Improvement of Driver's Feel of Electric Power Steering

Okamoto, Keiichiro; Chikuma, Isamu; Saito, Naoki; Miyazaki, Hiroya

doi:10.4271/890079

Cited by 9 publications

(3 citation statements)

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“…This means that the inertia moment of the motor can have a noticeable effect and degrade the steer feeling when steering operation takes place in the manual steering region around the steering wheel center, for example, during high speed driving. Therefore, various methods were used in the past to limit the influence of the inertia moment on steer feeling by correcting the motor assist signal, such as by applying correction to the motor assist signal using the steering rotation signal (1) or the differentiated steering torque signal (5) . The steer feeling was then matched to the vehicle characteristics by adjusting these correction amounts in combination with the assist amount settings.…”

Section: Journal Of Mechanical Systems For Transportation and Logisticsmentioning

confidence: 99%

Evaluation Method for Steer Assist Feeling around Steering Center and Control Design on EPS

Oniwa

Shimizu

2008

JMTL

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In this research, a method of designing an EPS control system that achieved a good steer feeling without using an actual vehicle was examined. Firstly, evaluation functions to evaluate steer feeling theoretically were set. And it was described that steer feelings such as "inertial feeling" and "viscous feeling" could be expressed by the evaluation functions. Secondly, a target characteristic that made the steer feeling good was determined on the evaluation function, and control methods to theoretically achieve this target characteristic were described. Finally, the designed control system was installed in an EPS vehicle. As a result, it was confirmed that the steer feeling in an actual vehicle was fine with no "inertial and viscous feeling".

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Section: Journal Of Mechanical Systems For Transportation and Logisticsmentioning

confidence: 99%

Evaluation Method for Steer Assist Feeling around Steering Center and Control Design on EPS

Oniwa

Shimizu

2008

JMTL

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“…Earlier work has focused mainly on developing the EPS control algorithm. Okamoto et al [2] investigated the influence of inertia and friction of the motor used in EPS on the driver's feel. Smith et al [3] proposed that a power steering shudder can be analysed as a control system with a closed-loop limit cycle caused by the interaction of the chassis and the steering system.…”

Section: Introductionmentioning

confidence: 99%

Co-simulation and simulation integration for a full vehicle dynamic system

Jang¹,

Choi²

2007

Mathematical and Computer Modelling of Dynamical Systems

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The electric power steering (EPS) mechanism ensures improved vehicle safety and fuel economy. The development of a concurrent simulation technique and a simulation integration technique for analysing an EPS control system with a dynamic vehicle system is described in this paper. A full vehicle model interacting with an EPS control algorithm was concurrently simulated on a single-bump road condition. The dynamic responses of the vehicle chassis and the steering system resulting from impact with the road surface were evaluated and compared with experimental data obtained at the proving ground. Reasonable agreement was obtained for tie-rod load, rack displacement, steering wheel torque, and tyre centre acceleration. The concurrent simulation capability was employed for EPS performance evaluation and calibration as well as for vehicle-handling performance integration and synthesis.

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“…However, these efforts focused on control algorithm development and used only simpli ed representations to approximate the mechanical characteristics of a vehicle in developing a control system. Okamoto et al [3] investigated the effects of inertia and friction of the motor used in EPS on the feeling of the driver. The feeling of the driver was de ned as the returnability (addressed later) and vibration shaking of the steering wheel.…”

Section: Introductionmentioning

confidence: 99%

Cosimulation of multi-body-based vehicle dynamics and an electric power steering control system

Liao

2001

Proceedings of the Institution of Mechanical Engineers, Part K:

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Increasing use of electric power steering (EPS) systems, which affect vehicle dynamic behaviour, has prompted the need for a more effective method of analysing control systems coupled with detailed vehicle models. This paper develops an integrated simulation of an EPS control system with a full-vehicle dynamic model. Using a cosimulation technique, a multi-body-based full-vehicle dynamic model interacting with the EPS control algorithm is concurrently simulated on a single-bump road condition. The effects of EPS on the vehicle dynamic behaviour and handling responses resulting from steer and road input are analysed and compared with proving ground experimental data. The comparisons show reasonable agreement on tie rod load, rack displacement, steering wheel torque and tyre centre acceleration. This cosimulation capability may be useful for EPS performance evaluation and calibration, as well as for vehicle handling performance integration.

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Improvement of Driver's Feel of Electric Power Steering

Cited by 9 publications

References 0 publications

Evaluation Method for Steer Assist Feeling around Steering Center and Control Design on EPS

Evaluation Method for Steer Assist Feeling around Steering Center and Control Design on EPS

Co-simulation and simulation integration for a full vehicle dynamic system

Cosimulation of multi-body-based vehicle dynamics and an electric power steering control system

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