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AssigneeHoriba Instuments, Inc.
InventorWilliam M. Silvis
Estimating the term…
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.
A method for controlling flow in an exhaust emission sampling system including a flow controller for controlling the flow of a diluted sample of exhaust emissions from an engine's combustion process, the diluted sample having a predetermined dilution ratio, said method comprising controlling the flow controller in order to compensate for effects of changing water vapor content in the diluted sample, the method comprising the steps of:
In an exhaust emission sampling system including a flow controller for controlling the flow of a diluted sample of exhaust emissions from an engine's combustion process, the diluted sample having a predetermined dilution ratio, the improvement comprising:
Dependencies are inferred from the claim text.