Variable air/fuel ratio engine control system with closed-loop c

Details Variable air/fuel ratio engine control system with closed-loop c Variable air/fuel ratio engine control system with closed-loop c

1991-05-22

1991-11-26

Nelli, Raymond A.

Internal-combustion engines

Engine speed regulator

Specific throttle valve structure

123435, F02D 908

Patent

active

050674609

ABSTRACT:
System for controlling a spark ignition engine to maximize fuel efficiency over its entire range of operating conditions. The system includes apparatus for controlling the amount of fuel delivered to the engine and apparatus for measuring the internal cylinder pressure in at least one cylinder of the engine. Apparatus is provided for estimating the air mass entering the engine and computing apparatus calculates the engine efficiency from the amount of fuel delivered, the internal cylinder pressure and the estimated air mass entering the engine. In one embodiment, efficiency is measured by calculation of the approximate indicated specific fuel consumption. Apparatus is provided for varying the amount of fuel delivered to the engine to minimize the indicated specific fuel consumption over the entire range of operating conditions of the engine. In this embodiment, apparatus is provided which is responsive to a desired engine power output beyond wide open throttle plate and apparatus is provided for delivering a greater quantity of fuel beyond the wide open throttle plate position maximum efficiency point.

REFERENCES:
patent: 4409940 (1983-10-01), Gaus
patent: 4688533 (1987-08-01), Otobe
patent: 4698535 (1987-10-01), Shiraki et al.
patent: 4836167 (1989-06-01), Huffman et al.
patent: 4877005 (1989-10-01), Law et al.
patent: 4892071 (1990-01-01), Asayama
patent: 5016586 (1991-05-01), Iwamura et al.

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