Vehicle/engine sampling system for precise analysis of exhaust components
First Claim
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1. An exhaust gas analysis system, comprising:
- a temperature control system maintaining a gas sample at constant temperature;
a pressure control system maintaining the gas sample at constant pressure;
a gas analyzer analyzing the gas sample;
a vacuum pump transferring the gas sample to the gas analyzer; and
a delay time control system maintaining a constant gas sample delay time through the exhaust gas analysis system.
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Abstract
An apparatus and method of exhaust gas analysis. It includes maintaining a gas sample at a constant temperature and at a constant pressure and maintaining a constant gas sample delay time.
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Citations
52 Claims
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1. An exhaust gas analysis system, comprising:
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a temperature control system maintaining a gas sample at constant temperature;
a pressure control system maintaining the gas sample at constant pressure;
a gas analyzer analyzing the gas sample;
a vacuum pump transferring the gas sample to the gas analyzer; and
a delay time control system maintaining a constant gas sample delay time through the exhaust gas analysis system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An exhaust gas analysis system, comprising:
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a gas analyzer;
a sample line for a gas sample in fluid communication with the gas analyzer;
a temperature sensor;
a heater;
temperature control circuitry operatively connected to the heater to maintain the gas sample at a constant temperature in response to a signal from the temperature sensor;
a pressure sensor;
a pressure control valve in fluid communication with the sample line and an upstream side of the gas analyzer;
pressure control circuitry operatively connected to the pressure control valve to maintain the gas sample at a constant pressure in response to a signal from the pressure sensor;
a vacuum pump in fluid communication with a downstream side of the gas analyzer;
pulse width modulated pump control circuitry operatively connected to the vacuum pump to regulate the power supplied to the vacuum pump; and
constant delay time motor control circuitry operatively connected to the pulse width modulated pump control circuitry to maintain a constant gas sample delay time by regulating the power supplied to the vacuum pump. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. An exhaust gas analysis system, comprising:
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means for maintaining a gas sample at a constant temperature;
means for maintaining the gas sample at a constant pressure;
means for pumping the gas sample through the exhaust gas analysis system;
means for maintaining a constant gas sample delay time through the exhaust gas analysis system; and
means for analyzing the gas sample. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A method for exhaust gas analysis comprising:
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providing a gas sample for analysis;
maintaining the gas sample at constant temperature;
maintaining the gas sample at constant pressure;
providing a gas analyzer;
maintaining a constant gas sample delay time through the exhaust gas analysis system; and
analyzing the gas sample in the gas analyzer to provide a concentration of a gas species. - View Dependent Claims (43, 44, 45, 46, 47)
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48. A method for exhaust gas analysis comprising:
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providing an exhaust gas analysis system comprising;
a temperature control system maintaining a gas sample at constant temperature;
a pressure control system maintaining the gas sample at constant pressure;
a gas analyzer analyzing the gas sample;
a pump transferring the gas sample to the gas analyzer; and
a delay time control system maintaining a constant gas sample delay time through the exhaust gas analysis system;
selecting the constant temperature, the constant pressure, and the constant gas sample delay time;
maintaining the gas sample at the constant temperature, maintaining the gas sample at the constant pressure, and maintaining the constant gas sample delay time; and
frequently periodically analyzing the gas sample in the gas analyzer to obtain a concentration for one or more gas species. - View Dependent Claims (49, 50, 51, 52)
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Specification