Cylinder-specific spark ignition control system for direct fuel

Details Cylinder-specific spark ignition control system for direct fuel Cylinder-specific spark ignition control system for direct fuel

1997-10-24

1999-07-20

Kwon, John

Internal-combustion engines

Spark ignition timing control

Electronic control

12340623, F02P 500

Patent

active

059244046

ABSTRACT:
A direct fuel injected two-stroke engine controls spark ignition timing and/or ignition coil dwell time on a cylinder-specific basis. The engine also preferably controls fuel injection timing and amount and injection/delivery duration on a cylinder-specific basis. Cylinder-specific customization of spark ignition and fuel injection allows better coordination of spark with fuel injection which results in better running quality, lower emissions, etc. Memory in the electronic control unit for the engine preferably includes a high resolution global look-up table that determines global values for spark ignition and fuel injection control based on engine load (e.g. throttle position, manifold air pressure, etc.) and engine speed. Memory in the electronic control unit also includes a plurality of low resolution, cylinder-specific offset value look-up tables from which cylinder-specific offset values for spark ignition and fuel injection can be determined, preferably depending on engine load and engine speed. The offset values are combined with the global values to generate cylinder-specific control signals for spark ignition and fuel injection.

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patent: 5546905 (1996-08-01), Fukui
Mercury/Mariner Direct Fuel Injection (DFI), Service Manual, Brunswick Corporation, 1996, pp. 1-90.

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