System and method for controlling valve timing of an engine with cylinder deactivation
First Claim
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1. A system comprising:
- an engine having a first bank and a second bank, with each of said banks having cylinders, the engine having a first group of cylinders including cylinders from said first and second banks, and a second group of cylinders from said first and second banks;
a first emission control device coupled exclusively to said first group of cylinders; and
a second emission control device coupled to both said first and second groups; and
a third emission control device coupled exclusively to said second group of cylinders.
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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
9 Claims
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1. A system comprising:
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an engine having a first bank and a second bank, with each of said banks having cylinders, the engine having a first group of cylinders including cylinders from said first and second banks, and a second group of cylinders from said first and second banks; a first emission control device coupled exclusively to said first group of cylinders; and a second emission control device coupled to both said first and second groups; and a third emission control device coupled exclusively to said second group of cylinders.
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2. A system comprising:
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an engine having a first bank and a second bank, which each of said banks having cylinders, the engine having a first group of cylinders including cylinders from said first and second banks, and a second group of cylinders from said first and second banks; a first emission control device coupled exclusively to the cylinders of said first group of cylinders in said first bank; a second emission control device coupled exclusively to the cylinders of said first group of cylinders in said second bank; and a third emission control device receiving exhaust gasses from said first and second emission control devices and untreated exhaust from said second group of cylinders. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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Specification