Torque control for engine during cylinder activation or deactivation
First Claim
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1. A method for controlling an engine having a first group of cylinders and a second group of cylinders, the method comprising:
- operating in a first mode with said first group combusting inducted air and injected fuel and said second group operating with inducted air and substantially no injected fuel;
transitioning to a second mode with said second group combusting inducted air and injected fuel and said first group operating with inducted air and substantially no injected fuel;
before said transition, reducing torque of a last to be combusted cylinder in said first group compared with a previously combusted cylinder in said first group; and
after said transition, reducing torque of a first to be combusted cylinder in said second group compared with a next combusted cylinder in said second group.
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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.
72 Citations
22 Claims
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1. A method for controlling an engine having a first group of cylinders and a second group of cylinders, the method comprising:
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operating in a first mode with said first group combusting inducted air and injected fuel and said second group operating with inducted air and substantially no injected fuel; transitioning to a second mode with said second group combusting inducted air and injected fuel and said first group operating with inducted air and substantially no injected fuel; before said transition, reducing torque of a last to be combusted cylinder in said first group compared with a previously combusted cylinder in said first group; and after said transition, reducing torque of a first to be combusted cylinder in said second group compared with a next combusted cylinder in said second group. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for controlling an engine having a first group of cylinders and a second group of cylinders, the method comprising:
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operating in a first mode with said first group combusting inducted air and injected fuel and said second group operating with inducted air and substantially no injected fuel; transitioning to a second mode with said second group combusting inducted air and injected fuel and said first group operating with inducted air and substantially no injected fuel; and performing at least one of; before said transition, reducing torque of a last to be combusted cylinder in said first group compared with a previously combusted cylinder in said first group; and after said transition, reducing torque of a first to be combusted cylinder in said second group compared with a next combusted cylinder in said second group. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification