供應(yīng)力士樂電磁比例閥￥BOSCH比例閥 力士樂比例閥工作原理 電液比例控制裝置的核心元件電液比例閥具有結(jié)構(gòu)簡單、控制精度高、安裝使用靈活以及抗污染能力強(qiáng)等多方面優(yōu)點(diǎn).目前在車輛上取得廣泛應(yīng)用的是比例壓力閥，如在電子控制式自動變速器（ECT），電子式輔助液壓轉(zhuǎn)向系統(tǒng)（EPS）及制動防抱死系（ABs）等總成中都有一個或幾個比例壓力閥來實(shí)現(xiàn)對壓力平滑精確地控制.下面以一個典型的ECT的比例溢流閥為例分析比例壓力閥的工作原理.根據(jù)閥口流量公式、閥芯受力平衡公式及流量連續(xù)公式可以建立該溢流閥的動態(tài)數(shù)學(xué)模型，設(shè)該溢流閥接恒流源，即q，設(shè)為定值（25U而n），給定電流的變化函數(shù);利用InaUab編寫M函數(shù)對該模型進(jìn)行數(shù)值仿真，可以得到壓力凡隨電流1變化的關(guān)系，如圖2所示.利用求得的這些數(shù)值解進(jìn)行zui小二乘曲線擬合，可以得到壓力凡隨電流1變化的函數(shù)凡二f（i）. 傳統(tǒng)驅(qū)動與控制技術(shù) 比例閥驅(qū)動與控制系統(tǒng)對控制信號進(jìn)行處理和放大，驅(qū)動銜鐵輸出推力，因此，該系統(tǒng)的優(yōu)劣直接關(guān)系到整個液壓系統(tǒng)的性能.大多數(shù)比例閥的生產(chǎn)廠家提供與其產(chǎn)品配套的功率放大器，這種的功率放大器的原理圖如圖3所示.該電路由顫振信號發(fā)生電路、控制信號疊加電路及U/I轉(zhuǎn)換電路三部分組成.顫振電路是為了減小磁滯及庫侖摩擦引起的死區(qū)和滯環(huán)，提高比例閥對電流響應(yīng)的靈敏度，顫振信號的頻率為質(zhì)量一彈簧系統(tǒng)無阻尼自然頻率的2倍，一般為20一30HZ，常用的顫振信號為正弦波或三角波，振幅約為額定控制信號的10%一20%.控制信號電壓與顫振信號電壓通過反相加法運(yùn)算電路進(jìn)行疊加，為滿足相位的要求，其后又增加一級反相器.zui后的U/I轉(zhuǎn)換電路將輸人的電壓信號轉(zhuǎn)換為比例閥線圈的控制電流輸出. 該功率放大器的功放三極管工作于線性放大區(qū)，其集電結(jié)發(fā)熱量較大，并且電阻Rll與比例閥線圈通過的電流幾乎相同，所以Rll的功率高達(dá)10w，因此三極管和電阻Rll容易燒壞，而兩個器件過高的溫度對其旁邊的運(yùn)算放大器的工作也有影響.另外，由于計(jì)算機(jī)無法與比例電磁鐵直接接口，要產(chǎn)生具有一定精度的控制信號，必須要使用D/A轉(zhuǎn)換器.   4WE6D7X/HG24N9K4 4we6d62/ofeg24n9k4 4WE6C7X/HG24N9K4 4WE6E7X/HG24N9K4 4WE6J7X/HG24N9K4 4WE6M7X/HG24N9K4 4WE6Y7X/HG24N9K4 4WE6D6X/EG24N9K4 4WE6C6X/EG24N9K4 4WE6E6X/EG24N9K4 4WE6J6X/EG24N9K4 4WE6Y6X/EG24N9K4 4E6G6X/EG24N9K4 4WE6H6X/EG24N9K4 4WE6D/OFEG24N9K4 4WE6EA6X/EG24N9K4 4WE6EB6X/EG24N9K4 4WE6U6X/EG24N9K4 4WE6R73-6X/EG24N9K4/A12 3WE6A6X/EG24N9K4 4WE10Y3X/CG24N9K4 4E10D3X/CG24N9K4 4WE10EA3X/CG24N9K4 4WE10EB3X/CG24N9K4 4WE10E3X/CG24N9K4 4E10J3X/CG24N9K4 4WE10U3X/CG24N9K4 4WE10G3X/CG24N9K4 4WE10F3X/CG24N9K4 4WE10M3X/CG24N9K4 4WE6D6X/EW230N9K4 4WE6E6X/EW230N9K4 