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Vehicle Dynamics, Stability and Control, 2017

2017-03-28
This technical paper collection is focused on vehicle dynamics and controls using modeling and simulation, and experimental analysis of passenger cars, heavy trucks, and wheeled military vehicles. The papers address active and passive safety systems to mitigate rollover, yaw instability and braking issues; driving simulators and hardware-in-the-loop systems; suspension kinematics and compliance, steering dynamics, advanced active suspension technologies; and tire force and moment mechanics.
Standard

Brake Rotor Thickness Variation and Lateral Run-Out Measurements

2015-10-02
WIP
J3111
The scope of this recommended practice is to establish definitions and recommended methods for the measurement of lateral run-out and disc thickness variation in the laboratory and vehicle for passenger cars and light duty trucks up to 4546 kg gross vehicle weight. This recommended practice will breakdown the instrumentation (sensors and sizes), test setup, and data processing.
Standard

Coiled Tubing Assemblies for Heavy Duty Air Brake Applications

2013-04-30
WIP
J3041
This SAE Standard establishes the minimum performance and endurance requirements for coiled air brake tubing assemblies used for hookup between tractors, trailers and converter dollies. The Standards SAE J844 and SAE J246 along with J1131 must be consulted to determine the complete performance and endurance requirements of individual components of the system. Related TMC Recommended Practices may be consulted for information associated with selection, installation and inspection of these assemblies. This document is intended to set out requirements for the majority of conditions rather than for specialized applications or environments.
Standard

Performance Requirements for Nonmetallic Air Brake System Tubing

2014-08-26
WIP
J2547
This SAE Standard covers the minimum requirements for nonmetallic tubing as manufactured for use in air brake systems which tubing is different from that described in SAE J844. It is not intended to cover tubing for any portion of the system which operates continuously below - 40 degrees C or above +93 degrees C, above a maximum working gage pressure of 1.0 MPa, or in an area subject to attack by battery acid. This tubing is intended for use in the brake system for connections, which maintain a basically fixed relationship between components during vehicle operation. Coiled tube assemblies required for those installations where flexing occurs are covered by this document, SAE J1131 and SAE J2494-3, to the extent of setting minimum requirements on the essentially straight tube and tube fitting connections which are used in the construction of such assemblies.
Standard

Validation of Compressibility Test Systems for Friction Materials

2016-02-17
WIP
J3079/1
This SAE Recommended Practice applies to the validation process required for test systems used to measure deflection or compressibility of friction materials and friction material assemblies for passenger cars, light trucks, and commercial vehicles equipped with hydraulic or air brake systems, and using disc or drum brakes.
Standard

Balance Weight and Rim Flange Design Specifications, Test Procedures, and Performance Recommendations for Heavy Vehicle Applications

2018-04-12
WIP
J3172
This SAE Recommended Practice is intended to serve as a guide for standardization of features, dimensions, and configurations of balance weights for aluminum and steel wheels intended for use on Heavy Truck/Vehicles (Class 5-8) to assure good installation and retention of the balance weight. This document also provides test procedures and minimum performance requirements for testing balance weight retention.
Standard

Concepts, Terms and Definitions Related to Surrogate Measures of Safety

2018-01-12
WIP
J3166
The document will define and describe in condensed form the fundamental theoretical concepts of surrogate measures of safety and define indicators (with variations). To the extent possible, the definitions should be kept neutral with respect to the technology or data collection method used as these change rapidly.
Standard

Component Level EPB Actuation NVH

2018-01-10
WIP
J3165
The component level EPB actuation NVH task force should review existing specifications and measurement methods used in the industry to find any commonalities and propose a recommended method for measuring and evaluating component level EPB actuation NVH to be used as a common standard throughout the industry. The task force should acknowledge the following objectives: 1. Task force should review existing industry specifications and further define the scope for creating the new standalone component level EPB actuation NVH standard a. The common standard should be universally recognized and accepted by the automotive industry b. Provide confidence that acceptable vehicle related NVH results will be achieved if vehicle level testing is completed c. Provide clear verifiable acceptance criteria 2. Task force must lay out steps and timing to complete the development of the new common standard. 3.
Standard

