Mitsubishi Lancer Evolution 7. Manual — part 16
POWER TRAIN - ACD and AYC
2-17
TRANSFER LIMITED SLIP DIFFERENTIAL
During acceleration and deceleration, the piston is moved in the right direction according to the oil pressure
from the hydraulic unit to connect the hydraulic multi plate clutch (friction plate and disc) and set the
center differential to the direct engagement state as much as possible. This improves the acceleration
performance and stability during deceleration.
During turning, the oil pressure from the hydraulic unit stops, the piston operates in the left direction
to release the hydraulic multi plate clutch and free the center differential to improve the turning performance.
If the parking brake is pulled while driving at a vehicle speed above 5 km/h, the hydraulic multi plate
clutch will also be released and the center differential set as close as possible to the free state.
Transfer hydraulic case
Piston
Thrust bearing
Hydraulic multi plate clutch
(Friction plate and disk)
ACD transfer
Hydraulic unit
assembly
A
A
Section A - A
<During acceleration
and deceleration>
<During turning>
POWER TRAIN - ACD and AYC
2-18
HYDRAULIC UNIT
The hydreaulic unit is composed of the accumulator (electric pump, pressure sensor, accumulator) and
pressure controller (proportional valve, directional valve).
The pressure accumulator intermittently operates the pump, and accumulates the control pressure required
in the accumulator.
The pressure controller operates the proportional valve and directional valve, and supplies the appropriate
oil pressure to the ACD transfer or AYC torque transfer differential according to the signals from the
4WD-ECU.
SPECIFICATIONS
Specifications
Specifications
Electric pump
Trochoidal type
Operating oil
ATF SP III
Proportional valve
Current proportional control type
Directional valve
3 position electromagnetic switching method
Wheel speed sensor
Longitudinal G sensor
Lateral G sensor
Steering wheel sensor
4WD-ECU
Engine-ECU
ABS-ECU
ACD mode
indicator lamp
Directional
valve
Proportional
valve (AYC)
Pressure sensor
Electric pump relay
Hydraulic multi
plate clutch
Right
AYC clutch
Accu-
mulator
Electric
pump
Hydraulic unit assembly
Left
ACD transfer
Electronic control system
Oil pressure control system
Parking brake switch
ACD mode switch
Stop lamp switch
TPS
Proportional
valve (ACD)
Proportional valve
Supplies the oil pressure required for ACD or AYC control
according to the instructions of the 4WD-ECU.
Proportional
valve <ACD>
Proportional
valve <AYC>
POWER TRAIN - ACD and AYC
2-19
When the proportional valve is OFF, the oil pressure from
the electric pump will be cut off by the proportional valve.
For this reason, oil pressure will be supplied to the ACD
or AYC and each system will be set into the non-operating
state.
When the proportional valve turns ON, the proportional valve
opens, and the oil pressure from the electric pump will be
supplied to the ACD hydraulic multi plate clutch or AYC
directional valve.
Directional valve
Supplies the oil pressure required for controlling the AYC
clutch according to the instructions of the 4WD-ECU.
When the directional valve is OFF, the oil pressure from the
proportional valve <AYC> will be cut off by the directional
valve. For this reason, the clutch will set into the non-operating
state without oil pressure supplied to each clutch of the AYC.
When oil pressure supply signal for the AYC clutch <Right
side> is sent to the directional valve from the 4WD-ECU,
the directional valve will move to the right. As a result, the
oil pressure from the proportional valve <AYC> will be supplied
to the AYC clutch <Right side>.
If the oil pressure supply signal to the AYC clutch <Left side>
is sent to the directional valve, the directional valve will move
to the left.
From electric pump
Proportional
valve (OFF)
From electric pump
Return
To ACD hydraulic multi plate
clutch or AYC directional valve
Proportional
valve (ON)
Directional
valve
From proportional
valve <AYC>
Directional
valve (OFF)
To clutch
<Right side>
To clutch
<Left side>
From proportional valve
<AYC>
Directional valve
(Right side: ON)
To clutch
<Right side>
To clutch
<Left side>
POWER TRAIN - ACD and AYC
2-20
ELECTRONIC CONTROL SYSTEM
THROTTLE POSITION SENSOR
For detecting the throttle valve opening angle. Also used as throttle position sensor for engine control.
LONGITUDINAL G SENSOR/LATERAL G SENSOR
The longitudinal G sensor are sensors detecting the acceleration in the longitudinal directions of the
vehicle, and are basically the same as those used conventionally.
The lateral G sensor is used for detecting the acceleration along the sides of the vehicle by changing
the installing direction by 90° . The same sensor as the longitudinal G sensor is used.
G-sensor output characteristics
Output voltage (V)
Acceleration speed
(G)
Deceleration speed
(G)
1.0
0
1.0
1.0
1.5
1.5
1.5
2.5
3.5
4.0
Parking brake lever
Lateral G sensor
Longitudinal
G sensor
STEERING WHEEL SENSOR
The steering wheel sensor is installed at the steering column, and is used to output steer angles to
the 4WD-ECU as signals.
It is composed of the slit plate which rotates according to the movements of the handle and a three-set
photointerruptor. The slit plate and photointerruptor have a sealed integrated structure to prevent the
invasion of foreign particles as well as misoperations by external light. To detect malfunctions of the
sensor output circuit, it is equipped with a zener diode for detecting disconnections parallel to the
phototransistor.
The ECU calculates the steering angle by reading the signals of the steering wheel sensor after every
certain period of time and calculating the total of the ST-1 signal and ST-2 signal.
The steering angle is obtained by taking the neutral position (ST-N output is L center) as 0° , and if
there are changes, the steering angle is added with 2° for right and -2° for left. The output of the
photointerruptor becomes L (low) when light passes through and H (high) when obstructed.
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