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Methods and systems for controlling flow of a diluted sample and determining pollutants based on water content in engine exhaust emissions
Methods and systems for controlling flow of a diluted sample and determining pollutants based on water content in engine exhaust emissions
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机译:用于控制稀释样品流量并根据发动机废气排放中的水分确定污染物的方法和系统
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摘要
In a first embodiment of the present invention, a control method and system are provided in an exhaust emission sampling system for controlling a flow controller in order to compensate for the effects of changing water vapor content in a diluted sample having a predetermined dilution ratio. A water measuring device such as a relative humidity sensor generates a water vapor signal based on the amount of water vapor in the diluted sample. The water vapor signal is then processed within a control unit to obtain a value for the amount of water in the diluted sample. A control signal is generated by the control unit based on the amount of water vapor, flow rate of the exhaust emissions, and also, on the type of fuel used in the combustion process to control the flow controller which is, preferably, a mass flow controller.
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