Back to results
US 7,028,670 B2Granted
Torque control for engine during cylinder activation or deactivation
AssigneeFord Global Technologies, LLC
InventorJeff Doering
Life of this patent
Estimating the term…
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.
Claims22
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.
2 more elements
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;
- 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.
4 more elements
Dependencies are inferred from the claim text.