Title:
空燃比センサの制御装置
Document Type and Number:
Japanese Patent JP3587073
Kind Code:
B2
Abstract:
A control device for an air-fuel ratio sensor (1) for detecting, from an oxygen concentration detecting device (2), a current corresponding to a concentration of oxygen contained in a gas by applying a voltage to the oxygen concentration detecting device (2). The control device detects an alternating impedance of the oxygen concentration detecting device (2) corresponding to each frequency by applying alternating voltages of a plurality of frequencies to the oxygen concentration detecting device (2) and analyzing each of the alternating impedances detected by the impedance detecting means (10,20) so as to calculate a parameter indicating a change in the characteristic of the oxygen concentration detecting device (2), and thereby achieve control of the air-fuel ratio sensor (1).
Inventors:
Keiichiro Aoki
Application Number:
JP37454398A
Publication Date:
November 10, 2004
Filing Date:
December 28, 1998
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
G01N27/41; F02D41/14; F02D41/22; F02D45/00; G01N27/02; G01N27/26; (IPC1-7): G01N27/41; F02D41/22; F02D45/00; G01N27/02; G01N27/26
Domestic Patent References:
| JP57192851A | ||||
| JP57192854A | ||||
| JP57192852A |
Attorney, Agent or Firm:
Takashi Ishida
Shigeru Tsuchiya
Toshio Toda
Masaya Nishiyama
Shigeru Tsuchiya
Toshio Toda
Masaya Nishiyama