CN111102350A - Method and device for controlling rotating speed of power source in vehicle gear shifting process - Google Patents
Method and device for controlling rotating speed of power source in vehicle gear shifting process Download PDFInfo
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- CN111102350A CN111102350A CN201811259528.5A CN201811259528A CN111102350A CN 111102350 A CN111102350 A CN 111102350A CN 201811259528 A CN201811259528 A CN 201811259528A CN 111102350 A CN111102350 A CN 111102350A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/04—Smoothing ratio shift
- F16H61/0403—Synchronisation before shifting
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Abstract
The application discloses a method and a device for controlling the rotating speed of a power source in the gear shifting process of a vehicle, wherein the method comprises the following steps: in response to a request to push a synchronizer into a target gear, obtaining a rate of change of a rotational speed of the first power source; determining a second target rotational speed of the second power source using the rate of change of the rotational speed of the first power source and the first target rotational speed of the second power source. Therefore, after the synchronizer requests to push the target gear, the second target rotating speed of the second power source can be determined according to the rotating speed change rate of the first power source, so that the rotating speed change direction of the second power source is the same as that of the first power source, and the synchronizer is guaranteed to smoothly push the target gear so as to complete gear shifting.
Description
Technical Field
The present disclosure relates to vehicle control, and more particularly to a method and apparatus for controlling a rotational speed of a power source during a shift operation of a vehicle.
Background
With the development of vehicle technology, some vehicles, such as new energy vehicles, are generally provided with a plurality of power sources in order to be able to provide maximum power to the vehicle. Some vehicles can realize gear shifting without a clutch at present.
In the gear shifting process, after the speed regulation of the power source is finished, the synchronization and pushing process of the synchronizer is strict, and the two ends of the synchronizer are required to keep the same rotating speed change trend. That is, it is necessary that the trend of change in the rotation speed of the first power source is the same as the trend of change in the rotation speed of the second power source. For example, if the rotation speed of the first power source is from slow to fast, the rotation speed of the second power source is from slow to fast; the rotating speed of the first power source is changed from fast to slow, and then the rotating speed of the second power source is also changed from fast to slow.
Therefore, it is necessary to provide a method for ensuring that two ends of the synchronizer keep the same rotating speed changing direction, so as to ensure that the synchronizer is smoothly pushed into a target gear, thereby realizing gear shifting.
Disclosure of Invention
The technical problem to be solved by the application is how to ensure that two ends of a synchronizer keep the same rotating speed change direction, thereby ensuring that the synchronizer is smoothly pushed into a target gear, and providing a method and a device for controlling the rotating speed of a power source in the gear shifting process of a vehicle.
In a first aspect, an embodiment of the present application provides a method of controlling a speed of a power source during a gear shift of a vehicle, the vehicle including a first power source and a second power source, the method comprising:
in response to a request to push a synchronizer into a target gear, obtaining a rate of change of a rotational speed of the first power source;
and determining a second target rotating speed of the second power source by using the rotating speed change rate of the first power source and the first target rotating speed of the second power source, so that the rotating speed change trend of the second power source is the same as that of the first power source.
Optionally, the determining a second target rotation speed of the second power source by using the rotation speed change rate of the first power source and the first target rotation speed of the second power source includes:
determining the compensation rotating speed of the second power source according to the rotating speed change rate of the first power source;
and obtaining the second target rotating speed by using the compensation rotating speed and the first target rotating speed.
Optionally, the determining the compensated rotation speed of the second power source according to the rotation speed change rate of the first power source includes:
if the rotating speed change rate of the first power source is larger than or equal to a first threshold value, determining the compensation rotating speed of the second power source as a first compensation rotating speed; wherein the first threshold is greater than 0 and the first compensation rotation speed is greater than 0; and/or the presence of a gas in the gas,
if the rotating speed change rate of the first power source is smaller than the first threshold value and is larger than or equal to a second threshold value, determining the compensation rotating speed of the second power source to be a second compensation rotating speed; wherein the second compensation rotating speed is greater than 0 and is less than the first compensation rotating speed; and/or the presence of a gas in the gas,
if the rotating speed change rate of the first power source is smaller than a third threshold value and is larger than or equal to a fourth threshold value, determining the compensation rotating speed of the second power source to be a third compensation rotating speed; wherein the third threshold is less than 0, the fourth threshold is less than 0, and the third compensation rotation speed is less than 0; and/or the presence of a gas in the gas,
if the rotating speed change rate of the first power source is smaller than the fourth threshold value, determining the compensation rotating speed of the second power source as a fourth compensation rotating speed; wherein the fourth compensation rotating speed is less than 0, and the fourth compensation rotating speed is less than the third compensation rotating speed; and/or the presence of a gas in the gas,
if the rotating speed change rate of the first power source is smaller than the second threshold and is larger than or equal to the third threshold, determining that the compensation rotating speed of the second power source is a fifth compensation rotating speed; wherein the fifth compensation rotation speed is 0.
