sistema-heui-caterpillar

Service TrainingMALAGA

Large Track Type Tractors

AdolfoMay 1997

1 ENGINE CONTROL 3400 HEUI

1. Components Layout2. Operation3. Testing & Adjusting

CH

AP

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EU

I

HE

UI F

UE

L SY

ST

EM


1-2P

age:

High PressureOil Pump

HIGH PRESSURE OIL MANIFOLD

Fuel Return Line

ECM

FuelFilter

FuelTransPump

Fuel Tank

OilPump

OilSump

OilCooler

OilFilter

VehicleSystem

Engine System

RegulatorPressureControlValve

40 to 210 BAR

LOW PRESSURE 3 BAR

CHAPTER : 3400 HEUI

HEUI FUEL SYSTEM


1-3Page:

The electronic components in the HEUI fuel system are very similar to those used in other EUI systems.However, in the HEUI system, the injectors are not actuated by a camshaft

The seven major types of components in the HEUI fuel system are:

• Hydraulic Supply Pump Group containing:

- High pressure hydraulic pump

- Pump control valve

- Transfer pump

• ECM

• Throttle Control

• Speed/Timing Sensor

• Injector

• Temperature Sensor

• Pressure Sensor

CHAPTER : 3400 HEUI

INJECTOR COMPONENTS


1-4Page:

BARREL

PISTON

VALVE

FUEL INLETCHECK VALVE

PIN

SPACER

SLEEVE

VALVE BODY

CHECK

SHIM

ADAPTER

SPACER

ARMATURE

SOLENOID

WASHER

PLUNGER

SLEEVE

LOWER FUEL SEAL

UPPER FUEL SEAL

NOZZLE

CHAPTER : 3400 HEUI

INJECTION CYCLE


1-5Page:

CHAPTER : 3400 HEUI

POPPET VALVE OPEN


1-6Page:

ARMATURESCREW

POPPETSPRING

CHAPTER : 3400 HEUI

DRAIN CYCLE


1-7Page:

CHAPTER : 3400 HEUI

POPPET VALVE CLOSED


1-8Page:

INLETVALVE SEAT

SOLENOID

POPPET VALVE

ARMATURE

EXHAUSTVALVE SEAT

CHAPTER : 3400 HEUI

NOZZLE GROUP


1-9Page:

FUEL ATOMIZATION

NOZZLE GROUP

CHECK VALVE

REVERSE FLOWCHECK VALVE

CHAPTER : 3400 HEUI

PRIME RATE SHAPING


1-10Page:

CROSS SECTIONOF PLUNGER

START OF INJECTION PRESSURE DROP

INJECTIONRATE

START OFINJECTION DURATION

FINALPRESSURE INCREASE

TIME (MILLISECONDS)

END OFINJECTION

CHAPTER : 3400 HEUI

VENTING INTERNAL LEAKS


1-11Page:

During the normal injection cycle, the pressure of the oil supplied to the top of the intensifierpiston can increase to 22800 kPa (3300 psi). A seal is installed to minimize leakage past thepiston.

Some oil which is necessary for lubrication of the intensifier piston may pass the seal and settlemomentarily below the piston.

Also, a small amount of fuel may leak past the plunger and barrel. This fuel will settlemomentarily in the cavity below the intensifier piston.

If the fluids which accumulate below the piston are not vented, a hydraulic lock could occur. Asthe piston moves down, the fuel is ejected past the barrel ball check valve to the low pressureinlet. The check valve then closes during the plunger and piston upstroke.

INTENSIFIERPISTON SEAL

BARREL

INTENSIFIERPISTON

VENTINGCHECK VALVE

CHAPTER : 3400 HEUI

INJECTOR CHECK VALVES


1-12Page:

BARREL GROUP NOZZLE GROUPFUEL INLETCHECK VALVE

NOZZLECHECK VALVE

FUELATOMIZATION

VENTINGCHECK VALVE

REVERSE FLOWCHECK VALVE

The Fuel Inlet Check Valveallows fuel to fill the barrel below the plunger, but closes as the plungermoves down and pressure increases.

The Venting Check Valvevents fluids from below the intensifier piston.

