Abstract: Using electronic control to lower fuel exhaustion and emission is one of the problems to be dealt with in the development of the engine and the fuel injection system. The special feature of the construction, the working mode and the control principle of a new electronically controlled VE distributor pump are set forth in this paper. The new electronically controlled VE pump and a mechanical VE pump are respectively used in the engine JX493Q1. Experimental results show that the electronically controlled VE pump has an advantage over the mechanical VE pump both in power and economic performance. Viewed from its full-load-speed characteristic, the engine is more adaptable to load change when equipped with the electronically controlled VE pump than with the mechanical VE pump.

Key words: fuel injection system, engine, characteristic, electronic control