METHOD AND UNIT OF POSITION SENSOR FOR DETERMINING RELATIVE POSITION BETWEEN THE FIRST OBJECT AND THE SECOND OBJECT

摘要

FIELD: measuring equipment.;SUBSTANCE: method for determining relative position between the first housing and a coil is carried out using a position sensor unit. The position sensor unit comprises the first housing, a coil (11), a control unit and a sensor circuit (12). The first housing is mutually movable in the axial direction with respect to the coil (11). The sensor circuit (12) comprises a comparator (15) connected to the first branch comprising the coil (11), a power switch (16) and a reference resistance (18) connected in series with each other. The comparator (15) is configured to obtain and compare an instantaneous measuring voltage through the reference resistance (18) and an instantaneous transfer voltage, to generate a change in the state of the digital output signal based on the mutual correlation between the measuring voltage and the transfer voltage. The method consists in sending an ascending branch of the digital input signal pulse from the control unit to the power switch (16) to create a change in the state of the power switch (16) from opened to closed. In the control unit, the first change in the state of the output signal from the comparator (15) is detected. The realtive position between the first housing (10) and the coil (11) is determined based on the time delay between the ascending branch of the input signal pulse and the first change in the state of the output signal. The method may also consist in detecting the second change in the state of the output signal in the control unit. The realtive position between the first houding (10) and the coil (11) may be determined based on the delay between the first change in the state of the output signal and the second change in the state of the output signal. The position sensor unit is opened.;EFFECT: increased accuracy of determining the realtive position between two objects and reduced energy consumption.;11 cl, 8 dwg