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Title:
TEMPERATURE CONTROL DEVICE FOR EXHAUST GAS SENSOR AND TEMPERATURE CONTROL METHOD FOR THE SENSOR
Document Type and Number:
WIPO Patent Application WO/2003/083464
Kind Code:
A1
Abstract:
The temperature of exhaust gas flowing through an exhaust gas passage (3) is estimated or measured and the temperature of an element portion of an exhaust gas sensor (8) (O2 sensor) is controlled through a heater to a desired target temperature using the estimated or measured value. The exhaust gas passage (3) leading to the sensor (8) is partitioned into partial exhaust gas passages (3a-3d), and the exhaust gas temperatures in the partial exhaust gas passages (3a-3d) are estimated in sequence starting with an exhaust port (2) side of an engine (1). The estimation of the exhaust gas temperature is performed based on heat transmission between the exhaust gas and passage-forming members (6a, 6b, 7) of the exhaust gas passage (3) by an algorithm where heat radiation into the air is considered. A control input to the heater at least include a component corresponding to the temperature of the element portion and a component corresponding to the exhaust gas temperature. The temperature of the element portion of the exhaust gas sensor can be controlled stably to a desired temperature even if the exhaust gas temperature changes.

More Like This:
WO/1996/026434ARRANGEMENT FOR ANALYSIS OF EXHAUST GASES
JP4180215Gas sensor
Inventors:
YASUI YUJI
IWAKI YOSHIHISA
Application Number:
PCT/JP2003/003957
Publication Date:
October 09, 2003
Filing Date:
March 28, 2003
Export Citation:
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Assignee:
HONDA MOTOR CO LTD (JP)
International Classes:
G01N27/409; F02D41/14; F02D45/00; G01N27/406; G05D23/19; G05D23/24; G05D23/27; (IPC1-7): G01N27/409; F02D41/14; G01N27/41; G01N27/419
Foreign References:
JPS6134469U1986-03-03
JPH01172745A1989-07-07
JP2000249677A2000-09-14
JPS6072561U1985-05-22
JP2003065999A2003-03-05
JPH07167830A1995-07-04
JPH08278279A1996-10-22
JP2003097323A2003-04-03
JP2001324469A2001-11-22
JPH1010074A1998-01-16
JP2000292407A2000-10-20
Other References:
See also references of EP 1475631A4
Attorney, Agent or Firm:
Sato, Tatsuhiko (Yoyogi 2-chome Shibuya-ku, Tokyo, JP)
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