| 摘要 |
PROBLEM TO BE SOLVED: To provide a railroad crossing obstacle sensing device capable of reliably sensing even an obstacle in which circumstances such as height, area or size are changed.SOLUTION: An arithmetic processing unit 20 includes: a detection means 21 for detecting a sensing level inputted from a sensing means in time series by using two thresholds of a lower threshold and an upper threshold with respect to the sensing level at every prescribed interval on an obstacle sensing region of the sensing means 10; a storage means 22 for storing a detection result of the detection means in time series; and a judgement means 23 which judges that, when a detection result on an arbitrary interval of the obstacle sensing region of a present period is the upper threshold or more, there is an obstacle and continues such judgement that there is an obstacle when a detection result on an arbitrary interval of the obstacle sensing region is the lower threshold or more and is less than the upper threshold and a detection result on the same interval of the obstacle sensing region of the just preceding period is the upper threshold or more, or when the detection result on the same interval of the obstacle sensing region is retroactively determined in time series and can be attained to the upper threshold or more without passing through a region less than the lower threshold.SELECTED DRAWING: Figure 1 |
