VSA - VSA Control: Overview

The VSA modulator-control unit calculates the target yaw rate from the wheel speed signal, lateral acceleration signal and steering angle signal and compares the calculated target yaw rate against the actual yaw rate to make a judgment on the slip condition of the vehicle. The VSA modulator-control unit calculates the target fluid pressure based on this condition, determines one of three fluid pressure control modes (increase, decrease or hold), and adjusts the fluid pressure of the applicable wheel accordingly.