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:
Sep. 08, 2020
Filed:
May. 13, 2019
Mazda Motor Corporation, Aki-gun, Hiroshima, JP;
Masanari Sueoka, Hiroshima, JP;
Atsushi Inoue, Aki-gun, JP;
Keiji Maruyama, Hiroshima, JP;
Takuya Ohura, Hiroshima, JP;
Tomohiro Nishida, Hiroshima, JP;
Yusuke Kawai, Hiroshima, JP;
Tetsuya Chikada, Higashihiroshima, JP;
Masatoshi Hidaka, Higashihiroshima, JP;
Toshiaki Takahashi, Hiroshima, JP;
Tatsuhiro Tokunaga, Aki-gun, JP;
Mazda Motor Corporation, Aki-gun, Hiroshima, JP;
Abstract
A method of implementing control logic of a compression-ignition engine is provided. A controller outputs a signal to a injector and a variable valve operating mechanism so that a gas-fuel ratio (G/F) becomes leaner than a stoichiometric air fuel ratio, and an air-fuel ratio (A/F) becomes equal to or richer than the stoichiometric air fuel ratio, and to an ignition plug so that unburnt mixture gas combusts by self-ignition after the ignition plug ignites mixture gas inside a combustion chamber. The method includes steps of determining a geometric compression ratio and determining the control logic defining an intake valve close timing IVC. IVC (deg.aBDC) is determined so that the following expression is satisfied: if the geometric compression ratio ε is 10≤ε<17,0.4234ε−22.926ε+207.84++22.926ε−167.84+where C is a correction term according to an engine speed NE (rpm),−1.0×10+7.0×10