QUINT-PS-100-240AC/24DC/20
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1 引言
目前,我國生產(chǎn)的中高檔轎車的發(fā)動機雖然基本上都采用了燃油電噴技術(shù),并對電噴系統(tǒng)的元器件已基本具備了配套研發(fā)能力和生產(chǎn)能力,但卻沒有電噴發(fā)動機自主知識產(chǎn)權(quán),均屬于引進國外電噴發(fā)動機生產(chǎn)線或電噴系統(tǒng)。特別是作為核心部件的ECU(電控單元)卻被外商掌握,ECU中的噴油和點火MAP、控制算法和程序是*保密的。同時,進口國別多、品種規(guī)格雜,一些企業(yè)缺乏選擇論證,引進的技術(shù)水平和產(chǎn)品質(zhì)量參差不齊,不少缺乏充分的匹配實驗。
本研究項目正是一個將人、車與環(huán)境作為綜合系統(tǒng),對各種因素進行綜合協(xié)調(diào),使汽車的控制性能趨于*的ECU。因此,具有較高的經(jīng)濟效益與社會效益,將促進工業(yè)控制網(wǎng)絡(luò)及嵌入式控制系統(tǒng)在汽車工業(yè)的應用,使汽車更加智能化、人性化。
2 研究內(nèi)容 QUINT-PS-100-240AC/24DC/20
本項目研究的主要控制對象是燃油噴射和點火裝置。同時還具有一些相關(guān)的輔助控制功能。主要包括:
(1)智能燃油噴射控制II C(Inligent Injection Control),主要包括噴油量、噴射定時、燃油停供及油泵的控制。由于采用了智能設(shè)計,解決固定控制算法的不足,可有效的節(jié)約燃油,有助于整體性能的提高。
(2)進氣控制,主要包括動力閥和渦流閥控制,可有效改善和提高發(fā)動機的輸出扭矩和動力。
(3)增壓控制,ECU根據(jù)進氣壓力傳感器檢測的進氣壓力信號去控制釋壓電磁閥,以控制排氣通路切換閥,改變排氣通路的走向,從而控制廢氣渦輪增壓器進入工作或停止狀態(tài)。
(4)電子點火控制ESI(Electrical Spark Ignite),點火裝置的控制主要包括點火提前角控制、通電時間(閉合角)與恒流控制、爆震控制等方面。
(5)怠速控制ISC(Idle Speed Control),發(fā)動機在汽車運轉(zhuǎn)、空調(diào)壓縮機工作、變速器掛入檔位、發(fā)電機負荷加大等不同怠速運轉(zhuǎn)工況下,由ECU控制怠速控制閥,使發(fā)動機都能處在怠速轉(zhuǎn)速下運轉(zhuǎn)。
(6)排放控制,控制項目主要有:排氣再循環(huán)控制EGR(Exhaust Gas Recirculation Control)、氧傳感器及三元催化開環(huán)和閉環(huán)控制、二次空氣噴射控制、活性炭罐電磁閥控制等。
(7)警告與提示,ECU控制各種提示和警告裝置,顯示有關(guān)控制系統(tǒng)的工作狀況,若控制系統(tǒng)出現(xiàn)故障時發(fā)出警告信號。
(8)傳感器故障預診參考系統(tǒng)(失效保護),當主ECU檢測到傳感器或線路故障時,即會按主ECU預先程序提供的設(shè)定值,以便發(fā)動機仍能保持運轉(zhuǎn),但性能將有所下降。
(9)主ECU故障備用冗余系統(tǒng),當主ECU發(fā)生故障時,則會自動啟動備用冗余系統(tǒng),使發(fā)動機轉(zhuǎn)入強制運轉(zhuǎn)狀態(tài),以便駕駛員將其開去修理。
3 電噴系統(tǒng)的組成
電噴系統(tǒng)除了一般化油器發(fā)動機都有的電源、沖電裝置、點火裝置及起動裝置外,還有電子燃料噴射控制裝置、怠速控制裝置、電控單元ECU及各種信號采集裝置(傳感器)。圖3-1所示就是一種電噴射系統(tǒng)的組成
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