Control of highly diluted combustion in Diesel engines

M. Hillion (1, 2) , Jonathan Chauvin (2) , Nicolas Petit (1)

1 CAS - Centre Automatique et Systèmes
2 IFPEN - IFP Energies nouvelles

In this paper, an open-loop control strategy to improve the stability of highly diluted Diesel combustion during sharp transients is proposed. The main advantage of this open-loop method is that no additional in-cylinder sensor is required. The approach coordinates existing airpath and fuelpath controllers, and aims at accurately controlling the end of the cool-flame phenomenon. For this purpose, the injection time is adjusted based on an auto-ignition model and a cool-flame model. Both models are expressed under integral forms, named knock integral models. Experimental results obtained on a test bench and on-board a vehicle are presented. The results highlight the relevance of the approach in terms of combustion stability improvement, pollutant emissions and noise.

Domaines: Automatique / Robotique

M. Hillion, Jonathan Chauvin, Nicolas Petit. Control of highly diluted combustion in Diesel engines. Control Engineering Practice, 2011, 19 (11), pp.1274-1286. ⟨10.1016/j.conengprac.2011.06.006⟩. ⟨hal-00639013⟩