Method and system for estimating torque capacity

Abstract

The invention discloses a method for estimating torque capacity, which includes: detecting whether the target clutch is in a slipping state; if so, obtaining the current working point of the target clutch; Find the estimated value of torque capacity corresponding to the current operating point in the estimation model; the above-mentioned method estimates the estimated value of torque capacity corresponding to the current operating point according to the overall and local hysteresis estimation models, and the above-mentioned estimation The model estimates the overall and local hysteresis separately, avoiding the large gap between the complete disengagement and complete engagement curves in the direction of torque capacity, and at the same time when changing the disengagement / engagement direction, the disengagement bearing displacement / execution motor The rotation angle as the operating point of the ordinate / abscissa will form a local hysteresis, which is only modeled through the median line of the full separation and full integration curves, resulting in the low accuracy of the torque capacity estimated by the overall hysteresis model.

Description

technical field [0001] The invention relates to the technical field of automobile transmission system control, in particular to a method and system for estimating torque capacity. Background technique [0002] In new energy vehicles, one of the prerequisites for precise control of the clutch torque capacity is to realize real-time estimation of the torque capacity. The executive motor converts the rotational motion of the motor rotor into the linear motion of the release bearing through the reduction mechanism. For some As far as the actuator is concerned, there is a significant overall hysteresis between the two release bearing displacement / executing motor rotation angle relationship curves corresponding to the process of separating and engaging the clutch. Adaptation of the overall hysteresis model, [0003] The inventor conducted research on the overall hysteresis model and found that there is a large gap between the complete disengagement curve and the complete engageme...

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Problems solved by technology

[0004] In view of this, the present invention provides a method and system for estimating torque capacity, which is used to solve the large gap between the completely disengaged and fully engaged curves in the direction of torque capacity in the prior art, and at the same time, when changing the disengagement / disengagement In the engagement direction, the operating point with the disengagement bearing displacement / executing motor rotation angle as the ordinate / abscissa will form a local hysteresis loop, which will be modeled only through the median line of the full separation and full integration curves, resulting in the rotation speed estimated by the overall hysteresis model. The problem of low accuracy of moment capacity

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