injection pump hmc1
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Mechanical Injection pump
Conventional (VE) Type Injection Pump System
Construction
Altitude
Compensator
Fly weight
Governor
Full load
adjusting
screw
Control
lever
Fuel cut
solenoid
valve
Drive disc
Plunger
spring
Timer
Control
Injection Presser
110~140 bar
In traditional diesel engines the pump is driven
by the engine, and it’s function is to each
injector and to regulate there opening to control
engine speed.
Injection amount to control engine speed are
controlled by mechanical or electrical governor
system located inside of injection pump, it
controlled by accelerator pedal with cable or
wiring (in case of electric governor system.
Governor System
Governor & Fuel control system
Governor spring
Fly weight
Control lever
Idling spring
Full load adjusting
screw
Tension lever
Regulating
Valve
Fuel cut
solenoid
valve
Out let
Drive shaft
Feed pump
( 90˚
turned)
Gear
Drive disc
Delivery valve
Control sleeve
Plunger spring
Cam Disc
Plunger operation
4
2
How to control
The Pressure is generated by a plunger.
3
1
Plungers are driven by Drive disc cams.
10
Fuel Control
Minimum injection
Half injection
Full injection
Governor system
Governor spring
Mechanical type Injection
Pump
Fly weight
Idling spring
Full load adjusting
screw
Control lever
Tension lever
Regulating Valve
Fuel cut solenoid
valve
Out let
Drive shaft
Feed pump
( 90˚ turned)
Delivery valve
Control sleeve
Gear
Plunger spring
Drive disc
Injection amount to control engine speed are controlled by
mechanical governor system located inside of injection
pump, it controlled by accelerator pedal with cable.
Cam Disc
Fuel control by control lever
Governor spring
1) Fuel control by control lever
Fly weight
Idling spring
Full load adjusting screw
Control lever
Tension lever
Fuel cut solenoid
valve
Regulating Valve
Out let
Drive shaft
Feed pump
( 90˚ turned)
Delivery valve
Control sleeve
Gear
Plunger spring
Drive disc
Cam Disc
The amount of injections are changed by position of control
sleeve, it is controlled by fuel control lever through the tension
lever.
Fuel control by Governor
Governor spring
2) Fuel control by Governor
Fly weight
Idling spring
Full load adjusting screw
Control lever
Tension lever
Fuel cut solenoid
valve
Regulating Valve
#2 Governor
Out let
Drive shaft
Feed pump
( 90˚ turned)
Delivery valve
Control sleeve
Gear
Plunger spring
Drive disc
Cam Disc
When the engine rpm is over the limit, the Fly weights are
expended by centrifugal force and tension lever is moved back
by push load than the control sleeves are moved back too, so fuel
injection amount are decreased so it’s make reduce the engine
rpm.
Fuel cut control valve
Governor spring
3) Fuel Cut Control Valve
Fly weight
Idling spring
Full load adjusting screw
Control lever
Tension lever
Fuel cut solenoid
valve
Regulating Valve
#2 Governor
Out let
Drive shaft
Feed pump
( 90˚ turned)
Delivery valve
Control sleeve
Gear
Plunger spring
Drive disc
Cam Disc
When you turn on the Ignition Key, the fuel cut solenoid plungers
are fuelled up by magnetic force due to energized solenoid coil.
Timing control system
Governor spring
4) Timing control system
Fly weight
Idling spring
Full load adjusting screw
Control lever
Tension lever
Fuel cut solenoid
valve
Regulating Valve
#2 Governor
Out let
Drive shaft
Feed pump
( 90˚ turned)
Delivery valve
Control sleeve
Gear
Plunger spring
Drive disc
rpm
Cam Disc
Pressure
COVEC-F System
COVEC-F
COVEC-F fuel injection system (Computed VE Control system - Full)
- Improved Power Performance
- Increased Comfort
- Decreased Smoke at sudden Acceleration
- Additional Devices Unnecessary
System Overview
Block Diagram
Construction
Fuel temperature sensor
GE actuator
rol sleeve position sensor
Cont
Timing Control
Solenoid Valve
Pump Speed
Sensor
Compensation
resistor
Electronic
Governor
Timing position
Sensor
GE Actuator
Acceleration
Poison
Sensor
Current
2
1
Control sleeve
position sensor
0
Control lever
GE actuator
Ball Pin
Regulating Valve
Fuel cut solenoid
valve
Out let
Drive shaft
Feed pump
( 90˚ turned)
PE sensor
Delivery valve
Control sleeve
Gear
Plunger spring
Drive disc
Cam Disc
GE Actuator
GE Actuator
Symptoms :
TCV
Symptoms :
TPS
Symptoms :
NP Sensor
Symptoms :
NP Sensor Signal
CKP
NP
Symptoms :
Q Compensation Resistance
Symptoms :
