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:
Dec. 31, 2013
Filed:
Nov. 15, 2010
Ignazio Dentici, Turin, IT;
Ignazio Dentici, Turin, IT;
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A method is provided for controlling a Diesel Emission Fluid (DEF) injected quantity in a NOreduction system employing a Selective Catalytic Reduction (SCR) catalyst, and a DEF injector for injecting the DEF to reach said SCR catalyst. The method includes determining a required quantity of DEF for the SCR catalyst at a given time. If the required quantity of DEF is at least equal to a threshold quantity, then a DEF injection is activated, otherwise the required quantity of DEF is stored in memory of an Electronic Control Unit (ECU). After a period, a further required quantity of DEF to be added to the required quantity is determined to determine a new required quantity of DEF. The new required quantity of DEF is continuously updated until the new required quantity of DEF is at least equal to said threshold quantity, at which point the DEF injection of the new required quantity of DEF is activated.