CN111853225A - Automatic transmission synchronous force self-learning closed-loop control method and system and vehicle - Google Patents
Automatic transmission synchronous force self-learning closed-loop control method and system and vehicle Download PDFInfo
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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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- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D23/00—Details of mechanically-actuated clutches not specific for one distinct type
- F16D23/02—Arrangements for synchronisation, also for power-operated clutches
- F16D23/025—Synchro rings
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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
- F16H2061/0075—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 characterised by a particular control method
- F16H2061/0087—Adaptive control, e.g. the control parameters adapted by learning
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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
- F16H2061/0075—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 characterised by a particular control method
- F16H2061/0096—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 characterised by a particular control method using a parameter map
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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
- F16H2061/0459—Smoothing ratio shift using map for shift parameters, e.g. shift time, slip or pressure gradient, for performing controlled shift transition and adapting shift parameters by learning
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
Abstract
The invention discloses a synchronous force self-learning closed-loop control method and a system of an automatic transmission and a vehicle, wherein the method comprises the following steps: when a synchronizer synchronization request is received, acquiring a synchronization force coefficient of a synchronizer; acquiring the current drag torque, synchronizer and transmission parameters of the transmission; calculating synchronous force according to the synchronous force coefficient, the drag torque, the synchronizer and the transmission parameter; synchronizing the rotation speeds of the input shaft and the output shaft; judging whether the difference value of the rotating speeds of the input shaft and the output shaft is smaller than a difference threshold value or not; if the difference value is not smaller than the difference value threshold value, returning to the step of obtaining the current drag torque, the synchronizer and the transmission parameters of the transmission; and if the difference value is smaller than the difference value threshold value, the synchronization of the synchronizer and the combination teeth is completed. The calculation method of the synchronizing force is more accurate, better gear shifting performance is realized, gear shifting noise is reduced, NVH performance of the vehicle is improved, and driving performance and comfort of the vehicle are improved; in addition, the durability and reliability of the transmission, particularly the synchronizer, are improved.
Description
Technical Field
The invention relates to the technical field of transmissions, in particular to a synchronous force self-learning closed-loop control method and system for an automatic transmission and a vehicle.
Background
The gear shifting system consists of a gear shifting executing mechanism (divided into a hydraulic system and an electric control system), a shifting fork, a synchronizer and driven gear combination teeth. The synchronizer is composed of a synchronizer gear sleeve, a gear hub and a synchronizing ring. The gear shifting actuating mechanism controls the movement of the shifting forks with different gears. The shifting fork pushes the synchronizer gear sleeve to move horizontally, and then the synchronizer gear sleeve is meshed with the driven gear combination teeth. The torque and the rotating speed at the end of the engine are transmitted to the input shaft, the driving gear is meshed with the driven gear, the input shaft and the output shaft ensure torque transmission, and the torque and the rotating speed are output to the output shaft and then transmitted to the wheel end of the vehicle, so that the torque increasing and speed reducing functions of the transmission are realized.
When different speed ratios or gear shifting of the transmission are realized, the synchronizing force of the synchronizer is most prominent in gear shifting. Because the synchronizer ensures that the rotating speed of the input shaft is synchronized to the consistent rotating speed of the output shaft, the vehicle can smoothly shift gears. In the prior art, various control modes are used for controlling the synchronous position of a synchronizer in the gear shifting process, for example, the self-learning identification of the gear selecting information and the gear shifting information of the synchronizer is realized by controlling the forward and reverse rotation of a gear selecting and gear shifting motor, identifying the state that the synchronizer reaches the limit position by monitoring the voltage change of a gear selecting and gear shifting position sensor, and recording the voltage value of the position sensor when the synchronizer is at each limit position.
However, in the prior art, the synchronous force of the transmission is calculated only according to a theoretical set threshold value, and good closed-loop learning control is not achieved according to the transmissions with different designs and the actual operation of the whole vehicle and the transmission, so that reasonable and effective synchronous force control is not performed. Therefore, it is necessary to provide a synchronous force self-learning closed-loop control method and system for an automatic transmission and a vehicle to solve the above technical problems.
Disclosure of Invention
The invention aims to provide a synchronous force self-learning closed-loop control method and system of an automatic transmission and a vehicle, which are used for overcoming the technical problems in the background art.
