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Thermal air flowmeter

  • US 6,904,379 B1
  • Filed: 09/04/2000
  • Issued: 06/07/2005
  • Est. Priority Date: 09/04/2000
  • Status: Expired due to Term
First Claim
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1. A thermal air flowmeter, comprising a temperature-dependent heating resistance element arrangeable in an air flow path, a gauge circuit which includes said heating resistance element configured to provide an output having a nonlinear characteristic from which air flow rate is measurable, and a calculation circuit configured to calculate the difference of a nonlinear target output characteristic and a real output characteristic of said gauge circuit by a polynomial expression higher than a quadratic expression, and to correct the real output-characteristic by the calculated difference.

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