engine, generator, and drive motor connected in series to form the hybrid electric vehicle's power system; second, parallel hybrid electric vehicles (PHEVs), where both the engine and drive motor are powertrains, and the power of the two powertrains can be superimposed or output independently; and third, parallel hybrid electric vehicles (PSHEVs), which combine the structures of series and parallel hybrid electric vehicles and mainly consist of an engine, an electric motor-generator, and a drive motor.

[0037] See Figure 1 This is a flowchart illustrating a control method for a hybrid electric vehicle provided in Embodiment 1 of the present invention, as shown below. Figure 1 As shown, the control method for this hybrid vehicle may include the following steps.

[0038] S101: Obtain the current operating mode of the vehicle.

[0039] In step S101, the current operating mode of the vehicle is obtained. The operating mode is the operating mode under the hybrid vehicle, which may include pure electric drive mode, series drive mode and parallel drive mode. The pure electric drive mode is the mode in which the power battery provides power to the vehicle.

[0040] This embodiment is applicable to the control of hybrid vehicles in pure electric drive mode. In pure electric drive mode, the power battery provides electrical energy to the drive motor, which drives the vehicle. If the drive motor's electrical energy comes solely from the power battery, the vehicle is considered to be in pure electric drive mode. If the drive motor's electrical energy is provided by other actuators, the vehicle is considered not to be in pure electric drive mode.

[0041] The pure electric drive mode is a mode in which the engine is not working, the generator is not working, and the drive motor is in a driving mode.

[0042] In this embodiment, the pure electric drive mode is a mode in which the engine and generator are not working, and the drive motor is in a driving mode. That is, the drive motor is powered by the power battery, and the torque output by the drive motor drives the wheels. The current working state of the vehicle is considered to be the pure electric drive mode.

[0043] It should be noted that when the engine is running, the engine drives the generator to produce electrical energy, which is then supplied to the drive motor, causing the drive motor to output torque to drive the wheels. The vehicle is considered to be in series drive mode at the moment of operation.

[0044] It should be noted that the engine drives the generator to produce electrical energy, and at the same time, the torque output by the engine drives the wheels. That is, the engine drives the generator to generate electricity and provides drive for the wheels at the same time. The current working state of the vehicle is considered to be parallel drive mode.

[0045] S102: If the working mode is pure electric drive mode, obtain the drive parameter information in pure electric drive mode, and determine whether the conditions for converting the working mode to series drive mode are met based on the drive parameter information.

[0046] In step S102, if the working mode is pure electric drive mode, the drive parameter information in pure electric drive mode is obtained. Based on the drive parameter information, it is determined whether the conditions for converting the working mode to series drive mode are met. The drive parameter information in pure electric drive mode can be the information on the magnitude of the torque generated by the driven end to the driving end. In series drive mode, the engine drives the generator to generate electricity, which provides electrical energy to the drive motor. The electrical energy is used to drive the drive motor, which then drives the wheels.

[0047] In this embodiment, after determining that the vehicle's operating mode is pure electric drive mode, the power battery provides power to the vehicle. At this time, the engine and generator are not operating, and the drive motor rotates. The rotation of the drive motor causes the driven end of the clutch to rotate, creating a speed difference between the driven and driving ends of the clutch. This speed difference between the driven and driving ends creates a shearing effect on the hydraulic fluid, generating a torque on the driving end, which tends to drive the driving end to rotate as well. Since the driving end of the clutch is connected to the engine and generator, the rotation of the driving end tends to drive the engine and generator to rotate. When the torque generated by the clutch is large, it will drive the engine and generator to rotate.

[0048] Based on the drive parameter information, it is determined whether the conditions for switching the operating mode to series drive mode are met. Specifically, this is determined by the magnitude of the torque generated by the driven end on the driving end. When the engine and generator reach their resonance range, it can cause vehicle vibration, abnormal noises, and other problems, affecting the driving experience. Switching to series drive mode is to reduce vibration. Therefore, when the torque generated by the driven end on the driving end exceeds a preset torque threshold, it is assumed that the rotation of the clutch driving end can drive the engine and generator to rotate, and the engine and generator reach their resonance range. Thus, it is determined whether the conditions for switching to series drive mode are met, i.e., whether the magnitude of the torque generated by the driven end on the driving end in the drive parameter information exceeds the preset torque threshold.

