MOTOR VEHICLE POWER REQUIREMENTS ON HIGHWAY GRADES
IN ORDER TO GET UP TO DATE INFORMATION BEARING UPON THE EFFECTS OF HIGHWAY GRADES ON MOTOR VEHICLE OPERATING COSTS, SIX PASSENGER CARS AND TWO TRUCKS WERE USED IN A SERIES OF LABORATORY AND ROAD TESTS. IN THE LABORATORY, DYNAMOMETER TESTS WERE MADE ON THE ROLLING RESISTANCE, POWER, AND FUEL CONSUMPTION CHARACTERISTICS OF THE VEHICLES. THE ROAD TESTS COMPRISED: GASOLINE CONSUMPTION ON VARIOUS SURFACES; GASOLINE COMSUMPTION ON GRADES; FREE WHEELING TESTS; ROLLING, AIR AND ENGINE RESISTANCE; AND ACCELERATION AND TRACTIVE EFFORT. APPLICATION OF THE TEST DATA TO FOUR TYPICAL GRADE REDUCTION PROBLEMS BROUGHT OUT THESE INTERESTING RELATIONSHIPS: FOR PASSENGER CARS, OPERATING IN HIGH GEAR AT CONSTANT SPEED, THE SAVINGS IN FUEL COSTS RESULTING FROM REDUCING A 9-PERCENT GRADE TO A 6-PERCENT WERE TEN TIMES GREATER THAN IN REDUCING FROM 6 TO 3 PERCENT WHEN THE RISE AND FALL SHOULD CAUSE ONLY SLIGHT INCREASES IN FUEL COST. FOR GRADES LOWER THAN 9 PERCENT, THE TIME SAVING OBTAINED FROM GRADE REDUCTION IS NEGLIGILBLE FOR AUTOMOBILES BUT IS AN IMPORTANT FACTOR IN TRUCK OPERATION ON GRADES STEEPER THAN 3 PER CENT. /AUTHOR/
- Record URL:
-
Supplemental Notes:
- Vol 14, ParT I, PP 147-186, 25 FIG, 9 TAB. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
-
Authors:
- Moyer, R A
- Publication Date: 1935
Media Info
- Media Type: Digital/other
- Monograph Title: Proceedings of the Fourteenth Annual Meeting of the Highway Research Board Held at Washington, D.C. December 6-7, 1934. Part I
-
Serial:
- Highway Research Board Proceedings
- Volume: 14
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Dynamometers; Fuel consumption; Motor vehicles; Operating costs; Power; Rolling; Slopes; Specifications
- Uncontrolled Terms: Grades; Requirement
- Old TRIS Terms: Free wheeled vehicle; Resistance
- Subject Areas: Energy; Highways; Safety and Human Factors;
Filing Info
- Accession Number: 00223305
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Aug 15 1971 12:00AM