Torque capacity estimation method and system

Abstract

The invention discloses a torque capacity estimation method. The torque capacity estimation method comprises the steps that whether a target clutch is in a sliding abrasion state or not is detected; if yes, the current working point of the target clutch is obtained; and a torque capacity estimation value corresponding to the current working point is searched in overall and local hysteresis estimation models generated by adopting a preset generation method. According to the method, the torque capacity estimation value corresponding to the current working point is estimated according to the overall hysteresis estimation model and the local hysteresis estimation model, the overall hysteresis and the local hysteresis are estimated through the estimation models respectively, and the situation that a large difference exists between a complete separation curve and a complete joint curve in the torque capacity direction is avoided; and meanwhile, when the separation / joint direction is changed,a local hysteresis loop can be formed by taking a separation bearing displacement / execution motor corner as a working point of a vertical / horizontal coordinate, and modeling is carried out only through full separation and complete combination with a median line of a curve, so that the precision of torque capacity estimated by an overall hysteresis loop model is low.

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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