CN109849690B - Motor control method and control device for electric automobile - Google Patents
Motor control method and control device for electric automobile Download PDFInfo
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- CN109849690B CN109849690B CN201910186685.6A CN201910186685A CN109849690B CN 109849690 B CN109849690 B CN 109849690B CN 201910186685 A CN201910186685 A CN 201910186685A CN 109849690 B CN109849690 B CN 109849690B
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Abstract
The invention discloses a motor control method of an electric automobile, relates to the technical field of automobiles, and mainly aims to solve the problem that a driver cannot cope with the situation in real time when the automobile slips; the method comprises the following steps: acquiring the actual speed of the vehicle; calculating the approved vehicle speed of the vehicle according to the transmission ratio and the actual rotating speed of the motor; and comparing the actual vehicle speed with the approved vehicle speed, judging whether the vehicle slips or not according to the difference value between the actual vehicle speed and the approved vehicle speed, if so, cutting off the transmission connection between the motor and the accelerator pedal, and simultaneously reducing the actual rotating speed of the motor. The invention can immediately respond when the vehicle slips, and avoid unexpected accidents caused by slow response.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a motor control method and a motor control device of an electric automobile.
Background
With the popularization of new energy technology, more electric automobiles of different types appear on the market. The electric automobile is a vehicle which takes a vehicle-mounted power supply as power and drives wheels to run by using a motor, and meets various requirements of road traffic and safety regulations. Because the influence on the environment is smaller than that of the traditional automobile, the automobile has the advantages of high efficiency, energy conservation and the like, and the prospect is widely seen.
The electric motor car easily produces the tire phenomenon of skidding when running in-process and running into wet and slippery road surface or the road surface that freezes, and this is mainly because the tire loses and grabs the land fertility and causes, and the tire skids and can cause the motor idle running, extravagant energy also has certain potential safety hazard simultaneously. The simplest way to solve the tire slip is to reduce the vehicle speed so that the tire regains grip, which requires the driver to release the throttle and reduce the vehicle speed. However, because human senses have certain errors, the instant response to the tire slip phenomenon is difficult, and unexpected accidents may occur due to slow response.
Disclosure of Invention
The invention aims to provide a motor control method and a motor control device of an electric automobile, so as to solve the problems.
In order to achieve the purpose, the invention provides the following technical scheme:
a motor control method of an electric automobile comprises the following steps:
acquiring the actual speed of the vehicle;
calculating the approved vehicle speed of the vehicle according to the transmission ratio and the actual rotating speed of the motor;
and comparing the actual vehicle speed with the approved vehicle speed, judging whether the vehicle slips or not according to the difference value between the actual vehicle speed and the approved vehicle speed, if so, cutting off the transmission connection between the motor and the accelerator pedal, and simultaneously reducing the actual rotating speed of the motor.
In one alternative: the acquiring the actual vehicle speed of the vehicle comprises:
acquiring the driving distance of a vehicle in a period of time;
and calculating the actual vehicle speed according to the running distance and the numerical value of the time.
In one alternative: the judging whether the vehicle slips or not according to the difference value between the actual vehicle speed and the approved vehicle speed comprises the following steps:
comparing the actual vehicle speed with a first vehicle speed preset value and a second vehicle speed preset value, wherein the first vehicle speed preset value is larger than the second vehicle speed preset value;
when the actual vehicle speed is greater than a second vehicle speed preset value and smaller than a first vehicle speed preset value, comparing a difference value between the actual vehicle speed and the approved vehicle speed with a first preset difference value, and when the difference value is greater than the first preset difference value, judging that the vehicle slips;
when the actual vehicle speed is greater than a first vehicle speed preset value, comparing the difference value between the actual vehicle speed and the approved vehicle speed with a second preset difference value, and when the difference value is greater than the second preset difference value, judging that the vehicle slips;
the first preset difference is smaller than the second preset difference.
In one alternative: the method further comprises the following steps:
when judging that the vehicle skids, send alarm information so that the driver knows.
