Parametric design and application of steering characteristic curve in control for electric power steering

Zhao, Xin; Li, Xin; Chen, Jie; Men, Jinlai

doi:10.1016/j.mechatronics.2009.05.003

Cited by 24 publications

(7 citation statements)

References 7 publications

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“…It can be validated that when q→∞, with the new defined Ξ 1 The step responses and the Nyquist curves of the control system designed by LQG/LTR method were shown in Figures 4 and 5. The value of q was 1, 10 2 , 10 4 , 10 6 , 10 8 , 10 10 , respectively.…”

Section: A P Pa P Br B P C Qcmentioning

confidence: 85%

“…In recent years, based on the development of the electronic control technology, the power steering (EPS) technology has been greatly developed [1][2][3][4][5]. But the EPS system doesn't get rid of mechanical connections, and the maneuverability cannot be substantially improved due to the mechanical limitations, such as the constant transmission ratio, etc.…”

Section: Introductionmentioning

confidence: 99%

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Stability control strategy of steer-by-wire system based on LQG/LTR

Zhang

Zhao

2017

Sci. China Technol. Sci.

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A control strategy based on LQG/LTR theory for steer-by-wire (SBW) system is proposed in this paper. Firstly, the models of the SBW system and the whole vehicle are constructed. Secondly, the control strategy of LQG for SBW system is proposed, in which the LTR is utilized to eliminate the effect from the Kalman filter. Thirdly, simulations based on the co-simulation platform of MATLAB/Simulink and Carsim are performed with the proposed control strategy to identify its performance. At last, field experiments are conducted to further verify the feasibility of the proposed control strategy in real application. The simulation and experiment results indicate that the proposed control strategy has good stability, robustness and feasibility in real application, and is more effective in practical application of SBW system. steer-by-wire (SBW), LQG/LTR, stability control, robustness, Kalman filter Citation:Zhang H, Zhao W Z. Stability control strategy of steer-by-wire system based on LQG/LTR. Sci China Tech Sci,

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Section: A P Pa P Br B P C Qcmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Stability control strategy of steer-by-wire system based on LQG/LTR

Zhang

Zhao

2017

Sci. China Technol. Sci.

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“…2 Meanwhile, due to the improvement of energy saving and safety requirements, the electrification of steering system has become an inevitable trend. 3 The electro-hydraulic power steering (EHPS) system changes the power source from the engine to the motor, reducing the steering energy consumption and changing the power assist characteristics by adjusting the flow. 4–6 Because of the inherent characteristics of hydraulic system, the energy consumption is still high.…”

Section: Introductionmentioning

confidence: 99%

Coordinated control strategy for vehicle electro-hydraulic compound steering system

Guo

Zhao

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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In order to reduce steering energy consumption and improve steering feeling of heavy commercial vehicle, a novel electro-hydraulic compound steering system is proposed, which combines the function of electro-hydraulic power steering and electric power steering. The electro-hydraulic compound steering system dynamic model is established and the coordinated control strategy of dual actuators is proposed by analyzing the structure and dynamic characteristics of electro-hydraulic compound steering system. The genetic algorithm is used to optimize the steering assist torque distribution, and an Elman neural network predictive controller with fuzzy compensation is designed to solve the nonlinear problem of the electro-hydraulic compound system. Finally, the simulation is carried out by using Amesim/Simulink. The simulation results show that the coordinated control strategy designed in this paper enables the electro-hydraulic compound steering system significantly better than the traditional electro-hydraulic power steering system in steering feeling and energy consumption.

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“…1 The shape and dynamics of these curves were studied in the literature to provide better assistance and steering feel for drivers. [2][3][4][5][6] Typically, the steering characteristic curves are bi-linear or multi-linear functions of the steering torque. For example, Figure 1a shows a typical steering characteristic curve which is a bi-linear function of the column torque, where the rate of assistance varies with the vehicle speed.…”

Section: Introductionmentioning

confidence: 99%

Design and evaluation of an observer-based disturbance rejection controller for electric power steering systems

Mehrabi

McPhee

Azad

2015

Proceedings of the Institution of Mechanical Engineers, Part D:

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The goal of this paper is to develop an observer-based disturbance rejection Electric Power Steering (EPS) controller to provide steering assistance and improve the driver's steering feel. For the purpose of control design, a control-oriented model of a vehicle with a column-assist EPS system is developed and verified against a high-fidelity multibody dynamics model of the vehicle. The high-fidelity model is used to mimic vehicle dynamics to study controller performance in realistic driving conditions. Then, a Linear Quadratic Gaussian approach is used to design an EPS optimal controller, in which a Kalman filter estimates the unmeasured steering system's states and external disturbance. A new formulation for the Linear Quadratic Regulator objective function is proposed to take advantages of the known information about the system dynamics to attenuate the disturbance and magnify the driver's torque.Finally, the EPS controller is applied to the high-fidelity vehicle model in a software-in-the-loop simulation to evaluate its robustness and performance under realistic conditions. The results show that the proposed controller can effectively reduce the disturbance induced in the steering rack, and simultaneously magnify the driver's steering torque by use of a bi-linear EPS characteristic curve. Then, to show the disturbance rejection properties of this EPS controller, its performance is compared to H 2 /H ∞ and PID control designs using time and frequency domain analysis.

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Parametric design and application of steering characteristic curve in control for electric power steering

Cited by 24 publications

References 7 publications

Stability control strategy of steer-by-wire system based on LQG/LTR

Stability control strategy of steer-by-wire system based on LQG/LTR

Coordinated control strategy for vehicle electro-hydraulic compound steering system

Design and evaluation of an observer-based disturbance rejection controller for electric power steering systems

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