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Inertia Calculation for Single-Ended Inertia-Dynamometer Testing
- Ground Vehicle Standard
- J2789_201809
- Revised
Downloadable datasets available
Annotation ability available
Sector:
Issuing Committee:
Language:
English
Scope
This procedure provides methods to determine the appropriate inertia values for all passenger cars and light trucks up to 4540 kg of GVWR. For the same vehicle application and axle (front or rear), different tests sections or brake applications may use different inertia values to reflect the duty-cycle and loading conditions indicated on the specific test.
Rationale
New powertrain technologies including regenerative braking require a different approach to determine or estimate the correct test inertia for the foundation brake. This revision provides some key concepts to take into account for regen braking evaluation, and guidelines or default calculations to adjust the test inertia for a given vehicle application.
Recommended Content
| Ground Vehicle Standard | FMVSS Inertia Dynamometer Test Procedure for Vehicles Below 4540 kg GVWR |
| Ground Vehicle Standard | Dynamometer Global Brake Effectiveness |
| Ground Vehicle Standard | Verification of Brake Rotor and Drum Modal Frequencies |
Topic
Data Sets - Support Documents
| Title | Description | Download |
|---|---|---|
| Table 1 | Inertia split for fully-operational systems with fixed brake proportioning | |
| Table 2 | Inertia split for fully-operational systems with electronic brake distribution |
Issuing Committee
Brake Dynamometer Standards Committee
The Brake Dynamometer Standards Committee is part of the Foundation Brake Steering Committee that reports to the Motor Vehicle Council. The committee is responsible for developing standards, recommended practices, and information reports for brake dynamometer testing, for on-road vehicles below 4540 kg of Gross Vehicle Weight Rating. The committee also maintains liaison activities with other Standard Development Organizations or industry consortia.
Reference
| Number | Title |
|---|---|
| ISO611 | This document is not part of the subscrption. |
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