CN117261863A

CN117261863A - Hybrid electric vehicle power engine switching method and device, electronic equipment and storage medium

Info

Publication number: CN117261863A
Application number: CN202311434240.8A
Authority: CN
Inventors: 胡小倩; 陈轶; 师合迪; 周正伟
Original assignee: Chongqing Seres New Energy Automobile Design Institute Co Ltd
Current assignee: Chongqing Seres New Energy Automobile Design Institute Co Ltd
Priority date: 2023-10-31
Filing date: 2023-10-31
Publication date: 2023-12-22

Abstract

The disclosure provides a hybrid electric vehicle power engine switching method, a hybrid electric vehicle power engine switching device, electronic equipment and a storage medium. The method comprises the following steps: acquiring a running state and an operation instruction of the hybrid electric vehicle at the current moment, wherein the running state comprises speed, acceleration and steering wheel rotation angle; analyzing the operation instruction to obtain the running fluctuation quantity of the hybrid electric vehicle in a running state, wherein the running fluctuation quantity comprises the fluctuation quantity of each of the speed, the acceleration and the steering wheel rotation angle; judging whether the hybrid electric vehicle needs to switch a power engine or not based on the running state and the running fluctuation, wherein the power engine comprises an engine and a motor; when the power engine needs to be switched, the switching algorithm is utilized to finish the switching of the power engine. By adopting the technical means, the problem that the switching of the power engine of the hybrid electric vehicle is delayed from the change of the running state of the vehicle and the timely switching of the power engine cannot be realized in the prior art is solved.

Description

Hybrid electric vehicle power engine switching method and device, electronic equipment and storage medium

Technical Field

The disclosure relates to the technical field of automobiles, and in particular relates to a hybrid electric vehicle power engine switching method, a hybrid electric vehicle power engine switching device, electronic equipment and a storage medium.

Background

The hybrid vehicle has two power engines, an engine and a motor, respectively, which results in the hybrid vehicle being powered by both the engine and the motor, unlike other types of vehicles, so that switching of the two power engines is frequent for the hybrid vehicle. The current method for controlling the switching of the power engine of the hybrid electric vehicle is often based on a user instruction or preset, which causes the problem that the switching of the power engine of the hybrid electric vehicle is delayed from the change of the running state of the vehicle and the timely switching of the power engine cannot be realized.

Disclosure of Invention

In view of the above, the embodiments of the present disclosure provide a method, an apparatus, an electronic device, and a storage medium for switching power engines of a hybrid vehicle, so as to solve the problem in the prior art that the switching of the power engines of the hybrid vehicle is delayed from the change of the driving state of the vehicle, and the timely switching of the power engines cannot be achieved.

In a first aspect of an embodiment of the present disclosure, a method for switching power engines of a hybrid vehicle is provided, including: acquiring a running state and an operation instruction of the hybrid electric vehicle at the current moment, wherein the running state comprises speed, acceleration and steering wheel rotation angle; analyzing the operation instruction to obtain the running fluctuation quantity of the hybrid electric vehicle in a running state, wherein the running fluctuation quantity comprises the fluctuation quantity of each of the speed, the acceleration and the steering wheel rotation angle; judging whether the hybrid electric vehicle needs to switch a power engine or not based on the running state and the running fluctuation, wherein the power engine comprises an engine and a motor; when the power engine needs to be switched, the switching algorithm is utilized to finish the switching of the power engine.

In a second aspect of the embodiments of the present disclosure, there is provided a power engine switching device for a hybrid vehicle, including: the acquisition module is configured to acquire a running state and an operation instruction of the hybrid electric vehicle at the current moment, wherein the running state comprises speed, acceleration and steering wheel rotation angle; the analysis module is configured to analyze the operation instruction to obtain the running fluctuation quantity of the hybrid electric vehicle in a running state, wherein the running fluctuation quantity comprises the fluctuation quantity of each of the speed, the acceleration and the steering wheel rotation angle; a judging module configured to judge whether the hybrid vehicle needs to switch the power engine based on the running state and the running fluctuation amount, wherein the power engine includes an engine and a motor; and the switching module is configured to complete switching of the power engine by using a switching algorithm when the power engine needs to be switched.

In a third aspect of the disclosed embodiments, an electronic device is provided, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method as described above when executing the computer program.

