| 摘要 |
PURPOSE:To detect the average of pulse cycles in high precision during large flow rate by calculating the average cycle or the average air flow rate at every counting of a prescribed number of pulse signals by Karman's vortex street, or every detection of a pulse signal cycle larger than a prescribed time. CONSTITUTION:The pulse output of a Karman's sensor 3 in which an output signal (a) becomes 1 at every generation of Karman's vortex street is counted by a microprocessor 9. If the number is more than the prescribed number, the average pulse cycle is calculated, if it is less than the prescribed number, whether the prescribed cycle is exceeded or not is discriminated. The average pulse cycle is calculated in case >= the prescribed cycle, and the average air flow rate is obtaind in case <= the prescribed number. Further, in calculation of the average pulse cycle, a constant in a prescribed limit is added to a prescribed number and the averaging processing is performed to prepare next processing. |
