Gas detector and automobile ventilation system

Details Gas detector and automobile ventilation system Gas detector and automobile ventilation system

2007-09-04

2007-09-04

Raymond, Edward (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Chemical analysis

C073S023200

Reexamination Certificate

active

10048535

ABSTRACT:
It is an object of the invention to provide a gas detecting device capable of relieving the influence of an environment such as a temperature, a humidity or a wind velocity to detect a change in a concentration of a specific gas and an autoventilation system for a vehicle using the gas detecting device.More specifically, a gas detecting device (10) using a gas sensor element (11) changing a sensor resistance Rs depending on a concentration of a gas such as NOx and an autoventilation system (100) for a vehicle according to the invention A/D convert the output of a sensor resistance value converting circuit (14) to acquire a sensor output value S(n), calculates a base value B(n) based on B(n)=B(n−1)+k1{S(n)−B(n−1)}, and furthermore, calculates a difference value of D(n)=S(n)−B(n). When the concentration of the gas is increased so that the difference value becomes greater than a predetermined concentration threshold, a high concentration signal is generated to close a flap (34) and a base value B(n) is calculated by using a coefficient k2which is smaller than k1based on B(n)=B(n−1)+k2{S(n)−B(n−1)}.

REFERENCES:
patent: 4730590 (1988-03-01), Sogawa
patent: 5426937 (1995-06-01), Ohuchi et al.
Japanese Abstract No. 05 157714, dated Jun. 25, 2003, Jun. 25, 1993.

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