Diesel engines equipped with piezoelectric and solenoid injectors: hydraulic performance of the injectors and comparison of the emissions, noise and fuel consumption

摘要

A comprehensive comparison between solenoid and indirect acting piezoelectric injectors has been carried out. The working principle of these injector typologies is illustrated, and their hydraulic performance has been analysed and discussed on the basis of experimental data collected at a hydraulic test rig. The injector characteristics, injected flow-rate profiles, nozzle opening and closure delays, injector leakages and injected volume fluctuations with the dwell time have been compared in order to evaluate the impact of the injector driving system.