Nitric oxide enhanced response circuit for gas analyzer
First Claim
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1. Apparatus for analyzing exhaust emissions from an internal combustion engine comprising:
- a transducer assembly including an electrochemical sensor responsive to an oxide of nitrogen in the emissions for generating an electrical output signal at an output,a processing circuit having an input and responsive to the output signal, anda response enhancing circuit adapted to be coupled in series between said output and said input for reducing the duration of said output signal, whereby the overall response time of the apparatus is reduced.
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Abstract
An exhaust emissions analyzer for an automotive internal combustion engine has sensors for detecting constituents of the exhaust emissions, including a nitric oxide cell which receives the emissions and outputs an electrical signal indicative of nitric oxide in the emissions. An R-C circuit is interposed between the output of the nitric oxide cell and processing circuitry for enhancing the response time of the nitric oxide cell, reducing the rise and fall times of the cell output of signal. A temperature-responsive switching circuit disconnects the R-C enhancement circuit above a predetermined ambient temperature.
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Citations
17 Claims
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1. Apparatus for analyzing exhaust emissions from an internal combustion engine comprising:
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a transducer assembly including an electrochemical sensor responsive to an oxide of nitrogen in the emissions for generating an electrical output signal at an output, a processing circuit having an input and responsive to the output signal, and a response enhancing circuit adapted to be coupled in series between said output and said input for reducing the duration of said output signal, whereby the overall response time of the apparatus is reduced. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Fluid constituent detection apparatus having an output terminal and comprising:
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a transducer responsive to a predetermined constituent of a fluid for generating an electrical output signal at a transducer output, a response enhancing circuit adapted to be coupled to said transducer output for reducing the duration of the output signal, and a switch mechanism having a first condition for electrically connecting said response enhancing circuit in series between said transducer output and said output terminal and a second condition for electrically disconnecting said response enhancing circuit from said output terminal and connecting said transducer output directly to said output terminal. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A method for sensing a constituent gas in the exhaust emissions of an internal combustion engine comprising:
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exposing the emissions to a constituent transducer for producing an electrical output signal indicative of the presence of the constituent gas, sensing the ambient temperature, and reducing the duration of the output signal only when the ambient temperature is below a predetermined temperature. - View Dependent Claims (16, 17)
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Specification