CN113757358A - Vehicle and gear shifting control method, device and system of double-clutch automatic gearbox of vehicle - Google Patents
Vehicle and gear shifting control method, device and system of double-clutch automatic gearbox of vehicle Download PDFInfo
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- CN113757358A CN113757358A CN202110894352.6A CN202110894352A CN113757358A CN 113757358 A CN113757358 A CN 113757358A CN 202110894352 A CN202110894352 A CN 202110894352A CN 113757358 A CN113757358 A CN 113757358A
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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
- F16H61/02—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 the signals used
- F16H61/0202—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 the signals used the signals being electric
- F16H61/0204—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 the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
- F16H61/0213—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 the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal characterised by the method for generating shift signals
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Abstract
The invention discloses a gear shifting control method of a double-clutch automatic gearbox, which is applied to an automatic control unit of the gearbox; the double-clutch automatic gearbox comprises a gear shifting assembly, the gear shifting assembly comprises a gear shifting motor, a gear shifting drum, a gear shifting fork and a synchronizer, the gear shifting motor drives the gear shifting drum through rotation, and the gear shifting fork and the synchronizer shift gears; the shift control method includes: responding to the intention of a driver, and obtaining a target gear; controlling the gear shifting motor to rotate to a target position corresponding to the target gear; determining whether the gear shifting is successful or not according to the current speed ratio of the double-clutch automatic gearbox; if the gear shifting is successful, executing gear keeping control on the gear shifting motor; if the gear shifting fails, executing gear shifting control again on the gear shifting motor; the scheme can obviously reduce the possibility of gear shifting failure and gear shifting after gear shifting of the gear shifting system.
Description
Technical Field
The application relates to the technical field of vehicles, in particular to a vehicle and a gear shifting control method, device and system of a double-clutch automatic gearbox of the vehicle.
Background
The double-clutch transmission has the characteristics of high transmission efficiency, good driving comfort without power interruption and the like, so that the double-clutch transmission is widely applied at present. The gear shift control of the double clutch needs to have rapidity and precision. At present, a mainstream gear shifting system in the market is that a hydraulic control unit drives a synchronizer to shift gears, and a gear sensor is arranged on a gearbox to judge whether gear shifting is successful or not. The gear shifting system with the gear sensor is complex in structure, high in cost and high in failure rate of a hydraulic system. Based on this, the applicant provides in the invention CN112145677A a shift drum which greatly reduces the structural complexity of the gearbox by omitting complicated mechanical structures and operation processes based on pawls and ratchet wheels. However, in practical application, the gear shifting system with the gear shifting drum structure has the possibility of gear shifting failure and gear shifting after gear shifting is successful.
Disclosure of Invention
The invention provides a vehicle and a gear shifting control method, a gear shifting control device and a gear shifting control system of a double-clutch automatic gearbox of the vehicle, and aims to solve or partially solve the technical problems of gear shifting failure and gear shifting possibility after gear shifting is successful in the existing gear shifting system with a gear shifting drum structure.
In order to solve the technical problem, according to an alternative embodiment of the present invention, a gear shifting control method for a dual clutch automatic transmission is provided, which is applied to an automatic control unit of the transmission; the double-clutch automatic gearbox comprises a gear shifting assembly, the gear shifting assembly comprises a gear shifting motor, a gear shifting drum, a gear shifting fork and a synchronizer, the gear shifting motor drives the gear shifting drum through rotation, and the gear shifting fork and the synchronizer shift gears; the shift control method includes:
responding to the intention of a driver, and obtaining a target gear;
controlling the gear shifting motor to rotate to a target position corresponding to the target gear;
determining whether the gear shifting is successful or not according to the current speed ratio of the double-clutch automatic gearbox;
if the gear shifting is successful, executing gear keeping control on the gear shifting motor;
and if the gear shifting fails, executing gear shifting control again on the gear shifting motor.
Optionally, the determining whether the gear shifting is successful according to the current speed ratio of the dual clutch automatic transmission includes:
obtaining the current speed ratio of the double-clutch automatic gearbox;
obtaining a theoretical speed ratio according to the target gear;
and determining whether the gear shifting is successful according to the current speed ratio and the theoretical speed ratio.
