Egr Valve - wsm M108S Workshop Manual

M108S, WSM

[2] EGR VALVE

The motor incorporated in the EGR valve is a brush type DC motor (magnet rotating type brush motor) having the
commutator which determines the power distribution pattern in accordance with rotation of the magnet, and is driven
by switching over the conducting pattern of the coil that is arranged at the circumference. By adopting the DC motor,
the rapid response and high driving force under the condition of large pressure difference is assured.
EGR Valve Lift Sensor
The opening position detecting method of this EGR
valve is used for detecting the movement of the motor
shaft by means of the contact-type position sensor. The
motor shaft engages with the female screw inside the
rotating magnet, and it performs amplification of motor
torque and conversion to translation motion by means of
the screw type speed reduction mechanism.
(1) Terminal Vcc
(2) Terminal GND
(3) Terminal Vout
(4) Terminal EGR DC Motor −
(5) Terminal EGR DC Motor +
(6) Exhaust Gas Flow
(7) Output Voltage
1-M26
ENGINE
(1) Position Sensor
(2) Brush
(3) Circuit Sensor
(4) Commutator
(5) Motor Exterior
(6) Poki Poki Core
(7) Rotor
(8) Bearing
(9) Magnet
(10) Washer
(11) Boss
(12) Shaft
(13) Assist Spring
(14) Spring Holder
(15) Spring Holder
(16) Spring
(17) Housing
(18) Bush
(19) Filter
(20) Valve Assembly
(21) Valve Sheet
W1020740
A : Exhaust Gas Flow-Output
Voltage Characteristic
B : Stroke (10 mm (0.39 in.))
W1020993
KiSC issued 05, 2012 A