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:
Feb. 11, 2014
Filed:
Apr. 20, 2011
Yusuke Kawamura, Susono, JP;
Takuya Matsumoto, Miyoshi, JP;
Takashi Nakamura, Toyota, JP;
Makoto Sato, Miyoshi, JP;
Toru Kidokoro, Hadano, JP;
Hiroshi Sawada, Gotenba, JP;
Yasushi Iwazaki, Ebina, JP;
Yusuke Kawamura, Susono, JP;
Takuya Matsumoto, Miyoshi, JP;
Takashi Nakamura, Toyota, JP;
Makoto Sato, Miyoshi, JP;
Toru Kidokoro, Hadano, JP;
Hiroshi Sawada, Gotenba, JP;
Yasushi Iwazaki, Ebina, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
The fact that 'with respect to a process in which the output value of a downstream air-fuel ratio sensor (sensor output value) is inverted from the minimum output value to the maximum output value during execution of an active control, the local maximum and minimum values of the secondary differential value of the sensor output value is widely affected by the size of the response delay of the downstream air-fuel ratio sensor and the size of the degree of the degradation of the three-way catalyst' is utilized. By preliminarily acquiring and memorizing, as maps, these relations obtained through an experiment, and applying the 'local maximum and minimum values of the secondary differential value of the sensor output value' calculated from the transition of the sensor output value acquired during execution of the active control to the maps, the response delay (time constant) of the downstream air-fuel ratio sensor is acquired.