Data processing: artificial intelligence – Knowledge processing system
Patent
1996-12-19
1998-09-08
MacDonald, Allen R.
Data processing: artificial intelligence
Knowledge processing system
315209R, 315200R, 315360, G06F 1518, H05B 4100
Patent
active
058060553
ABSTRACT:
An apparatus (20) to control a high intensity discharge lamp (24) by generating fuzzy logic transfer functions (360, 362) with a software package (368). The fuzzy logic transfer functions (360, 362) are applied by a controller (210) for controlling the operation of the lamp (24). The first fuzzy logic transfer function (360) includes both of a lamp ignition membership function and a lamp steady state membership function. The second fuzzy logic transfer function (362) includes a first current error magnitude membership function and a second different current error magnitude membership function. Both of the first and second membership functions functionally related to both of the error current value and a PWM count change value. A current sense resistor (256) provides a signal indicative of lamp current to the controller (210). An internal real time clock (RTC) in the controller (210) measures the amount of time that the lamp (24) is operating and provides a real time signal for use in the controller (210). The controller (210) applies the first and second fuzzy logic transfer functions (360, 362) to control the operation of the lamp (24). The controller (210) provides a control signal on the output (230) in response to both of the signal from the current sense resistor (256) and the signal from the internal timer (RTC) in accordance with both the first and the second fuzzy logic transfer functions (360, 362).
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MacDonald Allen R.
Shah Sanjiv
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