Dynamic analysis and stability of a power assist steering system

Zaremba, A.T.; Davis, R.I.

doi:10.1109/acc.1995.532736

Cited by 41 publications

(11 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In other words, it consists of a real-time vehicle kinetics model and convenient testing of the EPS and programming (Ludger, 1996;Zaremba and Davis, 1995;Choi et al, 1995).…”

Section: Simulation Of a Vehicle Modelmentioning

confidence: 99%

Development of a hardware in the loop simulation system for electric power steering in vehicles

Lee

et al. 2011

Int.J Automot. Technol.

View full text Add to dashboard Cite

In this paper, a hardware-in-the-loop simulation (HILS) system was developed before the development of an electric power steering (EPS) system in a vehicle. This study was focused on the establishment of the HILS system. Driving conditions are simulated with the HILS system. The actual steering input parameters are confirmed on the monitor while driving the HILS system. The steering forces observed in the simulation with the developed HILS system are similar to those in real vehicle tests. The developed HILS system can be applied in the development of various types of EPS systems.

show abstract

“…In other words, it consists of a real-time vehicle kinetics model and convenient testing of the EPS and programming (Ludger, 1996;Zaremba and Davis, 1995;Choi et al, 1995).…”

Section: Simulation Of a Vehicle Modelmentioning

confidence: 99%

Development of a hardware in the loop simulation system for electric power steering in vehicles

Lee

et al. 2011

Int.J Automot. Technol.

View full text Add to dashboard Cite

show abstract

“…A power steering, as basically power-assisted standard steering, is mainly classified into two types according to the way they provide assist torque [6][7][8]. The two types are hydraulic power steering (HPS) and electric power assist steering (EPAS).…”

Section: Introductionmentioning

confidence: 99%

Unknown-input estimator-based controller design of electric power-assisted steering system

Mahmoud

Emzir

2012

IET Control Theory Appl.

View full text Add to dashboard Cite

In this study, the control design problem of double-pinion-type electric power assist steering (EPAS) is carefully examined. Based on a Lagrangian-based dynamical model, an optimal control approach with unknown input is formulated thereby eliminating the need for torque sensor. A new controller is developed using combination of non-linear assist curve, unknown-input estimator (UIE) and linear quadratic integral theory. It has been established that the estimation of the state, and unknown input using UIE yields a good estimate with performance compared with the well-known Kalman estimator. It is further shown that the resulting closed-loop response is able to track non-linear assist curve for different velocity. This reveals a salient feature, that is, controlling an EPAS system can be done using only single constant gain.

show abstract

“…The steering system is modelled with 2 DoF with Coulomb friction together with a 3 DoF linear vehicle model. In the work done by Zaremba and Davis, 1995, the choice was a 2 DoF model for the mechanical structure, with the purpose of analysing stability in the frequency domain of an EPAS system. Since the system studied is the test rig without wheel assembly and vehicle and since the operating range where the steering system is studied in this work is similar to that in, for example, , it should be sufficient to use a 2 DoF model for the purpose of describing the behaviour of the system and to predict the steering wheel torque under different conditions.…”

Section: Mechanical Submodelmentioning

confidence: 99%

On Electrohydraulic Pressure Control for Power Steering Applications : Active Steering for Road Vehicles

Dell’Amico¹

2016

View full text Add to dashboard Cite

This thesis deals with the Electrohydraulic Power Steering system for road vehicles, using electronic pressure control valves. With an ever increasing demand for safer vehicles and fewer traffic accidents, steering-related active safety functions are becoming more common in modern vehicles. These are functions that aim at assisting the driver in more or less critical situations and could be anything from applying a guiding steering torque to taking over the steering completely. Future road vehicles will also evolve towards autonomous vehicles, with several safety, environmental and financial benefits. A key component in realising such solutions is active steering. This refers to the possibility to control the steering angle or steering torque with an electronic signal.The power steering system was initially developed to ease the driver's workload by assisting in turning the wheels. This is traditionally done through an open-centre hydraulic system and heavy trucks must still rely on fluid power, due to the heavy work forces. The system provides a robust solution but suffers from poor energy efficiency and lacks the possibility of active control. Since the purpose of the original system is to control the assistive pressure, one way would be to use proportional pressure control valves. Since these are electronically controlled, active steering is possible and with closed-centre, energy efficiency can be significantly improved on.In this work, such a system is analysed in detail with the purpose of investigating the possible use of the system for Boost curve control, the most common control strategy in power steering systems, and position control for autonomous driving. Commercially available valves are investigated since they provide an attractive solution. A model-based approach is adopted, where simulation of the system is an important tool. Detailed models at both a component level and a system level are developed and form the basis of the analysis and control design. Another important tool is hardware-in-the-loop simulation. A test rig of the system, that also includes the original system, is developed. The rig supports the modelling and validation process, as it also makes it possible to verify control concepts on a real system. This work has shown how proportional pressure control valves can be used for Boost curve control and position control and what implications this has i on a system level. As it turns out, the valves add a great deal of phase shift and with the high gain from the Boost curve, this creates a control challenge. The problem can be handled by tuning the Boost gain, pressure response and damping and has been effectively shown through simulation and experiments. For position control, there is greater freedom to design the controller to fit the system. The pressure response can be made fast enough for this case and the phase shift is much less critical.Keywords: Electrohydraulic power steering, pressure control, closed-centre steering, Boost curve control, autonomous driving, hardware-...

show abstract

Dynamic analysis and stability of a power assist steering system

Cited by 41 publications

References 3 publications

Development of a hardware in the loop simulation system for electric power steering in vehicles

Development of a hardware in the loop simulation system for electric power steering in vehicles

Unknown-input estimator-based controller design of electric power-assisted steering system

On Electrohydraulic Pressure Control for Power Steering Applications : Active Steering for Road Vehicles

Contact Info

Product

Resources

About