The Research&Design Of Passive Keyless Entry Based On Bus Technology

With the rapid development of modern automotive technology, How to improve anti-theft security and function of vehicle is the main research direction of automobile electronic technology.It is also the earnest hope of users. Passive keyless entry is developed on the base of remote keyless entry technology. Much attention be paid to its security and convenience.In this paper,we combine CAN/LIN bus technology with PKE technology. Designed a kind of PKE system which has good performance of anti-theft.The major work completed in this paper:First, after analysing the characteristics of the hybird bus.Focused on PKE technology, combined the versatility of hybrid bus with the security of the PKE system. Propose a PKE system design based on hybrid bus technology.Second, based on the characteristics of keyless entery and the actual working environment of the vehicle. In this paper, we take the PKE node as a separate CAN nodes into the bus network. Completed the hardware and software design of the PKE system.Third, the encryption technology based on hardware of Microchip has many shortcomings.So we designed a kind of rolling code encryption and decryption algorithm based on the DES to improve the security and scalability. To prevent the error operation,we introduced the judgment of the window.By this means, we improved the reliability of the PKE system.At the end of this paper, introduced the method of testing system with CANoe.On the test car, we completed function test and security test for all of nodes including PKE.