CN113071329A - Vehicle and motor rotating speed control method and device thereof and storage medium - Google Patents
Vehicle and motor rotating speed control method and device thereof and storage medium Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
- B60L2240/421—Speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
- B60L2240/423—Torque
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2260/00—Operating Modes
- B60L2260/40—Control modes
- B60L2260/44—Control modes by parameter estimation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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Abstract
The invention discloses a vehicle and a motor rotating speed control method, a motor rotating speed control device and a storage medium thereof, wherein the motor rotating speed control method comprises the following steps: when the vehicle accelerates, acquiring a rotating speed gradient value of a motor and a target torque corresponding to an accelerator pedal of the vehicle; carrying out torque limitation on the target torque according to the rotating speed gradient value; the motor is controlled according to the limited target torque to prevent the motor from overspeeding. Therefore, in the vehicle acceleration process, the target torque corresponding to the accelerator pedal of the vehicle is limited according to the rotating speed gradient value of the motor, so that a torque control strategy is optimized, the motor overspeed caused by overlarge target torque is effectively prevented, the service life of the gearbox is prolonged, and the stability of the vehicle is ensured.
Description
Technical Field
The present invention relates to the field of vehicle technologies, and in particular, to a method for controlling a motor speed of a vehicle, a computer-readable storage medium, a device for controlling a motor speed of a vehicle, and a vehicle.
Background
At present, a large-torque low-rotation-speed motor is generally adopted by a new energy heavy vehicle, so that when a full accelerator or a medium-large accelerator is used for starting, the rotation speed is easy to exceed the bearable limit value of an input shaft of a gearbox, and the main reasons are as follows: when a large accelerator is used, the acceleration torque is too large, the rotating speed often climbs too fast, the torque is reduced in the gear shifting process in the default state, the rotating speed of the motor is increased in the torque reducing process due to the fact that the torque is too large in the acceleration process, the motor torque reducing gradient is limited, the rotating speed of the motor exceeds the bearable limit value of the input shaft of the gearbox, the service life of the gearbox is lost, and the stability of the whole vehicle is reduced.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first object of the present invention is to provide a method for controlling a motor speed of a vehicle, which can optimize a torque control strategy, effectively prevent over-speed of the motor caused by an excessive acceleration, prolong a transmission life, and ensure vehicle stability.
A second object of the invention is to propose a computer-readable storage medium.
A third object of the present invention is to provide a motor rotation speed control apparatus for a vehicle.
A fourth object of the invention is to propose a vehicle.
In order to achieve the above object, a method for controlling a rotation speed of a motor of a vehicle according to an embodiment of a first aspect of the present invention includes: when a vehicle is accelerated, acquiring a rotating speed gradient value of the motor and a target torque corresponding to an accelerator pedal of the vehicle; carrying out torque limitation on the target torque according to the rotating speed gradient value; controlling the motor according to the limited target torque to prevent the motor from overspeeding.
According to the motor rotating speed control method of the vehicle, when the vehicle accelerates, the rotating speed gradient value of the motor and the target torque corresponding to the accelerator pedal of the vehicle are obtained, the target torque is limited according to the rotating speed gradient value, and the motor is controlled according to the limited target torque to prevent the motor from overspeeding. Therefore, in the vehicle acceleration process, the target torque corresponding to the accelerator pedal of the vehicle is limited according to the rotating speed gradient value of the motor, so that a torque control strategy is optimized, the motor overspeed caused by overlarge acceleration is effectively prevented, the service life of the gearbox is prolonged, and the vehicle stability is ensured.
In addition, the method for controlling the rotation speed of the motor of the vehicle according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the obtaining the rotation speed gradient value of the motor includes: acquiring the current rotating speed of the motor and the rotating speed of the previous period; and acquiring a rotating speed difference value between the current rotating speed and the rotating speed of the previous period to obtain the rotating speed gradient value.
