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Active Disturbance Rejection Control for the Synchronizer Engagement with a Proportional Pressure Reducing Valve

Synchronizer as an important part of mechanical transmission, it has an important impact on gear shift performance. How to reduce shift impact and ensure shift smoothness is an important goal of synchronizer. This paper presents a novel synchronizer shift actuator controlled by proportional reducing valve, which can ensure the smoothness of shift, and the generated back pressure can effectively reduce the shift impact. In order to reduce the shift impact and complete the fast shift at the same time, the active disturbance rejection control (ADRC) method is applied, which can estimate and compensate the uncertainty of the system in real time, and improve the anti-interference ability and adaptive ability of the gear actuator. A simulation and test platform were built to verify the proposed control method. The results show that the proposed method can quickly complete the gear shift and effectively reduce the shift impact.