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1、CIA The Engineering Society For Advancing Mobility i Land Sea Air and Space Product of the e ooperative Engineering Program y- SAE J688 AUG87 Truck Ability Prediction Procedure SAE Recommended Practice Revised August 1987 Submitted for Recognition as an American National Standard SA J*b88 87 W 83573
2、LiO OOY21ib2 O W A No part of thls publlcalon may be reproduced in any form, In an alwtronlc retrieval system or otherwise, without the prior written pomi8slon of the publlsher. Copyright 1988 Society of Automotive Engineers, Inc. - O SAE J*b8B 7 m 8357340 0042363 2 m I 1 Land Sea Air ad Space Pl= I
3、ssued October 1951 Revised August 1987 I 400 COMMONWEALTH DRIVE, WARRENDALE, PA 15096 Submitted for recoanition as an American National Standard - I Superseding 5688 MAY58 TRUCK ABILITY PREDICTION PROCEDURE 1. INTRODUCTION : The procedure has been developed to provide a practical method for the pred
4、iction of truck performance using accepted data. anyone concerned with the problem of truck selection. By following directions, it is possible to deermine the necessary information for intel 1 igent truck selection without being concerned with the origin or derivation of the complex factors involved
5、. With readily available specifications of a truck, information provided in the tables, and a minimurn of calculation, it is possible to predict: It is designed to help (a) The performance obtainable from a truck of given characteristics under given operating conditions. (b) The characteristics requ
6、ired in a truck to meet different performance requirements under given operating conditions. Ed. This report comprises a procedure form and 1 0 tables of data. A complete explanation of the truck ability prediction procedure is contained in SAE Technical Report HS-82, Truck Abi1 ity-Prediction Proce
7、dure. Par 1 of HS-82 contains, in addition to the procedure form and tables, work sheets and an example. Part 2 demonstrates b y practical examples how to obtain some of the answers other than grade ability, and presents a detailed procedure for computing instantaneous acceleration and the time or d
8、istance required to accelerate between specified limits of speed. fundamental relations, and the formulas which form the basis for the procedure, a discussion of the reliability of factors and methods, and presents a method for evaluating the effect of wind on air resistance. Part 3 gives terminolog
9、y, the SAE reviews each technical report at least every five years at which time it may be reaffirmed,revised, or cancelled. SAE invites your written comments and suggestions. e SAETechnical Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering
10、sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” Copyright 1988 Society of Automotive Engineers, Inc. All rights reserved. Printed in U.S
11、.A. -,-,- SAE 5688 . Page 2 T ribeless Tiro Size 6 00-16 6.50-16 7-1705 7-17.5 7-22 o 5 7-22.5 8-17 o 5 8-17.5 8-19.5 8-19,5 8-22 5 8-22.5 9-22 e 5 9-22.5 10-22*5 10-22,s 11-22 e 5 11-22.5 11-24 a5 12,OQ-21 12 a 00-25 12-22.5 12-22 15 12-24 e 5 12-24 e 5 13.80-21 13 .ao-25 14 0610-21 14 o 00-24 TAEL
12、E 1 - Tire Factor Conventional Tire Size 6000-16 6.50-16 7.00-15, 7.00-16 7080-15, 7.00-16 6e50-20 6.50-20, 7.00-20 7.00-16, 7050-15 7.58-16 7.00-161 7.50-15 7. 50-16 7o00-17, 7.50-17 7.00-17, 7.50-17 7 e 50-20 7.5-20 8 25-20 8025-20 9.00-20 9.00-20 1 o. 90-20 10.00-20 10.00-22 12.00-20 12 00-24 11.
