介紹了AT89C2051單片機的性能及特點，分析了巡航控制系統(CCS)的基本原理和結構
特點，確定了輸入輸出信號后，搭建了巡航模擬實驗臺，提出了一種新型巡航控制系統設計方案，即對轉速、節氣門開度雙閉環控制，以模糊PID作為控制算法，改善控制效果。并且自做了實驗臺。通過實驗結果分析，證實了所設計巡航控制系統的合理性和實用性。
關鍵詞：巡航控制系統；車速；節氣門開度；雙閉環；模糊PID
Microprocessor's in automobile cruise system application Guangdong Industry and trade Professional Technology College， Zhao Wen-long Teachers Campus,Guangzhou Technology Teachers College, Li Li-bin College of Engineening,South China Agric.Univ.,Zhzo Zuo-xi Guangdong Industry and trade Professional Technology College，Lin Hui-Hua
Abstract：Function and characteristic having introduced the AT89C2051 monolithic
machines, After analyzing the basic principle and structure traits of Auto CruiseControl System (CCS)and defining input signals and output signals，A CCS simulant equipment was buih up， We brought forward a kind of new control scheme which is that Dual closed—loop controlling method of auto speed and throttle threshold is adopted and controlling arithmetic is parameter adaptive PID． the controlling efect is improved．And from has made the laboratory bench .By an alysis of experimental results，it is confirmed that thecruise control system designed is rational and practica1．
Key words：cruise control system；auto velocity；throttle threshold；dual closed
—loop； Fuzzy PID