外文翻譯--汽車交流底盤測功機(jī)測試系統(tǒng)研究

附 錄 附錄 A 外文資料翻譯 Study on the testing system of the auto AC chassis Dynamometer With the incessant progress of the science and technology, the automobileindustry of developes rapidly. The structure of automobile becomes perfect and the performance gets enhanced. On the one hand, the higher demand of automobile performance accelerates the coalescent between traditional automobile technique and modern electron technology,and the automobile technical indexes have been enhanced greatly.On the other hand it accelerates the development of integrated automobile detection technique, and speeds up the research and renovation of the automobile testing equipments. There are two methods for automobile performance test. One is the outdoor road test, the other one is the indoor frame test. The weather,condition of the road and the driving skills have great influence on the road test. However these factors have little influence on the results of indoor frame test. So the indoor frame test gets popular in the automobile test. Automobile chassis dynamometer plays an important role in the automobile detection and diagnosis. Dynamic performance test can been done on the auto chassis dynamometer test bed. With the help of fuel consumption instrument and automotive flue exhaust analyzer, fuel economy test and the analysis of exhaust gas can been done easily. The domestic auto chassis dynamometers get behind that of the developed country. The domestic chassis dynamometers are mainly eddy current dynamometer and hydraulic dynamometer. Generally these dynamometers are equipped with flywheels to simulate the accelerate resistance.By control of the electromagnetic clutch,assemble the required flywheels according to the weight of the car.But the limited flywheels cant realize the continuous simulation of the inertia.They cant satisfy the testing demand of the various cars nowadays.And the test precision needs being improved. Thus this thesis puts forward a new method with the help of an AC electric dynamometer.The principle of AC electric dynamometer is similar as the asynchronous electromotor.With the rapid development of frequency converter,the AC electric dynamometer becomes more popular and easy to be controlled.The paper includes these main points as follows. 1. Simply introduce the principle and structure of the automobile chassis dynamometer.Adopts the anti-swing device for the driving wheel, and solves the swing of front-wheel drive cars. In order to recur the road resistance of the automobile,analyse the resistances of the car driving on the road and on the chassis dynamometer,draw a resistance equation separately about the car.Then make contrast of the two equations,find their difference and put forward the electric simulation model.It provides the theoretic basis for the next electric simulation on the AC electric dynamometer. roadF 2CuBuA + mgsin + dtdum The model displays as follows. 2. Give the general technical demands.Analyse the principle of AC electric dynamometer.It has three running conditions according the difference of the slip.They are regeneration condition,electric drive condition and electromagnetic brake condition.For this reason the AC electric dynamometer is 2 proper to be used in chassis dynamometer and can satisfy the demand.Use the advanced AC variable frequency technique to control the dynamometer.This system adopts the direct torque control of frequency converter.By the control of frequency converter the system can realize the auto speed regulate,auto torque regulate and auto load regulate. 