Method for reducing pollutant emissions and consumption of an engine

摘要: A generally accepted and appropriate means to reduce pollutant emissions consumption of passenger cars diesel engines is apply multiple injection strategies. Assuming constant cylinder bowl geometry rail pressure the variation number injections, quantity each separation between two consecutive injections are major parameters which have be optimised in order fulfill both, legislative emission limits consumer requirements. second, distinct approach decrease a single with shaped rate. Ideally, rate shaping achieved by rise during one event, equal that observed cam controlled systems (e.g. Unit Injectors). For piezo driven common it might possible achieve similar effects modifying needle lift an injection. The object present investigation compare evaluate both methods terms emission, fuel robustness. this purpose, experiments were carried out on research engines. Multiple strategies large hydraulic dwell times compared short setting simulating “rate shaped” Rate was implemented serial SIEMENS VDO injector, performing close or zero.