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4) System Control
During parking and driving in low speed, the control unit supplies approx. 1 A of electric current to
solenoid valve. Then, the spool located in PCV compresses the upper spring and elevates upward
and, the working pressure from oil pump (A port) is not able to flow to the reaction plunger (C
port). As a result, the pressing force from reaction plunger disappears and the steerability
enhances.
ECPS system, according to the vehicle
speed, enables to achieve proper steering
characteristics by controlling hydraulic
pressure to reaction plunger located in input
shaft of power steering gear box. In other
words, ECPS control unit enhances the
parking conveniences by controlling duty type
current control. It provides heavy steerability
with low current as the vehicle speed
increases. And, it provides light steerability
with high current as the vehicle speed
decreases.
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