Mitsubishi Eclipse. Technical Information Manual (1994) — part 67
DRIVE-CONTROL COMPONENTS ABS
ABS ELECTRICAL CIRCUIT DIAGRAM
Ignition
switch
Ignition
F u s i b l e l i n k ( 2 )
switch ,
Fusib i
Fusit
link (9)
Dedicated
fuse
Dedicated
fuse
Combination
meter
Stop light
switch
power
relay
Diode
rnit (HU)
5
7
ABS
valve
relay
2 6
7
Motor
relay
relay
Motor
7
power
stop
light
I
1
Solenoid
valve
ABS-ECU
r
ECU power
2
4
Resistor
29
Wheel speed sensor
1
2
3
4
5
6
7
9 10 11 12 13 14 15 16 17 18
ABS-ECU Connector Pin Configuration
DRIVE-CONTROL COMPONENTS ABS
ABS HYDRAULIC FUNCTION SCHEMATIC
The ABS in the AWD models is of two-channel sys-
tem (two-fluid pressure system). this system, the
solenoid valves are energized or de-energized so
that the front and rear wheel brakes on the same
side are controlled on the “Select Low” rule.
For example, when either the front or rear wheel
on the right side is about to be locked, all the solenoid
valves on the right side, including those on the front
right wheel, are controlled to hold or slightly reduce
the fluid pressure. In order to prevent one wheel
locking state in the rear wheels, it is necessary
to control the rear wheels by Select Low as in the
FWD vehicles. In the case of the AWD vehicles,
the rear right and left wheels are subject to Select
Low control by the Select Low valves. As a result,
the fluid pressure for a total of three wheels (the
front right wheel and the rear right and left wheels)
are under simultaneous control.
Select-low: this is a method of providing the same
hydraulic control to both wheels when either wheel
is about to lock, matching it to the side about to
lock, or a method to control by matching pressure
to the low side.
Master cylinder
Wheel speed sensor (FR)
sensor (FL)
sensor (FL)
Wheel
Hydraulic Unit (HU)
Hydraulic Unit (HU)
Front left wheel
Front right wheel
Solenoid
valve control
Solenoid
valve control
Select Low
R e s e r v o i r
Select Low
I
n
Wheel speed
sensor (RR)
Rear right wheel
Rear left wheel
DRIVE-CONTROL COMPONENTS ABS
REAR
Knuckle
Rotor
0
Drive shaft
Speed
sensor
S E N S O R
WHEEL SPEED SENSOR
The wheel speed sensor of the AWD vehicle is the same as
in the FWD vehicle, except that the rear rotor is mounted on
the drive shaft. (Refer to P. 3-31.)
STOP LIGHT SWITCH
The same as in the FWD vehicle. (Refer to P. 3-31.)
G SENSOR
The G sensor, mounted inside the center console panel, detects
the longitudinal acceleration/deceleration (body G) of the ve-
hicle body.
Construction and operation
The inside of the sensor is shown at left. A semiconductor
strain gauge has been adopted as the sensor.
DRIVE-CONTROL COMPONENTS ABS
Piezo diffusion
resistor
Weight
Damping
oil
Bridge circuit
Piezo diffusion
resistor
-0.1
0
1.0
Rate of
Decele-
ration
acceleration
ration
output
characteristics
Output voltage (V)
I
The semiconductor strain gauge type sensor, constructed as
shown at the left, consists of a weight mounted at the free
end of an N-type silicon leaf spring, and four P-type diffusion
layers made on the surface of the leaf spring to constitute
piezo diffusion resistors. The case is filled with a damping
oil to prevent breakdown that may be caused by resonance.
The piezo diffusion resistors, arranged as shown at the left,
complete a bridge circuit which constitutes a semiconductor
strain gauge.
When the sensor is placed under strain by acceleration, the
piezoelectric effect changes its electrical resistance, causing
the bridge circuit to go out of balance.
If a voltage is applied across the bridge circuit, the acceleration
can be measured by detecting the amount the bridge circuit
goes out of balance in terms of a change in the voltage.
The output characteristics vary as shown at the left in the
direction of acceleration with 2.5 V as 0 G.
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