A gas sensor includes a sensor element and a pump cell controller. The pump cell controller performs a normal time control process after a heater control process is started, the normal time control process including a main pump control process, an auxiliary pump control process of controlling an auxiliary pump cell so that a voltage for auxiliary pump reaches a target value, and a normal time measurement pump control process of pumping out oxygen in a measurement chamber by controlling the measurement pump cell so that a measurement voltage reaches a normal time target value. In an early stage of the normal time control process, the pump cell controller performs a correction process of correcting the target value of the voltage for auxiliary pump to a value higher than a target value in a period after the early stage.

A gas sensor includes a sensor element and a pump cell controller. During a normal operation time of the sensor element, the pump cell controller executes a normal time measurement pump control process of pumping out the oxygen in a measurement chamber by controlling a measurement pump cell so that voltage for measurement reaches a normal time target value. At the start-up time of the sensor element, the pump cell controller executes a start-up time measurement pump control process of pumping out the oxygen in the measurement chamber by controlling the measurement pump cell so that the voltage for measurement reaches a start-up time target value higher than the normal time target value. When determining that the oxygen concentration in the measurement chamber is stabilized, the pump cell controller makes switching from the start-up time measurement pump control process to the normal time measurement pump control process.

A maintenance method for a zirconia-type oxygen analyzer that uses a zirconia sensor to measure oxygen concentration of a gas to be measured includes storing in a memory, by the zirconia-type oxygen analyzer, an internal resistance of the zirconia sensor and/or a calibration coefficient for correcting, based on a measured value of a physical quantity measured by the zirconia sensor for a standard gas having a known oxygen concentration, a formula for converting a measured value of a physical quantity measured by the zirconia sensor into the oxygen concentration of the gas to be measured, determining, by an information processing apparatus, the timing for performing maintenance on the zirconia sensor based on a change over time in the internal resistance and/or calibration coefficient stored in the memory, and presenting, by the information processing apparatus, the timing for performing maintenance on the zirconia sensor.

A gas concentration detection device has a first element part, a first detection part, a second element part, a second detection part and a sensitivity correction part. The sensitivity correction part is configured to correct a second gas component concentration detected by the second detection part based on a time difference between a first response time of the first detection part and a second response time of the second detection part when the first detection part and the second detection part have a function of detecting a common gas component contained in a target gas to be detected, and a variation in concentration of the common gas component exceeds a reference variation amount.

The invention provides a gas detection system and a method with eliminating influence of ambient temperature and humidity change, the gas detection system comprises a bare sensor, a reference sensor and a calculation module; the bare sensor is used to detect a target gas in an ambient gas to obtain a first feedback signal; the reference sensor is used to selectively isolate the target gas in the ambient gas to produce a zero gas and to detect the zero gas to obtain a second feedback signal, the calculation module is used to calculate a difference between the first feedback signal and the second feedback signal to obtain a third feedback signal, and to obtain a target gas concentration by calculating the third feedback signal according to a calibration formula. The invention improves the measurement accuracy to the target gas concentration, which are efficient and reliable and have good technical effects.

A gas sensor includes a measurement chamber, a reference gas chamber, a first cell that includes a first electrode in the measurement chamber and a second electrode in the reference gas chamber, and a second cell that includes a third electrode in the measurement chamber and a fourth electrode in the reference gas chamber. The gas sensor detects a first current that flows through the first cell, detects a second current that flows through the second cell, calculates a concentration of a specific gas component based on a detected value of the second current, determines whether a change has occurred in an oxygen concentration in the reference gas chamber based on a detected value of the first current, and corrects the detected value of the second current when the gas sensor determines that a change has occurred in the oxygen concentration in the reference gas chamber.

A method for operating a sensor for detecting at least a portion of a measured-gas component having bound oxygen in a measured gas in an exhaust gas of an internal combustion engine. The sensor encompasses a sensor element including: a first pump cell; a reference cell; and a second pump cell. An electronic control device is connected to the sensor element; the first pump cell is connected using an electrically conductive connection to a first separate terminal of the device; the second pump cell is connected by an electrically conductive connection to a second separate terminal of the device; a measuring resistor is provided in the connection that connects the second pump cell to the second separate terminal; a current excitation and/or voltage excitation of the second pump cell is carried out using the control device to generate a measured signal at the measuring resistor.

The present disclosure relates to a device for measuring the amount of oxygen present in a gas to be analyze. The device includes at least one member for measuring the amount of oxygen, a first inlet in communication with the measuring member for the supply of gas to be analyzed, and an outlet for the discharge of said analyzed gas. The device also includes a second inlet intended to communicate with the measuring member, allowing said device to be supplied selectively with a calibration gas having a known amount of oxygen, such that the measurement of the amount of oxygen present in the calibration gas makes it possible to determine a potential drift of the measurement of said measuring member relative to the actual known amount of oxygen present in the calibration gas.

A microcomputer includes a voltage application unit that selectively applies a normal voltage and a removal voltage higher than the normal voltage to a first cell of the exhaust gas sensor. The first cell is configured to remove, based on the removal voltage, oxygen in an exhaust gas from an internal combustion engine. The microcomputer includes an element temperature measurement unit that measures an element temperature parameter indicative of a temperature of the first cell. The microcomputer includes a termination determination unit that determines, based on the element temperature parameter, a termination time of terminating the application of the removal voltage to the first cell by the voltage application unit.

A gas sensor includes a sensor element including an element body, a first electrode, a second electrode, and a heater; a voltage acquisition section that acquires a voltage between the first electrode and the second electrode; a heater power supply; an external common lead that serves as both at least part of an electric circuit used to acquire the voltage by providing electrical continuity between the first electrode and the voltage acquisition section and at least part of an electric circuit used to supply an electric power from the heater power supply to the heater and that is disposed outside the sensor element; and a correction section that derives a value of a voltage drop in the external common lead in accordance with a heater current and that corrects the voltage acquired by the voltage acquisition section in accordance with the derived value of the voltage drop.