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Steering and Suspension Technology Symposium 2001

Delphi Saginaw Steering Systems-Edward F. Usewick
Delphi Chassis Systems-Robert J. Ackley
  • Special Publication (SP)
  • SP-1597
Published 2001-03-05 by SAE International in United States
This publication includes both suspension system level and component level papers. Focusing on mechanical aspects of suspension design and testing, such as kinematics, compliance and dynamics, as well as advancements in suspension component design and testing. Providing information on current trends of suspension design in the areas of factors affecting NVH and sideload compensating springs for strut suspensions.

Hydraulic Power Steering System Design and Optimization Simulation

Delphi Saginaw Steering Systems-Tom Wong
Published 2001-03-05 by SAE International in United States
Hydraulic rack and pinion power steering system is a high bandwidth servo with stringent performance requirements on accuracy, reliability, and cost. Design of such a system can be best achieved by using a validated and user friendly computer simulation program. Hydraulic integrated power steering ( HIPS ) program has been developed using basic concepts from science and engineering. HIPS provides a design and test environment for the integrated steering and suspension system subjected to disturbance forces, which may be induced by pump flow oscillations and tire loads. Two real-world automotive hydraulic steering systems are simulated with HIPS. The simulation results agree closely with the dynamometer test results. The application of HIPS for design optimization is also demonstrated.
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Thermal Duty Cycle Requirement Development and Enforcement in an Electric Power Steering System

Delphi Saginaw Steering Systems-Julie A. Kleinau
Published 2000-12-01 by SAE International in United States
Thermal duty cycle requirements in an electric power steering (EPS) system are a major cost driver. In order to develop these requirements, a technique has been developed to analyze load and time data from a vehicle level schedule and condense the load and time data into a compact specification for thermal duty cycle. This allows the duty cycle requirement to be determined at the vehicle level by the end customer and flowed down appropriately to the steering system and its components. In addition, a method which mimics the requirement process is used by the EPS algorithm to provide duty cycle enforcement and hence thermal protection, reducing the need for temperature measurement sensors.
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Correlation of Electric Power Steering Vibration to Subjective Ratings

Delphi Saginaw Steering Systems-Anthony J. Champagne
Published 2000-03-06 by SAE International in United States
A study was conducted to investigate the subjective responses to steering wheel vibration caused by the electric power steering. The objective was to correlate the subjective responses to a measurable parameter that can be used to assess various design alternatives. Evaluations of six steering wheel vibration levels were performed in a stationary vehicle. Two rating methods were used. Results showed a wide range of acceptability of steering wheel vibration over the conditions evaluated. RMS angular acceleration and peak to peak torque at the steering wheel shaft correlated best with subjective ratings.
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Classification of SRM Converter Topologies for Automotive Applications

Delphi Saginaw Steering Systems-Sayeed Mir
Published 2000-03-06 by SAE International in United States
One of the main aspects of the research in switched reluctance motor drives is the converter design. The performance and the cost of the drive is highly affected by performance of the converters. Although a number of converters have emerged over the years for SRM drives. All converters have their own advantages and drawbacks. There has always been a trade-off between gaining some of the advantages and losing some with each new topology. The selection of a converter, in most of the cases, depends upon the application. To facilitate the selection a comparative study is presented in this paper. A classification of SRM converter topologies with a detailed analysis of each topology is presented.
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Modeling and Analysis of an Electric Power Steering System

Delphi Saginaw Steering Systems-Aly Badawy, Jeff Zuraski, Farhad Bolourchi, Ashok Chandy
Published 1999-03-01 by SAE International in United States
An Electric Power Steering (EPS) System will be considered in this report. The modeling of this dynamic system will be achieved with both simplicity and usability taken into account. As such, a Reduced Order Model that reveals the important dynamic distinctions of the system will be developed from a more complex one. This model will be used to analyze various closed loop effects such as torque performance, disturbance rejection, noise rejection, road feel, and stability. These fundamental effects (compromises) are used toward the design of a desired control system. This modeling philosophy together with a comprehensive understanding of system compromises is essential to an optimized EPS system.
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Monitoring and Control of Equipment and Process in Cold Extrusion

Delphi Saginaw Steering Systems-R. Duggirala, D. Hitz
National Center for Manufacturing Sciences-K. Barnett
Published 1998-05-12 by SAE International in United States
Cold extrusion and forging processes are complex. They require monitoring and controlling the appropriate parameters to ensure high productivity and continued competitiveness of North American press and manufacturing companies. Current average productivity rates in high-volume, high-tonnage operations are often less than 60 percent, and the lost production capacity is mainly due to equipment failures and unreliable process control. The results presented in this paper pertain to identifying root causes for lost production in an automated facility running multiple high tonnage capacity presses and the tools developed to monitor and control the key parameters to improve productivity and eliminate downtime due to catastrophic equipment failure. To gain insight into various equipment and process related phenomena that lower productivity, a spectrum of sensors was installed inside of the dies and on mechanical components of two identical presses in the facility. A system comprising multiple computers and high volume magneto-optical storage archives and analyzes signals from these sensors to monitor the load on various components of the presses, process parameters and tonnage signatures. This system is also ableā€¦
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The Design and Benefits of Electric Power Steering

Delphi Saginaw Steering Systems-Aly A. Badawy, Farhad Bolourchi, Steve K. Gaut
Published 1997-12-31 by SAE International in United States
Electric power steering is a technology that will define the future. It eliminates the need for a power steering pump, hoses, hydraulic fluids, and a drive belt and pulley on the engine. As a result, electric power steering is energy efficient and environmentally compatible - while offering extras like simplified tuning, packaging flexibility and engine-off steering assist. With superior performance, electric power steering will be the technology that challenges the familiar, 50-year-old concepts of hydraulics.
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Active Damping Controls Algorithm for An Electric Power Steering Application

Delphi Saginaw Steering Systems-F. Bolourchi, C. Etienne
  • Technical Paper
  • 1997-25-0095
Published 1997-06-19 by ISATA - Dusseldorf Trade Fair in United Kingdom
Active Damping Algorithm is a controls software implemented in an Electric Power Steering (EPS) vehicle in order to alleviate the (Free Control) oscillations of the steering system. The term "Free Control" refers to an excessive oscillation of the steering column as it is returning to center under the action of chassis forces. This condition is not unique to EPS systems and could be present in other steering systems as well.In this paper we shall start by exposing the condition of Free Control oscillations through an analysis of the steering system dynamics. Couple of solutions describing the Active Damping algorithms are then presented. Both approaches are similar in their functionality (i.e., damping the excessive oscillations), but are different in terms of their implementation. Neither approach utilizes any additional sensors, not present in the base EPS system.The appropriate Active Damping solution is then picked for further analysis and field testing. The results are presented in the printed and/or video format at the end, followed by some concluding remarks.

Driver Performance Monitor, Data Acquisition and Development

Delphi Saginaw Steering Systems-C. A. Hennings, A. Badawy
General Motors Corp.-G. J. Clancy, D. M. Briggs
  • Technical Paper
  • 1996-25-0240
Published 1996-06-03 by ISATA - Dusseldorf Trade Fair in United Kingdom
Delphi Saginaw Steering Systems and General Motors Research Center have developed a testbed vehicle for the study of drowsy drivers and their detection, using a variety of sensors. Steering angle history can provide valuable insight as to the condition of the automobile driver. It is from this handwheel position history that we are developing a drowsy driver detection system. The paper will discuss on-board data acquisition equipment, data that has been collected to date, and a summary of the results. Possible solutions to the problem of drowsy driver detection will be discussed.