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:
Nov. 10, 2009
Filed:
Apr. 16, 2008
Tomoo Kawase, Aichi-ken, JP;
Eiichi Kurokawa, Okazaki, JP;
Katsuhiko Nakabayashi, Handa, JP;
Takahito Masuko, Anjo, JP;
Koji Sugiura, Kariya, JP;
Tomoo Kawase, Aichi-ken, JP;
Eiichi Kurokawa, Okazaki, JP;
Katsuhiko Nakabayashi, Handa, JP;
Takahito Masuko, Anjo, JP;
Koji Sugiura, Kariya, JP;
Denso Corporation, Kariya, JP;
Abstract
A correction apparatus for correcting an output of an oxygen sensor installed in an exhaust pipe of an internal combustion engine to measure the concentration of oxygen contained in exhaust gas. The apparatus works to execute a fuel cut operation to bring the pressure in the exhaust pipe to the atmospheric pressure and enters an under-atmosphere correction mode to sample an output of the oxygen sensor and determine a correction factor compensating for a deviation of the sampled output from a reference value representing an actual concentration of oxygen. The apparatus also works to calculate the pressure in the exhaust pipe after start of the fuel cut and determine whether the under-atmosphere correction mode is to be entered or not based on the pressure of exhaust gas, thereby ensuring the accuracy in correcting the output of the oxygen sensor regardless of a variation in the pressure of exhaust gas.