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Development of an Integrated System of 4WS and 4WD by H∞ Control
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English
Abstract
A control law for integrating 4WS and 4WD systems is presented. It is based upon a non-linear vehicle model in which the lateral force acting on the tires changes according to the tire slip angle, slip ratio and the load. The purpose of the system is to make the actual yaw rate follow the desired yaw rate. A two-degree-of-freedom control structure has been devised and variable transformation is used to linearize the non-linear model so that H∞ control theory can be applied to design the feedback compensator. A new control theory is used to calculate optimum command values for the 4WS and 4WD actuators. Moreover, adaptive logic is added to reduce the desired yaw rate as the tires approach the limits of adhesion. Simulations and experiments prove the system greatly improves stability during cornering.
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Hirano, Y., Harada, H., Ono, E., and Takanami, K., "Development of an Integrated System of 4WS and 4WD by H∞ Control," SAE Technical Paper 930267, 1993, https://doi.org/10.4271/930267.Also In
References
- Sano S. et al. Four wheel steering system with rear wheel steer angle controlled as a function of steering wheel angle SAE paper 860625 1986
- Yamamoto M. et al. A study on active controlled chassis system for vehicle dynamics 11th IAVSD Symposium 1989
- Naito G. et al. Electronically Controlled Torque Split 4WD System for Improving Cornering Performance SAE Paper 900556 1990
- Hirano Y. et al. Integrated Control System of 4WS and 4WD by H▵ Control AVEC'92 Symposium 419 423 1992
- Chiang R. Safonov M. Robust-Control Toolbox The Math Works Inc. 1988
- Glover K. Doyle J. State-space formulae for all stabilizing controllers that satisfy an H∞-norm bound and relation to risk sensitivity Systems & Control Letters 11 167 172 1988