Gas detection apparatus and automatic ventilation system for...

Details Gas detection apparatus and automatic ventilation system for... Gas detection apparatus and automatic ventilation system for...

2005-02-22

2005-02-22

Raymond, Edward (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Chemical analysis

C073S001020

Reexamination Certificate

active

06859737

ABSTRACT:
A gas detection apparatus incorporating a gas sensor element and a vehicle automatic ventilation system including the apparatus in which a sensor output value S(n) is obtained, and a base value B(n) is calculated by use of Expression (1): B(n)=B(n−1)+k1[S(n)−B(n−1)]−k2[S(n)−S(n−5)] in the case where S(n)≧B(n−1), or by use of Expression (3): B(n)=S(n) in the case where S(n)<B(n−1), followed by calculation of a difference value D(n); i.e., S(n)−B(n). When the difference value exceeds a predetermined high connection threshold, a high-concentration signal is generated to close a flap. After that, the base value B(n) is calculated by use of Expression (4): B(n)=B(n−1)+k3[S(n)−B(n−1)]−k4[S(n)−S(n−5)]. When the difference value becomes smaller than a predetermined low-concentration threshold, a low-concentration signal is generated to open the flap.

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