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:
Jan. 30, 2007
Filed:
May. 27, 2005
Masuo Akamatsu, Chiyoda-ku, JP;
Masuo Akamatsu, Chiyoda-ku, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a heating resistor type air flow meter, a temperature characteristic of an air flow rate signal whose output value varies with temperature of the air flow meter circuitry is compensated by the temperature characteristic compensation circuit. The compensation circuit produces a temperature characteristic signal for compensation which changes in response to changes in an ambient temperature, and converts this signal into a predetermined proportional signal. The predetermined proportional signal is added to the air flow rate signal and such an addition result signal is input to the output control circuit and the temperature characteristic of the air flow rate signal is compensated. The resistors for proportional adjustment are external to and connected through a terminal to the IC of the air flow meter.