[0049] See Figure 2 This is a flowchart illustrating a control method for a hybrid electric vehicle provided in Embodiment 2 of the present invention, as shown below. Figure 2 As shown, the steps involve determining whether the conditions for switching the operating mode to a series drive mode are met based on the drive parameter information, including:

[0050] S201: Determine whether the temperature value of the transmission oil in pure electric drive mode is less than the first preset threshold.

[0051] S202: If the temperature of the transmission oil is less than the first preset threshold in pure electric drive mode, then determine whether the engine speed is greater than the first speed threshold.

[0052] S203: If the engine speed is greater than the first speed threshold, then the condition for switching the operating mode to series drive mode is met.

[0053] In this embodiment, the drive parameter information includes the temperature value of the transmission oil and the engine speed in pure electric drive mode. Based on the drive parameter information, it is determined whether the conditions for converting the working mode to the series drive mode are met. That is, based on the temperature value of the transmission oil and the engine speed in pure electric drive mode, it is determined whether the conditions for converting the working mode to the series drive mode are met.

[0054] In this embodiment, since the temperature of the transmission fluid can affect the torque by which the drive motor drives the engine and generator to rotate, when the temperature of the transmission fluid is low, the torque by which the drive motor drives the engine and generator to rotate is large, and when the temperature of the transmission fluid is high, the torque by which the drive motor drives the engine and generator to rotate is small. Therefore, it is determined whether the temperature of the transmission fluid in the pure electric drive mode is less than a first preset threshold. When the temperature of the transmission fluid in the pure electric drive mode is less than the first preset threshold, it is considered that the torque by which the drive motor drives the engine and generator to rotate is large, and the rotation of the drive motor can drive the engine and generator to rotate.

[0055] If the transmission oil temperature is less than a first preset threshold in pure electric drive mode, the engine speed is checked to see if it exceeds a first speed threshold. If the engine speed exceeds the first speed threshold, the condition for switching the operating mode to series drive mode is met. Checking if the engine speed exceeds the first speed threshold means checking if the engine speed has reached the resonance range. If it has, it is believed that this may lead to vehicle vibration, abnormal noises, and other problems, affecting the driving experience. Therefore, if the engine speed exceeds the first speed threshold, the condition for switching the operating mode to series drive mode is met to prevent the engine speed from causing vehicle vibration, abnormal noises, and other problems that could affect the driving experience.

[0056] See Figure 3 This is a flowchart illustrating a control method for a hybrid electric vehicle provided in Embodiment 3 of the present invention. Figure 3 As shown, after determining whether the transmission oil temperature is less than the first preset threshold in pure electric drive mode, the process further includes:

[0057] S301: If the temperature of the transmission oil is less than the first preset threshold in pure electric drive mode, then determine whether the speed of the generator is greater than the second speed threshold.

[0058] S302: If the generator speed is greater than the second speed threshold, then the condition for switching the operating mode to series drive mode is met.

[0059] In this embodiment, the drive parameter information also includes the generator speed. If the transmission oil temperature is less than a first preset threshold in pure electric drive mode, it is determined whether the generator speed is greater than a second speed threshold. That is, after determining that the rotation of the drive motor can drive the engine and generator to rotate, it is determined whether the generator speed is greater than the second speed threshold. If the generator speed is greater than the second speed threshold, it is determined that the condition for switching the working mode to series drive mode is met. Determining whether the generator speed is greater than the second speed threshold means determining whether the generator speed has reached the resonance range. If it has reached the resonance range, it is considered that it may cause vehicle vibration, abnormal noise, and other problems, affecting the driving experience. Therefore, if the generator speed is greater than the second speed threshold, it is determined that the condition for switching the working mode to series drive mode is met. That is, if the generator speed is greater than the second speed threshold, the working mode is switched to series drive mode to prevent the generator speed from causing vehicle vibration, abnormal noise, and other problems that affect the driving experience.

[0060] S103: If the conditions for converting the operating mode to the series drive mode are met, then the pure electric drive mode will be converted to the series drive mode.

[0061] In step S103, if the conditions for converting the working mode to the series drive mode are met, that is, in the pure electric drive mode, the temperature value of the transmission oil is less than the first preset threshold, and the engine speed is greater than the first speed threshold or the generator speed is greater than the second speed threshold, then the pure electric drive mode is converted to the series drive mode. In the series drive mode, the engine drives the generator to generate electricity, which provides electrical energy to the drive motor. The electrical energy is used to drive the drive motor, so that the drive motor drives the wheels.

