System and method for detecting an air leak in an engine
AssigneeFord Global Technologies, LLC
InventorsEdward Ponagai, Gary Lee Danhoff, Ghassan Hussini, Ghassan K. Raad, Michael igor Kluzner, Raymond Henry Berger, Robert Joseph Jerger
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Abstract
A system and method for detecting an air leak within an engine is provided. The engine includes an intake manifold communicating with an engine cylinder. The method includes measuring an exhaust gas constituent in exhaust gases from the engine when the engine is operating in an idle operating mode. The method further includes determining whether the air leak is present in the engine based on a measured exhaust gas constituent, a first air-fuel correction value, and a second air-fuel correction value.
Claims16
A method for detecting an air leak within an engine, said engine including an intake manifold communicating with an engine cylinder, said method comprising:
- measuring an exhaust gas constituent in exhaust gases from said engine when said engine is operating in an idle operating mode;
- and,
- determining whether said air leak is present in said engine based on said measured exhaust gas constituent, a first air-fuel correction value, and a second air-fuel correction value.
A method for detecting an air leak within an engine, said engine including an intake manifold communicating with an engine cylinder, said method comprising:
- determining a first value indicative of a lean air-fuel ratio in exhaust gases from said engine;
- determining a second value indicative of a first air-fuel correction value for said engine;
- determining a third value indicative of a second air-fuel correction value for said engine;
- and
- indicating an air leak is detected within said engine based on said first, second, and third values.
A system for detecting an air leak within an engine, said engine including an intake manifold communicating with an engine cylinder, said system comprising:
- a first sensor generating a first signal indicative of either a mass air flow or a pressure in said intake manifold;
- a second sensor generating a second signal indicative of an engine speed;
- a third sensor generating a third signal indicative of an air-fuel ratio in exhaust gases from said engine;
- and,
- a controller operably connected to said first, second, and third sensors, said controller configured to determine when said engine is operating in an idle operating mode based on said first and second signals, said controller further configured to determine whether said air leak is present in said engine based on said third signal, a first air-fuel correction value, and a second air-fuel correction value.
An article of manufacture, comprising:
- a computer storage medium having a computer program encoded therein for detecting an air leak within an engine, said engine including an intake manifold communicating with an engine cylinder, said computer storage medium comprising:
- code for determining a first value indicative a lean air-fuel ratio in exhaust gases from said engine;
- code for determining a second value indicative of a first air-fuel correction value for said engine;
- code for determining a third value indicative of a second air-fuel correction value for said engine;
- and
- code for indicating said air leak is detected within said engine based on said first, second, and third values.
Dependencies are inferred from the claim text.