Natural gas detection and temperature alarm system

Abstract

The invention discloses a natural gas detection and temperature alarm system, which comprises an alarm controller, a gas leakage detector and a temperature detector. The alarm controller is installed on the instrument panel and connected with the gas leakage detector and the temperature detector respectively. ; The gas leak detector includes a gas sensor and a signal processing module, and the signal processing module includes a single-chip microcomputer B, an operational amplifier circuit, a voltage acquisition circuit, an AD analog conversion circuit and an output signal terminal. By converting the analog signal into a digital signal, not only can the critical concentration of the natural gas leakage alarm be set according to the needs of different safety levels, but also the temperature of the engine compartment can be detected and controlled, which greatly improves the performance of the alarm system and further improves the safety of the vehicle. Safety; at the same time, the air leakage alarm, engine room temperature display and alarm are integrated into the same system, controlled by the same single-chip microcomputer, and the output is displayed on the same man-machine interface, which reduces the production cost.

Description

technical field [0001] The invention relates to the field of natural gas detection for vehicles, in particular to a natural gas detection and temperature alarm system. Background technique [0002] At present, in order to reduce the air pollution caused by automobiles, the number of automobiles fueled by natural gas, especially urban public transport buses, is increasing year by year. As liquefied gas vehicles fueled by natural gas (CNG) and liquefied petroleum gas (LPG) are becoming more and more popular, due to the characteristics of the gas itself, in a relatively closed space, once the gas leaks into an open flame or leaks into the compartment, it is easy to cause deflagration The phenomenon will endanger the safety of passengers. Fuel must be monitored to prevent gas leaks. [0003] CN104565818A discloses a natural gas detection device for vehicles, including a controller, a signal indicating alarm connected to the controller, a natural gas sensor and a temperature se...

AI Technical Summary

Problems solved by technology

It uses the sensor to detect the concentration of natural gas, and uses the voltage change caused by the change of the sensor resistance to cause the response of the alarm system. This alarm system using a pure analog circuit has poor reliability and stability. Due to the difference in components, the product consistency is poor, and the parameters are not easy. It is difficult to modify and upgrade, and cannot fully meet the needs of vehicle safety. In addition, the temperature monitoring method in the engine compartment uses a temperature sensor to alarm in the form of a pure analog circuit

Therefore, this method also has disadvantages such as poor reliability and stability, poor product consistency, difficult parameter modification, and difficult upgrades.

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