Air Pressure Sensor Working Principle

A tpms reports real time tire pressure information to the driver of the vehicle either via a gauge a pictogram display or a simple low pressure warning light tpms can be divided into two different types direct dtpms and indirect.

Air pressure sensor working principle.

A pressure sensor is a device for pressure measurement of gases or liquids pressure is an expression of the force required to stop a fluid from expanding and is usually stated in terms of force per unit area. All modern pressure sensors use the same basic working principle and same overall design. The reference cavity is typically sealed at a low vacuum pressure. Direct tire pressure monitoring systems use individual sensors inside each tire and sometimes a full size spare to transmit information to a central control module the sensors read internal pressure and sometimes temperature.

For the purposes of this article such a signal is electrical. A tire pressure monitoring system tpms is an electronic system designed to monitor the air pressure inside the pneumatic tires on various types of vehicles. The tpms sensor batteries have an expected life of 7 10 years. Therefore a pressure sensor is an instrument consisting of a pressure sensitive element to determine the actual pressure applied to the sensor using different working principles and some components to convert this information into an output signal.

Electrical charge will be proportional to the applied pressure. Working of piezoelectric sensor. When a battery in any of the sensors has died the vehicle will illuminate the tpms warning ind. The information received at the module is analyzed and any issues with any of the tires are sent to the car s vehicle information system or low pressure light.

A pressure sensor usually acts as a transducer. A tire pressure sensor is a small programmable electronic device located in the pressurized pocket made by a wheel and tire that constantly measures the air pressure inside the tire. It generates a signal as a function of the pressure imposed. When pressure or acceleration is applied to the pzt material an equivalent amount of electrical charge gets generated across the crystal faces.

The membrane covers a reference cavity. The pressure sensor has a thin membrane that is flexible and can deform.