SAE J2177-1992 CHASSIS DYNAMOMETER TEST PROCEDURE.HEAVY-DUTY ROAD VEHICLES.pdf
《SAE J2177-1992 CHASSIS DYNAMOMETER TEST PROCEDURE.HEAVY-DUTY ROAD VEHICLES.pdf》由会员分享,可在线阅读,更多相关《SAE J2177-1992 CHASSIS DYNAMOMETER TEST PROCEDURE.HEAVY-DUTY ROAD VEHICLES.pdf(17页珍藏版)》请在三一文库上搜索。
1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefr
2、om, is the sole responsibility of the user.” 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. QUESTIONS REGARDING THIS DOCUMENT: (724) 772-8512 FAX: (724) 776-0243 TO PLACE A DOCU
3、MENT ORDER; (724) 776-4970 FAX: (724) 776-0790 SAE WEB ADDRESS http:/www.sae.org Copyright 1992 Society of Automotive Engineers, Inc. All rights reserved.Printed in U.S.A. SURFACE VEHICLE 400 Commonwealth Drive, Warrendale, PA 15096-0001 RECOMMENDED PRACTICE Submitted for recognition as an American
4、National Standard J2177 ISSUED APR92 Issued1992-04 CHASSIS DYNAMOMETER TEST PROCEDUREHEAVY-DUTY ROAD VEHICLES ForewordThis Document has not changed other than to put it into the new SAE Technical Standards Board Format. The Definition Section was changed to Section 3. TABLE OF CONTENTS 1.Scope . 2 1
5、.1Field of Application 2 2References 2 2.1Applicable Publications. 2 3.Definitions 2 4.Test Equipment. 3 4.1Test Facility. 3 4.2Chassis Dynamometer. 4 4.3Instrumentation. 5 5.Test Procedure . 6 5.1Vehicle Preparation 6 5.2Operating Conditions 7 5.3Test Measurements 8 5.4Instrumentation and Equipment
6、 Removal 9 6.Data Correction 9 6.1Reference Test Conditions . 9 6.2Power Corrections 9 6.3Correction Factor Calculations . 9 7.Data Analysis . 13 7.1Additional Units and Symbols. 13 7.2Determination of Observed Wheel Power 13 7.3Calculation of Corrected Wheel Power. 13 7.4Calculation of Expected Whe
7、el Power 13 7.5Comparison of Corrected to Expected Wheel Power . 14 7.6Set Point Determination 14 SAE J2177 Issued APR92 -2- 7.7Vehicle Speed Calculation14 7.8Additional Diagnostic Considerations .15 8.Presentation of Results.15 8.1Recorded Test Data15 8.2Reported Test Information 16 1.ScopeThis SAE
8、 Recommended Practice has been adopted by SAE to specify: a.A standard procedure for chassis dynamometer testing of heavy-duty road vehicles for the purpose of determining power delivered through the drive tires. b.A method of correcting observed power to reference test conditions. c.A method of ana
9、lyzing the test data to determine if the test results are within expected power ranges. 1.1Field of ApplicationThis document is applicable to DOT Class 6, 7, and 8 on and on/off highway heavy-duty road vehicles equipped with compression ignition engines, manual or automatic transmissions, and single
10、 or tandem rear drive axles. 2.References 2.1Applicable PublicationsThe following publications form a part of the specification to the extent specified herein. Unless otherwise indicated the latest revision of SAE publications shall apply. All terminology, test procedures, reference conditions and c
11、orrection procedures are in accordance with SAE J1995 except where otherwise specified by this document. SAE J1587Joint SAE/TMC Electronic Data Interchange Between Microprocessor Systems in Heavy- Duty Vehicle Applications SAE J1708Serial Data Communications Between Microprocessor Systems in Heavy-D
12、uty Vehicle Applications SAE J1995Engine Power Test CodeSpark Ignition and Compression IgnitionGross Power Rating 3.DefinitionsThis section contains the definition of key terms used to describe the chassis dynamometer test procedure. 3.1Gross Brake PowerThe power of an engine when configured with on
13、ly the built-in equipment required for self-sustained operation in accordance with SAE J1995. This does not include accessory power as defined in 3.2. 3.2Accessory PowerPower required to drive engine or chassis components that are necessary to perform the intended service or that power auxiliary sys
14、tems. These components normally include the chassis inlet and exhaust systems, cooling fan, alternators/generators, vacuum pumps, power steering pumps, and air and freon compressors, operating as described in Sections 4 and 5. All engine or chassis parasitic power losses incurred during the chassis
15、dynamometer test that are not included in the gross brake power shall for the purpose of this procedure be considered accessory power. 3.3Flywheel PowerThe power of an engine as installed in the chassis and measured at the flywheel. Flywheel power is the net difference between gross brake power and
16、accessory power. 3.4Drive Train EfficiencyThe ratio of the sum total of the power delivered to all drive wheels to the flywheel power. This includes power losses generated by the transmission, driveshaft, carriers, and axles. It does not include tire rolling resistance losses. Drive train efficiency
17、 may vary with the speed of the vehicle as well as the amount of torque transmitted. It is normally supplied by the vehicle component manufacturer. SAE J2177 Issued APR92 -3- 3.5Rolling Resistance PowerThe power required to overcome the rolling resistance of all drive tires. This power normally vari
18、es with the type of tires, tread pattern, inflation pressure, vehicle weight on the drive tires, vehicle speed, and/or dynamometer roller surface. 3.6Tire-Roller Slip PowerThe net difference between the power delivered through the drive tires and that transmitted to the dynamometer rollers. This pow
19、er loss is due to tire to roller relative slip and is normally dissipated as heat. Tire-roller slip power can be significant and may vary with the type of tire, tread pattern, inflation pressure, roller surface, roller diameter, as well as the test speed and torque application. 3.7Observed Dynamomet
20、er PowerThe observed vehicle power with no corrections made as measured by the chassis dynamometer using the equipment and procedures defined in Sections 4 and 5. 3.8Dynamometer Machine LossesThe net difference between the power delivered to the dynamometer rollers and that measured by the dynamomet
21、er load cell. These include windage or bearing power losses as well as any unaccounted for load cell calibration error. 3.9Observed Wheel PowerThe observed dynamometer power adjusted only for dynamometer machine losses, if any. If these losses are not known and cannot be accounted for, then observed
22、 wheel power is assumed equivalent to observed dynamometer power. 3.10 Corrected Wheel PowerThe observed wheel power corrected to reference test conditions. 3.11 Expected Wheel PowerThe vehicle power that would normally be expected to be transmitted to the dynamometer if the test were run at referen
23、ce test conditions. This is calculated by subtracting estimated accessory, drive train, and rolling resistance power losses from the engine gross brake power. 3.12 Reference Test ConditionsThe standard or reference test conditions to which all power corrections are made per 6.1. These corrections ar
24、e made to reference engine inlet air and fuel conditions as well as to account for tire-roller slip. 3.13 Reference Test SpeedThe highest engine speed that can be attained in direct drive gear with the throttle fully depressed and the dynamometer rollers turning, but fully unloaded. At the reference
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- SAE J2177-1992 CHASSIS DYNAMOMETER TEST PROCEDURE.HEAVY-DUTY ROAD VEHICLES J2177 1992 PROCEDURE HEAVY
链接地址:https://www.31doc.com/p-3678349.html