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International Journal of Automotive Technology > Volume 12(1); 2011 > Article
International Journal of Automotive Technology 2011;12(1): 45-49.
TORQUE-BASED OPTIMAL VEHICLE SPEED CONTROL
M. HONG1, M. OUYANG2, T. SHEN1
1Tsinghua University
2Beijing
3Sophia University
ABSTRACT
This paper describes an optimal vehicle speed controller that uses torque-based control concepts. The controller design was divided into two steps: first, for a given vehicle speed trajectory, the engine torque demand was determined; in the second stage, a torque controller was implemented to track this torque demand. The torque demand was determined by a primary component and a correction component. The primary component was determined by solving an off-line optimization problem, and the correction component was added to compensate for the error caused by the off-line optimization. A modelbased proportional-integral (PI) feedback torque controller was employed to realize the engine torque tracking. Simulation results generated by a benchmark simulator were given to demonstrate performance of the optimal vehicle speed controller and a conventional PI speed controller that was included for comparison.
Key Words: Torque control, Vehicle speed control, Optimal control, Automotive control
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