CN113978448A - Method and device for controlling speed of hybrid electric vehicle - Google Patents

Method and device for controlling speed of hybrid electric vehicle Download PDF

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Publication number
CN113978448A
CN113978448A CN202111293218.7A CN202111293218A CN113978448A CN 113978448 A CN113978448 A CN 113978448A CN 202111293218 A CN202111293218 A CN 202111293218A CN 113978448 A CN113978448 A CN 113978448A
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speed
vehicle
vehicle speed
charge
target
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CN202111293218.7A
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CN113978448B (en
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张顺
权卫平
王冬
贾江涛
彭永金
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Dongfeng Motor Corp
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Dongfeng Motor Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
    • B60W20/15—Control strategies specially adapted for achieving a particular effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
    • B60W40/10—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to vehicle motion
    • B60W40/105—Speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/08—Electric propulsion units
    • B60W2510/081—Speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/24—Energy storage means
    • B60W2510/242—Energy storage means for electrical energy
    • B60W2510/244—Charge state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/30—Auxiliary equipments

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Hybrid Electric Vehicles (AREA)

Abstract

The invention relates to the technical field of electric vehicles, in particular to a method and a device for controlling the speed of a hybrid electric vehicle, wherein the method comprises the following steps: when the current speed of a vehicle reaches a set speed, acquiring the state of charge of a power battery of the vehicle; if the state of charge is not within the range of the charge threshold, obtaining the target speed of the vehicle according to the rated rotating speed of a generator and the rated rotating speed of a driving motor of the vehicle; and after the target vehicle speed is obtained, adjusting the current vehicle speed to the target vehicle speed, wherein the target vehicle speed is less than the current vehicle speed. The method realizes that the hybrid electric vehicle is in the maximum vehicle speed range, can meet the vehicle driving power requirement, can balance and control the charge state of the power battery, reasonably distributes the vehicle speed of the hybrid electric vehicle, improves the control efficiency of the hybrid electric vehicle, ensures the driving safety of the hybrid electric vehicle, and improves the user experience.

Description

Method and device for controlling speed of hybrid electric vehicle
Technical Field
The invention relates to the technical field of electric vehicles, in particular to a method and a device for controlling the speed of a hybrid electric vehicle.
Background
Nowadays, hybrid vehicles are one of the trends developed by various large automobile companies. The power system of a hybrid electric vehicle generally comprises a driving motor, a generator and an engine, and three power sources can be combined to output torque at the wheel end according to different vehicle working conditions so as to drive the vehicle.
When the hybrid electric vehicle runs at a high speed and the vehicle speed reaches the maximum value, the state of charge of a power battery of the hybrid electric vehicle may be in an abnormal state, so that the maximum torque and the minimum torque of a generator and a driving motor are zero, the generator cannot be charged and discharged normally, the power battery overshoots or is over-discharged, and the phenomena of over-high or over-low electric quantity of a high-voltage battery, vehicle anchorage and abnormal high voltage are generated. Therefore, the above phenomenon causes a problem that the control efficiency of the vehicle speed and the state of charge of the power battery is low when the hybrid vehicle is running at a high speed.
Disclosure of Invention
The embodiment of the application provides a control method and a control device for the speed of a hybrid electric vehicle, and solves the technical problem that the control efficiency of the speed and the charge state of a power battery is low when the hybrid electric vehicle runs at a high speed in the prior art, so that the hybrid electric vehicle is in the maximum speed range, the requirement on the driving power of the vehicle can be met, the charge state of the power battery can be balanced and controlled, the speed of the hybrid electric vehicle is reasonably distributed, the control efficiency of the hybrid electric vehicle is improved, the running safety of the hybrid electric vehicle is guaranteed, and the technical effects of user experience and the like are improved.
In a first aspect, an embodiment of the present invention provides a method for controlling a vehicle speed of a hybrid vehicle, including:
when the current speed of a vehicle reaches a set speed, acquiring the state of charge of a power battery of the vehicle;
if the state of charge is not within the range of the charge threshold, obtaining the target speed of the vehicle according to the rated rotating speed of a generator and the rated rotating speed of a driving motor of the vehicle;
and after the target vehicle speed is obtained, adjusting the current vehicle speed to the target vehicle speed, wherein the target vehicle speed is less than the current vehicle speed.
