Signal Processing for Error Reduction in a Hot-Wire Air Flow Sensor

Paper #:
  • 980265

Published:
  • 1998-02-23
Citation:
Kowatari, T., Arai, N., and Kobayashi, C., "Signal Processing for Error Reduction in a Hot-Wire Air Flow Sensor," SAE Technical Paper 980265, 1998, https://doi.org/10.4271/980265.
Pages:
8
Abstract:
The hot-wire(H/W) element of an air flow sensor has a tendency to indicate lower than actual flow rate when subjected to large-amplitude oscillatory flow. First, the causes for this measurement error is investigated and a new dynamic model for H/W is proposed. The dynamic model is a combination of the static non-linearity output characteristic of the H/W element and the dynamic response of the H/W element. Second, a signal processing method is developed to correct the measurement error of the H/W by inversing the proposed H/W dynamic model. The result shows that by using this signal processing method, the measurement error of the H/W is reduced.
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