Gas sensor apparatus and concentration measurement method performed through use of gas sensor
AssigneeNgk Spark Plug Co., Ltd.
InventorsMasao Tsuzuki, Toyohiro Tsukahara
Life of this patent
Estimating the term…
Abstract
A gas sensor apparatus including a gas sensor (10) which outputs an output value corresponding to the concentration of a specific gas component, and a computation section (30) which calculates a specific component concentration based on the output value output and a pressure value representing the pressure of the gas. The computation section (30) includes pressure change rate calculation means (31), pressure change rate judgment means (32), correction amount calculation means (33), and output correction means (34). Also disclosed is a concentration measurement method using the gas sensor.
Claims5
A gas sensor apparatus comprising:
- a gas sensor which outputs an output value corresponding to the concentration of a specific gas component contained in a gas flowing through a flow passage provided in an internal combustion engine;
- and
- a computation section which calculates a specific component concentration based on the output value output from the gas sensor and a pressure value representing the pressure of the gas,
- the computation section comprising:
- means for calculating a pressure change rate from a change in pressure per a predetermined time period;
- means for judging whether or not the pressure change rate exceeds a predetermined rate;
- means for calculating a provisional specific component concentration based on the output value output from the gas sensor and the pressure value representing the pressure of the gas;
- means for calculating a correction amount for the provisional specific component concentration value based on the calculated pressure change rate when the pressure change rate is judged to have exceeded the predetermined rate;
- and
- means for correcting the provisional specific component concentration from the gas sensor using the correction amount calculated by the correction amount calculation means.
A concentration measurement method performed using a gas sensor which outputs an output value corresponding to the concentration of a specific gas component contained in a gas flowing through a flow passage provided in an internal combustion engine, the method being adapted to calculate a specific component concentration based on the output value output from the gas sensor and a pressure value representing the pressure of the gas,
- the method comprising:
- calculating a pressure change rate from a change amount of the pressure value per a predetermined time period;
- calculating a provisional specific component concentration based on the output value output from the gas sensor and the pressure value representing the pressure of the gas;
- judging whether or not the pressure change rate exceeds a predetermined rate;
- calculating a correction amount for the provisional specific component concentration based on the calculated pressure change rate when the pressure change rate is judged to have exceeded the predetermined rate;
- and
- correcting the provisional specific component concentration from the gas sensor using the calculated correction amount.
Dependencies are inferred from the claim text.