In a fourth aspect of the disclosed embodiments, there is provided a computer readable storage medium storing a computer program which, when executed by a processor, performs the steps of the method of any one of the preceding claims.

Compared with the prior art, the beneficial effects of the embodiment of the disclosure at least comprise: the method comprises the steps of judging whether the hybrid electric vehicle needs to switch the power engine or not based on the running state and the running fluctuation, and when the power engine needs to be switched, completing the switching of the power engine by using a switching algorithm.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings that are required for the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.

Fig. 1 is a schematic flow chart of a method for switching power engines of a hybrid electric vehicle according to an embodiment of the disclosure;

FIG. 2 is a schematic flow chart of a method for calculating the torque and power required by an automobile according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a power engine switching device of a hybrid electric vehicle according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the disclosure.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc. in order to provide a thorough understanding of the disclosed embodiments. However, it will be apparent to one skilled in the art that the present disclosure may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present disclosure with unnecessary detail.

Fig. 1 is a schematic flow chart of a method for switching power engines of a hybrid electric vehicle according to an embodiment of the disclosure. The hybrid vehicle power engine switching method of fig. 1 may be executed by a computer or a server, or a processor provided on the computer or the server, or software on the computer or a general server. The method for switching the power engine of the hybrid electric vehicle comprises the following steps:

s101, acquiring a running state and an operation instruction of the hybrid electric vehicle at the current moment, wherein the running state comprises speed, acceleration and steering wheel rotation angle;

s102, analyzing an operation instruction to obtain the running fluctuation quantity of the hybrid electric vehicle in a running state, wherein the running fluctuation quantity comprises the fluctuation quantity of each of speed, acceleration and steering wheel rotation angle;

s103, judging whether the hybrid electric vehicle needs to switch a power engine or not based on the running state and the running fluctuation amount, wherein the power engine comprises an engine and a motor;

s104, when the power engine needs to be switched, the switching algorithm is utilized to finish the switching of the power engine.

It should be noted that, the operation instruction includes: the opening degree of the accelerator pedal and the duration of maintaining the opening degree, the rotation angle of the steering wheel newly increased from the original angle, and the like. Analyzing the operation command, wherein the change amount of the opening of the accelerator pedal (the opening of the accelerator pedal is newly increased in the original angle) corresponds to the change amount of the acceleration (the opening of each accelerator pedal corresponds to one acceleration, the difference between the two accelerations is equal to the change amount of the acceleration), the change amount of the speed corresponds to the opening of the accelerator pedal and the duration of maintaining the opening (the change amount v=at of the speed, a is the acceleration corresponding to the opening of the accelerator pedal, and t is the duration of maintaining the opening), and the rotation angle of the steering wheel newly increased in the original angle is equal to the change amount of each steering wheel rotation angle.

According to the technical scheme provided by the embodiment of the disclosure, the running state and the operation instruction of the hybrid electric vehicle at the current moment are obtained, wherein the running state comprises speed, acceleration and steering wheel rotation angle; analyzing the operation instruction to obtain the running fluctuation quantity of the hybrid electric vehicle in a running state, wherein the running fluctuation quantity comprises the fluctuation quantity of each of the speed, the acceleration and the steering wheel rotation angle; judging whether the hybrid electric vehicle needs to switch a power engine or not based on the running state and the running fluctuation, wherein the power engine comprises an engine and a motor; when the power engine needs to be switched, the switching algorithm is utilized to finish the switching of the power engine. By adopting the technical means, the problem that the switching of the power engine of the hybrid electric vehicle is delayed from the change of the running state of the vehicle and the timely switching of the power engine cannot be realized in the prior art can be solved, so that the problem of timely switching of the power engine of the hybrid electric vehicle is ensured, and the safety and comfort of the vehicle are improved.

Further, judging whether the hybrid vehicle needs to switch the power engine based on the running state and the running fluctuation amount includes: determining a power engine which needs to be used by the hybrid electric vehicle at the current moment based on the running state and the running fluctuation; when the power engine needed to be used by the hybrid electric vehicle at the current moment is inconsistent with the power engine used by the hybrid electric vehicle at the moment which is the last to the current moment, the power engine is determined to be needed to be switched by the hybrid electric vehicle.

