Multi-fuel engine system

Patent metadata

Field	Value
Publication number	US-10316772-B2
Application number	US-201514967062-A
Country	US
Kind code	B2
Filing date	Dec 11, 2015
Priority date	Dec 16, 2014
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

Abstract

Various methods and systems are provided for an engine capable of receiving liquid and gaseous fuel. In one example, cylinder misfire may be identified based on a misfire monitor. The misfire monitor may detect misfire based on signals from a crankshaft sensor.

First claim

The invention claimed is:

1. A system comprising:
an engine having a plurality of cylinders with pistons coupled to a crankshaft;
a crankshaft speed sensor; and
a controller having a processor and a memory holding non-transitory computer readable storage media, the controller configured to:
measure a half-order torsional vibration of the engine based on signals from the crankshaft speed sensor;
determine an amplitude of the half-order torsional vibration;
when the amplitude is greater than a threshold amplitude, indicate misfire in at least one of the plurality of cylinders;
responsive to misfire being indicated: determine which cylinder of the plurality of cylinders is misfiring based on a phase of the half-order torsional vibration; and increase a fuel injection amount to the misfiring cylinder;
determine a coefficient of variation (COV) of the plurality of cylinders based on the measured half-order torsional vibration; and
adjust fueling duration to one or more of the plurality of cylinders based on the COV.

2. The system of claim 1 , wherein the engine is configured to operate with at least a first fuel and a second fuel, and wherein to increase the fuel injection amount to the misfiring cylinder, the controller is configured to increase a fuel injection amount of the first fuel relative to the second fuel.

3. The system of claim 2 , wherein the first fuel is a liquid fuel and the second fuel is a gaseous fuel.

4. The system of claim 3 , wherein the controller is further configured to determine, for each cylinder of the plurality of cylinders, a misfire limit for each operating point of a plurality of operating points based on the amplitude of the half-order torsional vibration measured across the plurality of operating points.

5. The system of claim 4 , wherein the misfire limit for a given cylinder of the plurality of cylinders includes a minimum open duration for a liquid fuel injector coupled to the given cylinder.

6. The system of claim 5 , wherein the controller is further configured to operate each cylinder of the plurality of cylinders at a respective predetermined ratio of gaseous fuel to liquid fuel, each predetermined ratio including a maximum amount of gaseous fuel to deliver requested engine output while remaining above a respective misfire limit.

7. A method comprising, with a controller having a processor and a memory holding non-transitory computer readable storage media:
measuring a half-order torsional vibration of an engine based on signals from a crankshaft speed sensor, the engine having a plurality of cylinders with pistons coupled to a crankshaft;
determining an amplitude of the half-order torsional vibration;
when the amplitude is greater than a threshold amplitude, indicating misfire in at least one of the plurality of cylinders;
responsive to misfire being indicated: determining which cylinder of the plurality of cylinders is misfiring based on a phase of the half-order torsional vibration; and increasing a fuel injection amount to the misfiring cylinder;
determining a coefficient of variation (COV) of the plurality of cylinders based on the measured half-order torsional vibration; and
adjusting fueling duration to one or more of the plurality of cylinders based on the COV.

Assignees

• Gen Electric
• Ge Global Sourcing Llc

Inventors

• Flynn Paul Lloyd
• Bhattacharya Aninda
• Murugesan Ganesasubramanian
• Karunaratne Milan Palinda
• Cullen Daniel

Classifications

• F02D41/0025

  Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures · CPC title

• F02D41/008 Primary

  Controlling each cylinder individually · CPC title

• F02D41/1498

  measuring engine roughness · CPC title

• G01M15/11

  by detecting misfire · CPC title

• F02D2200/101

  Engine speed · CPC title