A state observation method of electro-hydraulic control system of vehicle transmission

Abstract

The invention relates to a method for observing the state of an electro-hydraulic control system of a vehicle transmission device, belonging to the technical field of vehicle transmission electro-hydraulic control and control. The present invention aims to overcome the situation where there are hydraulic automatic transmissions and hybrid transmissions in the prior art, because the clutch oil pressure sensor is difficult to arrange on the actual vehicle, which affects the shifting quality of the vehicle, and there are many limitations in the observer based on the input and output shaft speeds problem, by building the state observation system of the electro-hydraulic control system, and collecting the input current I of the solenoid valve and the displacement x of the spool of the pressure regulating valve valve (or output oil pressure P out ) signal, according to the discretized system state equation, the unscented Kalman filter method is used to estimate the state variables such as the clutch oil pressure of the electro-hydraulic control system at the next moment, so that the real-time and accurate clutch oil pressure can be realized by using the signal that is easy to measure Estimated, and can realize the closed-loop control of the clutch oil pressure to ensure the shifting quality of the vehicle.

Description

technical field [0001] The invention belongs to the technical field of electro-hydraulic manipulation and control of vehicle transmission, and in particular relates to a state observation method of an electro-hydraulic manipulation system. Background technique [0002] Due to the structural characteristics of hydraulic automatic transmissions and hybrid power transmissions, it is difficult to arrange clutch oil pressure sensors on real vehicles. Traditional open-loop shift quality calibration methods are robust to changes in system parameters such as oil temperature, engine speed, and clutch wear. The overfilling or underfilling of the clutch in the shift preparation phase will cause the timing problem of the oil filling and oil discharge clutch overlap in the torque phase, which will affect the shifting quality of the vehicle. [0003] In recent years, many scholars have used observers based on input and output shaft speeds to estimate clutch oil pressure, but this observer...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is how to provide a method for observing the state of the electro-hydraulic control system of the vehicle transmission, so as to solve the problem that the clutch oil pressure sensor is not installed in the actual vehicle when there are hydraulic automatic transmissions and hybrid transmissions in the prior art. It is difficult to arrange and affect the quality of vehicle shifting, and there are many limitations in the observer based on the input and output shaft speed

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