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 ther
2、efrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2015 SAE International All rights reserved. No part of this
3、publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-49
4、70 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/J2723_201509 SURFACE VEHICLE STANDARD J2723 SEP2015 Issued 2005-04 Revised 2015-
5、09 Superseding J2723 AUG2007 Engine Power Test Code - Engine Power and Torque Certification RATIONALE SAE J2723 provides a means for certifying naturally-aspirated engines in multiple applications using “isopower charts“ to show the effect of intake restriction and exhaust backpressure. The sharp ri
6、se in the use of turbocharged engines has made it highly desirable to have a similar isopower option available for manufacturers who wish to certify boosted engines. TABLE OF CONTENTS 1. SCOPE . 2 1.1 Purpose of Standard 2 1.2 Field of Application . 2 2. REFERENCES . 2 2.1 Applicable Documents . 2 3
7、. TERMS AND DEFINITIONS 3 3.1 Certified Brake Power and Torque . 3 4. SELECTION, DOCUMENTATION AND VERIFICATION OF TEST ARTICLE . 3 5. WITNESS TESTING 3 5.1 Definition 3 5.2 Qualifications of Witness 3 5.3 Responsibility of Witness . 4 6. MANUFACTURERS RESPONSIBILITIES FOR CERTIFICATION 4 6.1 Test A
8、rticle . 4 6.2 Manufacturers Statement 4 7. SAE RESPONSIBILITY . 5 7.1 Review of Certification Data . 5 7.2 Maintaining of Data Repository 5 8. OPTIONAL METHOD FOR MANUFACTURERS TO CERTIFY NATURALLY-ASPIRATED ENGINES FOR APPLICATIONS WITH VARYING BACKPRESSURE AND INDUCTION RESTRICTION . 5 9. OPTIONA
9、L METHOD FOR MANUFACTURERS TO CERTIFY BOOSTED ENGINES FOR APPLICATIONS WITH VARYING BACKPRESSURE, INDUCTION RESTRICTION, AND / OR CHARGE AIR COOLER EFFECTIVENESS / MANIFOLD CHARGE TEMPERATURE . 6 9.1 Definition of the Hardware 7 SAE INTERNATIONAL J2723 SEP2015 Page 2 of 14 10. AMENDMENTS TO CERTIFIC
10、ATION . 8 11. NOTES . 14 11.1 Revision Indicator . Error! Bookmark not defined. FIGURE 1 SAMPLE ISOPOWER PLOT . 6 FIGURE 2 SAMPLE ISOPOWER PLOT FOR BOOSTED APPLICATION . 8 1. SCOPE This document specifies the procedure to be used for a manufacturer to certify the net power and torque rating of a pro
11、duction engine according to SAE J1349 (Rev. 8/04) or the gross engine power of a production engine according to SAE J1995. Manufacturers who advertise their engine power and torque ratings as Certified to SAE J1349 or SAE J1995 shall follow this procedure. Certification of engine power and torque to
12、 SAE J1349 or SAE J1995 is voluntary, however, this power certification process is mandatory for those advertising power ratings as “Certified to SAE J1349” or “Certified to SAE J1995.” In the event that an engine made by one manufacturer is sold to a consumer in a vehicle produced by a second manuf
13、acturer, engine certification may be completed by either manufacturer or by both manufacturers working together. An example of the latter would be the completion of witness testing by the engine manufacturer with the submission of certification documents by the vehicle manufacturer. 1.1 Purpose of S
14、tandard This SAE Standard has been written to provide manufacturers with a method of certifying the power of engines to SAE J1349 or SAE J1995. 1.2 Field of Application This certification process is applicable to all engines tested under SAE J1349 or SAE J1995. 2. REFERENCES 2.1 Applicable Documents
15、 The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. 2.1.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (i
16、nside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. SAE J1349 Engine Power Test Code - Spark Ignition and Compression Ignition - As Installed Net Power Rating SAE J1995 Engine Power Test Code - Spark Ignition and Compression Ignition - Gross Power and Torque Rating SAE INTERNATIONAL J2
17、723 SEP2015 Page 3 of 14 3. TERMS AND DEFINITIONS This section contains the definitions of key terms used to describe the net power and torque test. 3.1 Certified Brake Power and Torque The power and torque which a manufacturer certifies an engine will develop when tested under the conditions as spe
18、cified in SAE J1349 or SAE J1995. 4. SELECTION, DOCUMENTATION AND VERIFICATION OF TEST ARTICLE The engine to be tested shall be selected by the manufacturer as representative of the engine in the application being certified. It is preferable to test engines from regular series production. Engines bu
19、ilt from production-intent parts with production-intent processes and tooling may be used in the testing provided that all components conform to production intent design and comply with the requirements of the applicable standard (SAE J1349 or SAE J1995). It is the intent of this process that the le
