Water Level Measuring Apparatus and Measuring Method
AssigneesNissan Diesel Motor Co., Ltd., Ngk Spark Plug Co., Ltd.
InventorsHideki Matsunaga, Shinji Kumazawa, Masayuki Motomura, Katsunori Yazawa
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Abstract
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, and the filter value FLT is output as a final water level L. Accordingly, even if the surface sloshes and the water level L0 fluctuates up and down, the water level L0 is smoothed by the filter. Hence there is little influence of the liquid sloshing, and the water level measurement accuracy can be improved.
Claims5
A water level measuring apparatus, comprising:
- a water level indicator to measure a water level of a liquid stored in a liquid tank;
- and
- a computer or a control unit including a computer, coupled to the water level indicator, to calculate a filter value by applying a filter with a time constant greater than one second to the water level measured by the water level indicator, and to output the filter value as a water level.
A water level measuring apparatus, comprising:
- a water level indicator to measure a water level of a liquid stored in a liquid tank;
- and
- an electronic circuit to apply a filter with a time constant greater than one second to the water level measured by the water level indicator, and to output the water level to which the filter has been applied.
A water level measuring method, performed by one of an electronic circuit, a computer, or a control unit including a computer, comprising the steps of:
- applying a filter with a time constant greater than one second to a water level signal from a water level indicator that measures the water level of a liquid stored in a liquid tank;
- and
- outputting the water level signal to which the filter has been applied.
Dependencies are inferred from the claim text.