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:
Mar. 27, 2018
Filed:
Aug. 10, 2016
GM Global Technology Operations Llc, Detroit, MI (US);
Raffaello Ardanese, Bloomfield Hills, MI (US);
Giovanni David, Turin, IT;
Luciano Nunziato Di Perna, Troy, MI (US);
Pablo E Hernandez Garcia, Royal Oak, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A method for controlling an exhaust after-treatment system connected to a diesel engine via a gas passage and having a diesel oxidation catalyst (DOC) and a 'diesel-exhaust-fluid' (DEF) injector arranged downstream of the DOC and upstream of a selective catalytic reduction catalyst (SCR) includes detecting a flow of exhaust gas emitted by the engine into the gas passage. The method also includes detecting a level of nitrogen oxides (NO) in the exhaust gas downstream of the SCR. The method additionally includes activating the DEF injector for a period of time to reduce the level of NOto a predetermined NOvalue. Furthermore, the method includes regulating an injection of fuel upstream of the DOC to clean the DEF injector via a stream of superheated exhaust gas if the period of time used to reduce the level of NOto the predetermined NOvalue is greater than a predetermined threshold value.