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    • 4. 发明授权
    • Self-adjusting smoke detector with self-diagnostic capabilities
    • 具有自我诊断功能的自调烟雾探测器
    • US5798701A
    • 1998-08-25
    • US807627
    • 1997-02-27
    • Brian A. BernalDaniel P. CroftKirk R. JohnsonDouglas H. MarmanMark A. Peltier
    • Brian A. BernalDaniel P. CroftKirk R. JohnsonDouglas H. MarmanMark A. Peltier
    • G08B17/10G08B29/18G08B29/24
    • G08B29/24G08B17/10G08B29/185
    • A smoke detector (10) has internal self-adjustment and self-diagnostic capabilities. It includes a microprocessor-based alarm control circuit (24) that periodically checks the sensitivity of a smoke sensing element (20) to a smoke level in a spatial region (12). The alarm control circuit and the smoke sensor are mounted in a discrete housing (25) that operatively couples the smoke sensor to the region. The microprocessor (30) implements a routine (50) stored in memory (32) by periodically determining a floating adjustment (FLT.sub.-- ADJ) that is used to adjust the output (RAW.sub.-- DATA) of the smoke sensing element and of any sensor electronics (40) to produce an adjusted output (ADJ.sub.-- DATA) for comparison with an alarm threshold. The floating adjustment is not greater than a maximum value (ADJISENS) or less than a minimum value (ADJSENS). Except at power-up or reset, each floating adjustment is within a predetermined slew limit of the immediately preceding floating adjustment. The floating adjustment is updated with the use of averages (NEW.sub.-- AVG) of selected signal samples taken during data gathering time intervals having a data gathering duration that is long in comparison to the smoldering time of a slow fire. The adjusted output is also used for self-diagnosis.
    • 烟雾探测器(10)具有内部自我调节和自我诊断功能。 其包括基于微处理器的报警控制电路(24),其周期地检查烟感测元件(20)在空间区域(12)中的烟雾水平的灵敏度。 警报控制电路和烟雾传感器安装在离散的壳体(25)中,其将烟雾传感器可操作地耦合到该区域。 微处理器(30)通过周期性地确定用于调节烟雾感测元件和任何传感器电子器件的输出(RAW-DATA)的浮动调整(FLT-ADJ)来实现存储在存储器(32)中的程序(50) (40)以产生用于与报警阈值进行比较的调整输出(ADJ-DATA)。 浮动调整不大于最大值(ADJISENS)或小于最小值(ADJSENS)。 除了上电或复位之外,每个浮动调整都在紧接在前的浮动调整的预定转差极限之内。 使用在数据采集时间间隔内采集的所选信号样本的平均值(NEW-AVG)进行浮动调整,数据采集持续时间与缓慢火焰的阴燃时间相比较长。 调整后的输出也用于自我诊断。