13、89-20 11.00-20 11.00-22 1 1 , 00-22 13 .00-20 13 JO-24 14.00-2 14 e 80-24 Ply Rating 6 6 6 8 6 8 6 8 6 8 8 10 10 12 10 12 12 14 12 14 14 12 14 12 14 16 16 16 16 168 Loaded Radius Tire Factor = Tire Factor 12 -40 11.85 11.75 11.75 10.15 10.15 11.45 11.45 10.50 10.50 9,50 9.50 9.20 9.20 8.80 8.80 8.55
14、 8.55 8.15 8.05 7.35 8 . 3 0 8.30 7.90 7.90 7.75 7.10 7.35 6.75 -,-,- SAE,J*b88 87 8357340 OOY2165 b = eaE - 0 3 Page 3 SA 5688 Altitude, f t O 1,000 2,000 3,000 4,000 5,000 6,000 7,000 Altitude Factor 1.00 0.96 0.92 0.88 O . 84 0.80 0 . 7 6 0.72 10. Grade deduction for road type and condition 11. N
15、et grade ability ab apparent road speed Altitude, f t (Road factor, Table 9 ) (Value 9 ) minus ivaiue 10) 8,000 9,000 10,000 11,000 12,000 13,000 14,000 15,000 12. Approximate acceleration rate on level at apparent road speed i n mpn per sec total gear reduction less than 10.0) Altitude Factor (0.2)
16、 X (Value II) O . 68 0.64 O . 60 0.56 O . 52 0 . 4 8 0 . 4 4 0.40 PRIXU)UE FORM FOR OETERHl%IhG GRADE ABILITY AT A CIVEti ROAD PEE0 A! EOUIVALEYT ACCEEWTION RATE Data Pertaining to Vehicle and Conditions of Operation i tem 1 . 2. 3. 4. 5. 6. lire size (driving wheels) . 7. , Altitude f t 9. Vehicle
17、identification Hake, mdel and type of vehicles) Vehicle overall maxim dimensions (a) Height f t (b) Width f t Total gmss weight in thusand l b . Hanufacturers maximum gross vehicle weight rating for power unit in pounds . Net engine power a t aea level (a) i- a t (b) wm engine speed Road surface typ
18、e and conditian Geer ratios (a! lransnission (b) Auxiliary transmission (c) Axle (d) Iota1 gear reduction PRCCEOUFE Procedure I value Steps 1 (Item 7b) (Item 5d) X ( T ; , E o r * ) I 1. Apparent road weed in wha Altitude factor, I; (item 7a) I ( Table 2 ) 2. Net engine tp corrected for altitude 4.
19、A i r resistance i- Area Factor Velocity factor,) x (A1;:;up;actorj 1 I ( laole 4 . ( Table 5 I 5. Chassis Friction tp I (Chassis factor, Table 7 ) . . I 6. Level road ip I Sun of values 3, 4 and 5 7. Reserve tpb I (Value 2) minus (Value 6 ) I E. Grade resistance ip per 1000 Ib weight I I aApparent
20、road speed can be attained under given connitions only if sufficient net tp is blf this value is neoative, the net b ia insufficient to attain apparent road speed. Torrect value using IaSle BA If 25% or above. available. -,-,- SAE J*b88 87 H 83573YO 00Y21bb 8 0.095 0.105 0.115 0.125 0.135 SAE 5688 0
21、.101 0,112 0.123 0.133 0.144 L.PE Page 4 - 0,145 0,155 0.165 0,175 0,185 0.195 Ilolllng 0.095 0.107 0,155 0.165 0.176 0.187 0.197 0.208 I 0.205 0,215 0.225 0.235 0,245 0.255 11 0,252 12 0.278 i3 O.Iu?r 14 0.331 15 O e X R 16 0.386 17 P . 4 1 4 18 0.441 20 O.M1 19 0,472 0.219 0.229 0.240 0.251 0.261
22、0.272 Maximum Vehicle b i g h t , ft 5 5-1/2 6 6-1/2 7 7-1/2 8 0 - m 9 9-1/2 10 1 Q 4 2 1 1 11-1/2 12 12-1/2 13 13-1/2 -Ci- i4 35 0.699 36 0.722 17 0 . 8 2 4 40 -. TAUE f - Rolling Frxtor 0.910 U.967 1.117 1.155 1.195 - aph - 41 42 45 44 45 46 47 49 49 59 Rolling factor 1.234 1.275 1.315 1.356 li198
23、 1 . 4 4 0 - 1.483 1.526 1.569 1.613 - - wh 51 52 53 54 55 56 57 50 59 60 - - Roflirlq - Rolling fastar 2.129 2.179 2.229 2 . 2 w 2.331 2.385 2.435 2.541 2.595 - 2.488 - W*ih 71 72 73 74 75 76 77 78 19 e!l - - TAKE 4 - Aree Factor Max Vehicle Width, ft I l I I 5-1/2 8 . 057 0063 0,070 80077 0.083 0.