Preferably, the obtaining a target vehicle speed of the vehicle based on a rated rotation speed of a generator of the vehicle and a rated rotation speed of a drive motor includes:
obtaining a first predicted vehicle speed according to the rated rotating speed of the generator;
obtaining a second predicted vehicle speed according to the rated rotating speed of the driving motor;
and obtaining the target vehicle speed according to the first predicted vehicle speed and the second predicted vehicle speed.
Preferably, the obtaining the target vehicle speed according to the first predicted vehicle speed and the second predicted vehicle speed includes:
if the first predicted vehicle speed is not greater than the second predicted vehicle speed, determining the first predicted vehicle speed as the target vehicle speed;
otherwise, the second predicted vehicle speed is determined as the target vehicle speed.
Preferably, the obtaining a first predicted vehicle speed according to the rated rotation speed of the generator includes:
acquiring a main reduction ratio of the vehicle and a generator gear transmission ratio of the generator;
and obtaining the first predicted vehicle speed according to the rated rotating speed of the generator, the main reduction ratio of the vehicle and the gear transmission ratio of the generator.
Preferably, the obtaining a second predicted vehicle speed according to the rated rotation speed of the driving motor includes:
acquiring a main reduction ratio of the vehicle and a drive motor gear transmission ratio of the drive motor;
and obtaining the second predicted vehicle speed according to the rated rotating speed of the driving motor, the main reduction ratio of the vehicle and the gear transmission ratio of the driving motor.
Preferably, after the state of charge of the power battery of the vehicle is obtained, the method further comprises:
and if the state of charge is within the range of the charge threshold value, monitoring the state of charge in real time.
Preferably, after adjusting the current vehicle speed to the target vehicle speed, the method further includes:
and if the state of charge is within the range of the charge threshold value, adjusting the target vehicle speed to the set vehicle speed.
Based on the same inventive concept, in a second aspect, the present invention further provides a control device for vehicle speed of a hybrid vehicle, comprising:
the system comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring the state of charge of a power battery of a vehicle when the current speed of the vehicle reaches a set speed;
the second acquisition module is used for acquiring the target speed of the vehicle according to the rated rotating speed of a generator of the vehicle and the rated rotating speed of a driving motor if the charge state is not within the charge threshold range;
and the control module is used for adjusting the current vehicle speed to the target vehicle speed after the target vehicle speed is obtained, wherein the target vehicle speed is less than the current vehicle speed.
Based on the same inventive concept, in a third aspect, the invention provides a hybrid electric vehicle, comprising a memory, a processor and a computer program stored on the memory and operable on the processor, wherein the processor implements the steps of the method for controlling the vehicle speed of the hybrid electric vehicle when executing the program.