Optionally, the third threshold is an inverse number of the second threshold, and the fourth threshold is an inverse number of the first threshold;
the third compensation rotating speed is the opposite number of the second compensation rotating speed, and the fourth compensation rotating speed is the opposite number of the first compensation rotating speed.
Optionally, the method further includes:
acquiring the current position of the synchronizer;
and if the distance between the current position of the synchronizer and the limit position of the synchronizer corresponding to the target gear is smaller than a preset threshold value, determining that the compensation rotating speed of the second power source is 0.
Optionally, the first target rotation speed of the second power source is obtained by:
acquiring the current rotating speed of the first power source in response to a request for pushing the synchronizer into the neutral position;
and obtaining a first target rotating speed of the second power source by using the target gear of the vehicle and the current rotating speed of the first power source.
Optionally, the obtaining a first target rotation speed of the second power source by using the target gear of the vehicle and the current rotation speed of the first power source includes:
if the target gear of the vehicle is the first gear, the first target rotating speed of the second power source is equal to the product of the current rotating speed of the first power source and a rotating speed coefficient;
and if the target gear of the vehicle is the second gear, the first target rotating speed of the second power source is equal to the current rotating speed of the first power source.
The speed coefficient is a ratio of a first speed ratio and a second speed ratio, the first speed ratio is a speed ratio corresponding to the first power source when the gear of the vehicle is the first gear, and the second speed ratio is a speed ratio corresponding to the first power source when the gear of the vehicle is the second gear.
In a second aspect, an embodiment of the present application provides an apparatus for controlling a rotational speed of a power source during a gear shift of a vehicle, the apparatus comprising:
an acquisition unit configured to acquire a rate of change of a rotation speed of the first power source in response to a request for a synchronizer to push into a target gear;
and the determining unit is used for determining a second target rotating speed of the second power source by utilizing the rotating speed change rate of the first power source and the first target rotating speed of the second power source, so that the rotating speed change trend of the second power source is the same as the rotating speed change trend of the first power source.
Optionally, the determining unit is specifically configured to:
determining the compensation rotating speed of the second power source according to the rotating speed change rate of the first power source;
and obtaining the second target rotating speed by using the compensation rotating speed and the first target rotating speed.
Optionally, the determining the compensated rotation speed of the second power source according to the rotation speed change rate of the first power source includes:
if the rotating speed change rate of the first power source is larger than or equal to a first threshold value, determining the compensation rotating speed of the second power source as a first compensation rotating speed; wherein the first threshold is greater than 0 and the first compensation rotation speed is greater than 0; and/or the presence of a gas in the gas,
if the rotating speed change rate of the first power source is smaller than the first threshold value and is larger than or equal to a second threshold value, determining the compensation rotating speed of the second power source to be a second compensation rotating speed; wherein the second compensation rotating speed is greater than 0 and is less than the first compensation rotating speed; and/or the presence of a gas in the gas,
if the rotating speed change rate of the first power source is smaller than a third threshold value and is larger than or equal to a fourth threshold value, determining the compensation rotating speed of the second power source to be a third compensation rotating speed; wherein the third threshold is less than 0, the fourth threshold is less than 0, and the third compensation rotation speed is less than 0; and/or the presence of a gas in the gas,
if the rotating speed change rate of the first power source is smaller than the fourth threshold value, determining the compensation rotating speed of the second power source as a fourth compensation rotating speed; wherein the fourth compensation rotating speed is less than 0, and the fourth compensation rotating speed is less than the third compensation rotating speed; and/or the presence of a gas in the gas,
if the rotating speed change rate of the first power source is smaller than the second threshold and is larger than or equal to the third threshold, determining that the compensation rotating speed of the second power source is a fifth compensation rotating speed; wherein the fifth compensation rotation speed is 0.
Optionally, the third threshold is an inverse number of the second threshold, and the fourth threshold is an inverse number of the first threshold;
the third compensation rotating speed is the opposite number of the second compensation rotating speed, and the fourth compensation rotating speed is the opposite number of the first compensation rotating speed.
Optionally, the obtaining unit is further configured to:
acquiring the current position of the synchronizer;
the determination unit is further configured to:
and if the distance between the current position of the synchronizer and the limit position of the synchronizer corresponding to the target gear is smaller than a preset threshold value, determining that the compensation rotating speed of the second power source is 0.
Optionally, the first target rotation speed of the second power source is obtained by:
acquiring the current rotating speed of the first power source in response to a request for pushing the synchronizer into the neutral position;
and obtaining a first target rotating speed of the second power source by using the target gear of the vehicle and the current rotating speed of the first power source.
Optionally, the obtaining a first target rotation speed of the second power source by using the target gear of the vehicle and the current rotation speed of the first power source includes:
if the target gear of the vehicle is the first gear, the first target rotating speed of the second power source is equal to the product of the current rotating speed of the first power source and a rotating speed coefficient;
and if the target gear of the vehicle is the second gear, the first target rotating speed of the second power source is equal to the current rotating speed of the first power source.
