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US 2018/0023500 A1Published application
Methods and systems for dual fuel injection
AssigneeFord Global Technologies, LLC
InventorsPaul Hollar, Ron Reichenbach, Ethan D. Sanborn, Daniel Dusa, Joseph Lyle Thomas
Life of this patent
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Abstract
Methods and a system are provided for controlling fuel injection in a vehicle engine. The system specifically relates to an engine fueled with both port and direct fuel injectors. In one example, a method may include delivering a first portion of fuel via port injection during a first injection window, and subsequently delivering a second portion of fuel directly during a second injection window before the engine exits cranking speeds.
Claims20
A method for an engine, comprising:
- for a first number of consecutive combustion events counted from a first combustion event of an engine start from rest, fueling an engine with each of port and direct injection;
- and
- maintaining a ratio of fuel injected via port injection relative to direct injection over the first number of combustion events even as fuel mass changes.
An engine method, comprising:
- over a number of combustion events occurring consecutively since a first combustion event of a first engine start from rest, maintaining a ratio of fuel delivered via port injection relative to direct injection as a commanded fuel mass decreases;
- and
- over the number of combustion events occurring consecutively since the first combustion event of a second engine start from rest, adjusting the ratio of fuel directed via port injection relative to direct injection while maintaining actual fuel mass at the commanded fuel mass as the commanded fuel mass decreases.
An engine fuel system, comprising:
- an engine cylinder;
- a direct injector coupled to the cylinder;
- a port injector coupled to the cylinder;
- and
- a controller with computer readable instructions stored on non-transitory memory for:
- restarting an engine with fuel delivered into the cylinder on a first combustion event from rest from each of the port injector and the direct injector at a ratio;
- adjusting a fuel mass commanded to the cylinder based on a combustion event number since the first combustion event until a threshold number of combustion events have elapsed;
- when a commanded decrease in fuel mass is received within a threshold number of crank angle degrees of a port injection window, adjusting each of a port injection fuel pulse and a direct injection fuel pulse to provide the commanded decrease in fuel mass while adjusting the ratio;
- and
- when the commanded decrease in fuel mass is received outside the threshold number of crank angle degrees of the port injection window, maintaining each of the port injection fuel pulse and the direct injection fuel pulse to maintain the ratio while providing an actual fuel mass that is higher than a commanded fuel mass.
7 more elements
Dependencies are inferred from the claim text.