Further, the obtaining the current speed ratio of the dual clutch automatic transmission comprises:
obtaining the rotation speed of an input shaft of the double-clutch automatic gearbox;
obtaining the rotating speed of a driving wheel as the rotating speed of an output shaft of the double-clutch automatic gearbox;
and determining the current speed ratio according to the rotation speed of the input shaft and the rotation speed of the output shaft.
Further, the determining whether the gear shift is successful according to the current speed ratio and the theoretical speed ratio includes:
obtaining a difference between the current speed ratio and the theoretical speed ratio;
if the absolute value of the difference is larger than a threshold value, determining that the gear shifting is failed;
and if the absolute value of the difference is smaller than or equal to the threshold value, determining that the gear shifting is successful.
Optionally, the executing the gear-keeping control on the shift motor includes:
acquiring a real-time position of a gear shifting motor;
and when the deviation between the real-time position and the target position exceeds a set range, controlling the gear shifting motor to rotate to the target position.
Optionally, the executing of the re-shift control on the shift motor includes:
rotating the shift motor to a pre-shift position;
controlling the gear shifting motor to rotate to the target position;
and determining whether the gear shifting is successful according to the current speed ratio of the double-clutch automatic gearbox.
Optionally, after the number of times of executing the re-shift control on the shift motor reaches a preset number of times, the shift control method further includes:
and if the gear shifting fails, generating gear shifting failure fault information.
According to still another alternative embodiment of the present invention, there is provided a shift control device for a dual clutch automatic transmission, applied to a transmission automatic control unit; the double-clutch automatic gearbox comprises a gear shifting assembly, the gear shifting assembly comprises a gear shifting motor, a gear shifting drum, a gear shifting fork and a synchronizer, the gear shifting motor drives the gear shifting drum through rotation, and the gear shifting fork and the synchronizer shift gears; the shift control device includes:
the gear shifting module is used for controlling the gear shifting motor to rotate to a target position corresponding to the target gear; if the gear shifting fails, executing gear shifting control again on the gear shifting motor;
the gear shifting checking module is used for determining whether gear shifting is successful or not according to the current speed ratio of the double-clutch automatic gearbox;
and the gear keeping module is used for executing gear keeping control on the gear shifting motor if the gear shifting is successful.
According to still another alternative embodiment of the invention, a gear shifting system of a dual clutch automatic transmission is provided, the gear shifting system comprises a transmission automatic control unit and a gear shifting assembly, the gear shifting assembly comprises a gear shifting motor, a gear shifting drum, a gear shifting fork and a synchronizer, the gear shifting motor drives the gear shifting drum through rotation, and the gear shifting fork and the synchronizer shift gears; the processor of the transmission automatic control unit is programmed to:
responding to the intention of a driver, and obtaining a target gear;
controlling the gear shifting motor to rotate to a target position corresponding to the target gear;
determining whether the gear shifting is successful or not according to the current speed ratio of the double-clutch automatic gearbox;
if the gear shifting is successful, executing gear keeping control on the gear shifting motor;
and if the gear shifting fails, executing gear shifting control again on the gear shifting motor.
According to still another alternative embodiment of the present invention, there is provided a vehicle including the shift system in the foregoing technical solution.
Through one or more technical schemes of the invention, the invention has the following beneficial effects or advantages:
the invention provides a gear shifting control method of a double-clutch automatic gearbox, which introduces a gear shifting verification function for solving the possible gear shifting failure problem; after the primary gear shifting action, gear verification is carried out according to the current speed ratio of the double-clutch automatic gearbox, and whether gear shifting is successful is judged; the current actual gear is verified by adopting the current speed ratio of the gearbox, and a gear sensor commonly used by the existing gear shifting system can be omitted, so that the cost is reduced; if the gear checking result is that gear shifting is successful, in order to solve the possible gear-shifting problem, gear-shifting maintaining control is introduced, so that the gear-shifting drum can be fixed at a target gear and does not rotate under vibration impact, and the position of the gear-shifting drum is ensured to be correct and does not shift; if the gear checking result is that gear shifting fails, introducing gear shifting control again, and enabling the gear shifting drum to rotate to a correct target gear through gear shifting again; generally speaking, according to the scheme, through the gear shifting verification after gear shifting, gear shifting is kept after the gear shifting is successful, and gear shifting is carried out again after the gear shifting is failed, so that the gear shifting failure and the possibility of gear shifting out after the gear shifting are obviously reduced while the accurate gear shifting and the efficient gear shifting of the gear shifting system of the gear shifting drum structure are ensured.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 shows a schematic representation of a shifting system according to the invention;
FIG. 2 shows a flow diagram of a shift control method according to an embodiment of the present invention;
FIG. 3 illustrates a detailed logic decision diagram of a shift control method according to one embodiment of the present invention;
fig. 4 shows a schematic diagram of a gear change control device according to another embodiment of the invention.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments. Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control. Unless otherwise specifically stated, various apparatuses and the like used in the present invention are either commercially available or can be prepared by existing methods.
