车内一氧化碳浓度监测及应急系统设计

CARBON MONOXIDE CONCENTRATION MONITORING AND EMERGENCY SYSTEM DESIGN IN THE VEHICLE

本设计是通过使用MQ-7一氧化碳浓度传感器实时监测车内一氧化碳浓度,并通过声光报警和强制打开车窗的应急措施,达到预防车内一氧化碳中毒危险的发生。该系统采用AT89S52单片机为控制单元;使用高灵敏的MQ-7一氧化碳浓度传感器实时监测车内一氧化碳浓度;由蜂鸣器和LED构成声光报警系统;在关闭车窗的开关和电机之间串联常闭式继电器,在打开车窗的开关两端并联一条加装常开式继电器的支路。当系统处于应急状态时,常开式继电器开关闭合,类似将车窗开关闭合,电路导通,打开车窗,同时,常闭式继电器断开,使关闭车窗的开关失效。当处于非报警状态时,则恢复原来状态。

This design uses the MQ-7 carbon monoxide concentration sensor to monitor the concentration of carbon monoxide in the vehicle in real time and to prevent the risk of carbon monoxide poisoning in the vehicle through emergency measures such as sound and light alarm and forced opening of the window.The system uses AT89S52 single-chip microcomputer as the control unit;uses the highly sensitive MQ-7 carbon monoxide concentration sensor to monitor the carbon monoxide concentration in the vehicle in real time;the buzzer and LED constitute the sound and light alarm system;and the series connection between the switch and the motor that closes the window A normally closed relay,in which a branch of a normally open relay is connected in parallel at both ends of the switch that opens the window.When the system is in an emergency state,the normally open relay switch is closed,similar to closing the window switch,the circuit is turned on,and the window is opened.At the same time,the normally closed relay is disconnected,and the switch for closing the window is disabled.When in the non-alarm state,the original state is restored.