CN111828626B - Automatic transmission parking control method and system matched with electronic gear shifter and vehicle - Google Patents
Automatic transmission parking control method and system matched with electronic gear shifter and vehicle Download PDFInfo
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- CN111828626B CN111828626B CN202010713632.8A CN202010713632A CN111828626B CN 111828626 B CN111828626 B CN 111828626B CN 202010713632 A CN202010713632 A CN 202010713632A CN 111828626 B CN111828626 B CN 111828626B
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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
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
- F16H63/34—Locking or disabling mechanisms
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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
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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
Abstract
The invention discloses an automatic transmission parking control method and system matched with an electronic gear shifter and a vehicle. The automatic transmission parking control method of the matched electronic gear shifter comprises the following steps: the electronic gear shifter control unit detects a torque release identifier of the transmission control unit; if the torque release identifier indicates that the torque is not released, the electronic gear shifter control unit detects the gradient of the vehicle; if the gradient of the vehicle indicates that the vehicle is in a slope parking working condition, the electronic gear shifter control unit detects a vehicle parking mark of the vehicle body stabilizing system; if the vehicle parking mark represents electronic parking enabling, the electronic gear shifter control unit controls the transmission gear actuator to rotate to the N gear and continues for a first preset time; and the electronic gear shifter control unit controls the transmission gear actuator to shift to the P gear, so that parking is completed. The invention can solve the P-gear impact problem of the transmission on the basis of meeting the requirement of parking the vehicle on the ramp, improve the parking safety of the whole vehicle and improve the comfort level of the whole vehicle.
Description
Technical Field
The embodiment of the invention relates to the technical field of vehicles, in particular to an automatic transmission parking control method and system matched with an electronic gear shifter and a vehicle.
Background
When a transmission of a vehicle is in a D gear or an R gear, a driver steps on a brake pedal, a P gear is engaged for parking, engine torque is transmitted to a main speed reducer from the transmission to wheels, and a part of torque is stored in the transmission system due to the deformation of the transmission system. In this case, entering transmission P-range park after an Electronic Park (EPB) enable may result in the torque stored in the vehicle driveline not being released. When the transmission exits the P gear, due to the fact that torque in a transmission system is released rapidly, impact is generated between a transmission parking ratchet wheel and a parking actuating mechanism pawl, and the problem of P gear impact of the transmission is caused.
In the existing parking control method, in order to solve the problem of impact when the P gear is engaged, torque is released before the P gear is engaged. When a driver engages the gear P from the gear D or the gear R, certain delay is carried out on the execution process according to the mode of judging the release state position of the transmission torque, and whether the torque is completely released or not is determined by judging the action time of the torque release and the rotating speed of a turbine of the transmission. However, the impact problem of the prior art on the ramp parking cannot be improved, the ramp parking has a slope risk, potential safety hazards exist, and the driving experience is influenced.
Disclosure of Invention
The embodiment of the invention provides an automatic transmission parking control method and system matched with an electronic gear shifter and a vehicle, and aims to solve the problem of P-gear impact of a transmission on the basis of meeting the requirement of parking the vehicle in a ramp, improve the parking safety of the whole vehicle and improve the comfort of the whole vehicle.
In a first aspect, an embodiment of the present invention provides an automatic transmission parking control method for a matched electronic shifter, including:
the electronic gear shifter control unit detects a torque release identifier of the transmission control unit;
if the torque release identifier indicates that torque is not released, the electronic gear shifter control unit detects the gradient of the vehicle;
if the gradient of the vehicle indicates that the vehicle is in a slope parking working condition, the electronic gear shifter control unit detects a vehicle parking mark of a vehicle body stabilizing system;
if the vehicle parking mark represents electronic parking enabling, the electronic gear shifter control unit controls the transmission gear actuator to shift to N gear and continues for a first preset time;
and the electronic gear shifter control unit controls the transmission gear actuator to shift to a P gear, so that parking is completed.
