Air/fuel ratio control in an internal combustion engine

Details Air/fuel ratio control in an internal combustion engine Air/fuel ratio control in an internal combustion engine

1989-12-04

1991-05-28

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Including cylinder pressure or temperature responsive means

123436, F02M 700

Patent

active

050184989

ABSTRACT:
In an internal combustion engine that includes at least one cylinder having a piston coupled to an engine crankshaft, a fuel injector coupled to a fuel supply and responsive to electronic signals for feeding fuel from the supply directly into the cylinder, and an air supply that includes a throttle valve responsive to electronic signals for controlling quantity of combustion air fed to the cylinder, a method and system for controlling the air/fuel ratio within the cylinder to obtain combustion at or near the lean limit beyond which the engine misfires. Actual combustion is monitored and compared as a function of crank angle with a predetermined combustion characteristic indicative of operation at the lean burn limit. The throttle valve is controlled as a function of the resulting error signal to restrict air supply to the combustion cylinder so that cylinder combustion approaches the predetermined lean burn characteristic.

REFERENCES:
patent: 4216750 (1980-08-01), Kobayashi
patent: 4368707 (1983-01-01), Leshner et al.
patent: 4463733 (1984-08-01), Tsai
patent: 4471741 (1984-09-01), Asik et al.
patent: 4475506 (1984-10-01), Riordan
patent: 4480620 (1984-11-01), Tange et al.
patent: 4543934 (1985-10-01), Morita et al.
patent: 4624229 (1986-11-01), Matekunas
patent: 4736724 (1988-04-01), Hamburg et al.

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