【正文】
ast model output39。s tooth rings on the axle tree,turns a fast sensor39。s braking force,realizes against holds the dead brake,its structure mainly by a round fast sensor,the controller(puter)and the solenoid valve is accurate meter wheel fast,the sensing and between the wheel tooth ring should leave leeway the 1mm order to avoid the water,the putty,the dust to the sensor influence,before the installment,should the sensor replenishment solenoid valve uses in wheel brake39。When Alpja is small,the control goal reduces the over modulation,but the response process is uses the belt two Alpha values the modification factor exptessions to be able to request on the satisfiability,namely: u =α X E + (1α )EC And,modification factor α1,α2 in (0,1). Logical threshold value control This method establishes some control limit advance to certain controlled variable(threshold)the value,when applies the brake,according to the putation realtime parameter value and the corresponding threshold value39。s glide rate to approach hypothesis goal S0 by the quickest way. The glide modality changes the structure control Against holds the dead brake by the automobile basic principle to be possible to know,its brake process39。s glide rate control in certain scope,use fully between the tire and the road surface adhesion,reduces the stopping distance effectively,obviously enhances when the car braking controllability and stability,when each kind of traffic accident which has avoided the wheel hugs dies easy to with brake intensity39。 譯 文 原文題目: Automobile antilock braking system design 譯文題目: 汽車防抱死系統(tǒng)設(shè)計(jì) 學(xué) 院: 機(jī)電工程學(xué)院 專業(yè)班級: 機(jī)械工程及自動化 09 級( 3) 班 學(xué)生姓名: xxxxxxx 學(xué) 號: xxxxxxxxxxxx 西安工程大學(xué)畢業(yè)設(shè)計(jì)英文譯文 1 Automobile antilock braking system(ABS) Abstract This article introduced briefly the automobile antilock braking system(Antilock Braking System,is called ABS)the control principle,the control technology which used in the present automobile antilock braking system has carried on the summaym and has carried on the forecast to its trend of development. Key word:Automobile antilock braking system control technology Along with automobile industry39。s increase,the wheel rolling ingredient are getting fewer and fewer,but skids the ingredient to be getting more and more,generally expains in the brake process with glide rate S to skid ingredient how glide rate is bigger,the glide ingredient are less. And:uwheel center speed。s essential question is wheel39。s size relations,determines wheel39。