Anti-Interference Control Method for DCT Hydraulic Pressure Using State Observer
To improve the tracking accuracy of dual clutch automatic transmission(DCT)to the desired hydraulic pressure under various interference conditions,a sliding mode robust control method based on state observer is proposed.Firstly,the working pro-cess of DCT is divided into two stages,the air travel stage and the sliding wear stage,and the mathematical models are estab-lished respectively.Then,the uncertainty of DCT is estimated by designing an adaptive law,and the piston displacement of DCT is estimated by designing a state observer.Finally,the sliding mode robust control law in the air travel stage and the sliding wear stage is proposed to realize the accurate control of DCT hydraulic pressure.The test results show that the designed method has bet-ter performance than fuzzy PID control,and the maximum tracking error of hydraulic system is only 10kPa.Meanwhile,the de-signed adaptive law can estimate the uncertainty quickly and accurately,the maximum estimation error is only 1kPa/s,the de-signed state observer can also estimate the piston displacement accurately,and the maximum estimation error is only 0.3×10-3m,which greatly improves the control precision of DCT hydraulic system.
NETL
NSTL
万方数据
维普