Based on the same inventive concept, in a fourth aspect, the present invention provides a readable storage medium having stored thereon a computer program, which when executed by a processor, performs the steps of the method for controlling the vehicle speed of a hybrid vehicle.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
in the embodiment of the invention, when the current vehicle speed of the vehicle reaches the set vehicle speed, the state of charge of the power battery of the vehicle is acquired. Here, when the vehicle travels at the maximum vehicle speed, it is necessary to determine the state of charge of the power battery and determine whether the state of charge is in an abnormal state. And if the state of charge is not in the range of the charge threshold value, indicating that the state of charge is in an abnormal state, obtaining the target speed of the vehicle according to the rated rotating speed of a generator of the vehicle and the rated rotating speed of a driving motor. The target speed is obtained on the basis of the working safety boundary of the generator and the driving motor, and the problems of high voltage of a battery automobile and vehicle anchor caused by overhigh or overlow electric quantity (soc) of a high-voltage battery are avoided. And under the condition that the hybrid electric vehicle is in the maximum vehicle speed range, the requirements of vehicle driving power can be met, the charge state of the power battery can be balanced and controlled, the control efficiency of the hybrid electric vehicle is improved, the driving safety of the hybrid electric vehicle is guaranteed, and the user experience is improved. After the target vehicle speed is obtained, the current vehicle speed of the vehicle is adjusted to the target vehicle speed, wherein the target vehicle speed is smaller than the current vehicle speed. The hybrid electric vehicle actively reduces the highest vehicle speed, can ensure the normal work of the generator, reasonably balances the charge state and improves the fuel economy of the vehicle to a certain extent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a flowchart illustrating steps of a method for controlling a vehicle speed of a hybrid vehicle according to an embodiment of the present invention;
fig. 2 is a schematic configuration diagram showing a power mode of the hybrid vehicle in the embodiment of the invention;
FIG. 3 is a block diagram showing a control apparatus for vehicle speed of a hybrid vehicle in the embodiment of the invention;
fig. 4 shows a schematic structural diagram of a hybrid vehicle in an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Example one
The first embodiment of the invention provides a method for controlling the speed of a hybrid electric vehicle, as shown in fig. 1. The control method solves the technical problem that the control efficiency of the speed and the state of charge of the power battery is low when the hybrid electric vehicle runs at a high speed. Here, when the hybrid vehicle is running at the maximum high speed, the power mode is that the engine and the driving motor of the hybrid vehicle cooperate to provide the driving force for the hybrid vehicle together.
When the hybrid vehicle runs at the maximum high speed, the power mode of the hybrid vehicle is as shown in fig. 2, and the clutch of the hybrid vehicle is engaged to connect the engine so that the engine and the driving motor provide driving force together. The generator generates electricity for the power battery, and meanwhile, the generator is mechanically connected with the engine. In fig. 2, i0 represents a final reduction ratio of the vehicle, i1 represents a generator gear ratio of the generator, i2 represents an engine gear ratio of the engine, and i3 represents a drive motor gear ratio of the drive motor.
The following describes in detail the specific implementation steps of the method for controlling the vehicle speed of the hybrid electric vehicle according to the embodiment with reference to fig. 1 and 2:
firstly, executing step S101, and acquiring the state of charge of a power battery of the vehicle when the current vehicle speed of the vehicle reaches a set vehicle speed;
specifically, the set vehicle speed is the maximum vehicle speed value under the current working condition of the vehicle or a vehicle speed value close to the maximum vehicle speed, and can be set according to actual requirements. When the current vehicle speed Of the vehicle reaches the set vehicle speed, the State Of Charge (SOC) Of the power battery Of the vehicle is acquired.
After the state of charge is obtained, executing step S102, and if the state of charge is not within the range of the charge threshold, obtaining a target speed of the vehicle according to the rated rotating speed of a generator and the rated rotating speed of a driving motor of the vehicle;
specifically, after the state of charge is obtained, the state of charge needs to be determined. If the charge state is within the charge threshold range, the charge state is a normal state, the maximum torque and the minimum torque of the generator and the driving motor are zero, the generator cannot be normally charged and discharged, the phenomenon of single-side charging or single-side discharging occurs, the high-voltage battery overshoots or overdischarging is caused, the safety problems that the electric quantity of the high-voltage battery is too high or too low and the like are caused, and the charge state is monitored in real time. The charge threshold range is usually 30% to 70%, and can be set according to actual requirements.
And if the state of charge is not within the charge threshold range, acquiring the target speed of the vehicle. The specific process for acquiring the target vehicle speed is as follows: obtaining a first predicted vehicle speed according to the rated rotating speed of a generator of the vehicle; obtaining a second predicted vehicle speed according to the rated rotating speed of a driving motor of the vehicle; and obtaining the target vehicle speed according to the first predicted vehicle speed and the second predicted vehicle speed.
The first predicted vehicle speed is obtained according to the rated rotating speed of the generator, and the specific obtaining steps are as follows: firstly, acquiring a main reduction ratio of a vehicle and a generator gear transmission ratio of a generator; and then obtaining a first predicted vehicle speed according to the rated rotating speed of the generator, the main reduction ratio of the vehicle and the gear transmission ratio of the generator. The rated rotating speed of the generator is the maximum rotating speed of the generator, and is usually 12500r/min, and can also be set according to actual requirements. The calculation formula of the first predicted vehicle speed is shown in formula (1).