For example, the engine is required to be used by the hybrid vehicle at the current moment according to the running state and the running fluctuation amount, and the motor is used by the hybrid vehicle at the moment which is the last moment of the current moment. For example, it is determined that the hybrid electric vehicle needs to use the electric motor at the current moment, and the hybrid electric vehicle uses the engine at the moment above the current moment, and because the power engine needed to be used by the hybrid electric vehicle at the current moment is inconsistent with the power engine used by the hybrid electric vehicle at the moment above the current moment, it can be determined that the hybrid electric vehicle needs to switch the power engine. Correspondingly, if the power engine needed to be used by the hybrid electric vehicle at the current moment is consistent with the power engine used by the hybrid electric vehicle at the moment which is the last to the current moment, the hybrid electric vehicle is determined to be unnecessary to switch the power engine.

Further, determining a power engine that the hybrid vehicle needs to use at the current time based on the running state and the running fluctuation amount includes: acquiring an engine characteristic curve and a motor characteristic curve of the hybrid electric vehicle; based on the driving state and the driving fluctuation amount, the power engine needed to be used by the hybrid vehicle at the current moment is determined through the engine characteristic curve and the motor characteristic curve.

The motor characteristic includes a motor torque-speed curve and a motor power-speed curve. Motor torque-speed curve: the curve depicts the maximum torque that the motor can provide at different speeds. In general, the motor has a larger torque at a low rotation speed, which is favorable for starting and accelerating the vehicle, and the torque gradually decreases with the increase of the rotation speed until the torque reaches the rated rotation speed to the minimum. Motor power-speed curve: the curve depicts the maximum power that the motor can provide at different speeds. The power of the motor increases with increasing rotational speed until a maximum power is reached when the rated rotational speed is reached.

The engine characteristic curves mainly include an engine torque-rotation speed curve and an engine power-rotation speed curve. Engine torque-speed curve: the curve depicts the maximum torque that the engine can provide at different speeds; in general, the engine has a small torque at a low speed, and the torque gradually increases with an increase in the rotational speed until the maximum torque is reached at the rated rotational speed. Engine power-speed curve: the curve depicts the maximum power that an internal combustion engine can provide at different rotational speeds; the power of the engine increases with increasing rotational speed, and reaches a maximum value when the rotational speed reaches a rated value.

Further, determining a power engine that the hybrid vehicle needs to use at the present time based on the running state and the running fluctuation amount by the engine characteristic curve and the motor characteristic curve, comprising: calculating target power required by the hybrid electric vehicle to finish running fluctuation under a running state; determining the maximum power which can be provided for the hybrid electric vehicle by the engine of the hybrid electric vehicle in a driving state through an engine characteristic curve, wherein the maximum power is recorded as first power; determining the maximum power which can be provided for the hybrid electric vehicle by the motor of the hybrid electric vehicle in a driving state through a motor characteristic curve, wherein the maximum power is recorded as second power; and determining a power engine which is needed to be used by the hybrid electric vehicle at the current moment based on the target power, the first power and the second power.

The target vehicle speed (the variation in speed plus the speed is equal to the target vehicle speed) may be determined based on the running state and the running variation, and the target rotation speed required for the hybrid vehicle to complete the running variation power engine in the running state may be determined based on the target vehicle speed. In general, the relationship between vehicle speed and rotational speed is as follows: vehicle speed = tyre circumference x transmission ratio/6000, the transmission ratio being the ratio of rotation between the motor and the driving wheel. And calculating the target torque required by the hybrid electric vehicle to finish the running fluctuation under the running state, wherein the product of the target rotating speed and the target torque is the target power.

The maximum power that can be provided for the hybrid vehicle at the rotational speed corresponding to the driving state (rotational speed corresponding to the speed in the driving state) of the engine of the hybrid vehicle is determined by the engine power-rotational speed curve, and is recorded as the first power. The maximum power that can be provided for the hybrid vehicle at the rotational speed corresponding to the driving state (rotational speed corresponding to the speed in the driving state) of the electric motor of the hybrid vehicle is determined by means of the motor power/rotational speed curve and is designated as the second power.

