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1、EPS與ASS整車系統(tǒng)的H。/PID集成控制研究摘要本文建立了EPS動力學(xué)模型和ASS整車動力學(xué)系統(tǒng)模型,分析兩個系統(tǒng)之間的相互影響,建立了EPS和ASS的集成模型,綜合考慮路面干擾與轉(zhuǎn)向行為對車身姿態(tài)的影響、EPS對操縱穩(wěn)定性的影響及其省力作用,研究EPS與ASS的集成控制問題。首先,對電動助力轉(zhuǎn)向和汽車本身進行轉(zhuǎn)向動力學(xué)分析,建立EPS的數(shù)學(xué)模型及整車的轉(zhuǎn)向模型,并建立EPS和ASS的集成模型;其次,在集成模型的基礎(chǔ)上,考慮人體對水平和垂直方向振動的敏感性,選擇合適的H。頻域加權(quán)函數(shù),應(yīng)用H??刂评碚摵蚉ID控制理論設(shè)計集成控制器;最后,為了
2、說明集成控制是否優(yōu)于單個控制,對EPS和ASS系統(tǒng)分別設(shè)計了PID控制器和H??刂破鳎謩e應(yīng)用于電動助力轉(zhuǎn)向、被動懸架集成系統(tǒng)和無助力轉(zhuǎn)向、主動懸架集成系統(tǒng)。本文應(yīng)用MATLAB6.5/SIMULINK仿真軟件對上述模型及三種控制策略進行仿真。仿真結(jié)果表明,在行駛平順性和操縱穩(wěn)定性方面,采用集成控制比只有主動懸架的系統(tǒng)要好,二者都優(yōu)于只采用電動助力轉(zhuǎn)向的系統(tǒng)。這說明,該集成控制能夠綜合提高整車轉(zhuǎn)向的性能,從而為汽車的集成控制的研究提供有價值的參考。研究開發(fā)了基于MCS.51單片機的控制電路和ECU,以及EPS與整車系統(tǒng)的PC機信號采集系統(tǒng),對EP
3、S系統(tǒng)進行臺架試驗,在改裝后的裝有EPS和有級可調(diào)阻尼器的昌河CH6353微型面包車上進行了道路試驗。試驗結(jié)果表明,對電動助力轉(zhuǎn)向和半主動迸行集成控制是可行有效的。關(guān)鍵詞:電動助力轉(zhuǎn)向主動懸架整車動力學(xué)模型H。最優(yōu)控制集成控制整車試驗ResearchonIntegratedH。/PIDControlofVehicleElectricalPowerSteeringandActiveSuspensionSystemABSTRACTInthispaper,anintegratedfullmodelofEPSandASSwasbuilt,consider
4、ingtheroadinputs’influencetoEPSandsteering’tosuspension,integratedcontrolmethodforEPSandASSbasedonH。optimalcontrolstrategyandPIDtheoryhasbeenstudiedgiventhecomplexityofthemutualdisturbancebetweensteeringandsuspension.Firstly,anintegratedmodelforthevehiclewithEPSinsteadofHPS(h
5、ydraulicpowersteering)whenitsteerswasbuiltbasedonsteeringmodelandthefullvehicledynamicmodel.Secondly,consideringthestabilityofrunning,hequency-dependentweightingmatricestoreducethespecificvariablesrelatedtothevibrationatspecificbandsofffequencywereintroducedandanoptimalintegr
6、atedcontrollerforEPSandASSwasdesigned.Finally,inordertoanalyzetheeffectsofthecontroller,controllersforEPSandthefullvehicledynamicsystemhavebeendesignedandapplied,andtheeffectswerecomparedusingsimulationtools.Theresultsofthesimulationshowthat,comparedtothepartlycontrolsystem,t
7、heintegratedcontrolforEPSandASSnotonlycansavelaborbutalsocaneffectivelysuppressthevibrationofvehicleintherangeoffrequenciessensitiveofhumanbody,greatlyimprovetheridecomfortandsteeringstability.Integratedcontrolisrealizableandeffective.Hence,itprovidessomevaluabletheoreticrefe
8、rencefortheresearchofvehicleactivesuspensioncontr01.Newintegratedcon