System for optimizing the performance of internal combustion eng

Details System for optimizing the performance of internal combustion eng System for optimizing the performance of internal combustion eng

1992-04-06

1992-12-08

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Fuel injection system

123414, F02P 506

Patent

active

051688530

ABSTRACT:
An engine performance optimizing system is described that requires only a single engine parameter (shaft revolution time) to be measured. By simultaneously dithering spark timing, air/fuel ratio and/or EGR rate in accordance with a predetermined cyclic pattern, and measuring shaft speed during each discrete phase of the dither cycle, correction factors can be computed and used to adjust the spark setting, the air flow and/or the recirculation rate in a way that causes engine performance to be enhanced in terms of fuel economy and lowered emissions.

REFERENCES:
patent: 4026251 (1977-05-01), Schweitzer et al.
patent: 4575800 (1986-03-01), Kittelson
patent: 4586473 (1986-05-01), Mguyen
patent: 4841933 (1989-06-01), McHale et al.
patent: 4893600 (1990-01-01), Holmes
patent: 4915079 (1990-04-01), Holmes
patent: 4969439 (1990-11-01), Scotson
patent: 5001645 (1991-03-01), Williams et al.

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