一种汽车防盗钥匙认证系统的可靠性设计

Reliability Design of the Vehicle Anti-theft System

发动机防盗锁止系统具有良好的性价比和极高的安全性能,目前成为首选的汽车防盗装置。该系统的钥匙认证过程需要通过低频无线通信实现,易受汽车复杂环境的影响而无法正常工作。为设计高可靠性的钥匙认证系统,本文通过研究低频通信电路的特性以及分析导致通信失败的原因,提出了设计低频通信电路参数的方法,并利用该方法完成了一个具体的钥匙认证系统的设计,实验结果表明设计的钥匙认证系统可以满足在汽车复杂的环境下保证稳定通信的要求。

Immobilizer, as its good cost-effective and high safety performance, has become the first choice of vehicle anti-theft devices. The process of the key authentication in this system is based on the low-frequency （LF） wireless communication, which is sensitive to the complicated environments in the car. To achieve high reliability, this paper discusses the characteristics of the LF circuit as well as the cause of the failure, presents a method to design the parameters of the LF circuit, and completes the design of a key authentication system with this method. The result of experiment shows that the system is reliable under the complicated environments in the car.