izuzu 4hk1.PDF

B. Comparison to the Conventional System
Common Rail System

In-line, VE Pump
High-pressure Pipe

Rail

Momentary High Pressure
Timer

TWV
Nozzle

Supply Pump
Usually High Pressure
Delivery Valve

Governor
System

In-line Pump
Feed Pump SCV (Suction Control Valve)

Injector
Fuel Tank
VE Pump
Injection Quantity Control

Pump (Governor)

Engine ECU, Injector (TWV)*1

Injection Timing Control
Rising Pressure
Distributor

Pump (Timer)

Engine ECU, Injector (TWV)*1
Engine ECU, Supply Pump

Injection Pressure Control

Pump
Pump
Dependent upon Speed and Injection Quantity

Engine ECU, Rail

Engine ECU, Supply Pump (SCV)*2
*1 TWV: Two Way Valve *2 SCV Suction Control Valve

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QD2341E