An Experiment on Electric Power Steering (EPS) System of a CAR

Electric Power Steering for automobiles is primarily an energy saving scheme. Steering is the term applied to the collection of components, linkages, etc. which will allow a vehicle like a car Electric power steering offers greater vehicle safety by adapting variable steering ratios to human needs, filtering drive train influences and even adjusting active steering torque in critical situations. This is the latest technology in steering system; this system is work without maintenance, and fast response comparatively mechanical steering system. This paper introduces the basic composition of the electric power steering system, and put forward the reasonable design solutions of the soft hardware and the correction methods of controller, given the main technology index of the controller. It then describes the mechanisms involved, and the nuts and bolts of the all electric power steering systems for automobiles. Actuators, sensors and controllers that make electric power steering a reality in modern automobiles are described subsequently. In addition, it can make cars even lighter and more fuel efficient when compared to those using hydraulic steering systems. The central electronic elements of today's power steering systems are modern 32-bit microcontrollers, ARM controllers (MCUs). Since power steering is a safety-critical function, it also requires new MCU elements that support the functional safety of the overall system.

Journal of emerging technologies and innovative research, 2019

In the modern automobiles automation, terms like auto parking , auto driving havebeen given highest priority for safety and comfort of the customers.The aim of this work is to design and manufacture a jointless electric power steering and to remove the drawbacks of conventional steering system.This system is used to eliminate the problem of steer locking as well as reducing the effort for rotating the wheel during hill side areas which are faced in hydraulic steering system. Sensors like ultrasonic sensor and speed sensor are used. These sensors help to achieve instantaneous rotation of steering wheel and determination of speed of vehicle which are used as input to the electronic microcontroller. Using these inputs from different sensors, the microcontroller gives power to the electric motor which is connected directly to the reduction gear box. The power can be changed according to the rotation of wheel.The obtained power is used to customize steering rotation as per requirement us...

Mechatronics, 2002

Electric power steering (EPS) systems have many advantages over traditional hydraulic power steering systems in engine efficiency, space efficiency, and environmental compatibility. This research aims at developing EPS control logic for reduction of steering torque exerted by a driver, realization of various steering feels, and improvement of return-to-center performance. In addition, the torque sensor capable of measuring the steering torque and steering wheel angle is devised, and the hardware-in-the-loop simulation (HILS) system that can implement an actual load torque delivered to the steering column is also developed. With the proposed EPS logic, the driver can turn the steering wheel with the steering torque whose magnitude is determined from a torque map independent of load torques that tend to vary depending on the driving conditions. Experimental studies show that the proposed EPS control logic can improve return-to-center performance of the steering wheel by control of the assist motor. Ó

2013

Electric Power-Assisted Steering (Epas) Is A New Power Steering Technology That Will Define The Future Of Vehicle Steering. The Assist Of Epas Is The Function Of The Steering Wheel Torque And Vehicle Velocity. The Assist Characteristic Of Epas Is Set By Control Software, Which Is One Of The Key Issues Of Epas. The Straight-Line Type Assist Characteristic Has Been Used In Some Current Epas Products, But Its Influence On The Steering Maneuverability And Road Feel Hasn't Been Explicitly Studied In Theory. In This Paper, The Straight-Line Type Assist Characteristic Is Analyzed Theoretically. Then A Whole Vehicle Dynamic Model Used To Study The Straight-Line Type Assist Characteristic Is Built With Adams/Car And Validated With Dcf (Driver Control Files) Mode Of Adams/Car. Based On The Whole Vehicle Dynamic Model, The Straight-Line Type Assist Characteristic's Influence On The Steering Maneuverability And Road Feel Is Investigated. Based On The Driver's Request For The Ideal R...

