Title:
排気温度測定装置
Document Type and Number:
Japanese Patent JP4385423
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain an exhaust gas temperature measuring apparatus employing an air/fuel ratio sensor in order to eliminate a temperature sensor in view point of cost in which the exhaust gas temperature can be measured accurately without limiting the measurement conditions. SOLUTION: In an operating region where conduction to the heater in an air/fuel ratio sensor is not required, exhaust gas temperature is estimated by measuring the element impedance of the air/fuel ratio sensor. In an operating region where conduction to the heater is effected, element temperature drops when conduction to the heater is cut for a predetermined time Δt1 and the element impedance increases. Since increment ΔZ of the element impedance increases as the exhaust gas temperature decreases, exhaust gas temperature can be estimated by measuring ΔZ. Alternatively, exhaust gas temperature may be estimated based on the time Δt2 required for the element impedance increases to be reset to a value before conduction cut after conduction is resumed following to conduction cut.
Inventors:
Naohide Izumiya
Keiichiro Aoki
Shinsuke Inagaki
Keiichiro Aoki
Shinsuke Inagaki
Application Number:
JP2742099A
Publication Date:
December 16, 2009
Filing Date:
February 04, 1999
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
G01K7/26; G01N27/41; F02D45/00
Domestic Patent References:
| JP4024657B2 | ||||
| JP9292364A | ||||
| JP10221182A |
Attorney, Agent or Firm:
Takashi Ishida
Shigeru Tsuchiya
Toshio Toda
Masaya Nishiyama
Shigeru Tsuchiya
Toshio Toda
Masaya Nishiyama