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:
Nov. 13, 2018
Filed:
Apr. 10, 2017
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, Aichi-ken, JP;
Yoshihisa Serizawa, Shizuoka-ken, JP;
Keiichiro Aoki, Shizuoka-ken, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, JP;
Abstract
A nitrogen oxide sensor includes a measured gas chamber, a sensor cell, a pump cell, a voltage application circuit, a sensor output detector, a voltage control part, a concentration calculation part, a temperature estimation part, an air-fuel ratio estimation part, and a time calculation part calculating a cumulative value of time periods when the temperature of the pump cell is within a predetermined temperature region and the air-fuel ratio of the measured gas is leaner than the stoichiometric air-fuel ratio as a first cumulative time period. The concentration calculation part calculates the NOx concentration in the measured gas higher with respect to the output of the sensor cell when the first cumulative time period is relatively long compared with when the first cumulative time period is relatively short.