The power engine which is needed to be used by the hybrid electric vehicle at the current moment can be determined according to the magnitude relation among the target power, the first power and the second power. Illustrating: the target power required for the hybrid vehicle to complete the running fluctuation amount in the running state is 100kw. The maximum power that the engine of the hybrid vehicle can supply to the hybrid vehicle in the running state is 110kw, that is, the first power is 110kw. The maximum power that the electric motor of the hybrid vehicle can supply to the hybrid vehicle in the driving state is 90kw, that is, the second power is 90kw. In this case, the power engine that the hybrid vehicle needs to use at the present time is an engine. Because the target power is smaller than the first power but larger than the second power, the motor cannot provide sufficient power for the hybrid vehicle at the current moment, and the engine can provide sufficient power for the hybrid vehicle, only the engine can be used for providing power for the hybrid vehicle.

The power engine which is needed to be used by the hybrid vehicle at the current moment can be determined according to the target power and the difference value between the first power and the second power. Illustrating: the target power required for the hybrid vehicle to complete the running fluctuation amount in the running state is 100kw. The maximum power that the engine of the hybrid vehicle can supply to the hybrid vehicle in the running state is 130kw, that is, the first power is 130kw. The maximum power that the electric motor of the hybrid vehicle can supply to the hybrid vehicle in the driving state is 110kw, that is, the second power is 110kw. In this case, the power engine that the hybrid vehicle needs to use at the present time is an electric motor. Because the difference between the target power and the first power is larger than the difference between the target power and the second power, if the engine is used, power waste is caused, and energy conservation is not facilitated.

Further, determining a power engine that the hybrid vehicle needs to use at the present time based on the running state and the running fluctuation amount by the engine characteristic curve and the motor characteristic curve, comprising: calculating target torque required by the hybrid electric vehicle to finish running fluctuation under a running state; determining the maximum torque which can be provided for the hybrid electric vehicle by the engine of the hybrid electric vehicle in a driving state through an engine characteristic curve, wherein the maximum torque is recorded as first torque; determining the maximum torque which can be provided for the hybrid vehicle by the motor of the hybrid vehicle in a driving state through a motor characteristic curve, wherein the maximum torque is recorded as a second torque; and determining a power engine which is needed to be used by the hybrid electric vehicle at the current moment based on the target torque, the first torque and the second torque.

The maximum torque that can be provided by the hybrid vehicle at the rotational speed corresponding to the driving state (rotational speed corresponding to the speed in the driving state) of the engine of the hybrid vehicle is determined by the engine torque-rotational speed curve and is designated as the first torque. The maximum torque that can be provided by the electric motor of the hybrid vehicle at the rotational speed corresponding to the driving state (rotational speed corresponding to the speed in the driving state) is determined from the electric motor torque-rotational speed curve, and is recorded as the second torque.

The power engine that the hybrid vehicle needs to use at the present moment can be determined according to the magnitude relation between the target torque, the first torque and the second torque or the difference value. For example, the target torque is less than the first torque but greater than the second torque, then the hybrid vehicle requires the use of the engine at the current time. For example, if the difference between the target torque and the first torque is smaller than the difference between the target torque and the second torque, the hybrid vehicle needs to use the engine at the current moment.

The power engine which is needed to be used by the hybrid electric vehicle at the current moment can be determined according to the magnitude relation among the target torque, the first torque and the second torque. Illustrating: the target torque required for the hybrid vehicle to complete the running fluctuation amount in the running state is 300n·m. The maximum torque that the engine of the hybrid vehicle can provide for the hybrid vehicle in the running state is 350n·m, that is, the first torque is 350n·m. The maximum torque that the electric motor of the hybrid vehicle can provide for the hybrid vehicle in the running state is 280n·m, that is, the second torque is 280n·m. In this case, the power engine that the hybrid vehicle needs to use at the present time is an engine. Because the target torque is less than the first torque but greater than the second torque, the motor cannot provide sufficient torque for the hybrid vehicle at the current moment, and the engine can provide sufficient torque for the hybrid vehicle, only the engine can be used to provide torque for the hybrid vehicle.

