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:
Oct. 19, 1999
Filed:
Nov. 14, 1997
Shoichi Sakai, Gunma, JP;
Akira Uchikawa, Gunma, JP;
Unisia Jecs Corporation, Atsugi, JP;
Abstract
A system for estimating the temperature of an oxygen sensor installed in an exhaust system of an engine comprises a section for sensing a load of the engine; a section for sensing a rotation speed of the engine; and a section which, based on both the engine load and the engine rotation speed, calculates a basic estimated temperature of the oxygen sensor which would appear under a normal condition. A section is employed which senses a speed of the vehicle. A section is employed which, based on the vehicle speed, determines a first correction factor for correcting the basic estimated temperature. A section is employed which senses the temperature of outside air. A section is employed which, based on the outside air temperature, determines a second correction factor for correcting the basic estimated temperature. A target estimated temperature calculating section is employed which, based on the basic estimated temperature and the first and second correction factors, calculates a target estimated temperature of the oxygen sensor and issues an output signal representative of the target estimated temperature. A stopper section is further employed which suppresses the target estimated temperature calculating section from issuing the output signal or calculating the target estimated temperature until a predetermined time passes from a time on which energization of the electric heater starts.