4WE6J6X/EW230N9K4 4WE10D3X/CW230N9K4 4WE10E3X/CW230N9K4 4WE10J3X/CW230N9K4 4WE6Y62/EG24N9K4/B10 4WE6E-6X/EG24N9K4/V 4WE10E-3X/CG24N9K4/V 4WE6E-6X/EG24N9K4/V 4WE6E-6X/EG24K4/V 4WE10D3X/CG24N9K4/V 4WE6J6X/EG24N9K4/V 4WE6E6X/EG24N9K4/V 4WE6J-6X/EG24N9K4+Z5L 4WE6J-6X/EG24N9K4+Z5L 4WE6J-6X/CG24N9Z5L 4WE6J-5X/EW110NZ5L/V 4WE6D-6X/G24N9K4B10 4WE6D-6X/EG24N9K4/B08 4WE10Y-3X/CG24N9K4 4WE10J-4X/CG24N9K4 4WE10J-3X/CW110N9K4/V 4WE10J-3X/CG24N9K4/V 4WE10J-3X/CG24N9K4 4WE10E-3X/CG24N9K4/V 4WE10E-3X/CG24N9K4 4WE10D-3X/CG24N9K4+Z4 4WE10D-3X/CG24N9K4 4WE6Y50B/BG24NZ4 4WE6Y50B/BG24NZ5L 4WE6Y50B/BW220RNZ5L 4WE6Y50B/AG24NZ4B10/V 4WE6Y-61B/CG24N9Z5L/V 4WE6Y50B/AG110NZ4 4WE6Y-61B/CG220N9Z4 4WE6Y-61B/OFCG24N9Z4 4WE6Y50B/OFAG24NZ5L 4WE6Y-61B/OFCG24N9Z5L 4WE6Y-61B/CW110RN9Z5L 4WE6Y50B/AG220NZ4 4WE6Y50B/OFAW220RNZ5L 4WE6Y-61B/CG24N9Z4/V 4WE6Y-61B/CG220N9Z5LB12 4WE6Y-61B/CG24N9Z4B10/V 4WE6Y-61B/CW220RN9Z5L 4WE6Y50B/OFAG24NZ4 4WE6Y2-61B/CG24N9K4V HD-4WE6Y60/SG24N9Z4 4WE6Y50B/BG12NZ4 3WE6A50B/OAG24NZ4 3WE6A50B/OAG110NZ5L 3WE6A50B/OAW220-50NZ4 3WE6A50B/OAW220-50NZ5L 3WE6A50B/OFAG24NZ4 3WE6A50B/OFAG24NZ5L 3WE6A50B/OFAW220-50NZ4 3WE6A50B/AG12NZ4 3WE6A50B/AG24NZ4 3WE6A50B/AG24NZ4B12 3WE6A50B/AG24NZ5L 3WE6A50B/AW220RNZ5L 3WE6A50B/AW220-50NZ4 3WE6A50B/AW220-50NZ5L 3WE6A50B/AW110-50NZ5L 3WE6A50B/AG24NZ5LB08 3WE6A50B/AW110RNZ5L 3WE6A50B/OAG24NZ5L 3WE6A50B/AW110-50NZ4 3WE6A50B/AW220-50NZ4B12 3WE6A50B/AG12NZ5L 3WE6A50B/ 3WE6A-61B/CG24N9Z4 3WE6A-61B/CG24N9Z5L 3WE6A-61B/OFCG24N9Z5L 3WE6A-61B/CW220-50N9Z4 3WE6A-61B/CW220-50N9Z4B08 3WE6A-61B/CW220-50N9Z4B12 3WE6A-61B/CG24N9Z5LB10 3WE6A50B/OAW220RNZ5L 3WE6A50B/OAW110RNZ5L 3WE6A-61B/CG24N9Z4B10 3WE6A-61B/CW220-50N9Z5L 3WE6A-61B/CW220-50N9Z5LB12 3WE6A-61B/CG12N9Z5L |
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