The invention is realized by the following technical scheme:
the invention provides a synchronous force self-learning closed-loop control method of an automatic transmission on the one hand, which comprises the following steps:
when a synchronizer synchronization request is received, acquiring a synchronization force coefficient of a synchronizer;
acquiring the current drag torque of the transmission, the elastic force of a slider of a synchronizer, the rotational inertia of an input shaft, the rotational speed of an output shaft and the rotational speed of the input shaft before synchronization;
calculating a synchronous force according to the synchronous force coefficient, the drag torque, the elastic force of the synchronizer sliding block, the rotational inertia of the input shaft, the rotating speed of the output shaft and the rotating speed of the input shaft before synchronization;
Synchronizing the rotating speeds of the input shaft and the output shaft according to the synchronizing force, and judging whether the difference value between the rotating speed of the output shaft and the rotating speed of the synchronized input shaft is smaller than a preset difference threshold value or not;
if the difference value is not less than the difference value threshold value, returning to the step of acquiring the current drag torque of the transmission, the elastic force of a slider of the synchronizer, the rotational inertia of the input shaft, the rotational speed of the output shaft and the rotational speed of the input shaft before synchronization; and if the difference value is smaller than the difference value threshold value, the synchronization of the synchronizer and the combination teeth is completed.
Further, the step of acquiring the synchronization force coefficient of the synchronizer when the synchronization request of the synchronizer is received specifically includes: acquiring a synchronous ring cone angle, a synchronous ring cone surface friction coefficient, a synchronous ring cone surface number and a synchronous ring friction radius of a synchronizer; and determining a synchronous force coefficient based on a synchronous ring database, wherein the synchronous ring database comprises different synchronous ring cone angles, synchronous ring cone surface friction coefficients, synchronous ring cone surface numbers and synchronous force coefficients corresponding to the synchronous ring friction radii.
Further, in the step of obtaining the current drag torque of the transmission, the elastic force of the slider of the synchronizer, the rotational inertia of the input shaft, the rotational speed of the output shaft, and the rotational speed of the input shaft before synchronization, obtaining the current drag torque of the transmission specifically includes: acquiring the oil temperature of a transmission and the rotating speed of an input shaft; and obtaining the drag torque of the current transmission by utilizing an interpolation method based on a drag torque database, wherein the drag torque database comprises drag torque values corresponding to different transmission oil temperatures and input shaft rotating speeds.
Further, after calculating the synchronous force according to the synchronous force coefficient, the drag torque, the elastic force of the synchronizer slider, the rotational inertia of the input shaft, the rotational speed of the output shaft, and the rotational speed of the input shaft before synchronization, the method further comprises: calculating the rotating speed difference value of the rotating speed of the output shaft and the rotating speed of the input shaft before synchronization; and determining the synchronization time of the synchronizer according to the synchronization force and the rotation speed difference value.
Further, after determining the synchronization time of the synchronizer according to the synchronization force and the rotation speed difference, the method further includes: judging whether the synchronization time meets the requirement of a preset time threshold value; if the time threshold requirement is not met, correcting the synchronous force coefficient to obtain a corrected synchronous force coefficient; and if the requirement of the time threshold is met, completing the synchronization of the synchronizer and the combined teeth.
Further, judging whether the synchronization time meets a preset time threshold requirement specifically includes: if the synchronization time is less than a preset first time threshold, the requirement of the time threshold is not met; if the synchronization time is greater than a preset second time threshold, the requirement of the time threshold is not met; if the synchronization time is not less than the first time threshold and not greater than the second time threshold, the time threshold requirement is met; wherein the first time threshold is less than the second time threshold.
Further, if the time threshold requirement is not satisfied, the synchronization force coefficient is corrected to obtain a corrected synchronization force coefficient, which specifically includes: if the synchronization time is less than the first time threshold, reducing a synchronization force coefficient; and if the synchronization time is greater than the second time threshold, increasing the synchronization force coefficient.
Further, after the step of correcting the synchronous force coefficient to obtain a corrected synchronous force coefficient if the time threshold requirement is not met, the method further comprises the step of calculating the synchronous force according to the synchronous force coefficient, the drag torque, the slider elasticity of the synchronizer, the rotational inertia of the input shaft, the rotational speed of the output shaft and the rotational speed of the input shaft before synchronization, wherein the synchronous force coefficient is the corrected synchronous force coefficient.
