Control logic for an electric power steering system using assist motor

Through the AUTOSAR methodology, the embedded software shall become more flexible, reusable, maintainable than ever. However, it is not mentioned about specific timing constraints of software components in AUTOSAR. There are a few basic principles for mapping runnable entities. At this point, AUTOSAR software design with optimal scheduling method is one of the enabling technologies in vehicle embedded system. This paper presents an approach based on mapping runnable entities and task scheduling design method for EPS (Electric Power Steering) software components, based on AUTOSAR. In addition, the experimental results of concurrent simulation show that the proposed scheduling technique and timing synchronization in the software component design can achieve the improved torque ripple performance and it well suited for EPS application software. Keywords: EPS (Electric

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Section: Eps 시스템 1 Eps 시스템 소개unclassified

Scheduling Design and Simulation of Software Components for EPS System based on AUTOSAR

박광민¹,

금대현²,

손병점³

et al. 2010

Journal of Institute of Control, Robotics and Systems

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“…A frequently implemented control approach is a map based actuation of the motor. These so-called boost curves use the steering force/torque introduced by the driver and the vehicle speed to determine the assistance torque [6]. Advanced control methods e.g.…”

Section: Introductionmentioning

confidence: 99%

Design of an unknown input observer to enhance driver experience of electric power steering systems

Reichhartinger

Spurgeon

Weyrer

2016

2016 European Control Conference (ECC)

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Abstract-Electric power steering (EPS) systems assist the driver during manoeuvres by applying an additional steering torque generated by an electric motor. Although there are many advantages for electric actuated steering systems including fuel efficiency, they are known to deteriorate the feel of the steering as experienced by the driver. This paper presents a sliding mode observer based estimation concept which provides signals to evaluate and improve perception and feel of the steering as experienced by the driver. The proposed strategy is based on a physically motivated dynamic model of a power steering system and the measurements considered are typically available in any modern vehicle. The performance of the estimator is investigated using numerical simulation as well as experimental results obtained using a laboratory steering testbed.

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“…When an appropriate assistant torque by an assist motor is applied in the same direction as the driver's steering direction, the amount of steering torque required for steering can be significantly reduced [3][4][5][6]. In addition, adjustment of the characteristics of the assistant torque allows the driver to experience various steering feels [7]. Many research and technical papers on the EPS system have been published: basic principle and control algorithms were introduced in [3], a reference model based control strategy was proposed in [8], and a fuzzy logic based control method was presented in [9].…”

Section: Introductionmentioning

confidence: 99%

Design and Development of a Functional Safety Compliant Electric Power Steering System

Lee¹,

Lee²,

Moon³

et al. 2015

Journal of Electrical Engineering and Technology

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-ISO 26262 is an international standard for the functional safety of electric and electronic systems in vehicles, and this standard has become a major issue in the automotive industry. In this paper, a functional safety compliant electronic control unit (ECU) for an electric power steering (EPS) system and a demonstration purposed EPS system are developed, and a software and hardware structure for a safety critical system is presented. EPS is the most recently introduced power steering technology for vehicles, and it can improve driver's convenience and fuel efficiency. In conformity with the design process specified in ISO 26262, the Automotive Safety Integrity Level (ASIL) of an EPS system is evaluated, and hardware and software are designed based on an asymmetric dual processing unit architecture and an external watchdog. The developed EPS system effectively demonstrates the fault detection and diagnostic functions of a functional safety compliant ECU as well as the basic EPS functions.

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Control logic for an electric power steering system using assist motor

Cited by 209 publications

References 1 publication

Scheduling Design and Simulation of Software Components for EPS System based on AUTOSAR

Scheduling Design and Simulation of Software Components for EPS System based on AUTOSAR

Design of an unknown input observer to enhance driver experience of electric power steering systems

Design and Development of a Functional Safety Compliant Electric Power Steering System

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