Thermal measuring and testing – Temperature measurement – By electrical or magnetic heat sensor
Patent
1994-07-27
1997-07-08
Dombroske, George M.
Thermal measuring and testing
Temperature measurement
By electrical or magnetic heat sensor
361161, G01K 700
Patent
active
056453523
ABSTRACT:
A circuit configuration and method for ascertaining the temperature of a current-regulated electric coil, in particular the coil of an electromagnetic proportional valve of a hydraulic regulating device, by measurement of an ohmic resistance of a winding of the coil, includes a coil current circuit in which the coil and other resistances are connected. A control and evaluation circuit is connected to the coil current circuit and has a pulse-width modulated regulating signal for regulating a mean current through the coil. A temperature sensor is connected to the control and evaluation circuit. The control and evaluation circuit ascertains a correction value once the temperature of the coil has been aligned with the temperature of the temperature sensor, taking into account an influence of interference of the other resistances in the coil current circuit upon the temperature thereof. The temperature of the coil is calculated from a supply voltage to the coil, a pulse-interval ratio of the coil current, and the coil current itself, taking the correction value into account.
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Patent Abstracts of Japan, vol. 7, No. 150 (P-297)[1295] Jun. 30, 1983 & JP-A-58 061 432 (Tokyo) Apr. 12, 1983.
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Patent Abstracts of Japan, vol. 7, No. 234 (P-230)[1379] Oct. 18, 1983 & JP-A-58-121 419 (Matsushita) Jul. 1983.
Amrozowicz Paul D.
Dombroske George M.
Greenberg Laurence A.
Lerner Herbert L.
Siemens Aktiengesellschaft
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