Abstract
The single-motor full hybrid electric vehicle tends to suffer drivability and excessive clutch wear issues during the mode transition from electric driving to hybrid driving because the single motor must simultaneously propel the vehicle and divert torque via clutch engagement to start the engine. In this study, a novel four-phase compound robust control method consisting of the feedforward–feedback technology and the robust compensation approach is proposed to address these problems during the mode transition. The whole mode transition process was divided into four consecutive phases according to the operating status of engine and clutch. In each phase, a nominal controller based on the feedforward–linear quadratic regulator feedback technology is first designed for the nominal linear model to guarantee a desired control performance. And then, the nonlinear uncertain part of the engine/clutch torque and the vehicle resistant torque as well as the model parameter uncertainties are all considered as equivalent disturbances, and a robust compensator is introduced to suppress the effect of equivalent disturbances. Simulation is performed to validate the effectiveness of the proposed control method. The results show that the four-phase compound robust control method can achieve better vehicle drivability and minimize clutch wear during the mode transition from electric driving to hybrid driving even in the presence of various torque disturbances and parameter uncertainties.
Highlights
Due to strict emission regulation and high fuel economy requirements, the development of environmentfriendly electric vehicles have become a priority in the automobile industry
The main purpose of this study is to propose a novel mode transition control method to address the issues of vehicle drivability and excessive clutch wear during the EV-to-Hybrid electric vehicles (HEVs) mode transition for the SM-FHEV
A novel four-phase compound robust control method was proposed to address the issues of vehicle drivability and excessive clutch wear during the EVto-HEV mode transition for the SM-FHEV
Summary
Due to strict emission regulation and high fuel economy requirements, the development of environmentfriendly electric vehicles have become a priority in the automobile industry. We aim to propose a novel control method to coordinate the motor, engine, and clutch during EV-to-HEV mode transition in order to improve the vehicle drivability and minimize clutch wear for the SM-FHEV. Dai et al.[7] proposed a coordinated control strategy using clutch pressure PID control and motor torque compensation to achieve a seamless EV-to-HEV mode transition for a parallel hybrid vehicle. The main purpose of this study is to propose a novel mode transition control method to address the issues of vehicle drivability and excessive clutch wear during the EV-to-HEV mode transition for the SM-FHEV. The nonlinear characteristics of engine/clutch torque and vehicle resistance torque and the parameter uncertainties are taken into account simultaneously, and a novel fourphase compound robust control method consisting of feedforward-feedback technology and robust compensation approach is presented. According to the operating status of the wet clutch, the dynamic equations of the SM-FHEV can be expressed as follows:
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