CN115817187B - Method for recovering energy of hybrid vehicle - Google Patents
Method for recovering energy of hybrid vehicle Download PDFInfo
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- CN115817187B CN115817187B CN202211632747.XA CN202211632747A CN115817187B CN 115817187 B CN115817187 B CN 115817187B CN 202211632747 A CN202211632747 A CN 202211632747A CN 115817187 B CN115817187 B CN 115817187B
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Abstract
The invention discloses an energy recovery method of a hybrid electric vehicle, and relates to the technical field of hybrid electric vehicles. The energy recovery method of the hybrid vehicle includes the steps of: when the hybrid vehicle runs in the electric-only mode, it is determined whether the driver is stepping on the brake or not when the driver is not stepping on the accelerator. When the driver does not step on the brake, the motor rotating speed is monitored, the motor rotating speed is divided into different stages from low to high in advance, different motor braking torques are set in each stage, and the braking torque of the motor is determined according to the real-time rotating speed of the motor so as to recover the braking energy of the motor. According to the energy recovery method of the hybrid power vehicle, different braking torques are controlled by the motor in a sectionalized mode according to the rotating speed of the motor, so that the braking torque is prevented from suddenly changing and is smoothly transited when the hybrid power vehicle recovers energy through motor braking, smoothness of the hybrid power vehicle is guaranteed, and the feeling of a driver is improved.
Description
Technical Field
The invention relates to the technical field of hybrid vehicles, in particular to an energy recovery method of a hybrid vehicle.
Background
The hybrid vehicle can recover energy through an electric motor while descending a slope, and convert the recovered braking energy into electric energy to save energy.
In the prior art, energy recovery of a hybrid vehicle is performed by inquiring a MAP or a set curve according to a vehicle speed or a brake opening, and the MAP or the set curve is formulated with a set gradient. Therefore, the braking torque of the motor in the existing scheme is relatively fixed and cannot be applied to all loads and gradients. Particularly, a vehicle not provided with a gradient sensor is easy to adapt to a small gradient and easy to overspeed in a large gradient; or a large grade is suitable, and the vehicle is decelerated too fast when the grade is small or the road is flat.
Disclosure of Invention
The invention aims to provide an energy recovery method for a hybrid vehicle, which is applicable no matter whether a gradient sensor is arranged or not, and can ensure that the braking torque of the hybrid vehicle cannot be suddenly changed, smoothly transits, ensure the smoothness of the hybrid vehicle and improve the feeling of a driver.
To achieve the purpose, the invention adopts the following technical scheme:
an energy recovery method of a hybrid vehicle, comprising the steps of:
When the hybrid vehicle runs in the pure electric mode, judging whether the driver steps on a brake or not under the condition that the driver does not step on an accelerator;
When the driver does not step on the brake, the motor rotating speed is monitored, the motor rotating speed is divided into different stages from low to high in advance, different motor braking torques are set in each stage, and the braking torque of the motor is determined according to the real-time rotating speed of the motor so as to recover the braking energy of the motor.
As an alternative to the energy recovery method of the hybrid vehicle, when the rotational speed of the motor is equal to or less than the first rotational speed, controlling the motor to perform energy recovery at a first set torque;
When the rotating speed of the motor is larger than the first rotating speed and smaller than or equal to the early warning rotating speed, controlling the motor to recover energy with a second set torque, wherein the second set torque is larger than the first set torque;
And when the motor rotating speed is larger than the early warning rotating speed, controlling the motor to recover energy according to the allowable maximum torque.
As an alternative to the energy recovery method of the hybrid vehicle, when the motor rotation speed exceeds the warning rotation speed, the hybrid vehicle is controlled to be converted from the electric-only mode to the hybrid mode, and braking is performed together by engine auxiliary braking and motor braking.
As an alternative to the energy recovery method of the hybrid vehicle, the engine speed is lower than the set safe speed when braking is performed by the engine auxiliary brake and the motor brake together.
