Patent ID: 9091578
Filing Date: 2015-07-28
Classification: G01F,G05D

Abstract:
1. A thermal flow rate sensor comprising: a main flow path through which a fluid flows; and a sensor flow path that branches off from the main flow path so as to cause the fluid to flow in a split flow and that is provided with a flow rate detecting mechanism configured to detect a flow rate of the fluid; wherein the flow rate detecting mechanism includes an upstream-side coil having a resistor temperature coefficient and a downstream-side coil having the same resistor temperature coefficient as the upstream-side coil, each configured by using a heat-generating resistance wire wound around a sensor flow pipe forming the sensor flow path; and a resistor connected in parallel to only the downstream-side coil, wherein a peak position of a temperature distribution generated in the sensor flow path by the upstream-side coil, the downstream-side coil, and the resistor connected in parallel to only the downstream-side coil is positioned on the upstream-side coil side relative to a middle position between the upstream-side coil and the downstream-side coil on the sensor flow path.