2-Stroke CAI Combustion Operation in a GDI Engine with Poppet Valves

Paper #:
  • 2012-01-1118

Published:
  • 2012-04-16
Citation:
Zhang, Y., Ojapah, M., Cairns, A., and Zhao, H., "2-Stroke CAI Combustion Operation in a GDI Engine with Poppet Valves," SAE Technical Paper 2012-01-1118, 2012, https://doi.org/10.4271/2012-01-1118.
Pages:
7
Abstract:
In order to extend the CAI operation range in 4-stroke mode and maximize the benefit of low fuel consumption and emissions in CAI mode, 2-stroke CAI combustion is revived operating in a GDI engine with poppet valves, where the conventional crankcase scavenging is replaced by boosted scavenging. The CAI combustion is achieved through the inherence of the 2-Stroke operation, which is retaining residual gas. A set of flexible hydraulic valve train was installed on the engine to vary the residual gas fraction under the boosting condition. The effects of spark timing, intake pressure and short-circuiting on 2-stroke CAI combustion and its emissions are investigated and discussed in this paper. Results show the engine could be controlled to achieve CAI operation over a wide range of engine speed and load in the 2-stroke mode because of the flexibility of the electro-hydraulic valvetrain system.
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