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. 02, 2014
Filed:
Jun. 26, 2013
Mitsubishi Electric Corporation, Chiyoda-ku, Tokyo, JP;
Yuji Ariyoshi, Chiyoda-ku, JP;
Masahiro Kawai, Chiyoda-ku, JP;
Koji Tanimoto, Chiyoda-ku, JP;
Kazuhiko Otsuka, Chiyoda-ku, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
A thermal air flow meter comprises: a bridge circuit unit that incorporates a bridge circuit including a heating resistor and supplies a current to the heating resistor so that the temperature of the resistor is always set higher by a predetermined temperature than the temperature of intake air detected by an intake-air temperature detection resistor, and outputs an output signal Vm based on the current value supplied to the heating resistor, in accordance with a flow rate of the intake air; a differential amplifier unit that amplifies a voltage dependent on difference in temperature between an upstream heating resistor and downstream heating resistor; and a subtraction processor that subtracts from the output signal Vm a constant times an output voltage Vd1 from the differential amplifier unit, and outputs a correction output signal Vout.