Security system for protecting braking system against inadvertent automatic operation comprises valve releasing oil at pressure from wheel brake cylinder to low pressure storage tank if anomaly occurs

摘要

Sensors detect brake pedal operation (73,79), master cylinder output pressure (75,84), vehicle speed (76,87) and presence of automatic braking control signal. If central calculator detects anomaly such as brake operation without pedal (72) action or automatic braking (X) signal, valve (68) opens to release oil at pressure from wheel brake cylinder (61) to low pressure storage tank (67).