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8/6/2019 Engine Akl
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D375A-5 Electronic Training Part 1
Structure & Function Overview
Ayman Akl
D375A-5
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Contents� Sensors Types
� Engine electronic control
� HPI Engine control system
� PCCS (Palm command control system)
� Transmission and steering Control systems� Monitor system
� Special function of EMMS
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Sensor typesThe signal from the sensors are input to the panel directly .either side of a sensor contact
type is always connected to the chassis ground
Name of sensor Type of sensor When normal When abnormal
Engine oil pressure Contact OFF (open) ON (closed)
Engine water Temperature Resistor __ __
Fuel level Resistor __ __
Torque converter oil temperature Resistor __ __
Hydraulic oil temperature Contact ON (closed) OFF (open)
Radiator water level Contact ON (closed) OFF (open)
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If the engine oil pressure is the same or higher
than the specif ied pressure , it is OF F (open contacts)
and if the pressure is below the specif ied pressure
it is ON ( closed contacts)
(open ) (closed)
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(CLOSED)
In the normal time switch is On ( closed contacts)
In the Up normal time switch is OFF (open contacts)
(open)
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When cooling water drops below the specified
level float goes down and sensor goes off
(closed) (open)
In the normal time switch is On ( closed contacts)
In the Up normal time switch is OFF (open contacts)
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Move up and down of the f loat according to the f uel level
Will actuates signals , sends to the panel
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The Decelerator potentiometer moved according to decelerator pedal actuation
This will generate a variable voltage signal between contact B&C send to the engine control
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Engine Electronic Control
Fuel Cooler Fuel Cooler
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The Throttle signal of the throttle
Dial enters the steering controller
And the transmission controller
And is processed together with
Another information ,then sent to
The engine controller as a throttle
Command .
The engine controller controls the
Control valve unit and the fuelPump in accordance with the
Throttle command
Engine Control
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Engine control System
The engine controller receives theManual signal of the second throttle
(decelerator pedal) and the third throttle
signal .
The third throttle control signal includes the
following:-
1-Frist throttle signal ( Dial signal)
2-SSC (Shoe slip control) control) signal
3-Auto decelerators (F3,R3,R2) signal
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*The Steering controller selects the lowest
engine speed from information 1,2,3 andSends it to the engine controller as a third
Throttle.
*The information of the engine controller
is used commonly by the all controllers through
networks for the optimum control of the
Engine and the machine body.
*The automatic decelerator function sets the
engine speed to 1000 rpm temporarily when
the travel direction is changed from F3,R3 or
R2( To protect the transmission clutch).
Engine control System
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HPI Engine Control SystemHPI is an abbreviation of high pressure injection
*The signals detected by various sensors
are input to the engine controller.
*The input signals are operated arithmetically by the controller
signal is issued to each Actuator and controls a fuel injection level
and fuel injection timing .
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Injector
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HPI FUEL Injection system
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HPI SensorsHPI is an abbreviation of high pressure injection
EngineController
Sensors
Sensors
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Item Function Location
Atmospheric pressure sensor Detects the atmospheric pressure Installed to the control valve unit
Boost pressure sensor Detects the turbocharger boost pressure( intake pressure) Installed to the intake manifold
Intake air temperature sensor Detects the intake air temperature Installed to the intake manifoldOil pressure sensor Detects the oil pressure in the lubrication circuits Installed to the cylinder block
Fuel temperature sensor Detects the fuel pressure supplied f rom the fuel pump Instal led to the control valve unit
Cooling water temperature
sensor Detects the temperature of the cooling water Installed to the thermostat housing
Engine speed sensor Detects the speed of the flywheel Installed to the flywheel housing
Fuel pump pressure sensor Detects the discharge pressure of the fuel pump Installed to the fuel pump
Fuel rail pressure sensor Detects the pressure of the fuel rail( fuel injection amount circuit) Installed to the control valve unit
Timing rail pressure sensor Detects the pressure of the timing rail( fuel injection timing circuit) Installed to the control valve unit
Throttle sensor Detects the angle of the accelerator on the machine Installed to the control valve unit
Engine controller It controls the overall system Installed to the control valve unit
Fuel pump actuator Control the output pressure of the fuel pump Installed to the fuel pump
Fuel shut-off valve Control the operation or the stop of the fuel supply circuit Installed to the control valve unit
Fuel rail actuator
Receive the output signal from the controller and adjusts the
pressure of the fuel rail (fuel injection amount circuit) to control thefuel injection amount Installed to the control valve unit
Timing rail actuator
Receive the output signal from the controller and adjusts the
pressure of the timing rail (fuel injection timing circuit) to controlthe fuel injection timing Installed to the control valve unit
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Fuel dial
RH.steeringLH.steering
FWDREV
N
SHIFT UP BUTTON
SHIFT DOWN BUTTON
N
D375A-5
PCCS Lever
PCCS Lever (Palm Command Control System)
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Transmission Control
Saf ety lever
Saf ety switch
Engine does not start unless saf ety lever in Lock 2
position
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Transmission ECMVTransmission ECMV
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PCCS
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Steering ,Brake Control
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Steering ,Brake Control
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Steering ECMV
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Monitor System
*The monitor system monitors the
machine condition with the sensors
installed to various parts of the machine
and processes and displays the obtained
information the panel Quickly to notify
the operator of the machine Condition.
*The main display sections and functions
of the panel are as follows:-
1-Monitor unit which turns on the alarmwhen the machines has a trouble.
2-Function of displaying error codes .
3-Function of monitoring the current and
Voltage of the sensors solenoid.
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Monitor System*In the monitor panel , there are various
mode selector switches of the SSC which are
Used to operate the machine control system.
*The monitor panel has function of displaying
Data and functions of displaying data and
selecting the SSC mode.
*The CPU (Central Processing Unit) in itProcesses ,displays, and outputs the
information. The display unit is LCD (liquid
Crystal Display ) and the Switches are seat
switches.
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Monitor Panel
1 Display plate (speed range display) 8 Power train oil temp. caution lamp
2 Power Train temp.gauge 9 Hydraulic oil temp. caution lamp
3 Engine water temp.gauge 10 Preheat pilot lamp
4 Charge lamp 11 Dual tilt display lamp
5 Fuel level caution lamp 12 Radiator water level check lamp
6 Engine oil pressure caution 13 Fuel gauge
7 Engine water temp.caution lamp 14 Service meter
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Monitor Panel
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Special function of the Monitor Panel EMMSEMMS : Equipment Management Monitoring System
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If the user code indicates a serious problems occurs , the warning lamp f lashes and alarm buzzer sounds at same time.
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Details see 375A-5 shop manual page 20-161
MonitoringMode
Monitor singles coming f rom sensors to the panel
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Details see 375A-5 shop manual page 20-172
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Details see 375A-5 shop manual page 20-192
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Engine oil pressure sensor (3-dimensional drawing)
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Engine oil pressure sensor ( M circuit diagram ,K-3)
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Service code EC135 (Abnormal high level engine oil pressure )
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Troubleshooting when service code is display
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Troubleshooting of electrical system (E-mode)
Details see 375A-5 shop manual page 20-601
Troubleshooting of hydraulic and mechanical system
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Troubleshooting of hydraulic and mechanical system
(H-mode)
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Troubleshooting of the engine body (S-mode)