Research Article AnLQGControllerBasedonRealSystemIdentificationforan ActiveHydraulicallyInterconnectedSuspension YaohuaGuo , 1 BinWang , 2 AntonTkachev , 3 andNongZhang 2,3 1 Research Center of Zhengzhou Yutong Bus Co., Ltd., Zhengzhou, Henan, China 2 School of Automotive and Transportation Engineering, Hefei University of Technology, Hefei, China 3 School of Mechanical and Mechatronic Engineering, University of Technology, Sydney, Australia CorrespondenceshouldbeaddressedtoBinWang;18987669833@163.com Received 7 October 2020; Revised 4 November 2020; Accepted 11 November 2020; Published 24 November 2020 AcademicEditor:XinglingShao Copyright©2020YaohuaGuoetal.isisanopenaccessarticledistributedundertheCreativeCommonsAttributionLicense, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Rolloverpreventionisalwaysoneoftheresearchhotspotsinvehicledesign.Activehydraulicallyinterconnectedsuspension(HIS) is a promising technology to reduce vehicle body roll angle caused by different driving inputs and road conditions. is paper proposesanovelactuatoroftheactiveHISsystem.eactuatorconsistsoftwocylinders,aballscrew,andonlyonemotor.e actuator proposed can reduce the number of motors needed in the system. Meanwhile, forced vibration identification (FVI) is usedtoidentifythetransferfunctionofahalf-carphysicalmodelandaKalmanstateobserverisappliedtoeliminatetheinfluence ofsensornoise.eFVImethodcaneliminatemostmodeluncertaintiesandhiddenvariables.Aggressiveandmoderateoptimal linear quadratic Gaussian (LQG) methods are implemented to control the motion of the vehicle body based on the identified transferfunctionofthephysicalmodel.eperformanceofanactiveHISsystemwithanaggressiveandmoderateLQGcontroller iscomparedwiththatofapassiveHISsystem.eeffectivenessoftheLQGcontrollerisvalidatedbysimulationandexperimental results.Also,theobtainedresultsshowthatthestabilizationspeedoftheactiveHISsystemis20%fasterthanthatofthepassive HIS system and the roll angle can be reduced up to 55% than that of the passive HIS system. 1.Introduction Recently,withtheincreaseinthespeedofvehiclesonroaddue to improved driving conditions, the number of rollover ac- cidents is rising. erefore, anti-roll performance receives increasingattentioninthevehicledesignprocess.Amongthe measures to reduce roll angles such as active steering, dif- ferential braking, and active suspension, the application of active steering and differential braking will interfere with normal driving operation. Hence, it will be more worthy to investigatethebenefitsbroughtbyapplyingactivesuspensions for preventing vehicle rollover accidents from happening [1]. evehiclesuspensionsystemisasystemthatconnects wheels and the vehicle body. A suspension system mainly servestwopurposes.efirstpurposeistoisolatetheshock and vibration generated by the road excitation to protect occupants from ride discomfort. e second purpose is to keepthewheelsincontactwiththeroadsurfacetoimprove the stability and safety of the vehicle [2]. Generally, vehicle suspensions can be classified into three types according to energy consumption and control force, i.e., passive, semi- active,andactivesuspensions[3,4].epassivesuspension generally consists of shock absorbers and springs. Param- etersofpassivesuspensionsaregenerallyfixedandcannotbe adjusted after manufacture. Conflicts are existing between ride comfort and handling performance on passive sus- pensions[5,6].esemiactivesuspensionisimprovedfrom passive suspension, but the external energy input into the suspension system is insufficient to stabilize the motion of the vehicle body. e active suspension is a kind of sus- pension which can provide sufficient energy to stabilize the motionofthevehiclebody[7].Comparedwithpassiveand semiactivesuspension,theactivesuspensionusuallyrealizes its function by four independently acting force actuators. e purpose of the actuators is to produce or dissipate energy under different road excitations. Hindawi Mathematical Problems in Engineering Volume 2020, Article ID 6669283, 10 pages https://doi.org/10.1155/2020/6669283