The invention also provides an automatic transmission synchronous force self-learning closed-loop control system, which is used for realizing the automatic transmission synchronous force self-learning closed-loop control method and comprises the following steps:
the first acquisition module is used for acquiring a synchronous force coefficient of the synchronizer;
the second acquisition module is used for acquiring the current drag torque of the transmission, the elastic force of a slider of the synchronizer, the rotational inertia of the input shaft, the rotational speed of the output shaft and the rotational speed of the input shaft before synchronization;
The calculation module is used for calculating the synchronous force;
the synchronous force execution module is used for executing the synchronization of the rotating speeds of the input shaft and the output shaft;
the judging module is used for judging whether the rotating speed difference value of the input shaft and the output shaft after synchronization is smaller than a preset difference threshold value or not;
and the control module is used for controlling to return to the second acquisition module if the rotating speed difference value of the input shaft and the output shaft is not smaller than the difference threshold value after synchronization.
The invention also provides a vehicle which comprises the automatic transmission synchronous force self-learning closed-loop control system.
The implementation of the invention has the following beneficial effects:
according to the automatic transmission synchronization force self-learning closed-loop control method, the system and the vehicle, the self-learning closed-loop control is carried out according to the design parameters of the synchronizers of different gears of the transmission and the actual running conditions of the whole vehicle and the transmission, so that the calculation method of the synchronization force of the synchronizers is more accurate, the invention realizes better gear shifting performance of the transmission during gear shifting, is beneficial to reducing gear shifting noise, and improves NVH performance, thereby improving the driving performance and the comfort of the vehicle; in addition, the durability and reliability of the transmission, particularly the synchronizer, can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions and advantages of the prior art, the drawings 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 of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a method flowchart of an automatic transmission synchronization force self-learning closed-loop control method according to an embodiment of the present invention;
FIG. 2 is a schematic block diagram of an automatic transmission synchronous force self-learning closed-loop control method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the following examples. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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 invention.
Examples
Referring to fig. 1-2, the method for controlling the synchronous force self-learning closed loop of the automatic transmission of the present embodiment includes the following steps:
When a synchronizer synchronization request is received, acquiring a synchronization force coefficient of a synchronizer;
acquiring the current drag torque of the transmission, the elastic force of a slider of a synchronizer, the rotational inertia of an input shaft, the rotational speed of an output shaft and the rotational speed of the input shaft before synchronization;
calculating the synchronous force according to the synchronous force coefficient, the drag torque, the elastic force of a synchronizer sliding block, the rotational inertia of an input shaft, the rotational speed of an output shaft and the rotational speed of the input shaft before synchronization;
synchronizing the rotating speeds of the input shaft and the output shaft according to the synchronizing force, and judging whether the difference value between the rotating speed of the output shaft and the rotating speed of the synchronized input shaft is smaller than a preset difference threshold value or not;
if the difference value is not less than the difference value threshold value, returning to the step of acquiring the current drag torque of the transmission, the elastic force of a slider of the synchronizer, the rotational inertia of the input shaft, the rotational speed of the output shaft and the rotational speed of the input shaft before synchronization; and if the difference value is smaller than the difference value threshold value, the synchronization of the synchronizer and the combination teeth is completed.
In the synchronization force control method in the prior art, the synchronization force of the transmission is determined only according to a theoretical set threshold, and good closed-loop learning control is not achieved according to the transmissions with different designs and the actual operation of the whole vehicle and the transmission, so that the synchronization force control of each gear cannot be reasonably and effectively performed. In fact, different vehicle speeds and different transmission oil temperatures require different synchronizing forces to complete synchronization of the synchronizers, and the actual operation of the vehicle is particularly complicated. In this embodiment, a database is formed from drag torque test data of the clutch and the transmission oil. And extracting theoretical data corresponding to the current working condition in the actual vehicle gear shifting process, and calculating a theoretical coefficient. After synchronization is completed, actual synchronization conditions are compared, whether the step of obtaining the current drag torque, synchronizer and transmission parameters of the transmission needs to be returned or not is confirmed, and therefore better synchronous force control is achieved.
