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US 2016/0108825 A1Published application
Methods and system for reactivating engine cylinders
AssigneeFord Global Technologies, LLC
InventorTodd Anthony Rumpsa
Life of this patent
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Abstract
Systems and methods for reactivating cylinders of an engine that have been temporarily deactivated to conserve fuel are presented. The systems and methods adjust fuel injection quantity and timing of direct fuel injectors to reduce particulate emissions that may form in cylinders that are being reactivated due to reduced piston and combustion chamber temperatures that may occur in newly reactivated cylinders.
Claims20
A method, comprising:
- operating a first cylinder of an engine while a second cylinder of the engine is deactivated;
- reactivating the second cylinder in an engine cycle where the first cylinder is supplied a first actual total number of fuel injections;
- and
- supplying the second cylinder a second actual total number of fuel injections different than the first actual total number of fuel injections during the engine cycle.
1 more element
A method, comprising:
- combusting air and fuel in a first cylinder of an engine with a first start of fuel injection timing while a second cylinder of the engine is deactivated;
- reactivating the second cylinder during an engine cycle and supplying fuel to the second cylinder at a second start of fuel injection timing retarded from the first start of fuel injection timing;
- and
- retarding timing of fuel supplied to the first cylinder to the second start of fuel injection timing in response to reactivating the second cylinder.
1 more element
A method for an engine comprising:
- selectively deactivating a cylinder of the engine based on engine load while continuing to rotate the engine;
- in response to a first reactivation of the cylinder, selectively adjusting fuel injection timing of the cylinder based engine operating conditions while providing a different fuel injection timing to other respective cylinders of the engine;
- and
- in response to a second reactivation of the cylinder, adjusting fuel injection timing of all engine cylinders to a same timing.
1 more element
Dependencies are inferred from the claim text.