A motor control apparatus of an electric vehicle, comprising:
an acquisition unit configured to acquire an actual vehicle speed of a vehicle;
the checking unit is used for calculating the checking vehicle speed of the vehicle according to the transmission ratio and the actual rotating speed of the motor;
and the analysis execution unit is used for comparing the actual vehicle speed with the approved vehicle speed, judging whether the vehicle slips or not according to the difference value between the actual vehicle speed and the approved vehicle speed, and if so, cutting off the transmission connection between the motor and the accelerator pedal and simultaneously reducing the actual rotating speed of the motor.
In one alternative: the acquisition unit includes:
the acquisition subunit I is used for acquiring the driving distance of the vehicle in a period of time;
and the acquisition subunit II is used for calculating the actual vehicle speed according to the running distance and the numerical value of the time.
In one alternative: the analysis execution unit includes:
the analysis subunit is used for comparing the actual vehicle speed with a first vehicle speed preset value and a second vehicle speed preset value, wherein the first vehicle speed preset value is larger than the second vehicle speed preset value;
the judgment subunit I is used for comparing a difference value between the actual vehicle speed and the approved vehicle speed with a first preset difference value when the actual vehicle speed is greater than a second preset vehicle speed value and less than a first preset vehicle speed value, and judging that the vehicle slips when the difference value is greater than the first preset difference value;
and the judgment subunit II is used for comparing the difference between the actual vehicle speed and the approved vehicle speed with a second preset difference when the actual vehicle speed is greater than the first vehicle speed preset value, and judging that the vehicle slips when the difference is greater than the second preset difference.
In one alternative: the device further comprises:
and the alarm unit is used for sending alarm information when the vehicle is judged to skid.
A computer storage medium, characterized in that the medium stores at least one instruction, and the at least one instruction is loaded and executed by a processor to implement the motor control method of the electric vehicle.
Compared with the prior art, the invention has the following beneficial effects:
the method comprises the steps of obtaining the actual speed of a vehicle; calculating the approved vehicle speed of the vehicle according to the transmission ratio and the actual rotating speed of the motor; and comparing the actual vehicle speed with the approved vehicle speed, judging whether the vehicle slips or not according to the difference value between the actual vehicle speed and the approved vehicle speed, if so, cutting off the transmission connection between the motor and the accelerator pedal, and simultaneously reducing the actual rotating speed of the motor. The method and the device can immediately respond when the vehicle slips, and unexpected accidents caused by slow response are avoided.
Drawings
Fig. 1 is a flowchart of a motor control method of an electric vehicle according to the present invention.
Fig. 2 is a flowchart of another embodiment of a motor control method for an electric vehicle according to the present invention.
Fig. 3 is a schematic structural diagram of a motor control device of an electric vehicle according to the present invention.
Fig. 4 is a schematic structural diagram of another embodiment of the motor control device of the electric vehicle according to the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments, wherein like or similar elements are designated by like reference numerals throughout the several views, and wherein the shape, thickness or height of the various elements may be expanded or reduced in practice. The examples are given solely for the purpose of illustration and are not intended to limit the scope of the invention. Any obvious modifications or variations can be made to the present invention without departing from the spirit or scope of the present invention.
Example 1
Referring to fig. 1, in an embodiment of the present invention, a method for controlling a motor of an electric vehicle includes the following steps:
and S10, acquiring the actual speed of the vehicle.
Further, the step S10 includes:
s101, acquiring the driving distance of a vehicle in a period of time;
and S102, calculating the actual vehicle speed according to the running distance and the numerical value of the time.
The travel distance in step S101 is generally acquired by GPS, but may be acquired by other devices.
And S20, calculating the approved vehicle speed of the vehicle according to the transmission ratio and the actual rotating speed of the motor.
And S30, comparing the actual vehicle speed with the approved vehicle speed, judging whether the vehicle slips or not according to the difference value between the actual vehicle speed and the approved vehicle speed, if so, cutting off the transmission connection between the motor and the accelerator pedal, and simultaneously reducing the actual rotating speed of the motor.
