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:
May. 03, 2011
Filed:
Mar. 10, 2009
Hiroshi Yamashita, Anjo, JP;
Hiroshi Yamashita, Anjo, JP;
Denso Corporation, Kariya, JP;
Abstract
While there occurs a steady operation state where an engine operation state (such as intake air quantity) is maintained substantially constant, a high-response intake air quantity sensor (referred to as the sensor, hereafter) is temporarily powered off and is powered on again when a predetermined time elapses after the power-off. An output rising characteristic of the sensor at the time when the sensor is powered on again is sensed and abnormality diagnosis of the sensor is performed based on the sensing value of the output rising characteristic During a power-off period, the engine operation state is controlled using a sensing value (a stored value) of the sensor immediately preceding the power-off. When an abnormality of the sensor is detected, use of the sensor is prohibited and the intake air quantity is estimated based on intake pipe pressure and the like.