Speed monitoring device
AssigneeOkuma Corporation
InventorYasukazu Hayashi
Life of this patent
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Abstract
There is provided a speed monitoring device which can use a low resolution position sensor and provide a high speed response without false detection. The speed monitoring device stores, in a memory unit, a permitted margin PM, a comparison distance VC which is a maximum movement distance permitted for a moving element within one cycle period, and positional data P(t−nT) (n is a natural number equal to or less than M) of the moving element obtained from the present time t to M cycles ago. During speed determination, whether |P(t)−P(t−nT)|>VC*n+PM holds true is determined for every integer n from 1 to M. When the inequality holds true, it is determined that the speed exceeds the speed limit.
Claims4
A speed monitoring device for monitoring a speed of a moving element based on positional data output from a position detector every constant cycle T, the speed monitoring device comprising:
- a memory unit which stores at least a permitted movement margin PM, a comparison distance VC which is a maximum movement distance permitted for the moving element within one cycle period, and positional data P(t−nT) (n is a natural number equal to or less than M) of the moving element obtained from present time t to M cycles ago;
- and
- a speed determination unit which determines that the speed exceeds a speed limit when |P(t)−P(t−nT)|>VC*n+PM holds true for at least one of all integers n from 1 to M.
Dependencies are inferred from the claim text.