The speed coefficient is a ratio of a first speed ratio and a second speed ratio, the first speed ratio is a speed ratio corresponding to the first power source when the gear of the vehicle is the first gear, and the second speed ratio is a speed ratio corresponding to the first power source when the gear of the vehicle is the second gear.
Compared with the prior art, the embodiment of the application has the following advantages:
the embodiment of the application provides a method and a device for controlling the rotating speed of a power source in the gear shifting process of a vehicle, wherein the method comprises the following steps: in response to a request to push a synchronizer into a target gear, obtaining a rate of change of a rotational speed of the first power source; determining a second target rotational speed of the second power source using the rate of change of the rotational speed of the first power source and the first target rotational speed of the second power source. Therefore, after the synchronizer requests to push the target gear, the second target rotating speed of the second power source can be determined according to the rotating speed change rate of the first power source, so that the rotating speed change direction of the second power source is the same as that of the first power source, and the synchronizer is guaranteed to smoothly push the target gear so as to complete gear shifting.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic flow chart illustrating a method for controlling a rotational speed of a power source during a gear shift in a vehicle according to an embodiment of the present disclosure;
FIG. 2 is a schematic flow chart illustrating a method for determining a second target rotational speed of a second power source according to an embodiment of the present disclosure;
FIG. 3 is a schematic flow chart illustrating a method of determining a first target rotational speed of a second power source in accordance with an exemplary embodiment of the present disclosure;
FIG. 4 is a schematic flow chart illustrating a method for controlling a rotational speed of a power source during a shift in a vehicle according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of an apparatus for controlling a rotational speed of a power source during a gear shifting process of a vehicle according to an embodiment of the present disclosure.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The inventor of the application finds that in the prior art, after the speed regulation of a power source is finished in the gear shifting process, the requirements of the synchronizer on the synchronization and pushing process are strict, and the two ends of the synchronizer are required to keep the same rotating speed change trend. If the power source end is provided with the clutch, the change rate of the rotating speed of the gear shafts at the two ends of the synchronizer is smooth, and auxiliary compensation measures are not needed. If the power source end is not provided with a clutch, the vehicle still has acceleration in the gear shifting process, and one end of the synchronizer has a rotating speed change trend in the synchronizing process, so that the power source end of the synchronizer needs to provide corresponding compensation measures to keep speed difference, the risk of abrasion of the synchronizer is reduced, and the probability that the synchronizer cannot be smoothly moved in is greatly reduced. That is, it is necessary that the trend of change in the rotation speed of the first power source is the same as the trend of change in the rotation speed of the second power source. For example, if the rotation speed of the first power source is from slow to fast, the rotation speed of the second power source is from slow to fast; the rotating speed of the first power source is changed from fast to slow, and then the rotating speed of the second power source is also changed from fast to slow.
Therefore, it is necessary to provide a method for ensuring that two ends of the synchronizer keep the same rotating speed changing direction, so as to ensure that the synchronizer is smoothly pushed into a target gear, thereby realizing gear shifting.
In order to solve the above problem, an embodiment of the present application provides a method and an apparatus for controlling a rotational speed of a power source during a gear shifting process of a vehicle, where the method includes: in response to a request to push a synchronizer into a target gear, obtaining a rate of change of a rotational speed of the first power source; determining a second target rotational speed of the second power source using the rate of change of the rotational speed of the first power source and the first target rotational speed of the second power source. Therefore, after the synchronizer requests to push the target gear, the second target rotating speed of the second power source can be determined according to the rotating speed change rate of the first power source, so that the rotating speed change trend of the second power source is the same as that of the first power source, and the synchronizer is guaranteed to smoothly push the target gear so as to complete gear shifting.
Various non-limiting embodiments of the present application are described in detail below with reference to the accompanying drawings.
Exemplary method
For ease of understanding, the relevant contents of the vehicle mentioned in the embodiments of the present application will be described first.
The vehicle comprises two power sources, namely a first power source and a second power source; the transmission of the vehicle supports two gears, a first gear and a second gear.
The respective functions of the first and second power sources during a gear shift will be described below.
If the gear shifting requirement of the vehicle is detected, the second power source firstly performs torque reduction, and the corresponding first power source performs torque increase. After the second power source is twisted and bundled, the synchronizer is pushed into a neutral position, then the second power source starts to regulate speed, after the first target rotating speed is modulated, the synchronizer is pushed into a target gear, after the synchronizer is pushed into the target gear, the second power source starts to raise torque, correspondingly, the first power source starts to lower torque, and gear shifting is completed.
Referring to FIG. 1, a flowchart of a method for controlling a power source speed during a vehicle shift according to an embodiment of the present disclosure is shown.
In this embodiment, the method may be implemented, for example, by the following steps S101-S102.
S101: a rate of change of a rotational speed of the first power source is obtained in response to a request for a synchronizer to push into a target gear.
