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US 12,631,610 B2Granted
Gas sensor
AssigneeTDK Corporation
InventorsYoshio Kaita, Hiroshi Kobayashi, Yasuhiro Inui
Life of this patent
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Abstract
Disclosed herein is a gas sensor that includes a gas sensor part including first and second thermistors connected in series, a temperature sensor part configured to generate a temperature detection signal, a variable resistor connected in parallel to the first thermistor, and a control circuit configured to change a resistance value of the variable resistor based on the temperature detection signal.
Claims11
A gas sensor comprising:
- a gas sensor part including first and second thermistors connected in series;
- a temperature sensor part configured to generate a temperature detection signal;
- a variable resistor connected in parallel to the first thermistor;
- and
- a control circuit configured to change a resistance value of the variable resistor based on the temperature detection signal,
- wherein the control circuit is configured to reduce the resistance value of the variable resistor as a temperature value indicated by the temperature detection signal increases.
3 more elements
A gas sensor comprising:
- a gas sensor part including first and second thermistors connected in series;
- a temperature sensor part configured to generate a temperature detection signal;
- a variable resistor connected in parallel to the first thermistor;
- and
- a control circuit configured to change stepwise a resistance value of the variable resistor based on the temperature detection signal,
- wherein the control circuit is configured to change the resistance value of the variable resistor from a first resistance value to a second resistance value when the temperature detection signal exceeds a first level, and
- wherein the control circuit is configured to change the resistance value of the variable resistor from the second resistance value to the first resistance value when the temperature detection signal falls below a second level different from the first level.
4 more elements
A gas sensor comprising:
- a gas sensor part including first and second thermistors connected in series;
- a temperature sensor part configured to generate a temperature detection signal;
- a variable resistor connected in parallel to the first thermistor;
- and
- a control circuit configured to change stepwise a resistance value of the variable resistor based on the temperature detection signal,
- wherein the control circuit is configured to:
- generate an output signal indicating a concentration of a gas to be measured based on a gas detection signal appearing at a connection point between the first and second thermistors;
- compare a gas detection value based on the gas detection signal with a reference value corresponding to a level of the gas detection signal normally obtained when a concentration of the gas to be measured indicates a concentration value in normal time to generate the output signal;
- and
- change stepwise the reference value with a stepwise change in the resistance value of the variable resistor.
7 more elements
A gas sensor comprising:
- a gas sensor part including first and second thermistors connected in series;
- a temperature sensor part configured to generate a temperature detection signal;
- a variable resistor connected in parallel to the first thermistor;
- and
- a control circuit configured to change a resistance value of the variable resistor based on the temperature detection signal,
- wherein the control circuit is configured to reduce stepwise the resistance value of the variable resistor as a temperature value indicated by the temperature detection signal increases.
3 more elements
Dependencies are inferred from the claim text.