publication . Book . 2007

Direct comparasion of an engine working under Otto, Miller end Diesel cycles : thermodynamic analysis and real engine performance

Ribeiro, Bernardo Sousa; Martins, Jorge;
Open Access English
  • Published: 01 Jan 2007
  • Publisher: Society of Automotive Engineers
  • Country: Brazil
Abstract
One of the ways to improve thermodynamic efficiency of Spark Ignition engines is by the optimisation of valve timing and lift and compression ratio. The throttleless engine and the Miller cycle engine are proven concepts for efficiency improvements of such engines. This paper reports on an engine with variable valve timing (VVT) and variable compression ratio (VCR) in order to fulfill such an enhancement of efficiency. Engine load is controlled by the valve opening period (enabling throttleless operation and Miller cycle), while the variable compression ratio keeps the efficiency high throughout all speed and load conditions. A computer model is used to simulate...
Related Organizations
Funded by
FCT| POCI/EME/59186/2004
Project
POCI/EME/59186/2004
RAPID PROTOTYPING IN THE DEVELOPMENT OF COMPLEX GEOMETRIES: DESIGN OF INTERNAL COMBUSTION ENGINES
  • Funder: Fundação para a Ciência e a Tecnologia, I.P. (FCT)
  • Project Code: 59186
  • Funding stream: POCI
,
FCT| POCI/ENR/59168/2004
Project
POCI/ENR/59168/2004
THERMODYNAMIC OPTIMISATION OF SPARK IGNITION ENGINES UNDER PART LOAD CONDITIONS
  • Funder: Fundação para a Ciência e a Tecnologia, I.P. (FCT)
  • Project Code: 59168
  • Funding stream: POCI
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