System for emission device control with cylinder deactivation
AssigneeFord Global Technologies, LLC
InventorsGopichandra Sumilla, Christian T. Goralski, Jr., Stephen B. Smith
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.
Claims17
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.
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:
- 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.
Dependencies are inferred from the claim text.