As an alternative to the energy recovery method of the hybrid vehicle, when the driver steps on the brake, the brake opening degree is monitored, the brake opening degree is divided into different stages from small to large in advance, different motor brake torques are set in each stage, and the brake torque of the motor is determined according to the real-time opening degree of the brake so as to recover the brake energy of the motor.
As an alternative to the energy recovery method of the hybrid vehicle, when the brake opening is equal to or smaller than the first opening, controlling the motor to perform energy recovery with a third set torque;
when the brake opening is larger than the first opening and smaller than or equal to the middle opening, controlling the motor to recover energy with a fourth set torque, wherein the fourth set torque is larger than the third set torque;
And when the brake opening is larger than the middle opening and smaller than or equal to the maximum opening, controlling the motor to recover energy with a fifth set torque, wherein the fifth set torque is larger than the fourth set torque.
As an alternative to the energy recovery method of the hybrid vehicle, when the driver steps on the brake, the motor rotation speed is monitored while the brake opening is monitored, and when the motor performs energy recovery with the third set torque, if the motor rotation speed is greater than the first set rotation speed, the hybrid vehicle is controlled to be converted from the electric-only mode to the hybrid mode.
As an alternative to the energy recovery method of the hybrid vehicle, when the motor recovers energy with the fourth set torque, if the motor rotation speed is greater than a second set rotation speed, the hybrid vehicle is controlled to be converted from the electric-only mode to the hybrid mode, and the second set rotation speed is smaller than the first set rotation speed.
As an alternative to the method for recovering energy of the hybrid vehicle, when the electric motor recovers energy with the fifth set torque, if the rotational speed of the electric motor is greater than a third set rotational speed, the hybrid vehicle is controlled to be converted from the electric-only mode to the hybrid mode, and the third set rotational speed is less than the second set rotational speed.
As an alternative of the energy recovery method of the hybrid vehicle, when the brake opening is greater than the maximum opening, controlling the motor to perform energy recovery with a sixth set torque, the sixth set torque being greater than the fifth set torque, and the sixth set torque being at most the maximum torque allowed by the motor; or, controlling the hybrid vehicle to be converted from the electric-only mode to the hybrid mode.
As an alternative to the energy recovery method of the hybrid vehicle, when the brake opening is greater than the maximum opening, if the motor rotation speed is equal to or less than the engine idle speed, the electric-only mode is maintained, and the motor is controlled to perform energy recovery with the sixth set torque; and if the motor rotating speed is larger than a fourth set rotating speed, controlling the hybrid electric vehicle to be converted into a hybrid power mode from a pure electric mode, wherein the fourth set rotating speed is smaller than the third set rotating speed.
The invention has the beneficial effects that:
According to the energy recovery method of the hybrid power vehicle, when the hybrid power vehicle runs in the pure electric mode, the motor braking is controlled according to whether the driver steps on the braking or not, so that energy is recovered. When the driver does not step on the brake, namely the hybrid vehicle slides, the motor rotating speed is monitored, the motor rotating speed is divided into different stages from low to high in advance, different motor braking torques are set in each stage, and the braking torque of the motor is determined according to the real-time rotating speed of the motor so as to recover the braking energy of the motor. In the process of vehicle sliding and in the process of increasing the vehicle speed, the motor rotating speed is continuously increased, and the larger the motor rotating speed is, the larger the set motor braking torque is, so that the braking force is gradually increased in a segmented mode according to the real-time rotating speed of the motor until the motor rotating speed is stable or the motor rotating speed is switched to a hybrid power mode in an overspeed mode. According to the energy recovery method of the hybrid power vehicle, different braking torques are controlled by the motor in a sectionalized mode according to the rotating speed of the motor, so that the braking torque is prevented from suddenly changing and is smoothly transited when the hybrid power vehicle recovers energy through motor braking, smoothness of the hybrid power vehicle is guaranteed, and the feeling of a driver is improved.
