JP2020173745A - Method for improving determination of harmful gas detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for improving the judgment of a harmful gas detector. According to the present invention, the voltage difference between the output signal voltage of a harmful gas detector and the environment detection voltage is set by dividing it into a large number of equal parts in advance, and each detection history process of the harmful gas detector is micro. It consists of the environment detection voltage captured 10 times continuously by the processor every 10 seconds, and in the scheduled detection, the detection history process is performed once every 10 seconds, and the fluctuation in the environment detection voltage changes linearly. If it appears to be present, the scheduled detection enters the congestion detection state once every tenth of a second, and activates the alarm when the three consecutive detection history processes exhibit a linear change. If this is not the case, the output signal voltage is compensated based on the fluctuation of the environment detection voltage and transmitted in response to the scheduled detection, thereby prompting the maintenance of the voltage difference between the two at a constant value. [Selection diagram] Fig. 2

Description

The method for improving the judgment of the harmful gas detector according to the present invention is that the detection history process of the harmful gas detector is composed of the environment detection voltage captured by the microprocessor, and the change value shows a linear change. Dense detection is performed on the detected voltage, and the alarm is activated when the detection history process that detects congestion three times in a row shows a linear change. If not, the output signal voltage is based on the fluctuation of the environment detection voltage. By compensating and transmitting in response to the scheduled detection, the harmful gas detector can prompt the compensator to perform compensation in response to changes in temperature and humidity, and can enhance the detection reaction of the harmful gas.

As for the human sense of smell, there is a property that the sensory organs of the body cannot be used to identify what a gas is. Therefore, there are several gases that are harmful to the human body among the colorless and odorless gases. For example, when humans ingest excessive carbon monoxide, the humans fall into a coma and die. There is a risk of connection, but if it can be detected using a gas detector and appropriate treatment is applied, personal safety can be ensured. In addition, since carbon dioxide and oxygen are closely related to the quality of human life, it is necessary to use a gas detector to detect carbon dioxide concentration, oxygen concentration and contaminated gas concentration in the air conditioning system. Otherwise, it would be impossible to adjust the gas concentration or activate the air purifier to comply with the standard, and the importance of the gas detector in improving the comfort of life for humans. Well found.

A harmful gas detector is a monitoring measurement that converts a specific harmful gas (that is, the gas to be measured) contained in a so-called gas (generally referring to air) into an appropriate electric signal (voltage, current, electric resistance). Or, it is a part that enables measurement, and the part that corresponds to the sense of smell of an animal is commonly called an "electronic nose". It is possible to output a signal voltage (the higher the concentration of harmful gas, the lower the electrical resistance of the harmful gas detector and the higher the voltage) for the detection reaction of harmful gas via the harmful gas detector. Yes, it activates an alarm (eg, flashing light, buzzer) to give an alarm. However, the harmful gas detector, which has been known for a long time, compares the relationship curve graph between the voltage and the concentration of the harmful gas (detects any kind of harmful gas as shown in FIG. 1) and emits a signal voltage. It was difficult to meet the high safety usage requirements because the reaction time was too long and the sensitivity was insufficient.

With regard to the detection method of the conventional harmful gas detector, it is difficult to react quickly, and it is not always necessary for general household users to detect the type of harmful gas, and once again, the detection of harmful gas is necessary. When it appears, it must be eliminated with a high degree of caution, and it is of utmost importance to reserve extra time in advance for safety measures. For the average user, wasting time deciding what kind of harmful gas is completely useless (and certain harmful gases are dangerous because they warn people. It is necessary to add odorants in accordance with legal regulations so that you can protect yourself).

In the method for improving the judgment of the harmful gas detector according to the present invention, the voltage difference between the output signal voltage of the harmful gas detector and the environment detection voltage is set in advance by dividing it into a large number of equal parts, and the linearity is changed. The alarm is activated when the detection history process shows a linear change in the detection history process that performs congestion detection for the environment detection voltage that exhibits, and the congestion detection continues three times. If not, the output signal voltage is set to the environment detection voltage. By compensating based on the fluctuation and transmitting in response to the scheduled detection, the harmful gas detector can be prompted to perform compensation in response to changes in temperature and humidity. By this method, the following effects are achieved.

