Low-frequency calibration system and method of key-free access control system for car
A calibration system and key door technology, which is applied in the field of automatic calibration system of radio frequency field strength of vehicle radio frequency components, can solve problems such as high cost, and achieve the effects of automation, high measurement efficiency and cost reduction
Active Publication Date: 2012-05-23
CHONGQING CHANGAN AUTOMOBILE CO LTD
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Problems solved by technology
Existing field strength test schemes must be implemented using standard receiving antennas and standard receivers, which is not only expensive, but also the test results need to be compared with the actual antenna before they can be used for system calibration
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[0026] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings.
[0027] Such as figure 1 Shown is a schematic diagram of the measurement module of the present invention. The measurement module consists of three parts: a low-frequency receiving antenna, a chip with RSSI function and a data interface circuit. It can use the low-frequency receiving antenna used by the smart key in the PEPS system and an integrated circuit with a received signal strength indicator (RSSI) function to make a measurement module. (such as NXP Semiconductors' PCF7952), the low-frequency magnetic field signal received by the low-frequency receiving antenna is converted into a digital signal through an integrated circuit with RSSI function, and transmitted to the industrial computer through the data interface circuit.
[0028] as attached figure 2 Shown is a schematic diagram of an industrial computer, which has an RS232 ...
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The invention discloses a low-frequency calibration system and a method of a key-free access control system for a car. The low-frequency calibration system comprises a three-dimensional mechanical orientator, an extensive rod which is fixed on a Y axis of the three-dimensional mechanical orientator, a measuring module which is fixed on one end of the extensive rod, and an industrial personal computer and a calibration software which are connected with the measuring module and the three-dimensional mechanical orientator, wherein the measured route planning is realized by the calibration software, the three-dimensional mechanical orientator realizes the automatic and continuous positioning of the measuring module, and a positioning confirmation signal which is fed back by the three-dimensional mechanical orientator and triggers the calibration software to store point coordinates and the relevant measurement results. A low-frequency receiving antenna for an intelligent key in a PEPS system and an integrated circuit with a function for receiving the signal strength indication are utilized to produce the measuring module, so the expensive standard low-frequency receiving antenna and the standard receiver are unnecessary to buy, the cost of the calibration system is reduced. At the same time, the measurement results are free from calibrating with the real antenna, the receiving situation of the low-frequency receiving antenna in the real application can be directly represented, the measuring process realizes the automation, and the measuring efficiency is high.
Description
technical field [0001] The invention relates to a radio frequency field strength calibration system and method, in particular to a radio frequency field strength automatic calibration system and method for vehicle radio frequency components. Background technique [0002] Keyless entry system (PKE) is developed on the basis of remote keyless entry (RKE). As a new generation of anti-theft technology, it is gradually developing and growing. At present, it has gradually entered the mid-range car market from the high-end car market. PKE is not a traditional key, but a smart key, similar to a smart card. When the driver carries the smart key and steps into the specified range, the system will recognize and judge the smart key, and if it is a legal smart key, it will automatically unlock it. Once in the car, the driver only needs to press a button to start the ignition. [0003] Among the patents published by the Patent Office of my country, a keyless system for a car and its com...
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IPC IPC(8): G01R29/08E05B19/00
Inventor 雷剑梅申建刘洋
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD