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:
Aug. 28, 2018
Filed:
Feb. 28, 2017
GM Global Technology Operations Llc, Detroit, MI (US);
Mariano Nocereto, Turin, IT;
Luis Daniel Guerrero Cruz, Turin, IT;
Raffaello Ardanese, Bloomfield Hills, MI (US);
GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US);
Abstract
A method of monitoring the reductant delivery performance of a selective catalytic reduction component of a vehicle exhaust system, includes operating a diesel exhaust fluid pump until a reductant delivery performance pressure setpoint is reached. Calculating an average pump duty cycle and commanding the calculated pump duty cycle to be used in the open loop control phase. Calculating an initial average pressure. Injecting a controlled diesel exhaust fluid (DEF). Calculating a final average pressure. Calculating a pressure drop ΔP and determining if the calculated pressure drop ΔP is less than an expected pressure drop calculated as a function of the average pump duty cycle.