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:
Oct. 20, 2020
Filed:
Jun. 29, 2018
Ngk Spark Plug Co., Ltd., Nagoya, JP;
Shinya Miyamoto, Niwa-gun, JP;
Yoshihiro Nakano, Komaki, JP;
NGK Spark Plug Co., LTD., Nagoya, JP;
Abstract
A microcomputer calculates the concentration of ammonia contained in exhaust gas. The microcomputer repeatedly obtains from a first ammonia detection section a first ammonia electromotive force EMF1 whose value changes with both the concentrations of ammonia and a flammable gas contained in the exhaust gas. The microcomputer outputs, as ammonia concentration information at the present point in time, ammonia concentration information representing the ammonia concentration at the point 0.5 sec prior to the present point in time. The microcomputer sets a rich spike flag Fs when a first ammonia electromotive force change amount ΔEMF1 is smaller than a value obtained by multiplying a start determination value by −1. When the rich spike flag Fs is set, the microcomputer sets the ammonia concentration information at the present point in time to the value of the ammonia concentration information at the point immediately before the rich spike flag Fs is set.