| 摘要 |
<p>PURPOSE:To obtain a wide range of measurement without being restricted by the fluidity of the fluid to be measured by combining the heating metal wire for detecing Kalman's vortex with a function of a hot-wire current meter. CONSTITUTION:Heating metal wires 5 and 5' serving as a hot-wire current meter are provided behind a vortex generator 4 provided in the suction tube leading to the engine. The output of the metal wires 5 and 5' is inputted into the hot-wire circuit section 9 in such a manner that the electric signal VDC is outputted from the output terminal A corresponding to the hot-wire current meter while the AC signal VAC is outputted from the out terminal B corresponding to the Kalman's vortex current meter. When the suction tube 2 is under a fixed vacuum, that is, the sucking pulsation is large, the switch 11 is activated to halt the action of the 12. The output V1 of the hot wire current meter is produced by the signal selection circuit 14. When the sucking pulsation is small, the switch 11 fails to work. Thus, the calibration device 12 calibrates the output V1 of the hot-wire current meter while the output V2 of the Kalman's vortex current meter is produced from the signal selection circuit 14.</p> |