According to the document ANR 09 VTT VOLHAND Doc B, presented on October 2011, the research team in Gipsa-Lab is involved into the task 5.2 (T5.2) for the design of the the amplification curves that can be adapted to disabled people. The typical architecture of an Electric Power Assistance Steering (EPAS) system includes a static map to provide the correct amplification to the driver's exerted torque. In literature, it is generally known as booster curve. This document concerns a preliminary study of the current methods diffused in literature to provide this amplification and is based on the results published in [6] and [11]. The basic concepts of the Electric Power Steering (EPS) systems with a realistic model for the friction contact, that acts on the wheels are discussed. A relation between the assistance and the driver's torque is provided, under the hypothesis of a position-oriented control of the movement and the Stevens' power law. Finally, the simulation results proposed at the end of this paper validate the shape of the booster curves and are in accord with the initial hypothesis. Contents 1 Introduction 2 Torques acting on the EPS system 3 Relation with the assistance torque 4 Problem formulation 5 Simulation results

2013

This work falls within the general context of the new generation of electric power assisted steering ( EPAS) , which aims to take into account characteristics of the drivers disabled . Nowdays, there is no power steering systems adapted to reduced capabilities of muscle joint or adapted to the pain felt by the driver, which is a failure from when we are interested in such populations. The main objective of this thesis is to propose a general methodology to adapt a standard EPAS to drivers disabled . The proposed methodology has been validated on a platform Hardware In the Loop and the experimental results clearly show the interest of the proposed approach . They also represent a starting point for the implementation of the proposed aid on a real vehicle and lay the groundwork for the application of the methodology to a large class of patients affected by different pathologies.

Driverless vehicles are anticipated to play a vital role in the forthcoming years as it enhance road safety, mitigate road congestion and has positive effect on environment. Lateral control is the primary concern in the development of these vehicles. In this paper, a fuzzy logic based controller is designed to steer the electric power assisted steering (EPAS) of a car without a driver. The controller steer the car by replicating the steering torque sensor signals (voltage) generated in human operated condition based on the steering angle error and the steering angle rate. The EPAS of a subcompact passenger car is modeled using first principles in MATLAB Simulink to analyze the performance of the controller. Results of simulation show that the proposed controller is a promising solution for autonomous steering control. The controller designed using MATLAB Simulink can be implemented real time in a sub compact passenger car with a rapid control prototyping system based on dSPACE.

2009

Driverless driving is one of the most interesting topics in the field of the intelligent transportation systems. Among these topics, the automation of the actuators involved in the management of a car, and out of them the control of the steering wheel constitute one of the most complex. In this paper, automatic power steering architecture to manage the steering wheel via Ethernet controller is developed. An on-board PC is connected to the controller to permit handling by computer generated signals. An electric car has been equipped with the system designed and tests to prove the behavior of the system in actual situations in the private driving circuit at the IAI facilities are included.

International Journal of Vehicle Autonomous Systems, 2003

While most passenger vehicles equipped with power steering systems are hydraulic power assisted, Electric Power Steering (EPS) systems are becoming wide spread since they can afford higher fuel efficiency. This paper develops an integrated simulation of an EPS control system with a full vehicle model. Using co-simulation technique, a full vehicle model interacting with 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 developed co-simulation capability may be useful for EPS performance evaluation and calibration as well as for vehicle handling performance integration.

2021

1,2,3,4B.E. Students, Automobile Engineering, PHCET RASAYANI, MAHARASHTRA, INDIA 5Professor, Automobile Engineering, PHCET RASAYANI, MAHARASHTRA, INDIA ---------------------------------------------------------------------***-------------------------------------------------------------Abstract The EPS (electric power steering) system has been used to replace the conventional HPS (hydraulic power steering) system in vehicles. This system assists the steering effort of the driver using an electric motor and gear force reduction. In a previous study, an EPS control method was proposed that used the driver's steering input torque and vehicle velocity. In addition, many papers have introduced estimation and control methods for the EPS motor's angular velocity or angular torque to reduce the sense difference for the HPS. Therefore, this paper proposes an advanced control strategy for EPS that uses the lateral force of the front wheels. In addition, we experimented with this propose...