The Reverse Flow Check Valveprevents combustion gasses from flowing back through the injectorfrom the nozzle.

The Nozzle Check Valvecontrols valve opening pressure by preventing the flow of fuel through thenozzle holes until sufficient pressure is available to lift the valve from its seat

CHAPTER : 3400 HEUI

PRESSURE CONTROL


1-13Page:

IDLE

INJE

CT

ION

PR

ES

SU

RE

MECHANICALLY ACTUATEDFUEL SYSTEM

H E U I

ENGINE SPEED

CH

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LOW

PR

ES

SU

RE

OIL (H

YD

R.) S

UP

PLY


1-14P

age:

TO LUBESYSTEM

FUELTRANSFER

PUMP

PUMPCONTROL

VALVE

OILFILTER

OILCOOLER

HEUI

HEUI

OILSUMP

HYDRAULICPRESSURE

SENSOR

HYDRAULICTEMPERATURE

SENSOR

OIL PRESSURESENSOR

ECM

COOL DOWNCIRCUIT

FUEL TANK

FUELTEMPERATURE

SENSOR

PRESSUREREGULATING

VALVE

SECONDARYFUEL

FILTERPRIMARY

FUEL FILTERWATER

SEPARATOR

LUBE OILPUMP

COLD STARTOIL

RESERVOIR

HYDRAULICSUPPLYPUMP

GROUP

FLUID MANIFOLDHYDRAULIC PASSAGE

FLUID MANIFOLDHYDRAULIC PASSAGE

CHAPTER : 3400 HEUI

HIGH PRESSURE HYDRAULICS


1-15Page:

TO

LU

BE

SY

ST

EM

FU

EL

TR

AN

SF

ER

PU

MP

PU

MP

CO

NT

RO

LV

ALV

E

OIL

FIL

TE

R OIL

CO

OLE

R

HE

UI

HE

UI

OIL

SU

MP

HY

DR

AU

LIC

PR

ES

SU

RE

SE

NS

OR

HY

DR

AU

LIC

TE

MP

ER

AT

UR

ES

EN

SO

R

OIL

PR

ES

SU

RE

SE

NS

OR

HY

DR

AU

LIC

SU

PP

LYP

UM

PG

RO

UP

CO

OL

DO

WN

CIR

CU

ITF

UE

LT

EM

PE

RA

TU

RE

SE

NS

OR

EC

M

FU

EL

TA

NK

PR

ES

SU

RE

RE

GU

LAT

ING

VA

LVE

SE

CO

ND

AR

YF

UE

LF

ILT

ER

PR

IMA

RY

FU

EL

FIL

TE

RW

AT

ER

SE

PA

RA

TO

R

LUB

E O

ILP

UM

P

CO

LD S

TA

RT

OIL

RE

SE

RV

OIR

FLU

ID M

AN

IFO

LDH

YD

RA

ULI

C P

AS

SA

GE

FLU

ID M

AN

IFO

LDH

YD

RA

ULI

C P

AS

SA

GE

CHAPTER : 3400 HEUI

REVERSE FLOW CHECK VALVE


1-16Page:

CH

EC

KF

ITT

ING

SP

RIN

GV

ALV

E B

LOC

KS

EA

TFR

OM

PU

MP

TO

INJE

CT

OR

S

SE

AT

(EN

D V

IEW

)

CHAPTER : 3400 HEUI

REVERSE FLOW CHECK VALVE


1-17Page:

The hydraulic supply pump group has two outlet ports, each connected by steel tubes to a hydraulicsupply manifold. An integral reverse flow check valve is located in each outlet port.

This view shows that pressure surges travelling back from the injectors toward the pump will cause thecheck valve to close and block any interference between the banks. In normal operation, the valve willoscillate at high frequency as it blocks the pressure surges.

The valve check fits loosely on the shaft to allow oil flow from the reservoir during the cooling process.

If the check valves were not in the system, pressure surges between the banks would cause erraticoperation of the injectors by adversely affecting timing. The pressure surge causes the poppet valves toopen prematurely. This condition would start

fuel injection earlier than normal, thereby advancing the timing.

