Exhaust sampling system and method for synchronizing time alignment and dilation
First Claim
1. A system for sampling exhaust produced by an engine comprising:
- a first instrument measuring a first flow rate of the exhaust leaving the engine and generating a first signal including a first flow rate component indicating said first flow rate and a first instrument time stamp component associated with sampling at a first time;
a second instrument measuring a pollutant concentration and generating a second signal including a pollutant concentration component indicating said pollutant concentration and a second instrument time stamp component associated with sampling at said first time and generating a tertiary signal including a component indicating a parameter that has been influenced by said first flow rate and including said second instrument time stamp component; and
a synchronization module receiving and processing said first signal, said second signal, and said tertiary signal to determine a time relationship between said first signal and said second signal by comparing said first flow rate component and said first instrument time stamp component of said first signal to said influenced parameter component and said second instrument time stamp component of said tertiary signal.
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Accused Products
Abstract
A system and method is provided for synchronizing a first and second signal of an exhaust sampling system. The first signal is generated by a first instrument and includes an exhaust flow rate component and a first instrument time stamp component. The second signal is generated by a second instrument and includes a pollutant concentration component and a second instrument time stamp component. The second instrument also generates a tertiary signal that has been influenced by the first signal and includes a second instrument time stamp component. A synchronization module determines a time relationship for synchronizing the first signal and the second signal by comparing the first flow rate component and the first instrument time stamp component of the first signal to the tertiary signal and the second instrument time stamp component of the tertiary signal. The synchronization provides accurate calculation of a pollutant mass flow rate.
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Citations
25 Claims
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1. A system for sampling exhaust produced by an engine comprising:
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a first instrument measuring a first flow rate of the exhaust leaving the engine and generating a first signal including a first flow rate component indicating said first flow rate and a first instrument time stamp component associated with sampling at a first time; a second instrument measuring a pollutant concentration and generating a second signal including a pollutant concentration component indicating said pollutant concentration and a second instrument time stamp component associated with sampling at said first time and generating a tertiary signal including a component indicating a parameter that has been influenced by said first flow rate and including said second instrument time stamp component; and a synchronization module receiving and processing said first signal, said second signal, and said tertiary signal to determine a time relationship between said first signal and said second signal by comparing said first flow rate component and said first instrument time stamp component of said first signal to said influenced parameter component and said second instrument time stamp component of said tertiary signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 20, 21)
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10. A system for sampling exhaust comprising:
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a first instrument measuring a first flow rate of the exhaust passing by said first instrument and generating a first signal including a first flow rate component indicating said first flow rate and a first instrument time stamp component associated with sampling at a first time; a second instrument measuring a pollutant concentration and generating a second signal including a pollutant concentration component indicating said pollutant concentration and a second instrument time stamp component associated with sampling at said first time and generating a tertiary signal including a component indicating a parameter that has been influenced by said first flow rate and including said second instrument time stamp component; and a synchronization module receiving and processing said first signal, said second signal, and said tertiary signal to determine a time relationship between said first signal and said second signal by comparing said first flow rate component and said first instrument time stamp component of said first signal to said influenced parameter component and said second instrument time stamp component of said tertiary signal. - View Dependent Claims (22, 23)
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11. A method of synchronizing signals of an exhaust sampling system comprising:
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detecting a first signal from a first instrument, the first signal including a first flow rate component indicating a first flow rate of exhaust from an engine and a first instrument time stamp component associated with sampling at a first time; detecting a second signal from a second instrument, the second signal including a pollutant concentration component indicating the pollutant concentration of exhaust within the second instrument and a second instrument time stamp component associated with sampling at the first time; detecting a tertiary signal from the second instrument, the tertiary signal including a component indicating a parameter having been influenced by said first flow rate and including the second instrument time stamp component; and determining a time relationship between the first signal and the second signal by comparing the exhaust flow rate component and the first instrument time stamp component of the first signal to the influenced parameter component and the second instrument time stamp component of the tertiary signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 24, 25)
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Specification