According to an embodiment of the present invention, the torque limiting the target torque according to the rotation speed gradient value includes: acquiring a torque limiting coefficient according to the rotating speed gradient value, wherein the torque limiting coefficient is smaller than 1; multiplying the torque limiting coefficient with the target torque to limit the target torque.
According to an embodiment of the present invention, the motor rotation speed control method of a vehicle further includes: acquiring a rotating speed gradient limiting value of the motor and a current torque gradient value of the motor; carrying out torque gradient limitation on the current torque gradient value according to the rotating speed gradient limiting value; controlling the motor according to the limited torque gradient value and the limited target torque to prevent the motor from overspeeding.
According to an embodiment of the present invention, the obtaining of the rotation speed gradient limit value of the motor includes: acquiring the current rotating speed of the motor and a rotating speed limit value corresponding to a gearbox of the vehicle; and acquiring a rotating speed difference value between the current rotating speed and the rotating speed limit value to obtain the rotating speed gradient limit value.
According to an embodiment of the present invention, the torque gradient limiting the current torque gradient value according to the rotation speed gradient limiting value includes: acquiring a torque gradient limiting coefficient according to the rotating speed gradient limiting value, wherein the torque gradient limiting coefficient is smaller than 1; multiplying the torque gradient limiting coefficient by the current torque gradient value to torque gradient limit the current torque gradient value.
According to an embodiment of the present invention, the controlling the motor according to the limited torque gradient value and the limited target torque to prevent the motor from overspeeding includes: and gradually increasing the target torque of the motor according to the limited torque gradient value by taking the limited target torque as a reference, and controlling the motor according to the increased target torque of the motor.
To achieve the above object, a computer-readable storage medium according to an embodiment of a second aspect of the present invention stores thereon a motor rotation speed control program, which when executed by a processor, implements a motor rotation speed control method of a vehicle as described above.
According to the computer-readable storage medium of the embodiment of the invention, the processor executes the motor rotating speed control program stored on the processor, so that the target torque corresponding to the accelerator pedal of the vehicle can be limited according to the rotating speed gradient value of the motor in the vehicle acceleration process, thereby optimizing a torque control strategy, effectively preventing the motor from overspeed caused by overlarge acceleration, prolonging the service life of a gearbox and ensuring the stability of the vehicle.
In order to achieve the above object, a motor rotation speed control device for a vehicle according to a third aspect of the present invention includes: the acquisition module is used for acquiring a rotating speed gradient value of the motor and a target torque corresponding to an accelerator pedal of the vehicle when the vehicle accelerates; the torque limiting module is used for carrying out torque limitation on the target torque according to the rotating speed gradient value; and the motor control module is used for controlling the motor according to the limited target torque so as to prevent the motor from overspeed.
According to the motor rotating speed control device of the vehicle, when the vehicle accelerates, the obtaining module obtains the rotating speed gradient value of the motor and the target torque corresponding to the accelerator pedal of the vehicle, the torque limiting module limits the torque of the target torque according to the rotating speed gradient value, and the motor control module controls the motor according to the limited target torque to prevent the motor from overspeeding. Therefore, in the vehicle acceleration process, the target torque corresponding to the accelerator pedal of the vehicle is limited according to the rotating speed gradient value of the motor, so that a torque control strategy is optimized, the motor overspeed caused by overlarge acceleration is effectively prevented, the service life of the gearbox is prolonged, and the vehicle stability is ensured.
In order to achieve the above object, a vehicle according to a fourth aspect of the present invention includes the motor rotation speed control apparatus for a vehicle as described above.
