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 there
2、from, 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 2014 SAE International All rights reserved. No part of this p
3、ublication 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: +1 724-776-497
4、0 (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/J2542_201404 SURFACE VEHICLE STANDARD J2542 APR2014 Issued 2001-05 Revised 2014-0
5、4 Superseding J2542 NOV2007 Self-Propelled Sweepers and Scrubbers Fuel Consumption of Non-Propulsion Auxiliary Engines RATIONALE The document has been revised to update the referenced documents. 1. SCOPE This SAE Standard applies to the fuel consumption of non-propulsion engines used to drive exclus
6、ively the sweeping and cleaning functions of multi-engine sweepers and scrubbers as defined in SAE J2130-1 and SAE J2130-2. 1.1 Purpose The purpose of this document is to derive a uniform expression of fuel consumption from a simulated test cycle. The derived expression is based on various work situ
7、ations encountered during a typical daily eight-hour period of operation. The derived fuel consumption may be used to assess the sizing of fuel tanks. 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this specification to the extent specified herein. Unless otherwise
8、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 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. SAE J2130-1 Identification of Self-Propelled
9、Sweepers and Cleaning Equipment Part 1 Machines with a Gross Vehicle Mass Greater than 5000 kg SAE J2130-2 Identification of Self-Propelled Sweepers and Cleaning Equipment Part 2 Machines with a Gross Vehicle Mass up to 5000 kg SAE J1702 Self-Propelled Sweepers Sweep-Ability Performance SAE INTERNAT
10、IONAL J2542 Revised APR2014 Page 2 of 6 3. DEFINITIONS 3.1 AUXILIARY ENGINE An engine used to power a secondary function of the vehicle, usually to power exclusively the sweeping and or scrubbing systems. 3.2 NORMAL DAY A time-based operational period where the auxiliary engine operates under variab
11、le conditions of power and speed over an eight-hour period representing a normal days operation. 3.3 SIMULATED TEST CYCLE A reduced time based operational period of sufficient duration, during which fuel consumption test measurements shall be obtained in order to compute the fuel consumption for the
12、 normal days operational period. 3.4 FUEL CONSUMPTION The quantity of fuel consumed by an engine over a period of time under set duty cycle conditions. 3.5 FUEL Fuel shall be of the liquid variety and of the quality recommended for the machine under test. Gaseous fuels are not considered within the
13、scope of this standard. 3.6 FUEL CONSUMPTION MEASURING DEVICE Accuracy requirement shall be 3% of the measured value. 4. SYMBOLS The symbols used in this standard are given in Table 1. TABLE 1 - SYMBOL Symbol Definition Unit h Time hours h min Time minutes min kW Power kW V Volume of fuel consumed (
14、normal day) liter V1Volume of fuel consumed (during test STCa) liter V2Volume of fuel consumed (during test STCb) liter V3Volume of fuel consumed (during test STCc) liter SAE INTERNATIONAL J2542 Revised APR2014 Page 3 of 6 5. NORMAL DAY AND TEST CYCLES The normal day cycle is typically composed of p
15、eriods of activity with differing modes of operation. Running the engine at idle speed is permitted during the work periods, during the machine preparation and when performing clean-down tasks in the normal day cycle., There are other times when the engine is dormant, for example; during a pre-work
16、inspection or prior to preparing for work. In the operational periods when the engine is running, it may be running at preset speeds during which the engine load will vary according to power requirement. It could be difficult to mathematically compute the duty under these varying conditions. To assi
17、st with the calculation, the empirical analysis, given in Table 2 has been found to be typical of an average eight-hour operational period. Table 3 presents a 30 minute simulated test cycle of the normal day that is used for tests in order to compute the uniform expression of fuel consumption. Machi
18、nes may be equipped with variable or fixed engine speed control devices. TABLE 2 - NORMAL DAY (EIGHT HOUR) DUTY CYCLE Duty Cycle Time 1 Machine preparation for work (engine dormant) 0.5 h 2 Transit periods (engine dormant) 1.5 h 3 Work period (engine - idle) 0.5 h 4 Work period (low power - sweeping
19、/scrubbing) 2.0 h 5 Work period (high power - sweeping/scrubbing) 3.0 h 6 Clean-down (engine dormant) 0.5 h Total 8.0 h TABLE 3 - SIMULATED TEST CYCLE (STC) Test Test Cycle Condition Time STCaWork period - (engine - idle”) 10 min STCbWork period - (low power - sweeping/scrubbing) 10 min STCcWork per
20、iod - (high power - sweeping/scrubbing) 10 min Total 30 min 6. TEST PROCEDURE The engine shall be equipped for tests with a fuel measuring device. A graduated reservoir type, it should be of adequate volume to perform the test. Prior to tests, the machine shall be inspected to make sure that the eng
21、ine is operational according to the manufacturers advertised requirements. Settings for the machine shall be according to the normal set-up declared in the instruction manuals. The machine and engine shall be at normal operating temperature prior to tests. Tests shall also be conducted in weather co
22、nditions in the range 15 C to 27 C ambient. SAE INTERNATIONAL J2542 Revised APR2014 Page 4 of 6 The simulated test cycle is of 30 minutes duration and is comprised of three periods of operation of 10 minutes each. The first test period, STCa, is with the engine running at normal idle speed. The seco
23、nd test period, STCb, is at the recommended lowest speed or set condition for the sweeping/scrubbing operation, and the third test period, STCc, is the highest engine speed or set condition. The volume of fuel used (V1, V2and V3) in each test shall be measured in liters. During the test STCa, the sw
24、eeping/scrubbing functions shall be inert. In tests STCband STCc, all sweeping/scrubbing functions shall be active and working in normal conditions except for optional equipment. If optional equipment is functional, then details shall be recorded in the fuel consumption declaration. Fuel consumption
25、 tests may be simultaneously conducted during the course of sweepability trials as described in SAE J1702 in order to substantiate normal sweeping conditions. An estimation of engine power output may also be recorded during each of the three tests and recorded in the declaration. 7. CALCULATION In o
26、rder to formulate the predicted fuel consumption for the normal day duty cycle, Equation 1 shall be employed to calculate the value from the data collated in the simulated test cycle Normal daily fuel consumption; (Eq. 1) where V1= Volume of fuel consumed during test STCaV2= Volume of fuel consumed
27、during test STCbV3= Volume of fuel consumed during test STCc8. FUEL CONSUMPTION DECLARATION The derived fuel consumption may be presented in the format shown in Figure 1. VV13u V212u V318u +=SAE INTERNATIONAL J2542 Revised APR2014 Page 5 of 6 FIGURE 1 - SELF-PROPELLED SWEEPERS AND SCRUBBERS FUEL CON
28、SUMPTION FORMAT SAE INTERNATIONAL J2542 Revised APR2014 Page 6 of 6 9. NOTES 9.1 Marginal Indicia A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document.
29、An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. PREPARED BY THE MTC2, SWEEPER, CLEANER, AND MACHINERY COMMITTEE
