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:
Mar. 11, 1986
Filed:
Dec. 19, 1983
Yoji Hasegawa, Yokohama, JP;
Naomi Tokura, Yokosuka, JP;
Nissan Motor Company, Limited, Yokohama, JP;
Abstract
An exhaust passage extends from an internal combustion engine to conduct exhaust from the engine. A filter is disposed in the exhaust passage to filter particles out of the exhaust. A burner is disposed in the exhaust passage upstream of the filter to burn off the particles retained by the filter. A sensor senses the pressure across the filter and generates a signal indicative thereof. Another sensor senses an operating condition of the engine. A first device generates a primary reference signal on the basis of the sensed engine operating condition. A second device samples the pressure signal when the pressure sensor is subject to a zero pressure difference. A third device stores the sampled pressure signal. A fourth device corrects the primary reference signal on the basis of the stored pressure signal and generates a secondary reference signal reflecting the correction. A fifth device compares the pressure signal to the secondary reference signal and generates a signal reflecting the result of the comparison. A sixth device activates the burner on the basis of the comparison signal.