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:
Dec. 05, 2000
Filed:
Nov. 25, 1998
Kousaku Shimada, Hitachinaka, JP;
Takeshi Atago, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A control apparatus for an engine includes a burn mode determining unit for determining a stoichiometric burn mode or a lean burn mode, and a stratified charge burn mode or a homogeneous charge burn mode. A target A/F calculating unit calculates a target A/F according to the operational point of the engine and a phase lag filter changes the phase of said calculated target A/F. A first target A/F modifying unit modifies the target A/F whose phase is delayed, so that an unstable burn region is avoided and a second target A/F modifying unit further modifies the modified target A/F during a transitional period when the operation is switched so as to avoid the unstable region. A target A/F selecting unit selects one of the modified A/F modified by the first target A/F modifying unit and the target A/F modified by the second A/F modifying unit.