C) common rail technology development stage

Diesel Engine Electronic Control abroad in the high-pressure common-rail fuel injection system of research carried out in the earlier and more in-depth, there are several common-rail system has been put into production, and a vehicle matching applications. Japan's Denso Corporation of ECD-U2 system is electronically controlled high-pressure common-rail fuel injection system of a typical representative of the system not only to achieve �� jet, but also to achieve pre-jet spray and Xue Xing.

The development of common rail injection generally has experienced three stages, as shown in table 1.
From Table 1 can be seen in: common-rail injection at the maximum injection pressure continuously improve, so improving the quality of the jet is of important significance. The higher the pressure, the better the atomization of fuel, the smaller the particles more evenly, burning more fully, economy, power and emissions of all good, but the injection system requirements are also higher; increasing the number of jet can be achieved Engine combustion and emissions to meet the many jet, can be controlled at different stages of combustion of fuel injection and injection rate, burning more fully, the thermal efficiency improved to a minimum of stability on the jet, each of the three stages of the decline in the volume of spray This shows when each jet can spray more uniform, more detailed, more fuel injection and just off oil, responsive, response characteristics, and this is conducive to combustion, reducing coke production.