A method for measuring with a calibration system of a particle sensor

Abstract

The invention discloses a particle sensor calibration system and a measuring method. A fuel is introduced into an inverse diffusion flame combustor, an upper combustor mouth is communicated with an exhaust pipe, a gas mixture is ignited, and stable soot is produced by combustion of the gas mixture; a compressor is started, and a stable quantity of air is introduced; air input is adjusted through a pressure-regulating valve, and the air is heated by a heater and then enters the exhaust pipe to dilute the soot produced by combustion; air input flow adjusted by the pressure-regulating valve is read by a flowmeter; a temperature sensor outputs the temperature of diluted particles; the soot enters a particle sensor, a current signal is output and then amplified and converted by a circuit board, then a voltage signal is output, an A / D converter is used to acquire a signal value, and a voltage value is read by a computer; a transient smokemeter is started in the moment when the soot enters the particle sensor, and transient soot concentration is measured and output; and the voltage values output by the particle sensor under different soot concentrations are recorded, a calibration curve representing the changes of the voltage values under different soot concentrations is drafted, and accurate particle concentration is obtained.

Description

technical field [0001] The invention relates to the technical field of vehicle exhaust emission control, in particular to a calibration system and measurement method for a particle sensor. Background technique [0002] It is well known that diesel engine emissions contain a large amount of particulate matter, especially PM 2.5 Accounting for 80% of particulate matter emissions, it will cause great harm to the environment and human health. Therefore, many researchers at home and abroad have carried out in-depth exploration and research on particulate matter emitted by diesel engines. In the United States, the on-board diagnostic regulations have clearly applied for the use of particulate matter The sensor is mainly used to monitor the working condition of the particulate filter (DPF). [0003] At present, California of the United States has formulated the on-board diagnostic system (OBD) emission regulations that will be implemented in 2013, and the particulate matter limit ...

AI Technical Summary

Problems solved by technology

However, because the current research on particle sensing technology is not yet mature, many scholars at home and abroad have carried out in-depth research on particle sensors, and proposed various types of particle sensors according to different particle concentration detection principles: resistive, capacitive, electric Chemical formula, catalytic combustion type, and leakage current type all use the electrical signal output by the sensor to determine the carbon content. Now there is a lack of accurate and effective particle sensor calibration devices and measurement methods, and no reports have been seen yet.

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