| 摘要 |
A water level measuring apparatus and a water level measuring method, in which a water level L0 of a liquid is read from a water level indicator secured to a liquid tank, and a filter value FLT is calculated by applying a filter with a time constant greater than one second to the water level L0. Furthermore when the filter value FLT is less than a minimum value Min, the minimum value Min is sequentially updated with the filter value FLT. Then the minimum value Min is output as the final water level L. Accordingly, even if the surface sloshes and the water level L0 fluctuates up and down, by adopting the minimum value that utilizes the characteristic of the surface fluctuations, as the final water level L, there is little influence of the liquid sloshing, and the water level measurement accuracy can be improved. |