C1＝(v1×1000×i0×i1×i2)/(60×Cy) (1)
Where C1 is a rated rotation speed of the generator (maximum rotation speed of the generator), v1 is a first predicted vehicle speed, i0 is a final reduction ratio of the vehicle shown in fig. 2, i1 is a generator gear transmission ratio shown in fig. 2, i2 is an engine gear transmission ratio shown in fig. 2, Cy is a circumferential length of the tire, and 1000 is a conversion relationship between kilometers and meters.
The second predicted vehicle speed is obtained according to the rated rotating speed of the driving motor, and the specific obtaining steps are as follows: firstly, acquiring a main reduction ratio of a vehicle and a gear transmission ratio of a driving motor of the driving motor; and obtaining a second predicted vehicle speed according to the rated rotating speed of the driving motor, the main reduction ratio of the vehicle and the gear transmission ratio of the driving motor. The rated rotating speed of the driving motor is the maximum rotating speed of the driving motor and can be set according to actual requirements. The calculation formula of the second predicted vehicle speed is shown in formula (2).
C2＝(v2×1000×i3)/(60×Cy) (2)
Where C2 is the rated rotation speed of the drive motor (the maximum rotation speed of the drive motor), v2 is the second predicted vehicle speed, and i3 is the drive motor gear ratio shown in fig. 2.
After the first predicted vehicle speed and the second predicted vehicle speed are obtained, the target vehicle speed that is the smaller of the first predicted vehicle speed and the second predicted vehicle speed is selected. The method specifically comprises the following steps: if the first predicted vehicle speed is not greater than the second predicted vehicle speed, determining the first predicted vehicle speed as a target vehicle speed; otherwise, the second predicted vehicle speed is determined as the target vehicle speed.
In the present embodiment, the vehicle speed of the vehicle is adjusted according to the maximum rotation speeds of the generator and the driving motor, taking whether the state of charge satisfies the charge threshold range as a determination condition. The target vehicle speed is set based on the working safety boundary of the generator and the driving motor, the problems of abnormal high voltage of the battery and vehicle anchor caused by overhigh or overlow electric quantity (namely SOC) of the high-voltage battery are avoided, the driving feeling is influenced, the driving safety is guaranteed, and the control efficiency of the vehicle is improved.
And finally, executing step S103, after obtaining the target vehicle speed, adjusting the current vehicle speed to the target vehicle speed, wherein the target vehicle speed is less than the current vehicle speed.
Specifically, after the target vehicle speed is obtained, the current vehicle speed of the vehicle is decelerated to the target vehicle speed. After the vehicle is driven at the target vehicle speed, if the state of charge is within the charge threshold range, which indicates that the state of charge is restored to a normal state, the target vehicle speed is adjusted to the set vehicle speed, that is, the vehicle can be increased from the target vehicle speed to the maximum vehicle speed.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
in the present embodiment, the state of charge of the power battery of the vehicle is acquired when the current vehicle speed of the vehicle reaches the set vehicle speed. Here, when the vehicle travels at the maximum vehicle speed, it is necessary to determine the state of charge of the power battery and determine whether the state of charge is in an abnormal state. And if the state of charge is not in the range of the charge threshold value, indicating that the state of charge is in an abnormal state, obtaining the target speed of the vehicle according to the rated rotating speed of a generator of the vehicle and the rated rotating speed of a driving motor. The target speed is obtained on the basis of the working safety boundary of the generator and the driving motor, and the problems of high voltage of a battery automobile and vehicle anchor caused by overhigh or overlow electric quantity (soc) of a high-voltage battery are avoided. And under the condition that the hybrid electric vehicle is in the maximum vehicle speed range, the requirements of vehicle driving power can be met, the charge state of the power battery can be balanced and controlled, the control efficiency of the hybrid electric vehicle is improved, the driving safety of the hybrid electric vehicle is guaranteed, and the user experience is improved. After the target vehicle speed is obtained, the current vehicle speed of the vehicle is adjusted to the target vehicle speed, wherein the target vehicle speed is smaller than the current vehicle speed. The hybrid electric vehicle actively reduces the highest vehicle speed, can ensure the normal work of the generator, reasonably balances the charge state and improves the fuel economy of the vehicle to a certain extent.