CHAPTER : 3400 HEUI

LOW PRESSURE FUEL SUPPLY


1-18Page:

TO L

UBE

SYST

EM

FUEL

TRAN

SFER

PUM

PPR

ESSU

RE

REG

ULA

TIN

GVA

LVE

PUM

PC

ON

TRO

LVA

LVE

OIL

FILT

ER OIL

CO

OLE

R

LUBE

OIL P

UM

P

HEU

I

HEU

I

OIL

SUM

P

HYD

RAU

LIC

PRES

SUR

ESE

NSO

R

HYD

RAU

LIC

TEM

PER

ATU

RE

SEN

SOR

OIL

PR

ESSU

RE

SEN

SOR

ECM

CO

OL

DO

WN

CIR

CU

ITFU

ELTE

MPE

RAT

UR

ESE

NSO

R

FUEL

TAN

K

SEC

ON

DAR

YFU

EL F

ILTE

R(2

MIC

RO

N)

PRIM

ARY

FUEL

FIL

TER

WAT

ERSE

PAR

ATO

R

CO

LD S

TAR

TO

ILR

ESER

VOIR

HYD

RAU

LIC

SUPP

LYPU

MP

GR

OU

P

FLU

ID M

ANIF

OLD

HYD

RAU

LIC

PAS

SAG

E

FLU

ID M

ANIF

OLD

HYD

RAU

LIC

PAS

SAG

E

CHAPTER : 3400 HEUI

LOW PRESSURE FUEL SUPPLY


1-19Page:

On a HEUI equipped engine, the lubrication pump has two functions:

1. Provides lubrication to the engine

2. Provides low pressure charge oil to the HEUI hydraulic pump

The engine lubrication pump has been enlarged to provide the required increase in flow.

During normal operation conditions, oil is pressurized between 5000 and 21500 kPa (725 and 3100 psi)by the high pressure hydraulic pump to actuate the injectors.

The pressure regulating valve regulates fuel pressure between 310 and 415 kPa (45 and 60 psi).

The ratio of fuel between combustion and fuel return to the tank is about 1:3 (i.e. four times the volumerequired for combustion is supplied to the system for combustion and injector cooling purposes).

CH

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1-20P

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INJE

CTO

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LUID

FLO

W

LOW PRESSUREFUEL SUPPLY

CYLINDER HEADINJECTOR SLEEVE

FLUID SUPPLYMANIFOLD

INJECTOR

INJECTOR OILADAPTER

JUMPER TUBE

INJECTOR CLAMP

HIGH PRESSUREHYDRAULIC PASSAGE

CYLINDER HEAD

ROCKER ARM BASE

LUBE OIL PASSAGE

CYLINDER BLOCKCOOLANT

METAL WASHER

HIGH PRESSUREHYDRAULIC OIL

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INJE

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LY


1-21P

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FLUID SUPPLYMANIFOLD

INJECTOR

CYLINDERHEAD

LOWER INJECTORO-RING SEAL

UPPER INJECTORO-RING SEAL

METAL-TO- METALCONTACT

LOW PRESSUREFUEL SUPPLY

CYLINDER HEADINJECTOR SLEEVE

UPPER SLEEVEO-RING SEAL

LOWER SLEEVEO-RING SEAL

CH

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1-22P

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PRIMING PORT

ORIFICE

RESERVOIR

SWASHPLATE

TRANSFER PUMP

COMPENSATORVALVE

VALVE BASE

DRAIN PASSAGE

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STA

RT-U

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1-23P

age:

TO LUBESYSTEM

TO RIGHT OILMANIFOLD

TO LEFT OILMANIFOLDCOLD START

RESERVIOR

OIL SUMPPUMP

CONTROLVALVE

LOADSENSINGSPOOL

PRESSURELIMITERSPOOL

PUMPCASE DRAIN

SOLENOID(ENERGIZED)

DISPLACEMENTCONTROL PISTON

CHECK VALVE

SUPPLY PUMP

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RT-U

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1-24P

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PRESSURE LIMITER SPOOL

CHECK VALVE

PUMP CONTROLVALVE

DRAIN ORIFICE

ORIFICE

TOCASEDRAIN

LOAD SENSING SPOOL

FROM DISPLACEMENTCONTROL PISTON

REVERSE FLOWCHECK VALVES

TO CASE DRAIN

CHAPTER : 3400 HEUI

START-UP


1-25Page:

The displacement of the pump is controlled to maintain the desired operating pressure at the flow raterequired by the injectors. The displacement is regulated by an electro-hydraulic control.

