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US 9,429,541 B2Granted
Gas sensor element, gas sensor and control system of gas sensor
AssigneeNgk Spark Plug Co., Ltd.
InventorsShin Yoshida, Shigeki Mori, Takeshi Kawai, Hiroshi Inagaki, Seiji Oya, Kentaro Mori
Life of this patent
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Abstract
In order to compensate for variation in output of sensor elements 10, there is provided a compensating resistor 220 that has a resistance value reflected by correction information. The resistor 220 is connected in parallel with a VS cell 245 through paired electrode leads 236 and 237 and paired electrode pads 232 and 233. The paired electrode leads 236 and 237 are placed at a position electrically isolated from solid electrolyte substrates 120 and 140.
Claims8
A gas sensor element for detecting a concentration of oxygen in a gaseous environment and outputting an information signal representative of the concentration of the oxygen, the gas sensor element comprising:
- an elongated plate-shaped detecting element which extends in a lengthwise direction of the gas sensor element, and includes a lower side and an upper side opposing one another, as seen in a thickness direction perpendicular to the lengthwise direction;
- and
- an elongated plate-shaped heater which extends in the lengthwise direction and is laminated on a surface of the lower side of the elongated plate-shaped detecting element,
- the elongated plate-shaped detecting element including:
- an insulating substrate disposed on the upper side,
- an integrated compensating resistor which is provided on an upper surface of the insulating substrate distally to the elongated plate-shaped heater, and
- at least one pump cell and an oxygen generating cell arranged on a side of the insulating substrate opposite the compensating resistor, each of the at least one pump cell and the oxygen generating cell including a solid electrolyte substrate and a pair of electrodes having the solid electrolyte substrate put therebetween,
- wherein the oxygen generating cell generates the oxygen when a constant current is forced to flow through the paired electrodes of the oxygen generating cell,
- wherein the compensating resistor compensates for a variation in an oxygen concentration detecting result of the gas sensor element and has a resistance value determined in advance according to the oxygen concentration detecting characteristic of the gas senor element which is lower than a resistance value of the solid electrolyte substrate under condition of room temperature and is more than ten times as much as a resistance value of the solid electrolyte substrate under a condition of 800°,
- wherein the resistance value of the compensating resistor reflects correction information used for correcting the information signal to achieve a certain value when the gas sensor element is operated, and
- wherein the compensating resistor is electrically and parallelly connected to the paired electrodes of the oxygen generating cell through a current flow line other than a current flow line that has at least one of the solid electrolyte substrates as an essential part of the current flow line.
8 more elements
A gas sensor for detecting a concentration of oxygen in a gaseous environment and outputting an information signal representative of the concentration of the oxygen, the gas sensor comprising:
- a gas sensor element and a housing that holds therein the gas sensor element, wherein the gas sensor element comprises an elongated plate-shaped detecting element which extends in a lengthwise direction of the gas sensor element, and includes a lower side and an upper side opposing one another, as seen in a thickness direction perpendicular to the lengthwise direction, and an elongated plate-shaped heater which extends in the lengthwise direction and is laminated on a surface of the lower side of the elongated plate-shaped detecting element,
- the elongated plate-shaped detecting element including:
- an insulating substrate disposed on the upper side,
- an integrated compensating resistor which is provided on an upper surface of the insulating substrate distally to the elongated plate-shaped heater, and
- at least one pump cell and an oxygen generating cell arranged on a side of the insulating substrate opposite the compensating resistor, each of the at least one pump cell and the oxygen generating cell including a solid electrolyte substrate and a pair of electrodes having the solid electrolyte substrate put therebetween,
- wherein the oxygen generating cell generates the oxygen when a constant current is forced to flow through the paired electrodes of the oxygen generating cell,
- wherein the compensating resistor compensates for a variation in an oxygen concentration detecting result of the gas sensor element, and has a resistance value determined in advance according to the oxygen concentration detecting characteristic of the gas senor element which is lower than a resistance value of the solid electrolyte substrate under condition of room temperature and is more than ten times as much as a resistance value of the solid electrolyte substrate under a condition of 800° C.,
- wherein the resistance value of the compensating resistor reflects correction information used for correcting the information signal to achieve a certain value when the gas sensor element is operated, and
- wherein the compensating resistor is electrically and parallelly connected to the paired electrodes of the oxygen generating cell through a current flow line other than a current flow line that has at least one of the solid electrolyte substrates as an essential part of the current flow line.
6 more elements
Dependencies are inferred from the claim text.