As a specific implementation manner, in the step of acquiring a synchronization force coefficient of the synchronizer when a synchronization request of the synchronizer is received, the method specifically includes: acquiring a synchronous ring cone angle, a synchronous ring cone surface friction coefficient, a synchronous ring cone surface number and a synchronous ring friction radius of a synchronizer; and determining a synchronous force coefficient based on a synchronous ring database, wherein the synchronous ring database comprises different synchronous ring cone angles, synchronous ring cone surface friction coefficients, synchronous ring cone surface numbers and synchronous force coefficients corresponding to the synchronous ring friction radii. In a transmission, the synchronizer design and performance varies from gear to gear. For a synchronizer, the most important part in the synchronization process is a synchronizing ring, and factors such as the friction material of the synchronizing ring, the cone angle of the synchronizing ring, the number of conical surfaces of the synchronizing ring, the friction radius of the synchronizing ring and the like determine the synchronization capacity. In this embodiment, different synchronizer ring cone angles, different synchronizer ring cone friction coefficients, different synchronizer ring cone numbers, and different synchronizer force coefficients corresponding to the synchronizer ring friction radii are set in advance in software to form a synchronizer ring database. When a synchronous request of a synchronizer during gear shifting is received, theoretical data are read from a synchronous ring database, and the synchronous ring database is combined with parameters such as a synchronous ring cone angle, a synchronous ring conical surface friction coefficient, the synchronous ring conical surface number and a synchronous ring friction radius of an actual synchronizer to obtain a theoretical synchronous force coefficient, so that the synchronous force of each gear can be accurately controlled during each gear shifting.
The synchronizer ring is used for synchronizing the rotating speed of the vehicle input shaft into the rotating speed of the output shaft. In addition to work by overcoming the difference in the rotational speeds of the input shaft and the output shaft, drag torque inside the transmission needs to be overcome. The drag torque within the transmission is primarily determined by the temperature of the various transmission fluids and the speed of the input shaft. In the embodiment, in the early-stage test process of the transmission, the drag torques at different oil temperatures and at different input shaft speeds are collected to form a drag torque database, and in the actual gear shifting process, an interpolation method is used for obtaining the drag torque more suitable for the transmission design and calculating the magnitude of the synchronous force. When a synchronous request of a synchronizer during gear shifting is received, the data of a vehicle, such as the oil temperature of a transmission and the rotating speed of an input shaft before synchronization, are read in real time in addition to a drag torque database serving as theoretical data. As a specific implementation manner, in the step of obtaining the current drag torque of the transmission, the elastic force of the slider of the synchronizer, the rotational inertia of the input shaft, the rotational speed of the output shaft, and the rotational speed of the input shaft before synchronization, obtaining the current drag torque of the transmission specifically includes: acquiring the oil temperature of a transmission and the rotating speed of an input shaft; and obtaining the drag torque of the current transmission by utilizing an interpolation method based on a drag torque database, wherein the drag torque database comprises drag torque values corresponding to different transmission oil temperatures and input shaft rotating speeds.
The synchronizer is mainly used for synchronizing the input shaft into the rotating speed of the output shaft in the synchronizing process. The greater the difference in rotational speed between the input shaft and the output shaft, the greater the required synchronization capability. The rotation speed of the output shaft and the rotation speed of the input shaft before synchronization are basic input conditions for calculating the synchronization force of the synchronizer. Thus, reading the vehicle data in real time also includes acquiring the output shaft speed. In addition, the synchronous force needs to overcome the elastic force of the positioning slider of the synchronizer and the moment of inertia of the input shaft, and these two factors must also be considered in the calculation of the synchronous force of the synchronizer, so the elastic force of the positioning slider of the synchronizer and the moment of inertia of the input shaft need to be acquired before the calculation of the synchronous force.
Due to the structure of the synchronizer, the rotating speed of the input shaft after synchronization cannot be guaranteed to be different from that of the output shaft. In this embodiment, the synchronized input shaft rotation speed is obtained, a difference threshold is set, and whether the current synchronizer completes synchronization is determined by judging whether the difference between the output shaft rotation speed and the synchronized input shaft rotation speed is smaller than a preset difference threshold. And if the synchronization is not finished, returning to the step of acquiring the current drag torque of the transmission, the elastic force of a slider of the synchronizer, the rotational inertia of the input shaft, the rotational speed of the output shaft and the rotational speed of the input shaft before synchronization, and carrying out secondary synchronization by combining the current rotational speeds of the input shaft and the output shaft. The self-learning closed-loop control of the synchronizer in the embodiment enables the calculation method of the synchronizing force of the synchronizer to be more accurate, achieves better gear shifting performance during gear shifting of the transmission, is beneficial to reducing gear shifting Noise, and improves NVH (Noise, Vibration and Harshness) performance, so that the driving performance and the comfort of a vehicle are improved.
