HYBRID EPS SYSTEM: System Description: Notes

The system is composed primarily of the power steering oil pump assembly (power steering control module, power steering motor, power steering oil pump, and reservoir tank), hydraulic pipes, and steering gear assembly (torque sensor, flow connection valve, cylinder, and steering gear).
System hydraulic pressure from the power steering motor drives the power steering oil pump.
The power steering control module controls the speed of the power steering motor according to the vehicle speed, and varies the power steering oil pump flow to control the steering assist force. The operating direction of the power steering motor is controlled according to the steering direction, and the assist direction is controlled by changing the pump operating direction.
After the vehicle is READY or after engine start, the system controls the assist force, and the power steering control module drives the power steering motor to generate assist force only when steering wheel is turned.
If a malfunction occurs in the system, the fail-safe function stops the system (manual steering state) or restricts its operation (certain steering assist force). Refer to "HYBRID EPS SYSTEM: Fail-safe ".
If the power steering function is used continuously for an extremely long period of time, the protection function reduces the output to the power steering motor. Refer to "HYBRID EPS SYSTEM: Protection Function ".