CN-116857357-B - Gear-off control method, system, equipment and medium for main box of AMT (automated mechanical transmission)

CN116857357BCN 116857357 BCN116857357 BCN 116857357BCN-116857357-B

Abstract

The invention discloses a method, a system, equipment and a medium for controlling gear shifting of a main gear of an AMT (automatic transmission), which belong to the field of AMT, and are characterized in that the method is used for determining gear shifting time of the main gear based on two factors of clutch position and engine torque, firstly correcting the friction torque of an engine, acquiring instant road curvature, road gradient and vehicle acceleration according to a gear shifting instruction sent by a TCU, and determining a gear shifting control mode of the main gear according to the acquired parameters, and combining the friction torque to acquire the gear shifting time of the main gear under the mode so as to finish the gear shifting operation of the main gear of the AMT.

Inventors

ZHANG WEILONG
LIU YI
Nie xingfu
YANG XIAOHUI
Wu Gangyuan
ZHAO XIANG

Assignees

陕西法士特齿轮有限责任公司

Dates

Publication Date: 20260512
Application Date: 20230615

Claims (8)

1. An AMT transmission main box shift-off control method, comprising: s1, correcting friction torque of an engine; s2, acquiring instant road curvature, road gradient and vehicle acceleration according to a gear shifting instruction, and acquiring a main box gear shifting moment by combining the friction torque of the S1 and a main box gear shifting control mode; s3, completing the gear shifting of the main box of the AMT transmission according to the gear shifting moment of the main box obtained in the S2; in S1, the specific step of correcting the friction torque of the engine includes: judging whether the friction torque of the engine is correct, if so, continuing to carry out the next step, otherwise, carrying out the ECU rectifying and changing of the engine until the friction torque of the engine is correct; And S2, determining a current main box gear-shifting control mode according to the obtained instant road curvature, road gradient and vehicle acceleration, wherein the main box gear-shifting control mode comprises an accelerator pedal flat road gear-shifting mode, an accelerator pedal curve or ramp gear-shifting mode, a zero accelerator flat road gear-shifting mode and a zero accelerator curve or ramp gear-shifting mode.
2. The method for controlling gear shift of main gear of an AMT transmission according to claim 1, wherein when the current gear shift control mode of the main gear is determined to be an accelerator pedal open road gear shift mode, real torque is obtained in real time, real-time net torque is obtained according to the real torque and friction torque, and when the obtained net torque at a certain moment is within a first threshold range, the moment is obtained as the gear shift moment of the main gear.
3. The method for controlling the gear shift of the main gear of the AMT transmission according to claim 1, wherein when the current gear shift control mode of the main gear is determined to be an accelerator pedal curve or a ramp gear shift mode, road resistance moment is obtained according to the curvature of a road, the gradient of the road and the acceleration of a vehicle, actual torque is obtained in real time, and when the difference between the actual torque at a certain moment and the road resistance moment is within a second threshold range, the moment is obtained as the gear shift time of the main gear.
4. The method for controlling gear shift of main gear of an AMT transmission according to claim 1, wherein when the current gear shift control mode of the main gear is determined to be a zero throttle road-flat gear shift mode, real torque is obtained in real time, real-time net torque is calculated according to the real torque and friction torque, and when the obtained net torque at a certain moment is within a third threshold range, the moment is obtained as the gear shift moment of the main gear.
5. The method for controlling the gear shift of the main box of the AMT transmission according to claim 1, wherein when the current gear shift control mode of the main box is determined to be a zero throttle curve or a ramp gear shift mode, road resistance moment is obtained according to road curvature, road gradient and vehicle acceleration, actual torque is obtained in real time, real-time net torque is obtained according to the actual torque and friction torque, and when the obtained net torque at a certain moment is equal to the road resistance moment, the moment is obtained as the gear shift time of the main box.
6. An AMT transmission main gear shift control system for implementing the steps of the AMT transmission main gear shift control method as claimed in any one of claims 1 to 5, comprising: the correction module is used for correcting the friction torque of the engine; The main box gear-shifting moment acquisition module is used for acquiring instant road curvature, road gradient and vehicle acceleration according to a gear-shifting instruction, and acquiring main box gear-shifting moment by combining friction torque and a main box gear-shifting control mode; And the gear shifting module is used for completing gear shifting of the main box of the AMT transmission according to the gear shifting moment of the main box.
7. An apparatus, comprising: A memory for storing a computer program; A processor for implementing the steps of the AMT transmission main box upshift control method as claimed in any one of claims 1 to 5 when said computer program is executed.
8. A computer readable storage medium storing a computer program, wherein the computer program is executed by a processor for implementing the steps of the AMT transmission main box off-shift control method according to any one of claims 1-5.

