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. 24, 2017
Filed:
Feb. 20, 2014
Mitsubishi Heavy Industries, Ltd., Tokyo, JP;
Hajime Suzuki, Tokyo, JP;
Mitsubishi Heavy Industries, Ltd., Tokyo, JP;
Abstract
An object is to provide an exhaust-gas control device for a gas engine whereby NOx is reduced and fuel consumption is improved by performing NOx restriction operation when an environmental or geographical condition in which the amount of NOx emission needs to be temporarily restricted is satisfied, and otherwise performing stable operation focusing on the fuel consumption. The exhaust-gas control device for a gas engine includes: a basic operation mode unit () using the first target ignition timing and the first target air-fuel rate at which the fuel consumption rate is the optimum; a low-NOx operation mode unit () using the second target ignition timing retarded from the first target ignition timing and the second target air-fuel rate increased from the first target air-fuel rate; a NOx reduction demand determination unit () for determining whether to restrict the amount of NOx emission temporarily, and an switching unit to operation mode () for switching the operation mode to the low NOx operation mode while the reduction demand condition is satisfied by the NOx reduction demand determination unit.