Fuel gas sensor calibration method based on CAN bus

Abstract

The invention relates to a fuel gas sensor calibration method based on CAN bus, and belongs to the technical field of automobile electronic engineering. The method selects a gas of the standard fuel gas concentration (15% of fuel gas explosion limit in air), achieves the regulation of calibrated fuel gas concentration by a vacuum pump, a flow meter, a fuel gas detector, a fan and a controller, so as to achieve the environment of the calibrated fuel gas concentration; calibration is achieved by connecting a probe, a relay group and a control panel one by one; the delivery of calibration name and the feedback of calibration result are achieved via a CAN bus in combination with an upper computer, a hardware interface (CAN card) and a controller; record files of the calibration process and the calibration result are generated by the upper computer; the record files are used for users to look up and analyze. By employing the method, the efficiency of fuel gas sensor calibration can be greatly increased, and the cost of calibration can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of automobile electronic engineering and relates to a calibration method of a gas sensor based on a CAN bus. Background technique [0002] With the continuous improvement of people's awareness of environmental protection and the continuous development of automobile industrialization, people pay more and more attention to clean fuel and low cost. Because of its environmental protection, high efficiency, environmental protection, energy saving and other characteristics, gas has gradually been recognized and promoted by people. Therefore, the trend of fuel from diesel to gasoline to natural gas continues to develop. [0003] With the development of natural gas vehicles, the number of vehicles powered by natural gas has increased rapidly, which has caused related issues such as storage and safety of gas. Accidents such as explosions, poisoning and fires caused by gas leakage also occur from time to time, which...

AI Technical Summary

Problems solved by technology

According to the relevant provisions of the national measurement and testing regulations JJG 693-2004, it is necessary to effectively limit the gas detection concentration range, and because of the uniqueness of the gas sensor itself (each sensor has a certain difference in the detection output signal of the same gas concentration), so the actual In the application, each sensor and alarm in the gas system needs to be calibrated accordingly, which leads to problems such as difficult calibration, high calibration cost, and low calibration efficiency.

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