The power engine that the hybrid vehicle needs to use at the current moment can be determined according to the difference between the target torque, the first torque and the second torque. Illustrating: the target torque required for the hybrid vehicle to complete the running fluctuation amount in the running state is 300n·m. The maximum torque that the engine of the hybrid vehicle can provide for the hybrid vehicle in the running state is 380n·m, that is, the first torque is 380n·m. The maximum torque that the electric motor of the hybrid vehicle can provide for the hybrid vehicle in the running state is 330n·m, that is, the second torque is 330n·m. In this case, the power engine that the hybrid vehicle needs to use at the present time is an electric motor. Because the difference between the target torque and the first torque is larger than the difference between the target torque and the second torque, if the engine is used, it causes a waste of torque, which is disadvantageous in energy saving.

Fig. 2 is a flow chart of a method for calculating torque required by an automobile and power required by the automobile according to an embodiment of the disclosure, as shown in fig. 2, including:

s201, determining uniform traction force required by uniform running of the hybrid vehicle based on the weight of the hybrid vehicle;

s202, calculating acceleration traction force required by accelerating the hybrid electric vehicle based on the weight, the acceleration and the fluctuation of the acceleration;

s203, calculating lateral traction force required by the hybrid vehicle to turn based on the weight, the speed, the fluctuation of the speed, the steering wheel rotation angle and the fluctuation of the steering wheel rotation angle;

s204, calculating target torque required by the hybrid electric vehicle to finish running fluctuation under a running state based on uniform-speed traction, acceleration traction and lateral traction;

s205, calculating a target rotating speed of the hybrid electric vehicle after the driving fluctuation amount is completed in a driving state;

s206, calculating the target power required by the hybrid electric vehicle to complete the running fluctuation under the running state according to the target torque and the target rotating speed.

The friction coefficient between the hybrid electric vehicle and the running road surface is determined, the product of the weight of the hybrid electric vehicle and the friction coefficient is the friction force which needs to be overcome when the hybrid electric vehicle runs on the running road surface at a constant speed, and the friction force is opposite to the constant-speed traction force in the same direction. The fluctuation of the acceleration is taken as the target acceleration, and the product of the target acceleration and the weight is taken as the acceleration traction force required by the acceleration of the hybrid vehicle. The turning radius r is calculated by the following formula, with the speed plus the fluctuation of the speed as the target speed, and the steering wheel rotation angle plus the fluctuation of the steering wheel rotation angle as the target angle: r=d/(2×tan (θ/2)), where d is the distance between the wheel axes and θ is the target angle. The lateral traction force F1 is calculated by the following formula: f1 =m×v×r, where m is equal to weight divided by gravitational acceleration and v represents the target speed. The sum of the uniform traction, the acceleration traction and the lateral traction is calculated, and the result is taken as a resultant force F2. The target torque τ is calculated by the following formula: τ=f2×l×sin β, L is the length of the moment arm, which is the rotation axis connecting the engine and the wheels, β is the angle between the direction of the resultant force and the direction of the moment arm. The product of the target torque and the target rotational speed is taken as the target power.

Further, when the power engine needs to be switched, the switching algorithm is used for completing the switching of the power engine, including: the power engine which is needed to be used at the current moment of the hybrid electric vehicle and the power engine which is used at the moment of the last moment of the current moment are respectively recorded as a first engine and a second engine; calculating a target rotating speed of the hybrid electric vehicle after the driving fluctuation is completed in a driving state; controlling the first engine and the second engine to enable the rotation speeds of the first engine and the second engine to be close to the target rotation speed; and when the difference value between the rotating speeds of the first engine and the second engine is smaller than a preset threshold value, switching the power engine of the hybrid electric vehicle from the second engine to the first engine.

The first engine and the second engine may be controlled (switched) a plurality of times to increase or decrease the rotational speeds of the first engine and the second engine so that the rotational speeds of the first engine and the second engine are both close to the target rotational speed. For example, the switching from the second engine to the first engine is completed through three times of switching, the rotating speed of the first engine is zero before the switching, the rotating speed of the second engine is the first rotating speed, and the target rotating speed is between zero and the first rotating speed. The first switching is performed, the first engine is controlled to increase the preset rotating speed to be changed into the second rotating speed, and the second engine is controlled to decrease the preset rotating speed to be changed into the third rotating speed; the second switching is performed, the first engine is controlled to increase the preset rotating speed to become the fourth rotating speed, the second engine is controlled to decrease the preset rotating speed to become the fifth rotating speed; and switching for the third time, controlling the first engine to increase the preset rotating speed to become a sixth rotating speed, and controlling the second engine to decrease the preset rotating speed to become a seventh rotating speed. After the third switching, the rotational speeds of the first engine and the second engine are the rotational speeds closest to the target rotational speed at present, and at the moment, the difference between the rotational speeds of the first engine and the second engine is smaller than a preset threshold value, and at the moment, the power engine of the hybrid electric vehicle is switched from the second engine to the first engine (the first engine can be increased according to the first preset rotational speed each time, and the second engine is reduced according to the second preset rotational speed each time, so that the rotational speeds of the two engines are close to the target rotational speed).

