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:
Feb. 03, 2009
Filed:
Mar. 28, 2007
Mitsuo Hitomi, Fuchu-cho, JP;
Noriyuki Iwata, Fuchu-cho, JP;
Masahisa Yamakawa, Fuchu-cho, JP;
Toshiaki Nishimoto, Fuchu-cho, JP;
Takashi Yohso, Fuchu-cho, JP;
Takayoshi Hayashi, Fuchu-cho, JP;
Mitsuo Hitomi, Fuchu-cho, JP;
Noriyuki Iwata, Fuchu-cho, JP;
Masahisa Yamakawa, Fuchu-cho, JP;
Toshiaki Nishimoto, Fuchu-cho, JP;
Takashi Yohso, Fuchu-cho, JP;
Takayoshi Hayashi, Fuchu-cho, JP;
Mazda Motor Corporation, , JP;
Abstract
Disclosed is a spark-ignition gasoline engine, which comprises control means operable, when an engine operation zone is a high-load operation zone including a WOT region within at least a low speed range, to adjust a closing timing of an intake valve in such a manner as to maintain an effective compression ratio at 13 or more, and retard an ignition timing to a point within a predetermined stroke range just after a top dead center of a compression stroke, wherein the effective compression ratio is calculated based on an intake-valve closing timing defined by a valve lift amount of 1 mm. The present invention can provide a spark-ignition gasoline engine having both a low-cost performance and a high engine-power performance even in a high-load operation zone (particularly WOT region) in a low speed range.