3. After choosing the proper sensors for the system, design the part of data collection and analysis,and analyse the amplification of analog signals in detail.In order to do the electric simulation the speed and acceleration are necessary.The system uses an improved method to measure the speed, and uses least square method to get the acceleration.It has excellent precision at low speed and high speed.Analyse the interferential factors,and adopt proper measures to restrain the disturb and assure the veracity of the results. 4. The testing system is based on Windows XP and program with VC+6.0. The testing system can operate alone and can operate online. The software of the system adopts blocking design according to the system design demand.That is to say,if any one logic part of the software was changed,it wouldnt affect other parts.And any module can be transferred by other modules.The testing interface is friendly.Take the acceleration test and sliding performance test for example, introduce their testing process. At last give the flow of the whole program. 5. Analyse the reason of the error, demarcate the speed sensor and force sensor to see the quality of the linearity of the sensors.The results show the two sensors have good linearity and satisfy GB/T18276-2000 Test method and evaluation index for the automobile dynamic frame benches.Use a truck do the acceleration test from 30km/h to 90km/h on the road and on the chassis dynamometer separately,then make contrast of the results and show that the electric simulation model is correct basically. The automobile chassis dynamometer itself is very complicated.The thesis cant describe every aspect in detail.And it is hard to avoid some mistakes and disadvantages.The testing system needs to been further researched and improved,and needs doing more experiments to validate its feasibility 3 汽車交流底盤測功機(jī)測試系統(tǒng)研究 隨著科學(xué)技術(shù)的不斷進(jìn)步，汽車工業(yè)得到了迅猛的發(fā)展。汽車結(jié)構(gòu)不斷完善，汽車性能不斷提高。人們對汽車性能要求的不斷提高，一方面促進(jìn)了傳統(tǒng)的汽車技術(shù)與現(xiàn)代電子技術(shù)的結(jié)合，使汽車的經(jīng)濟(jì)技術(shù)指標(biāo)在最 近幾十年有了大幅度的提高；另一方面，它促進(jìn)汽車綜合性能現(xiàn)代檢測技術(shù)的發(fā)展和廣泛應(yīng)用，大大提高了汽車新產(chǎn)品的開發(fā)速度和出廠產(chǎn)品質(zhì)量的控制能力。 汽車性能測試分為室外道路試驗(yàn)測試和室內(nèi)臺(tái)架測試，由于道路試驗(yàn)受氣候、道路條件狀況及駕駛技術(shù)等因素的影響比較大，汽車檢測以室內(nèi)臺(tái)架測試為主。汽車底盤測功機(jī)是一項(xiàng)重要的汽車檢測設(shè)備，在汽車檢測行業(yè)扮演著十分重要的角色。利用底盤測功機(jī)，我們不僅可以對汽車進(jìn)行動(dòng)力性能檢測，在配備油耗儀和尾氣分析儀的基礎(chǔ)上，我們還可以在不同工況下對汽車的燃油經(jīng)濟(jì)性和尾氣排放進(jìn)行測試分析。目前的 底盤測功機(jī)主要以電渦流測功機(jī)和水力測功機(jī)為主，通常配備一些慣性飛輪來對汽車的慣性阻力進(jìn)行相應(yīng)模擬。通過控制電磁離合器的吸合與斷開來控制不同飛輪的組合，以實(shí)現(xiàn)對不同質(zhì)量汽車運(yùn)動(dòng)慣量的模擬。但有限數(shù)量的飛輪，不能實(shí)現(xiàn)汽車慣量的無級(jí)模擬，不能滿足當(dāng)前各種類型汽車的檢測需求，而且模擬精度有待提高。 由此本文提出了采用交流測功機(jī)模擬汽車行駛阻力。這樣不僅省去了繁瑣的慣性飛輪，簡化了機(jī)械結(jié)構(gòu)，而且可實(shí)現(xiàn)慣量的無級(jí)模擬。本文從總體上進(jìn)行系統(tǒng)設(shè)計(jì)與分析，主要包括以下幾點(diǎn)。 1對汽車底盤測功機(jī)的原理和結(jié)構(gòu)進(jìn)行簡單介紹，采用 課題組自行開發(fā)的汽車車輪防偏擺機(jī)構(gòu)，有效解決了前輪驅(qū)動(dòng)型汽車在測功機(jī)上運(yùn)行時(shí)的橫擺問題，并保證了測試時(shí)的安全性。為了在底盤測功機(jī)上真實(shí)再現(xiàn)汽車道路行駛工況，需要真實(shí)反映汽車的道路行駛阻力。文章分別對汽車在道路上和底盤測功機(jī)上的運(yùn)行狀況進(jìn)行了力學(xué)分析，建立了交流測功機(jī)電模擬的數(shù)學(xué)模型。 roadF 2CuBuA + mgsin + dtdum 該數(shù)學(xué)模型為進(jìn)一步交流 測功機(jī)的電模擬提供了理論依據(jù)。 2 對系統(tǒng)提出總體技術(shù)要求，分析交流測功機(jī)的工作原理，在轉(zhuǎn)差率不同的情況下，交流測功機(jī)分別運(yùn)行于發(fā)電測功狀態(tài)，拖動(dòng)狀態(tài)以及電磁制動(dòng)狀態(tài)。由于交流測功機(jī)既可以運(yùn)行于發(fā)電測功狀態(tài)，又可以運(yùn)行于拖動(dòng)狀態(tài)，適合用于底盤測功機(jī)中。利用目前先進(jìn)的變頻調(diào)速技術(shù)來控