发明名称 |
COMBUSTIBLE GAS DETECTION DEVICE |
摘要 |
A combustible gas detection device includes an energization control circuit which performs a control operation of switching the state of energization of a heat generation resistor every time a predetermined period of time elapses such that the heat generation resistor alternately has resistances corresponding to two set temperatures set in advance, a temperature measurement resistor which is disposed on the same substrate on which the heat generation resistor is disposed and the resistance of which changes with the environmental temperature, a gas concentration computation section which calculates the concentration of a combustible gas by using a voltage generated across the heat generation resistor which is detected when electricity is supplied to the heat generation resistor and the environmental temperature based on a voltage change which occurs as a result of a change in the resistance of the temperature measurement resistor. The period of time has a length determined in advance such that a change in the environmental temperature which occurs when the energization control circuit switches the state of energization of the heat generation resistor falls within a range of 0.5°C. |
申请公布号 |
EP2674750(A1) |
申请公布日期 |
2013.12.18 |
申请号 |
EP20120744448 |
申请日期 |
2012.02.09 |
申请人 |
NGK SPARK PLUG CO., LTD. |
发明人 |
WATANABE, MASAYA;KITANOYA, SHOJI;ICHIKAWA, DAISUKE;YAMASHITA, MASAHIRO |
分类号 |
G01N27/18;G01N25/18 |
主分类号 |
G01N27/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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