초록 ▼

An engine system for an internal combustion engine of a type having a stratified combustion mode and a homogeneous combustion mode comprises a controller for increasing a fuel air ratio (or equivalence ratio) of an air fuel mixture produced in the engine abruptly in a transient state during transiti

An engine system for an internal combustion engine of a type having a stratified combustion mode and a homogeneous combustion mode comprises a controller for increasing a fuel air ratio (or equivalence ratio) of an air fuel mixture produced in the engine abruptly in a transient state during transition from the stratified mode to the homogenous mode to ensure stable combustion. The controller estimates a residual EGR gas quantity, and produces a step change in the fuel air ratio when the fuel air ratio enters a predetermined unstable range and the EGR gas still remains in a considerable amount.

대표청구항 ▼

[ What is claimed is:] [1.] Apparatus for changing combustion in an internal combustion engine between a stratified charge combustion mode and a homogeneous charge combustion mode, the apparatus comprising:a controller for varying a fuel/air ratio gradually from a first ratio level for the stratifie

[ What is claimed is:] [1.] Apparatus for changing combustion in an internal combustion engine between a stratified charge combustion mode and a homogeneous charge combustion mode, the apparatus comprising:a controller for varying a fuel/air ratio gradually from a first ratio level for the stratified charge combustion mode to a second ratio level for the homogeneous charge combustion mode to achieve a changeover from the stratified mode to the homogeneous mode, and for changing the fuel/air ratio steeply toward the second ratio level, instead of varying the fuel/air ratio gradually, when the fuel air ratio enters a predetermined unstable range in a transient state during transition from the stratified combustion mode to the homogeneous combustion mode.