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:
Jan. 20, 2026
Filed:
Feb. 10, 2025
Mazda Motor Corporation, Hiroshima, JP;
Yuki Matsumoto, Hiroshima, JP;
Hiroshi Yamada, Hiroshima, JP;
Nozomi Yasui, Hiroshima, JP;
Koichiro Harada, Hiroshima, JP;
Mazda Motor Corporation, Hiroshima, JP;
Abstract
An exhaust purification device includes: a filter including an oxygen storage capacity (OSC) material; a secondary air supply passage connected to the exhaust passage upstream of the filter; a secondary air control valve disposed in the secondary air supply passage and configured to provide periodicity to secondary air supplied to the secondary air supply passage; and an engine control unit (ECU), wherein the ECU controls the secondary air control valve so as to supply the secondary air with a predetermined frequency and a maximum amplitude of an oxygen concentration. The secondary air control valve is controlled so that when the frequency of the secondary air is fixed to a value of greater than 0 Hz and less than or equal to 1.5 Hz, the maximum amplitude of the oxygen concentration is greater than 0.50% and less than or equal to 3.0%.