As a specific implementation manner, after calculating the synchronous force according to the synchronous force coefficient, the drag torque, the elastic force of the slider of the synchronizer, the rotational inertia of the input shaft, the rotational speed of the output shaft and the rotational speed of the input shaft before synchronization, the method further comprises the following steps: calculating the rotating speed difference value between the rotating speed of the output shaft and the rotating speeds of the synchronous front and rear input shafts; and determining the synchronization time of the synchronizer according to the synchronization force and the rotation speed difference.
If the synchronization time is unreasonable, damage can be caused to a synchronizer system, particularly a synchronization ring, the mechanical property of the material is exceeded, and the service life of the synchronization ring is shortened. The synchronizing force undersize can cause the synchronizing time overlength, causes the synchronizer ring poor heat dissipation, aggravates the risk that the synchronizer ring ablated, and synchronizer ring friction material's performance can attenuate, reduces the synchronism ability of synchronous ware, seriously can cause the condition emergence that the synchronous ware was beaten the tooth, influences driver's driving impression, influences the vehicle and takes the travelling comfort. The too big synchronizing force can cause the striking too big of synchronous ware tooth cover and gear combination tooth, not only can cause very big noise, influences NVH and experiences, can cause the reduction of durability to synchronous ware tooth cover and gear moreover, reduces the durability and the reliability of derailleur. In the prior art, the calculation of the synchronization force does not take into account the tolerance of the synchronizer and other parts of the transmission, and in this embodiment, as a specific implementation manner, after determining the synchronization time of the synchronizer according to the synchronization force and the difference value of the rotation speed, the method further includes: judging whether the synchronization time meets the requirement of a preset time threshold; if the time threshold requirement is not met, correcting the synchronous force coefficient to obtain a corrected synchronous force coefficient; and if the requirement of the time threshold is met, the synchronization of the synchronizer and the combination teeth is completed.
As a specific implementation manner, determining whether the synchronization time meets a preset time threshold requirement specifically includes: if the synchronization time is less than a preset first time threshold, the requirement of the time threshold is not met; if the synchronization time is greater than a preset second time threshold, the requirement of the time threshold is not met; if the synchronization time is not less than the first time threshold and not greater than the second time threshold, the requirement of the time threshold is met; wherein the first time threshold is less than the second time threshold.
In the embodiment, in order to accurately and reasonably control the synchronous force of the synchronizer, the synchronous force is optimized and learned by correcting the synchronous force coefficient. The result based on theoretical calculation is compared with the actual performance, the synchronous force coefficient is optimized, and more reasonable synchronization can be ensured. As a specific embodiment, if the time threshold requirement is not satisfied, the step of correcting the synchronization force coefficient to obtain a corrected synchronization force coefficient includes: if the synchronization time is less than a preset first time threshold, reducing the synchronization force coefficient; and if the synchronization time is greater than a preset second time threshold, increasing the synchronization force coefficient.
In the present embodiment, the correction synchronization force coefficient is set in consideration of the deviation between the theoretical synchronization force and the actual synchronization force caused by the component tolerance of the synchronizer and the transmission. And extracting theoretical data corresponding to the current working condition in the actual vehicle gear shifting process, and calculating a theoretical synchronous force coefficient. And calculating the synchronous force and executing the synchronization of the input shaft and the output shaft according to the theoretical synchronous force coefficient, then comparing the actual synchronous conditions, and determining whether the synchronous force coefficient needs to be optimized or not so as to achieve better synchronous force control. According to the embodiment, the synchronization force coefficient is corrected by judging the actual synchronization time, so that the correction synchronization force coefficient more fitting to the batch of parts and shifting at this time is obtained by combining the theoretical synchronization force coefficient, more accurate synchronization force is obtained, more optimized shifting is performed, and the shifting quality is improved.
