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US 6,024,069 AGranted
Controller for an internal combustion engine
AssigneeNissan Motor Co., Ltd.
InventorTakahiro Yoshino
Life of this patent
Estimating the term…
Abstract
The invention stabilizes combustion performance upon a change from operation with stratified combustion to operation with homogeneous combustion. The lower limit for the equivalence ratio just after a change from operation with stratified combustion to operation with homogeneous combustion is set at a value greater than set under steady conditions so as to avoid adverse influence of residual external and internal EGR (exhaust gas recirculation).
Claims8
A controller for an internal combustion engine having a cylinder and an injector to inject fuel directly into the cylinder, the controller comprising:
- a discriminating section to detect a change of combustion in the cylinder from stratified combustion to homogeneous combustion;
- a homogeneous transient condition discriminating section to detect a transient condition of operation with homogeneous combustion just after a change is made from operation with stratified combustion to operation with homogeneous combustion;
- a homogeneous steady-state condition discriminating section to detect steady-state homogeneous combustion;
- a section to calculate a ratio between air and fuel for the cylinder;
- and
- a limiter to limit the ratio between air and fuel in a range such that a minimum amount of fuel relative to an amount of air is increased when operating in said transient condition of operation with homogeneous combustion just after a change is made from operation with stratified combustion to operation with homogeneous combustion compared with the ratio between air and fuel during steady-state homogeneous combustion.
3 more elements
Dependencies are inferred from the claim text.