Optionally, after the electronic shifter control unit detects a torque release flag of the transmission control unit, the method further comprises:
and if the torque release identifier indicates that the torque is released, the electronic gear shifter control unit controls the transmission gear actuator to shift to the P gear, and parking is finished.
Optionally, after the electronic shifter control unit detects a gradient of the vehicle, the method further comprises:
if the gradient of the vehicle indicates that the vehicle is not in the hill-hold working condition, the electronic gear shifter control unit controls the gear actuator of the transmission to rotate to the N gear and continues for a first preset time; and the electronic gear shifter control unit controls the transmission gear actuator to shift to a P gear, so that parking is completed.
Optionally, after the electronic shifter control unit detects a vehicle parking flag of a vehicle body stabilization system, the method further includes:
and if the vehicle parking mark indicates that electronic parking is not enabled, the vehicle body stabilizing system performs electronic parking braking, and the vehicle parking mark is set as electronic parking enabled.
Optionally, the obtaining of the torque release indicator indicative of a torque release comprises the following torque release conditions:
a gear shifting handle of the transmission is in a D gear position or an R gear position;
the actual gear of the transmission is in 1 gear or R gear;
the oil temperature of the transmission is in a first preset interval;
the position of an accelerator pedal is smaller than an accelerator opening threshold value;
the vehicle speed is less than a vehicle speed threshold;
the engine speed is less than the engine speed threshold;
the pressure of the vehicle brake master cylinder is greater than the pressure threshold value of the brake master cylinder;
the current gradient of the vehicle is in a first ramp range;
and, the engine start stop function is not activated.
Optionally, the obtaining of the torque release indicator representing a torque release further comprises: the torque release condition is satisfied and the duration is greater than a second preset time.
Optionally, the gear position of the transmission is fed back to the electronic shifter control unit via a gear position angle sensor.
Optionally, the gradient of the vehicle is indicative of the vehicle being in a hill hold condition, comprising:
if the gradient of the vehicle is larger than a first gradient threshold value, the vehicle is in an uphill parking working condition;
and if the gradient of the vehicle is smaller than a second gradient threshold value, the vehicle is in a downhill parking working condition.
In a second aspect, an embodiment of the present invention provides an automatic transmission parking control system for a matched electronic shifter, including:
the automatic transmission comprises an electronic gear shifter control unit, a transmission control unit, a vehicle body stabilizing system and a transmission gear actuator; the electronic gear shifting control unit comprises a torque release identification acquisition module, a vehicle gradient acquisition module, a vehicle parking identification acquisition module, an N gear conversion module and a P gear conversion module;
the torque release identifier acquisition module is used for detecting a torque release identifier of the transmission control unit;
the gradient obtaining module of the vehicle is used for detecting the gradient of the vehicle sent by the electronic gear shifter control unit if the torque release identifier indicates that the torque is not released;
the vehicle parking mark acquisition module is used for detecting a vehicle parking mark of the vehicle body stabilization system if the gradient of the vehicle indicates that the vehicle is in a ramp parking working condition;
the N-gear conversion module is used for controlling the transmission gear actuator to rotate to N gear and last for a first preset time if the vehicle parking mark represents electronic parking enabling;
and the P gear conversion module is used for controlling the transmission gear actuator to rotate to a P gear to complete parking.
In a third aspect, an embodiment of the present invention provides a vehicle, including: the embodiment of the invention provides an automatic transmission parking control system matched with an electronic gear shifter.
In the embodiment of the invention, when the electronic shifter control unit detects that the vehicle is in the hill-hold working condition, after the vehicle-hold mark of the vehicle body stabilizing system indicates the electronic parking enable, the transmission gear actuator is controlled to rotate to the N gear, so that the vehicle body stabilizing system can brake the vehicle body under the hill-hold working condition, and the vehicle can be prevented from sliding down the hill during the hill-hold process. The transmission gear actuator is controlled to rotate to the N gear, the first preset time is continued, the torque stored in a vehicle transmission system is released when the transmission is located in the N gear, and then the transmission gear actuator is controlled to enter the P gear parking, so that the problem of P gear impact of the transmission is solved. Therefore, compared with the prior art, the embodiment of the invention can solve the P-gear impact problem of the transmission on the basis of meeting the requirement of parking the vehicle on the ramp, improve the parking safety of the whole vehicle and improve the comfort of the whole vehicle.
