Mazda X-5. Manual — part 64

DYNAMIC STABILITY CONTROL

04–15–7

04–15

Operation
During normal braking

• During normal braking, the solenoid valves are not energized and all of them are off. When the brake pedal is

depressed, brake fluid pressure is transmitted from the master cylinder, through the traction switch and inlet
solenoid valves, and then to the caliper piston.

Solenoid valve operation table

Hydraulic circuit diagram

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

OFF (open)

OFF (closed)

OFF (open)

OFF (closed)

Stopped

P

RF

LR

RR

LF

MASTER CYLINDER

TRACTION
CONTROL
SOLENOID
VALVE

TRACTION
CONTROL
SOLENOID
VALVE

BRAKE FLUID
PRESSURE SENSOR

STABILITY
CONTROL
SOLENOID
VALVE

STABILITY
CONTROL
SOLENOID
VALVE

INLET
SOLENOID
VALVE

INLET
SOLENOID
VALVE

INLET
SOLENOID
VALVE

INLET
SOLENOID
VALVE

OUTLET
SOLENOID
VALVE

OUTLET
SOLENOID
VALVE

OUTLET
SOLENOID
VALVE

OUTLET
SOLENOID
VALVE

DAMPER CHAMBER

RESERVOIR

RESERVOIR

PUMP
MOTOR

PUMP

PRESSURE
INCREASE

PRESSURE
INCREASE

PRESSURE
INCREASE

PRESSURE
INCREASE

E5U415ZS5005

DYNAMIC STABILITY CONTROL

04–15–8

During ABS and EBD control

• During ABS and EBD control, when wheel lock-up is about to occur, the traction switch and stability control

solenoid valves are not energized, and the inlet and outlet solenoid valves are energized and controlled in three
pressure modes (increase, reduction or maintain), thereby adjusting brake fluid pressure. Brake fluid during
pressure reduction is temporarily stored in the reservoir and afterwards the pump motor operates the pump to
return the fluid to the master cylinder. (The following figure shows these conditions: right front wheel pressure
increased, left front wheel pressure maintained, and both rear wheels pressure decreased.)

Solenoid valve operation table

Hydraulic circuit diagram

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

OFF (open)

OFF (closed)

OFF (open)

OFF (closed)

Stopped

During

pressure

maintain

mode

OFF (open)

OFF (closed)

ON (closed)

OFF (closed)

Stopped

During

pressure

reduction

mode

OFF (open)

OFF (closed)

ON (closed)

ON (open)

Operating

P

RF

LR

RR

LF

MASTER CYLINDER

TRACTION
CONTROL
SOLENOID
VALVE

TRACTION
CONTROL
SOLENOID
VALVE

BRAKE FLUID
PRESSURE SENSOR

STABILITY
CONTROL
SOLENOID
VALVE

STABILITY
CONTROL
SOLENOID
VALVE

INLET
SOLENOID
VALVE

INLET
SOLENOID
VALVE

INLET
SOLENOID
VALVE

INLET
SOLENOID
VALVE

OUTLET
SOLENOID
VALVE

OUTLET
SOLENOID
VALVE

OUTLET
SOLENOID
VALVE

OUTLET
SOLENOID
VALVE

DAMPER CHAMBER

RESERVOIR

RESERVOIR

PUMP
MOTOR

PUMP

PRESSURE
INCREASE

PRESSURE
REDUCTION

PRESSURE
MAINTAINED

PRESSURE
REDUCTION

PUMP

E5U415ZS5006

DYNAMIC STABILITY CONTROL

04–15–9

04–15

During DSC control (suppress oversteer tendency)

• When a large oversteer 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 outer front wheel cylinder. Also at this time, the inlet
solenoid valve of the inner rear 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 a left turn (during
pressure increase mode).)

Solenoid valve operation table

Hydraulic circuit diagram

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)

ON

(clos

ed)

OFF
(ope

n)

ON

(clos

ed)

OFF
(ope

n)

OFF (closed)

Operating

During

pressure

maintain

mode

OFF

(open)

OFF

(closed)

OFF (closed)

OFF
(ope

n)

ON

(clos

ed)

OFF

(clos

ed)

ON

(ope

n)

OFF (closed)

Operating

During

pressure

reduction

mode

OFF

(open)

OFF

(closed)

OFF (closed)

OFF
(ope

n)

ON

(clos

ed)

OFF

(clos

ed)

ON

(ope

n)

OFF

(clos

ed)

ON

(ope

n)

OFF

(clos

ed)

ON

(ope

n)

Operating

P

RF

LR

RR

LF

MASTER CYLINDER

TRACTION
CONTROL
SOLENOID
VALVE

BRAKE FLUID
PRESSURE SENSOR

STABILITY
CONTROL
SOLENOID
VALVE

INLET
SOLENOID
VALVE

INLET
SOLENOID
VALVE

OUTLET
SOLENOID
VALVE

OUTLET
SOLENOID
VALVE

DAMPER CHAMBER

RESERVOIR

PUMP
MOTOR

PUMP

PRESSURE
INCREASE

E5U415ZS5017

DYNAMIC STABILITY CONTROL

04–15–10

During DSC control (to suppress understeer tendency) and TCS control

• 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, thereby increasing pressure by supplying brake fluid pressure to the caliper piston of the inner rear
wheel or the slipping driving wheel. 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 a left turn, or control
of left rear wheel spin (during pressure increase mode).)

Solenoid valve operation table

Hydraulic circuit diagram

End Of Sie

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

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

MASTER CYLINDER

TRACTION
CONTROL
SOLENOID
VALVE

BRAKE FLUID
PRESSURE SENSOR

STABILITY
CONTROL
SOLENOID
VALVE

INLET
SOLENOID
VALVE

INLET
SOLENOID
VALVE

OUTLET
SOLENOID
VALVE

OUTLET
SOLENOID
VALVE

DAMPER CHAMBER

RESERVOIR

PUMP
MOTOR

PUMP

PRESSURE
INCREASE

E5U415ZS5008