It should be noted that, the synchronizer pushes to the target gear, which indicates that the torque reduction process of the second power source is finished, and at this time, the rotation speed of the first power source is substantially synchronized with the rotation speed of the second power source.
It should be noted that the embodiment of the present application is not particularly limited to a specific implementation manner of obtaining the rotation speed change rate of the first power source, and as an example, a corresponding speed measuring device may be used to measure the real-time rotation speed of the first power source, so as to obtain the rotation speed change rate of the first power source.
S102: and determining a second target rotating speed of the second power source by using the rotating speed change rate of the first power source and the first target rotating speed of the second power source, so that the rotating speed change trend of the second power source is the same as that of the first power source.
As described above, when the synchronizer is pushed into the target gear, the torque reduction process of the second power source is already finished, and at this time, the rotation speed of the first power source is basically synchronous with that of the second power source. In the process that the synchronizer starts to push the target gear to the synchronizer, the rotating speed of the first power source is still changed, so that the rotating speed of one end of the synchronizer is always changed, therefore, in order to keep the same rotating speed change trend at the two ends of the synchronizer, the rotating speed change trend of the second power source is required to be the same as that of the first power source, and therefore the synchronizer is guaranteed to be smoothly pushed into the target gear, and gear shifting is finished. The second target rotating speed of the second power source may be determined according to the rotating speed change rate of the first power source, so as to control the rotating speed of the second power source to approach the second target rotating speed, so that the rotating speed change trend of the second power source is the same as the rotating speed change trend of the first power source.
It should be noted that the first target rotation speed mentioned in the embodiment of the present application refers to a target rotation speed of the second power source during the torque reduction process of the second power source.
Therefore, by the method provided by the embodiment of the application, after the synchronizer requests to push the target gear, the second target rotating speed of the second power source can be determined according to the rotating speed change rate of the first power source, so that the rotating speed change trend of the second power source is the same as that of the first power source, and the synchronizer is ensured to smoothly push the target gear so as to complete gear shifting.
In step S102, "determining the second target rotational speed of the second power source using the rate of change of the rotational speed of the first power source and the first target rotational speed of the second power source" may be implemented in the following steps S201 to S202.
S201: and determining the compensation rotating speed of the second power source according to the rotating speed change rate of the first power source.
It should be noted that, in the embodiment of the present application, the compensation rotational speed of the second power source is different when the rotational speed change rate of the first power source is different.
Specifically, the compensated rotational speed of the second power source may be determined in any one or more of the following ways.
First mode: and if the rotating speed change rate of the first power source is greater than or equal to a first threshold value, determining the compensation rotating speed of the second power source as a first compensation rotating speed.
It should be noted that the first threshold is a number greater than 0, and a specific value of the first threshold is not specifically limited in this embodiment. As an example, the first threshold is 400 revolutions per minute per second (rpmps).
It should be noted that the first compensation rotation speed is a number greater than 0, and the embodiment of the present application is not specifically limited with respect to the value of the first compensation rotation speed. As one example, the first compensated rotational speed may be 50 revolutions per minute (rpm).
The mode corresponds to the condition that the vehicle is in a large-accelerator accelerating and gear-up working condition, the rotating speed of the first power source rises sharply, at the moment, the compensation rotating speed can take a larger positive value, so that the second power source outputs a larger positive torque, the rotating speed change trends at two ends of the synchronizer are the same, and the synchronizer is pushed into a target gear smoothly.
Second mode: and if the rotating speed change rate of the first power source is smaller than a first threshold value and is larger than or equal to a second threshold value, determining the compensation rotating speed of the second power source as a second compensation rotating speed.
The second threshold is a number greater than 0, and the second threshold is smaller than the first threshold. The embodiment of the present application is not particularly limited with respect to the specific value of the second threshold. As an example, the second threshold may be 50 rpmps.
It should be noted that the second compensation rotation speed is a number greater than 0, and the second compensation rotation speed is smaller than the first compensation rotation speed. The value of the second compensation rotation speed is not specifically limited in the embodiment of the present application. As an example, the second compensation rotation speed may be 10 rpm.
This kind of mode is in little throttle acceleration upshift operating mode corresponding to the vehicle, and first power supply rotational speed rises gently, at this moment, can make the compensation rotational speed takes less positive value to make the less forward torque of second power supply output, thereby make the rotational speed variation trend at synchronizer both ends the same, the synchronizer pushes target gear smoothly.
The third mode is as follows:and if the rotating speed change rate of the first power source is smaller than a third threshold value and is larger than or equal to a fourth threshold value, determining the compensation rotating speed of the second power source as a third compensation rotating speed.
The third threshold is a number smaller than 0, the fourth threshold is a number smaller than 0, and the third threshold is larger than the fourth threshold. The specific values of the third threshold and the fourth threshold are not specifically limited in this embodiment. As an example, the third threshold is an inverse number of the second threshold, and the fourth threshold is an inverse number of the first threshold. For example, the third threshold is-50 rpmps and the fourth threshold is-400 rpmps.
