Control method for engine
AssigneeFord Global Technologies, LLC
InventorsJohn D. Russell, Mrdjan J. Jankovic
Life of this patent
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Abstract
A control method adjusts fuel injection into an engine having a variable compression ratio. The method determines the cylinder air amount based on various sensors and the current compression ratio. The disclosed fuel injection method can perform both open loop and closed loop control. A method is also disclosed for putting the compression ratio to a base value during engine shutdown so that subsequent engine starts occur with a consistent compression ratio.
Claims20
A method for operating an internal combustion engine, the engine having a variable compression ratio, the engine coupled to an exhaust gas sensor, the method comprising:
- determining a fuel injection amount based on a parameter indicative of a compression ratio of the variable compression ratio engine;
- determining a correction signal based on the exhaust gas sensor;
- injecting fuel into the engine based on said fuel injection amount and said correction signal.
A method for operating an internal combustion engine, the engine having a variable compression ratio, the engine coupled to an exhaust gas sensor, the method comprising:
- determining a fuel injection amount based on a parameter indicative of a compression ratio of the variable compression ratio engine;
- wherein said fuel injection amount is determined independently of the exhaust gas sensor so as to maintain a desired air-fuel ratio and reduce exhaust gas emissions;
- and
- injecting fuel into the engine based on said fuel injection amount.
A method for operating an internal combustion engine, the engine having a variable compression ratio, the engine coupled to an exhaust gas sensor, comprising:
- determining a fuel injection amount based on a parameter indicative of a compression ratio of the variable compression ratio engine;
- wherein said fuel injection amount is determined independently of the exhaust gas sensor;
- and
- injecting fuel into the engine based on said fuel injection amount, wherein said determining is performed during catalyst protection fuel rich conditions.
A method for operating an internal combustion engine, the engine having a variable compression ratio, the engine coupled to an exhaust gas sensor, the method comprising:
- determining a fuel injection amount based on a parameter indicative of a compression ratio of the variable compression ratio engine;
- determining a desired air-fuel ratio based on an engine operating condition;
- determining a correction signal based on the exhaust gas sensor;
- and
- injecting fuel into the engine based on said fuel injection amount, said desired air-fuel ratio and said correction signal.
A system comprising:
- an internal combustion engine, said engine having a variable compression ratio mechanism;
- an exhaust coupled to said engine;
- an exhaust gas sensor coupled to said exhaust;
- a three way catalyst coupled to said exhaust;
- and
- a controller determining a fuel injection amount based on a parameter indicative of a compression ratio of the variable compression ratio mechanism;
- determining a desired air-fuel ratio based on an engine operating condition;
- determining a correction signal based on the exhaust gas sensor;
- and injecting fuel into the engine based on said fuel injection amount, said desired air-fuel ratio and said correction signal.
A system comprising:
- an internal combustion engine, said engine having a variable compression ratio mechanism;
- an exhaust coupled to said engine;
- an exhaust gas sensor coupled to said exhaust;
- an emission control device coupled to said exhaust;
- and
- a controller determining a fuel injection amount based on a parameter indicative of a compression ratio of the variable compression ratio mechanism;
- determining a correction signal based on the exhaust gas sensor;
- and injecting fuel into the engine based on said fuel injection amount and said correction signal.
Dependencies are inferred from the claim text.