uel injection system for diesel engine

摘要

A fuel injection system for a diesel engine is provided with a needle-lift-suppressing type fuel injection nozzle such as the central plunger type pintle fuel injection nozzle which has a valve needle adapted to be lifted under fuel pressure fed from a fuel injection pump to increase the effective spray area with increase in the lift of the valve needle and a needle-lift-suppressing means which limits the lift of the valve needle to a pre-lift of a predetermined amount at low load and/or low speed, and a starting detecting means for detecting starting of the engine, said needle-lift-suppressing means being arranged to permit lift of the valve needle beyond said pre-lift irrespective of the engine load and engine speed when the engine is started.