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1.
PCV (Pressure Control Valve)
This valve controls the hydraulic pressure supplied to reaction device by moving the spool
valve according to the changes of solenoid valve.
2.
Reaction device
This device increases the steerability effect by binding the input shaft with supplied hydraulic
pressure from PCV.
3.
Solenoid valve
This valve determines the valve spool position in PCV with the electric current supplied from
ECPS control unit.
3) Operation of Solenoid Valve
SSPS control unit controls the current to solenoid valve according to the vehicle speed. Based on
this current, the solenoid valve changes the position of valve spool to control the hydraulic
pressure to the reaction plunger. Accordingly, the SSPS system can get the desired steering force
according to the vehicle speed.
1.
SSPS control unit outputs nearly maximum electrical current.
2.
The solenoid rod pushes PCV spool to right side.
3.
The hydraulic pressure coming from pump is not supplied to the reaction device as the spool
orifice is cut off.
4.
The hydraulic pressure is cut off and the manipulation of steering wheel becomes lighter.
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