1. Common-rail fuel injection system comprises of low-pressure oil line, high-pressure oil line, information collecting part and control & executive component. Low-pressure oil line includes oil tank, fuel coarse filter with manual fuel pump, low-pressure fuel feed pump and fuel fine filter.

High-pressure oil line includes high-pressure oil pump, common-rail pipe and fuel injector.

Information collecting part is made up of crankshaft position sensor, camshaft position sensor, electronic throttle, water temperature sensor, air intake pressure temperature sensor, oil pressure temperature sensor, common-rail pressure sensor. Control & executive component is composed

of engine control unit (ECU), fuel metering valve and solenoid valve of fuel injector. The oil return pipe of system provides the way for the redundant fuel that flows through the high-pressure oil pump and fuel injector. And the fuel flowing from the pressure limiting valve due to that the common-rail pressure exceeds the defined pressure can also flow back to the oil tank through the oil return pipe.

System Part Drawing