Drawings
FIG. 1 is a schematic structural diagram of an automatic transmission parking control system provided by an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a method of matching an electronic shifter for automatic transmission park control provided by an embodiment of the present invention;
FIG. 3 is a flow chart illustrating another method of matching electronic shifter park control for an automatic transmission provided by an embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating the setting of a torque release flag according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an automatic transmission parking control system matched with an electronic shifter according to an embodiment of the invention;
fig. 6 is a schematic structural diagram of a vehicle according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment of the invention provides an automatic transmission parking control method matched with an electronic gear shifter, which can be realized based on an automatic transmission parking control system matched with the electronic gear shifter and is applicable to the situation that a vehicle parks on a slope. Fig. 1 is a schematic structural diagram of an automatic transmission parking control system according to an embodiment of the present invention, and fig. 2 is a schematic flow chart of an automatic transmission parking control method according to an embodiment of the present invention. As shown in fig. 1 and 2, the automatic transmission parking control method of the matching electronic shifter includes the steps of:
s110, the electronic gear shifter control unit detects a torque release identifier of the transmission control unit.
Among them, an Electronic Gear Sequence Manager (EGSM) 410 is used to control a Gear shift Sequence according to positions of the P, R, N, and D gears fed back by a Gear position and rotation angle sensor 450, and is executed by a transmission Gear actuator 440. A Transmission Control Unit (TCU) 420 is used to determine whether to transmit the torque of the engine, and transmits a torque release flag to the electronic shifter Control Unit 410 when the vehicle is shifted from D range or R range to P range. The torque release flag may be set to TcuTorqRlsFlag, for example, and when TcuTorqRlsFlag is 1, it indicates that the torque is released; when TcuTorqRlsFlag is 0, it indicates that torque is not released. If the pawl of the transmission gear actuator 440 is directly engaged into the P-gear parking ratchet wheel under the condition that the torque is not released, in the process of realizing the transmission parking P-gear control, the torque stored in the transmission system is not released in time to cause the problem of impact, so that the problem of impact when the transmission goes out of the P-gear again is caused, and the torque needs to be released in the subsequent steps.
And S120, if the torque release identifier shows that the torque is not released, the electronic gear shifter control unit detects the gradient of the vehicle.
When the vehicle needs to be parked on a slope, the torque stored in the transmission system is directly released through the N gear of the transmission, the vehicle slipping risk exists, the slope of the vehicle needs to be detected, and whether the vehicle is in the slope parking working condition or not can be confirmed through detecting the slope of the vehicle.
S130, if the gradient of the vehicle indicates that the vehicle is in the hill-hold working condition, the electronic gear shifter control unit detects a vehicle parking mark of the vehicle body stabilizing system.
Among them, an Electronic Stability Program (ESP) 430 is used to analyze vehicle driving state information and help the vehicle maintain dynamic balance. The vehicle body stabilizing system 430 comprises an electronic parking EPB function, when the vehicle is parked on a ramp when the vehicle is parked in a D gear or an R gear, the electronic parking EPB function of the vehicle body stabilizing system ESP430 is automatically activated, a vehicle parking mark is set to be 1, and the vehicle parking mark can be set to be EsppreKeOnFlag; when the EPB is not activated, the vehicle parking flag EspBrekeOnFlag is 0.
And S140, if the vehicle parking mark indicates that the electronic parking is enabled, the electronic gear shifter control unit controls the transmission gear actuator to rotate to the N gear and continues for a first preset time.
After the electronic gear shifter control unit 410 controls the transmission gear actuator 440 to shift to the N gear, the N gear timing is started, the torque stored in the vehicle transmission system is released through the N gear control, the first preset time is the time (namely the time for completing the torque release) staying in the N gear in the process of shifting from the D gear or the R gear into the P gear, and the time can be calibrated according to the requirements in the real vehicle environment. Optionally, the first preset time range may be 0.1-1 s. Preferably, the first preset time may be different in the case of parking in different gears in P, for example, 0.4s in the case of D-gear in P-gear and 0.6s in the case of R-gear in P-gear.