As a specific implementation manner, after the step of correcting the synchronous force coefficient to obtain the corrected synchronous force coefficient if the time threshold requirement is not met, the method further comprises the step of calculating the synchronous force according to the synchronous force coefficient, the drag torque, the elastic force of the synchronizer, the rotational inertia of the input shaft, the rotational speed of the output shaft and the rotational speed of the input shaft before synchronization, wherein the synchronous force coefficient is the corrected synchronous force coefficient.
According to the automatic transmission synchronization force self-learning closed-loop control method in the embodiment, self-learning closed-loop control is performed according to design parameters of synchronizers of different gears of the transmission and actual running conditions of the whole vehicle and the transmission, so that the calculation method of the synchronization force of the synchronizers is more accurate, the better gear shifting performance of the transmission during gear shifting is realized, the gear shifting noise is reduced, the NVH performance is improved, and the driving performance and the comfort of the vehicle are improved; in addition, the durability and reliability of the transmission, particularly the synchronizer, can be improved.
Another embodiment of the present invention provides an automatic transmission synchronization force self-learning closed-loop control system for implementing the automatic transmission synchronization force self-learning closed-loop control method in the above embodiments, the automatic transmission synchronization force self-learning closed-loop control system comprising: the first acquisition module is used for acquiring a synchronous force coefficient of the synchronizer; the second acquisition module is used for acquiring the current drag torque of the transmission, the elastic force of a slider of the synchronizer, the rotational inertia of the input shaft, the rotational speed of the output shaft and the rotational speed of the input shaft before synchronization; the calculation module is used for calculating the synchronous force; the synchronous force execution module is used for executing the synchronization of the input shaft and the output shaft; the judging module is used for judging whether the rotating speed difference value of the input shaft and the output shaft after synchronization is smaller than a preset difference threshold value or not; and the control module is used for controlling to return to the second acquisition module if the rotating speed difference value of the input shaft and the output shaft is not less than the difference threshold value after synchronization.
Another embodiment of the invention also provides a vehicle comprising the automatic transmission synchronous force self-learning closed-loop control system in the above embodiment.
The above embodiment of the invention has the following beneficial effects:
according to the automatic transmission synchronization force self-learning closed-loop control method, the system and the vehicle, the self-learning closed-loop control is carried out according to the design parameters of the synchronizers of different gears of the transmission and the actual running conditions of the whole vehicle and the transmission, so that the calculation method of the synchronization force of the synchronizers is more accurate, the invention realizes better gear shifting performance of the transmission during gear shifting, is beneficial to reducing gear shifting noise, and improves NVH performance, thereby improving the driving performance and the comfort of the vehicle; in addition, the durability and reliability of the transmission, particularly the synchronizer, can be improved.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A synchronous force self-learning closed-loop control method of an automatic transmission is characterized by comprising the following steps:
When a synchronizer synchronization request is received, acquiring a synchronization force coefficient of a synchronizer;
acquiring the current drag torque of the transmission, the elastic force of a slider of a synchronizer, the rotational inertia of an input shaft, the rotational speed of an output shaft and the rotational speed of the input shaft before synchronization;
calculating a synchronous force according to the synchronous force coefficient, the drag torque, the elastic force of the synchronizer sliding block, the rotational inertia of the input shaft, the rotating speed of the output shaft and the rotating speed of the input shaft before synchronization;
synchronizing the rotating speeds of the input shaft and the output shaft according to the synchronizing force, and judging whether the difference value between the rotating speed of the output shaft and the rotating speed of the synchronized input shaft is smaller than a preset difference threshold value or not;
if the difference value is not less than the difference value threshold value, returning to the step of acquiring the current drag torque of the transmission, the elastic force of a slider of the synchronizer, the rotational inertia of the input shaft, the rotational speed of the output shaft and the rotational speed of the input shaft before synchronization; and if the difference value is smaller than the difference value threshold value, the synchronization of the synchronizer and the combination teeth is completed.
2. The automatic transmission synchronous force self-learning closed-loop control method according to claim 1, wherein the step of obtaining the synchronous force coefficient of the synchronizer when the synchronizer synchronous request is received specifically comprises:
Acquiring a synchronous ring cone angle, a synchronous ring cone surface friction coefficient, a synchronous ring cone surface number and a synchronous ring friction radius of a synchronizer;
and determining a synchronous force coefficient based on a synchronous ring database, wherein the synchronous ring database comprises different synchronous ring cone angles, synchronous ring cone surface friction coefficients, synchronous ring cone surface numbers and synchronous force coefficients corresponding to the synchronous ring friction radii.
