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:
Nov. 20, 2001
Filed:
Dec. 18, 1998
Kenji Ohta, Hitachinaka, JP;
Atsushi Kanke, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a heating resistor type air flow measurement apparatus, flow correction data are read out from a primary memory and stored in a secondary memory, and then an air flow signal is calibrated by the flow correction data stored in the secondary memory when starting the apparatus up. The apparatus has a diagnosis unit, for determining whether or not the flow correction data stored in the primary memory are correct, so that the determination processing of the flow correction data by the diagnosis unit is performed at any time at least including the starting-up point of the apparatus. There is no fear that engine control based on abnormal flow correction data will continue.