| 摘要 |
<p>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. <IMAGE></p> |