As in the prior patents: CN112145677A and fig. 1 show that the gear shifting system based on the solution of the present invention includes: a gear-shifting (driving) motor 1, a speed reducing mechanism 2, a gear-shifting drum 3, a gear-shifting fork 4 and a synchronizer 5. The gear shifting motor 1 is a power source of a gear shifting system and is provided with a position angle sensor; the speed reducing mechanism 2 is arranged between the gear shifting motor 1 and the gear shifting drum 3, the driving motor 1 drives the speed reducing mechanism 2 to rotate, and a gear of the speed reducing mechanism 2 drives the gear shifting drum 3 to rotate; 4 grooves in preset shapes are designed on the outer circumferential surface of the gear shifting drum 3, a gear shifting fork 4 is matched with each groove, and each gear shifting fork 4 corresponds to one synchronizer 5; therefore, the shift fork 4 in the groove is driven by the rotation of the shift drum 3 to move axially, and the shift fork 4 moves axially to drive the synchronizer 5 to perform corresponding shifting. By correspondingly designing the shape of the groove of the shift drum 3, corresponding actions of different gear synchronizers can be realized. The angle of the shift drum 1 theoretically corresponds to the gear.
Research on the gear shifting system with the structure shows that the gear shifting failure of the gear shifting system is caused by the following reasons: the gear shifting system is characterized in that a gear shifting motor 1 is adopted to drive a gear shifting drum 3 to rotate, the gear shifting drum 3 is rotated to drive a gear shifting fork 4 to move so as to realize gear shifting of a synchronizer 5, an angle sensor is designed on the gear shifting motor 1, the angle of the gear shifting drum 3 corresponds to the position of the gear shifting fork 4 through transmission of a fixed speed ratio, and the position of the gear shifting fork corresponds to a gear. Theoretically the shift motor 1 angle corresponds to the gearbox gear, but from the shift motor 1 to the synchronizer 5 the gear sleeve, a total of 4 gears are passed. In the extreme case of transmission backlash and rigid deformation, the shift motor has moved to the target angular position, and the sleeve gear of the synchronizer may not have moved to the target position, resulting in a shift failure. Unlike the gear shifting system with a gear sensor in the prior art, the gear shifting system of the present invention does not have a gear sensor, and cannot judge whether the gear shifting is successful. If the gear shifting motor is turned to the target corner position, the gear shifting is judged to be successful, and actually, the gear shifting is not successful due to system clearance and rigid deformation. Under the condition of such misjudgment, the gearbox continues to transmit torque, and damages and faults of the gearbox, such as synchronous ring ablation or synchronizer gear beating, can be caused. The reason why the gear-shifting system is out of gear after gear shifting is as follows: after the gear shifting is successful, the whole vehicle vibrates, such as the vibration and the impact of a transmission system, and the working conditions of vehicle turning, vehicle braking and the like can cause gear shifting, and because the gear shifting drum can rotate under the vibration and impact condition, the gear sleeve of the synchronizer can move to be separated from the current target gear.
Therefore, in order to solve the problems of gear shift failure and gear shift out after gear shift success of a gear shift system with a gear shift drum structure, the invention provides a gear shift control method of a double-clutch automatic gearbox, which is applied to an automatic control unit of the gearbox; the double-clutch automatic gearbox comprises a gear shifting assembly, the gear shifting assembly comprises a gear shifting motor, a gear shifting drum, a gear shifting fork and a synchronizer, the gear shifting motor drives the gear shifting drum through rotation, and the gear shifting fork and the synchronizer shift gears; the shift control method includes: responding to the intention of a driver, and obtaining a target gear; controlling the gear shifting motor to rotate to a target position corresponding to the target gear; determining whether the gear shifting is successful or not according to the current speed ratio of the double-clutch automatic gearbox; if the gear shifting is successful, executing gear keeping control on the gear shifting motor; and if the gear shifting fails, executing gear shifting control again on the gear shifting motor.
