Method and device for detecting and alarming of noxious gas inside automobile

Abstract

The invention relates to an inspecting and alarming device for poisonous gas in automobile, comprising gate circuit of delay switch for inspecting if the time when automobile is in idle speed and motion state achieves the setting value. When the time achieves the setting value the signal is emitted and the inspecting circuit is opened. CO sensor is set in the inspecting circuit to collect the concentration signal of CO and transform the signal into voltage signal, which is amplified subsequently. When amplified voltage signal achieves the setting value alarm is started while three signals are outputted. One signal output is used to control car window to open; another signal output is used to control engine to close and the residual signal output is used to open anti-theft alarming device. By adopting the method of opening inspection circuit automatically, the device prolong the using time of sensor greatly while the problem that in the original technology only alarm can be started and the source of poisonous gas can not be cut is conquered. The safety is increased. It is provided with simple structure, strong practicability. It is widely applied in various automobiles.

Description

technical field [0001] The invention relates to a toxic gas alarm device, in particular to an alarm method and device for detecting toxic gas in an automobile. Background technique [0002] In recent years, reports on TV, newspapers, and the Internet have been common about poisoning or even death caused by prolonged use of the air conditioner in closed carriages due to sleep or other reasons. The incidents mostly occur in summer and winter, and the main causes are car owners or passengers. When the air conditioner is turned on in the car (for heating or cooling) to rest, the resulting carbon monoxide cannot be discharged in the small and relatively sealed space of the car, thus causing carbon monoxide poisoning, which usually leads to death because the poisoned person will lose consciousness . A large number of fatal accidents caused by carbon monoxide poisoning in vehicles take place in our country every year. [0003] According to tests, when the car is running normally,...

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Problems solved by technology

[0008] The above-mentioned carbon monoxide alarm devices all input the signal collected by the sensor into the alarm circuit, and after the concentration is exceeded, the sound and light alarm is sent out. The engine was turned off due to the situation, resulting in the source of the poisonous gas not being cut off even though there was an alarm sound. At this time, the occupants in the car are usually poisoned, unconscious or comatose, and it is difficult to respond to the alarm sound.

2. The alarm system fails to open the car window, because the air is still not circulating, so the concentration of carbon monoxide in the car is still high, which will continue to endanger the health of the occupants

3. The use time of the sensor is short. Since the sensor needs to be turned on all the time, the use time within the life of the sensor (generally 900 hours) will be relatively short, usually about half a year. Because the sensor is more expensive, the cost will increase significantly

4. The alarm circuit generally uses a 9V battery, which requires frequent replacement of the battery, causing trouble to the user

The carbon monoxide alarm device in the car (patent number: CN2707566Y) invented by Zhou Weizhong of Guangdong Province in 2003 provides the functions of opening the car window and shutting down the engine, but it still does not solve the problems of the short service life of the sensor and frequent replacement of the battery. Quite high, and requires frequent replacement of batteries and sensors, limited application range

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