Abstract: The systems and methods are generally directed to engine combustion modeling of an engine having a combustion chamber. In one embodiment, a method includes determining the thermodynamic state of the engine combustion chamber based on received engine parameters. The laminar flame speeds of the combustible mixture are determined based on tabulated measurement results or from correlations available in the literature. The dynamics of the turbulent flame brush thickness are calculated using a 1D nonlinear ordinary differential equation. The mass fraction burned ratio is found by tracking the motion of a presumed truncated spherical flame front as it propagates through the combustion chamber using the mass continuity equation. One or more engine control calibration efficiency factors are then determined based on the resultant mass fraction burned ratio. One or more efficiency factors control at least one aspect of the engine.

Abstract: A continuously variable valve lift mechanism for an internal combustion engine includes a cam, a cam follower, a valve follower, a rocker shaft, and a rocker arm. The cam follower includes a first roller driven by the cam and a second roller. The valve follower includes a driven face in contact with the second roller of the cam follower and a driving face. The rocker shaft contacts the valve follower. Rotational movement of the rocker shaft about a rocker shaft rotational axis results in movement of the driven face with respect to the second roller. The rocker arm has a pivot axis and is in contact with the driving face of the valve follower.

Abstract: A continuously variable valve lift mechanism for an internal combustion engine includes a cam, a cam follower, a valve follower, a rocker shaft, and a rocker arm. The cam follower includes a first roller driven by the cam and a second roller. The valve follower includes a driven face in contact with the second roller of the cam follower and a driving face. The rocker shaft contacts the valve follower. Rotational movement of the rocker shaft about a rocker shaft rotational axis results in movement of the driven face with respect to the second roller.