Vehicle mass emission measurement
First Claim
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1. A method of measuring vehicle exhaust mass emission, comprising:
- 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 the temperatures of the undiluted exhaust gas, the dilute mixture and the ambient air;
measuring flow rate of said dilute mixture; and
resolving said concentration of undiluted exhaust gas components, said temperatures and said flow rate of said dilute mixture to mass emissions of said exhaust gas components.
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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 or temperature of at least one exhaust gas component present in the dilute mixture gas component. Flow rate of the dilute mixture, the concentration and/or temperature 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.
75 Citations
12 Claims
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1. 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 the temperatures of the undiluted exhaust gas, the dilute mixture and the ambient air;
measuring flow rate of said dilute mixture; and
resolving said concentration of undiluted exhaust gas components, said temperatures and said flow rate of said dilute mixture to mass emissions of said exhaust gas components. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
where; Me is mass of the exhaust;
Md is mass of the dilute mixture;
Td is measured temperature of the dilute mixture;
Ta is measured temperature of ambient air; and
Te is measured temperature of the vehicle exhaust gas.
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4. The method of claim 1 wherein said sampling undiluted vehicle exhaust and a dilute mixture of vehicle exhaust and ambient air includes providing an exhaust inlet adapted to collect vehicle exhaust and a dilution air inlet connected with said exhaust inlet to provide a dilute mixture of vehicle exhaust and dilution air.
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5. The method of claim 1 wherein said measuring concentrations of undiluted gas components includes providing a gas analyzer which measures concentration of undiluted exhaust gas components from said exhaust inlet.
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6. The method of claim 1 wherein said measuring the temperatures of the undiluted gas, the dilute mixture and the ambient air includes providing a temperature analyzer which measures the temperatures of the vehicle exhaust gases, the dilution air and said dilute mixture of vehicle exhaust and dilution air.
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7. The method of claim 6 wherein said temperature analyzer comprises temperature probes.
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8. The method of claim 7 wherein said temperature probes are selected from a group consisting of thermistors, RTDs and thermocouple devices.
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9. The method of claim 1 wherein said measuring flow rate includes providing a meter which measures flow rate of said dilute mixture.
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10. The method of claim 1 wherein said resolving includes providing a processor which resolves said concentration of the undiluted exhaust gas components and said temperatures to mass of the exhaust gas components.
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11. The method of claim 10 wherein said processor compensates heat loss of said dilute mixture resulting from the temperature difference between said dilute mixture and the ambient air.
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12. The method of claim 1 wherein said sampling undiluted vehicle exhaust and a dilute mixture of vehicle exhaust and ambient air includes providing a blower for propelling the dilute mixture of exhaust and dilution air.
Specification