Patent ID: 8990044
Filing Date: 2015-03-24
Classification: G01D

Abstract:
1. A revolution counter for determining the number of revolutions of a shaft, the revolution counter comprising: sensors, with which position values that define an angular position of a shaft are generated; a determination unit that receives said position values from said sensors and generates decision signals from said position values, wherein said decision signals determine counting sectors within one revolution of said shaft; a counting control unit that receives said counting sectors from said determination unit, wherein said counting control unit, which as a function of a chronological order of said counting sectors operates said revolution counter in a first mode of operation or in a second mode of operation, and said counting control unit switches over to said second mode of operation, which is an energy-saving pulsed mode, if after a defined length of time no change in one of said counting sectors takes place, and switches over to said first mode of operation if a change in one of said counting sectors does take place; wherein said determination unit determines an uncertainty range between each pairing of said counting sectors; and said counting control unit does not take said uncertainty ranges which adjoins one of said counting sectors that has led to a switchover to said second mode of operation into account for said switchover from said second mode of operation to said first mode of operation.