ZrO2 limiting current oxygen sensor height compensating method

Abstract

The invention discloses a ZrO2 limiting current oxygen sensor height compensating method; a heating circuit heats a ZrO2 limiting current oxygen sensor such that the sensor meets required working conditions; a height and pressure collection unit converts a collected height signal into an electrical signal and transits the electrical signal to a resolving unit; a sensor output amplifying circuit performs I / V amplification on current output by the ZrO2 limiting current oxygen sensor and transmits the current to the resolving unit; the resolving unit digitalizes parameters and finishes height compensation for oxygen concentration output of the oxygen sensor according to a compensating algorithm; by adding a height sensor and compensating output of the oxygen sensor through the height compensating method, the oxygen sensor has improved environmental adaptability, measuring precision of the sensor in different height environments is guaranteed, and compensating is real-time.

Description

technical field [0001] The invention relates to a limiting current oxygen sensor, in particular to a ZrO 2 A limiting current oxygen sensor altitude compensation method. Background technique [0002] Due to the high accuracy of oxygen measurement and good adaptability to low temperature environment, the limit current oxygen sensor has been used in low pressure environment in high altitude areas. Some new problems have been found in the use of low-pressure environment, such as the measured oxygen concentration obtained according to the classical theory established under normal pressure is smaller than the actual value, etc., resulting in errors in measurement accuracy. Currently, the solid electrolyte zirconia and P t The oxygen measurement relationship of the limiting current oxygen sensor composed of electrodes mainly depends on the diffusion mechanism of oxygen. According to the relative size of the diffusion pore diameter d of the sensor and the mean free path λ of oxy...

AI Technical Summary

Problems solved by technology

Some new problems have been found in the use of low-pressure environments, such as the measured values ​​of oxygen concentration obtained according to the classical theory established under normal pressure are smaller than the actual value, etc., resulting in errors in measurement accuracy

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