Heat type air flow meter
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United States of America Patent
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Aug 5, 1997
Grant Date -
N/A
app pub date -
Jun 7, 1995
filing date -
Jun 10, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A heat type air flow meter with improved resistance to radio wave interference by restraining a high frequency noise from a resistor and the supporting materials thereof provided in air passage. At least one high frequency band cut-off filter having a capacitor and a inductor is provided between, on one hand, a heating resistor and a heat sensitive resistor and, on the other hand, a temperature control circuit, and an intermediate connecting point of one end of the capacitor connected with one end of the inductor is also connected to both resistors. Thereby, as the resistivity to the radio wave interference is effectively improved cost reduction and compactness of the flow meter can be achieved.
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