Steering: Description and Operation

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: SYSTEM DIAGRAM










POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: SYSTEM DESCRIPTION

1. DESCRIPTION

(a) In the Variable Flow Control (VFC) power steering system, the power steering ECU receives the steering angle signal, steering zero point memory, the steering speed, vehicle speed signal and engine speed signal through the CAN communication system. The power steering ECU also controls the power steering solenoid valve mounted on the vane pump assembly in accordance with whether the vehicle is driving straight or turning in order to supply an appropriate power steering fluid volume.

Furthermore, without regard to whether or not the vehicle is being turned, if the power steering ECU cannot receive the steering angle signal, steering zero point memory, vehicle speed signal or engine speed signal, the power steering warning light in the combination meter illuminates and the vehicle enters fail-safe mode. During fail-safe control, the resistance of the steering wheel increases drastically to inform the driver that the vehicle is in fail-safe mode.

2. FUNCTION OF MAIN COMPONENTS