It should be noted that the third compensation rotation speed is a number smaller than 0, and the value of the third compensation rotation speed is not specifically limited in the embodiment of the present application. As an example, the third compensation rotation speed may be an opposite number of the second compensation rotation speed. For example, the third compensated rotational speed may be-10 rpm.
The mode corresponds to the condition that the vehicle is in a small braking speed reduction downshift working condition, the rotating speed of the first power source is slowly reduced, at the moment, the compensation rotating speed can be made to be a small negative value, so that the second power source outputs small negative torque, the rotating speed change trends at two ends of the synchronizer are the same, and the synchronizer is smoothly pushed into a target gear.
The fourth mode is that:and if the rotating speed change rate of the first power source is smaller than a fourth threshold value, determining the compensation rotating speed of the second power source as a fourth compensation rotating speed.
For the description of the fourth threshold, reference may be made to the description part of the above third manner, and details are not repeated here.
It should be noted that the fourth compensation rotation speed is a number smaller than 0, and the fourth compensation rotation speed is smaller than the third compensation rotation speed. The value of the fourth compensation rotation speed is not specifically limited in the embodiment of the present application. As an example, the fourth compensation rotation speed may be an inverse number of the first compensation rotation speed. For example, the fourth compensated rotational speed may be-50 rpm.
In this way, the rotating speed of the first power source is sharply reduced corresponding to the condition that the vehicle is in a large braking deceleration downshift condition, and at the moment, the compensation rotating speed can be made to take a large negative value, so that the second power source outputs a large negative torque, the rotating speed change trends at the two ends of the synchronizer are the same, and the synchronizer is smoothly pushed into the target gear.
The fifth mode is as follows:and if the rotating speed change rate of the first power source is smaller than a second threshold value and is larger than or equal to a third threshold value, determining the compensation rotating speed of the second power source to be a fifth compensation rotating speed.
For the description of the second threshold and the third threshold, reference may be made to the description part of the above second manner and third manner, and details are not repeated here.
It should be noted that the fifth compensation rotation speed is a number close to 0, and the value of the fifth compensation rotation speed is not specifically limited in the embodiment of the present application. As an example, the fifth compensation rotational speed may be 0.
The mode corresponds to that the vehicle is in a large accelerator acceleration working condition, the small accelerator is immediately received after the gear-up line is triggered, the rotating speed of the first power source possibly has almost no change, at the moment, the value of the compensation rotating speed can be 0, so that the rotating speed change trends at two ends of the synchronizer are the same, and the synchronizer is smoothly pushed into a target gear.
With regard to the compensated rotational speed of the second power source corresponding to the above five cases, it can be understood by referring to table 1 below, and it should be noted that table 1 is only illustrative and does not limit the embodiments of the present application.
TABLE 1
S202: and obtaining the second target rotating speed by using the compensation rotating speed and the first target rotating speed.
In the embodiment of the present application, the sum of the first target rotational speed and the compensation rotational speed may be used as the second target rotational speed.
As mentioned above, the first target rotation speed is the target rotation speed of the second power source during the torque reduction process of the second power source.
It should be noted that, in one possible implementation, the first target rotational speed of the second power source may be achieved through the following steps S301 to S302.
S301: in response to a request for the synchronizer to push into neutral, a current rotational speed of the first power source is acquired.
It should be noted that after the synchronizer is pushed into the neutral position, the second power source starts to adjust the speed. And the governing target of the second power source, i.e. the first target rotational speed of the second power source, is related to the rotational speed of the first power source, so the current rotational speed of the first power source is obtained.
It should be noted that the embodiment of the present application is not particularly limited to the specific implementation manner of obtaining the current rotation speed of the first power source. As an example, the current rotational speed of the first power source may be obtained using a corresponding speed measuring device.
S302: and obtaining a first target rotating speed of the second power source by using the target gear of the vehicle and the current rotating speed of the first power source.
In the embodiment of the present application, the gears of the vehicle include a first gear and a second gear. The first power source is connected with an output shaft of a gearbox of the vehicle at a second gear fixed speed ratio, namely a second speed ratio. The second power source is connected with the output shaft of the gearbox in an unfixed speed ratio through gear shifting. When the gear of the vehicle is a first gear, the second power source is connected with the output shaft of the gearbox at a first speed ratio; and when the gear of the vehicle is a second gear, the second power source is connected with the output shaft of the gearbox at a second speed ratio. Wherein the speed ratio is indicative of an ability of the power source to output torque.
In a possible implementation manner of the embodiment of the application, the first gear is a 1-gear, and the second gear is a 2-gear. The first speed ratio corresponding to the first gear is greater than the 2 nd speed ratio corresponding to the second gear, and as an example, the first speed ratio may be 1.8 times the second speed ratio.
