Mazda 2007 CX-9, Service Highlights

Page: 202 / 614

DYNAMIC STABILITY CONTROL/ROLL STABILITY CONTROL
04-18–14
During DSC control (to suppress understeer tendency)
•
When a large understeer tendency is determined, the traction control solenoid and 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 pressure-retention 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
Traction control
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
ON (closed)
OFF
(closed)
ON
(open)
OFF
(ope
n)
ON
(clos
ed)
OFF
(open)
OFF (closed) Operating
During
pressure
maintain
mode
OFF
(open)
ON
(closed)
OFF (closed)
OFF
(ope
n)
ON (closed)
OFF
(ope
n)
OFF (closed) Operating
During
pressure
reduction
mode
OFF
(open)
ON
(closed)
OFF (closed)
OFF
(ope
n)
ON (closed)
OFF
(ope
n)
OFF
(closed)
ON
(ope
n)
OFF
(clos
ed)
Operating
3423-1U-06H(04-18).fm 14 ページ ２００６年１１月２２日 水曜日 午後２時３８分