CATALYTIC COMBUSTION TYPE GAS SENSOR

Title:

CATALYTIC COMBUSTION TYPE GAS SENSOR

Document Type and Number:

WIPO Patent Application WO/2011/145492

Kind Code:

A1

Abstract:

Provided is a catalytic combustion type gas sensor in which the temperature and the electrical resistance of a catalyst metal are increased by combustion heat generated when a combustible gas burns upon contact with the catalyst metal that has been heated by voltage application, and in which the combustible gas present in a given or higher concentration is detected based on the increase in electrical resistance. In the sensor, a voltage is applied to the catalyst metal (detection element) so that the catalyst metal has a standby temperature, which is obtained by subtracting the temperature increase caused by combustion heat generated when the combustible gas present in a given concentration burns upon contact with the catalyst metal (detection element) from a desorption temperature at which an adsorbate that has been adsorbed onto the catalyst metal through silicon (Si) poisoning is desorbed. The desorption temperature is set to a temperature in the range of 350-600ºC, excluding 350ºC. When the sensor is switched on and/or switched off, a voltage is applied to the catalyst metal (detection element) so that the catalyst metal (detection element) is heated to a temperature in the range of 350-600ºC. Thus, the catalytic combustion type gas sensor can be inhibited from deteriorating in detection sensitivity.

Inventors:

OKAJIMA KAZUHIRO (JP)
OISHI HIDETOSHI (JP)
TSUKABAYASHI SHUNJI (JP)
SUZUKI AKIHIRO (JP)
MURAKAMI NOBUAKI (JP)
MORIMOTO SATOSHI (JP)
KODA HIROSHI (JP)
MATSUMOTO TAKASHI (JP)

Application Number:

PCT/JP2011/060825

Publication Date:

November 24, 2011

Filing Date:

May 11, 2011

Export Citation:

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Assignee:

HONDA MOTOR CO LTD (JP)
FIS INC (JP)
OKAJIMA KAZUHIRO (JP)
OISHI HIDETOSHI (JP)
TSUKABAYASHI SHUNJI (JP)
SUZUKI AKIHIRO (JP)
MURAKAMI NOBUAKI (JP)
MORIMOTO SATOSHI (JP)
KODA HIROSHI (JP)
MATSUMOTO TAKASHI (JP)

International Classes:

G01N27/16

Domestic Patent References:

WO2007099933A1

2007-09-07

Foreign References:

JP2010078609A	2010-04-08
JP2007232406A	2007-09-13
JP2004020377A	2004-01-22

Other References: