Fuel injection system of an internal combustion engine

Details Fuel injection system of an internal combustion engine Fuel injection system of an internal combustion engine

1988-07-19

1990-02-27

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Fuel injection system

123480, 36443105, F02D 4104, F02D 4134

Patent

active

049036688

ABSTRACT:
A fuel injecting amount of an internal combustion engine is calculated utilizing equations determined from a physical model describing a behavior of fuel in the engine. The fuel injection system includes estimation means in which estimation values fw and fv of the adhering fuel amount and the vapor fuel amount respectively are calculated based on: a product .lambda.r.multidot.m of the detected fuel/air ratio and the detected air amount; a division Vf/.omega. of fuel evaporating amount by the engine speed; and a fuel injecting amount q. The fuel injecting amount is calculated in the system based on the division Vf/.omega., the estimated values fw and fv, the product .lambda.r.multidot.m, and a summed up deviation from a target ratio. The coefficients of respective terms are determined by analyzing the physical model by modern control theory. A variation of the invention does not use an air/fuel ratio sensor.

REFERENCES:
patent: 4357923 (1982-11-01), Hideg
patent: 4388906 (1983-06-01), Sugiyama et al.
patent: 4454847 (1984-06-01), Isomura et al.
patent: 4792905 (1988-12-01), Sekozawa et al.
David G. Luenberger: "Introduction to Dynamic Systems": Theory, Models, and Applications, 1979, pp. 300-309, Chapter 8.10, J. Wiley & Sons, Inc., New York, US.
Patent Abstracts of Japan, vol. 10, No. 51 (M-457) [2108], 28th Feb. 1986; & JP-A-60 201 042 (Aisan Kogyo K.K.) 11-10-1985.

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