Abstract: An electric power steering system includes a control for providing a calculated torque assist demand in the event of failure of a steering wheel torque sensor. The control is responsive to one or more of a vehicle speed, a steering column position, a steering column velocity, a gear lever position, a vehicle yaw rate and a vehicle lateral acceleration for generating the calculated torque assist demand. The control is operable to modify the torque assist demand by providing one or more of (a) friction and inertial compensation, (b) vehicle oversteer compensation, (c) reverse motion compensation, (d) damping compensation and (e) self steer prevention.

Abstract: An electric power steering system includes a control for providing a calculated torque assist demand in the event of failure of a steering wheel torque sensor. The control is responsive to one or more of a vehicle speed, a steering column position, a steering column velocity, a gear lever position, a vehicle yaw rate and a vehicle lateral acceleration for generating the calculated torque assist demand. The control is operable to modify the torque assist demand by providing one or more of (a) friction and inertial compensation, (b) vehicle oversteer compensation, (c) reverse motion compensation, (d) damping compensation and (e) self steer prevention.

Abstract: A periodic test signal is injected into a motion sensor and the sensor output is compared to a threshold to determine whether the sensor is functioning properly.

Abstract: Under certain operating conditions, the pressure applied to a vehicle rear brake circuit is increased above the pressure applied to the vehicle front brake circuit to enhance stopping of the vehicle.

Abstract: An apparatus and method for determining the presence of excessive yaw rate in a vehicle by calculating an instability index that is a function of the vehicle yaw rate and generating an excessive yaw rate signal when the instability index exceeds a yaw rate threshold.

Abstract: A method is provided for detecting a fault in a hydraulic brake system of a vehicle having a first hydraulic brake circuit and a second hydraulic brake. The first hydraulic brake circuit includes a pressure sensor. A pressure is measured within the first hydraulic brake circuit of the vehicle using the pressure sensor. An expected vehicle acceleration is estimated in response to the measured pressure. An actual vehicle acceleration is measured. A determination is made whether the expected vehicle acceleration is within a predetermined range of the actual acceleration. A first and second wheel differential is determined. A determination is made whether the first wheel differential and second wheel differential satisfy a predetermined condition.