20、vel of hardware and calibration compliance to production specifications will be that which is required for US EPA Emissions Certification. 5. WITNESS TESTING 5.1 Definition Witness testing is defined to mean testing in an appropriate facility that is witnessed by a qualified witness, independent of
21、the engine manufacturer, who is able to verify equipment function and calibrations, computations, and engine test settings as specified in the applicable standard. Testing for conformance to this standard may be done in the manufacturers facility or in any qualified independent facility conforming t
22、o ISO 9000/9002. Qualification is established by the ability to meet the requirements for testing according to SAE J1349 or SAE J1995. 5.2 Qualifications of Witness Witnesses for engine power and torque certification testing shall be registered with SAE. Witnesses shall be competent engineers who ar
23、e experienced in engine testing and familiar with the requirements of the SAE J1349 and SAE J1995 standards. Witnesses registered by SAE shall meet one of the following criteria: 5.2.1 Prior registration as a witness for European homologation testing and a signed statement acknowledging that the ind
24、ividual has studied and understands the SAE procedures. 5.2.2 Documented and verified experience in engine testing with three recommendations from individuals who are registered witnesses themselves or whose technical training and experience establish them as competent to evaluate the individuals sk
25、ills as a witness. In addition, a signed statement is required acknowledging that the individual to be registered has studied and understands the SAE J1349 and SAE J1995 testing procedures. 5.2.3 A Bachelors Degree in Engineering or equivalent plus 5 years of related engine testing experience and co
26、mpletion of an SAE-approved training course. Documented participation as an “apprentice witness” in at least three (3) SAE J1349 or SAE J1995 test procedures conducted by an SAE-certified witness who attests to the competency of that individual to conduct witness tests may be substituted for complet
27、ion of an SAE-approved training course. 5.2.4 Other qualified individuals who are identified and appointed by the SAE Engine Power Test Code Committee. The witness will provide a signed statement acknowledging that the individual has studied and understands the relevant SAE test procedures. SAE INTE
28、RNATIONAL J2723 SEP2015 Page 4 of 14 5.3 Responsibility of Witness 5.3.1 Confirm that the laboratory doing the testing is capable of meeting the requirements for SAE J1349 or SAE J1995 and that the calibration of measurement devices is in accordance with ISO 9000/9002. If the facility is ISO certifi
29、ed to ISO 9000/9002, the witness shall attach a valid certificate of compliance to the test results. If testing is done in a facility which is not ISO certified, the witness shall provide documentation to establish the capability of the laboratory to conduct testing as specified in the appropriate s
30、tandard. 5.3.2 Verify that the engine tested is consistent with that described in the manufacturers submission. 5.3.3 Verify that the engine induction and exhaust system are those for the application being evaluated or, if applicable, verify that the exhaust backpressure is set appropriately. 5.3.4
31、If applicable, review data on vehicle transient testing to ensure that engine settings for dynamometer testing are correct. The data required for this shall include identification of the vehicle from which test data were obtained and the transient test data determined using the procedure in SAE J134
32、9. These data shall include: engine control settings, temperatures, intake manifold pressure and exhaust back pressure as functions of time and vehicle speed. 5.3.5 Verify that fuel, coolant and lubricants used in testing are consistent with the manufacturers specification for the application being
33、rated. 5.3.6 The witness shall verify by appropriate means that critical measurements required for engine power and torque measurement are accurate. This may include testing of instrumentation. 5.3.7 Verify calculations by checking the output of the calculations with a test data set and by processin
34、g raw data from a test condition independently. 5.3.8 Verify that all control settings and test cell conditions are within the tolerance specified by the applicable standard. 5.3.9 Verify that the instrumentation is appropriately installed and that the signals from the instrumentation are accurately