Drawings
Fig. 1 is a flowchart of an energy recovery method of a hybrid vehicle provided by an embodiment of the present invention;
FIG. 2 is a flow chart of a method for energy recovery for a hybrid vehicle when the driver is not stepping on the brake, provided by an embodiment of the present invention;
Fig. 3 is a flowchart of an energy recovery method of a hybrid vehicle when a driver steps on a brake, according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "fixed" are to be construed broadly, and may be, for example, either fixed or removable; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Unless expressly stated or limited otherwise, a first feature being "above" or "below" a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
As shown in fig. 1, the present embodiment provides an energy recovery method of a hybrid vehicle, including the steps of:
And S10, when the hybrid vehicle runs in the pure electric mode, judging whether the driver steps on the brake or not under the condition that the driver does not step on the accelerator.
Energy recovery can be realized only when the motor is braked, so that energy is saved. Therefore, the hybrid vehicle preferentially uses the electric-only mode in the case where the battery level is sufficient. In normal driving, the driver steps on the accelerator to ensure that the hybrid vehicle runs at a certain speed. When deceleration is required, the accelerator is released, and therefore, the state in which the accelerator is released by the driver is regarded as the deceleration required. If the driver does not step on the accelerator, the hybrid vehicle comprises two states of sliding and braking, and in general, if the driver immediately steps on the brake after releasing the accelerator, the requirement of the hybrid vehicle on larger braking force is shown; and after the driver releases the accelerator, the driver does not step on the brake, so that the vehicle speed required by the hybrid vehicle can be achieved by means of sliding. And during sliding and braking, the energy of motor braking can be recovered. Therefore, in the embodiment, after the driver releases the accelerator, the motor braking energy is recovered in a sliding state and a braking state. Therefore, it is necessary to determine whether the driver is stepping on the brake.
And S20, when the driver does not step on the brake, monitoring the motor rotation speed, dividing the motor rotation speed into different stages from low to high in advance, setting different motor braking torques in each stage, and determining the braking torque of the motor according to the real-time rotation speed of the motor so as to recover the braking energy of the motor.
When the driver does not step on the brake, i.e. the hybrid vehicle is in a coasting state, the motor speed is monitored. The higher the speed of the hybrid vehicle, the higher the rotational speed of the motor, and the greatest force is provided, at which time the hybrid vehicle changes the running direction of the motor to provide braking force in order to decelerate, and the higher the rotational speed of the motor, the greater the braking torque required. By segmenting the motor rotation speed from low to high in advance, each segment corresponds to different motor braking torques, and the motor rotation speed is higher, the motor braking torque is larger, so that the braking torque borne by the hybrid electric vehicle is gradually increased along with the gradual increase of the motor rotation speed, the braking torque borne by the hybrid electric vehicle is ensured not to be suddenly changed, the smooth transition is ensured, the smoothness of the hybrid electric vehicle is ensured, and the feeling of a driver is improved.
As shown in fig. 2, specifically, when the driver does not step on the brake, the energy recovery method of the hybrid vehicle includes the steps of:
And S21, when the rotating speed of the motor is less than or equal to the first rotating speed, controlling the motor to recover energy with the first set torque.
The first rotating speed is greater than the lowest rotating speed of the motor, when the rotating speed of the motor is smaller than or equal to the first rotating speed, namely, the rotating speed of the motor is lower, the speed of the hybrid vehicle is lower, the first set torque is the braking torque set when the hybrid vehicle is in a normal working condition, and the normal working condition refers to that the hybrid vehicle is in a flat road sliding state. The first rotational speed and the first set torque can be set specifically by those skilled in the art according to the actual circumstances.
And S22, when the rotating speed of the motor is larger than the first rotating speed and smaller than or equal to the early warning rotating speed, controlling the motor to recover energy with a second set torque, wherein the second set torque is larger than the first set torque.
Each motor is provided with an early warning rotating speed so as to prevent the motor from running at a higher rotating speed for a long time and reduce the service life of the motor. When the rotation speed of the motor is larger than the first rotation speed and smaller than or equal to the early warning rotation speed, the rotation speed of the motor is in a normal rotation speed range, but is larger than the first rotation speed, the speed of the hybrid vehicle is reduced, and the motor needs larger braking torque relative to the first set torque, so that the motor is controlled to recover energy with the second set torque.
