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:
Mar. 01, 2005
Filed:
Sep. 02, 2003
Shinya Igarashi, Naka-machi, JP;
Atsushi Kanke, Hitachi, JP;
Rintarou Minamitani, Tsukuba, JP;
Keiichi Nakada, Hitachinaka, JP;
Izumi Watanabe, Hitachinaka, JP;
Shinya Igarashi, Naka-machi, JP;
Atsushi Kanke, Hitachi, JP;
Rintarou Minamitani, Tsukuba, JP;
Keiichi Nakada, Hitachinaka, JP;
Izumi Watanabe, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Car Engineering Co., Ltd., Hitachinaka, JP;
Abstract
To offer a mass airflow measuring apparatus in which the effect of the adhesion onto the heating resistor caused while the engine is off is reduced and the measuring accuracy is improved. The apparatus measures the mass airflow of the air sucked into the internal combustion engine, using the heating resistorThe power control circuitmaintains the heating resistortemperature equal to or higher than the temperature during the operation of the internal combustion engine after the internal combustion engine has stopped and until the temperature of the internal combustion engine and its apparatuses installed in the suction system has lowered below the generation temperature of volatile gas such as oil vapor. The power control circuitusing the temperature sensing resistorthat detects the temperature of the air sucked into the combustion engine, detects the air temperature and maintains the heating resistortemperature, based on the temperature measured, equal to or higher than the temperature during the operation of the internal combustion engine even after the internal combustion engine has stopped.