The principle of the gear shifting control method for solving the problems is as follows: for solving the problem of possible gear shifting failure, a gear shifting verification function is introduced; after the primary gear shifting action, gear verification is carried out according to the current speed ratio of the double-clutch automatic gearbox, and whether gear shifting is successful is judged; the current actual gear is verified by adopting the current speed ratio of the gearbox, and a gear sensor commonly used by the existing gear shifting system can be omitted, so that the cost is reduced; if the gear checking result is that gear shifting is successful, in order to solve the possible gear-shifting problem, gear-shifting maintaining control is introduced, so that the gear-shifting drum can be fixed at a target gear and does not rotate under vibration impact, and the position of the gear-shifting drum is ensured to be correct and does not shift; if the gear checking result is that gear shifting fails, introducing gear shifting control again, and enabling the gear shifting drum to rotate to a correct target gear through gear shifting again; generally speaking, according to the scheme, through the gear shifting verification after gear shifting, gear shifting is kept after the gear shifting is successful, and gear shifting is carried out again after the gear shifting is failed, so that the gear shifting failure and the possibility of gear shifting out after the gear shifting are obviously reduced while the accurate gear shifting and the efficient gear shifting of the gear shifting system of the gear shifting drum structure are ensured.
In the following, the above scheme is further explained with reference to the specific implementation contents:
in an alternative embodiment, the above-described aspect is applied to an automatic transmission control unit having a shifting system of the structure of fig. 1, the shifting control method including:
s1: the target gear is achieved in response to the driver's intent.
Specifically, the driver intention is a driving intention of the driver, for example, a degree of stepping on an accelerator pedal, and a Transmission Control Unit (TCU) can determine whether a gear shift is required next according to a working condition of the entire vehicle (such as a current vehicle speed, a throttle opening degree, and the like) and the driver intention, and calculate a target gear if the gear shift is required.
S2: and controlling the gear shifting motor to rotate to a target position corresponding to the target gear.
Secondly, the TCU determines a target angle position of the gear shifting motor according to the target gear, and sends the target angle position to the gear shifting motor to enable the gear shifting motor to rotate towards the target angle position; the gear shifting motor rotates to drive the speed reducing mechanism to rotate; the speed reducing mechanism rotates to drive the gear shifting drum to rotate; the gear shifting drum rotates to drive the gear shifting fork to axially move; the shifting fork moves to drive the synchronizer gear sleeve to move and shift gears.
S3: and determining whether the gear shifting is successful according to the current speed ratio of the double-clutch automatic gearbox.
In the above steps, since the shifting action is from the shift motor to the synchronizer sleeve, passing through 4 transmission mechanisms, in the limit situation of transmission system clearance and rigid deformation, the shift motor may be rotated to the target angle position, and the synchronizer sleeve may not be moved to the target gear position, so that it is started to verify whether the shifting is successful. Since the gear shifting system of the embodiment omits a gear sensor, the current actual gear cannot be directly obtained from the gear sensor, and therefore whether gear shifting is successful or not cannot be judged. Therefore, in the embodiment, a set of gear checking calculation method is adopted to accurately judge whether the current gear is engaged in place, which is specifically as follows:
obtaining the current speed ratio of the double-clutch automatic gearbox; obtaining a theoretical speed ratio according to the target gear; and determining whether the gear shifting is successful according to the current speed ratio and the theoretical speed ratio.
The current speed ratio of the current transmission line can be determined according to the rotation speed of the input shaft and the rotation speed of the output shaft, and can also be called as a calculated speed ratio, and the specific steps are as follows:
GC＝NIS/NOS；
in the above formula, GCIs the current (calculated) speed ratio;
NISthe speed of an input shaft of the gearbox is calculated;
NOSwhich is the transmission output shaft speed.
Input shaft speed N of gearboxISProvided by a transmission input shaft speed sensor, and the transmission output shaft speed N in this embodimentOSBy using the wheel speed to participate in the calculation with reference to the wheel speed, the output shaft speed sensor can be omitted, thereby further simplifying the structure and reducing the cost.
