Control system and control process in internal combustion engine

Details Control system and control process in internal combustion engine Control system and control process in internal combustion engine

1997-04-15

1998-12-22

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Fuel injection system

F02P 500

Patent

active

058508155

ABSTRACT:
A control system is provided in an internal combustion engine in which a valve timing such as an opening time point and lift amount of an intake valve can be switched to a low-speed or high-speed valve timing within a lean-burn control range established in accordance with the operational state, such as an intake pipe internal absolute pressure and an engine revolution number of the engine, wherein an air-fuel ratio of an air-fuel mixture supplied to the internal combustion engine is enriched for a predetermined time when the valve timing is switched from the low-speed valve timing to the high-speed valve timing while carrying out a lean-burn control. Thus, even when the valve timing is switched over to the high-speed valve timing, the lean-burn control is carried out to prevent a misfiring or an unstable combustion state caused when the valve timing is switched during the lean-burn control, thereby providing a reduction in emission and an enhancement in drivability, while enhancing the specific fuel consumption.

REFERENCES:
patent: 5577475 (1996-11-01), De Backer et al.
patent: 5584274 (1996-12-01), Fukui et al.
patent: 5640939 (1997-06-01), Shimada et al.

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