Abstract: Specified calibration targets were put forward against different operating conditions of the diesel engine:engine starting should be reliable and smooth without over fuel supply, engine idling should be stable with low rpm; under the operating conditions corresponding regulated emission test cycle, the emission levels should be limited strictly; and the diesel engine should have good fuel economy in the whole opeating field. The tests were performed on a diesel engine equipped with a VP37 electronic controlled distribution pump. The effects of pump control parameters on the diesel performance and emissions were investigated experimentally during a series of optimized tests, and the basis control maps for the pump, including the fuel injection quantity map and the injection timing map, were achieved in terms of the different optimized targets. The performances of the tested engine were obviously improved after control optimization and the exhaust emissions are within the Euro Ⅲ ESC limits.

Key words: internal-combustion engine engineering, electronic controlled diesel, distributor injection pump, management system, calibration