According to the vehicle provided by the embodiment of the invention, the motor rotating speed control device of the vehicle is adopted, so that the target torque corresponding to the accelerator pedal of the vehicle can be limited according to the rotating speed gradient value of the motor in the vehicle acceleration process, the torque control strategy is optimized, the motor overspeed caused by overlarge acceleration is effectively prevented, the service life of a gearbox is prolonged, and the stability of the vehicle is ensured.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a flowchart illustrating a motor rotation speed control method of a vehicle according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a method for controlling a rotational speed of a motor according to an embodiment of the present invention;
FIG. 3 is a flow chart illustrating a method for controlling a rotational speed of a motor of a vehicle according to an embodiment of the present invention;
FIG. 4 is a flow chart illustrating a method for controlling a rotational speed of a motor according to an embodiment of the present invention;
FIG. 5 is a block diagram illustrating an exemplary motor speed control apparatus for a vehicle according to an embodiment of the present invention;
fig. 6 is a block diagram schematically illustrating a motor rotation speed control apparatus of a vehicle according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A motor rotation speed control method of a vehicle, a computer-readable storage medium, a motor rotation speed control apparatus of a vehicle, and a vehicle according to embodiments of the invention are described below with reference to the drawings.
Fig. 1 is a flowchart illustrating a motor rotation speed control method of a vehicle according to an embodiment of the present invention.
As shown in fig. 1, the motor rotation speed control method of a vehicle includes the steps of:
and S101, acquiring a rotating speed gradient value of the motor and a target torque corresponding to an accelerator pedal of the vehicle when the vehicle accelerates.
Specifically, when the vehicle is accelerated, the corresponding target torque can be obtained through the accelerator pedal opening degree of the vehicle, wherein the accelerator pedal opening degrees of different vehicles correspond to different target torques, for example, the larger the accelerator pedal opening degree, the larger the target torque.
And S102, carrying out torque limitation on the target torque according to the rotating speed gradient value.
That is to say, can carry out the torque restriction to the target moment of torsion according to the rotational speed gradient value to effectively prevent the target moment of torsion too big and lead to the motor overspeed, improve the gearbox life-span, ensure vehicle stability.
And S103, controlling the motor according to the limited target torque to prevent the motor from overspeeding.
Specifically, the motor is controlled by the limited target torque, so that the rotating speed of the motor can be slowly increased in the vehicle gear shifting process, particularly in the acceleration gear shifting process of the vehicle from a low gear, the motor is prevented from overspeeding, the service life of the transmission is prolonged, and the stability of the vehicle is ensured.
Further, acquiring a rotation speed gradient value of the motor, as shown in fig. 2, includes: the method comprises the steps of obtaining the current rotating speed of a motor and the rotating speed of the previous period, and obtaining the rotating speed difference value between the current rotating speed and the rotating speed of the previous period to obtain the rotating speed gradient value.
Specifically, the current rotating speed of the motor and the rotating speed of the last period can be obtained through a vehicle controller of the vehicle.
Further, the torque limiting of the target torque according to the rotation speed gradient value, as shown in fig. 2, includes: and acquiring a torque limiting coefficient according to the rotating speed gradient value, wherein the torque limiting coefficient is less than 1, and multiplying the torque limiting coefficient and the target torque to limit the target torque.
Specifically, after the rotation speed gradient value is obtained according to the rotation speed difference value between the current rotation speed of the motor and the rotation speed of the previous period, the torque limiting coefficient corresponding to the rotation speed gradient value can be obtained in a table look-up manner, wherein different rotation speed gradient values correspond to different torque limiting coefficients, and then the torque limiting coefficient is multiplied by the target torque to limit the target torque, so as to obtain the limited target torque.
It can be understood that the corresponding relationship between the speed gradient value and the torque limit coefficient can be obtained through a preliminary experiment and stored in the vehicle control unit, so as to obtain the torque limit coefficient according to the speed gradient value.
Further, as shown in fig. 3, the method for controlling the rotational speed of the motor of the vehicle further includes:
s201, acquiring a rotation speed gradient limiting value of the motor and a current torque gradient value of the motor.
Specifically, the current torque gradient value of the motor may be acquired through a vehicle controller of the vehicle.
And S202, carrying out torque gradient limitation on the current torque gradient value according to the rotating speed gradient limiting value.
That is to say, can carry out the moment of torsion gradient restriction according to rotational speed gradient restriction value to current moment of torsion gradient value to through reducing current moment of torsion gradient value, reduce the moment of torsion change and fluctuate, thereby, promote shift quality and drive impression.
