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US 10,947,920 B2Granted
Method and system for monitoring soot production
AssigneeFord Global Technologies, LLC
InventorsDouglas Raymond Martin, Kenneth James Miller
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for using an engine laser ignition system to take images, in real-time, of a cylinder during combustion and estimate cylinder soot generation. If excess soot generation is determined, cylinder fueling is adjusted by varying an injection pressure, amount, and ratio. An air-fuel ratio of the cylinder is also adjusted in view of exhaust temperature constraints to reduce soot generation.
Claims11
A method, comprising:
- adjusting a cylinder fueling responsive to an amount of soot generated in a cylinder, the amount of soot estimated at a controller based on an image generated through a laser ignition device, wherein adjusting the cylinder fueling includes adjusting a split ratio of a fuel injection to the cylinder to decrease a compression stroke fuel injection relative to an intake stroke fuel injection while maintaining a combustion air-fuel ratio, thereby reducing the amount of soot generated in the cylinder, wherein the intake stroke fuel injection is an intake stroke direct injection and the compression stroke fuel injection is a compression stroke direction injection, and wherein adjusting the split ratio comprises increasing a pulse width of the intake stroke direct injection while decreasing a pulse width of the compression stroke direct injection until a pulse width limit of the intake stroke direct injection is reached, and then increasing a first portion of a total amount of fuel injected to the cylinder via port injection relative to a second portion of the total amount of fuel injected to the cylinder via the compression stroke direct injection and the intake stroke direct injection.
Dependencies are inferred from the claim text.