[0062] In this embodiment, if the conditions for switching the operating mode to a series drive mode are met, the vehicle's operating mode is changed, switching from pure electric drive mode to series drive mode. In series drive mode, the engine drives the generator to work, and the engine drives the generator to generate electricity, providing power to the drive motor. The drive motor is then driven by this electricity, preventing the drive motor from driving the engine and generator to rotate.

[0063] See Figure 4 This is a flowchart illustrating a control method for a hybrid electric vehicle provided in Embodiment 4 of the present invention, as shown below. Figure 4 As shown, the steps to convert the pure electric drive mode to a series drive mode include:

[0064] S401: Converts the operating state of the engine and generator to working;

[0065] S402: Keep the drive motor in drive mode.

[0066] In this embodiment, the pure electric drive mode is converted to a series drive mode, that is, the working state of the engine and generator is changed to working, the generator is used as the power source to drive the generator to generate electricity, and provide electrical energy to the drive motor, so that the working state of the drive motor is kept in drive mode, thereby driving the corresponding vehicle to run.

[0067] S104: Obtain the temperature value of the transmission oil in the series drive mode, and determine whether the temperature value meets the conditions for switching the working mode to pure electric drive mode.

[0068] In step S104, after the operating mode is switched to series drive mode, the oil temperature in the transmission of the vehicle's hybrid system will gradually increase. After the temperature increases, the operating mode can be switched back to series drive mode.

[0069] In this embodiment, the temperature value of the transmission oil in the series drive mode is obtained. If the temperature value reaches a certain requirement, the friction between the driving end and the driven end of the clutch will decrease. In the pure electric drive mode, the rotation of the drive motor will not drive the rotation of the engine and generator. Therefore, the working mode can be switched to the pure electric drive mode based on the temperature value of the transmission oil in the series drive mode.

[0070] S105: If the temperature value meets the conditions for switching the working mode to pure electric drive mode, then the series drive mode will be switched to pure electric drive mode.

[0071] In step S105, if the temperature value meets the condition for converting the working mode to the pure electric drive mode, then the series drive mode is converted to the pure electric drive mode. The condition for the temperature value to meet the condition for converting the working mode to the pure electric drive mode is that the temperature value is greater than a preset temperature value.

[0072] In this embodiment, if the temperature value is greater than the preset temperature value, it is considered that the temperature value meets the condition for switching the working mode to the pure electric drive mode. Then, the series drive mode is switched to the pure electric drive mode so that the vehicle can be driven by the pure electric drive mode.

[0073] Optionally, switching from series drive mode to pure electric drive mode includes:

[0074] Control the engine to shut down, thus changing the generator's operating state to non-operation.

[0075] In this embodiment, when switching from series drive mode to pure electric drive mode, the engine is shut off so that it cannot provide power to the generator. Therefore, the engine is controlled to shut down, and the generator's operating state is changed to non-operation. At this time, the vehicle is driven by the drive motor.

[0076] The system obtains the vehicle's current operating mode. When the operating mode is pure electric drive mode, it acquires the drive parameter information under pure electric drive mode. Based on the drive parameter information, it determines whether the conditions for switching the operating mode to series drive mode are met. If the conditions for switching the operating mode to series drive mode are met, then the pure electric drive mode is switched to series drive mode. The system also acquires the transmission oil temperature value under series drive mode and determines whether the temperature value meets the conditions for switching the operating mode to pure electric drive mode. If the temperature value meets the conditions for switching the operating mode to pure electric drive mode, then the series drive mode is switched to pure electric drive mode. In this application, switching from pure electric drive mode to series drive mode in low-temperature environments can prevent the engine from being dragged and turned due to the large drag torque at low temperatures. This avoids the engine being dragged to the resonance speed range, causing abnormal noises in the vehicle, and improves the driving experience.