The theoretical ratio is the transmission ratio for which the current target gear theoretically corresponds. The theoretical speed ratio may be determined by: and obtaining a theoretical speed ratio corresponding to the target gear according to the target gear and a preset gear-theoretical speed ratio mapping relation. The gear-theoretical ratio map has the form shown in table 1:
table 1: example of a mapping relationship between gears and theoretical speed ratios
| |
1 | 2 | 3 | 4 | 5 | 6 | 7 | …… | R |
| Theoretical speed ratio | G1 | G2 | G3 | G4 | G5 | G6 | G7 | GR |
Next, by comparing the difference between the current/calculated speed ratio and the theoretical speed ratio, it can be judged whether the shift was successful:
for example, a ratio between the current speed ratio and the theoretical speed ratio may be calculated, and if the ratio is greater than a first ratio threshold or less than a second ratio threshold, a shift failure may be determined, otherwise a shift success may be determined. Optionally, the first proportional threshold may be 1.03 to 1.1, preferably 1.05; the second proportional threshold may be 0.9 to 0.98, preferably 0.95, of the theoretical speed ratio.
For another example, a difference between the current speed ratio and the theoretical speed ratio may be calculated, and if the absolute value of the difference is greater than the difference threshold, it is determined that the shift has failed, otherwise it is determined that the shift has succeeded. Alternatively, the difference threshold may be 3% to 10%, preferably 5%, of the theoretical speed ratio.
Take 5% as an example, if the current speed ratio GcIf the difference value between the theoretical speed ratio G and the current speed ratio is within +/-5% of the theoretical speed ratio, the current speed ratio is considered to be consistent with the theoretical speed ratio, and the successful gear shifting is confirmed; if the difference exceeds +/-5% of the theoretical speed ratio, the current speed ratio and the theoretical speed ratio are consideredAnd if the gear shift is inconsistent, confirming the failure of gear shift.
S41: and if the gear shifting is successful, executing gear keeping control on the gear shifting motor.
After the gear shifting is successful, the gear shifting motor is switched to a target position corresponding to a target gear and is required to be kept at the target position currently, so that the gear is kept unchanged under external interference, such as vibration of a transmission system, turning and braking conditions, and therefore gear keeping control is required after the gear shifting is successful, namely the angle position of the gear shifting motor is kept at the target position corresponding to the current target gear.
The conventional gear keeping scheme is that after gear shifting is finished, a preset current is continuously applied to a gear shifting motor, so that the gear shifting motor generates a torque, and the torque is used for resisting vibration impact and avoiding rotation of a gear shifting drum. However, the value of the preset current is not easy to be accurately determined, because if the current is too small, the current cannot play a role in resisting vibration, and if the current is too large, the current is easy to drive the gear shifting drum to rotate under the action of external force, so that gear shifting is caused.
Further research shows that after gear shifting is completed, if no current is applied to the gear shifting motor, namely the current is 0, the gear shifting motor is a three-phase direct current motor, friction torque and tooth space torque exist, and the two torques are synthesized into resistance torque of the gear shifting motor which is about 0.2 Nm. The speed ratio of the gear shifting speed reducing mechanism is about 60, and the resisting moment of the gear shifting motor acting on the gear shifting drum is about 12 Nm. 12Nm can ensure that the shift drum keeps the position unchanged under most impact conditions, and the shift drum is fixed at the target position and does not rotate. Based on this, the present embodiment adopts another control scheme:
acquiring a real-time position of a gear shifting motor; and when the deviation between the real-time position and the target position exceeds a set range, controlling the gear shifting motor to rotate to the target position.
The control principle of the scheme is as follows: for some small external vibration interferences, the position of a gear shifting drum can be ensured to be unchanged by utilizing the 0.2Nm resisting moment of the gear shifting motor; if the external vibration interference overcomes the resistance torque provided by the gear shifting motor, so that the position of the gear shifting drum is moved, the rotation of the gear shifting drum can be reacted to the gear shifting motor through the speed reducing mechanism, and the gear shifting motor is rotated; and the gear shifting motor is provided with an angle position sensor, so that the position change of the gear shifting motor can be monitored in real time. Therefore, by acquiring the real-time angle position of the gear shifting motor, if the situation that the gear shifting motor is driven to rotate beyond the set range due to the rotation of the gear shifting drum is detected, if the designed angle tolerance range is detected, or the gear shifting motor rotates beyond the designed angle range, it is shown that the gear shifting drum can possibly cause gear shifting, the TCU controls the gear shifting motor to rotate to the target angle position corresponding to the target gear again, so that the gear shifting drum is driven to return to the target position without gear shifting, the purpose of gear keeping is achieved, and the gear shifting hidden danger after the gear shifting is successful is eliminated. Alternatively, the set range may be ± 1.7 °.
