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:
Mar. 02, 2021
Filed:
Mar. 19, 2018
Mazda Motor Corporation, Hiroshima, JP;
Takano Nakai, Hiroshima, JP;
Takaya Okugawa, Hiroshima, JP;
Souichirou Chabata, Aki-gun, JP;
Takafumi Nishio, Otake, JP;
MAZDA MOTOR CORPORATION, Hiroshima, JP;
Abstract
A control device for an engine includes a valve-stopping mechanismwhich holds intake and exhaust valvesof the first and the fourth cylinders (idle cylinders) of four cylinders in closed states, a throttle valve control unit, an ignition period control unit, and an ECUwhich controls the valve-stopping mechanism, the throttle valve control unit, and the ignition period control unit. The ECUsets a retard amount of the ignition period of the idle cylinder behind the basic ignition period at least in starting the all-cylinder operation in accordance with an amount of burned gas existing in the idle cylinder in switching to the all-cylinder operation from the reduced-cylinder operation.