Chapter 8 - Vehicle Active Motion Controls

Abstract

The vehicle active motion controls with additional front and/or rear wheel active steer and direct yaw moment control (DYC) by transversal split control of tire longitudinal forces are dealt with in this chapter. Together with some introduction of the rear wheel steer controls at the early stage of the developments, zero side slip control by the rear wheel active steer controls are introduced. The feed-forward type and feed-forward+feedback type of response model following rear wheel steer controls are discussed. Next the feed-forward type of additional front and rear wheel active steer control is introduced to show that any form of side slip and yaw rate responses to steering wheel input are available by the active steer control. Following the explanations of the passive DYC by differential controls, the feed-forward and feed-forward+feedback type of model following controls as well as zero side slip DYC are studied. A practical advantage of DYC compared with the other active steer controls for the vehicle motion control especially under severe conditions is also discussed.