A Measuring Device for Exhaust Gas Components of Internal Combustion Engines Based on Absorption Peak Locking Mode

Abstract

The invention aims at providing an absorption peak locking mode-based device for measuring components of internal combustion engine exhaust gas. The device comprises a first laser controller, a second laser controller, a frequency sweeping laser, a frequency locking laser, a first photoelectric detector, a second photoelectric detector, a reference cell and a detection cell, wherein the gas exhausted by an internal combustion engine are divided into two paths; the first path of the gas enters the reference cell, and the second path of the gas enters the detection cell; the first laser controller is connected with the frequency sweeping laser; a laser signal output by the frequency sweeping laser penetrates through the reference cell; a laser spectrum in the reference cell, detected by the first photoelectric detector, is fed back to the second laser controller by virtue of a feedback module; the second laser controller is connected with the frequency locking laser; laser emitted by the frequency locking laser enters the detection cell; and the laser spectrum in the detection cell, detected by the second photoelectric detector, is transmitted to a computer. According to the device disclosed by the invention, the detection errors caused by transient environment parameters and complicated gas components due to the exhaust of the internal combustion engine can be well avoided.

Description

technical field [0001] The invention relates to a device for measuring the composition of exhaust gas of an internal combustion engine. Background technique [0002] Energy saving and emission reduction is the goal that the internal combustion engine industry has been pursuing. Especially recently, due to the continuous deterioration of environmental factors, the international regulations on the emission of internal combustion engines have become increasingly stringent. Therefore, the future internal combustion engine exclusion detection technology will develop along the trend of real-time online detection, and the traditional internal combustion engine bench test detection method will gradually be replaced. Most of the existing internal combustion engine detection methods belong to the sampling method, and most of the methods have a long reaction time, so it is difficult to achieve real-time online detection. Compared with the traditional method, the optical test method b...

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Problems solved by technology

[0003] The purpose of the present invention is to provide an internal combustion engine exhaust gas composition measurement device based on the absorption peak locking mode that solves the problem of poor detection dynamic response caused by the complex characteristics of the internal combustion engine exhaust gas, resulting in low detection accuracy.

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