And S150, controlling the transmission gear actuator to shift to the P gear by the electronic gear shifter control unit to complete parking.
The parking mechanism of the automatic transmission comprises a P-gear parking actuating mechanism and a transmission parking ratchet wheel. When the gear shifts to the P gear, the electronic gear shifter control unit 410 controls the automatic transmission parking mechanism matched with the electronic gear shifter to control the transmission gear actuator 440 to enable a parking mechanism pawl to be clamped into a transmission parking ratchet wheel tooth, so that the transmission parking control process is achieved, and the P gear parking function of the vehicle is achieved.
According to the parking control method of the automatic transmission matched with the electronic gear shifter, provided by the embodiment of the invention, when the electronic gear shifter control unit detects that the vehicle is in the hill-hold working condition, after the vehicle parking mark of the vehicle body stabilizing system indicates the electronic parking enable, the gear actuator of the transmission is controlled to rotate to the N gear, the vehicle body stabilizing system is ensured to brake the vehicle body under the hill-hold working condition, and the vehicle is prevented from sliding down the slope during the hill-hold working condition. The transmission gear actuator is controlled to rotate to the N gear, the first preset time is continued, the torque stored in a vehicle transmission system is released when the transmission is located in the N gear, and then the transmission gear actuator is controlled to enter the P gear parking, so that the problem of P gear impact of the transmission is solved. Therefore, compared with the prior art, the embodiment of the invention can solve the P-gear impact problem of the transmission on the basis of meeting the requirement of parking the vehicle on the ramp, improve the parking safety of the whole vehicle and improve the comfort of the whole vehicle.
Fig. 3 is a flow chart of another method for controlling parking of an automatic transmission matching an electronic shifter according to an embodiment of the present invention. As shown in fig. 3, in addition to the above embodiment, the method for controlling parking of an automatic transmission of a matching electronic shifter includes the steps of:
s210, judging whether the torque release mark indicates that the torque is released, if so, executing S270, and if not, executing S220.
And S220, judging whether the vehicle is in a hill-hold working condition, if so, executing S230, and otherwise, executing S240.
Further, the indication of the grade of the vehicle that the vehicle is in the hill hold condition includes: if the gradient of the vehicle is greater than the first gradient threshold value, the vehicle is in an uphill parking working condition; and if the gradient of the vehicle is smaller than the second gradient threshold value, the vehicle is in a downhill parking working condition. The first gradient threshold value may be set to iSlopHigh, and the second gradient threshold value may be set to iSlopLow.
The vehicle gradient feeds back the ramp information of the current vehicle parking time, and the gradient value is a positive value and represents the vehicle uphill state; the slope value is a negative value, indicating a downhill state of the vehicle. Alternatively, the first slope threshold may be 10% and the second slope threshold may be-10%.
And S230, judging whether the vehicle parking mark indicates electronic parking enabling, if so, executing S240, and otherwise, executing S280.
The electronic parking EPB function of the vehicle body stabilizing system ESP is automatically activated when the vehicle is detected to be parked on an upslope or a downslope currently when the vehicle is parked in a D gear or an R gear, the electronic parking EPB function of the vehicle body stabilizing system ESP is electronically parked, and the vehicle parking mark is set to be electronically parked and enabled. And under the condition that the EPB is not activated, setting the vehicle parking mark to be not enabled. Alternatively, the electronic parking enable may be represented as 1, and the electronic parking not enable may be represented as 0.
And S240, controlling the transmission gear actuator to shift to the N gear by the electronic gear shifter control unit.
Further, the gear position of the transmission is fed back to the electronic gear shifter control unit through a gear position and angle sensor.
S250, determining whether the execution time of the N-stage is greater than a first preset time, if so, executing S260, otherwise, executing S240.