Displacement of the pump is varied by pivoting the swashplate from 0 degrees to a maximum angle of 15.5 degrees. When the engine is not running, the swashplate is at themaximum angle. During operation, the displacement control piston adjusts the swashplate position tomeet the system flow demand.

During initial cranking, the swashplate is at full displacement until the supply pressure increases to 6200kPa (900 psi). The spring at the end of the load sensing spool regulates this pressure. Then, thespecification programmed into the ECM for normal cranking will override this pressure. Until this point,the control valve solenoid is fully energized for the pressure increase.

During START-UP, pressure from the pump enters the compensator assembly. The Pump Control Valveis energized for quick pressure build-up.

Pressure is felt at both ends of the Load Sensing Spool. The spool is shifted to the right and oil from theDisplacement Control Piston is vented to case drain. The swashplate is at maximum angle.

The drain orifice below the Pump Control Valve provides a small amount of restriction to improve valvestability

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1-26P

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TO LUBESYSTEM



RESERVIOR

OIL SUMPPUMP

CONTROLVALVE

LOADSENSINGSPOOL


PUMPCASE DRAIN

SOLENOID(DE-ENERGIZED)

CHECK VALVE


SUPPLY PUMP

CH

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1-27P

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PUMPCONTROL VALVE

DRAIN ORIFICE

TO DISPLACEMENT CONTROL PISTON

TO CASE DRAIN

PRESSURELIMITER SPOOL

CHECK VALVE

ORIFICE

LOAD SENSINGSPOOL

CHAPTER : 3400 HEUI

DESTROKE


1-28Page:

After the engine starts and pressure increases, the ECM will signal the control valve to match the actualwith the desired pressure by momentarily de-energizing and then regulating the current flow to the pumpcontrol valve solenoid.

The decrease in current applied to the pump control valve solenoid lowers the pressure required toinitiate flow through the pump control valve. This lower cracking pressure on the pump control valvecreates a force imbalance on the load sensing spool, causing the spool to move toward the spring end ofthe compensator. This spool motion connects the displacement control piston to pump output flow,allowing the swashplate to decrease the displacement of the pump. The decreased displacement lowersthe pump output to the pressure level required by the ECM.

During DESTROKE, the ECM momentarily de-energizes the Pump Control Valve causing a pressuredrop in the spring chamber of the Load Sensing Spool.

Unbalanced pressures force the spool to the left, allowing the oil to enter the Displacement ControlPiston and move the swashplate toward minimum angle.

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I

UP

ST

RO

KE


1-29P

age:

TO LUBESYSTEM



RESERVIOR

OIL SUMPPUMP

CONTROLVALVE

LOADSENSINGSPOOL


PUMPCASE DRAIN

SOLENOID(ENERGIZED)

CHECK VALVE


SUPPLY PUMP

CH

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I

UP

ST

RO

KE


1-30P

age:

PRESSURELIMITER SPOOL

CHECK VALVE

ORIFICE

LOAD SENSINGSPOOL

PUMPCONTROL VALVE

DRAIN ORIFICE

FROMDISPLACEMENT

CONTROL PISTON

TO CASE DRAIN

CHAPTER : 3400 HEUI

UPSTROKE


1-31Page:

As the load on the engine increases and higher pressure is required, the ECM will signal the controlvalve to increase pressure by increasing the current flow to the pump control valve solenoid.

The increase in current applied to the pump control valve solenoid raises the pressure setting of thepump control valve. This higher pressure at the pump control valve creates a force imbalance on theload sensing spool, causing the spool to move toward the supply signal line end of the compensator.This spool motion vents the displacement control piston to case drain, allowing the spring to move theswashplate to increase the displacement of the pump. The increased displacement raises the pumpoutput to the desired pressure level required by the ECM.

As the load is applied to the engine, the ECM increases current to the Pump Control Valve.