The first target rotational speed of the second power source may be represented by a product of an output shaft rotational speed of the second power source and a speed ratio of the target gear. The output shaft rotation speed of the second power source may be obtained by converting the rotation speed of the first power source, and specifically, the output shaft rotation speed of the second power source may be represented by a ratio of a current rotation speed of the first power source to a second speed ratio.
Therefore, if the target gear of the vehicle is the first gear, the first target rotating speed of the second power source is equal to the product of the current rotating speed of the first power source and the rotating speed coefficient; and if the target gear of the vehicle is the second gear, the first target rotating speed of the second power source is equal to the current rotating speed of the first power source.
The speed coefficient is a ratio of a first speed ratio and a second speed ratio, the first speed ratio is a speed ratio corresponding to the first power source when the gear of the vehicle is the first gear, and the second speed ratio is a speed ratio corresponding to the first power source when the gear of the vehicle is the second gear.
It should be noted that, in a possible implementation manner of the embodiment of the present application, the method may further include the following steps a-B:
step A: and acquiring the current position of the synchronizer.
It should be noted that the embodiment of the present application is not particularly limited to a specific implementation manner of obtaining the current position of the synchronizer, and as an example, the current position of the synchronizer may be obtained by a corresponding sensor.
And B: and if the distance between the current position of the synchronizer and the limit position of the synchronizer corresponding to the target gear is smaller than a preset threshold value, determining that the compensation rotating speed of the second power source is 0.
It should be noted that, if the distance between the current position of the synchronizer and the limit position of the synchronizer corresponding to the target gear is smaller than the preset distance, the rotational speed of the corresponding first power source and the rotational speed of the second power source at this time are indicated, and the synchronization process is finished, so that the synchronizer can be smoothly pushed into the target gear, and therefore, it can be determined that the compensation rotational speed of the second power source is 0.
It should be noted that, in the embodiment of the present application, a specific value of the preset threshold is not specifically limited, and the specific value of the preset threshold may be determined according to a specific situation of the transmission. As an example, the preset threshold is 5 mm.
The method for controlling the rotating speed of the power source in the vehicle gear shifting process provided by the embodiment of the application is introduced above, and the method provided by the embodiment of the application is introduced below by combining specific scenes.
Referring to FIG. 4, a flowchart of a method for controlling a power source speed during a vehicle shift event according to an embodiment of the present disclosure is shown.
The method provided by the embodiment of the application can be realized through the following steps S401 to S408, for example.
S401: and when the gear shifting requirement is detected, a torque reduction command is sent to the second power source, a torque increase command is sent to the first power source, and the target gear is obtained to be 2.
S402: the second power source starts to drop the torque, and the first power source starts to rise the torque.
S403: the torque down of the second power source is finished, and the current rotation speed r1 of the first power source is acquired in response to the request for pushing the synchronizer into the neutral position.
S404: determining a first target speed of the second power source as r1 according to the current speed of the first power source r1 and the target gear 2.
S405: the second power source enters a governing mode and governs with the first target speed r1 as the target.
S406: and acquiring the current rotating speed of a second power source, and determining that the difference value between the current rotating speed of the second power source and the first target rotating speed is smaller than a difference threshold value of 60 rpm.
It should be noted that, the difference between the current rotation speed of the second power source and the first target rotation speed is smaller than the difference threshold of 60rpm, which indicates that the rotation speed of the first power source and the rotation speed of the second power source are substantially synchronous, and at this time, the synchronizer may start to push into the target gear.
S407: in response to a request for a synchronizer to push into a target gear, it is acquired that the rate of change of the rotational speed of the first power source is 500 rpmps.
S408: determining a compensated rotational speed of the second power source to be 50rpm, and determining a second target rotational speed of the second power source to be (r1+50) rpm.
Therefore, by using the method provided by the embodiment of the application, after the synchronizer requests to push into the target gear, the second target rotating speed of the second power source can be determined according to the rotating speed change rate of the first power source, so that the rotating speed change direction of the second power source is the same as that of the first power source, and the synchronizer is ensured to smoothly push into the target gear so as to complete gear shifting.
Exemplary device
Referring to fig. 5, a schematic structural diagram of an apparatus for controlling a rotational speed of a power source during a gear shifting process of a vehicle according to an embodiment of the present disclosure is shown.
The apparatus 500 may specifically include, for example: an acquisition unit 510 and a determination unit 520.
An acquisition unit 510 that acquires a rate of change of a rotation speed of the first power source in response to a request for a synchronizer to push into a target gear;
a determining unit 520, configured to determine a second target rotation speed of the second power source by using the rotation speed change rate of the first power source and the first target rotation speed of the second power source, so that a rotation speed change trend of the second power source is the same as a rotation speed change trend of the first power source.
Optionally, the determining unit 520 is specifically configured to:
determining the compensation rotating speed of the second power source according to the rotating speed change rate of the first power source;
and obtaining the second target rotating speed by using the compensation rotating speed and the first target rotating speed.
