Kubota D1803-CR-E4, Workshop Manual

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5.6.3 Function of EGR valve
The EGR valve regulates recirculation gas volume.
The EGR valve position is detected using the lift
sensor.
The lift sensor is a non contact type sensor made up of
3 ICs (hall switches) with hall elements embedded and
a magnet for position detection.
As the rotor rotates and the magnet for position
detection passes, on/off signals are output from each
hall switch.
Built in microcomputer in the EGR valve input output
signals from each of the hall switches and detect the
valve position.
The valve position detected by the microcomputer is
converted to a CAN signal and transferred to the
engine ECU.
The EGR valve motor is a brushless type DC motor.
Built in microcomputer in the EGR valve controls the
rotor to provide the position specified by the engine
ECU.
Built in microcomputer in the EGR valve input output
signals from each of the hall switches and detect the
valve position.
The microcomputers drive the rotor by turning
energization on/off of coils arranged on the outer
circumference at set timing.
5.6.4 Specification of EGR valve
Cooling method Water cooled
5.7 Reed valve
5.7.1 Outline of reed valve
The reed valve prevents backflow of intake air into the
EGR cooler.
5.7.2 Structure of reed valve
The reed valve is made up of a valve, case, and
stopper.
(1) Valve
(2) Stopper (3) Case
5.7.3 Function of reed valve
The reed valve prevents backflow of intake air into the
EGR cooler while supercharging.
The valve is designed to close during the intake stroke
and open during the exhaust stroke.
4. ENGINE
MECHANISM
5. Exhaust gas recirculation (EGR) system
4-50
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
KiSC issued 12, 2018 A