Pressure is felt at both ends of the Load Sensing Spool. The spool moves to the right (due to springforce) and oil from the Displacement Control Piston is vented to case drain, which allows the swashplateto momentarily go to maximum angle and build pressure quickly.

CH

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I

PR

ES

SU

RE

LIMIT

ER

OP

ER

ATIO

N


1-32P

age:

TO LUBESYSTEM



RESERVIOR

OIL SUMPPUMP

CONTROLVALVE

LOADSENSINGSPOOL


PUMPCASE DRAIN

SOLENOID(DE-ENERGIZED)


SUPPLY PUMP

PLUGGEDORIFICE

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PR

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SU

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LIMIT

ER

OP

ER

ATIO

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1-33P

age:

PRESSURE LIMITERSPOOL

CHECK VALVE

ORIFICE

LOAD SENSINGSPOOL

PUMPCONTROL VALVE

DRAIN ORIFICE

TODISPLACEMENT

CONTROL PISTON

TO CASE DRAIN

RESTRICTION

CHAPTER : 3400 HEUI

PRESSURE LIMITER OPERATION


1-34Page:

If the load sensing spool or pump control valve sticks or otherwise malfunctions to create higher thandesired operating pressures, the maximum pressure limiter spool is utilized. In this schematic, a pluggedorifice is simulated. (This example represents an actual condition which was caused by debris beingintroduced during a field replacement of the compensator valve.)

The Pressure Limiter Spool directs pump outlet flow to the displacement control piston and reduces thestroke of the pump if the system pressure exceeds 25600 kPa (3700 psi).

During these conditions, the pump will develop 24800 to 25600 kPa (3600 to 3700 psi) maximumpressure, regardless of the desired hydraulic pressure. The Check Engine Lamp will be ON, indicating afault.

A Pump Control Valve Test will verify the control valve operation. This test enables the technician tomanually ramp the pressure up and down using the ET service tool. This procedure will also be usefulwhen evaluating the condition of the hydraulic system.

If the supply pressure exceeds 25600 kPa (3700 psi), the force acts on the Pressure Limiter Spool andshifts it to the left. This movement compresses the spring and allows oil to unseat the check valve andpressurize the displacement control piston. The swashplate moves to minimum angle to decrease flowand limit system pressure.

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PU

MP

CO

NT

RO

L VALV

E


1-35P

age:

ADAPTER CAGE

RINGSHELLPIN

STATOR

SEAL SEATPOPPETVALVE

SOLENOIDARMATURE

STOP

TOCASE DRAIN

FROM LOADSENSING SPOOL

VALVE

NO CURRENT FLOW

COILASSEMBLY

EDGEFILTER

SPRINGRETAINER

VALVEBLOCK

CH

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PU

MP

CO

NT

RO

L VALV

E


1-36P

age:

ADAPTER CAGE

RINGSHELLPIN

STATOR

SEAL SEATPOPPETVALVE

SOLENOIDARMATURE

STOP

COILASSEMBLY

EDGEFILTER

SPRINGRETAINER

FROM LOADSENSING SPOOL

VALVE

VALVEBLOCK

HIGH CURRENT FLOW

TOCASE DRAIN

CH

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CO

MP

ON

EN

TS

DIA

GR

AM


1-37P

age:

ADEM IIELECTRONIC

CONTROLMODULE

(ECM) GROUNDBOLT

15 AMPBREAKER

MAINPOWER RELAY KEY

SWITCH

TURBO OUTLET PRESS. SENSOR

SECONDARYSPEED/TIMING SENSOR

PRIMARYSPEED/TIMING SENSOR

HYDRAULICPRESSURE SENSOR

24 V

MACHINEINTERFACE

CONNECTOR

ENGINEHARNESS

PUMPCONTROL VALVE

COOLANT TEMP. SENSOR

ATMOSPHERIC PRESS. SENSOR

OIL PRESSURE SENSOR

HYDRAULIC TEMP. SENSOR

FUEL TEMPERATURE SENSOR

COOLANT FLOW SWITCH

8 OR 12INJECTORS

TDC SERVICEPROBE ACCESS

INSTRUMENTPANEL

AUTO RETARDER CONTROL

EPTC II TRANSMISSION CONTROL

ELECTRONIC SERVICE TOOL

CAT DATA LINK

FANFAN SPEED SENSOR

FAN CONTROL VALVE

TURBO INLET PRESSURE SENSOR

THROTTLE BACK-UP, ELEVATED LOW IDLE ENABLE,AND GROUND LEVEL SHUTDOWN (2) SWITCHES

THROTTLESENSOR ACCELERATOR

PEDAL

DISCONNECT SWITCH

MACHINEHARNESS

CHAPTER : 3400 HEUI

SENSORS - ANALOG & DIGITAL


1-38Page:

