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An ADAS Feature Rating System: Proposing a New Industry Standard

Velodyne LiDAR-David Heeren, Mircea Gradu
Published 2019-10-07 by SAE International in United States
More than 90% of new vehicles include Advanced Driving Assistance Systems that offer features such as Lane Keep Assist and Adaptive Cruise Control [1]. These ever-improving vehicle systems present a great opportunity to increase driving safety and reduce the number of roadway deaths and injuries. Indeed, they are already having a positive effect. However, the wide variety of features offered in the marketplace can be confusing to consumers, who may not clearly understand their vehicles’ true capabilities and limitations, or have an easy way of comparing system performance between vehicle models. This lack of information has the potential to reduce the safety gains of ADAS features by increasing the risk of improper use. To encourage transparency in the marketplace and thus engender the maximum positive effect of ADAS technologies, this paper proposes a five-level rating system, which utilizes diamonds to denote significant milestone achievements in vehicle system performance. The rating charts resulting from this system describe gradients of performance within criteria addressed by certain foundational ADAS features. Presented here in its initial stage of development,…
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Mechatronic Torque Vectoring System with Enhanced Controllability for Augmenting the Vehicle Agility and Safety

The Timken Company-John Feltman, John Ganley, Stuart Hamilton, Mircea Gradu
Published 2006-04-03 by SAE International in United States
This paper describes an advanced vehicle dynamics and traction control system, using magnetic-powder clutch technology combined with planetary gear sets.
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Advanced Bearing Solutions for Enhancing the Fuel Efficiency and Improving the Noise, Vibration and Harshness Behavior of Modern Automotive Driveline Applications

Timken Automotive-John Feltman, Mircea Gradu, Sharon Ross
Published 2005-04-11 by SAE International in United States
This paper summarizes selected enhancements provided by advanced tapered roller bearing solutions in automotive driveline applications. It also provides an objective comparison, based on test results, with alternative angular contact ball bearing arrangements. An extensive experimental and analytical investigation has been conducted in order to quantify the advantages of the newly developed bearing system.
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Highly Responsive Mechatronic Differential for Maximizing Safety and Driver Benefits of Adaptive Control Strategies

Timken Automotive-Stuart Hamilton, Mircea Gradu
Published 2004-03-08 by SAE International in United States
Sophisticated AWD technologies start to significantly penetrate the passenger car and crossover SUV market segments, aiming to enhance safety and fun-to-drive, rather than only focusing on the traction characteristics of the vehicle. This paper introduces a new active differential concept, which takes advantage simultaneously of a very comprehensive vehicle dynamics control software strategy and of advanced hardware capable to provide outstanding torque modulation characteristics. The differential assembly developed by Timken Automotive consists of magnetic particle clutches, mounted in a quasi-static torque split arrangement with planetary gear sets. This new mechatronic module offers simultaneously good power and torque density, which makes it suitable in particular for front wheel drive based vehicle platforms converted to all wheel drive configurations. A major advantage is the fact that the torque transfer characteristic does not depend on the input-output relative speed. Also, the differential actuation is purely electrical, allowing a high flexibility for the control algorithms. The paper presents a summary of the mechatronic module development process, its integration in the vehicle demonstrator and the test results validating its superior…
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Torque Bias Coupling for AWD Applications

Timken Automotive-Mircea Gradu
Published 2003-03-03 by SAE International in United States
The penetration of AWD technologies in the passenger car and crossover SUV market segments is increasing significantly. New market niches are created by changes in the customer priorities from emphasis on traction enhancements to safety, handling and fun-to-drive. This paper introduces a new Torque Bias Coupling concept, which addresses one of the major issues of the current designs: controllability. Essentially consisting of a magnetic particles clutch, mounted in a quasi-static torque split arrangement within a planetary gear set, the coupling offers simultaneously a good power and torque density, which makes it suitable in particular for front wheel drive based vehicle platforms converted to all wheel drive configurations. An important advantage consists of a torque transfer characteristic independent of the input-output relative speed. Also, the coupling actuation does not rely on a differential speed, allowing a high flexibility for the control algorithms. The paper presents different phases of the coupling development process, including various design solutions, performance validation based on test results and vehicle integration aspects.
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Transmission and Driveline Systems Symposium 2001

BorgWarner Automotive-Robert C. Lam
DaimlerChrysler Corp.-Berthold Martin, John C. Collins, Justin S. King, John G. Rasico
  • Special Publication (SP)
  • SP-1598
Published 2001-03-05 by SAE International in United States
The papers in this publication demonstrate recent advancements in the field of automotive transmission engineering. Topics covered include transmission subsystems, components and measurements techniques, advancement transmission concepts and controls, simulation, optimization and analysis of transmission systems, clutch materials technology.
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Investigation of Package Bearings to Improve Driveline Performance

The Timken Co.-Mircea Gradu, Klaas Batereau
Published 2000-06-19 by SAE International in United States
The tapered roller bearings employed in axle centers for the pinion support are critical components in determining the noise, fuel economy and reliability characteristics of the vehicle. They represent a relatively complex mechanical and tribological system, with special requirements from the stiffness, lubrication and heat transfer points of view.This paper brings a contribution to the investigation of the intricate dependency between design parameters, environmental factors and the resultant performance of a package bearing in an integral double cup configuration. Axial compactness, reduced weight, and superior rigidity are only few of the multiple advantages recommending this type of double row bearings for automotive driveline applications.Different aspects related to the tapered roller bearing setting are analyzed in a theoretical and experimental manner, also under the consideration of the manufacturing and assembly processes. The pinion package bearing is evaluated in a total system approach, which includes the interaction with the axle housing, shafts, gears and lubricants and seals.
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Tapered Roller Bearings with Improved Efficiency and High Power Density for Automotive Transmissions

The Timken Co.-Mircea Gradu
Published 2000-03-06 by SAE International in United States
This paper is focusing on the performance enhancement of the tapered roller bearings supporting the transfer shaft in a push belt type Continuously Variable Transmission (CVT). It also provides an objective comparison, based on test results, with the fixed/floating ball bearings alternative arrangement. The influence of different design parameters such as cup and cone race profile, roller length / diameter ratio, surface finish etc., is quantified in the analytical and experimental investigation. The bearings power loss is calculated and measured for operating conditions that are relevant in a vehicle fuel economy cycle.Additional specific aspects related to the use of tapered roller bearings, such as setting and mounting procedures, are discussed under similar considerations. The paper contains a system analysis of the transfer shaft interacting with the variator output shaft and with the differential. Shaft and gear mesh deflections are evaluated in the general context of system stiffness for improved durability and NVH behavior.The conclusions of this paper can be extended to the tapered roller bearings employed in other types of automotive transmissions; the CVT application…
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