And S23, when the rotating speed of the motor is larger than the early warning rotating speed, controlling the motor to recover energy with the allowable maximum torque.
When the rotating speed of the motor is larger than the early warning rotating speed, the fact that the speed of the hybrid power vehicle is higher at the moment is indicated, and the motor is required to recover energy according to the maximum allowable torque. The maximum torque allowed by the motor is related to the current states of the motor, the battery, the gearbox and the rear axle, and can be calculated by a person skilled in the art according to practical situations, and the specific calculation method is already the prior art and is not described herein.
And S24, when the motor rotation speed exceeds the alarm rotation speed, controlling the hybrid electric vehicle to be converted into a hybrid power mode from a pure electric mode, and braking by engine auxiliary braking and motor braking.
The warning rotating speed is greater than the early warning rotating speed, and in the sliding process of the hybrid vehicle, if the motor rotating speed is continuously increased, when the motor rotating speed exceeds the warning rotating speed, the motor is independently braked, so that the braking requirement of the hybrid vehicle cannot be met. In order to ensure safety, the hybrid vehicle should be immediately controlled to be converted into a hybrid mode, and the vehicle is braked by engine auxiliary braking and motor braking together.
In order to ensure the safety of the engine, the engine speed is lower than the set safety speed when braking is performed by the engine auxiliary brake and the motor brake together. When the motor speed exceeds the alarm speed, the motor is automatically switched to a hybrid power mode so as to ensure the safety of the motor, and when the engine auxiliary brake and the motor are used for braking together, the engine speed is ensured to be lower than the set safety speed, the safety of the engine is ensured, and the safety performance of the hybrid power vehicle is ensured.
And S30, when a driver steps on the brake, monitoring the brake opening, dividing the brake opening into different stages from small to large in advance, setting different motor braking torques in each stage, and determining the braking torque of the motor according to the real-time opening of the brake so as to recover the braking energy of the motor.
When the driver steps on the brake and the hybrid vehicle is in a braking state, in the process of increasing the vehicle speed, the driver continuously increases the brake opening, controls different braking torques of the motor in a sectionalized manner according to the real-time opening of the brake, and the larger the brake opening is, the larger the braking torque of the motor is, so as to realize the smoothness of the braking of the hybrid vehicle.
Specifically, as shown in fig. 3, when the driver steps on the brake, the energy recovery method of the hybrid vehicle includes the steps of:
and S31, when the brake opening is smaller than or equal to the first opening, controlling the motor to recover energy with a third set torque.
The first opening is larger than the minimum opening of the brake opening, but in the case of a smaller opening, the motor brakes with a normal braking torque, the specific value of the first opening can be set according to the actual situation by a person skilled in the art, and the third setting torque can be set empirically by a person skilled in the art.
When a driver steps on a brake, the motor rotating speed is monitored while the brake opening degree is monitored, so that the motor rotating speed is prevented from being too high, and the requirement of the braking force of the hybrid vehicle cannot be met. When the motor carries out energy recovery with the third set torque, if the rotating speed of the motor is larger than the first set rotating speed, the hybrid electric vehicle is controlled to be converted into a hybrid electric mode from a pure electric mode.
When the motor rotation speed is higher than the first set rotation speed, the motor braking of the braking force required by the hybrid electric vehicle is not satisfied, and the engine auxiliary braking and the motor braking are required to be jointly braked.
And S32, when the brake opening is larger than the first opening and smaller than or equal to the middle opening, controlling the motor to recover energy with a fourth set torque, wherein the fourth set torque is larger than the third set torque.
The larger the brake opening is, the larger the required braking torque is, so as the brake opening is increased, the braking torque of the motor is controlled to be gradually increased in stages, the braking force required by the hybrid vehicle is met, and the braking smoothness of the hybrid vehicle is improved.