And S260, the electronic gear shifter control unit controls the transmission gear actuator to shift from the N gear to the P gear.
And S270, controlling the transmission gear actuator to shift to the P gear by the electronic gear shifter control unit.
The transmission control unit TCU first checks the transmission torque release condition, and controls the clutch to reduce the transmission of the engine torque and release the stored torque in the drive train after the transmission torque release condition is met. After the torque is released, the transmission torque release identification set torque is released and transmitted to the electronic gear shifter control unit, in the vehicle parking P gear execution process, the electronic gear shifter control unit directly controls the transmission gear actuator to enter the P gear position from the D gear position or the R gear position, the engagement of a pawl for parking the transmission and a parking ratchet wheel of the transmission is realized, and the parking control of the automatic transmission is completed. Alternatively, a torque release flag of 1 indicates that the TCU has implemented the transfer torque release control process, and a torque release flag of 0 indicates that the TCU has not implemented the transfer torque release control process.
And S280, the vehicle body stabilizing system performs electronic parking braking, and the vehicle parking mark is set as electronic parking enabling.
And S290, completing parking.
According to the automatic transmission parking control method matched with the electronic gear shifter, when a parking request of a driver is executed, a P-gear parking process of the transmission is realized through coordination of the electronic gear shifter control unit, the transmission control unit TCU and the vehicle body stabilizing system ESP. The electronic gear shifter control unit is combined with a torque release identifier of a transmission control unit TCU, and under the condition that the TCU is detected to release the torque, the transmission gear actuator is directly driven to enter a P gear from a D gear or an R gear, so that the parking process is realized. The problem that the vehicle is slowly responded and impacted when entering the parking P gear from the D gear or the R gear and exiting the P gear is solved. In the case that the transmission control unit TCU does not release torque, after the electronic shifter control unit recognizes the electronic parking enable of the ESP if the vehicle is parked on a hill, the transmission enters P range after releasing the torque stored in the transmission system through N range of the transmission. The vehicle is prevented from slipping down the slope when the N gear of the transmission is executed during the hill-holding process of the vehicle. Under the non-ramp parking working condition, the electronic gear shifter control unit directly controls the transmission to enter the N gear, releases the torque and finally completes parking control. Therefore, the embodiment of the invention can meet the parking requirement of the vehicle under all working conditions, effectively solves the problems of noise and impact during the process of parking the transmission out of the P gear, improves the gear shifting quality of a transmission system, and simultaneously improves the safety during the parking process of the vehicle.
Fig. 4 is a schematic flow chart of setting a torque release flag according to an embodiment of the present invention. On the basis of the above-described embodiment, the transmission control unit TCU first performs the transmission torque release condition check after receiving the driver parking request. With reference to fig. 4, the embodiment of the present invention further explains a determination process for setting the torque release flag. Fig. 4 in the present application is only an example of the determination order, and the number of the determination conditions and the determination order may be adjusted as needed in actual application.
Referring to FIG. 4, when the TCU torque release condition is met, the TCU performs a torque release and marks the torque release as torque released. When either torque release condition is not met, the TCU sets the torque release flag to torque not released. The method comprises the following specific steps:
and S310, judging whether a gear shifting handle of the transmission is in a D gear position or an R gear position, if so, executing S320, and otherwise, executing S3C 0.
And S320, judging whether the actual gear of the transmission is in the 1 gear or the R gear, if so, executing S330, and otherwise, executing S3C 0.
S330, judging whether the oil temperature of the transmission is in a first preset interval, if so, executing S340, and otherwise, executing S3C 0.
For example, the first preset interval of the transmission oil temperature may be 10 ℃ to 170 ℃.
And S340, judging whether the position of an accelerator pedal is smaller than an accelerator opening threshold, if so, executing S350, and otherwise, executing S3C 0.
For example, the accelerator opening threshold may be 3%.
And S350, judging whether the vehicle speed is less than a vehicle speed threshold value, if so, executing S360, and otherwise, executing S3C 0.
For example, the vehicle speed threshold may be set to 0.1 km/h.