s pressure four channel braking system,a vehicle rim has a solenoid valve。s sending attite to go against in the tooth the wheel totates,causes the sensor to produce the voltage siglae unceasingly,and input the puter,the ideal speed pares with RoM,figures out wheel39。s eηor to adjust can therefore overe to a certain extent as a result of the forecast model eηor and certain 西安工程大學(xué)畢業(yè)設(shè)計(jì)英文譯文 7 uncertainty disturbance and so on influence enables system39。 關(guān)鍵詞 : 汽車;防抱死制動系統(tǒng);控制技術(shù) 1 概述 隨著汽車工業(yè)的迅猛發(fā)展和高速公路的不斷修建,汽車的行駛安全性越來越為人們重視。 清楚防抱死制動系統(tǒng)是指汽車在制動過程中 能實(shí)時判定車輪的滑移率,自動調(diào)節(jié)作用在車輪上的制動力矩,防止車輪抱死。根據(jù)控制理論吧滑移率小語 SK 的區(qū)域稱為穩(wěn)定最大區(qū), SK 以后的為非穩(wěn)定穩(wěn)定去。 控制 定義期望滑移率 S0 與實(shí)際滑移率 S 之差為控制誤差 e=SS0,則 PID 的控制規(guī)律可表示為: 因此, ABS 控制器的設(shè)計(jì)最后就歸結(jié)為,根據(jù) ABS 動態(tài)系統(tǒng),確定出一組最佳的參數(shù) Kp、 Ki 和 Kd,使車輪的滑移率以最快 的方式逼近設(shè)定目標(biāo) S0。通常采用帶兩個 α值的修正因子表達(dá)就可滿足 性能要求,即: u =α X E + (1α )EC 其中,修正因子 α α2 屬于( 0,1)且 α1 小于 α2,控制系統(tǒng)在判斷 E 值得大小之后,選擇控制規(guī)則表達(dá)式。 這種曳速傳 感器常用多普勒測速雷達(dá)。為避免水、泥、灰塵對傳感器的影響,安裝前應(yīng)將傳感器加注黃油。支架就保持 在中間狀態(tài),三個孔間相互密封,保持制動壓力。當(dāng)車輪轉(zhuǎn)動時,使傳感器不斷產(chǎn)生電壓信號,并輸入電腦,與 RoM 中理想速度比較,算出車輪的增速或減速,向電磁閥發(fā)出升壓或 卸壓的指令,以控制制動分缸制動力。由于不同路況下各種門限值及保壓時間都是經(jīng)過反復(fù)試驗(yàn)得出的經(jīng)驗(yàn)數(shù)值,沒有十分明確的理論依據(jù),故 ABS 開發(fā)的周期長,且控制品質(zhì)難以保證。其中非接觸式的車速傳感器 (如光電式、多譜勒儀等 )今后最有可能應(yīng)用于汽車 ABS 系統(tǒng)中。目前 ABS 的控制技術(shù)主要采用邏輯門限值控制方法, 但隨著車速傳感器技術(shù)的發(fā)展,基于車輪滑動率的各種控制算法將被廣泛的重視和采用。未來汽車電子控制技術(shù)與裝置將以網(wǎng)絡(luò)的方式實(shí)現(xiàn)資源共享和綜合控制,并朝著多目標(biāo)綜合控制,以提高系統(tǒng)性能成本比的方向發(fā)展。其中模糊控制將以其不依賴對象的數(shù)學(xué)模型,便于利用人的經(jīng)驗(yàn)知識, 魯棒 39。 (1) 針對當(dāng)前廣泛采用的邏輯門限值控制算法所存在的缺點(diǎn),研究能跟蹤路面特性變化,使 ABS 各項(xiàng)性能指標(biāo)始終處于最佳狀態(tài)的控制 算法。 2) 裝有 ABS 的汽車,每年應(yīng)更換一次制動液。壓力一旦降低,電磁閥就轉(zhuǎn)換到壓力保持狀態(tài),或升壓的準(zhǔn)備狀態(tài)。對于四通道制動系統(tǒng),一個車輪圈有一個電磁閥 。而輪速傳感器裝在變速器外殼,由變速器輸出軸驅(qū)動, 它是一個脈沖電機(jī),所產(chǎn)生的頻率與輪速成正比。常作為 ABS 控制參數(shù)的有:車輪滑移率 S,車輪轉(zhuǎn)動的角加(減)速度 ω及其變化率。 通常去制動力矩為控制變量 U,切換條件為: 其中 Mb— 、 Mb+分別代表由調(diào)節(jié)系統(tǒng)所決定的制動力矩減少、增加兩種不同的狀態(tài)。 西安工程大學(xué)畢業(yè)設(shè)計(jì)英文譯文 9 目前所采用的 ABS 主要有輪速傳感器,電子控制單元,壓力控制閥和線束、管路等附件組成。它能把車輪的滑移率控制在一定的范圍之內(nèi),充分地利用輪胎與路面之間的附著力,有效地縮短制動距離,顯著地提高車輛制動時的可操縱性和穩(wěn)定性,從而避免了車輪抱死時易出現(xiàn)的各種交通事故。清楚防抱死制動系統(tǒng)(簡稱 ABS)已越來越多地應(yīng)用在 汽車上。s appearance in the ABS system will increase the vehicle speed sensor to bee possible the defmite wheel slip rate will bee is accurate and is fast. And the noncontact type39。 air,in order to avoid influence braking system39。s brake divides in cylinder39。 s glide tate