Each individual detection history process of the present invention is composed of the environment detection voltage captured 10 times continuously every microsecond by the microprocessor, and performs the detection history process once every 10 seconds in the scheduled detection. If the change in the environmental detection voltage appears to show a linear change, the scheduled detection goes into the dense detection state once every tenth of a second, and the detection history process is three times in a row. When a linear change is shown in the comparison diagram of the relationship between time and voltage, it is representative to activate the alarm when harmful gas is detected, otherwise it is a natural change according to temperature and humidity fluctuations ( (Non-linear change) is determined, and at this time, the output signal voltage is compensated based on the fluctuation of the environment detection voltage by the microprocessor and transmitted in response to the scheduled detection to maintain the voltage difference between the two at a constant value. (For example, when the environment detection voltage is set 0.5V lower than the output signal voltage, when the environment detection voltage acquired by the microprocessor fluctuates by 0.1V according to temperature and humidity fluctuations. In addition, the environment detection voltage is maintained at a state set 0.5V lower than the output signal voltage by causing the output signal voltage to fluctuate by 0.1V relative to the output signal voltage), due to temperature and humidity. It is possible to prevent the occurrence of false reports due to an increase in the detection voltage.

It is a relationship curve graph of the conventional voltage and concentration. It is a relationship curve graph of the voltage and time of the harmful gas detector of this invention.

The method for improving the judgment of the harmful gas detector according to the present invention is to set the voltage difference between the output signal voltage of the harmful gas detector and the environment detection voltage by dividing it into a large number of equal parts in advance (in the present invention). , This voltage difference is divided into 100 equal parts), each detection history process of the detector is composed of the environment detection voltage captured 10 times continuously every microsecond by the microprocessor, and in the scheduled detection If the detection history process is performed once every 10 seconds and a linear change appears in the comparison diagram of the relationship between the time and voltage of the environmental detection voltage (see Fig. 2), it is scheduled. The detection enters the congestion detection state that executes one detection every one tenth of a second, and activates the alarm when the detection history process in which the congestion detection continues three times shows a linear change (harmful gas detection). The vessel is originally designed so that the electrical signal generated in response to the presence of harmful gas changes), otherwise it is judged to be a natural environmental change (non-linear change) according to temperature and humidity fluctuations. At this time, by compensating the output signal voltage based on the fluctuation of the environment detection voltage by the microprocessor and transmitting it in response to the scheduled detection, it is urged to maintain the voltage difference between the two at a constant value (for example, environment detection). When the voltage is set 0.5V lower than the output signal voltage, the output signal voltage is output by the microprocessor when the environment detection voltage acquired by the microprocessor fluctuates by 0.1V in response to temperature and humidity fluctuations. The environmental detection voltage is maintained at a state set 0.5V lower than the output signal voltage by generating a relative fluctuation of 0.1V), and false reports due to an increase in the detection voltage due to temperature and humidity. Occurrence can be prevented (the microprocessor provides compensation for the environmental detection voltage and can respond to natural changes in the environment due to temperature and humidity fluctuations, so there is no need to additionally install a temperature sensor or humidity sensor).

Claims (2)

The voltage difference between the output signal voltage of the harmful gas detector and the environment detection voltage is set by dividing it into a large number of equal parts in advance, and the detection history process of each of the harmful gas detectors is continuously performed 10 times by the microprocessor. It consists of the environment detection voltage captured every microsecond, and in the timely detection, the detection history process is performed once every 10 seconds, and when the fluctuation of the environment detection voltage shows a linear change, the timely detection is performed. The alarm is activated when the detection history process, which enters one congestion detection every one tenth of a second and the congestion detection continues three times, shows a linear change, and otherwise detects the output signal voltage to the environment. A method for improving the judgment of a harmful gas detector, which is characterized by encouraging the voltage difference between the two to be maintained at a constant value by compensating based on the fluctuation of the voltage and transmitting the response to the scheduled detection. The method for improving the judgment of the harmful gas detector according to claim 1, wherein the division into a large number of equal parts is divided into 100 equal parts.

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