Example two
Based on the same inventive concept, a second embodiment of the present invention further provides a control apparatus for vehicle speed of a hybrid vehicle, as shown in fig. 3, comprising:
the first obtaining module 201 is configured to obtain a state of charge of a power battery of a vehicle when a current vehicle speed of the vehicle reaches a set vehicle speed;
the second obtaining module 202 is configured to obtain a target vehicle speed of the vehicle according to a rated rotation speed of a generator of the vehicle and a rated rotation speed of a driving motor if the state of charge is not within a charge threshold range;
and the control module 203 is configured to adjust the current vehicle speed to the target vehicle speed after the target vehicle speed is obtained, where the target vehicle speed is less than the current vehicle speed.
As an alternative embodiment, the second obtaining module 202 is configured to: the obtaining of the target vehicle speed of the vehicle according to the rated rotation speed of the generator of the vehicle and the rated rotation speed of the driving motor includes:
obtaining a first predicted vehicle speed according to the rated rotating speed of the generator; obtaining a second predicted vehicle speed according to the rated rotating speed of the driving motor; and obtaining the target vehicle speed according to the first predicted vehicle speed and the second predicted vehicle speed.
As an alternative embodiment, the second obtaining module 202 is configured to: the obtaining the target vehicle speed according to the first predicted vehicle speed and the second predicted vehicle speed includes: if the first predicted vehicle speed is not greater than the second predicted vehicle speed, determining the first predicted vehicle speed as the target vehicle speed; otherwise, the second predicted vehicle speed is determined as the target vehicle speed.
As an alternative embodiment, the second obtaining module 202 is configured to: obtaining a first predicted vehicle speed according to the rated rotating speed of the generator, wherein the first predicted vehicle speed comprises the following steps: acquiring a main reduction ratio of the vehicle and a generator gear transmission ratio of the generator; and obtaining the first predicted vehicle speed according to the rated rotating speed of the generator, the main reduction ratio of the vehicle and the gear transmission ratio of the generator.
As an alternative embodiment, the second obtaining module 202 is configured to: and obtaining a second predicted vehicle speed according to the rated rotating speed of the driving motor, wherein the second predicted vehicle speed comprises the following steps: acquiring a main reduction ratio of the vehicle and a drive motor gear transmission ratio of the drive motor; and obtaining the second predicted vehicle speed according to the rated rotating speed of the driving motor, the main reduction ratio of the vehicle and the gear transmission ratio of the driving motor.
As an alternative embodiment, the second obtaining module 202 is configured to: after the state of charge of the power battery of the vehicle is obtained, the method further comprises the following steps:
and if the state of charge is within the range of the charge threshold value, monitoring the state of charge in real time.
As an alternative embodiment, the control module 203 is configured to: after the current vehicle speed is adjusted to the target vehicle speed, if the state of charge is within a charge threshold range, the target vehicle speed is adjusted to the set vehicle speed.
Since the control device for the vehicle speed of the hybrid vehicle described in this embodiment is a device used for implementing the control method for the vehicle speed of the hybrid vehicle in the first embodiment of this application, based on the control method for the vehicle speed of the hybrid vehicle described in the first embodiment of this application, a person skilled in the art can understand the specific implementation manner of the control device for the vehicle speed of the hybrid vehicle in this embodiment and various modifications thereof, and therefore, how to implement the method in the first embodiment of this application by the control device for the vehicle speed of the hybrid vehicle is not described in detail here. The device used by those skilled in the art to implement the method for controlling the vehicle speed of the hybrid vehicle in the first embodiment of the present application is within the scope of the present application.
EXAMPLE III
Based on the same inventive concept, the third embodiment of the present invention further provides a hybrid electric vehicle, as shown in fig. 4, including a memory 304, a processor 302, and a computer program stored on the memory 304 and operable on the processor 302, wherein the processor 302 implements the steps of any one of the above-mentioned methods for controlling the vehicle speed of the hybrid electric vehicle when executing the program.
