J3039_202012 Definition and Measurement of Power Transfer Unit Speed-Dependent Parasitic Loss

Issued

12/30/2020

Features
Issuing Committee
Scope
Content
This SAE Recommended Practice covers power transfer units (PTUs) used in passenger car and sport utility vehicles to support all wheel drive (AWD) operation. PTUs are typically full-time use geared devices (see 3.1). Some PTUs have additional features such as part-time on-demand capability via electronically actuated disconnect features, and other configurations are possible.
Rationale
Content
New government regulations that raise automotive fuel economy requirements and change the methods by which vehicle level fuel economy is measured drive the need for improved methods to measure component level parasitic loss. The intent of this standard is to provide the means to generate consistent component level parasitic loss data in support of modeling and analysis of vehicle-level emissions and fuel economy. This document is similar to SAE J2985, focusing however on the PTU instead of the transfer case.
Meta TagsDetails
DOI
https://doi.org/10.4271/J3039_202012
Pages
12
Citation
SAE International Recommended Practice, Definition and Measurement of Power Transfer Unit Speed-Dependent Parasitic Loss, SAE Standard J3039_202012, Issued December 2020, https://doi.org/10.4271/J3039_202012.
Additional Details
Publisher
Published
Dec 30, 2020
Product Code
J3039_202012
Content Type
Recommended Practice
Status
Issued
Language
English

Revisions