And S203, controlling the motor according to the limited torque gradient value and the limited target torque to prevent the motor from overspeeding.
Specifically, the motor is controlled by the limited torque gradient value and the limited target torque, so that the rotating speed of the motor can be slowly increased in the vehicle gear shifting process, particularly the vehicle accelerating gear shifting process from a low gear, and meanwhile, the torque change fluctuation of each gear shifting point is reduced, so that the motor is prevented from overspeed, the service life of a transmission is prolonged, the stability of the vehicle is ensured, and meanwhile, the gear shifting quality and the driving feeling are improved.
Further, acquiring a rotation speed gradient limit value of the motor, as shown in fig. 4, includes: the method comprises the steps of obtaining the current rotating speed of a motor and a rotating speed limit value corresponding to a gearbox of a vehicle, and obtaining a rotating speed difference value between the current rotating speed and the rotating speed limit value to obtain a rotating speed gradient limit value.
Specifically, the current rotating speed of the motor and the rotating speed limit value corresponding to the gearbox of the vehicle can be obtained through the vehicle control unit of the vehicle.
It should be noted that the rotation speed limit corresponding to the transmission of the vehicle may be calibrated according to the type of the transmission or the type of the vehicle.
Further, performing torque gradient limitation on the current torque gradient value according to the rotation speed gradient limitation value, as shown in fig. 4, includes: and acquiring a torque gradient limiting coefficient according to the rotating speed gradient limiting value, wherein the torque gradient limiting coefficient is smaller than 1, and multiplying the torque gradient limiting coefficient and the current torque gradient value to carry out torque gradient limitation on the current torque gradient value.
Specifically, after the rotation speed gradient limiting value is obtained according to the rotation speed difference between the current rotation speed of the motor and the rotation speed limiting value of the gearbox, the torque gradient limiting coefficient corresponding to the rotation speed gradient limiting value can be obtained in a table look-up mode, wherein different rotation speed gradient limiting values correspond to different torque gradient limiting coefficients, and then the torque gradient limiting coefficient and the current torque gradient value are multiplied to carry out torque gradient limitation on the current torque gradient value so as to obtain the limited torque gradient value.
Further, controlling the motor to prevent the motor from overspeeding according to the limited torque gradient value and the limited target torque, includes: and gradually increasing the target torque of the motor according to the limited torque gradient value by taking the limited target torque as a reference, and controlling the motor according to the increased target torque of the motor.
For example, assuming that the limited target torque is 800N and the limited torque gradient value is 8N/s, the limited torque control strategy is to gradually increase the current torque of the vehicle to 800N at the torque gradient value of 8N/s, and reduce the torque variation fluctuation of each shift point while preventing the motor from overspeeding.
In summary, according to the motor rotation speed control method of the vehicle in the embodiment of the invention, when the vehicle accelerates, the rotation speed gradient value of the motor and the target torque corresponding to the accelerator pedal of the vehicle are acquired, the target torque is limited according to the rotation speed gradient value, and the motor is controlled according to the limited target torque to prevent the motor from overspeeding. Therefore, in the vehicle acceleration process, the target torque corresponding to the accelerator pedal of the vehicle is limited according to the rotating speed gradient value of the motor, so that a torque control strategy is optimized, the motor overspeed caused by overlarge acceleration is effectively prevented, the service life of the gearbox is prolonged, and the vehicle stability is ensured.
Further, an embodiment of the present invention further provides a computer-readable storage medium, on which a motor rotation speed control program is stored, and when the motor rotation speed control program is executed by a processor, the method for controlling the rotation speed of the motor of the vehicle according to the foregoing embodiment of the present invention is implemented.
It should be noted that, when the motor rotation speed control program stored in the computer-readable storage medium according to the embodiment of the present invention is executed by the processor, a specific implementation manner corresponding to the motor rotation speed control method of the vehicle according to the foregoing embodiment of the present invention can be implemented, and details are not described herein again.
