DESCRIPTION
In the Variable Flow Control (VFC) power steering system, the power steering ECU assembly receives the steering angle signal, steering sensor zero point memory, steering speed, vehicle speed signal and engine speed signal through the CAN communication system. The power steering ECU assembly also controls the variable flow control solenoid valve (vane pump assembly) 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 assembly cannot receive the steering angle signal, steering sensor 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.
FUNCTION OF MAIN COMPONENTS
| Item | Function |
|---|---|
| Power steering warning light | Illuminates to inform the driver that a malfunction in the power steering system has occurred. |
| Variable flow control solenoid valve (vane pump assembly) | Controls the power steering fluid volume according to the control signals from the power steering ECU assembly. |
| Power steering ECU assembly | Processes the signals sent from the skid control ECU (brake actuator assembly), steering sensor and ECM, and controls the variable flow control solenoid valve (vane pump assembly). |
| Steering sensor | Transmits the steering angle signal and steering sensor zero point memory to the power steering ECU assembly via CAN communication. |
| Skid control ECU (brake actuator assembly) | Transmits the vehicle speed signal to the power steering ECU assembly via CAN communication. |
| ECM | Transmits the engine speed signal to the power steering ECU assembly via CAN communication. |