Patent Application
20200326294
The present invention relates to a method of enhancing judgment of a gas detector which compensates an output signal voltage and recovers a predetermined detection time when a temperature and humidity change, thus enhancing detection to harmful gas.
As far as sense of smell is concerned, it is unable to for human to distinguish gases by using body. Among colorless and odorless gases, there are some gases harmful (such as carbon monoxide) to the human. When human breathe excessive harmful gases, they will cause coma and death. To avoid such a danger, a gas detector is applicable for a detection of harmful gases. Furthermore, carbon dioxide and oxygen are closely related to the quality of human life. For instance, air-conditioning systems use gas detectors to detect carbon dioxide and oxygen concentrations or to detect pollutant concentrations so as to adjust gas concentration or to start air purifier based on gas standard, so a gas detector is important for improving the comfort of human life.
A harmful gas detector converts a specific harmful gas (i.e., a gas to be tested) contained in a gas “generally referred to undetected air” into an element that can be monitored or measured with an appropriate electrical signal (voltage, current, resistance). It is like the smell of animals, commonly known as “electronic nose” so as to detect the harmful gases and to send an output signal voltage (The higher the concentration of harmful gases is, the lower the resistance of the harmful gas detector and the higher the voltage are), and a warning device (such as a flashing light or a buzzer) makes alerts. However, the gas detector makes a comparison based on a curve diagram in which a relationship between a voltage and a concentration of the harmful gases is shown in
A conventional method of detecting the harmful gases by using a gas detector is inefficient, and it is not necessary for the general household users to detect the type of harmful gas. After all, it is necessary to raise the alert and eliminate it when the harmful gas is found. It is important to reserve extra time for safe disposal. As for wasting time to determine what kind of harmful gas is, it is completely useless for general users (and specific harmful gases must be added with odorants according to regulations so as to make people to alert and to dodge the specific harmful gases).
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.
The primary objective of the present invention is to provide a method of enhancing judgment of a gas detector which compensates an output signal voltage and recovers a predetermined detection time when a temperature and humidity change, thus enhancing detection to harmful gas.
A method of enhancing judgment of a gas detector provided by the present invention contains: dividing a voltage difference between an output signal voltage and an environmental detection voltage of the gas detector into several parts, wherein each of multiple detecting processes of the gas detector is captured by a microprocessor at the environmental detection voltage for ten times in each microsecond, and a predetermined detection time of each detecting process is 10 seconds, wherein when a change of the environmental detection voltage changes linearly, the predetermined detection time of each detecting process is shorten to 1/10 second/per time. After three successive detection processes change linearly and a relationship between a time of the environmental detection voltage and a voltage changes linearly, a warning device is started (wherein the gas detector is configured to detect harmful gas). Otherwise, the gas detector judges a natural change in an environment when a temperature and humidity change (i.e., a non-linear change), in the meantime, the microprocessor compensates the output signal voltage and recovers the predetermined detection time when the environmental detection voltage changes so as to maintain the voltage difference at a certain value (for example, the environmental detection voltage is less than 0.5 volts of the output signal voltage, wherein when the microprocessor acquires that the environmental detection voltage produces a 0.1 volt change with a change of the temperature and humidity, the microprocessor requires the output signal voltage to produce the 0.1 volt change so that the environmental detection voltage is less than 0.5 volts of the output signal voltage so as to avoid an error report because the environmental detection voltage is increased and the temperature and humidity change.
The present invention will be clearer from the following description when viewed together with the accompanying drawings, which show, for purpose of illustrations only, a preferred embodiment in accordance with the present invention.
With reference to
While various embodiments in accordance with the present invention have been shown and described, it is clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.
