The algorithm in this paper uses the time derivatives of smoke levels, CO, and CO2 concentrations. Fig. 4 illustrates the decision tree for this algorithm. Initially, the rate of increase of smoke level is checked continuously. If its rate of rise exceeds its predetermined threshold rate, then the SMOKE_Alarm parameter is set to 1; otherwise, the SMOKE_Alarm parameter remains 0. When the SMOKE_Alarm parameter is set to 1, the rates of rise of CO and CO2 concentrations are then checked simultaneously. And, if either the rate of rise of CO or CO2 concentration exceeds their corresponding predetermined threshold rate, then either CO_Alarm parameter is set to 1 or CO2_Alarm parameter is set to 1. When either CO_Alarm or CO2_Alarm parameter is set to 1, a fire alarm is initiated; otherwise, no fire alarm is set off and the next rate of increase of smoke level is computed and checked again. The performance of this fire alarm algorithm is compared to that of a smoke detector which alarms when its output signal exceeds a threshold value. The fire alarm algorithm described herein is patented [11].
The algorithm in this paper uses the time derivatives of smoke levels, CO, and CO2 concentrations. Fig. 4 illustrates the decision tree for this algorithm. Initially, the rate of increase of smoke level is checked continuously. If its rate of rise exceeds its predetermined threshold rate, then the SMOKE_Alarm parameter is set to 1; otherwise, the SMOKE_Alarm parameter remains 0. When the SMOKE_Alarm parameter is set to 1, the rates of rise of CO and CO2 concentrations are then checked simultaneously. And, if either the rate of rise of CO or CO2 concentration exceeds their corresponding predetermined threshold rate, then either CO_Alarm parameter is set to 1 or CO2_Alarm parameter is set to 1. When either CO_Alarm or CO2_Alarm parameter is set to 1, a fire alarm is initiated; otherwise, no fire alarm is set off and the next rate of increase of smoke level is computed and checked again. The performance of this fire alarm algorithm is compared to that of a smoke detector which alarms when its output signal exceeds a threshold value. The fire alarm algorithm described herein is patented [11].
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