Abstract
The pilot injection strategy is a widely used approach for reducing the noise of the combustion process in direct injection diesel engines. In the last generation of automotive diesel engines up to several pilot injections could occur to better control the rate of heat release (ROHR) in the cylinder as well as the pollutant formation. However, determination of the timing and duration for each pilot injection needs to be precisely optimised. In this paper an experimental study of the pilot injection strategy was conducted on a direct injection diesel engine. Single and double pilot injection strategy was studied. The engine rated power is 100 kW at 4000 rpm while the rated torque is 320 Nm at 2000 rpm. An engine operating point determined by the rotation speed of 1400 rpm and torque of 100 Nm was chosen. The pilot and pre-injection timing was widely varied in order to study the influence on the combustion process as well as on the fuel consumption.
Highlights
A more demanding emissions homologation procedure for light duty vehicle was imposed by the EU
The experimental test was conducted at 1400 rpm and engine torque of 100 Nm. This operating point is a representative point in both the WLTC and RDE tests for passenger cars
In order to study the influence on the combustion characteristics as well as on the fuel consumption, the engine output torque was constant
Summary
A more demanding emissions homologation procedure for light duty vehicle was imposed by the EU. The results revealed that small pilot injection and late start of the pilot injection reduced the ignition delay period, so that the rate of heat release peak decreased. It leads to lower soot emission due to better oxidation of the soot. The pilot-injection strategy in comparison with the single injection leads to increased number and mass of the particles with diameter above 0.1μm. The aim of this paper is to study the impact of single and double pilot injection strategies applied to a passenger car DI diesel engine
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