Any combination of the above-mentioned optional solutions may be adopted to form an optional embodiment of the present disclosure, which is not described herein in detail.

The following are device embodiments of the present disclosure that may be used to perform method embodiments of the present disclosure. For details not disclosed in the embodiments of the apparatus of the present disclosure, please refer to the embodiments of the method of the present disclosure.

Fig. 3 is a schematic diagram of a power engine switching device of a hybrid electric vehicle according to an embodiment of the disclosure. As shown in fig. 3, the hybrid vehicle power engine switching device includes:

an obtaining module 301, configured to obtain a running state and an operation instruction of the hybrid vehicle at the current moment, where the running state includes a speed, an acceleration, and a steering wheel rotation angle;

the analyzing module 302 is configured to analyze the operation instruction to obtain a running variation of the hybrid electric vehicle in a running state, wherein the running variation comprises respective variation of speed, acceleration and steering wheel rotation angle;

a judging module 303 configured to judge whether the hybrid vehicle needs to switch the power engine based on the running state and the running fluctuation amount, wherein the power engine includes an engine and a motor;

the switching module 304 is configured to complete switching of the power engine using a switching algorithm when switching of the power engine is required.

In some embodiments, the determining module 303 is further configured to determine a power engine that the hybrid vehicle needs to use at the current time based on the driving state and the driving variation; when the power engine needed to be used by the hybrid electric vehicle at the current moment is inconsistent with the power engine used by the hybrid electric vehicle at the moment which is the last to the current moment, the power engine is determined to be needed to be switched by the hybrid electric vehicle.

In some embodiments, the determination module 303 is further configured to obtain an engine characteristic and a motor characteristic of the hybrid vehicle; based on the driving state and the driving fluctuation amount, the power engine needed to be used by the hybrid vehicle at the current moment is determined through the engine characteristic curve and the motor characteristic curve.

In some embodiments, the determining module 303 is further configured to calculate a target power required for the hybrid vehicle to complete the driving variation in the driving state; determining the maximum power which can be provided for the hybrid electric vehicle by the engine of the hybrid electric vehicle in a driving state through an engine characteristic curve, wherein the maximum power is recorded as first power; determining the maximum power which can be provided for the hybrid electric vehicle by the motor of the hybrid electric vehicle in a driving state through a motor characteristic curve, wherein the maximum power is recorded as second power; and determining a power engine which is needed to be used by the hybrid electric vehicle at the current moment based on the target power, the first power and the second power.

In some embodiments, the determination module 303 is further configured to calculate a target torque required for the hybrid vehicle to complete the driving variation in the driving state; determining the maximum torque which can be provided for the hybrid electric vehicle by the engine of the hybrid electric vehicle in a driving state through an engine characteristic curve, wherein the maximum torque is recorded as first torque; determining the maximum torque which can be provided for the hybrid vehicle by the motor of the hybrid vehicle in a driving state through a motor characteristic curve, wherein the maximum torque is recorded as a second torque; and determining a power engine which is needed to be used by the hybrid electric vehicle at the current moment based on the target torque, the first torque and the second torque.

In some embodiments, the determination module 303 is further configured to determine a uniform traction force required for uniform travel of the hybrid vehicle based on the weight of the hybrid vehicle; calculating acceleration traction force required by accelerating the hybrid vehicle based on the weight, the acceleration and the fluctuation of the acceleration; calculating lateral traction force required by turning of the hybrid electric vehicle based on the weight, the speed, the fluctuation of the speed, the steering wheel rotation angle and the fluctuation of the steering wheel rotation angle; calculating target torque required by the hybrid electric vehicle to finish running fluctuation under a running state based on uniform-speed traction, acceleration traction and lateral traction; calculating a target rotating speed of the hybrid electric vehicle after the driving fluctuation is completed in a driving state; and calculating the target power required by the hybrid electric vehicle to finish the running fluctuation under the running state according to the target torque and the target rotating speed.

