There are many kinds of pressure sensors, which can be divided into gauge pressure sensors, differential pressure sensors and absolute pressure sensors according to the type of test pressure. Among them, the heavy-duty pressure sensor is widely used in the field of transportation because it can withstand large pressure, such as monitoring the pressure changes of key systems such as pneumatic, light-load hydraulic, brake pressure, etc. There are various working principles of pressure sensors, including piezoresistive, piezoelectric and capacitive. Each principle has its unique advantages and scope of application, such as piezoresistive sensors by measuring the change in resistance value to determine the pressure, while piezoelectric sensors use the piezoelectric effect to generate voltage signals.