Improving off-road vehicle handling using an active anti-roll bar

Cronje, Paul Hendrik; Schalk, P.

doi:10.1016/j.jterra.2009.09.003

Cited by 67 publications

(32 citation statements)

References 18 publications

(20 reference statements)

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“…It also has 16 moving parts, 6 spherical joints, 8 revolute joints, 7 Hooke's joints and a motion defined by the steering driver. The model was modified by [17], [18] and [19] to add additional changes made to the test vehicle. Schematic diagrams of the front and rear suspension layouts are indicated in Figure 3 and Figure 4.…”

Section: Vehicle Modelmentioning

confidence: 99%

Comparison of different gas models to calculate the spring force of a hydropneumatic suspension

Westhuizen

Schalk

2015

Journal of Terramechanics

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When developing any simulation model some compromise must be made between computational efficiency and the accuracy of the model. This study compares the performance of three ideal gas (IG) law variations (IG with the energy equation (EE), isothermal and adiabatic), and two real gas approaches (Benedict Webb Rubin (BWR) equation with and without the EE) to model the spring force of a hydropneumatic suspension. These models are compared with experimental data obtained from laboratory tests on a single hydropneumatic suspension unit. Both the BWR and IG models with the EE offer a significant improvement in correlation compared to the models without the EE. The real gas BWR approach offers a small improvement over the IG approach under the test conditions. The best (BWR with EE) and worst (IG isothermal) models are then used to model the spring forces in a full vehicle model of a 4x4 Sports Utility vehicle (SUV). The data is again compared with experimental results and the BWR model with the EE correlates significantly better than the IG isothermal model. It is thus concluded that the inclusion of the EE will yield significantly better results and it should only be omitted if the parameters investigated are not sensitive to errors in the spring model.

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Section: Vehicle Modelmentioning

confidence: 99%

Comparison of different gas models to calculate the spring force of a hydropneumatic suspension

Westhuizen

Schalk

2015

Journal of Terramechanics

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“…Eksperimentele resultate bevestig dat "n beduidende verbetering in bakrol moontlik is. Tables Table 1 Lane change track dimensions (International Organisation for Standardisation, 1975) ......... 12 Table 2 Weighted RMS of vertical acceleration for test runs on a Belgian paving (Cronje, 2008) ..... 20 Table 3 Valve Force analysis of a vehicle (seen from the rear) during cornering (Gillespie, 1992) Constant Radius Test (Gillespie, 1992 Cornering of a bicycle model (Gillespie, 1992) …”

