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Gas sensor

a gas sensor and sensor technology, applied in the field of gas sensors, can solve the problems etc., and achieve the effects of reducing the possibility of gas sensor cracking, and reducing the time to reach the operating temperatur

Inactive Publication Date: 2020-04-16
NGK INSULATORS LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to solve the problem of gas sensors cracking due to water spraying. The invention provides a method to heat a gas sensor faster to its operating temperature without causing cracking. The controller of the gas sensor determines the temperature at which cracking occurs and controls the electric power supplied to the resistance heating element accordingly. A porous protective film is also included to make it harder for cracking to occur even at high water spraying amounts. The technical effect of the invention is to ensure the gas sensor reaches its operating temperature faster without causing cracking.

Problems solved by technology

However, if condensate water is present in a piping, cracking may occur in the gas sensor during a temperature rise due to an influence of the condensate water.

Method used

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Embodiment Construction

[0026]An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view of a gas sensor 100 according to an embodiment of the present invention. FIG. 2 is a schematic perspective view illustrating an example of configuration of a sensor element 101. FIG. 3 is a sectional view taken along A-A in FIG. 2. FIG. 4 is a block diagram illustrating an example of a control device 90. A structure of the gas sensor 100, illustrated in FIG. 1, is known and disclosed in, for example, Japanese Unexamined Patent Application Publication No. 2012-210637.

[0027]The gas sensor 100 includes the sensor element 101, a protective cover 110 covering one end (lower end in FIG. 1) of the sensor element 101 in a longitudinal direction and protecting the sensor element 101, an element sealing body 120 fixedly holding the sensor element 101 in a sealed state, and a nut 130 attached to the element sealing body 120. The gas sensor 100 is attached, fo...

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Abstract

A gas sensor includes a solid electrolyte layer with oxygen ion conductivity, a gas flow portion (ranging from a gas inlet port to a second inner cavity), a particular gas detector (including a main pump cell, a measurement pump cell, an auxiliary pump cell, etc.), and a control device. Prior to startup of the gas sensor, the control device sets electric power supplied to a heater such that a temperature difference between a temperature of the heater and a preset target temperature becomes zero, and determines, on the basis of the set electric power, whether temperature raising control of supplying the set electric power to the heater is to be executed.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]The present application claims priority of Japanese Patent Application No. 2018-192038 filed on Oct. 10, 2018, the entire contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION1. Field of the Invention[0002]The present invention relates to a gas sensor.2. Description of the Related Art[0003]There has hitherto been known a gas sensor including a sensor element that detects concentrations of predetermined gases, such as NOx and oxygen, contained in measurement object gas, for example, automobile exhaust gas (see Patent Literature (PTL) 1). Recently, the necessity of starting up the above-mentioned gas sensor as early as possible has increased with tighter regulations on the exhaust gas.CITATION LISTPatent Literature[0004]PTL 1: Japanese Unexamined Patent Application Publication No. 2016-109685SUMMARY OF THE INVENTION[0005]In trying to start up the gas sensor at an earlier timing, the gas sensor is first heated to ...

Claims

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Application Information

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IPC IPC(8): G01N27/406G01N27/407
CPCG01N27/407G01N27/4067G01N27/4074G01N27/4072G01N27/4071
Inventor ONISHI, RYOKOJIMA, YASUHIDE
Owner NGK INSULATORS LTD