System for steering rear wheels of an automotive vehicle

摘要

A system for steering a rear wheel of a vehicle having a mechanism for altering a steering ratio, THETA S, based on an amount of steering of the rear wheel to an amount of steering a front wheel. The system is disposed in an interconnecting mechanism for mechanically interconnecting the mechanism for steering the front wheel with the mechanism for steering the rear wheel. The value of THETA S is set by the following formula: THETA S=C1+BxC3x|Y|-C4x|dY| where THETA S is a steering ratio; Y is a yaw rate of a vehicle body; dY is a yaw acceleration of the yaw rate; C1 is a basic steering characteristic term; C3 is a yaw rate control gain; C4 is a yaw acceleration control gain; and B is a correction coefficient control gain term. The value of B increases when the amount of steering of the front wheel is small and decreases when the amount of steering of the front wheel is large.