Abstract
The control method of the conventional traction control system on split-μsurfaces improves vehicle acceleration performance, but influences its stability performance. To solve this problem, a hierarchical traction control system for ISG hybrid electric vehicles based on multi-objective dynamic coordination control (MHEVTCS) is proposed. In the upper level controller, a target driving torque calculating strategy based on dynamical sliding mode control is developed. In the lower level controller, such strategies as multi-objective dynamic coordination control strategy, brake torque control strategy based on an inverse model, target engine torque design strategy and torque dynamic coordinate control strategy are proposed. Detailed simulation and hardware-in-loop experiment results show that slipping wheels are controlled quickly, accurately and smoothly by MEHVTCS. MHEVTCS solves the problem of merely pursuing acceleration performance and neglecting stability performance of conventional traction control system.
Highlights
On split-μsurfaces, traction control system of conventional internal combustion engine vehicle (ICETCS) applies brake torque on the slipping wheel of low adhesion side road to improve vehicle’s acceleration performance[1][2]
In the lower level controller, several strategies such as multi-objective dynamic coordination control strategy, brake torque control strategy based on an inverse model, target engine torque design strategy and torque dynamic coordinate control strategy are proposed to control the engine torque demand T, the motor torque eTCS
Acceleration performance of hybrid electric vehicle (HEV) increases 220% than without MHEVTCS
Summary
On split-μsurfaces, traction control system of conventional internal combustion engine vehicle (ICETCS) applies brake torque on the slipping wheel of low adhesion side road to improve vehicle’s acceleration performance[1][2]. Additional yaw moment is caused which influences its stability performance. Compared to conventional internal combustion engine vehicle, HEV is easier to slip on slippery road[5][6]. If the control method of ICETCS on split-μ surfaces is continually used by HEV, more brake torque intervening should be used to maintain the slip ratio of slipping wheel at a desired value. More additional yaw moment will be caused that influences vehicle’s stability severely. Traction control system of HEV (HEVTCS) should be redesigned. Taking an ISG hybrid electric vehicle as the research object as shown in Figure, the traction control method of an ISG hybrid electric vehicle is researched in this paper
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