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. 09, 2014
Filed:
Apr. 02, 2013
Pao Chi Pien, Chevy Chase, MD (US);
Paul Shih-hsi Pien, Bethesda, MD (US);
Pao Chi Pien, Chevy Chase, MD (US);
Paul Shih-Hsi Pien, Bethesda, MD (US);
Other;
Abstract
A compression-ignition constant-volume constant-temperature combustion reciprocating internal combustion engine can operate with a first combustion stage and a second combustion stage. The first combustion stage can be configured to occur at about constant-volume, where a quantity of a first heat addition can be selected to ensure that a first combustion temperature during the first combustion stage does not exceed a threshold temperature at which NOx formation occurs. The second combustion stage can be configured to occur at about a second combustion temperature that remains about constant during the second combustion stage, where the second combustion temperature can be about equal to the first combustion temperature at an end of the first combustion stage, and where a quantity and a rate of a second heat addition delivered to the engine during the second combustion stage can be configured to ensure that the second combustion temperature of the second combustion stage remains about constant during the expansion stroke even as cylinder pressure decreases.