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:
Jun. 27, 1995
Filed:
Feb. 10, 1993
Frank W Hunt, Walled Lake, MI (US);
Masayoshi Kaneyasu, Farmington Hills, MI (US);
George Saikalis, West Bloomfield, MI (US);
Hitachi America, Ltd., Tarrytown, NY (US);
Abstract
An engine monitoring system and/or emission reduction system is provided for use in conjunction with an internal combustion engine. The system includes a plurality of sensors which detect various engine operating conditions and in which each sensor generates an output signal representative of its particular engine operating condition. At least one of these sensors is a gas sensor associated with the exhaust system which produces an output signal indicative of the concentration of nitric oxides in the exhaust emissions and which has an output which varies as a function of the concentration of such nitric oxides. A central processing unit receives inputs from the various engine sensors and, in accordance with preprogrammed algorithms, monitors the engine for failure and/or deterioration of various components in the emission reduction system as well as the various engine sensors. The processing unit further generates output signals which controls the operation of various engine components to optimize the operating condition of the engine as well as to meet governmental standards relating to engine emissions.