24、090 0.097 8.103 8,110 0.123 0.138 0.137 8. 143 0.150 Q I 157 0.163 0,170 a. 117 0.062 O. 070 0.077 0.084 0.092 8,099 Oe 106 0,114 0.121 o. 128 0,136 0,143 0.150 0.158 0. 165 0,172 8,180 0.187 0.068 0.076 0.084 0,092 o. 100 0,108 O . 116 0.124 0.140 0.148 O e 156 0.132 0.074 0.082 0.091 o. 100 0. 108
25、 O. 117 0,126 0,134 0,143 0.152 o. 160 0.169 0.079 0.089 0,098 0,107 0.117 0,126 O . 135 O 145 o. l!A 8.163 0.173 Om 182 o. 164 0,178 0.191 0.172 I 0.186 I 0.201 o, 180 0 . 188 0,196 0.204 0.195 0.204 o, 212 0.221 0.210 0.219 0.229 0.238 7-1/2 I 8 0.085 I 0.091 factor 2.758 2.814 2.870 2.927 2.903 3
26、.041 3.039 3.157 I SAE 5688 SM Page 6 Hanufacturer E Hox Grosa Vehicle Weight Ratirir of Power a“, 20,080 - 22100Q 24,(363 26,006 iJiO 50 , O00 . - e m =_ 2 . 6 2.7 2.9 3 . 0 3 02 3 . 4 3 . 6 3 . 7 3 . 9 4 . 0 4 0 2 4 . 5 5. 1 5 . 5 5 . 0 6 . 1 6 s 0 7.4 8 . 2 9 . 0 1 0 . 6 4.8 - TABLE 7 - Chossis F
27、riction Hmsepowere - 1000 3 . 0 3 . 2 3 0 4 Is6 3.8 4 . 0 4 1 2 4 0 4 4 . 6 4 . 8 5 . o 5 . 4 5 . 8 6 . 2 . 7 , o 7 0 4 8.2 9 . 6 1 0 . o 11.0 1 3 . 0 - - - 1280 3 . 4 3 . 6 3.9 4 . 1 4 . 4 4 . 6 4 . 8 5 . O 5 . 3 5 . 5 5 . 8 6 . 3 6 . 8 7*2 7 . 7 8 . 2 8 . 7 9 . 6 1 8 . 6 1 1 . 8 1 3 . 0 1 5 . 4 -
28、- 1400 3 . 8 4 . 1 4 0 4 4 . 6 4 . 9 5 . 2 5 . 5 5 . 7 6 . O 6 . 3 6 . 6 7 . 1 7*7 8 . 2 8 . e 9 . 4 10.0 11.1 1 2 . 2 1 3 . 6 15.0 17a8 - - 16oa 4 0 2 4 . 5 4 . 8 5 s 1 5 . 5 5 . 8 6 . 1 6 . 4 6 . 8 7 . 1 7 . 4 8 . O 9 . 3 9.5 1 0 s 5 1 1 . 2 1 2 . 5 1 3 . 8 1 5 . 4 1 7 . 0 2 0 . 2 e . 7 - 7 1800 4
29、 . 6 4 . 9 5 . 3 5 . 6 6 . 0 6 . 4 6 . 8 7 . 1 7 . 5 7 . 8 8 . 2 8.9 4 s 6 1 0 . 3 1 1 . 1 1 2 . 5 1 3 . 9 1 5 . 4 1 7 . 2 1 9 . 0 2 2 . 6 - ti. a - Engine rpm - 2000 5 . 0 5 . 4 5.8 6 . 2 6 . 6 7.0 7 0 4 7.8 8 2 8 . 6 9 . O 9 . 8 10*6 1 1 . 4 12 2 1 3 . 0 1 3 . 8 1 5 . 4 1 7 . 0 1 9 . O 2 1 . 0 2 5
30、 . 0 - - - 2200 5 . 4 5 . 8 6 . 3 6 . 7 7 a 2 7 . 6 8.0 8 . 4 8.9 9 . 3 9 . 8 10s 7 1 1 . 6 1 2 . 4 14 s 2 1 5 . 1 1 6 . 8 1 8 . 6 2 0 . 8 23 . O 2 7 . 4 - 1 3 . 3 - fhoee voluoo ere tentative end apply only to rear wheel driven vehicles. - 2400 5 . 8 6 . 3 6 . 8 7 . 2 7 . 7 8 . 2 8 . 7 9 . 1 9, 6 1
31、0.1 1 0 . 6 11.5 1 2 . 5 1 3 . 4 16 *L 1 5 . 4 16 -4 2 0 . 2 2 2 . 6 2 5 . 0 29a8 - ia.3 - - 2600 6 . 2 6 . 7 7 . 2 7.7 8 . 3 8 . 8 9 . 3 9 . 8 1 0 . 4 1 0 . 9 1 1 . 4 1 2 . 4 1 3 . 5 14.5 is. 5 1 6 . 5 1 7 . 6 1 9 . 7 2 1 . 8 24 a 4 2 7 . 0 3 2 . 2 - - 2mo 6 . 6 i. 1 7 . 7 8 . 2 8 . 8 9 . 4 1 0 . 0
32、 1 0 . 6 1 1 . 1 1 1 . 6 1 2 . 2 1 3 . 2 14 e 4 15.5 1 6 . 7 18.9 21.2 2 3 . 4 2 6 . 2 2 9 . 0 3 4 . 6 - 1 7 . a - 3000 - 7 . 0 7 . 6 8 0 2 8 . 8 9 . 4 1 0 . o 1 0 . 6 1 1 . 2 1 1 . 8 12 . O 1 3 . 0 1 4 . 2 1 5 . 1 1 6 . 6 i7.0 1 9 . O 2 8 . 2 2 2 . 6 2 5 . 0 2 8 . o 3 1 . 0 3 7 . 0 - 3200 7 . 4 8 .