In summary, according to the computer-readable storage medium of the embodiment of the invention, the processor executes the motor rotation speed control program stored thereon, and the target torque corresponding to the accelerator pedal of the vehicle can be limited according to the rotation speed gradient value of the motor in the vehicle acceleration process, so that the torque control strategy is optimized, the motor overspeed caused by the excessive acceleration is effectively prevented, the service life of the transmission is prolonged, and the stability of the vehicle is ensured.
Fig. 5 is a block diagram schematically illustrating a motor rotation speed control apparatus of a vehicle according to an embodiment of the present invention.
As shown in fig. 5, a motor rotation speed control apparatus 100 for a vehicle includes: an acquisition module 10, a torque limiting module 20 and a motor control module 30.
The obtaining module 10 is configured to obtain a rotation speed gradient value of a motor and a target torque corresponding to an accelerator pedal of a vehicle when the vehicle accelerates; the torque limiting module 20 is used for performing torque limitation on the target torque according to the rotating speed gradient value; the motor control module 30 is configured to control the motor based on the limited target torque to prevent the motor from overspeeding.
Further, the obtaining module 10 is further configured to obtain a current rotation speed of the motor and a rotation speed of a previous period, and obtain a rotation speed difference between the current rotation speed and the rotation speed of the previous period to obtain a rotation speed gradient value.
Further, the torque limiting module 20 is further configured to obtain a torque limiting coefficient according to the rotation speed gradient value, wherein the torque limiting coefficient is smaller than 1, and limit the target torque by multiplying the torque limiting coefficient and the target torque.
Further, the motor rotation speed control apparatus 100 of the vehicle further includes: a torque gradient limiting module 40.
The obtaining module 10 is further configured to obtain a rotation speed gradient limit value of the motor and a current torque gradient value of the motor; the torque gradient limiting module 40 is configured to perform torque gradient limitation on the current torque gradient value according to the rotation speed gradient limiting value; the motor control module 30 is further configured to control the motor to prevent the motor from overspeeding based on the limited torque gradient value and the limited target torque.
Further, the obtaining module 10 is further configured to obtain a current rotation speed of the motor and a rotation speed limit corresponding to a transmission of the vehicle, and obtain a rotation speed difference between the current rotation speed and the rotation speed limit to obtain a rotation speed gradient limit.
Further, the torque gradient limiting module 40 is further configured to obtain a torque gradient limiting coefficient according to the rotational speed gradient limiting value, where the torque gradient limiting coefficient is smaller than 1, and multiply the torque gradient limiting coefficient by the current torque gradient value to perform torque gradient limitation on the current torque gradient value.
Further, the motor control module 30 is further configured to gradually increase the target torque of the motor according to the limited torque gradient value with reference to the limited target torque, and control the motor according to the increased target torque of the motor.
It should be noted that the specific implementation of the vehicle motor rotation speed control device 100 according to the embodiment of the present invention corresponds to the specific implementation of the vehicle motor rotation speed control method according to the foregoing embodiment of the present invention, and details are not repeated herein.
In summary, according to the motor rotation speed control apparatus of the vehicle in the embodiment of the invention, when the vehicle accelerates, the obtaining module obtains the rotation speed gradient value of the motor and the target torque corresponding to the accelerator pedal of the vehicle, the torque limiting module limits the torque of the target torque according to the rotation speed gradient value, and the motor control module controls the motor according to the limited target torque to prevent the motor from overspeeding. Therefore, in the vehicle acceleration process, the target torque corresponding to the accelerator pedal of the vehicle is limited according to the rotating speed gradient value of the motor, so that a torque control strategy is optimized, the motor overspeed caused by overlarge acceleration is effectively prevented, the service life of the gearbox is prolonged, and the vehicle stability is ensured.
Fig. 6 is a block diagram schematically illustrating a motor rotation speed control apparatus of a vehicle according to an embodiment of the present invention.
As shown in fig. 6, the vehicle 1000 includes the motor rotation speed control apparatus 100 of the vehicle according to the foregoing embodiment of the invention.
