Downhill Assist Control Method for Hybrid Electric Vehicle

doi:10.3901/JME.2016.06.136

Abstract

Abstract: To alleviate the burden for driving a hybrid electric vehicle(HEV) during downhill, a downhill assistant hierarchical control technique is presented. It can satisfy the driver’s maneuver intention, meanwhile, improve the performance of braking energy regeneration. According to driver’s intention and safety requirements, in the upper controller, start and exit strategies are put forward, and the goal of the downhill assistant control is set. Based on the control object, the total demanded torque is computed by proportional integral derivative(PID) in the middle controller, which is distributed to different braking systems according to the braking torque distribution strategy. This strategy is developed after considering brake capacity and principle of each of the braking systems, which can be divided as several forms including motor, motor-engine joint and motor-engine-hydraulic joint brake. Focusing on difference of response characteristics of each module, the lower controller proposes dynamic coordination control strategies for the access of engine and changing of hydraulic torque. A vehicle test is carried out to verify the control method. The results show that while reducing the burden of drivers and enhancing the downhill safety performance of HEV, the method can reduce fuel consumption and improve comfort.

Key words: down-hill assistant, driving safety, dynamic coordination, hybrid electric vehicle

CLC Number:

U461

HAN Yunwu, LUO Yugong, LI Keqiang, CHEN Long. Downhill Assist Control Method for Hybrid Electric Vehicle[J]. Journal of Mechanical Engineering, 2016, 52(6): 136-144.

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