And when the motor recovers energy by the fourth set torque, if the motor rotating speed is larger than the second set rotating speed, controlling the hybrid electric vehicle to be converted into the hybrid electric mode from the pure electric mode, wherein the second set rotating speed is smaller than the first set rotating speed.
The larger the brake opening degree is, the larger the required motor braking torque is, and the lower the rotation speed threshold value of the motor for switching the hybrid power is, and therefore, the second set rotation speed is smaller than the first set rotation speed.
The intermediate opening degree here means only an opening degree between a value larger than the first set opening degree and smaller than the maximum opening degree, and is not limited to a specific value of the intermediate opening degree.
And S33, when the brake opening is larger than the middle opening and smaller than or equal to the maximum opening, controlling the motor to recover energy with a fifth set torque, wherein the fifth set torque is larger than the fourth set torque.
When the brake opening degree is between the intermediate opening degree and the maximum opening degree, the brake torque of the motor is increased to the fifth set torque.
And when the motor recovers energy with the fifth set torque, if the motor rotating speed is larger than the third set rotating speed, controlling the hybrid vehicle to be converted into the hybrid power mode from the pure electric mode, wherein the third set rotating speed is smaller than the second set rotating speed.
S34, when the brake opening is larger than the maximum opening, controlling the motor to recover energy with a sixth set torque, wherein the sixth set torque is larger than the fifth set torque, and the maximum torque of the sixth set torque is the maximum torque allowed by the motor; or, the hybrid vehicle is controlled to be converted from the electric-only mode to the hybrid mode.
When the brake opening is larger than the maximum opening, the engine is ensured not to be blocked. If the rotation speed of the motor is less than or equal to the idle speed of the engine, the engine may be blocked, and the pure electric mode is maintained at this time, so as to control the motor to perform energy recovery with a sixth set torque, thereby preventing the engine from being blocked.
When the brake opening is larger than the maximum opening, if the motor rotating speed is larger than the fourth set rotating speed, the motor rotating speed is at a higher rotating speed, and the engine is not blocked, so that the hybrid electric vehicle is controlled to be converted into a hybrid electric mode from a pure electric mode. The fourth set rotational speed is smaller than the third set rotational speed, and the larger the brake opening degree is, the smaller the fourth set rotational speed is. Regarding the fourth set rotational speed, one skilled in the art can specifically set according to the maximum opening degree of the engine and the brake.
When the brake opening is larger than the maximum opening and the motor rotation speed is lower, the speed of the vehicle is reduced to be very low, the vehicle is kept in a pure electric mode for preventing the engine from being blocked, the motor is controlled to recover energy with a sixth set torque, and the sixth set torque can be the maximum allowable torque of the motor.
When the hybrid power vehicle is switched to the hybrid power mode, auxiliary braking and motor braking of the engine are reasonably coordinated, so that the motor rotating speed of the hybrid power vehicle is ensured to be lower than the set rotating speed, and the vehicle speed is ensured to be lower than the set vehicle speed. The set rotational speed is the rotational speed of the motor when the hybrid vehicle is traveling normally, and the set vehicle speed is the vehicle speed when the hybrid vehicle is traveling normally.
According to the energy recovery method for the hybrid electric vehicle, when the hybrid electric vehicle slides, the motor braking force is gradually increased according to different motor braking torques set from low to high in a sectional mode until the motor speed is stable or the motor overspeed is automatically switched to a hybrid mode. When the hybrid power vehicle brakes, according to different motor braking torques which are set from small to large in sections of the braking opening degree, the motor braking force is gradually increased, and the larger the braking opening degree is, the larger the motor braking torque is, and the lower the motor rotating speed threshold value switched to the hybrid mode is. According to the energy recovery method for the hybrid electric vehicle, different braking torques are controlled on the motor in a segmented mode according to the rotating speed and the braking opening degree of the motor, when the hybrid electric vehicle recovers energy through motor braking, the braking torques are prevented from suddenly changing, smooth transition is achieved, smoothness of the hybrid electric vehicle is guaranteed, and the feeling of a driver is improved.