It should be noted that, for a specific implementation of the vehicle 1000 according to the embodiment of the present invention, reference may be made to the specific implementation of the motor rotation speed control device 100 of the vehicle according to the foregoing embodiment of the present invention, and details are not described herein again.
In summary, according to the vehicle according to the embodiment of the invention, by using the motor speed control device of the vehicle, the target torque corresponding to the accelerator pedal of the vehicle can be limited according to the speed gradient value of the motor in the vehicle acceleration process, so that a torque control strategy is optimized, the motor overspeed caused by the overlarge acceleration is effectively prevented, the service life of the transmission is prolonged, and the stability of the vehicle is ensured.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A motor rotation speed control method of a vehicle, characterized by comprising the steps of:
when a vehicle is accelerated, acquiring a rotating speed gradient value of the motor and a target torque corresponding to an accelerator pedal of the vehicle;
carrying out torque limitation on the target torque according to the rotating speed gradient value;
controlling the motor according to the limited target torque to prevent the motor from overspeeding.
2. The motor rotation speed control method of a vehicle according to claim 1, wherein the obtaining a rotation speed gradient value of the motor includes:
acquiring the current rotating speed of the motor and the rotating speed of the previous period;
and acquiring a rotating speed difference value between the current rotating speed and the rotating speed of the previous period to obtain the rotating speed gradient value.
3. The motor rotation speed control method of a vehicle according to claim 1, wherein the torque-limiting the target torque according to the rotation speed gradient value includes:
acquiring a torque limiting coefficient according to the rotating speed gradient value, wherein the torque limiting coefficient is smaller than 1;
multiplying the torque limiting coefficient with the target torque to limit the target torque.
4. The motor rotation speed control method of the vehicle according to any one of claims 1 to 3, characterized by further comprising:
acquiring a rotating speed gradient limiting value of the motor and a current torque gradient value of the motor;
carrying out torque gradient limitation on the current torque gradient value according to the rotating speed gradient limiting value;
controlling the motor according to the limited torque gradient value and the limited target torque to prevent the motor from overspeeding.
5. The motor speed control method of the vehicle according to claim 4, wherein the acquiring the rotation speed gradient limit value of the motor includes:
acquiring the current rotating speed of the motor and a rotating speed limit value corresponding to a gearbox of the vehicle;
and acquiring a rotating speed difference value between the current rotating speed and the rotating speed limit value to obtain the rotating speed gradient limit value.
6. The motor speed control method of a vehicle according to claim 4, wherein said torque gradient limiting the current torque gradient value in accordance with the rotation speed gradient limiting value includes:
acquiring a torque gradient limiting coefficient according to the rotating speed gradient limiting value, wherein the torque gradient limiting coefficient is smaller than 1;
multiplying the torque gradient limiting coefficient by the current torque gradient value to torque gradient limit the current torque gradient value.
7. The motor speed control method of a vehicle according to claim 4, wherein the controlling the motor to prevent the motor from overspeeding in accordance with the limited torque gradient value and the limited target torque includes:
and gradually increasing the target torque of the motor according to the limited torque gradient value by taking the limited target torque as a reference, and controlling the motor according to the increased target torque of the motor.
8. A computer-readable storage medium having a motor rotation speed control program stored thereon, characterized in that the motor rotation speed control program, when executed by a processor, implements a motor rotation speed control method of a vehicle according to any one of claims 1 to 7.
9. A motor rotation speed control apparatus of a vehicle, characterized by comprising:
the acquisition module is used for acquiring a rotating speed gradient value of the motor and a target torque corresponding to an accelerator pedal of the vehicle when the vehicle accelerates;
the torque limiting module is used for carrying out torque limitation on the target torque according to the rotating speed gradient value;
and the motor control module is used for controlling the motor according to the limited target torque so as to prevent the motor from overspeed.
10. A vehicle characterized by comprising the motor rotation speed control apparatus of the vehicle according to claim 9.
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Application publication date: 20210706 |