Capacitive miniature tire pressure sensor

Abstract

The invention discloses a capacitive miniature tire pressure sensor. The capacitive miniature tire pressure sensor comprises an upper plate, a supporting plate and a lower base plate, a multi-layer compound film sensitive to pressure is installed on the upper plate, a capacitive upper pole plate is installed in the multi-layer compound film; the upper surface of the supporting plate is provided with a capacitive lower pole plate, and detection capacitance is formed by the capacitive upper pole plate and the capacitive lower pole plate; and the lower base plate is provided with a surface acoustic wave component and a miniature antenna which is connected with the surface acoustic wave component in coupled mode, and the surface acoustic wave component comprises piezoelectric materials and two groups of interdigital electrodes, wherein one group of interdigital electrodes are connected with the miniature antenna, and the other group of interdigital electrodes are respectively connected with the capacitive upper pole plate and the capacitive lower pole plate. The capacitive miniature tire pressure sensor can be embedded inside a tire to work, achieves measurement and result transfer of tire pressure in passive and wireless mode, and has the advantages of being small in size, light in weight, low in cost, and free of maintenance.

Description

technical field [0001] The invention belongs to the technical field of tire pressure sensors and relates to a capacitive miniature tire pressure sensor. Background technique [0002] The tire pressure monitoring system monitors changes in tire pressure and prevents tire blowout accidents through early warning, so as to protect the stability of the vehicle and the safety of the drivers and passengers. The tire pressure monitoring sensor is the core component of the whole system, and its working performance directly determines the accuracy and reliability of the monitoring system. According to the configuration, the tire pressure sensor can be divided into two types: active type and passive type. Active sensors need to be powered by batteries to meet the energy needs of the sensor; passive sensors rely on external energy coupling to work. [0003] At present, the tire pressure sensors commercially available in the market are all active types, that is, the pressure sensor, po...

AI Technical Summary

Problems solved by technology

The active tire pressure sensor needs a built-in battery to provide energy, and its volume and weight are relatively large. It is inconvenient to install, has a limited life, and has a single function. Replacing the battery will lead to high maintenance costs and environmental pollution problems. It is no longer possible. Meet the new technology standards and requirements of energy saving and environmental protection,

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