Design Of Passive Keyless Entry System And Research Of The Key Technologies

With the rapid development of automobile electronic technologies, various electronic security devices are installed on vehicles. However cases of having things stolen happened once in a while. The security of private property has been highly concerned all the time. The technology of Passive Keyless Entry (PKE) is one of the hottest research topics of current automobile electronic technologies in recent years, and it meets the development direction of future intelligent safety. In the future, PKE has gradually become car's standard configuration.This paper is concerned with the design and the research of a PKE protosystem after the basic principle and the key technologies of PKE system are thoroughly studied. The design and research work includes: LF transmitting circuit, UHF transmitting circuit and the receiving antenna circuit. As for the design of software and programming, this paper achieves several critical technologies, such as designing the UHF and LF transmitting packets format. The rolling code technologies and the encryption algorithms,which include the KEELOQ algorithm and the AES algorithm, are also analysed and studied. A modified AES encryption algorithm and decryption algorithm are realized.Experiments and overall tests are done for the system, and the results demostrate that the energy consumption, communication range, security of the modified AES algorithm and the running speed on the MCU has satisfied the requirements.