Engine system and method with cylinder deactivation
AssigneeFord Global Technologies, LLC
InventorsGopichandra Surnilla, David Bidner, Shane Elwart, Jeff Doering, Christian T. Goralski, Jr.
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Abstract
Various systems and methods are disclosed for carrying out combustion in a fuel-cut operation in some or all of the engine cylinders of a vehicle. Further, various subsystems are considered, such as fuel vapor purging, air-fuel ratio control, engine torque control, catalyst design, and exhaust system design.
Claims15
A computer readable storage medium having stored data representing instructions executable by a computer for operating an engine, the computer readable storage medium comprising:
- instructions for operating with at least a portion of all cylinders of the engine combusting air and injected fuel,
- instructions for, after said operation with at least a portion of all cylinders of the engine combusting air and injected fuel and in response to a decrease in requested engine output, disabling fuel injection to all of the cylinders of the engine, and
- instructions for, in response to an increase in requested engine output, after said requested decrease, commencing combustion in at least some of the cylinders at a lean air-fuel ratio at least during some circumstances.
A computer readable storage medium having stored data representing instructions executable by a computer for operating an engine, the computer readable storage medium comprising:
- instructions for operating with all cylinders of the engine combusting air and injected fuel,
- instructions for, after said operation with at least a portion of all cylinders of the engine combusting air and injected fuel and in response to a decrease in requested engine output indicated by a tip-out by a vehicle operator, disabling fuel injection to all of the cylinders of the engine, and
- instructions for, in response to an increase in requested engine output by a tip-in by said vehicle operator, after said requested decrease, commencing combustion in at least some of the cylinders at a lean air-fuel ratio at least during some circumstances.
A method for operating an engine, comprising:
- operating with all cylinders of the engine combusting air and injected fuel,
- after said operation with at least a portion of all cylinders of the engine combusting air and injected fuel and to provide a decrease in engine output in response to a tipout by a vehicle operator, disabling fuel injection to all of the cylinders of the engine, and
- in response to an increase in engine output caused by a tip-in by said vehicle operator, after said decrease, commencing combustion in at least some of the cylinders at a lean air-fuel ratio at least during some circumstances.
Dependencies are inferred from the claim text.