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. 10, 1991
Filed:
Oct. 01, 1990
Hiroshi Matsuoka, Yamato, JP;
Isuzu Motors Limited, Tokyo, JP;
Abstract
In a heat-insulating swirl chamber engine, subsidiary fuel is injected from subsidiary nozzles along the inner wall surfaces of swirl chambers of a heat-insulating structure from the second half of an intake stroke to the first half of a compression stroke, so that a lean mixture formed in the swirl chambers does not diffuse into cylinders, deterioration of hydrocarbon components can be prevented and moreover, since the fuel comes into contact with the wall surfaces of the swirl chambers, heat energy can be recovered from the wall surfaces. Next, main fuel is injected from main nozzles into the swirl chambers from the second half of the compression stroke to the first half of an expansion stroke, so that the inside of the swirl chambers becomes fuel-rich due to the lean mixture formed in advance in the swirl chambers and the fuel by the main injection, combustion is effected in the fuel-rich state to restrict the generation of NOx and moreover, cycle efficiency can be improved because the main combustion period is shortened.