ANALOG SENSORS

- HYDRAULIC PRESSURE

- COOLANT TEMPERATURE

- ATMOSPHERIC PRESSURE

- TURBOCHARGER INLET PRESSURE

- TURBOCHARGER OUTLET PRESSURE

- LUB. OIL PRESSURE

- HYDRAULIC TEMPERATURE

- FUEL TEMPERATURE

DIGITAL SENSORS

- THROTTLE POSITION

- PUMP CONTROL VALVE SIGNAL

- EXHAUST TEMPERATURE (not installed on machine engines at this time)

CHAPTER : 3400 HEUI

SYSTEM POWER SUPPLIES


1-39Page:

The HEUI system has six power supplies with various voltages as shown.

EXTERNAL POWER SUPPLY

ECM power supply 24 Volts

INTERNAL POWER SUPPLIES

Speed/Timing Sensor power supply 12.5 Volts

Injector power supply 105 Volts

Analog Sensor power supply 5 Volts

Digital Sensor power supply 8 Volts

Pump Control Valve power supply 0 to 24 Volts

The power supply to the ECM and the system is drawn from the 24-Volt machine battery. The principlecomponents in this circuit are:

- Battery- Key Start Switch- Main Power Relay- 15 Amp Breaker- Ground Bolt- ECM Connector (P1/JI)- Machine Interface Connector (J3/P3)

If the supply voltage exceeds 32.5 Volts or is less than 9.0 Volts, a diagnostic code is logged. (See theTroubleshooting Guide for complete details on voltage event logging.)

NOTE: The ground bolt is the only power supply component mounted on the engine.

CHAPTER : 3400 HEUI

LOGGED EVENTS


1-40Page:

Logged events are abnormal to the operation of the engine (for example: high temperature, low pressureor excessive engine speed). These conditions would not normally be caused by an electronic problem.

Some of the parameters listed in this presentation are used in the ET events list. They are:

- High coolant temperature above 107°C (225°F)

- Loss of coolant flow

- Low (lubrication) oil pressure (according to the oil pressure map)

- Abnormal injection actuation hydraulic pressure (low or high)

- Injection actuation pressure system fault

- User defined shutdown (if installed)

- Air inlet restriction (if installed)

- Engine overspeed histogram

- Low fuel pressure (industrial engine only)

Events are not logged if an electronic fault is detected.

Passwords are required to clear events. This process would normally be performed during an engineoverhaul. At other times, the events would be left as a record of the engine history prior to overhaul time.

CHAPTER : 3400 HEUI

SYSTEM LIMITS & DERATE


1-41Page:

FUEL SYSTEM DERATES

AUTOMATIC ALTITUDE COMPENSATION( Altitude derate)

AUTOMATIC FILTER COMPENSATION( Derate for air filter restriction if installed )

ENGINE WARNING DERATE ( Derates for LOW OIL PRESSURE, HIGH COOLANT TEMP not install in HEUI at the time)

MAXIMUM HORSEPOWER

TORQUE LIMIT ( Determines torque rise characteristics)

FUEL RATIO CONTROL ( Limits fuel until sufficient boost )

COLD MODE ( Limits fuel to control white smoke )

CRANKING FUEL ( Limits fuel during cranking )

FUEL SYSTEM LIMITS

FUEL SYSTEM DERATES

AUTOMATIC ALTITUDE COMPENSATION( Altitude derate)

AUTOMATIC FILTER COMPENSATION ( Derate for air filter restriction if insatalled At 6.25 kPa (30 inc of water) the engine will derate 2% of its power per 1 kPa until a maxi 20% Event is logged if exeeds 30 inch of water )