35、 recorded and entered into the calculations. 5.3.10 Witness completion of the SAE J1349 or SAE J1995 Engine Power and Torque test procedure. 6. MANUFACTURERS RESPONSIBILITIES FOR CERTIFICATION A manufacturer wishing to certify an engine shall provide the following: 6.1 Test Article The manufacturer
36、shall provide an engine that is representative of the production engines being certified. 6.2 Manufacturers Statement The manufacturer shall supply documentation to SAE that includes the information listed in the following sections. 6.2.1 Engine Description All measurements and descriptions as liste
37、d in the appropriate standard Induction and exhaust system part name and part number list Listing of oil, fuel and coolant used with appropriate specifications Completed Form J2723 A. Engine Content Description ECU part number with software and calibration identifier/version Engine build phase SAE I
38、NTERNATIONAL J2723 SEP2015 Page 5 of 14 6.2.2 Declaration of Power and Torque The manufacturer shall report the declared power, declared torque and the respective speeds at which those values are achieved. The power and torque shall be designated as net (SAE J1349) or gross (SAE J1995). The declared
39、 values are those values that the manufacturer can use as “SAE Certified” in their product advertising and sales literature. The measured values of torque and power must be at least 99% of the declared values to be certified. 6.2.3 Test results as documented in SAE J1349 or SAE J1995. 6.2.4 Certific
40、ation Statement The manufacturer shall complete and submit form SAE J2723B as the actual certification document. 6.2.5 Production Variation Engines certified under this standard are subject to normal production variation. It is expected that most engines, when fully friction stabilized and tested in
41、 accordance with SAE J1349 or SAE J1995 will produce power and torque values that are at least 98% of their certified values. 7. SAE RESPONSIBILITY 7.1 Review of Certification Data SAE shall do the following prior to adding an engine to its listing of Certified Power and Torque: a. Review all docume
42、ntation to establish: 1. The engine description documentation is complete. 2. The witness for engine testing was an SAE-qualified witness. 3. The test data submitted are complete as required by SAE J1349 or SAE J1995. 4. The manufacturer has completed and an authorized representative has signed the
43、certification statement. 7.2 Maintaining of Data Repository SAE shall maintain a database of the certification data submitted by the manufacturers. 8. OPTIONAL METHOD FOR MANUFACTURERS TO CERTIFY NATURALLY-ASPIRATED ENGINES FOR APPLICATIONS WITH VARYING BACKPRESSURE AND INDUCTION RESTRICTION A manuf
44、acturer may elect to test only one engine in order to certify multiple power ratings of a base engine configuration where the only differences among the ratings result from changes in restriction of the induction system ahead of the throttle and/or exhaust restriction after the exhaust manifold. The
45、 architecture of the induction and exhaust systems and manifolds of the different applications must be sufficiently similar that there are not any tuning differences among them. Use of this procedure requires that the engine calibration provide equivalent combustion timing and fueling for applicatio
46、ns rated. Equivalence for combustion timing and fueling is to be interpreted as allowing slight alterations due to the intake and exhaust restrictions but not allowing changes in air-fuel ratio or combustion timing which would degrade power beyond the effects of the intake and exhaust restrictions.
47、When it is desired to certify an engine with multiple ratings, the manufacturer shall provide a chart similar to Figure 1 showing the power of the engine as a function of intake restriction and exhaust back pressure. The “base value” for this chart shall be defined by the intake and exhaust restrict
48、ion values determined using procedure SAE J1349. The witness shall verify the power determined for the “base value” and may require additional test points to verify the accuracy of the chart. SAE INTERNATIONAL J2723 SEP2015 Page 6 of 14 Charts such as Figure 1 may also be used for engine torque rati
49、ngs. In this case, it is understood that some minor variation may occur in the speed at which peak torque is achieved. When a single engine is rated at multiple torque levels through this method, the torque ratings shall be those corresponding to the torque at the rated speed of the base application. Alternatively, a manufacturer may elect to provide tabular data for multiple power and torque ratings of the same engine. The