The foregoing is merely exemplary of the present invention, and those skilled in the art should not be considered as limiting the invention, since modifications may be made in the specific embodiments and application scope of the invention in light of the teachings of the present invention.
Claims (7)
1. The method for recovering energy of the hybrid vehicle is characterized by comprising the following steps:
When the hybrid vehicle runs in the pure electric mode, judging whether the driver steps on a brake or not under the condition that the driver does not step on an accelerator;
when a driver does not step on the brake, monitoring the rotating speed of the motor, dividing the rotating speed of the motor into different stages from low to high in advance, setting different motor braking torques in each stage, and determining the braking torque of the motor according to the real-time rotating speed of the motor so as to recover the braking energy of the motor;
When a driver steps on a brake, monitoring the brake opening, dividing the brake opening into different stages from small to large in advance, setting different motor braking torques in each stage, and determining the braking torque of the motor according to the real-time opening of the brake so as to recover the braking energy of the motor;
when the brake opening is smaller than or equal to the first opening, controlling the motor to recover energy with a third set torque;
when the brake opening is larger than the first opening and smaller than or equal to the middle opening, controlling the motor to recover energy with a fourth set torque, wherein the fourth set torque is larger than the third set torque;
when the brake opening is larger than the middle opening and smaller than or equal to the maximum opening, controlling the motor to recover energy with a fifth set torque, wherein the fifth set torque is larger than the fourth set torque;
When a driver steps on a brake, monitoring the motor rotating speed while monitoring the brake opening, and when the motor recovers energy with the third set torque, if the motor rotating speed is larger than the first set rotating speed, controlling the hybrid electric vehicle to be converted into a hybrid power mode from a pure electric mode;
And when the motor carries out energy recovery with the fourth set torque, if the motor rotating speed is larger than a second set rotating speed, controlling the hybrid electric vehicle to be converted into a hybrid power mode from a pure electric mode, wherein the second set rotating speed is smaller than the first set rotating speed.
2. The energy recovery method of a hybrid vehicle according to claim 1, characterized in that when the motor rotation speed is equal to or less than a first rotation speed, the motor is controlled to perform energy recovery at a first set torque;
When the rotating speed of the motor is larger than the first rotating speed and smaller than or equal to the early warning rotating speed, controlling the motor to recover energy with a second set torque, wherein the second set torque is larger than the first set torque;
And when the motor rotating speed is larger than the early warning rotating speed, controlling the motor to recover energy according to the allowable maximum torque.
3. The energy recovery method of a hybrid vehicle according to claim 2, characterized by controlling the hybrid vehicle to be converted from an electric-only mode to a hybrid mode and to perform braking together by engine-assisted braking and motor braking when the motor rotation speed exceeds an alarm rotation speed.
4. The energy recovery method of a hybrid vehicle according to claim 3, wherein an engine speed is lower than a set safe speed when braking is performed by the engine auxiliary brake and the motor brake together.
5. The method according to claim 1, characterized in that when the motor performs energy recovery at the fifth set torque, if the motor rotation speed is greater than a third set rotation speed, the hybrid vehicle is controlled to be converted from an electric-only mode to a hybrid mode, the third set rotation speed being smaller than the second set rotation speed.
6. The energy recovery method of a hybrid vehicle according to claim 5, characterized in that when the brake opening is greater than the maximum opening, the motor is controlled to perform energy recovery with a sixth set torque, the sixth set torque being greater than the fifth set torque, and the sixth set torque being at most a maximum torque allowed by the motor; or, controlling the hybrid vehicle to be converted from the electric-only mode to the hybrid mode.
7. The energy recovery method of a hybrid vehicle according to claim 6, characterized in that when the brake opening degree is greater than the maximum opening degree, if the motor rotation speed is equal to or less than an engine idle speed, the electric-only mode is maintained, and the motor is controlled to perform energy recovery at the sixth set torque; and if the motor rotating speed is larger than a fourth set rotating speed, controlling the hybrid electric vehicle to be converted into a hybrid power mode from a pure electric mode, wherein the fourth set rotating speed is smaller than the third set rotating speed.
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