DYNAMIC STABILITY CONTROL
04–15–10
During DSC control (to suppress understeer tendency)
• When a large understeer tendency is determined, the traction switch and the stability control solenoid valves
are energized, switching the hydraulic circuits. At the same time, the pump motor is actuated to operate the
pump, supplying brake fluid pressure from the reservoir to the inner rear wheel cylinder. Also at this time, the
inlet solenoid valve of the outer front wheel is energized and the hydraulic circuit of this wheel is closed.
• After a pressure increase, brake fluid pressure is adjusted using the three pressure modes (reduction,
maintain, increase) so that the target wheel speed is obtained. (The following figure shows control during a left
turn (during pressure increase mode).)
Solenoid Valve Operation Table
Hydraulic Circuit Diagram
End Of Sie
Traction switch
solenoid valve
Stability control
solenoid valve
Inlet solenoid valve Outlet solenoid valve
Pump
motor,
pump
LF—RR RF—LR LF—RR RF—LR LF RF LR RR LF RF LR RR
During
pressure
increase
mode
OFF
(open)
ON
(closed)
OFF
(closed)
ON
(open)
OFF
(ope
n)
ON
(clos
ed)
OFF
(open)
OFF (closed) Operating
During
pressure
maintain
mode
OFF
(open)
OFF
(closed)
OFF (closed)
OFF
(ope
n)
OFF
(clos
ed)
ON
(ope
n)
OFF
(ope
n)
OFF (closed) Operating
During
pressure
reduction
mode
OFF
(open)
OFF
(closed)
OFF (closed)
OFF
(ope
n)
OFF
(clos
ed)
ON
(clos
ed)
OFF
(ope
n)
OFF
(closed)
ON
(ope
n)
OFF
(clos
ed)
Operating
P
RF
LR
RR
LF
DAMPER CHAMBER
PUMP
MOTOR
PUMP
RESERVE
INLET
SOLENOID
VALVE
OUTLET
SOLENOID
VALVE
OUTLET
SOLENOID
VALVE
INLET
SOLENOID
VALVE
TRACTION
SWITCH
SOLENOID
VALVE
STABILITY
CONTROL
SOLENOID
VALVE
PRESSURE
INCREASE
MASTER CYLINDER
BRAKE FLUID
PRESSURE SENSOR
CHU0415S007
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