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:
Jan. 21, 1992
Filed:
Oct. 01, 1990
Hiroshi Matsuoka, Yamato, JP;
Isuzu Motors Limited, Tokyo, JP;
Abstract
The heat-insulating engine with swirl chamber of this invention injects fuel at a low pressure along the inner wall surface of swirl chambers having a heat-insulating structure by subsidiary nozzles opened and closed electrically, from the second half of an intake stroke to a compression stroke, and then injects mainly the fuel by main nozzles into the swirl chambers from the second half of the compression stroke to an expansion stroke. Atomization of the fuel from the subsidiary nozzles may be to such an extent that the fuel merely attaches to the wall surface; hence, the subsidiary nozzles can be of an accumulation type low pressure injection type. The fuel from the subsidiary nozzles is injected to the wall surface of the swirl chambers in the contact state so as to deprive the wall surface of the heat and thus to recover the heat. Main injection is effected following the sibsidiary injection and a rich mixture is generated inside the swirl chambers so as to restrict the generation of NOx and to improve cycle efficiency. It is possible to prevent a lean mixture from diffusing into cylinders. Since the fuel of subsidiary injection is caused to stay inside the swirl chambers, degradation of hydrocarbon components can be reduced.