Air-fuel ratio feed back type fuel injection control system

Details Air-fuel ratio feed back type fuel injection control system Air-fuel ratio feed back type fuel injection control system

1977-03-23

1978-08-22

Smith, Jerry

Boots, shoes, and leggings

123 32EA, G06G 770, F02M 700

Patent

active

RE0297410

ABSTRACT:
A fuel injection control system comprising an air-fuel ratio feedback control in combination with an electronically controlled fuel injection system. In this system, the concentration of oxygen contained in the engine exhaust gases is compared with a predetermined value in a comparator whereby whether the fuel injection quantity is to be corrected in a direction to increase it or in a direction to decrease it is determined in accordance with the output of the comparator, and the rate of change of the correction is controlled in accordance with a sum output produced by adding a detected value of engine rpms and a detected value of engine intake state. When the air-fuel control cannot operate properly, for example because of a low exhaust temperature or under deceleration conditions, a holding circuit is connected to the integrater output to maintain the integrated output at a value intermediate the fluctuating range thereof. The system has an excellent follow-up characteristic to respond to rapid changes in the operating conditions of an engine and it is capable of maintaining the air-fuel mixture ratio at a predetermined value.

REFERENCES:
patent: 3643635 (1972-02-01), Milam
patent: 3736910 (1973-06-01), Raff
patent: 3782347 (1974-01-01), Schmidt et al.
patent: 3789816 (1974-02-01), Taplin et al.
patent: 3809028 (1974-05-01), Luchaco
patent: 3815561 (1974-06-01), Seitz
J. G. Rivard, "Closed-Loop Electronic Fuel Injection Control of the Internal-Combustion Engine", Society of Automotive Engineers, International Automotive Engineering Congress, Jan. 8-12, 1973, pp. 1-9.

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