scholarly journals Hardware in the loop simulation technology evaluation method for power steering systems

2021 ◽  
Vol 2061 (1) ◽  
pp. 012137
Author(s):  
I S Potashov ◽  
A I Bokarev
Keyword(s):  
Technology Implementation ◽  
Evaluation Method ◽  
Adaptive Algorithms ◽  
Steering System ◽  
Testing Time ◽  
Hardware In The Loop ◽  
Technology Evaluation ◽  
Time Consumption ◽  
Power Steering ◽  
Steering Torque

Abstract In the paper, the method of measuring and assessing of steering systems with the help of test benches with HILS technology implementation is justified in part of the adaptive algorithms of the regulation of the assistant steering torque. In the article, overall principal of creating virtual – physical system using as a physical part the rack and pinion steering system with electromechanical assistant is described. Interaction of the physical and virtual parts and fields of usage are described. Development, calibration and tweaking of the newly designed ECU and adaptive algorithms suppose a lot of testing. Time consumption and difficultness can be reduced only by the way of carrying out bench tests with usage of HILS technology.

Hardware-in-the-Loop Simulation of Functional Safety Compliant Electric Power Steering System

2015 ◽  
Vol 781 ◽  
pp. 500-503
Author(s):  
Kyung Jung Lee ◽  
Hyun Sik Ahn
Keyword(s):  
Electric Power ◽  
Steering System ◽  
Functional Safety ◽  
Hardware In The Loop ◽  
Electric Power Steering ◽  
Automotive Safety ◽  
Iso 26262 ◽  
Power Steering ◽  
Safety Integrity Level ◽  
Electric Power Steering System

In this paper, we propose a hardware-in-the-loop simulation (HILS) for functional safety compliant electric power steering (EPS) system. The proliferation of electric and electronic systems in vehicles has brought the new automotive standard ISO 26262 for the safety of functions. The proposed EPS system should be Automotive Safety Integrity Level (ASIL) D compliant, which is the highest ASIL level. Therefore, EPS system complies with functional safety and HILS is configured to verify performance of functional safety compliant EPS system.

A Semi-Physical Model of a Hydraulic Power Steering System for Vehicle Dynamics Simulations

2006 ◽  
Author(s):  
Federico Cheli ◽  
Elisabetta Leo ◽  
Edoardo Sabbioni ◽  
Andrea Zuin
Keyword(s):  
Steering System ◽  
Steering Wheel ◽  
Hydraulic Power ◽  
Power Steering System ◽  
Power Steering ◽  
The Difference ◽  
Steering Torque ◽  
Hydraulic Power Steering System ◽  
Hydraulic Power Steering ◽  
Reaction Torque

A semi-physical model of an hydraulic power steering system is presented in this paper. The proposed model allows to evaluate the wheels dynamic response to steering inputs and to calculate the corresponding reaction torque on the steering-wheel (steering torque). The analyzed steering system increases its stiffness (so that the steering assist level is decreases) with the rise of the vehicle speed. Thus, vehicle maneuverability is improved during parking maneuvers, while at high vehicle speeds, stability and driver perceived steering feel are ensured. A two d.o.f. (steering-wheel and rack-pinion rotations) model has been implemented during this study. The model parameters have been identified through the standard laboratory tests carried out to characterize a steering system, minimizing the difference between the experimental data and the model numerical results. During laboratory tests the hydraulic power system has been characterized first, measuring its stiffness variation as a function of the relative rotation between the steering-wheel and the rack-pinion, and the steering torque as a function of the difference between the delivery and the reversal pressure of the double-acting ram. The complete steering system has been then characterized, suspending the vehicle and placing the wheels on appropriate low-friction plates which permit them to turn; sine and frequency sweep steering input have been applied by a robot and the corresponding reaction torque on the steering-wheel has been measured. Simulations results are in good agreement with the experimental ones for all the performed tests. The steering system model has been integrated into a 14 d.o.f. vehicle model developed by the Mechanical Department of the Politecnico di Milano in order to access its reliability during handling maneuvers. Several simulations have been performed both in open (step-steer, steering pad, etc.) and in closed loop (lane change, double lane change, slalom, etc). Simulation results have shown a reduction of the toe angle due to the deformability of the steering system and a time delay of the wheel angle respect to the cinematic condition introduced by the steering system dynamics. The reaction torque on the steering-wheel has also been calculated during the simulations to access the driver perceived steering feel during the maneuvers.

Matching strategy of electric power steering assistant characters based on the vehicle inherent road feel

2011 ◽  
Vol 225 (11) ◽  
pp. 1481-1491 ◽  
Author(s):  
Y H Liu ◽  
X W Ji
Keyword(s):  
Electric Power ◽  
High Performance ◽  
Steering System ◽  
Lateral Acceleration ◽  
Electric Power Steering ◽  
Vehicle Performance ◽  
Power Steering ◽  
Matching Strategy ◽  
Steering Torque ◽  
Good Vehicle

Matching the assistant characters of an electric power steering (EPS) system so that the vehicle achieves a high performance is one of the key technologies in EPS design. A study on the matching strategy of EPS assistant characters is conducive to obtaining a good ‘vehicle performance’ earlier in the design process. This paper describes a method for designing the assistant characters of an EPS system based on the vehicle’s inherent ‘road feel’ denoted here as the steering torque gradient at a 0 g or 0.1 g lateral acceleration under the condition that the steering system is not a power-assisted system. With the aim of obtaining the vehicle’s inherent road feel, the relations between the steering resistant torque and the vehicle’s travel states are analysed on the basis of a two-wheel vehicle model with a uniform normal tyre force distribution in steady state circle cornering. It is found that the vehicle’s inherent road feel decreases with increasing speed especially in the low-speed regions. The matching strategy of EPS assistant characters based on the vehicle’s inherent road feel is presented and illustrated by designing the assistant characters of a sample EPS system utilized in a passenger car. It is found that the EPS system designed by this strategy can supply a good steering feel to the driver.

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