Parametric Study on CAI Combustion in a GDI Engine with an Air-Assisted Injector Brunel University

Format:

Conference/Event

Author/Creator:

Li, Yufeng, author.

Conference Name:

SAE World Congress & Exhibition (2007-04-16 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2007

Summary:

Controlled auto-ignition (CAI) combustion and engine performance and emission characteristics have been intensively investigated in a single-cylinder gasoline direct injection (GDI) engine with an air-assisted injector. The CAI combustion was obtained by residual gas trapping. This was achieved by using low-lift short-duration cams and early closing the exhaust valves. Effects of EVC (exhaust valve closure) and IVO (intake valve opening) timings, spark timing, injection timing, coolant temperature, compression ratio, valve lift and duration, on CAI combustion and emissions were investigated experimentally. The results show that the EVC timing, injection timing, compression ratio, valve lift and duration had significant influences on CAI combustion and emissions. Early EVC and injection timing, higher compression ratio and higher valve lift could enhance CAI combustion. IVO timing had minor effect on CAI combustion. The spark timing had little effect on CAI combustion when the engine operated in the fully-developed CAI mode. Coolant temperature was revealed to have substantial impact on CAI combustion when the coolant temperature is below 65°C

Notes:

Vendor supplied data

Publisher Number:

2007-01-0196

Access Restriction:

Restricted for use by site license