Anti-Lock Brake System
Anti-Lock Brake System
The Anti-Lock Brake System
(ABS) works by measuring how
fast the wheels are turning
during braking and comparing
their speeds. If any wheel is
rotating much slower than the
others (on the verge of locking
up and skidding), the system
reduces hydraulic pressure to
that wheel's brake caliper. When
that wheel's speed matches the
other wheels, the system applies
normal hydraulic pressure. This
can take place several times per
second at each wheel. You feel
the ABS working as rapid
pulsations in the brake pedal.
Each wheel has a wheel speed
sensor assembly. As the wheel
rotates, the sensor sends
electrical pulses to the ABS
control unit. The pulse frequency
varies with the wheel speed.
The electrical output of the ABS
control unit is connected to the
modulator/solenoid unit. During
braking, the ABS control unit
monitors the pulse frequencies
from the four wheels. When the
control unit detects a wheel
locking up, it energizes the
appropriate solenoid in the
modulator/solenoid unit. There
are three solenoids: one for each
front wheel, and one for the rear
wheels. The energized solenoid
reduces hydraulic pressure to
one side of a modulator valve.
This, in turn, reduces hydraulic
pressure in the brake line going
to the affected wheel. When that
wheel speeds up because of the
reduced braking effort, the
control unit de-energizes the
solenoid. This builds hydraulic
pressure on the modulator valve.
The pressure increases in the
hydraulic line to the wheel.
For the system to react quickly,
the modulator/solenoid unit
must have brake fluid under high
pressure. This is supplied by a
diaphragm-type accumulator
that is pressurized by an electric
pump. A pressure-sensing switch
on the accumulator controls this
pump.
The control unit also contains
error detection circuitry. It
monitors the operation of the
wheel sensors, solenoids, pump,
and electronics. If the control
unit detects any faults, it shuts
off power to the pump motor and
solenoids. The light on the
instrument panel comes on. The
brakes then work like a
conventional system without
anti-lock capabilities.
Technical Information
Содержание 1996 Accord Wagon
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Страница 170: ...Fuses UNDERHOOD FUSE BOX EX Taking Care of the Unexpected...
Страница 171: ...Fuses ABS FUSE BOX INTERIOR FUSE BOX Taking Care of the Unexpected...
Страница 177: ...Specifications 1 LX 2 EX Technical Information...