Optionally, the determining the compensated rotation speed of the second power source according to the rotation speed change rate of the first power source includes:
if the rotating speed change rate of the first power source is larger than or equal to a first threshold value, determining the compensation rotating speed of the second power source as a first compensation rotating speed; wherein the first threshold is greater than 0 and the first compensation rotation speed is greater than 0; and/or the presence of a gas in the gas,
if the rotating speed change rate of the first power source is smaller than the first threshold value and is larger than or equal to a second threshold value, determining the compensation rotating speed of the second power source to be a second compensation rotating speed; wherein the second compensation rotating speed is greater than 0 and is less than the first compensation rotating speed; and/or the presence of a gas in the gas,
if the rotating speed change rate of the first power source is smaller than a third threshold value and is larger than or equal to a fourth threshold value, determining the compensation rotating speed of the second power source to be a third compensation rotating speed; wherein the third threshold is less than 0, the fourth threshold is less than 0, and the third compensation rotation speed is less than 0; and/or the presence of a gas in the gas,
if the rotating speed change rate of the first power source is smaller than the fourth threshold value, determining the compensation rotating speed of the second power source as a fourth compensation rotating speed; wherein the fourth compensation rotating speed is less than 0, and the fourth compensation rotating speed is less than the third compensation rotating speed; and/or the presence of a gas in the gas,
if the rotating speed change rate of the first power source is smaller than the second threshold and is larger than or equal to the third threshold, determining that the compensation rotating speed of the second power source is a fifth compensation rotating speed; wherein the fifth compensation rotation speed is 0.
Optionally, the third threshold is an inverse number of the second threshold, and the fourth threshold is an inverse number of the first threshold;
the third compensation rotating speed is the opposite number of the second compensation rotating speed, and the fourth compensation rotating speed is the opposite number of the first compensation rotating speed.
Optionally, the obtaining unit 510 may be further configured to:
acquiring the current position of the synchronizer;
the determining unit 520 may further be configured to:
and if the distance between the current position of the synchronizer and the limit position of the synchronizer corresponding to the target gear is smaller than a preset threshold value, determining that the compensation rotating speed of the second power source is 0.
Optionally, the first target rotation speed of the second power source is obtained by:
acquiring the current rotating speed of the first power source in response to a request for pushing the synchronizer into the neutral position;
and obtaining a first target rotating speed of the second power source by using the target gear of the vehicle and the current rotating speed of the first power source.
Optionally, the obtaining a first target rotation speed of the second power source by using the target gear of the vehicle and the current rotation speed of the first power source includes:
if the target gear of the vehicle is the first gear, the first target rotating speed of the second power source is equal to the product of the current rotating speed of the first power source and a rotating speed coefficient;
and if the target gear of the vehicle is the second gear, the first target rotating speed of the second power source is equal to the current rotating speed of the first power source.
The speed coefficient is a ratio of a first speed ratio and a second speed ratio, the first speed ratio is a speed ratio corresponding to the first power source when the gear of the vehicle is the first gear, and the second speed ratio is a speed ratio corresponding to the first power source when the gear of the vehicle is the second gear.
For specific implementation of each unit of the apparatus, reference may be made to the description in the above method embodiment, and details are not described here.
Therefore, by means of the device provided by the embodiment of the application, after the synchronizer requests to push the target gear, the second target rotating speed of the second power source can be determined according to the rotating speed change rate of the first power source, so that the rotating speed change direction of the second power source is the same as that of the first power source, the synchronizer is guaranteed to smoothly push the target gear, and gear shifting is completed.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice in the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A method of controlling a speed of a power source during a gear shift in a vehicle, the vehicle including a first power source and a second power source, the method comprising:
in response to a request to push a synchronizer into a target gear, obtaining a rate of change of a rotational speed of the first power source;
and determining a second target rotating speed of the second power source by using the rotating speed change rate of the first power source and the first target rotating speed of the second power source, so that the rotating speed change trend of the second power source is the same as that of the first power source.
2. The method of claim 1, wherein determining a second target rotational speed of the second power source using the rate of change of the rotational speed of the first power source and the first target rotational speed of the second power source comprises:
determining the compensation rotating speed of the second power source according to the rotating speed change rate of the first power source;
and obtaining the second target rotating speed by using the compensation rotating speed and the first target rotating speed.
