Adaptive Backstepping Sliding-Mode Control of the Electronic Throttle System in Modern Automobiles

Rui Bai,Shaocheng Tong

doi:10.1155/2014/383064

Rui Bai, Shaocheng Tong

Open Access

https://doi.org/10.1155/2014/383064

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Abstract

In modern automobiles, electronic throttle is a DC-motor-driven valve that regulates air inflow into the vehicle’s combustion system. The electronic throttle is increasingly being used in order to improve the vehicle drivability, fuel economy, and emissions. Electronic throttle system has the nonlinear dynamical characteristics with the unknown disturbance and parameters. At first, the dynamical nonlinear model of the electronic throttle is built in this paper. Based on the model and using the backstepping design technique, a new adaptive backstepping sliding-mode controller of the electronic throttle is developed. During the backstepping design process, parameter adaptive law is designed to estimate the unknown parameter, and sliding-mode control term is applied to compensate the unknown disturbance. The proposed controller can make the actual angle of the electronic throttle track its set point with the satisfactory performance. Finally, a computer simulation is performed, and simulation results verify that the proposed control method can achieve favorable tracking performance.

Highlights

In recent years, many important functions of modern automobiles are shifting from a purely mechanical to an electromechanical implementation
Its control system positions the throttle valve according to the reference opening angle which is provided by the engine control unit
The electronic throttle is increasingly being used in modern automobiles in order to improve the vehicle drivability, fuel economy, and emissions

Summary

Introduction

Many important functions of modern automobiles are shifting from a purely mechanical to an electromechanical implementation. The synthesis of a satisfactory electronic throttle control (ETC) system is difficult due to the presence of the strong nonlinear characteristic, unknown parameter, and disturbance This challenging control problem has attracted significant attention of the research community and automotive industry in recent years. In [18], the nonlinear hysteretic characteristic of the electronic throttle is described and the sliding-mode control method is proposed to control the electronic throttle. A new adaptive backstepping sliding-mode controller of the electronic throttle is developed in this paper. The proposed adaptive backstepping sliding-mode controller can achieve the satisfactory performance; that is, the actual angle of the electronic throttle can track its set point. This paper proposes and designs an adaptive backstepping sliding-mode controller for the electronic throttle.

Descriptions and Nonlinear Model of the Electronic Throttle

Adaptive Backstepping Sliding-Mode Control Design

Computer Simulation

Conclusions