Browse Topic: Overdrive transmissions
This SAE Standard incorporates driving cycles that produce fuel consumption data relating to Urban, Suburban, and Interstate driving patterns and is intended to be used to determine the relative fuel economy among vehicles and driving patterns under warmed-up conditions on test tracks, suitable roads, or chassis dynamometers.1
The main objective of this project was to compare the fuel consumption and dynamic performances of direct-drive and overdrive transmission tractors. Fuel consumption was evaluated at constant high speed and on various road profiles, while the dynamic performance was assessed on various road profiles only. The SAE Fuel Consumption Test Procedure (J1526) was used for constant high speed fuel consumption track test evaluations. The direct-drive transmission tractor consumed less than the overdrive transmission tractor, even though it was heavier. The testing on various road profiles was conducted using a towing dynamometer, for comparing the dynamic capability of the tractors when simulating the same towing load on two hilly road profiles: the Townes Pass path (in the Rocky Mountains) and the Saguenay path (in the Saguenay region of Quebec). Each tractor was to haul the set load along the given path while trying to attain 90 km/h speed. Results from the test showed almost identical
Heavy trucks increasingly employ lighter-weight materials and sleeker shapes-not just for body but major chassis components as well-to trim fuel consumption and emissions. It should come as no big surprise that the “heavy hitter” in boosting heavy-vehicle fuel efficiency is the hybrid powertrain, be it the electric or hydraulic variety. But, as many industry experts will tell you, hybridization does not benefit all medium- and heavy-duty vehicles equally. “There are technologies out there today and expected in the next five years that can help achieve what the president [Barack Obama] said was a 25% fuel-consumption reduction. That's his aim; I think it's achievable,” said Dr. Andrew Brown Jr., Executive Director and Chief Technologist for Delphi Corp. These technologies include hybrid powertrains, clean diesel technology, improved aerodynamics, low rolling resistance tires, and lightweight designs.
This SAE Standard incorporates driving cycles that produce fuel consumption data relating to Urban, Suburban, and Interstate driving patterns and is intended to be used to determine the relative fuel economy among vehicles and driving patterns under warmed-up conditions on test tracks, suitable roads, or chassis dynamometers.1
This SAE Standard incorporates driving cycles that produce fuel consumption data relating to Urban, Suburban, and Interstate driving patterns and is intended to be used to determine the relative fuel economy among vehicles and driving patterns under warmed-up conditions on test tracks, suitable roads, or chassis dynamometers.1 The urban driving cycle forms the basis of a Cold-Start Test Procedure described in SAE J1256.
Provide standard shift pattern guidelines for manual transmission shift controls in light, medium, and heavy trucks and buses.
The scope and purpose of this SAE Recommended Practice is to provide a standard pattern or sequence for the manual control of automatic transmissions in passenger cars and light-duty trucks.
This SAE Standard incorporates driving cycles that produce fuel consumption data relating to Urban, Suburban, and Interstate driving patterns and is intended to be used to determine the relative fuel economy among vehicles and driving patterns under warmed-up conditions on test tracks, suitable roads, or chassis dynamometers.1 The urban driving cycle forms the basis of a Cold-Start Test Procedure described in SAE J1256.
The scope and purpose of this SAE Recommended Practice is to provide a standard pattern or sequence for the manual control of automatic transmissions in passenger cars and light-duty trucks.
This procedure incorporates driving cycles that produce fuel consumption data relating to Urban, Suburban, and Interstate driving patterns and is intended to be used to determine the relative fuel economy among vehicles and driving patterns under warmed-up conditions on test tracks, suitable roads or chassis dynamometers.1 The urban driving cycle forms the basis of a Cold-Start Test Procedure described in SAE J1256.
This procedure incorporates driving cycles that produce fuel consumption data relating to Urban, Suburban, and Interstate driving patterns. The procedure is intended to be used to determine the relative fuel economy among vehicles and driving patterns under warmed-up conditions on a test track or on suitable roads. The urban driving cycle forms the basis of a Cold-Start Test Procedure described in SAE Recommended Practice SAE J1256.
This procedure incorporates driving cycles that produce fuel consumption data relating to Urban, Suburban, and Interstate driving patterns. The procedure is intended to be used to determine the relative fuel economy among vehicles and driving patterns under warmed-up conditions on a test track or on suitable roads.
Items per page:
50
1 – 19 of 19