In some embodiments, the switching module 304 is further configured to record the power engine that the hybrid vehicle needs to use at the current time and the power engine that it uses at a time immediately preceding the current time as a first engine and a second engine, respectively; calculating a target rotating speed of the hybrid electric vehicle after the driving fluctuation is completed in a driving state; controlling the first engine and the second engine to enable the rotation speeds of the first engine and the second engine to be close to the target rotation speed; and when the difference value between the rotating speeds of the first engine and the second engine is smaller than a preset threshold value, switching the power engine of the hybrid electric vehicle from the second engine to the first engine.

It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic of each process, and should not constitute any limitation on the implementation process of the embodiments of the disclosure.

Fig. 4 is a schematic diagram of an electronic device 4 provided by an embodiment of the present disclosure. As shown in fig. 4, the electronic apparatus 4 of this embodiment includes: a processor 401, a memory 402 and a computer program 403 stored in the memory 402 and executable on the processor 401. The steps of the various method embodiments described above are implemented by processor 401 when executing computer program 403. Alternatively, the processor 401, when executing the computer program 403, performs the functions of the modules/units in the above-described apparatus embodiments.

The electronic device 4 may include, but is not limited to, a processor 401 and a memory 402. It will be appreciated by those skilled in the art that fig. 4 is merely an example of the electronic device 4 and is not limiting of the electronic device 4 and may include more or fewer components than shown, or different components.

The processor 401 may be a central processing unit (Central Processing Unit, CPU) or other general purpose processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), field programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The memory 402 may be an internal storage unit of the electronic device 4, for example, a hard disk or a memory of the electronic device 4. The memory 402 may also be an external storage device of the electronic device 4, for example, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card) or the like, which are provided on the electronic device 4. Memory 402 may also include both internal storage units and external storage devices of electronic device 4. The memory 402 is used to store computer programs and other programs and data required by the electronic device.

It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit.

The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present disclosure may implement all or part of the flow of the method of the above-described embodiments, or may be implemented by a computer program to instruct related hardware, and the computer program may be stored in a computer readable storage medium, where the computer program, when executed by a processor, may implement the steps of the method embodiments described above. The computer program may comprise computer program code, which may be in source code form, object code form, executable file or in some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the content of the computer readable medium can be appropriately increased or decreased according to the requirements of the jurisdiction's jurisdiction and the patent practice, for example, in some jurisdictions, the computer readable medium does not include electrical carrier signals and telecommunication signals according to the jurisdiction and the patent practice.

The above embodiments are merely for illustrating the technical solution of the present disclosure, and are not limiting thereof; although the present disclosure has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the disclosure, and are intended to be included in the scope of the present disclosure.

Claims

1. The power engine switching method of the hybrid electric vehicle is characterized by comprising the following steps of:

acquiring a running state and an operation instruction of the hybrid electric vehicle at the current moment, wherein the running state comprises speed, acceleration and steering wheel rotation angle;

analyzing the operation instruction to obtain the running fluctuation quantity of the hybrid electric vehicle in the running state, wherein the running fluctuation quantity comprises the fluctuation quantity of each of speed, acceleration and steering wheel rotation angle;

judging whether the hybrid electric vehicle needs to switch a power engine or not based on the running state and the running fluctuation amount, wherein the power engine comprises an engine and a motor;

and when the power engine needs to be switched, the switching algorithm is utilized to finish the switching of the power engine.

2. The method according to claim 1, wherein determining whether the hybrid vehicle requires switching of a power engine based on the running state and the running fluctuation amount, comprises:

determining a power engine which is needed to be used by the hybrid electric vehicle at the current moment based on the running state and the running fluctuation quantity;

and when the power engine needed to be used by the hybrid electric vehicle at the current moment is inconsistent with the power engine used by the hybrid electric vehicle at the moment which is the last to the current moment, determining that the power engine of the hybrid electric vehicle needs to be switched.