S42: and if the gear shifting fails, executing gear shifting control again on the gear shifting motor.
If the gear shifting fails, the gear shifting control is executed again, and the following scheme can be adopted:
rotating the shift motor to a pre-shift position; controlling the gear shifting motor to rotate to the target position; and determining whether the gear shifting is successful according to the current speed ratio of the double-clutch automatic gearbox.
Specifically, if the gear shift fails, the gear shift motor needs to be rotated again, and the specific steps are as follows: and opening the double clutches, controlling the gear shifting motor to rotate to the previous position, namely the position before gear shifting or the previous gear, and then rotating to the target position of the target gear. The step of the re-shift control may be repeated a certain number of times in succession, such as 3 to 5 times, preferably 3 times. If the gear shifting motor continuously rotates for 3 times and is not consistent through the gear verification of the step S3, namely the gear shifting fails, the gear shifting is stopped at the moment, and a gear shifting failure fault is reported.
A flow diagram of a shift control method incorporating all of the steps described above is shown in fig. 3.
In summary, the present embodiment provides a gear shift control method, which has the following advantages:
(1) the gear shifting motor is provided with a position angle sensor, a theoretical gear refers to a gear shifting angle, gear verification is carried out after the gear shifting motor rotates to a target position, and whether the gear shifting is successful or not is confirmed. The gear shifting control adopts closed-loop control, and the control accuracy is high;
(2) verifying the current real gear by adopting a speed ratio algorithm; the rotating speed signals of the speed ratio calculation are the rotating speed and the wheel speed of the input shaft of the gearbox respectively, so that the rotating speed sensor of the output shaft of the gearbox can be omitted, and the gearbox has the characteristic of simple structure;
(3) whether the gear shifting is successful or not is judged by comparing the theoretical speed ratio with the current real speed ratio and setting a comparison threshold value of +/-5% to confirm whether the target gear is successfully engaged; the gear is verified through the speed ratio, so that the gear sensor can be omitted from the gear shifting control system, and the gear shifting system has the characteristics of simplicity, reliability and low cost;
(4) after the gear shifting failure is judged by the gear shifting verification, the gear shifting is carried out again for preset times, if the gear shifting is carried out for 3 times, if the gear shifting is not successful for 3 times continuously, the failure fault of the gear shifting is reported, so that the system fault caused by the fact that the gear shifting system enters the cycle gear shifting is avoided;
(5) after the gear shifting is judged to be successful through the gear shifting check, a gear keeping control method is added, the resisting moment of a gear shifting motor is about 0.2Nm under the normal condition, and a gear shifting drum can be fixed at a target position and does not rotate; the target angle control of the gear shifting motor is designed under the limit condition, so that the position of the gear shifting drum is ensured to be correct, and gear shifting does not occur.
Generally speaking, the gear shifting system adopts the motor to drive the gear shifting, and has the characteristics of simple structure, high transmission efficiency and quick control response. And the gear verification and the gear maintaining control are carried out in the gear shifting process, so that the vehicle can be ensured to run at the correct gear.
According to the same inventive concept as the previous embodiment, in another alternative embodiment, there is provided a shift control device of a dual clutch automatic transmission, applied to a transmission automatic control unit; the double-clutch automatic gearbox comprises a gear shifting assembly, the gear shifting assembly comprises a gear shifting motor, a gear shifting drum, a gear shifting fork and a synchronizer, the gear shifting motor drives the gear shifting drum through rotation, and the gear shifting fork and the synchronizer shift gears; as shown in fig. 4, the shift control device includes:
the gear shifting module 10 is used for controlling the gear shifting motor to rotate to a target position corresponding to the target gear; if the gear shifting fails, executing gear shifting control again on the gear shifting motor;
the gear shifting checking module 20 is used for determining whether gear shifting is successful according to the current speed ratio of the dual-clutch automatic gearbox;
and the gear maintaining module 30 is used for executing gear maintaining control on the gear shifting motor if the gear shifting is successful.
