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 entirelyvoluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefro
2、m, 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.TO PLACE A DOCUMENT ORDER: +01 724-776-4970 FAX: +01 724-776-0790SAE WEB ADDRESS http:/w
3、ww.sae.orgCopyright 2001 Society of Automotive Engineers, Inc.All rights reserved. Printed in U.S.A.SURFACEVEHICLE400 Commonwealth Drive, Warrendale, PA 15096-0001RECOMMENDEDPRACTICESubmitted for recognition as an American National StandardJ2548 ISSUEDAPR2001Issued 2001-04Test Method to Obtain Lug-U
4、p Torque Data for Heavy-Duty Truck and Bus Engines1. ScopeThis SAE Recommended Practice applies to all forms of diesel and natural gas engines fueled by thecombination of diesel fuel and natural gas.1.1 PurposeThis document provides a method to determine the torque generating capability of an engine
5、 as itaccelerates away from idle at a specified acceleration rate. The data is typically used to aid in the propermatching of the engine to the available torque converters of a torque converter equipped transmission. Thegoal is to achieve acceptable off-idle transient engine acceleration against the
6、 load of a torque converterequipped vehicle as it moves away from a stop.2. References2.1 Applicable PublicationThe following publication forms a part of this specification to the extent specifiedherein. Unless otherwise indicated, the latest issue of SAE publications shall apply.2.1.1 SAE PUBLICATI
7、ONAvailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.SAE J1995Engine Power Test CodeSpark Ignition and Compression IgnitionGross Power Rating3. ProcedureA dynamometer with automatic engine acceleration rate control is required. The test starts withthe engine idling against a typic
8、al curb idle torque load of a stopped vehicle equipped with a torque convertertransmission in gear. The throttle is then snapped open to wide open throttle. At the point that the throttle issnapped open, the dynamometer is to automatically control the rate of engine acceleration to 175 rpm/s. SAEJ19
9、95 gross torque versus engine rpm is then to be recorded until the engine approaches its high idle or noload rpm. It may be necessary to obtain the torque data via a driveline mounted torque meter between theengine and dynamometer in order to account for the torque required just to accelerate the in
10、ertia of thedynamometer.4. Data ReportingThe acceleration gross torque versus engine rpm data per this document is to bedocumented in writing for use by the industry.PREPARED BY THE SAE TRUCK AND BUS ENGINE PERFORMANCEAND APPLICATION SUBCOMMITTEE OF THESAE TRUCK AND BUS POWERTRAIN COMMITTEESAE J2548
11、 Issued APR2001RationaleNot applicable.Relationship of SAE Standard to ISO StandardNot applicable.ApplicationThis SAE Recommended Practice applies to all forms of diesel and natural gas engines fueledby the combination of diesel fuel and natural gas.Reference SectionSAE J1995Engine Power Test CodeSpark Ignition and Compression IgnitionGross Power RatingDeveloped by the SAE Truck and Bus Engine Performance and Application SubcommitteeSponsored by the SAE Truck and Bus Powertrain Committee
