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Active brake controls such as vehicle stability control, VSC, panic brake assist, PBA, etc. have recently been applied to many vehicles. We have developed a new hydraulic brake actuator for active brake control systems. This new hydraulic brake actuator is composed of hydraulic brake booster unit, power supply unit and control valve unit. This paper describes the design of the new hydraulic brake booster unit.

In this paper, we discuss vehicle directional stability and introduce advanced stability control (ASTC) to stabilize the vehicle during severe cornering. Vehicle behavior in a transient steering condition during severe cornering was analyzed by computer simulation. It was found that applying an external yaw moment makes the vehicle more stable. The effect of controlling the brake force response is also evaluated by simulation to determine the brake actuator response criteria. The actual vehicle test was performed with a pylon slalom using a hydraulic brake actuator. It is verified that the ASTC stabilizes the vehicle for transient steering maneuvers.