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Straight-Line Braking Test for Truck and Bus Tires
- Ground Vehicle Standard
- J2673_202103
- Revised
Downloadable datasets available
Annotation ability available
Sector:
Issuing Committee:
Language:
English
Scope
This SAE Recommended Practice (RP) describes a test method for determination of heavy truck (Class VI, VII, and VIII) tire force and moment properties under straight-line braking conditions. The properties are acquired as functions of normal force and slip ratio using a sequence specified in this practice. At each normal force increment, the slip ratio is continually changed by application of a braking torque ramp. The data are suitable for use in vehicle dynamics modeling, comparative evaluations for research and development purposes, and manufacturing quality control.
This document is intended to be a general guideline for testing on an ideal machine. Users of this RP may modify the recommended protocols to satify the needs of specific use-cases; e.g., reducing the recommended number of test loads and/or pressures for benchmarking purposes. However, due care is necessary when modifying the protocols to maintain data integrity.
Rationale
The purpose of this revision is to correct minor errors in the existing document and to bring the document up to date in light of developments between 2010 and 2020. The original document referenced an over-the-road test machine that has since been decommissioned and is no longer available. The document has also been updated to include new classes of hybrid testing machines, one of which tests a tire while moving it over a paved surface in a controlled environment.
Recommended Content
| Ground Vehicle Standard | Free-Rolling Cornering Test for Truck and Bus Tires |
| Ground Vehicle Standard | Combined Cornering and Braking Test for Truck and Bus Tires |
| Ground Vehicle Standard | Low Speed Enveloping Test with Perpendicular and Inclined Cleats |
Topic
Data Sets - Support Documents
| Title | Description | Download |
|---|---|---|
| Unnamed Dataset 1 | ||
| Unnamed Dataset 2 | ||
| Unnamed Dataset 3 | ||
| Unnamed Dataset 4 | ||
| Table 1 | Symbols defined | |
| Table 2 | Laboratory machine control setting accuracies and ideal rates | |
| Table 3 | Measuring system ideal ranges | |
| Table 4 | Laboratory machine measuring system accuracies | |
| Table 5 | Over-the-road machine control setting accuracies and ideal rates | |
| Unnamed Dataset 10 | ||
| Table 6 | Over-the-road machine measuring system accuracies | |
| Unnamed Dataset 12 | ||
| Table 7 | Hybrid machine control setting accuracies and ideal rates | |
| Table 8 | Measuring system ideal ranges | |
| Table 9 | Hybrid machine measuring system accuracies | |
| Table 7 | Units of force and moment gains | |
| Table 8 | Layout of interaction matrix C | |
| Table 9 | Units for interaction matrix terms | |
| Table 13 | The straight-line braking test inflation pressure “p” is as determined in ; S is at the engineering user’s choice. | |
| Unnamed Dataset 20 | ||
| Table A2 | Test for surface friction control tire |
Issuing Committee
The Tire Committee is organized under the SAE Truck-Bus Council Total Vehicle Steering Committee and has the responsibility to initiate, develop, review and approve the SAE Technical Reports (Standards, Recommended Practices, and Information Reports) related to tires used on medium- and heavy-duty trucks and buses with GVWRs greater than 10,000 lbs. Such vehicles include vans, utility vehicles, trucks, truck tractor combinations, trailers and buses. This scope of work is done on behalf of the Total Vehicle Steering Committee, SAE Truck-Bus Council, the Technical Standards Board, and to serve the best interests of the public.The Tire Committee provides the support, review, and approval of the work of the following tire sub-committees and task forces: Truck Tire Characterization and Military Industry Tire
Reference
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