Where in fig. 4 a bus architecture (represented by bus 300), bus 300 may include any number of interconnected buses and bridges, bus 300 linking together various circuits including one or more processors, represented by processor 302, and memory, represented by memory 304. The bus 300 may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. A bus interface 306 provides an interface between the bus 300 and the receiver 301 and transmitter 303. The receiver 301 and the transmitter 303 may be the same element, i.e., a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 302 is responsible for managing the bus 300 and general processing, and the memory 304 may be used for storing data used by the processor 302 in performing operations.
Example four
Based on the same inventive concept, a fourth embodiment of the present invention also provides a computer-readable storage medium having a computer program stored thereon, the program, when executed by a processor, implementing the steps of any one of the methods of controlling vehicle speed of a hybrid vehicle described in the first embodiment.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A method for controlling the speed of a hybrid vehicle, comprising:
when the current speed of a vehicle reaches a set speed, acquiring the state of charge of a power battery of the vehicle;
if the state of charge is not within the range of the charge threshold, obtaining the target speed of the vehicle according to the rated rotating speed of a generator and the rated rotating speed of a driving motor of the vehicle;
and after the target vehicle speed is obtained, adjusting the current vehicle speed to the target vehicle speed, wherein the target vehicle speed is less than the current vehicle speed.
2. The method of claim 1, wherein obtaining the target vehicle speed of the vehicle based on the rated rotational speed of the generator and the rated rotational speed of the drive motor of the vehicle comprises:
obtaining a first predicted vehicle speed according to the rated rotating speed of the generator;
obtaining a second predicted vehicle speed according to the rated rotating speed of the driving motor;
and obtaining the target vehicle speed according to the first predicted vehicle speed and the second predicted vehicle speed.
3. The method of claim 2, wherein said deriving the target vehicle speed from the first predicted vehicle speed and the second predicted vehicle speed comprises:
if the first predicted vehicle speed is not greater than the second predicted vehicle speed, determining the first predicted vehicle speed as the target vehicle speed;
otherwise, the second predicted vehicle speed is determined as the target vehicle speed.
4. The method of claim 2, wherein deriving a first predicted vehicle speed based on a rated speed of the generator comprises:
acquiring a main reduction ratio of the vehicle and a generator gear transmission ratio of the generator;
and obtaining the first predicted vehicle speed according to the rated rotating speed of the generator, the main reduction ratio of the vehicle and the gear transmission ratio of the generator.
5. The method of claim 2, wherein deriving a second predicted vehicle speed based on a rated speed of the drive motor comprises:
acquiring a main reduction ratio of the vehicle and a drive motor gear transmission ratio of the drive motor;
and obtaining the second predicted vehicle speed according to the rated rotating speed of the driving motor, the main reduction ratio of the vehicle and the gear transmission ratio of the driving motor.
6. The method of claim 1, after obtaining the state of charge of the power cell of the vehicle, further comprising:
and if the state of charge is within the range of the charge threshold value, monitoring the state of charge in real time.
7. The method of claim 1, after adjusting the current vehicle speed to the target vehicle speed, further comprising:
and if the state of charge is within the range of the charge threshold value, adjusting the target vehicle speed to the set vehicle speed.
8. A control device for vehicle speed of a hybrid vehicle, comprising:
the system comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring the state of charge of a power battery of a vehicle when the current speed of the vehicle reaches a set speed;
the second acquisition module is used for acquiring the target speed of the vehicle according to the rated rotating speed of a generator of the vehicle and the rated rotating speed of a driving motor if the charge state is not within the charge threshold range;
and the control module is used for adjusting the current vehicle speed to the target vehicle speed after the target vehicle speed is obtained, wherein the target vehicle speed is less than the current vehicle speed.
9. A hybrid vehicle comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method steps of any of claims 1-7 when executing the program.
10. A readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method steps of any one of claims 1 to 7.
CN202111293218.7A 2021-11-03 2021-11-03 Control method and device for speed of hybrid electric vehicle Active CN113978448B (en)

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