【正文】 未來汽車電子控制系統(tǒng)將朝著從多電子控制單元CECU) 的分散的獨(dú)立控制向單 ECU 的整車控制，以網(wǎng)絡(luò)的方式實(shí)現(xiàn)數(shù)據(jù)共享和綜合控制的方向發(fā)展。4 發(fā)展趨勢(shì)采用邏輯門限值控制算法，可避免一系列繁雜的理論分析和對(duì)一些不確定因素的定量計(jì)量。工作原理如下:1) 升壓在電磁閥不工作時(shí)，制動(dòng)主缸接口和各制動(dòng)分缸接口直通。其中滑動(dòng)率是從各輪速信號(hào)按一定邏輯確定汽車的參考速度后，計(jì)算出的參考滑動(dòng)率，與實(shí)際滑動(dòng)率存在著差異。目前所采用的主要是邏輯門限控制技術(shù)。ABS是常規(guī)剎車裝置基礎(chǔ)上的改進(jìn)型技術(shù)，可分為機(jī)械式和電子式兩種。s angular speed is advantageous realizes therefore the load cost is low. This algor hm already drew close maturely for current automobile ABS system universal usebut it by no means best control algorithm. Because under the different state of roads each kind of threshold value and guarantees presses the time is the empirical value which obtains after the repeated test does not have the very explicit theory basistherefore the ABS development39。s braking force again through the solenoid kind tows the fast sensor monly used Doppler velocity the automobile goes the Doppler radar antenna by certain frequency to the earth launching electromagnetic wave,simultaneously receives the electromagnetic wave which unceasingly reflects,surveys the automobile radar lanch and the receive differential value,then may calculate the automobile vehicle speed turns the fast sensor to install in the transmission gearbox outer covering,acuates by the transmission gearbox output shaft,it is a pulse electrical machinery,procuces frequency and round intensive direct impiementing agency and so on is posed of the solenoid valve and the valve adjustment braking forve,with the aim of maintaining the ideal slipping kind of ABS may guarantee that the slipping rate ideal control,against holds the braking quality to be good,but because increased a velocity radar,there the structure is plex,the cost is also high. Single parameter controlIt take controls wheel39。s level.2. Conrtol technology used by ABS nowThe ABS control effect is decided control technology[4]which to a great extent uses in the present uses is mainly the logical threshold value control further enhance ABS the performance,but also proposed some based on the glide tate control technology,like the PID control,the glide modality change the srtucture controls,fuzzycontrol and so kind of control approaches the expectation by the different control rule the spot. PID controlsThe definition expects glide rate S0 and difference of the actual glide rate S for e=SS0,then the PID control rule may be represented as:Therefore,the ABS controller39。 unceasing construction,automobile39。 way handoff control quantity39。s brake divides in cylinder39。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。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(dòng)距離，顯著地提高車輛制動(dòng)時(shí)的可操縱性和穩(wěn)定性，從而避免了車輪抱死時(shí)易出現(xiàn)的各種交通事故。通常去制動(dòng)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(dòng)力矩減少、增加兩種不同的狀態(tài)。而輪速傳感器裝在變速器外殼，由變速器輸出軸驅(qū)動(dòng)， 它是一個(gè)脈沖電機(jī)，所產(chǎn)生的頻率與輪速成正比。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)。(1) 針對(duì)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。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。當(dāng)車輪轉(zhuǎn)動(dòng)時(shí)，使傳感器不斷產(chǎn)生電壓信號(hào)，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(dòng)分缸制動(dòng)力。為避免水、泥、灰塵對(duì)傳感器的影響，安裝前應(yīng)將傳感器加注黃油。通常采用帶兩個(gè)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αα2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。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。關(guān)鍵詞：汽車；防抱死制動(dòng)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。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 size relations,determines wheel39。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 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。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 )ECAnd,modification factor α1,α2 in (0,1). Logical threshold value controlThis 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 v