METHOD FOR DETECTING THE POSITION OF AN ACTUATOR ELEMENT
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United States of America
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Issued Date -
Nov 28, 2024
app pub date -
Sep 1, 2022
filing date -
Sep 1, 2022
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Abstract
Disclosed is detecting the position of an actuator element of an actuator arrangement, having at least one actuator element movable in two opposing directions by two adjustment elements. The adjustment elements electrically connected via only one two-wire connection to a control unit comprise electrically controllable shape memory alloy wires. A resistance measurement circuit formed in the control unit periodically records the resistance values of the two adjustment elements. At an energization time of a currently actuated adjustment element, the resistance value of the adjustment element and, in a subsequent pause in energization, the resistance value of another adjustment element is determined and stored. The differential value of the two resistance values is compared with pairs of values which are stored in a table and describe a correlation between the resistance differential value and a position of the adjustment element, to determine the position of the actuator element.
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