| 摘要 |
<p>A smoke detector (10) with internal self-adjustment capabilities. It includes a microprocessor -based alarm control circuit (24) which periodically checks the sensitivity of a smoke sensing element (20). The microprocessor (30) implements a routine (50) in memory (32) by periodically determining a floating adjustment (FLT_ADJ) that is used to adjust the output (RAW_DATA) of the smoke sensing element and electronics (40) to produce an adjusted output for comparison with an alarm threshold. At power up or reset each floating adjustment is within a predetermined slew limit of the immediately preceding floating adjustment. The floating adjustment is determined by averages (NEW_AVG) comprised of data gathering intervals that are long enough to detect a smoldering fire.</p> |
