Gas sensor, control device and control method for gas sensor
AssigneeNGK Insulators, Ltd.
InventorKousuke UJIHARA
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Abstract
A gas sensor includes a sensor element having an element body and a heating portion provided inside the element body, and a control device configured to control a voltage applied to the heating portion. When heating the element body, the control device performs warm-up control processing for controlling the voltage applied to the heating portion such that, when the degree of degradation of the heating portion is equal to or greater than a predetermined degree, a rate of change per unit time of a resistance ratio becomes smaller than when the degree of degradation is less than the predetermined degree.
Claims9
A gas sensor comprising:
- a sensor element including an element body and a resistive heating element provided inside the element body;
- and
- a control device configured to control a voltage applied to the resistive heating element,
- the gas sensor being configured to detect a concentration of a specific gas in a measurement gas,
- wherein the control device is configured to perform heating control processing for controlling the voltage applied to the resistive heating element such that, when a degree of degradation of the resistive heating element is equal to or greater than a predetermined degree, a rate of change per unit time of a resistance-related value related to a resistance value of the resistive heating element is smaller than that when the degree of degradation is less than the predetermined degree, during heating of the element body.
A control device for use in a gas sensor that comprises a sensor element having an element body and a resistive heating element provided inside the element body, and is configured to detect a concentration of a specific gas in a measurement gas,
- wherein the control device is configured to perform heating control processing for controlling a voltage applied to the resistive heating element such that, when a degree of degradation of the resistive heating element is equal to or greater than a predetermined degree, a rate of change per unit time of a resistance-related value related to a resistance value of the resistive heating element is smaller than that when the degree of degradation is less than the predetermined degree, during heating of the element body.
A control method for a gas sensor comprising a sensor element having an element body and a resistive heating element provided inside the element body, the gas sensor being configured to detect a concentration of a specific gas in a measurement gas,
- the control method comprising performing heating control processing for controlling a voltage applied to the resistive heating element such that, when a degree of degradation of the resistive heating element is equal to or greater than a predetermined degree, a rate of change per unit time of a resistance-related value related to a resistance value of the resistive heating element is smaller than that when the degree of degradation is less than the predetermined degree, during heating of the element body.
Dependencies are inferred from the claim text.