Vehicle mass emission measurement
First Claim
1. A vehicle exhaust mass emission analyzer, comprising:
- an exhaust inlet adapted to collect vehicle exhaust;
a dilution air inlet connected with said exhaust inlet to provide a dilute mixture of vehicle exhaust and dilution air;
a first analyzer which measures concentration of undiluted exhaust gas components from said exhaust inlet;
a second analyzer which measures concentration of at least one dilute mixture gas component, said at least one dilute mixture gas component being a particular exhaust gas component measured by said first analyzer which is also present in ambient air in an accurately measurable quantity;
a meter which measures flow rate of said dilute mixture; and
a processor which computes mass of the exhaust gas components from said concentration of the undiluted exhaust gas components, said concentration of at least one dilute mixture gas component and said flow rate of said dilute mixture.
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Abstract
A method and apparatus for measuring vehicle exhaust emission includes sampling vehicle exhaust and a dilute mixture of vehicle exhaust and ambient air. A first analyzer measures concentrations of gas components of undiluted vehicle exhaust. A second analyzer measures concentration of at least one exhaust gas component present in the dilute mixture gas component. The at least one dilute mixture gas component is a particular exhaust gas component measured by the first analyzer which is also present in ambient air in substantial quantity. Flow rate of the dilute mixture, the concentration of the at least one dilute mixture gas component and undiluted gas concentration are analyzed by a microprocessor to produce mass emissions of the vehicle exhaust gas components.
48 Citations
33 Claims
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1. A vehicle exhaust mass emission analyzer, comprising:
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an exhaust inlet adapted to collect vehicle exhaust; a dilution air inlet connected with said exhaust inlet to provide a dilute mixture of vehicle exhaust and dilution air; a first analyzer which measures concentration of undiluted exhaust gas components from said exhaust inlet; a second analyzer which measures concentration of at least one dilute mixture gas component, said at least one dilute mixture gas component being a particular exhaust gas component measured by said first analyzer which is also present in ambient air in an accurately measurable quantity; a meter which measures flow rate of said dilute mixture; and a processor which computes mass of the exhaust gas components from said concentration of the undiluted exhaust gas components, said concentration of at least one dilute mixture gas component and said flow rate of said dilute mixture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A vehicle exhaust mass emission analyzer, comprising:
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an exhaust inlet adapted to collect vehicle exhaust; a dilution air inlet connected with said exhaust inlet to provide a dilute mixture of exhaust and dilution air; a first analyzer which measures concentration of undiluted exhaust gas components from said exhaust inlet; a second analyzer which measures concentration of at least one dilute mixture gas component, said at least one dilute mixture gas component being a particular said exhaust gas component also measured by said first analyzer; a meter which measures flow rate of said dilute mixture; and a processor which calculates mass of the exhaust gas components from the concentration of undiluted exhaust gas components, the concentration of at least one dilute mixture gas component and the flow rate of said dilute mixture, wherein said processor compensates mass of exhaust gas components for chemical reaction of said at least one dilute mixture gas component and said exhaust gas components. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of measuring vehicle exhaust mass emission, comprising:
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sampling undiluted vehicle exhaust and a dilute mixture of vehicle exhaust and ambient air; measuring concentrations of undiluted gas components of said vehicle exhaust; measuring concentration of at least one dilute mixture gas component, the at least one dilute mixture gas component being a particular exhaust gas component which is accurately measurable in ambient air; measuring flow rate of said dilute mixture; and calculating mass emissions of the exhaust gas components from said concentration of undiluted exhaust gas components, said concentration of said particular component and said flow rate of said dilute mixture. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification