Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1997-11-14
1999-09-28
Lopez, F. Daniel
Power plants
Internal combustion engine with treatment or handling of...
Methods
60277, 60276, 60285, 701102, 701109, F01N 300
Patent
active
059569450
ABSTRACT:
A method and apparatus converts time-resolved sensor signals into transfer functions and/or cumulative transfer function signals which can be attained by computation means such as by using Fast Fourier Transforms. A signal, as a means to assess catalyst performance such as a signal based on sensing oxygen concentration or air to fuel ratio or hydrocarbon concentration in motor vehicle exhaust in accordance with the present invention is in the time domain and has multiple components at different frequencies. The use of Fast Fourier Transforms isolates the various spectral densities which arise from different frequency components of the complex time domain signal. Cross spectral density function and power spectral density function are used to determine the transfer function. The analysis has been found to be substantially independent of operating conditions. The transfer function and cumulative transfer function have been found to be a precise indication of the catalyst performance. The catalyst performance can be signaled to the vehicle operator for on board diagnostics (OBD) of the catalyst.
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Chewter Alan
Heck Ronald M.
Kumar Sanath V.
Naber Jeffrey D.
Price David R.
Engelhard Corp.
Hopman Nicholas C.
Lopez F. Daniel
Motorola Inc.
Nawalanic Frank J.
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