Mathematical modeling and performance prediction of a clutch actuator for heavy-duty automatic transmission vehicles

Ouyang, Tiancheng; Li, Shuoyu; Huang, Guicong; Zhou, Feng; Chen, Nan

doi:10.1016/j.mechmachtheory.2019.03.003

Cited by 30 publications

(9 citation statements)

References 25 publications

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“…It is assumed that the shifting proportional solenoid valve of automatic transmission used in this study has a rapid response [26,27], and there is no limit to the control variable u. According to the maximum principle, we obtain…”

Section: E Solution Of Clutch Pressure Trajectory Based On Lqrmentioning

confidence: 99%

Optimal Clutch Pressure Control in Shifting Process of Automatic Transmission for Heavy-Duty Mining Trucks

Zhang

Zhao

Sun

2020

Mathematical Problems in Engineering

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The optimal control of automatic transmission plays an important role in the shifting smoothness and fuel economy of heavy-duty mining trucks. In this paper, a dynamic model of the powertrain system is built to study the clutch pressure control during the shifting process. A linear-quadratic optimal regulator is used to achieve the optimum control pressure of clutches, where shifting jerk and clutch friction loss are chosen to a form quadratic performance index function. Besides, a detailed solution of the linear-quadratic problem with the disturbance matrix in the state equations is provided. This paper also carries out a software simulation and verification of the normal condition (no load without slope) and the extreme condition (full load with maximum slope). Compared with the preset reference trajectory control, the simulation results show that the proposed optimal clutch pressure control can effectively reduce jerk and friction loss during the shifting process and has good robustness to different operating conditions.

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Section: E Solution Of Clutch Pressure Trajectory Based On Lqrmentioning

confidence: 99%

Optimal Clutch Pressure Control in Shifting Process of Automatic Transmission for Heavy-Duty Mining Trucks

Zhang

Zhao

Sun

2020

Mathematical Problems in Engineering

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“…represents the total damping force of the spool, N. denotes the total elastic force caused by preloading, N. Since , Eq. (4) can be given by (5) Consequently, the relationship between the spool displacement and the control current of the solenoid in steady state can be determined as follows: (6) The spool displacement is related to the control current of the solenoid. The directions of the damping force during the processes of increasing and decreasing the control current are opposite, causing one control current to correspond to two different spool displacements.…”

Section: Analysis Of the Pressure Hysteresismentioning

confidence: 99%

“…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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“…A novel mathematical model of the electrohydraulic actuator is proposed to predict the response performance of a wet clutch to reduce fuel consumption and improve shift quality. 17 Since only clutch engagement speed can be measured in the real automatic clutch system, the triple-step output feedback control and the observer-based state feedback control are put forward for the clutch actuating mechanism system, respectively. [18][19][20][21][22][23] In dealing with the total disturbance of the automatic clutch system, some control methods, such as adaptive control and sliding mode control (SMC), are adopted.…”

Section: Introductionmentioning

confidence: 99%

Efficient hierarchical robust adaptive control of mode transition for parallel hybrid electric vehicles

Ding

Jiao

2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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A fast and smooth mode transition process for parallel hybrid electric vehicles (HEVs) can improve vehicle drivability. At the same time, system uncertainty resulting from friction, gearbox, parameter perturbation, production deviations, and external disturbance of the mode transition process makes control design challenges. In this regard, this paper introduces a novel efficient hierarchical robust adaptive mode transition control strategy to achieve an accurate and fast engagement of the clutch of a parallel HEV during mode transition in the case of uncertain system parameters and unmeasurable actual clutch torque in this paper. At the upper level of the controller, a robust adaptive sliding mode control (RASMC) is proposed to calculate the clutch transmitted required torque based on the current states of the electric motor (EM) and engine, and the control parameters are optimized via the particle swarm optimization (PSO) algorithm by compromising the vehicle jerk and the clutch slipping energy loss. Moreover, a fuzzy controller is designed to calculate the expected clutch engaging speed by employing the deviation of the desired and actual clutch torques, and the actual clutch torque is not a measured value but an estimate obtained by a proportional-integral (PI) observer. At the lower level, an adaptive finite-time control (AFTC) scheme is developed to overcome the gear backlash, parameter perturbation, and external disturbance during the clutch position tracking process. The effectiveness and advantage of the proposed control strategy are verified by both MATLAB/Simulink simulations and the hardware-in-loop (HIL) test.

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Mathematical modeling and performance prediction of a clutch actuator for heavy-duty automatic transmission vehicles

Cited by 30 publications

References 25 publications

Optimal Clutch Pressure Control in Shifting Process of Automatic Transmission for Heavy-Duty Mining Trucks

Optimal Clutch Pressure Control in Shifting Process of Automatic Transmission for Heavy-Duty Mining Trucks

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

Efficient hierarchical robust adaptive control of mode transition for parallel hybrid electric vehicles

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