Pressure sensor is a device or device that can feel the pressure signal and convert the pressure signal into usable output electrical signal according to a certain law. It is the most commonly used sensor.  

   Tire is an important part of the car, but also the largest and only direct contact with the ground rubber parts on the car, there is no doubt that the intelligent sensor device in the tire is extremely important.  Because of the sensor chip embedded in the tire, the intelligent tire can record all kinds of information of the product, so as to realize the tracking and network information management of the whole process of tire production, storage, transportation and maintenance service, and increase the product value of the tire. 

   Sensors embedded in the tire monitor the operation of each tire, connect to a cloud server, and transmit data to electronic controllers, such as tire pressure, vertical load, internal temperature and other important data.  If the tire pressure and temperature abnormal, can be timely intervention.  It is understood that at present, in order to ensure the driving safety of all kinds of cars, many car tires are equipped with pressure sensors to detect the change of pressure.  Most tire pressure monitoring systems have two main solutions: direct monitoring and indirect monitoring.  

   Direct tire pressure monitoring refers to the use of pressure sensors installed in the tire, directly measure the tire pressure, and the tire pressure display and monitoring, when the tire pressure is too low or leakage, the system will automatically alarm.  Specifically, the direct tire pressure monitoring system, is installed in the tire intake nozzle or tire tire pressure detection sensor, to detect the tire pressure, tire pressure abnormal will automatically alarm.  The general tire pressure sensor monitoring frequency is every 4 seconds to update the data, safety is very reliable.  In addition, the monitoring system installed in the tire is a built-in monitor, long service life, better temperature measurement performance;  The external tire pressure monitoring sensor is directly mounted on the air nozzle.  　　

   Indirect tire pressure monitoring system, is through the automobile ABS system (anti-lock braking system) wheel speed sensor, to compare the speed difference between tires, in order to achieve the purpose of monitoring tire pressure, however, this monitoring method has a variety of shortcomings, mainly including the inability to display the accurate instantaneous pressure value of each tire,  When the pressure of the same axle or wheel on the same side or all tires drops at the same time, the alarm cannot be given, and the factors such as speed and detection accuracy cannot be taken into account at the same time.