Fuzzy-Type Fast Terminal Sliding-Mode Controller for Pressure Control of Pilot Solenoid Valve in Automatic Transmission

Yongyi He,Minglun Fang,Xiangwen Fan,Pengfei Cheng

doi:10.1109/access.2019.2937847

Yongyi He, Minglun Fang + Show 2 more

Open Access

https://doi.org/10.1109/access.2019.2937847

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Journal: IEEE Access	Publication Date: Jan 1, 2019
Citations: 5	License type: CC BY 4.0

Affiliation: Shanghai University

Abstract

The performance of the pilot solenoid valve (PSV) has a significant impact on the efficiency and service life of an automatic transmission (AT) in automobiles, and it is very difficult to achieve a perfect pressure tracking performance due to the sophisticated combination of mechanical, hydraulic and electromagnetic characteristics inside the PSV. In this paper, based on a nominal nonlinear dynamic model of the PSV including uncertainties and an external disturbance, a fast terminal sliding-mode control (FTSMC) method is developed to achieve tracking precision and robustness in the pressure control of the PSV. To alleviate the chattering phenomenon in the control input signal, fuzzy logic rules are established to tune the switching control coefficient of the control law in FTSMC controller. Compared with the trend-law-based sliding-mode control (TLSMC) method and PID method, the developed fuzzy-type fast terminal sliding-mode control (F-FTSMC) method achieves the shortest settling time, the smallest tracking error at steady state and almost no chattering in the control input by intelligently changing the control law. Simulations and experiments are demonstrated to verify the effectiveness and excellent advantages of the proposed controller.

Highlights

An automatic transmission (AT) is widely adopted in automobiles because of its superiority in continuous power shifting and self-adjustment capability [1]
F-fast terminal sliding-mode control (FTSMC) CONTROLLER a diagram of the proposed fuzzy-type fast terminal slidingmode control (F-FTSMC) controller for pressure control of the pilot solenoid valve (PSV) is established and shown in Fig. 3 As stated above, fuzzy logic rules are used to tune the switching control coefficient μN in the FTSMC controller according to the value of s, and the control input u of the PSV is given by the FTSMC controller
In this paper, to improve the pressure tracking performance of the PSV used in the ATs of automobiles, an F-FTSMC controller is proposed to accelerate the convergence speed and eliminate the chattering of the terminal sliding-mode control (TSMC) controller

Summary

INTRODUCTION

An automatic transmission (AT) is widely adopted in automobiles because of its superiority in continuous power shifting and self-adjustment capability [1]. Pressure control of the PSV is complicated because its dynamic characteristic arises from three different systems: the mechanical system of the spool and spring, the electromagnetic system of the solenoid and the hydraulic system of the fluid [2]. Few studies have focused on an output control method for a solenoid valve based on a detailed nonlinear dynamic model. Due to its intrinsic robustness to uncertainties and external disturbances, the variable structure with sliding-mode control (SMC) has gradually become one of the important control methods for very complex nonlinear systems. A fuzzy-type fast terminal sliding-mode control (F-FTSMC) method is developed to study the relationship between the input voltage signal and output pressure. The uncertainties above can be expressed as:

R0 kf L0

FUZZY LOGIC RULES

EXPERIMENTAL SETUP AND RESULTS

CONCLUSION