3. The method according to claim 2, wherein determining a power engine that the hybrid vehicle needs to use at a current time based on the running state and the running fluctuation amount, comprises:

acquiring an engine characteristic curve and a motor characteristic curve of the hybrid electric vehicle;

and determining a power engine which is required to be used by the hybrid vehicle at the current moment through the engine characteristic curve and the motor characteristic curve based on the running state and the running fluctuation amount.

4. The method according to claim 3, characterized in that determining a power engine that the hybrid vehicle needs to use at the present time by the engine characteristic curve and the motor characteristic curve based on the running state and the running fluctuation amount, comprises:

calculating target power required by the hybrid electric vehicle to complete the running fluctuation under the running state;

determining the maximum power which can be provided for the hybrid electric vehicle by the engine of the hybrid electric vehicle in the driving state through the engine characteristic curve, wherein the maximum power is recorded as first power;

determining a maximum power which can be provided for the hybrid vehicle by the motor of the hybrid vehicle in the driving state by means of the motor characteristic curve, wherein the maximum power is denoted as a second power;

and determining a power engine which is needed to be used by the hybrid electric vehicle at the current moment based on the target power, the first power and the second power.

5. The method according to claim 3, characterized in that determining a power engine that the hybrid vehicle needs to use at the present time by the engine characteristic curve and the motor characteristic curve based on the running state and the running fluctuation amount, comprises:

calculating a target torque required by the hybrid electric vehicle to complete the running fluctuation under the running state;

determining a maximum torque which can be provided by the engine of the hybrid vehicle in the driving state for the hybrid vehicle through the engine characteristic curve, wherein the maximum torque is recorded as a first torque;

determining a maximum torque which can be provided by the motor of the hybrid vehicle for the hybrid vehicle in the driving state by means of the motor characteristic curve, wherein the maximum torque is designated as a second torque;

and determining a power engine which is needed to be used by the hybrid electric vehicle at the current moment based on the target torque, the first torque and the second torque.

6. The method according to claim 4 or 5, characterized in that the method further comprises:

determining uniform traction force required by uniform running of the hybrid electric vehicle based on the weight of the hybrid electric vehicle;

calculating acceleration traction force required by the acceleration of the hybrid vehicle based on the weight, the acceleration and the fluctuation amount of the acceleration;

calculating lateral traction force required by the hybrid vehicle to turn on the basis of the weight, the speed, the fluctuation amount of the speed, the steering wheel rotation angle and the fluctuation amount of the steering wheel rotation angle;

calculating target torque required by the hybrid electric vehicle to complete the running fluctuation under the running state based on uniform-speed traction, acceleration traction and lateral traction;

calculating a target rotating speed of the hybrid electric vehicle after the running fluctuation amount is completed in the running state;

and calculating the target power required by the hybrid electric vehicle to complete the running fluctuation under the running state according to the target torque and the target rotating speed.

7. The method of claim 1, wherein when a switchover of the power engine is desired, utilizing a switchover algorithm to complete the switchover of the power engine comprises:

the power engine which is needed to be used by the hybrid electric vehicle at the current moment and the power engine which is used by the hybrid electric vehicle at the moment which is the last moment of the current moment are respectively recorded as a first engine and a second engine;

controlling the first engine and the second engine to enable the rotation speeds of the first engine and the second engine to be close to the target rotation speed;

and when the difference value between the rotating speeds of the first engine and the second engine is smaller than a preset threshold value, switching the power engine of the hybrid electric vehicle from the second engine to the first engine.

8. A hybrid vehicle power engine switching device, comprising:

the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is configured to acquire a running state and an operation instruction of the hybrid electric vehicle at the current moment, and the running state comprises speed, acceleration and steering wheel rotation angle;

the analysis module is configured to analyze the operation instruction to obtain the running fluctuation quantity of the hybrid electric vehicle in the running state, wherein the running fluctuation quantity comprises the fluctuation quantity of each of speed, acceleration and steering wheel rotation angle;

a judging module configured to judge whether the hybrid vehicle needs to switch a power engine based on the running state and the running fluctuation amount, wherein the power engine includes an engine and a motor;

and the switching module is configured to complete the switching of the power engine by using a switching algorithm when the power engine needs to be switched.

9. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the method of any one of claims 1 to 7 when executing the computer program.

10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method according to any one of claims 1 to 7.