Lean burn engine speed control
AssigneeFord Global Technologies, LLC
InventorsJohn David Russell, Allan Joseph Kotwicki
Life of this patent
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Abstract
A method for controlling an engine having both an electronically controlled inlet device, such as an electronic throttle unit, and an electronically controlled outlet device, such as a variable cam timing system is disclosed. The method of the present invention achieves cylinder air charge control that is faster than possible by using an inlet device alone. In other words, the method of the present invention controls cylinder air charge faster than manifold dynamics by coordination of the inlet and outlet device. This improved control is used to improve various engine control functions.
Claims20
A method for controlling an engine having at least one cylinder, the engine also having an intake manifold and an outlet control device for controlling flow from the intake manifold into the cylinder and an inlet control device for controlling flow into the intake manifold, comprising:
- generating a fuel injection amount;
- and
- preventing an engine air/fuel ratio from entering a predetermined air/fuel ratio range by changing both the inlet control device and the outlet control device based on said fuel injection amount.
A method for controlling an engine having at least one cylinder, the engine also having an intake manifold and an outlet control device for controlling flow from the intake manifold into the cylinder and an inlet control device for controlling flow into the intake manifold, comprising:
- generating a fuel injection amount;
- determining a restricted range of the flow into the cylinders based on said fuel injection amount and a restricted air/fuel ratio range;
- and
- adjusting both the inlet control device and the outlet control device based on said restricted air amount range.
An article of manufacture comprising:
- a computer storage medium having a computer program encoded therein for controlling an engine having at least one cylinder, the engine also having an intake manifold and an outlet control device for controlling flow from the intake manifold into the cylinder and an inlet control device for controlling flow into the intake manifold, said computer storage medium comprising:
- code for generating a fuel injection amount;
- code for determining a restricted air amount range based on said fuel injection amount;
- and
- code for adjusting both the inlet control device and the outlet control device based on said restricted air amount range.
Dependencies are inferred from the claim text.