A 6-cylinder truck engine is modified for turbo charged dual fuel Homogeneous Charge Compression Ignition (HCCI) engine operation. Two different fuels, ethanol and n-heptane, are used to control the ignition timing. The objective of this study is to demonstrate high load operation of a full size HCCI engine and to discuss some of the typical constraints associated with HCCI operation. This study proves the possibility to achieve high loads, up to 16 bar Brake Mean Effective Pressure (BMEP), and ultra low NOx emissions, using turbo charging and dual fuel. Although the system shows great potential, it is obvious that the lack of inlet air pre heating is a drawback at low loads, where combustion efficiency suffers. At high loads, the low exhaust temperature provides little energy for turbo charging, thus causing pump losses higher than for a comparable diesel engine. Design of turbo charger therefore, is a key issue in order to achieve high loads in combination with high efficiency. In spite of these limitations, brake thermal efficiencies and power rating close to those of the original diesel engine are achieved with significant reduction in NOx emissions. The maximum efficiency is 41.2%, which is slightly lower than for the original diesel engine.
A Turbo Charged Dual Fuel HCCI Engine
Sae Technical Papers
International Spring Fuels & Lubricants Meeting ; 2001
2001-05-07
Aufsatz (Konferenz)
Englisch
A turbo charged dual fuel HCCI engine
Kraftfahrwesen | 2001
|Cycle-to-cycle control of a dual-fuel HCCI engine
Kraftfahrwesen | 2004
|HCCI Operating Range in a Turbo-charged Multi Cylinder Engine with VVT and Spray-Guided DI
SAE Technical Papers | 2009
|Cycle-to-Cycle Control of a Dual-Fuel HCCI Engine
SAE Technical Papers | 2004
|