Further, the step S30 includes:
s301, comparing the actual vehicle speed with a first vehicle speed preset value and a second vehicle speed preset value, wherein the first vehicle speed preset value is larger than the second vehicle speed preset value;
s302, when the actual vehicle speed is greater than a second vehicle speed preset value and smaller than a first vehicle speed preset value, comparing a difference value between the actual vehicle speed and the approved vehicle speed with a first preset difference value, and when the difference value is greater than the first preset difference value, judging that the vehicle slips;
s303, when the actual vehicle speed is greater than a first vehicle speed preset value, comparing the difference value between the actual vehicle speed and the approved vehicle speed with a second preset difference value, and when the difference value is greater than the second preset difference value, judging that the vehicle slips.
The first preset difference is smaller than the second preset difference.
Since the slip phenomenon of the vehicle during high-speed driving is severe during low-speed driving, it is necessary to distinguish between high-speed driving and low-speed driving in order to make a decision as to time.
Example 2
Referring to fig. 2, in an embodiment of the present invention, a method for controlling a motor of an electric vehicle further includes:
and S40, when the vehicle is judged to be slipped, alarming information is sent out to make the driver know.
Therefore, the driver can know the slip of the vehicle early so as to make a manual response, and meanwhile, the driver is prevented from mistakenly thinking that the vehicle breaks down.
Example 3
Referring to fig. 3, in an embodiment of the present invention, an apparatus for controlling a motor of an electric vehicle is designed based on the above method, and specifically, the apparatus includes:
an acquisition unit configured to acquire an actual vehicle speed of a vehicle;
further, the acquiring unit includes:
the acquisition subunit I is used for acquiring the driving distance of the vehicle in a period of time;
and the acquisition subunit II is used for calculating the actual vehicle speed according to the running distance and the numerical value of the time.
The checking unit is used for calculating the checking vehicle speed of the vehicle according to the transmission ratio and the actual rotating speed of the motor;
and the analysis execution unit is used for comparing the actual vehicle speed with the approved vehicle speed, judging whether the vehicle slips or not according to the difference value between the actual vehicle speed and the approved vehicle speed, and if so, cutting off the transmission connection between the motor and the accelerator pedal and simultaneously reducing the actual rotating speed of the motor.
Further, the analysis execution unit includes:
the analysis subunit is used for comparing the actual vehicle speed with a first vehicle speed preset value and a second vehicle speed preset value, wherein the first vehicle speed preset value is larger than the second vehicle speed preset value;
the judgment subunit I is used for comparing a difference value between the actual vehicle speed and the approved vehicle speed with a first preset difference value when the actual vehicle speed is greater than a second preset vehicle speed value and less than a first preset vehicle speed value, and judging that the vehicle slips when the difference value is greater than the first preset difference value;
the judgment subunit II is configured to compare a difference between the actual vehicle speed and the approved vehicle speed with a second preset difference when the actual vehicle speed is greater than a first vehicle speed preset value, and judge that the vehicle slips when the difference is greater than the second preset difference;
the first preset difference is smaller than the second preset difference.
Example 4
Referring to fig. 4, in an embodiment of the present invention, an apparatus for controlling a motor of an electric vehicle further includes:
and the alarm unit is used for sending alarm information when the vehicle is judged to skid.
Example 5
A computer storage medium, characterized in that the medium stores at least one instruction, and the at least one instruction is loaded and executed by a processor to implement the motor control method of the electric vehicle.
