Simulated Sensitivities of Auto Fuel Economy, Performance and Emissions U.S. Dept. of Transportation

Format:

Conference/Event

Author/Creator:

Malliaris, A. C., author.

Conference Name:

1976 Automotive Engineering Congress and Exposition (1976-02-23 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1976

Summary:

The subject is treated on the basis of detailed engineering test data regarding components and parameters of 1975 autos. The applicability of the simulation approach is examined by extensive comparisons with integrated vehicle test results. It is found that fuel economy, for the EPA driving schedules, is adequately simulated with 5% to 10% uncertainties. Uncertainties of the same magnitude are also encountered in performance simulations. Larger uncertainties are evident in the simulation of emissions. NOx prediction has an uncertainty up to 25% but no significant bias, while CO and HC are very substantially over-predicted and under-predicted respectively. Excepting HC and CO, several applications are made in the evaluation of sensitivities to various auto components and parameters. Evaluations are made of changes in auto weight, engine displacement and rear axle ratio, considered individually and in combinations. Drivetrain changes are also evaluated for three speed automatic transmissions. These include individually or in combinations: a wider range of gear ratios, the addition of a fourth gear and various schemes of torque converter lock-up

Notes:

Vendor supplied data

Publisher Number:

760157

Access Restriction:

Restricted for use by site license