And S360, judging whether the engine speed is less than the engine speed threshold value, if so, executing S370, and otherwise, executing S3C 0.
For example, the engine speed threshold may be set at 1500 rpm.
And S370, judging whether the pressure of the vehicle brake master cylinder is greater than the pressure threshold value of the brake master cylinder, if so, executing S380, and otherwise, executing S3C 0.
For example, the master cylinder pressure threshold may be set at 12 Bar.
And S380, judging whether the current gradient of the vehicle is in the first ramp range, if so, executing S390, and otherwise, executing S3C 0.
Alternatively, the first ramp may range from-10% to 10%.
And S390, judging whether the engine start-stop function is activated, if so, executing S3C0, and otherwise, executing S3A 0.
And S3A0, judging whether the torque release duration is greater than a second preset time, if so, executing S3B0, and otherwise, executing S3C 0.
Alternatively, the second preset time may be 2 s.
S3B0, torque release mark set torque released.
S3C0, torque release flag set torque not released.
And S3D0, and outputting a torque release identification.
Through the steps, the embodiment of the invention can accurately judge the setting condition of the torque release identifier.
The embodiment of the invention also provides an automatic transmission parking control system matched with the electronic gear shifter, which can be used for realizing the automatic transmission parking control method matched with the electronic gear shifter provided by each embodiment and has corresponding beneficial effects.
Fig. 5 is a schematic structural diagram of an automatic transmission parking control system matched with an electronic shifter according to an embodiment of the invention. As shown in fig. 5, the automatic transmission parking control system of the matching electronic shifter includes: an electronic shifter control unit 410, a transmission control unit 420, a body stabilization system 430, and a transmission gear actuator 440; the electronic shift control unit 410 includes a torque release flag acquisition module 411, a vehicle gradient acquisition module 412, a vehicle park flag acquisition module 413, an N-range conversion module 414, and a P-range conversion module 415.
The torque release flag acquiring module 411 is configured to detect a torque release flag of the transmission control unit; the vehicle gradient acquisition module 412 is configured to detect a gradient of the vehicle sent by the electronic shifter control unit if the torque release flag indicates that the torque is not released; the vehicle parking identifier obtaining module 413 is configured to detect a vehicle parking identifier of the vehicle body stabilization system if the gradient of the vehicle indicates that the vehicle is in a hill-hold working condition; the N-gear conversion module 414 is configured to control the transmission gear actuator to shift to the N gear for a first preset time if the vehicle parking flag indicates that the electronic parking is enabled; the P-range conversion module 415 is configured to control the transmission gear actuator to shift to the P-range, thereby completing the parking.
Further, the acquisition of the torque release flag indicating the release of the torque includes the following torque release conditions: a gear shifting handle of the transmission is in a D gear position or an R gear position; the actual gear of the transmission is in 1 gear or R gear; the oil temperature of the transmission is in a first preset interval; the position of an accelerator pedal is smaller than an accelerator opening threshold value; the vehicle speed is less than a vehicle speed threshold; the engine speed is less than the engine speed threshold; the pressure of the vehicle brake master cylinder is greater than the pressure threshold value of the brake master cylinder; the current gradient of the vehicle is in a first ramp range; and, the engine start stop function is not activated.
Further, the obtaining of the torque release flag indicating the torque release further includes: the torque release condition is satisfied and the duration is greater than a second preset time.
Further, the indication of the grade of the vehicle that the vehicle is in the hill hold condition includes: if the gradient of the vehicle is greater than the first gradient threshold value, the vehicle is in an uphill parking working condition; and if the gradient of the vehicle is smaller than the second gradient threshold value, the vehicle is in a downhill parking working condition.
On the basis of the above embodiment, optionally, the P-range conversion module 415 is further configured to, after the electronic shifter control unit 410 detects the torque release flag of the transmission control unit 420, control the transmission gear actuator 440 to shift to the P-range and complete parking if the torque release flag indicates that torque is released.
