2, the Common Rail

Common Rail will be for the provision of high-pressure fuel pumps assigned to each injector, the pressure has been for the role of ECD-U2 system for the track shown in Figure 4. It should cut the volume of the high-pressure oil pump pressure fluctuations and each injector fuel injection process caused by the pressure shocks, high-pressure oil to track fluctuations in the pressure control in under 5 Mpa. But its volume is not too big so as to ensure that there is sufficient pressure common rail speed response to fast-track the status of the diesel engine for change. ECD-U2's high-pressure pump system the largest circulation for the supply of 600 mm3, the volume of 94,000 common rail mm3.

High Pressure Common Rail also installed tube pressure sensors, flow buffers (current limit) and pressure limiter. ECU pressure sensor to provide high-pressure oil-track pressure signal; flow buffers (current limit) guarantee in a fuel injector leakage failure to cut off the supply to the injector, and reduce common-rail and high pressure in the pipeline the pressure fluctuations; pressure on the high-voltage limiter ensure that the oil pressure in the event of abnormal rail, rapid rail will be in the high pressure oil to put pressure on China.

From the above analysis that, precision design of the High Pressure Common Rail for determining the volume and shape of the diesel engine is not easy.