The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure, and all the changes or substitutions should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (5)
1. A motor control device for an electric vehicle, comprising:
an acquisition unit configured to acquire an actual vehicle speed of a vehicle;
the checking unit is used for calculating the checking vehicle speed of the vehicle according to the transmission ratio and the actual rotating speed of the motor;
the analysis execution unit is used for comparing the actual vehicle speed with the approved vehicle speed, judging whether the vehicle slips or not according to the difference value between the actual vehicle speed and the approved vehicle speed, and if so, cutting off the transmission connection between the motor and the accelerator pedal and simultaneously reducing the actual rotating speed of the motor;
the acquisition unit includes:
the acquisition subunit I is used for acquiring the driving distance of the vehicle in a period of time;
the acquiring subunit II is used for calculating the actual vehicle speed according to the running distance and the numerical value of the time;
the analysis execution unit includes:
the analysis subunit is used for comparing the actual vehicle speed with a first vehicle speed preset value and a second vehicle speed preset value, wherein the first vehicle speed preset value is larger than the second vehicle speed preset value;
the judgment subunit I is used for comparing a difference value between the actual vehicle speed and the approved vehicle speed with a first preset difference value when the actual vehicle speed is greater than a second preset vehicle speed value and less than a first preset vehicle speed value, and judging that the vehicle slips when the difference value is greater than the first preset difference value;
the judgment subunit II is configured to compare a difference between the actual vehicle speed and the approved vehicle speed with a second preset difference when the actual vehicle speed is greater than a first vehicle speed preset value, and judge that the vehicle slips when the difference is greater than the second preset difference;
the first preset difference is smaller than the second preset difference.
2. The motor control device of an electric vehicle according to claim 1, characterized by further comprising:
and the alarm unit is used for sending alarm information when the vehicle is judged to skid.
3. A motor control method of an electric automobile is characterized by comprising the following steps:
acquiring the actual speed of the vehicle;
the acquiring the actual vehicle speed of the vehicle comprises:
acquiring the driving distance of a vehicle in a period of time;
calculating the actual vehicle speed according to the running distance and the numerical value of the time;
calculating the approved vehicle speed of the vehicle according to the transmission ratio and the actual rotating speed of the motor;
comparing the actual vehicle speed with an approved vehicle speed, judging whether the vehicle slips or not according to the difference value between the actual vehicle speed and the approved vehicle speed, if so, cutting off the transmission connection between the motor and the accelerator pedal, and simultaneously reducing the actual rotating speed of the motor;
the judging whether the vehicle slips or not according to the difference value between the actual vehicle speed and the approved vehicle speed comprises the following steps:
comparing the actual vehicle speed with a first vehicle speed preset value and a second vehicle speed preset value, wherein the first vehicle speed preset value is larger than the second vehicle speed preset value;
when the actual vehicle speed is greater than a second vehicle speed preset value and smaller than a first vehicle speed preset value, comparing a difference value between the actual vehicle speed and the approved vehicle speed with a first preset difference value, and when the difference value is greater than the first preset difference value, judging that the vehicle slips;
when the actual vehicle speed is greater than a first vehicle speed preset value, comparing the difference value between the actual vehicle speed and the approved vehicle speed with a second preset difference value, and when the difference value is greater than the second preset difference value, judging that the vehicle slips;
the first preset difference is smaller than the second preset difference.
4. The motor control method of an electric vehicle according to claim 3, characterized by further comprising:
when judging that the vehicle skids, send alarm information so that the driver knows.
5. A computer storage medium storing at least one instruction, the at least one instruction being loaded and executed by a processor to implement the motor control method of an electric vehicle according to any one of claims 3 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910186685.6A CN109849690B (en) | 2019-03-13 | 2019-03-13 | Motor control method and control device for electric automobile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910186685.6A CN109849690B (en) | 2019-03-13 | 2019-03-13 | Motor control method and control device for electric automobile |
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| Publication Number | Publication Date |
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| CN109849690A CN109849690A (en) | 2019-06-07 |
| CN109849690B true CN109849690B (en) | 2022-04-15 |
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| CN201910186685.6A Active CN109849690B (en) | 2019-03-13 | 2019-03-13 | Motor control method and control device for electric automobile |
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2019
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| CN101074724A (en) * | 2006-05-15 | 2007-11-21 | 比亚迪股份有限公司 | Gear differential mechanism and system and method for compensating outputting torque |
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| CN109849690A (en) | 2019-06-07 |
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