3. The automatic transmission synchronous force self-learning closed-loop control method according to claim 1, wherein in the step of obtaining the current drag torque of the transmission, the elastic force of a slider of the synchronizer, the rotational inertia of the input shaft, the rotational speed of the output shaft and the rotational speed of the input shaft before synchronization, the step of obtaining the current drag torque of the transmission specifically comprises the steps of:
acquiring the oil temperature of a transmission and the rotating speed of an input shaft;
and obtaining the drag torque of the current transmission by utilizing an interpolation method based on a drag torque database, wherein the drag torque database comprises drag torque values corresponding to different transmission oil temperatures and input shaft rotating speeds.
4. The automatic transmission synchronous force self-learning closed-loop control method according to claim 1, further comprising, after calculating a synchronous force based on the synchronous force coefficient, the drag torque, the synchronizer slider spring force, the input shaft rotational inertia, the output shaft rotational speed, and the pre-synchronization input shaft rotational speed:
Calculating the rotating speed difference value of the rotating speed of the output shaft and the rotating speed of the input shaft before synchronization;
and determining the synchronization time of the synchronizer according to the synchronization force and the rotation speed difference value.
5. The automatic transmission synchronous force self-learning closed-loop control method according to claim 4, further comprising, after determining a synchronization time of a synchronizer based on the synchronous force and the rotational speed difference value:
judging whether the synchronization time meets the requirement of a preset time threshold value;
if the time threshold requirement is not met, correcting the synchronous force coefficient to obtain a corrected synchronous force coefficient;
and if the requirement of the time threshold is met, completing the synchronization of the synchronizer and the combined teeth.
6. The automatic transmission synchronous force self-learning closed-loop control method according to claim 5, wherein judging whether the synchronous time meets a preset time threshold requirement specifically comprises:
if the synchronization time is less than a preset first time threshold, the requirement of the time threshold is not met;
if the synchronization time is greater than a preset second time threshold, the requirement of the time threshold is not met;
if the synchronization time is not less than the first time threshold and not greater than the second time threshold, the time threshold requirement is met;
Wherein the first time threshold is less than the second time threshold.
7. The automatic transmission synchronous force self-learning closed-loop control method according to claim 6, wherein if the time threshold requirement is not met, the synchronous force coefficient is corrected to obtain a corrected synchronous force coefficient, and the method specifically comprises the following steps:
if the synchronization time is less than the first time threshold, reducing a synchronization force coefficient;
and if the synchronization time is greater than the second time threshold, increasing the synchronization force coefficient.
8. The automatic transmission synchronous force self-learning closed-loop control method according to claim 5, characterized in that after the step of correcting the synchronous force coefficient if the time threshold requirement is not met, the step of calculating the synchronous force according to the synchronous force coefficient, the drag torque, the synchronizer slider elastic force, the input shaft rotational inertia, the output shaft rotational speed and the pre-synchronization input shaft rotational speed is returned to, wherein the synchronous force coefficient is the corrected synchronous force coefficient.
9. An automatic transmission synchronous force self-learning closed-loop control system for implementing the automatic transmission synchronous force self-learning closed-loop control method according to any one of claims 1 to 8, characterized by comprising:
The first acquisition module is used for acquiring a synchronous force coefficient of the synchronizer;
the second acquisition module is used for acquiring the current drag torque of the transmission, the elastic force of a slider of the synchronizer, the rotational inertia of the input shaft, the rotational speed of the output shaft and the rotational speed of the input shaft before synchronization;
the calculation module is used for calculating the synchronous force;
the synchronous force execution module is used for executing the synchronization of the rotating speeds of the input shaft and the output shaft;
the judging module is used for judging whether the rotating speed difference value of the input shaft and the output shaft after synchronization is smaller than a preset difference threshold value or not;
and the control module is used for controlling to return to the second acquisition module if the rotating speed difference value of the input shaft and the output shaft is not smaller than the difference threshold value after synchronization.
10. A vehicle comprising the automatic transmission synchronous force self-learning closed-loop control system of claim 9.
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