Savoy, J., Moraes de Souza, M., and Domingues, T., "Innovative Solution for the Valve Lifts Variation of Combustion Engines," SAE Technical Paper 2012-36-0199, 2012, doi:10.4271/2012-36-0199.
The constant search for more efficient combustion engines with lower levels of CO₂ emissions has contributed to the development of new technologies that could reach severe global environment targets. Most of the new technologies are related to the lift and timing variation of the opening and closing of the intake valves, through variable camshafts. The controlled lift and timing variation allows the air-fuel mixture to be optimized for specific working conditions of the engine without the driver's perception.This paper presents a new design and a new operation concept for the lift variation of the intake valve. The technical and economical feasibility analysis of this new design is done through virtual studies and prototypes in the Alpha phase of the project. The valve lift control optimizes the fuel consumption, and consequently, it reduces the levels of CO₂ emissions.