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:
Dec. 16, 1997
Filed:
Sep. 18, 1996
Koichi Mizutani, Toyota, JP;
Keisuke Ikari, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi-Ken, JP;
Abstract
An apparatus for detecting a malfunction in an intake pressure sensor of an engine includes a first detecting unit which detects a flow rate of intake air of the engine. A second detecting unit detects an engine speed of the engine. An intake pressure estimating unit determines an intake-air specific flow rate from the intake-air flow rate and the engine speed and determines characteristic values for the intake-air specific flow rate, the characteristic values being representative of an allowable range of intake pressure of the engine for the intake-air specific flow rate. A malfunction determining unit detects whether a malfunction in the intake pressure sensor has occurred, by comparing a signal output by the intake pressure sensor with the characteristic values determined by the intake pressure estimating unit.