| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an air flow rate measuring device 1 improving measurement detection accuracy of an air flow rate by suppressing deposition of intake dust on the upstream/downstream ends of a chip support member, concerning a thermal air flow rate measuring device having a chip sensor structure. <P>SOLUTION: A bypass flow is formed by taking a part of air flowing along the main channel 6 of an intake pipe 2 into a bypass channel 7 of a sensor body 3, and besides a sub-bypass flow is formed by taking a part of the bypass flow into a sub-bypass channel 8 deflected approximately rectangularly. A flow rate measuring element 40 having a chip sensor structure of a flow rate sensor 4 is disposed in a direction orthogonal to the sub-bypass flow. The upstream end 44 of the support member 43 of the flow rate sensor 4 is arranged slantingly with respect to the sub-bypass flow. Hereby, a split flow to a tilt direction of the flow is generated, and generation of a stagnation of the flow is suppressed, to thereby suppress deposition of intake dust. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