[0077] See Figure 5 , Figure 5 This is a structural block diagram of a hybrid electric vehicle control system according to Embodiment 5 of the present invention. For ease of explanation, only the parts related to the embodiments of the present invention are shown. See also Figure 5 The control system 50 includes:

[0078] Module 51 is used to obtain the current operating mode of the vehicle;

[0079] The first judgment module 52 is used to obtain the drive parameter information in the pure electric drive mode when the working mode is the pure electric drive mode, and determine whether the conditions for converting the working mode to the series drive mode are met based on the drive parameter information.

[0080] The first conversion module 53 is used to convert the pure electric drive mode to the series drive mode if the conditions for converting the working mode to the series drive mode are met.

[0081] The second judgment module 54 is used to obtain the temperature value of the transmission oil in the series drive mode and determine whether the temperature value meets the conditions for switching the working mode to the pure electric drive mode.

[0082] The second conversion module 55 is used to convert the series drive mode to the pure electric operating mode if the temperature value meets the conditions for converting the operating mode to the pure electric drive mode.

[0083] Optionally, the first determination module 52 mentioned above includes:

[0084] The first judgment unit is used to determine whether the temperature value of the transmission oil in pure electric drive mode is less than the first preset threshold.

[0085] The second judgment unit is used to determine whether the engine speed is greater than the first speed threshold if the temperature value of the transmission oil is less than the first preset threshold in pure electric drive mode.

[0086] The second determining unit is used to determine if the engine speed is greater than the first speed threshold, that the conditions for switching the operating mode to the series drive mode are met.

[0087] Optionally, the first determination module 52 mentioned above includes:

[0088] The third judgment unit is used to determine whether the speed of the generator is greater than the second speed threshold if the temperature value of the transmission oil is less than the first preset threshold in pure electric drive mode.

[0089] The third determining unit is used to determine if the generator speed is greater than the second speed threshold, and if so, that the condition for switching the operating mode to the series drive mode is met.

[0090] Optionally, the first conversion module 53 mentioned above includes:

[0091] The conversion unit is used to switch the operating status of the engine and generator to the working status;

[0092] The drive unit is used to maintain the drive motor in a driving state.

[0093] It should be noted that the information interaction and execution process between the above modules are based on the same concept as the method embodiments of the present invention. For details on their specific functions and technical effects, please refer to the method embodiments section, which will not be repeated here.

[0094] Figure 6 This is a schematic diagram of the structure of a computer device provided in Embodiment Six of the present invention. Figure 6 As shown, the computer device of this embodiment includes: at least one processor ( Figure 6 Only one is shown in the diagram), a memory, and a computer program stored in the memory and executable on at least one processor. When the processor executes the computer program, it implements the control methods for any of the aforementioned hybrid electric vehicles, as well as the steps in the embodiments of the calculation methods.

[0095] This computer device may include, but is not limited to, a processor and memory. Those skilled in the art will understand that... Figure 6 The examples of computer devices are merely examples and do not constitute a limitation on computer devices. Computer devices may include more or fewer components than shown in the illustration, or combinations of certain components, or different components, such as network interfaces.

[0096] The processor referred to can be a CPU, but it can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0097] Memory includes readable storage media, internal memory, etc., wherein internal memory can be the RAM of a computer device, providing an environment for the operation of the operating system and computer-readable instructions stored in the readable storage media. The readable storage media can be the hard drive of a computer device, or in other embodiments, it can be an external storage device of the computer device, such as a plug-in hard drive, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card. Furthermore, memory can include both internal storage units and external storage devices of a computer device. Memory is used to store the operating system, applications, bootloader, data, and other programs, such as program code for computer programs. Memory can also be used to temporarily store data that has been output or will be output.

[0098] Those skilled in the art will understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is used as an example. In practical applications, the functions described above can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this invention. The specific working process of the units and modules in the above device can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here. If the integrated unit is implemented as 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 present invention can implement all or part of the processes in the methods of the above embodiments by instructing related hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the above method embodiments. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. A computer-readable medium can include at least: any entity or device capable of carrying computer program code, a recording medium, a computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media. Examples include USB flash drives, portable hard drives, magnetic disks, or optical disks. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electrical carrier signals or telecommunication signals.

[0099] The present invention can implement all or part of the processes in the methods of the above embodiments, or it can be accomplished by a computer program product. When the computer program product is run on a computer device, the computer device executes the steps in the above method embodiments.