On the basis of the above embodiment, the N-gear conversion module 414 is further configured to, after the electronic shifter control unit 410 detects the gradient of the vehicle, if the gradient of the vehicle indicates that the vehicle is not in the hill-hold condition, control the transmission gear actuator 440 to shift to the N-gear for a first preset time;
the P-range shift module 415 controls the transmission range actuator 440 to shift to P-range, completing park.
On the basis of the above embodiment, the vehicle body stabilization system 430 is further configured to, after the electronic shifter control unit detects the vehicle parking flag of the vehicle body stabilization system, perform the electronic parking brake if the vehicle parking flag indicates that the electronic parking is not enabled, and set the vehicle parking flag to be the electronic parking enabled.
With continued reference to fig. 5, based on the above embodiment, the automatic transmission parking control system of the matched electronic shifter further includes: a gear position and rotation angle sensor 450 and a transmission 460.
The gear position of the transmission is fed back to the electronic shifter control unit 410 via the gear position angle sensor 450.
The electronic gear shifter control unit 410 is connected to the transmission control unit 420, the body stabilization system 430, the transmission gear actuator 440 and the gear position and rotation angle sensor 450, respectively, the transmission 460 is connected to the transmission control unit 420, the transmission gear actuator 440 and the gear position and rotation angle sensor 450, and the transmission gear actuator 440 is also connected to the gear position and rotation angle sensor 450. The electronic gear shifter control unit 410 is communicatively connected to the transmission control unit 420 and the body stabilization system 430 via a CAN bus.
The embodiment of the invention also provides a vehicle, which can realize the parking control method of the automatic transmission matched with the electronic gear shifter provided by the embodiments, and has corresponding beneficial effects.
Fig. 6 is a schematic structural diagram of a vehicle according to an embodiment of the present invention. As shown in fig. 6, the vehicle 500 includes: an automatic transmission park control system 510 that matches an electronic shifter is provided in any embodiment of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (7)
1. An automatic transmission parking control method matched with an electronic shifter is characterized by comprising the following steps:
the electronic gear shifter control unit detects a torque release identifier of the transmission control unit;
if the torque release identifier indicates that torque is not released, the electronic gear shifter control unit detects the gradient of the vehicle;
if the gradient of the vehicle indicates that the vehicle is in a slope parking working condition, the electronic gear shifter control unit detects a vehicle parking mark of a vehicle body stabilizing system;
if the vehicle parking mark represents electronic parking enabling, the electronic gear shifter control unit controls the transmission gear actuator to shift to N gear and continues for a first preset time;
the electronic gear shifter control unit controls the transmission gear actuator to rotate to a P gear, and parking is completed;
after the electronic shifter control unit detects a torque release indicator of a transmission control unit, further comprising:
if the torque release identifier indicates that the torque is released, the electronic gear shifter control unit controls the transmission gear actuator to shift to a P gear to complete parking;
the transmission control unit firstly checks a transmission torque release condition, controls the clutch to reduce the transmission of the engine torque and releases the stored torque in the transmission system after the transmission torque release condition is met;
the acquisition of the torque release indicator representing a torque release includes the following torque release conditions:
a gear shifting handle of the transmission is in a D gear position or an R gear position;
the actual gear of the transmission is in 1 gear or R gear;
the oil temperature of the transmission is in a first preset interval;
the position of an accelerator pedal is smaller than an accelerator opening threshold value;
the vehicle speed is less than a vehicle speed threshold;
the engine speed is less than the engine speed threshold;
the pressure of the vehicle brake master cylinder is greater than the pressure threshold value of the brake master cylinder;
the current gradient of the vehicle is in a first ramp range;
and, the engine start stop function is not activated;
the obtaining of the torque release indicator indicative of a torque release further comprises: the torque release condition is satisfied and the duration is greater than a second preset time.
2. The method of matching an electronic shifter parking control of an automatic transmission of claim 1, further comprising, after the electronic shifter control unit detecting a grade of a vehicle:
if the gradient of the vehicle indicates that the vehicle is not in the hill-hold working condition, the electronic gear shifter control unit controls the gear actuator of the transmission to rotate to the N gear and continues for a first preset time; and the electronic gear shifter control unit controls the transmission gear actuator to shift to a P gear, so that parking is completed.
