ENGINE SYSTEM AND METHOD WITH CYLINDER DEACTIVATION
First Claim
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1. 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.
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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.
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Citations
20 Claims
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1. A computer readable storage medium having stored data representing instructions executable by a computer for operating an engine, the computer readable storage medium comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 17, 18)
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11-15. -15. (canceled)
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16. A computer readable storage medium having stored data representing instructions executable by a computer for operating an engine, the computer readable storage medium comprising:
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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.
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19. A method for operating an engine, comprising:
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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 tip-out 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. - View Dependent Claims (20)
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Specification