Optionally, the shift checking module 20 is configured to:
obtaining the current speed ratio of the double-clutch automatic gearbox;
obtaining a theoretical speed ratio according to the target gear;
and determining whether the gear shifting is successful according to the current speed ratio and the theoretical speed ratio.
Further, the shift checking module 20 is configured to:
obtaining the rotation speed of an input shaft of the double-clutch automatic gearbox;
obtaining the rotating speed of a driving wheel as the rotating speed of an output shaft of the double-clutch automatic gearbox;
and determining the current speed ratio according to the rotation speed of the input shaft and the rotation speed of the output shaft.
Further, the shift checking module 20 is configured to:
obtaining a difference between the current speed ratio and the theoretical speed ratio;
if the absolute value of the difference is larger than a threshold value, determining that the gear shifting is failed;
and if the absolute value of the difference is smaller than or equal to the threshold value, determining that the gear shifting is successful.
Optionally, the gear maintaining module 30 is configured to:
acquiring a real-time position of a gear shifting motor;
and when the deviation between the real-time position and the target position exceeds a set range, controlling the gear shifting motor to rotate to the target position.
Optionally, the shift module 10 is configured to:
rotating the shift motor to a pre-shift position;
controlling the gear shifting motor to rotate to the target position;
and determining whether the gear shifting is successful according to the current speed ratio of the double-clutch automatic gearbox.
Optionally, the shift module 10 is configured to:
and after the frequency of executing the secondary gear shifting control on the gear shifting motor reaches a preset frequency, if the gear shifting fails, generating gear shifting failure fault information.
Based on the same inventive concept of the previous embodiment, in yet another alternative embodiment, a gear shifting system of a dual clutch automatic transmission is provided, the gear shifting system includes a transmission automatic control unit and a gear shifting assembly, the gear shifting assembly includes a gear shifting motor, a gear shifting drum, a gear shifting fork and a synchronizer, the gear shifting motor drives the gear shifting drum through rotation, and the gear shifting fork and the synchronizer shift gears; the processor of the transmission automatic control unit is programmed to:
responding to the intention of a driver, and obtaining a target gear;
controlling the gear shifting motor to rotate to a target position corresponding to the target gear;
determining whether the gear shifting is successful or not according to the current speed ratio of the double-clutch automatic gearbox;
if the gear shifting is successful, executing gear keeping control on the gear shifting motor;
and if the gear shifting fails, executing gear shifting control again on the gear shifting motor.
Based on the same inventive concept of the foregoing embodiment, in yet another alternative embodiment, a vehicle is provided that includes the gear shift system according to the foregoing embodiment.
Through one or more embodiments of the present invention, the present invention has the following advantageous effects or advantages:
the invention provides a gear shifting control method, a gear shifting control device and a gear shifting system of a double-clutch automatic gearbox, aiming at solving the problem of gear shifting failure possibly, a gear shifting verification function is introduced; after the primary gear shifting action, gear verification is carried out according to the current speed ratio of the double-clutch automatic gearbox, and whether gear shifting is successful is judged; the current actual gear is verified by adopting the current speed ratio of the gearbox, and a gear sensor commonly used by the existing gear shifting system can be omitted, so that the cost is reduced; if the gear checking result is that gear shifting is successful, in order to solve the possible gear-shifting problem, gear-shifting maintaining control is introduced, so that the gear-shifting drum can be fixed at a target gear and does not rotate under vibration impact, and the position of the gear-shifting drum is ensured to be correct and does not shift; if the gear checking result is that gear shifting fails, introducing gear shifting control again, and enabling the gear shifting drum to rotate to a correct target gear through gear shifting again; generally speaking, according to the scheme, through the gear shifting verification after gear shifting, gear shifting is kept after the gear shifting is successful, and gear shifting is carried out again after the gear shifting is failed, so that the gear shifting failure and the possibility of gear shifting out after the gear shifting are obviously reduced while the accurate gear shifting and the efficient gear shifting of the gear shifting system of the gear shifting drum structure are ensured.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A gear shifting control method of a double-clutch automatic gearbox is characterized by being applied to an automatic control unit of the gearbox; the double-clutch automatic gearbox comprises a gear shifting assembly, the gear shifting assembly comprises a gear shifting motor, a gear shifting drum, a gear shifting fork and a synchronizer, the gear shifting motor drives the gear shifting drum through rotation, and the gear shifting fork and the synchronizer shift gears; the shift control method includes:
responding to the intention of a driver, and obtaining a target gear;
controlling the gear shifting motor to rotate to a target position corresponding to the target gear;
determining whether the gear shifting is successful or not according to the current speed ratio of the double-clutch automatic gearbox;
if the gear shifting is successful, executing gear keeping control on the gear shifting motor;
and if the gear shifting fails, executing gear shifting control again on the gear shifting motor.