ENGINE WARNING DERATE ( Derates for LOW OIL PRESSURE , HIGH COOLANT TEMP not installed yet on HEUI)

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TIM

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1-42P

age:

4

3

6

5

7

2

1

8

REF

REF

REF

REF

REF

REF

REF

REF

TDCTDC

TDC

TDCTDC

TDC

TDC

SINGLE50/50 TOOTH

TIMING WHEELROTATION

TDC CYLINDER No. 1

TIMINGCALIBRATIONRANGE ± 10°

PRIMARYSPEED/TIMING

SENSOR

SECONDARYSPEED/TIMING

SENSOR

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I

CR

AN

KIN

G


1-43P

age:

A B C D E F G H

TIMING WHEEL ROTATION

80/20 % 80/20 % 80/20 %80/20 % 50/50%80/20 % 80/20 %

TIMING GEAR TOOTH TABLE

TABLEENTRY

CYLINDERREFERENCE

ABCDEFGH

80 %80 %80 %80 %80 %80 %80 %50 %

NONE IDENTIFIED

PWM DUTYCYCLE

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RN

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ITIO

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1-44P

age:


CYL NO. 3REFERENCE

EDGE

CYL NO. 4TDC

CYL NO. 4REFERENCE

EDGE

CYL NO. 8REFERENCE

EDGE

CYL NO. 3TDC


CYLINDERREFERENCE

80 %80 %80 %80 %80 %80 %80 %50 %

NOCYL NO. 3NONOCYL NO. 4NONOCYL NO. 8

TABLEENTRY

ABCDEFGH

PWM DUTYCYCLE

A B C D E F G H

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I

NO

RM

AL O

PE

RAT

ION


1-45P

age:


PWM DUTYCYCLE

CYLINDERREFERENCE

80 %80 %80 %80 %80 %80 %80 %50 %

NOCYL NO. 3NONOCYL NO. 4NONOCYL NO. 8

CYL NO. 4(REFERENCE)

CYL NO. 4ACTUAL TDC

(CALIBRATED)

62° BTDC (EEPROM)

DES TIMING

NO. 4INJECTION

TABLEENTRY


ABCDEFGH

A B C D E F G H

CYL NO. 3(REFERENCE)

CYL NO. 3ACTUAL TDC

(CALIBRATED)

62° BTDC (EEPROM)

DES TIMING

DELAY NO. 3INJECTION

DELAY

ASSUMEDTDC

ASSUMEDTDC

CH

AP

TE

R : 3400 H

EU

I

TIM

ING

CA

LIBR

ATIO

N


1-46P

age:

REFERENCE EDGE TO TDC DISTANCE

REFERENCEEDGE ASSUMED

CYL. NO. 1 TDCACTUAL

CYL. NO. 1 TDC

TIMINGREFERENCE

OFFSET

MAXIMUM TIMING REFERENCE OFFSET ± 10 DEGREES

TIMING CALIBRATIONSENSOR SIGNAL

TIMINGWHEEL

+10°± 10°

-10°

CH

AP

TE

R : 3400 H

EU

I

INJE

CT

ION

CU

RR

EN

T W

AVE

FO

RM


1-47P

age:

0 1 2 3 4

CU

RR

EN

T F

LOW

TIME (MILLISECONDS)

PULL-IN PEAK CURRENT

HOLD-IN PEAK CURRENT

ONE CYCLE

5

CH

AP

TE

R : 3400 H

EU

I

PO

PP

ET

VALV

E M

OV

EM

EN

T


1-48P

age:

0 1 2 3 4

CU

RR

EN

T F

LOW

TIME (MILLISECONDS)

CURRENT

POPPETLIFT

5

CH

AP

TE

R : 3400 H

EU

I

WAV

EF

OR

M&

RE

SP. C

HA

RA

CT

ER

IST

ICS


1-49P

age:

0 1 2 3 4

CU

RR

EN

T F

LOW

TIME (MILLISECONDS)

CURRENT

POPPETLIFT

INJECTIONRATE

START OFINJECTION

DURATION

5END OF

INJECTION

sistema-heui-caterpillar

Automotive

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