Matching Method of RF Antenna for Tire Pressure Monitoring Sensor Based on Valve Core Antenna

Abstract

The invention relates to the technical field of radio frequency debugging, in particular to a method for matching the radio frequency antenna of a tire pressure monitoring sensor based on a valve core antenna. The matching method includes: performing impedance matching on the antenna of the tire pressure monitoring sensor through an impedance matching network; installing the tire pressure monitoring sensor with the antenna impedance matching completed on the wheel hub, adjusting the impedance matching network parameters of the antenna, and detecting the antenna in the far field. The radiation field intensity is matched and debugged; step c: when the tire pressure monitoring sensor that matches the antenna and the wheel hub is filled and sealed, the glue filling of the circuit components affected by the glue filling and sealing in the impedance matching network is isolated, and the The impedance matching network parameters of the isolated circuit components are adjusted to complete the matching between the physical unit and the "antenna + hub". The invention improves the emission intensity of the sensor and the radiation efficiency of the antenna, and solves the problem of unstable communication between the sensor and the receiver.

Description

technical field [0001] The invention relates to the technical field of radio frequency debugging, in particular to a matching method of a tire pressure monitoring sensor radio frequency antenna based on a valve core antenna. Background technique [0002] During the high-speed driving of a car, tire failure, especially a puncture, often catches the driver off guard due to its accidental and unpredictability, which is also one of the important reasons for sudden traffic accidents. In recent years, with the extensive deepening and application of automobile driving safety systems, in order to prevent tire blowouts and change passive safety into active safety, automobile tire pressure real-time monitoring system (Tire Pressure Monitoring System, TPMS) is gradually becoming an indispensable guarantee for vehicle driving safety. safety device. The TPMS system mainly consists of two parts: the tire pressure monitoring sensor installed on the wheel hub of the car and the receiver in...

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Problems solved by technology

[0004] 1. The front-mounted TPMS usually adopts a built-in sensor solution. The sensor module is separated from the outside world by wheels, which makes the anti-interference design of the sensor module’s antenna very difficult. There are generally problems of low transmission efficiency and serious system data loss.

When passing through the complex traffic electromagnetic environment, due to the poor anti-interference performance of the antenna, the sensor module is frequently disconnected from the receiver, which affects the performance of the entire TPMS;

[0005] 2. Since the rear-mounted TPMS mostly adopts an external solution, the antenna matching of the sensor module is easy to design, but because the sensor module is exposed to the outside of the tire for a long time, the working environment is harsh, and the service life is very short; and it is easily interfered by external signals, causing the receiver Frequent false positives, poor customer experience

However, based on the disadvantages of the existing TPMS, the effective transmission distance of the sensor module is limited due to factors such as the lack of ideal matching of the antenna, the vehicle environment, and the surrounding complex electromagnetic interference when the sensor module transmits tire information through the valve core antenna. Cause data loss, false alarm or disconnection of the receiver

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