2. The shift control method according to claim 1, wherein the determining whether the shift is successful based on the current speed ratio of the dual clutch automatic transmission includes:
obtaining the current speed ratio of the double-clutch automatic gearbox;
obtaining a theoretical speed ratio according to the target gear;
and determining whether the gear shifting is successful according to the current speed ratio and the theoretical speed ratio.
3. The shift control method according to claim 2, wherein said obtaining the current speed ratio of the dual clutch automatic transmission includes:
obtaining the rotation speed of an input shaft of the double-clutch automatic gearbox;
obtaining the rotating speed of a driving wheel as the rotating speed of an output shaft of the double-clutch automatic gearbox;
and determining the current speed ratio according to the rotation speed of the input shaft and the rotation speed of the output shaft.
4. The shift control method of claim 2, wherein said determining whether the shift is successful based on the current speed ratio and the theoretical speed ratio comprises:
obtaining a difference between the current speed ratio and the theoretical speed ratio;
if the absolute value of the difference is larger than a threshold value, determining that the gear shifting is failed;
and if the absolute value of the difference is smaller than or equal to the threshold value, determining that the gear shifting is successful.
5. The shift control method according to claim 1, wherein the executing of the shift-position maintaining control over the shift motor includes:
acquiring a real-time position of a gear shifting motor;
and when the deviation between the real-time position and the target position exceeds a set range, controlling the gear shifting motor to rotate to the target position.
6. The shift control method according to claim 1, wherein the executing of the re-shift control over the shift motor includes:
rotating the shift motor to a pre-shift position;
controlling the gear shifting motor to rotate to the target position;
and determining whether the gear shifting is successful according to the current speed ratio of the double-clutch automatic gearbox.
7. The shift control method according to claim 1, characterized in that after the number of times the re-shift control is executed over the shift motor reaches a preset number of times, the shift control method further comprises:
and if the gear shifting fails, generating gear shifting failure fault information.
8. A gear shift control device of a double-clutch automatic gearbox is characterized by being applied to an automatic control unit of the gearbox; the double-clutch automatic gearbox comprises a gear shifting assembly, the gear shifting assembly comprises a gear shifting motor, a gear shifting drum, a gear shifting fork and a synchronizer, the gear shifting motor drives the gear shifting drum through rotation, and the gear shifting fork and the synchronizer shift gears; the shift control device includes:
the gear shifting module is used for controlling the gear shifting motor to rotate to a target position corresponding to the target gear; if the gear shifting fails, executing gear shifting control again on the gear shifting motor;
the gear shifting checking module is used for determining whether gear shifting is successful or not according to the current speed ratio of the double-clutch automatic gearbox;
and the gear keeping module is used for executing gear keeping control on the gear shifting motor if the gear shifting is successful.
9. The gear shifting system of the double-clutch automatic gearbox is characterized by comprising a gearbox automatic control unit and a gear shifting assembly, wherein the gear shifting assembly comprises a gear shifting motor, a gear shifting drum, a gear shifting fork and a synchronizer; the processor of the transmission automatic control unit is programmed to:
responding to the intention of a driver, and obtaining a target gear;
controlling the gear shifting motor to rotate to a target position corresponding to the target gear;
determining whether the gear shifting is successful or not according to the current speed ratio of the double-clutch automatic gearbox;
if the gear shifting is successful, executing gear keeping control on the gear shifting motor;
and if the gear shifting fails, executing gear shifting control again on the gear shifting motor.
10. A vehicle characterized in that the vehicle comprises a gear shift system according to claim 9.
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