Session: AVT-02-01: Advances in Methods for Ground Vehicle Systems Design

Paper Number: 142603

142603 - The Effect of Variation in Filling Rate on Hydraulic Retarder Control 

The foundation for developing autonomous driving is the precise regulation of the actuator through the control system. In heavy commercial or agricultural vehicles, hydraulic retarders are a common auxiliary braking system that can prevent catastrophic accidents caused by thermal failure of the main brake system. A working chamber and a control system that work together make up the hydraulic retarder. However, most research on the hydraulic retarder’s control system is focused on the control valve’s performance characteristics, while the effects of changes in the hydraulic retarder’s working chamber during braking on the control system are neglected. This paper adopts the mathematical model of a hydraulic retarder based on Rankine-vertex dynamics and creates a control system model for a hydraulic retarder that takes into account variations in the filling rate of the working chamber. Analyses and experiments are conducted to assess and verify the effect of changes in the working chamber’s filling rate on the control pressure. When the control pressure is maintained, an increase in the rotational speed decreases the filling rate, necessitating a subsequent decrease in the current. Conversely, if the rotational speed decreases, the filling rate escalates, thus warranting an increase in the current. The study provides valuable guidance and references for refining hydraulic retarder control systems’ design and control strategies, leading to more precise brake torque control.    

Presenting Author: Ruibo Hu Tsinghua University

Presenting Author Biography: Master student in Tsinghua university, a member of State Key Laboratory of Intelligent Green Vehicle and Mobility. Research interest: active steering, motor control, vehicle dynamic control

Authors:

Yong Huang Tsinghua university
Liangyao Yu Tsinghua University
Ruibo Hu Tsinghua University