[0100] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0101] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0102] In the embodiments provided by this invention, it should be understood that the disclosed apparatus / computer devices and methods can be implemented in other ways. For example, the apparatus / computer device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0103] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0104] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

[0105] See Figure 7 , Figure 7 This is a schematic diagram of a vehicle provided in Embodiment 7 of the present invention. The vehicle 70 includes a control system 50.

Claims

1. A control method for a hybrid electric vehicle, characterized in that, The control method includes: Obtain the vehicle's current operating mode; When the operating mode is pure electric drive mode, the drive parameter information in pure electric drive mode is obtained, and based on the drive parameter information, it is determined whether the conditions for converting the operating mode to series drive mode are met. If the conditions for switching the operating mode to a series drive mode are met, then the pure electric drive mode is switched to a series drive mode; the drive parameter information includes the transmission oil temperature and engine speed in the pure electric drive mode. The step of determining whether the conditions for switching the operating mode to a series drive mode are met based on the drive parameter information includes: Determine whether the temperature of the transmission oil in pure electric drive mode is less than a first preset threshold; the first preset threshold is the low temperature critical value at which the rotation of the drive motor drives the engine and generator to rotate. If the temperature of the transmission oil in pure electric drive mode is less than a first preset threshold, then it is determined whether the engine speed is greater than a first speed threshold; the first speed threshold is the lower limit of the engine resonance critical speed. If the engine speed is greater than the first speed threshold, then the condition for switching the operating mode to the series drive mode is met. Obtain the temperature value of the transmission oil under the series drive mode, and determine whether the temperature value meets the conditions for switching the working mode to pure electric drive mode; If the temperature value meets the conditions for switching the operating mode to pure electric drive mode, then the series drive mode is switched to pure electric drive mode.

2. The control method as described in claim 1, characterized in that, The drive parameter information also includes the generator speed; The step of determining whether the transmission oil temperature in pure electric drive mode is less than the first preset threshold also includes: If the temperature value of the transmission oil in the pure electric drive mode is less than the first preset threshold, then determine whether the speed of the generator is greater than the second speed threshold. If the generator's rotational speed is greater than the second rotational speed threshold, then the condition for switching the operating mode to a series drive mode is met.

3. The control method as described in claim 1, characterized in that, The pure electric drive mode is a mode in which the engine is not working, the generator is not working, and the drive motor is in a driving mode.

4. The control method as described in claim 3, characterized in that, The step of converting the pure electric drive mode to a series drive mode includes: Convert the operating state of the engine and the generator to working; The operating state of the drive motor is kept in drive mode.

5. The control method as described in claim 4, characterized in that, The step of converting the series drive mode to a pure electric drive mode includes: The engine is shut down, thus changing the generator's operating state to non-operation.

6. A control system for a hybrid electric vehicle, characterized in that, The control system includes: The acquisition module is used to obtain the vehicle's current operating mode; The first judgment module is used to obtain drive parameter information in the pure electric drive mode when the working mode is the pure electric drive mode, and to determine whether the conditions for converting the working mode to the series drive mode are met based on the drive parameter information. The first conversion module is used to convert the pure electric drive mode to the series drive mode if the conditions for converting the working mode to the series drive mode are met; the drive parameter information includes the temperature value of the transmission oil and the engine speed in the pure electric drive mode. The step of determining whether the conditions for switching the operating mode to a series drive mode are met based on the drive parameter information includes: Determine whether the temperature of the transmission oil in pure electric drive mode is less than a first preset threshold; the first preset threshold is the low temperature critical value at which the rotation of the drive motor drives the engine and generator to rotate. If the temperature of the transmission oil in pure electric drive mode is less than a first preset threshold, then it is determined whether the engine speed is greater than a first speed threshold; the first speed threshold is the lower limit of the engine resonance critical speed. If the engine speed is greater than the first speed threshold, then the condition for switching the operating mode to the series drive mode is met. The second judgment module is used to obtain the temperature value of the transmission oil in the series drive mode and determine whether the temperature value meets the conditions for switching the working mode to pure electric drive mode. The second conversion module is used to convert the series drive mode into a pure electric operating mode if the temperature value meets the conditions for converting the operating mode into a pure electric drive mode.

7. A computer device, characterized in that, The computer device includes a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the control method as described in any one of claims 1 to 5.

8. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the control method as described in any one of claims 1 to 5.

9. A vehicle, characterized in that, The vehicle includes the control system as described in claim 6.

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