Honda Prelude 1993 Service Manual page 658

With the engine running at idle in a parked car, fluid
flow through the sensor rotors is blocked because the
rotors are not turning. Theretore the gain control valve
moves to the left. On the gain control valve. the oritice
resistance is high on pump side, while it is low on the
reservoir side, with the result that pressure in the reac-
tion chambe, is lowered and steering assist is high.
FEED SIOE ORIFICE
RESERVOIR SIDE OiIFICE
RETURN
Hydraulic pressure in
response to thg car's
speed {High}
GAr{ CO|{TRO|-
VALVE
Pressure in reaction
chamber (Low)
As th€ car is driven. the rotors start turning and the fluid
returns to the reservoir, reducing the fluid pressure at
the gain control valve. Theretore, the gain controlvalve
bsgins to move to the right. The orifice resistance on
the pump and reservoir sides is appropriately balanced,
with the result that the reaction chamber is in the
medium range and the steering resistance is moderate.
Hvdraulic Pressure in reaponse
ro the car's sDeed (M€dium)
RESERVOIR SIDE ORIFICE FEED
REACTION CHAMBER
When the car is moving at high speed, the sensor
reduces the pressure turther and the gain control valve
moves furthsr to the right. The orifice pressure on the
pump side is low and the pressure on the reservoir side
is high, the fluid pressure in the reaction chamber is also
high giving the steering wheel less assist.
Hydraulic prossure in response
to the car's speed (Lowl
RETURl{
( c o n t ' d )
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