The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 22, 2019
Filed:
Dec. 01, 2016
GM Global Technology Operations Llc, Detroit, MI (US);
Paul Leonardo Claude, Turin, IT;
Serena Tordin, Settimo Torinese, IT;
GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US);
Abstract
A method and apparatus is disclosed for testing a fuel injector of an internal combustion engine equipped with a plurality of fuel injectors to detect injector clogging. A test injector is switched off. A requested value of a fuel quantity to be injected by the other fuel injectors of the plurality of fuel injectors is adjusted to operate the internal combustion engine in idle mode. A value of an oxygen concentration in an exhaust gas is measured. A value of a fuel quantity that has been injected is estimated as a function of the measured value of the oxygen concentration. A fuel quantity drift of each fuel injector is calculated as a function of the requested values and the estimated values of the fuel quantity provided by the injector tests. Each fuel quantity drift is used to identify if the corresponding fuel injector is clogged.