US 2016/0097694 A1Published application

Determining cylinder health in a reciprocating piston engine

AssigneeDeere & Company

InventorsGeorge P. Lysenko, Kevin A. Price, Kyle M. Krisher

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Abstract

Computer-implemented methods, computer program products, and computer systems are described for determining cylinder health characteristic in a reciprocating piston engine of the type including a piston-cylinder assembly and a crankshaft. The piston-cylinder assembly includes a cylinder and a piston configured to translate within the cylinder as the crankshaft rotates. In one embodiment, the computer-implemented method includes rotating the crankshaft in a first direction, while generating a first data set comprising a first plurality of piston position measurements and corresponding pressure indicator measurements. The crankshaft is further rotated in a second opposing direction, while a second data set is generated comprising a second plurality of piston position measurements and corresponding pressure indicator measurements. A symmetric aspect between the first and second data sets is then identified and utilized to determining a cylinder health characteristic for the piston-cylinder assembly.

Claims20

Dependent claims

A computer-implemented method of determining a leakage characteristic associated with one or more cylinders in which one or more pistons are configured to move cyclical motion, the computer-implemented method comprising:

progressing a piston in a first direction, along a first piston stroke included in the cyclical motion, toward an expected top dead center position of the piston;
determining, by one or more computing devices, as part of a first data set, a plurality of first positions of the piston as the piston is progressed in the first direction along the first piston stroke;
determining, by the one or more computing devices, as part of the first data set, a plurality of first pressure indicators corresponding to the plurality of first positions;
progressing the piston in a second direction, along a second piston stroke included in the cyclical motion, toward the expected top dead center position of the piston;
determining, by one or more computing devices, as part of a second data set, a plurality of second positions of the piston as the piston is progressed in the second direction along the second piston stroke;
determining, by the one or more computing devices, as part of the second data set, a plurality of second pressure indicators corresponding to the plurality of second positions;
determining, by the one or more computing devices, one or more first symmetric aspects of the first data set with respect to the second data set;
and
determining, by the one or more computing devices, a leakage characteristic associated with the one or more cylinders based at least in part upon the determined one or more first symmetric aspects.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/970,110Filed 15 Dec 2015
Priority: 22 Jan 2014
Published: 7 Apr 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

G01M 3/025
By using fluid or vacuum: details with respect to the testing of engines or engine parts
F02D 35/023
On interior conditions: by determining the cylinder pressure
G01M 15/06
Testing internal-combustion engines: by monitoring positions of pistons or cranks
G01M 15/08
Testing internal-combustion engines: by monitoring pressure in cylinders

Family

Application14/161,446Continuation in part · filed 22 Jan 2014
Application14/970,110Continuation in part
US 2015/0204252 A1Published application
US 9,243,571 B2Related patent
US 9,562,823 B2Related patent
US 2016/0097694 A1This patent

From the US filing history. Foreign family members aren’t listed.