Mitsubishi MOTORS Outlander 2007, Руководство по обслуживанию, техническая информация и данные по ремонту кузова, Страница: 235 / 473

The ABS-ECU calculates the speed and
deceleration of each wheel based on the signals
from the four wheel speed sensors and the G
sensor incorporated in the ABS-ECU, and
estimates the vehicle speed at that time.
When the brake pedal is depressed, the brake fluid
pressure applied to the wheel cylinder increases,
and the wheel speed decreases. When the
difference between the wheel speed and vehicle
speed increases, and the vehicle deceleration
goes below the specified value (Point A), ECU
determines that the wheels are about to be locked.
At this time, ECU reduces the brake fluid pressure
by outputting the pressure decrease signal to the
solenoid valves (IN, OUT). (between a and b)
When the vehicle deceleration and wheel speed
begin recovery, and the vehicle speed reaches the
point B, ECU outputs the pressure hold signal to
maintain the wheel cylinder fluid pressure.
(between b and c)
When the wheel speed deceleration is further
recovered and overpasses the point C, ECU
determines that the wheel lock possibility has been
eliminated and increases the brake fluid pressure
by outputting the pressure increase signal again.
(between c and d)
Brake fluid pressure is controlled by repeating the
increase and hold of the pressure. (between d and
e)
When the wheel deceleration goes below the
threshold again, ABS-ECU controls the brake fluid
pressure by repeating the cycle (Step 2 to 5).
Four-wheel control
ABS fluid pressure is controlled independently for four
wheels.
EBD hydraulic pressure control
ZC500798
Ideal distribution curve for
fixed passengers boarding
Brake force distribution curve by
conventional proportioning valve
EBD operation conceptual diagram
Rear braking force
Front braking force
Ideal distribution curve for
one passenger boarding
Enhanced braking force
EBD braking force distribution range
EBD control is activated in a range with lower slip ratio
where ABS is disabled. EBD calculates vehicle
deceleration and slip amount of the four wheels based
on the wheel speed sensor signal. If the rear wheel
speed differs from the vehicle speed by a certain level
or more, EBD increases, holds, and decreases the
pressure at the rear wheel control solenoid valve in
the hydraulic unit, and then adjusts rear wheel brake
fluid pressure fairly close to an ideal distribution curve.
INITIAL CHECK
ABS-ECU performs the following initial checks using
the diagnostic functions. ABS-ECU illuminates the
ABS warning light for 3 seconds (including the initial
check)*after the ignition switch is turned ON. If any
malfunction is detected, ABS-ECU continues
illuminating the ABS warning light and disables ABS
control.
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