3. The method for controlling parking of an automatic transmission matching an electronic shifter according to claim 1, further comprising, after the electronic shifter control unit detects a vehicle parking flag of a vehicle body stabilization system:
and if the vehicle parking mark indicates that electronic parking is not enabled, the vehicle body stabilizing system performs electronic parking braking, and the vehicle parking mark is set as electronic parking enabled.
4. The method of claim 1, wherein the gear position of the transmission is fed back to the electronic shifter control unit via a gear position angle sensor.
5. The method of claim 1, wherein the slope of the vehicle indicating that the vehicle is in hill hold comprises:
if the gradient of the vehicle is larger than a first gradient threshold value, the vehicle is in an uphill parking working condition;
and if the gradient of the vehicle is smaller than a second gradient threshold value, the vehicle is in a downhill parking working condition.
6. An automatic transmission parking control system that matches an electronic shifter, comprising: the automatic transmission comprises an electronic gear shifter control unit, a transmission control unit, a vehicle body stabilizing system and a transmission gear actuator; the electronic gear shifting control unit comprises a torque release identification acquisition module, a vehicle gradient acquisition module, a vehicle parking identification acquisition module, an N gear conversion module and a P gear conversion module;
the torque release identifier acquisition module is used for detecting a torque release identifier of the transmission control unit;
the gradient obtaining module of the vehicle is used for detecting the gradient of the vehicle sent by the electronic gear shifter control unit if the torque release identifier indicates that the torque is not released;
the vehicle parking mark acquisition module is used for detecting a vehicle parking mark of the vehicle body stabilization system if the gradient of the vehicle indicates that the vehicle is in a ramp parking working condition;
the N-gear conversion module is used for controlling the transmission gear actuator to rotate to N gear and last for a first preset time if the vehicle parking mark represents electronic parking enabling;
the P gear conversion module is used for controlling the transmission gear actuator to rotate to a P gear to complete parking;
the P gear conversion module is also used for controlling the transmission gear actuator to shift to a P gear to complete parking if the torque release identifier indicates that the torque is released after the electronic gear shifter control unit detects the torque release identifier of the transmission control unit;
the transmission control unit firstly checks a transmission torque release condition, controls the clutch to reduce the transmission of the engine torque and releases the stored torque in the transmission system after the transmission torque release condition is met;
the acquisition of the torque release indicator representing a torque release includes the following torque release conditions:
a gear shifting handle of the transmission is in a D gear position or an R gear position;
the actual gear of the transmission is in 1 gear or R gear;
the oil temperature of the transmission is in a first preset interval;
the position of an accelerator pedal is smaller than an accelerator opening threshold value;
the vehicle speed is less than a vehicle speed threshold;
the engine speed is less than the engine speed threshold;
the pressure of the vehicle brake master cylinder is greater than the pressure threshold value of the brake master cylinder;
the current gradient of the vehicle is in a first ramp range;
and, the engine start stop function is not activated;
the obtaining of the torque release indicator indicative of a torque release further comprises: the torque release condition is satisfied and the duration is greater than a second preset time.
7. A vehicle characterized in that it comprises an automatic transmission parking control system of a matched electronic shifter as claimed in claim 6.
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| CN202010713632.8A CN111828626B (en) | 2020-07-22 | 2020-07-22 | Automatic transmission parking control method and system matched with electronic gear shifter and vehicle |
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| CN202010713632.8A CN111828626B (en) | 2020-07-22 | 2020-07-22 | Automatic transmission parking control method and system matched with electronic gear shifter and vehicle |
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| CN113483094A (en) * | 2021-06-18 | 2021-10-08 | 重庆长安汽车股份有限公司 | Automatic transmission gear control method and system and vehicle |
| CN115289216A (en) * | 2022-07-26 | 2022-11-04 | 中汽创智科技有限公司 | Control method and control system for improving climbing capability of stepless automatic gearbox |
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| CN111828626A (en) | 2020-10-27 |
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