Description

Gear-off control method, system, equipment and medium for main box of AMT (automated mechanical transmission) Technical Field The invention belongs to the field of AMT (automated mechanical transmission), and particularly relates to a method, a system, equipment and a medium for controlling gear shifting of a main box of an AMT. Background In the process of separating the main gear of the commercial vehicle AMT by the clutch, if the TCU controls the main gear to be separated out in time, the main gear is separated out by the shifting fork, so that the problem of gear shifting and stopping of the whole vehicle is caused. In order to prevent the problem of gear shifting setbacks caused by gear shifting of a main box, the AMT of the current commercial vehicle mostly adopts a control strategy that the gear shifting of the main box is carried out after a clutch is completely separated, and the method causes long gear shifting time of the vehicle and large power loss and influences the fuel economy of the vehicle. When the main box is shifted, the TCU controls the displacement of the shifting fork shaft through the electromagnetic valve, if a large biting force exists between the sliding sleeve teeth and the gear teeth in the shifting period (the clutch is not completely separated), the main box is shifted to generate clamping stagnation, so that the shifting is not smooth, and if the TCU controls the electromagnetic valve to forcedly shift the sliding sleeve teeth from the gear teeth, the acting force between the sliding sleeve teeth and the gear teeth can cause mechanical damage to the sliding sleeve teeth and the gear teeth ends, and the whole vehicle can have the problems of pause, shake and the like. Disclosure of Invention In order to overcome the defects of the technology, the invention provides a method, a system, equipment and a medium for controlling the gear-off of a main box of an AMT (automatic transmission), which can solve the technical problems that the gear-off time of the main box is difficult to determine, the gear-off of a whole vehicle is completed when the gear-off time is unsuitable, and the gear-off is easy to be blocked and shake. In order to achieve the above purpose, the invention adopts the following technical scheme: an AMT transmission main box gear-off control method comprises the following steps: s1, correcting friction torque of an engine; s2, acquiring instant road curvature, road gradient and vehicle acceleration according to a gear shifting instruction, and acquiring a main box gear shifting moment by combining the friction torque of the S1 and a main box gear shifting control mode; s3, completing the gear shifting of the main box of the AMT transmission according to the gear shifting moment of the main box obtained in the S2; Further, in S1, the specific step of correcting the friction torque of the engine includes: and judging whether the friction torque of the engine is correct, if so, continuing to perform the next step, otherwise, performing ECU rectifying and changing on the engine until the friction torque of the engine is correct. Further, in S2, a current main box gear-shifting control mode is determined according to the obtained instant road curvature, road gradient and vehicle acceleration, wherein the main box gear-shifting control mode comprises a pedal-on-road gear-shifting mode, a pedal-on curve or ramp gear-shifting mode, a zero-pedal-on-road gear-shifting mode and a zero-pedal curve or ramp gear-shifting mode. Further, when the current main gear shifting control mode is determined to be the accelerator stepping and road shifting mode, real torque is obtained in real time, real-time net torque is obtained according to the real torque and friction torque, and when the net torque obtained at a certain moment is in a first threshold range, the moment is obtained as the main gear shifting moment. Further, when the current main gear shifting control mode is determined to be an accelerator pedal curve shifting mode or a ramp shifting mode, road resistance moment is obtained according to the curvature of a road, the gradient of the road and the acceleration of a vehicle, actual torque is obtained in real time, and when the difference value between the actual torque at a moment and the road resistance moment is in a second threshold range, the moment is obtained as the main gear shifting moment. Further, when the current main gear shifting control mode is determined to be a zero throttle road-opening shifting mode, real torque is obtained in real time, real-time net torque is calculated according to the real torque and friction torque, and when the net torque obtained at a certain moment is in a third threshold range, the moment is obtained as the main gear shifting moment. Further, when the current main box gear shifting control mode is determined to be a zero throttle curve or ramp gear shifting mode, road resistance moment is obtained according to road curvature, roa