3. The method of claim 2, wherein determining a compensated rotational speed of the second power source based on the rate of change of the rotational speed of the first power source comprises:
if the rotating speed change rate of the first power source is larger than or equal to a first threshold value, determining the compensation rotating speed of the second power source as a first compensation rotating speed; wherein the first threshold is greater than 0 and the first compensation rotation speed is greater than 0; and/or the presence of a gas in the gas,
if the rotating speed change rate of the first power source is smaller than the first threshold value and is larger than or equal to a second threshold value, determining the compensation rotating speed of the second power source to be a second compensation rotating speed; wherein the second compensation rotating speed is greater than 0 and is less than the first compensation rotating speed; and/or the presence of a gas in the gas,
if the rotating speed change rate of the first power source is smaller than a third threshold value and is larger than or equal to a fourth threshold value, determining the compensation rotating speed of the second power source to be a third compensation rotating speed; wherein the third threshold is less than 0, the fourth threshold is less than 0, and the third compensation rotation speed is less than 0; and/or the presence of a gas in the gas,
if the rotating speed change rate of the first power source is smaller than the fourth threshold value, determining the compensation rotating speed of the second power source as a fourth compensation rotating speed; wherein the fourth compensation rotating speed is less than 0, and the fourth compensation rotating speed is less than the third compensation rotating speed; and/or the presence of a gas in the gas,
if the rotating speed change rate of the first power source is smaller than the second threshold and is larger than or equal to the third threshold, determining that the compensation rotating speed of the second power source is a fifth compensation rotating speed; wherein the fifth compensation rotation speed is 0.
4. The method according to claim 3, wherein the third threshold is the inverse of the second threshold, and the fourth threshold is the inverse of the first threshold;
the third compensation rotating speed is the opposite number of the second compensation rotating speed, and the fourth compensation rotating speed is the opposite number of the first compensation rotating speed.
5. The method of claim 2, further comprising:
acquiring the current position of the synchronizer;
and if the distance between the current position of the synchronizer and the limit position of the synchronizer corresponding to the target gear is smaller than a preset threshold value, determining that the compensation rotating speed of the second power source is 0.
6. The method of claim 1, wherein the first target rotational speed of the second power source is obtained by:
acquiring the current rotating speed of the first power source in response to a request for pushing the synchronizer into the neutral position;
and obtaining a first target rotating speed of the second power source by using the target gear of the vehicle and the current rotating speed of the first power source.
7. The method of claim 6, wherein the gears of the vehicle include a first gear and a second gear, and the obtaining the first target rotational speed of the second power source using the target gear of the vehicle and the current rotational speed of the first power source comprises:
if the target gear of the vehicle is the first gear, the first target rotating speed of the second power source is equal to the product of the current rotating speed of the first power source and a rotating speed coefficient;
and if the target gear of the vehicle is the second gear, the first target rotating speed of the second power source is equal to the current rotating speed of the first power source.
The speed coefficient is a ratio of a first speed ratio and a second speed ratio, the first speed ratio is a speed ratio corresponding to the first power source when the gear of the vehicle is the first gear, and the second speed ratio is a speed ratio corresponding to the first power source when the gear of the vehicle is the second gear.
8. An apparatus for controlling a speed of a power source during a gear shift in a vehicle, the vehicle including a first power source and a second power source, the apparatus comprising:
an acquisition unit configured to acquire a rate of change of a rotation speed of the first power source in response to a request for a synchronizer to push into a target gear;
and the determining unit is used for determining a second target rotating speed of the second power source by utilizing the rotating speed change rate of the first power source and the first target rotating speed of the second power source, so that the rotating speed change trend of the second power source is the same as the rotating speed change trend of the first power source.
9. The apparatus according to claim 8, wherein the determining unit is specifically configured to:
determining the compensation rotating speed of the second power source according to the rotating speed change rate of the first power source;
and obtaining the second target rotating speed by using the compensation rotating speed and the first target rotating speed.
10. The apparatus of claim 8, wherein said determining a compensated rotational speed of the second power source based on a rate of change of a rotational speed of the first power source comprises:
if the rotating speed change rate of the first power source is larger than or equal to a first threshold value, determining the compensation rotating speed of the second power source as a first compensation rotating speed; wherein the first threshold is greater than 0 and the first compensation rotation speed is greater than 0; and/or the presence of a gas in the gas,
if the rotating speed change rate of the first power source is smaller than the first threshold value and is larger than or equal to a second threshold value, determining the compensation rotating speed of the second power source to be a second compensation rotating speed; wherein the second compensation rotating speed is greater than 0 and is less than the first compensation rotating speed; and/or the presence of a gas in the gas,
if the rotating speed change rate of the first power source is smaller than a third threshold value and is larger than or equal to a fourth threshold value, determining the compensation rotating speed of the second power source to be a third compensation rotating speed; wherein the third threshold is less than 0, the fourth threshold is less than 0, and the third compensation rotation speed is less than 0; and/or the presence of a gas in the gas,
if the rotating speed change rate of the first power source is smaller than the fourth threshold value, determining the compensation rotating speed of the second power source as a fourth compensation rotating speed; wherein the fourth compensation rotating speed is less than 0, and the fourth compensation rotating speed is less than the third compensation rotating speed; and/or the presence of a gas in the gas,
if the rotating speed change rate of the first power source is smaller than the second threshold and is larger than or equal to the third threshold, determining that the compensation rotating speed of the second power source is a fifth compensation rotating speed; wherein the fifth compensation rotation speed is 0.
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| CN201811259528.5A CN111102350B (en) | 2018-10-26 | 2018-10-26 | Method and device for controlling rotating speed of power source in vehicle gear shifting process |
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