A control method for compensating the loss of friction coefficient of friction plate of amt vehicle clutch
A control method and friction coefficient technology, applied in the field of automobile transmission, can solve problems such as inability to control system compensation, insufficient transmission torque, and influence on vehicle dynamic performance, so as to achieve the effect of improving real-time performance and increasing the amount of friction compensation
Active Publication Date: 2016-03-30
ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD +1
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Problems solved by technology
At this time, if the wear amount of the friction plate cannot be compensated in a timely and accurate manner, the performance of the transmission will be affected, so that it cannot truly provide the clutch control pressure, that is, the clutch control force is insufficient, resulting in insufficient transmission torque in the stages of vehicle crawling and slipping. , affect the dynamic performance of the vehicle, and even unpredictable control errors will occur in severe cases, affecting the stability of the vehicle
Existing control technologies rarely or hardly detect the loss of the friction coefficient of the friction plate, and cannot compensate the control system accordingly, thus affecting the function of the transmission
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[0026] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.
[0027] In the prior art, the initial calibration data of the control of the automatic transmission is based on the newly developed hardware foundation, but with the accumulation of running time, the friction plate of the clutch will inevitably produce friction loss, so at this time the control of the transmission to the clutch The pressure should be corrected accordingly, that is, a friction loss compensation amount needs to be added to the control target to improve the real-time performance and stability of the control system and the durability of the transmission, but the friction plate is rarely or difficult to be detected in the prior art The loss of friction coefficient cannot make corresponding compensation to the control system, thus affecting the function of the transmission. In view of this, the present invention proposes a control met...
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The invention discloses a friction coefficient loss compensation control method for a friction plate of an AMT (automated mechanical transmission) vehicle clutch. The method comprises the following steps of detecting whether the clutch is in a slip friction stage or not; if the clutch is in the slip friction stage, calculating a slip amount of the friction plate of the clutch and a slip amount threshold value, comparing the slip amount with the slip amount threshold value, and determining the compensation force of the control pressure of the clutch according to a comparison result; if the clutch is not in the slip friction stage, performing clutch pressure compensation according to a stored clutch compensation coefficient value, wherein the slip amount is a difference between the rotating speed change rate of an engine and the rotating speed change rate of the clutch; the stored clutch compensation coefficient value is a clutch compensation coefficient at the last moment. According to the method, the problem that a friction coefficient of the friction plate of the clutch is difficult to detect, and cannot be correspondingly compensated in the prior art is solved, the friction coefficient loss of the friction plate of the clutch can be accurately detected, the friction compensation can be accurately improved, and the real-time performance and the stability of a transmission control system and the durability of a transmission are effectively improved.
Description
technical field [0001] The invention belongs to the technical field of automobile transmission, relates to a clutch control method, in particular to a control method for compensating clutch friction loss. Background technique [0002] After the clutch of automatic mechanical transmission (AMT) has been used for a period of time, the friction coefficient may decrease. At this time, if the wear amount of the friction plate cannot be compensated in a timely and accurate manner, the performance of the transmission will be affected, so that it cannot truly provide the clutch control pressure, that is, the clutch control force is insufficient, resulting in insufficient transmission torque in the stages of vehicle crawling and slipping. , affect the dynamic performance of the vehicle, and even unpredictable control errors will occur in severe cases, affecting the stability of the vehicle. Existing control technologies rarely or hardly detect the loss of the friction coefficient of...
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IPC IPC(8): F16D13/75
Inventor 赵晓冬陈勇罗大国刘文忠冯擎峰
Owner ZHEJIANG GEELY AUTOMOBILE RES INST CO LTD