Electric Park Brake Sizing

2017-10-16
WIP
J3158
The scope of this new recommended practice should include, but not necessarily be limited to: 1. Define vehicle operating conditions used to drive MOC-EPB actuator design and selection 2. Define brake corner operating conditions (e.g. temperature and state of burnish) used to drive MOC-EPB actuator design and selection 3. Define actuator operating conditions (e.g. temperature, voltage, current limit, and state of wear) used to drive MOC-EPB actuator design and selection 4. Define methodology for addressing part to part variation in performance
Standard

Dynamometer Low-Frequency Brake Noise Test Procedure

2017-07-18
WIP
J3002
This procedure will outline the necessary test equipment (fixturing, dynamometer, data acquisition system, etc.) and test sequence required to test for low-frequency brake noise on a brake noise dynamometer. It is intended to complement SAEJ2521, which focuses on high-frequency brake squeal.
Collection

AeroTech - Automated Fastening/Assembly & Tooling, 2011

2011-10-18
This collection features 29 technical papers including, innovative end-effectors, orbital drilling, vision systems, fastener installation, industrial robotics, and more. This collection features 29 technical papers including, innovative end-effectors, orbital drilling, vision systems, fastener installation, industrial robotics, and more.
Collection

Vehicle Dynamics, Stability and Control, 2018

2018-04-03
This technical paper collection is focused on vehicle dynamics and controls using modeling and simulation, and experimental analysis of passenger cars, heavy trucks, and wheeled military vehicles. The papers address active and passive safety systems to mitigate rollover, yaw instability and braking issues; driving simulators and hardware-in-the-loop systems; suspension kinematics and compliance, steering dynamics, advanced active suspension technologies; and tire force and moment mechanics.
Collection

Steering and Suspension Technology Symposium, 2017

2017-03-28
The papers in this collection are to provide a forum for presentations on steering and suspension related topics as it applies to ground vehicles. Papers address new approaches as well as advances in application of steering, suspension related technologies.
Video

Flexible Real-Time Simulation of Truck and Trailer Configurations

2011-12-05
Real-time simulation of truck and trailer combinations can be applied to hardware-in-the-loop (HIL) systems for developing and testing electronic control units (ECUs). The large number of configuration variations in vehicle and axle types requires the simulation model to be adjustable in a wide range. This paper presents a modular multibody approach for the vehicle dynamics simulation of single track configurations and truck-and-trailer combinations. The equations of motion are expressed by a new formula which is a combination of Jourdain's principle and the articulated body algorithm. With the proposed algorithm, a robust model is achieved that is numerically stable even at handling limits. Moreover, the presented approach is suitable for modular modeling and has been successfully implemented as a basis for various system definitions. As a result, only one simulation model is needed for a large variety of track and trailer types.
Video

Development of an Electrically-driven Intelligent Brake Unit

2012-02-16
An electrically-driven, intelligent brake unit has been developed, to be combined with a regenerative braking system in electric vehicles (EVs) and hybrid electric vehicles (HEVs) which went into production in 2010 - 11. The brake pedal force is assisted by an electrically driven motor, without using vacuum pressure, unlike conventional braking systems. The actuator can be implemented to coordinate with a regenerative braking system, and to have adjustable pedal feel through use of a unique pressure-generating mechanism and a pedal-force compensator. In this paper, we describe features of the actuator mechanism and performance test results Presenter Yukio Ohtani, Hitachi Automotive Systems
Video

Real-time Tire Imbalance Detection Using ABS Wheel Speed Sensors

2011-11-15
This presentation proposes an approach to use ABS wheel speed sensor signals together with other vehicle state information from a brake control module to detect an unbalanced tire or tires in real-time. The proposed approach consists of two-stage algorithms that mix a qualitative method using band-pass filtering with a quantitative parameter identification using conditional least squares. This two-stage approach can improve the robustness of tire imbalance or imbalances. The proposed approach is verified through vehicle testing and the test results show the effectiveness of the approach. Presenter Jianbo Lu, Ford Motor Co.
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