Section: Opsommingmentioning

confidence: 99%

Slow active suspension control for rollover prevention

Westhuizen

Schalk

2013

Journal of Terramechanics

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Slow active suspension control for rollover prevention AbstractRollover prevention in Sports Utility Vehicles (SUV"s) offers a great challenge in vehicle safety. By reducing the body roll angle of the vehicle the load transfer will increase and thus decrease the lateral force that can be generated by the tires. This decrease in the lateral force can cause the vehicle to slide rather than to roll over. This study presents the possibility of using slow active suspension control to reduce the body roll and thus reduce the rollover propensity of a vehicle fitted with a hydro-pneumatic suspension system. The slow active control is obtained by pumping oil into and draining oil out of each hydro-pneumatic suspension unit individually. A real gas model for the suspension units as well as for the accumulator that supplies the oil is incorporated in a validated full vehicle Adams model. This model is then used to simulate a double lane change manoeuvre performed by a SUV at 60 km/h and it is shown that a significant improvement in body roll can be obtained with relatively low energy requirements.The proposed control is successfully implemented on a Land Rover Defender test vehicle. A Proportional-Derivative (PD) controller is used to control on-off solenoid operated valves and the flow is adjusted using the lateral acceleration as a parameter. Experimental results confirm that a significant improvement in body roll is possible. OpsommingOmrolvoorkoming in Sportnutsvoertuie bied geweldige uitdagings in terme van voertuigveiligheid. Deur die rolhoek van die voertuig te verminder word die laterale lasoordrag verhoog en word die laterale krag wat die bande kan genereer minder. As die laterale krag genoeg verminder sal die voertuig eerder gly as omrol. Die studie ondersoek die moontlikheid om stadig-aktiewe suspensiebeheer op "n voertuig met "n hidropneumatiese suspensie te gebruik om bakrol te verminder en dus die omrolgeneigdheid van die voertuig te verlaag. Die beheer word toegepas deur olie in elke hidropneumaties suspensie-eenheid individueel in te pomp of te dreineer."n Werklike gas model word gebruik om die supensie-eenhede asook die akkumulator, wat die olie aan die suspensie voorsien, te modeleer. Hierdie modelle word in "n gevalideerde volvoertuig ADAMS model geïnkorporeer en "n dubbel laanverwisseling word gesimuleer teen 60 km/h. Die resultate toon dat "n beduidende verbetering in die rolhoek moontlik is met relatiewe lae energievereistes.Die voorgestelde beheer is suksesvol op "n Land Rover Defender geïmplimenteer en "n Proportioneele-Differensiaal (PD) beheerder word gebruik om die aan-af solenoїde kleppe te beheer terwyl die vloei aangepas word na gelang van die laterale versnelling. Eksperimentele resultate bevestig dat "n beduidende verbetering in bakrol moontlik is.Acknowledgements

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“…But the anti-roll bar has recently become very popular among researchers to tackle the issues of the trade-off between ride and handling [7][8][9]. Cronjé and Els studied the effect of the active anti-roll bar on ride comfort and handling of an off-road vehicle [10,11]. They also analysed the use of anactive anti-roll bar as a means of improving the handling of an off-road vehicle without sacrificing ride comfort [11].…”

Section: Introductionmentioning

confidence: 99%

“…Cronjé and Els studied the effect of the active anti-roll bar on ride comfort and handling of an off-road vehicle [10,11]. They also analysed the use of anactive anti-roll bar as a means of improving the handling of an off-road vehicle without sacrificing ride comfort [11]. In order to improve the vehicle performance in this area, a lot of control schemes have been proposed in the framework of a computercontrolled suspension system such as an active or semi-active suspension system [4,6].…”

Section: Introductionmentioning

confidence: 99%

Ride and Handling Analysis for an Active Anti-Roll Bar: Case Study on Composite Nonlinear Control Strategy

Zamzuri¹,

Mazlan²,

Zulkarnain

2014

Int. J. Automot. Mech. Eng.

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This paper presents a comparison of ride and handling analysis for an active anti-roll bar system using various types of controller. Work using conventional and modern control approaches has been investigated by previous researches. This study further extends this work by investigating a particular modern control technique using a linear quadratic regulator, linear quadratic Gaussian and composite nonlinear feedback controller in designing the closed loop feedback for an anti-roll bar system control scheme. A simple linear quadratic regulator and a linear quadratic Gaussian are first investigated. An active anti-roll bar system has to balance the trade-off between ride comfort and handling performance. The new linear quadratic Gaussian composite nonlinear feedback (LQG-CNF) fusion control strategy is developed to improve the performances on vehicle ride comfort and handling for an active anti-roll bar system. The linear half car model is combined with a single track model with roll dynamics. The performance of the controllers is compared and the simulation results show that the proposed control strategy gives better performance in terms of vehicle ride comfort and handling.

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Improving off-road vehicle handling using an active anti-roll bar

Cited by 67 publications

References 18 publications

Comparison of different gas models to calculate the spring force of a hydropneumatic suspension

Comparison of different gas models to calculate the spring force of a hydropneumatic suspension

Slow active suspension control for rollover prevention

Ride and Handling Analysis for an Active Anti-Roll Bar: Case Study on Composite Nonlinear Control Strategy

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