DESCRIPTION OF CONSTRUCTION AND OPERATION
ACTIVE STABILITY CONTROL SYSTEM (ASC)35C-22
When the brake fluid pressure is held by the TCL control/stability control (Example:
When the front-left/rear-right whee l system pressure is held)
AC600863AF
MP
Master cylinder
Hydraulic unit
Cut valve
Motor Outlet valve
(RR)Inlet valve (RR)
Wheel cylinder (RR) Suction valve
Pressure sensor
Inlet valve
(FL)
Pump
Outlet valve (FL) Wheel cylinder (FL)
By closing the inlet va lve (FL/RR) and o u tle t valve
(FL/RR), the br
ake f l uid pressure in the wh eel cylin
-
der can be main t a ined.
VA L VE CONDITION
ItemPower statusOpen/Close
Suction valveONOpen
Cut valveONClosed
Inlet valve (FL)ONClosed
Inlet valve (RR)ONClosed
Outlet valve (FL)OFFClosed
Outlet valve (RR)OFFClosed
DESCRIPTION OF CONSTRUCTION AND OPERATION
ACTIVE STABILITY CONTROL SYSTEM (ASC)35C-23
When the brake fluid pressure is reduced by the TCL control/stability control
(Example: When the front-lef t wheel system pressure is reduced/rear-right is held)
AC600863
Master cylinder
AG
Hydraulic unit
Suction valve
Cut valve Pressure sensor
Pump
Motor
MP
Outlet valve
(RR) Outlet valve (FL)
Inlet valve (RR)
Inlet valve
(FL)
Wheel cylinder (RR) Wheel cylinder (FL)
By open ing t he out let valve (FL), the fluid p r essure
applied to
the whee l cylinder (FL ) is returne d to the
master cylinder th
rough t he su ction va lve , reducing
the brake fluid p
r essure in the whe e l cylinder (FL).
The bra
k e fluid p r essure in the whe e l cylinder (RR)
can b
e held by keep ing t he in let valve (RR) and o u t
-
let valve (RR) clos ed.
VA L VE CONDITION
ItemPower statusOpen/Close
Suction valveONOpen
Cut valveONClosed
Inlet valve (FL)ONClosed
Inlet valve (RR)ONClosed
Outlet valve (FL)ONOpen
Outlet valve (RR)OFFClosed
DESCRIPTION OF CONSTRUCTION AND OPERATION
ACTIVE STABILITY CONTROL SYSTEM (ASC)35C-24
Traction control operation
ASC-ECU receives various kinds of information from
the engine ECU, steering wheel sensor, G and yaw
rate sensor, and wheel speed sensor. When
ASC-ECU determines that the driving wheel is slip
-
ping, it suppresses the wheel slippage. At this time,
ASC-ECU controls the brake fluid pressure of the
driving wheel determined to be slipping so that the
torque is transferred to another driving wheel. The operations of suction valve, cut valve, and solenoid
valve are basically the same as that of the stability
control. ASC-ECU and the engine ECU communi
-
cate with each other via CAN bus line. When the
accelerator pedal is depressed too far, the signal
requesting the engine output reduction is sent to the
engine ECU so that the TCL controllability can be
secured.
