System for emission device control with cylinder deactivation
First Claim
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1. A method for controlling an engine with first and second set of cylinder, where the first set is coupled to a first upstream emission control device, the method comprising:
- operating in a first mode with the first set of cylinder combusting an air-fuel mixture that oscillates about stoichiometry and second set of second set of cylinders pumping air without injected fuel; and
after said first mode, operating in a second mode with both sets of cylinders combusting, where the first set of cylinders continues combustion that oscillates about stoichiometry and the second set combusts a rich air-fuel mixture for at least a selected duration, and then combusts an air-fuel mixture that oscillates about stoichiometry.
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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.
73 Citations
17 Claims
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1. A method for controlling an engine with first and second set of cylinder, where the first set is coupled to a first upstream emission control device, the method comprising:
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operating in a first mode with the first set of cylinder combusting an air-fuel mixture that oscillates about stoichiometry and second set of second set of cylinders pumping air without injected fuel; and
after said first mode, operating in a second mode with both sets of cylinders combusting, where the first set of cylinders continues combustion that oscillates about stoichiometry and the second set combusts a rich air-fuel mixture for at least a selected duration, and then combusts an air-fuel mixture that oscillates about stoichiometry.
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- 2. The method of claim 2 wherein the engine further comprising a downstream emission control device coupled downstream of said first upstream emission control device, and also coupled to said second set of cylinders.
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9. A method for controlling an engine with first and second set of cylinder, where the first set is coupled to a first upstream emission control device and the second set is coupled to a second upstream emission control device, with exhaust gasses from both said first and second upstream emission control devices mixing and entering a downstream emission control device, the method comprising:
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operating in a first mode with both the first and second sets of cylinder pumping air without injected fuel;
after said first mode, operating in a second mode with both sets of cylinders combusting a rich air-fuel ratio, where the first set of cylinders ends said rich air-fuel operation based on a condition in the first emission control device and operates to combust an air-fuel ratio that oscillates about stoichiometry, and said second set of cylinders continues said rich operation thereafter.
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Specification