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:
Jun. 24, 2025
Filed:
Sep. 06, 2023
GM Global Technology Operations Llc, Detroit, MI (US);
Yuntao Gu, Farmington Hills, MI (US);
Patrick G. Szymkowicz, Shelby Township, MI (US);
Wei Li, Troy, MI (US);
Calvin Thomas, Royal Oak, MI (US);
Mingjie Tu, Sterling Heights, MI (US);
GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US);
Abstract
An exhaust gas treatment system including: an internal combustion engine comprising an exhaust gas outlet; a first three way catalyst downstream of the exhaust gas outlet, wherein the first three way catalyst receives an exhaust output from the exhaust gas outlet; a hydrocarbon trap downstream of the first three way catalyst, wherein the hydrocarbon trap receives an exhaust output from the first three way catalyst; an exhaust heating unit downstream of the hydrocarbon trap, wherein the exhaust heating unit receives an exhaust output from the hydrocarbon trap; and a second three way catalyst downstream of the exhaust heating unit, wherein the second three way catalyst receives an exhaust output from the heating unit, wherein an air injection port is configured to selectively deliver a stream of air upstream of the hydrocarbon trap and downstream of the first three way catalyst.