Mitsubishi Evolution X. Manual — part 158
DESCRIPTION OF CONSTRUCTION AND OPERATION
TSB Revision
ACTIVE SKID CONTROL SYSTEM (ASC)
35C-17
When brake fluid pressure is increased by skid control (or increased by TCL)
The system closes the cut valve to block the pas-
sage from the pump outlet to the master cylinder,
and opens the suction valve, connecting the passage
from the master cylinder to the pump inlet. The brake
fluid drawn from the master cylinder is supplied to
the wheel cylinder.
VALVE CONDITION
NOTE:
*
: Because the brake fluid pressure for each
wheel is controlled depending on the driving status,
the open/close status of inlet valve and outlet valve
changes according to the driving status.
.
AC703859AE
Hydraulic unit
Outlet valve
Inlet valve
Wheel
cylinder
(front)
Wheel
cylinder
(rear)
Wheel cylinder
brake fluid
pressure
sensor
Low pressure
accumulator
Brake fluid flow
Pump
Damping
chamber
Motor
Suction valve
Cut valve
Master cylinder
Wheel cylinder
brake fluid
pressure sensor
Outlet valve
Inlet valve
Master cylinder
brake fluid
pressure sensor
Suction
damper
Item
Power status
Open/Close
Cut valve
ON
Closed
Suction valve
ON
Open
Inlet valve
*
OFF
Open
Outlet valve
*
OFF
Closed
DESCRIPTION OF CONSTRUCTION AND OPERATION
TSB Revision
ACTIVE SKID CONTROL SYSTEM (ASC)
35C-18
When brake fluid pressure is held by skid control (or held by TCL)
In order to hold the brake fluid pressure in the wheel
cylinder, the system closes the cut valve, suction
valve, and outlet valve.
Valve status
NOTE:
*
: In order to control the brake fluid pressure
supplied to each wheel based on the vehicle driving
status, the inlet valve and outlet valve are
opened/closed.
.
AC703859AF
Hydraulic unit
Outlet valve
Inlet valve
Wheel
cylinder
(front)
Wheel
cylinder
(rear)
Wheel cylinder
brake fluid
pressure
sensor
Low pressure
accumulator
Brake fluid flow
Pump
Damping
chamber
Motor
Suction valve
Cut valve
Master cylinder
Wheel cylinder
brake fluid
pressure sensor
Outlet valve
Inlet valve
Master cylinder
brake fluid
pressure sensor
Suction
damper
Item
Power status
Open/Close
Cut valve
ON
Closed
Suction valve
OFF
Closed
Inlet valve
*
OFF
Open
Outlet valve
*
OFF
Closed
DESCRIPTION OF CONSTRUCTION AND OPERATION
TSB Revision
ACTIVE SKID CONTROL SYSTEM (ASC)
35C-19
When brake fluid pressure is decreased by skid control (or decreased by TCL)
The system opens the outlet valve while closing the
inlet valve to store the brake fluid filled in the wheel
cylinder in the low pressure accumulator. The brake
fluid stored in the low pressure accumulator returns
to the master cylinder for circulation when the pump
is driven by the motor.
VALVE CONDITION
NOTE:
*
: In order to control the brake fluid pressure
supplied to each wheel based on the vehicle driving
status, the inlet valve and outlet valve are
opened/closed.
AC703859
Master cylinder
Hydraulic unit
Wheel
cylinder
(front)
Wheel
cylinder
(rear)
Inlet valve
Damping
chamber
Pump
Motor
Brake fluid flow
Suction valve
Cut valve
Wheel cylinder
brake fluid
pressure
sensor
AB
Suction
damper
Low pressure
accumulator
Outlet valve
Master cylinder
brake fluid
pressure sensor
Outlet valve
Inlet valve
Wheel cylinder
brake fluid
pressure
sensor
Item
Power status
Open/Close
Cut valve
OFF
Open
Suction valve
OFF
Closed
Inlet valve
*
ON
Closed
Outlet valve
*
ON
Open
DESCRIPTION OF CONSTRUCTION AND OPERATION
TSB Revision
ACTIVE SKID CONTROL SYSTEM (ASC)
35C-20
TCL OPERATION
ASC-ECU receives various kinds of information from
the engine control module, TC-SST-ECU,
S-AWC-ECU, steering wheel sensor, G and yaw rate
sensor, and wheel speed sensor. When ASC-ECU
determines that the driving wheel is slipping, it sup-
presses 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 trans-
ferred to another driving wheel. Basically, the opera-
tions of ABS solenoid valve and ASC valve are the
same as with the skid control. ASC-ECU, engine
control module, TC-SST-ECU, and S-AWC-ECU
communicate with each other via the CAN bus lines.
When the accelerator pedal is depressed too far, a
signal requesting to reduce the engine output is sent
to the engine control module. Also, a joint control
with TC-SST-ECU and S-AWC-ECU are performed
to secure the TCL controllability.
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