針對目前汽車追尾事件頻發問題,提出一種防汽車車前和車后追尾的安全裝置設計。該設計以高性能、低功耗的8位AVR微處理器ATmega8L為核心,結合霍爾式車速傳感器、激光雷達測距裝置和MMA7260QT加速度傳感器,能夠兼顧車前和車后,摒棄以往設計中只考慮車前或車后單一性缺點,尤其適用于高速、夜晚或新手行車。
Abstract:
Aiming at the high frequency of vehicle rear-end collision,a safe device design of anti-vehicle rear-end collision is presented.In the design,the high-performance,low-power8-bit AVR microprocessor ATmega8L is utilized as a core combined with Hall-type speed sensor,laser-radar ranging devices and the acceleration sensor MMA7260QT.The design considers both the front and back of a car,and overcomes the drawbacks of former designs in which only the front or the back of the car is considered,so it is especially suitable for high-speed,night or the beginner’s driving.
介紹了用單片機C 語言實現無功補償中電容組循環投切的基本原理和算法,并舉例說明。關鍵詞:循環投切;C51;無功補償中圖分類號: TM76 文獻標識碼: BAbstract: This paper introduces the aplication of C51 in the controlling of capacitorsuits cycle powered to be on and off in reactive compensation.it illustrate thefondamental principle and algorithm with example.Key words: cycle powered to be on and off; C51; reactive compensation
為提高功率因數,往往采用補償電容的方法來實現。而電容器的容量是由實時功率因數與標準值進行比較來決定的,實時功率因數小于標準值時,需投入電容組,實時功率因數大于標準值時,則需切除電容組。投切方式的不合理,會對電容器造成損壞,現有的控制器多采用“順序投切”方式,在這種投切方式下排序在前的電容器組,先投后切;而后面的卻后投先切。這不僅使處于前面的電容組經常處于運行狀態,積累熱量不易散失,影響其使用壽命,而且使后面的投切開關經常動作,同樣減少壽命。合理的投切方式應為“循環投切”。這種投切方式使先投入的運行的電容組先退出,后投的后切除,從而使各組電容及投切開關使用機率均等,降低了電容組的平均運行溫度,減少了投切開關的動作次數,延長了其使用壽命。