Engine system and method for injector cut-out operation with improved exhaust heating
First Claim
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1. A method for controlling an engine with at least a first set of cylinders and a second set of cylinders, the method comprising:
- during an engine start, operating the second set of cylinders with an ignition timing more retarded than an ignition timing of said first set of cylinders, and during engine operation, operating the first set of cylinders with injected fuel to carry out combustion and operating the second set of cylinders to induct air and without injected fuel.
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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
21 Claims
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1. A method for controlling an engine with at least a first set of cylinders and a second set of cylinders, the method comprising:
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during an engine start, operating the second set of cylinders with an ignition timing more retarded than an ignition timing of said first set of cylinders, and during engine operation, operating the first set of cylinders with injected fuel to carry out combustion and operating the second set of cylinders to induct air and without injected fuel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 17)
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14. A method for controlling an engine with at least a first set of cylinders and a second set of cylinders, where a first catalyst is coupled to the first set and a second catalyst is coupled to both said first and second set downstream of said first catalyst, the method comprising:
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operating the first set of cylinders with injected fuel to carry out combustion and operating the second set of cylinders to induct air and without injected fuel; and
after said operation, commencing fuel injection in said second set of cylinders, and during said commencing, operating said second set of cylinders with an ignition timing that is more retarded than an ignition timing of said first set, with said first set carrying out combustion about stoichiometry. - View Dependent Claims (18, 19, 20)
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- 15. The method of claim 15 wherein there is no catalyst coupled between said second set of cylinders and said second catalyst.
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21. A computer readable storage medium having instructions encoded therein for controlling an engine with at least a first set of cylinders and a second set of cylinders, the medium comprising:
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code for operating the second set of cylinders with an ignition timing more retarded than an ignition timing of said first set of cylinders during an engine start, and code for operating the first set of cylinders with injected fuel to carry out combustion and operating the second set of cylinders to induct air and without injected fuel during subsequent engine operation.
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Specification