The anti-theft system of modern automobiles usually adopts the method of anti-theft warning for the impact and vibration monitoring of the car body, and most commonly used are magnetic effect sensors. Although its sensitivity is very good, its frequency response is unstable due to assembly and installation errors, resulting in lower reliability of the system alarm and higher false alarm rate. In addition, the method of trailer or whole vehicle handling is also a common means of stealing and stealing cars. The most effective way to deal with such theft is to monitor the tilt angle of the car body, and the magnetic effect sensor cannot measure the static acceleration. Monitor and warn this. In short, there is a need for a more reasonable and reliable tilt sensor instead.
The mainstream uses low-cost, low-power, single-chip integrated dual-axis accelerometers fabricated using MEMS technology.
NA5200 series 9~30V wide voltage supply, can measure the inclination angle within ±90°, resolution up to 0.001° to 0.005°, high impact resistance 500g, good anti-electromagnetic interference capability, reliability and stability, low noise, low temperature Drifting, no drift; can monitor the slight vibration of the car body and the tilt angle of the vehicle at the same time. Applying it to the car anti-theft system not only expands the monitoring range of the system, but also simplifies the system and improves the reliability of the anti-theft system.
Generally, for the theft method of the trailer or the whole vehicle, if the angle of the vehicle body changes by 5° with respect to the initial state, it can be determined that the car theft has occurred. Connect the sensor to the transceiver unit to issue an alarm or other information in a timely manner.
In addition, through the measurement of the small vibration of the car body, the monitoring of the behavior of the car body can be realized. If the energy of the vibration exceeds the set threshold within a short period of time, it can be determined that the damage to the car occurs.
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