A trade-off strategy between longitudinal traction/braking and cornering force, which uses jerk information to mimic an expert driver's voluntary braking and turning actions, was devised. Based on this expert driver's strategy, an automatic longitudinal-acceleration control method (No DYC i.e., no Direct Yaw-moment Control) called G-Vectoring control was developed. With G-Vectoring control, vehicle acceleration is basically controlled in accordance with the vehicle lateral jerk caused by driver's steering maneuvers. A simulation and actual tests of a test vehicle fitted with G-Vectoring control were conducted in order to investigate acceleration and deceleration of the vehicle according to the change in lateral motion or steering input. The key findings of this simulation and testing are summarized as follows. First, the agility and stability of the vehicle can be precisely controlled by using the effect of a shift in vertical load generating the cornering force in each stage of a turn, namely, the beginning of the turn, during the turn, and the end of the turn. Second, at the beginning of the turn, a motion that levels the tire workloads on all four wheels can be achieved. Third, by adequate deceleration control, the maximum steering angle during cornering is reduced significantly, and course traceability can be improved dramatically. Fourth, roll rate and pitch rate can be reduced by a G-Vectoring mechanism. It is concluded that acceleration controlling by G-Vectoring has the potential to maintain a driver's feeling of compatibility.
Improvement in vehicle agility and stability by G-vectoring control
Steigerung der Agilität und Stabilität durch das neu entwickelte G-Vectoring Control
2009
51 Seiten, 44 Bilder, 5 Tabellen, 14 Quellen
Conference paper
English
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