Characteristic self-learning device of universal exhaust gas oxygen sensor and using method of characteristic self-learning device

Abstract

The invention discloses a characteristic self-learning device of a universal exhaust gas oxygen sensor. The characteristic self-learning device comprises an excess air coefficient calibration value storing module, a correcting condition judging module, a self-learning module and a self-learning starting condition judging module, wherein the input end of the self-learning module is electrically connected with the output end of the excess air coefficient calibration value storing module, the output end of the correcting condition judging module, the output end of the self-learning starting condition judging module and the output end of the universal exhaust gas oxygen sensor. When the characteristic self-learning device is used, the self-learning module is controlled by the self-learning starting condition judging module to be activated, a specific value factor of an excess air coefficient detection value to an excess air coefficient calibration value under the self-learning starting condition is obtained through calculation of the self-learning module first, and when the correcting condition judging module detects that the vehicle working condition meets the correcting condition, the self-learning module takes an excess air coefficient corresponding to a value obtained after an excess air coefficient signal value measured by the universal exhaust gas oxygen sensor under the working condition is divided by the factor as a corrected excess air coefficient. According to the device, in-time and effective correction on the excess air coefficient is achieved.

Description

technical field [0001] The invention belongs to the field of automobile engine performance control, and in particular relates to a characteristic self-learning device of a wide-area oxygen sensor and a using method thereof, which are suitable for realizing timely correction of an excess air coefficient. Background technique [0002] The wide-area oxygen sensor is usually installed on the exhaust pipe of the engine. It mainly feeds back the measured excess air coefficient by measuring the oxygen concentration. After receiving it, the ECU compares the difference between the measured value and the target value to compensate (increase or decrease) the fuel injection quantity. , which is the commonly used fuel closed-loop control method at present. This method relies on the measurement characteristics of the oxygen sensor itself - the functional relationship between the feedback voltage and the excess air coefficient. The excess air coefficient under the current working condition ...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the existing problem in the prior art that the authenticity of the measurement of the excess air ratio cannot be guaranteed, and to provide a

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