Model Design for a Hydraulic Clutch Actuation System

Mesmer, Felix; Kiltz, Lothar; Graichen, Knut

doi:10.1016/j.ifacol.2018.03.012

Cited by 4 publications

(1 citation statement)

References 15 publications

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“…Present studies on wet clutches mainly focus on the nonlinear characteristics and model building of hydraulic system [3][4][5][6]. Most of these studies conduct mathematical analysis on spool dynamics by considering the nonlinearities in hydraulic system, thereby resulting in complexities and remarkable nonlinearities in the established models.…”

Section: Introductionmentioning

confidence: 99%

Pressure Control Method of an Electro-hydraulic Actuated Clutch Considering Hysteresis

Zhou¹,

Xue²,

Xiao³

2019

JESTR

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The nonlinear hysteretic characteristics of a wet clutch's pressure control valve in dual clutch transmission (DCT) can cause pressure response delay, which affects pressure control accuracy. This study proposed a compound control method for hysteresis compensation based on the analysis of the nonlinear hysteretic characteristics of the electrohydraulic pressure control valve to reveal the influence mechanism of hysteresis on the wet clutch and to improve pressure control accuracy. The compound control method included a feed-forward controller and an additional feedback controller. The pressure hysteresis of the electrohydraulic pressure control valve was analyzed through mathematical modeling of the valve spool. Two experiments were designed to verify and characterize the pressure hysteresis. The feed-forward control algorithm for hysteresis compensation combined with the proportional-integral-derivative (PID) controller was formulated to realize pressure control based on the characteristics of the wet clutch's pressure hysteresis. The feasibility and effectiveness of the proposed control method were verified through bench tests. Results show that the average absolute error in steady state reduces from 0.186 bar to 0.005 bar under the proposed control method. The average relative error decreases from 2.924% to 0.092% compared with the system without any pressure control. In addition, the use of the proposed control method in dynamic working condition reduces the average absolute error from 0.189 bar to 0.043 bar and decreases the average relative error from 2.963% to 0.722% compared with the system without any pressure control. The proposed control method under the state with step pressure input can guarantee the system response speed and control accuracy. Finally, the comparison of compound control, feed-forward control, and PID control shows that the compound control method can achieve optimum performance in pressure tracking regardless of the test conditions. This study provides an easy-to-implement and high-precision method for pressure control of automotive wet clutches.

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Section: Introductionmentioning

confidence: 99%