TORQUE-BASED OPTIMAL VEHICLE SPEED CONTROL |
M. HONG1, M. OUYANG2, T. SHEN1 |
1Tsinghua University 2Beijing 3Sophia University |
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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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