Techniques of Measurement, Variations and Effects of Vehicle Friction Losses on Electric Dynamometers Advanced Product and Manufacturing Engineering Staff, General Motors Corporation

Format:

Conference/Event

Author/Creator:

Wiers, Ward W., author.

Conference Name:

SAE International Congress & Exposition (1983-02-28 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1983

Summary:

Techniques were developed with the electric dynamometers to:Vehicle driveline and tire losses were measured on 33 similar front wheel drive vehicles equipped with the same tire size. The total losses averaged 6.2 HP at 50 MPH and ranged from 4.8 to 8.4 with a standard deviation of .75 HP. With the standard dynamometer load used for the FTP test with that vehicle, the ± .75 HP represents a 11% change in load and about a 5% effect on fuel economy. The difference between the maximum and minimum driveline and tire losses measured would result in a 27% change in load and an approximate 11% change in fuel economy. Tires accounted for the largest percentage of the total losses while the brake systems caused the greatest variations.Measurement of the vehicle losses and the ability to match the dynamometer to a desired load would allow testing all vehicles in a given program at the same load conditions. This would eliminate the effect of variations in losses when comparing the merits of various development designs and calibrations

Notes:

Vendor supplied data

Publisher Number:

830436

Access Restriction:

Restricted for use by site license