33、 O 8 . 7 9.3 1 0 . 0 1 0 . 6 1 1 . 2 1 1 . 8 1 2 . 5 13.1 1 3 . 8 1 5 . 1 1 6 . 4 1 7 . 6 in.9 2 0 . 2 2 1 . 5 2 4 . 0 - 2 6 . 6 2 9 . 8 3 3 . 0 3 9 . 4 - 34a0 7 . 8 8 . 5 9 . 2 9 . 8 1 0 . 5 1 1 . 2 1 1 . 9 1 2 . 5 13-2 1 3 . 9 - 1 4 . 6 1 5 . 9 1 7 . 3 1 8 . 6 2J.G 2 1 . 3 2 2 . 7 2 5 . 5 2 8 . 2
34、3 1 . 6 3 5 . 0 41.8 SAE 5688 i Page 7 * = “ , Grade Factor 1.78 1.70 1.63 1.56 1.50 1.44 1.39 1.34 1.29 1.25 1.21 1.17 1.14 1.10 1.07 1.04 1 . o1 O. 99 0.96 o. 94 i TABLE 8 - Grade Factor (use with correction Table 8A for grades over 20%) mph 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59
35、 60 - mPh - 1 2 3 4 5 6 7 8 9 10 1 1 12 13 14 15 16 17 18 19 20 - 0.91 o. 89 0.87 O. 85 0.83 o. 82 0.80 O. 78 0.77 o. 75 Grade Factor 37.50 18.75 12.50 9.38 7.50 6.25 5.36 4.68 4.17 3.75 3 e41 3.12 2.88 2.68 2.50 2.34 2.20 2.08 1.97 1.87 61 62 63 64 65 66 67 68 69 70 - BPh 21 22 23 24 25 26 27 28 29
36、 30 31 32 33 34 35 36 37 38 39 40 - - 73 74 75 0.51 O. 51 0.50 Grade Grade 76 77 78 79 80 0.49 0.49 0.48 0.47 0.47 0.74 II I 0.53 O . 72 O. 52 0.71 O . 69 0.68 O. 67 0.66 O. 65 0.64 O. 62 Grade factor = 3 7 . 5 mPh TABLE 8A - Correction for Values o f Grade Ability Above 20% 20 21 22 23 24- 25 26 27
37、 28 29 30 31 32 33 34 35 36 1 Computed Grade Ability Corrected Grade Ability 20.4 21.5 22,6 23.6 24.7 25.8 26.9 28.0 29.2 30.3 31.5 32.6 33.8 35. O 36.2 37.4 38.8 0.61 O. 60 0.60 O. 59 0.58 0.57 0.56 O . 55 0.54 o. 54 Computed Grade Ability 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 Correctec G
38、rade Ability 39.8 41.1 42 e4 43.6 45.0 46.3 47.6 49. O 50.4 51.8 53.2 54.7 56.2 57.7 59.3 60.9 -,-,- SAE J*b8B 87 83573qO OOr123i70 T L Factor I SAE 5688 11 -AC Page a - Bituminous macadam (low type) O i l mats (oiled macadam) Treated gravel Bituminous (tar) 0.2 0.6 1 . 0 . 0.5 111 Gravel Crushed st
39、one C obble si IV Earth 1.0 Sand TADLE 9 - Road Factor 1.0 1.5 1.5 2.5 I I I I Condition of Surface I Road Surface Type I Reed I Class I Cement concrete Brick Asphalt block Asphalt plant Granite block Skeet esphalt Aspheltic concrete Bituminous macadam (high type) Wood block 0.0 o. 1 0.2 I send ciav
40、 I -,-,- SAE J*bAA 87 m 8357340 0042171 1 m 5688 AUG87 RAT1 ONALE : Not applicable. RELATIONSHIP OF SAE STANDARD TO IS0 STANDARD: Not applicable. REFERENCE SECTION: SAE Technical Report HS-82, Truck Ab 1 ity Pred ction Procedure APPL I CATI ON : The procedure has been developed to provide a practica
41、l method for the prediction ?of truck performance using accepted data. concerned with the problem o f truck selection. It is designed to help anyone COMMITTEE COMPOSITION: DEVELOPED BY THE SAE TRANSPORTATION AND MAINTENANCE TECHNICAL COMMITTEE -,-,- . This report is published by SAE to advance tho stale of iechnical and engineering eciences.The US$ of this report is entirely voluntary, and ils applicability and auilabilily for any pariicular use, including any patent infnngemenl arising therefrom, is lhe so! responsibility o f the user. PRINTED IN U.S.A. -,-,-
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