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:
Jul. 15, 1997
Filed:
Nov. 14, 1995
Kazunori Katoh, Anjo, JP;
Haruyoshi Kondo, Anjo, JP;
Masayuki Matsui, Toyoake, JP;
Naoki Katayama, Nagoya, JP;
Yasushi Yamada, Nishikamo-gun, JP;
Hideaki Takahashi, Nisshin, JP;
Kunio Fukuda, Nagoya, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi-ken, JP;
Kabushiki Kaisha Toyota Chuo Kenkyusho, Aichi-ken, JP;
Abstract
An apparatus for analyzing air/fuel ratio sensor characteristics makes it possible to perform highly accurate analysis of the characteristics of an air/fuel ratio sensor to be measured. The apparatus comprises a sensor attachment means in which is mounted an air/fuel ratio sensor to be measured; a gas regulation means for supplying to the sensor attachment means a gas that is substantially equivalent to components of exhaust gases from an engine, or some components thereof; a control means for comparing an output from the air/fuel ratio sensor to be measured mounted in the sensor attachment means and an output from a reference stoichiometric air/fuel ratio sensor at the stoichiometric air/fuel ratio of the engine, to obtain a deviation therebetween and to obtain from a history of this deviation over time the composition and flow rate of gases to be controlled to compensate for this deviation, and issuing appropriate instructions to the gas regulation means; and an air/ratio measurement means for measuring a time average of the thus controlled air/fuel ratio.