Method and apparatus for calibrating and controlling multiple he

Details Method and apparatus for calibrating and controlling multiple he Method and apparatus for calibrating and controlling multiple he

1990-11-05

1994-01-18

Smith, Jerry

Boots, shoes, and leggings

219486, 219497, 374 1, 364477, G05B 1101, H05B 102

Patent

active

052804224

ABSTRACT:
Multiple heaters are calibrated and controlled by a microcomputer, and a multiplexer of this system. The heaters are sequentially sampled and resistance calculated from voltage and current measurements. The operator enters a temperature for the calculated resistance to establish a calibrated resistance value. During run, the computer energizes and samples each heater to calculate its resistance. The calculated resistance is divided by the calibrated resistance to determine a resistance ratio. A look-up table is stored in the computer having resistance ratios for corresponding temperatures. The computer compares the calculated ratio to that of the look-up table to determine actual heater temperatures. Based upon heater temperatures, the computer controls energization of the heaters until set points are achieved.

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