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BRAKES - General Information
5-7
Ioil assembly,
Core-
Printed
Construction
Reduction
of the vehicle speed
Output characteristic
14Y70E
-
1
nnn
JWVL
Pulse generator
II
G-sensor
Brake pedal
-___----
---
-
-u
Control unit
(Determination
of the
optimum
condition)
indication
light
il
--:
---T-----
14Y69G
G-Sensor
(Detection
of the
Reduction
of
the
Vehicle
Speed)
The G-sensor
is composed
of a differential
transformer,
a
control
circuit (in the form of a printed
circuit board), etc. It is
installed
on the floor
of the baggage
compartment.
The core within
the differential
transformer
is usually stationary
at the center of the coil; however,
when a reduction
in speed is
applied,
the core moves
and a voltage
corresponding
to the
amount
of displacement
of the core is generated.
In other
words,
the extent
of the reduction
in the vehicle
speed
is
detected.
Control
Unit
(Signal
Control)
The control
unit is installed
inside the baggage
compartment.
It
receives
the signals from
the pulse generator,
the G-sensor,
and the brake
switch
(which
is also used as the stop
light
switch),
and transmits
the brake fluid pressure
control signal to
the modulator.
If there is a malfunction
in either the control
unit
or the modulator
(the solenoid
valve section),
or in the event of
an open circuit, the condition
is detected.
The brake system
is
returned
to conventional
operation,
and the fail indication
light
illuminates
to warn the driver of the existence
of a malfunction.
In addition,
if an open circuit occurs in the wiring of the control
unit
power
supply,
the
G-sensor,
the
inside
of the
pulse
generator,
or the brake switch
(input wiring),
or if all the stop
light
bulbs
burn out, the brake system
is returned
to conven-
tional operation,
and the fail indication
light illuminates
in the
same
way to warn
the driver.
The signal to lower the brake fluid pressure
of the rear brakes
causes the modulator
release valve (the valve used to lower the
brake fluid pressure)
to operate
in the event that the amount
of
slipping
of the tires on the road surface
becomes
greater
than
the specified
value which
is determined
in accordance
with the
speed
reduction
of the wheels
and also in the event
that the
speed
reduction
of the
wheels
becomes
greater
than
the
specified
value in relationship
to the reduction
of the vehicle
speed.
Note that there
is no lock-up control
of the rear brakes
when the speed of the vehicle is approximately
8 km/h (5 mph)
or less.
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