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1、 Reference number ISO 10521-2:2006(E) ISO 2006 INTERNATIONAL STANDARD ISO 10521-2 First edition 2006-10-01 Road vehicles Road load Part 2: Reproduction on chassis dynamometer Vhicules routiers Rsistance sur route Partie 2: Reproduction sur banc dynamomtrique Copyright International Organization for
2、Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 06:27:53 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 10521-2:2006(E) PDF disclaimer This PDF file may contain embedded typefaces. In acco
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4、icensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for prin
5、ting. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. ISO 2006 All rights reserved. Unless otherwise specified, no part of this
6、publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211
7、Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2006 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not f
8、or Resale, 04/19/2007 06:27:53 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 10521-2:2006(E) ISO 2006 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references. 1 3 Terms and definitions. 1 4 Required overall measurement accur
9、acy 2 5 Preparation for chassis-dynamometer test . 3 5.1 Setting parameter . 3 5.2 Laboratory condition 3 5.2.1 Roller 3 5.2.2 Room temperature 3 5.3 Preparation of chassis dynamometer. 3 5.3.1 Inertia-mass setting 3 5.3.2 Preconditioning of chassis dynamometer. 3 5.4 Vehicle preparation. 3 5.4.1 Ty
10、re-pressure adjustment 3 5.4.2 Vehicle setting. 4 5.4.3 Vehicle preconditioning. 4 6 Load setting on the chassis dynamometer 4 6.1 Chassis-dynamometer setting by coastdown method. 4 6.1.1 Load setting of chassis dynamometer. 4 6.2 Chassis-dynamometer setting using torquemeter method 5 6.2.1 Load set
11、ting of chassis dynamometer. 6 Annex A (normative) Calculation of road load for the dynamometer test . 8 Annex B (normative) Adjustment of chassis-dynamometer setting load 11 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Stand
12、ards 1/9972545001 Not for Resale, 04/19/2007 06:27:53 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 10521-2:2006(E) iv ISO 2006 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
13、 (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations,
14、governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/
15、IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the me
16、mber bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 10521-2 was prepared by Technical Committee ISO/TC 22, Road vehicles,
17、 Subcommittee SC 5, Engine tests. This first edition, together with ISO 10521-1, cancels and replaces ISO 10521:1992, which has been technically revised. ISO 10521 consists of the following parts, under the general title Road vehicles Road load: Part 1: Determination under reference atmospheric cond
18、itions Part 2: Reproduction on chassis dynamometer Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 06:27:53 MDTNo reproduction or networking permitted without license from IHS -,
19、-,- ISO 10521-2:2006(E) ISO 2006 All rights reserved v Introduction This part of ISO 10521 has been prepared to reflect the state-of-the-art technique for the vehicle road-load setting on chassis dynamometers. ISO10521-1 should be referred to for the basic road-load measurement method. This part con
20、tains the following technical and editorial changes compared with ISO 10521:1992: to simulate the road load on the chassis dynamometer precisely, the hydraulic absorber type dynamometer is excluded; only the chassis dynamometer of coefficient control is described in this part of ISO10521. Copyright
21、International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 06:27:53 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization
22、Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 06:27:53 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 10521-2:2006(E) ISO 2006 All rights reserved 1 Road vehicles Road load Part 2
23、: Reproduction on chassis dynamometer 1 Scope This part of ISO 10521 specifies methods of setting the target road load on chassis dynamometers for the purpose of a subsequent test, for example the fuel consumption test or the exhaust-emission measurement test. The road-load setting method on chassis
24、 dynamometers depends on the road-load measurement method, such as the coastdown method, the torquemeter method or the wind-tunnel and chassis-dynamometer method. This part of ISO 10521 gives detailed instructions on the methods of the chassis-dynamometer setting procedure for road-load value, obtai
25、ned by the various measurement methods specified in ISO 10521-1. This part of ISO 10521 is applicable to chassis dynamometers that can set road load at a minimum of three speed points, and to motor vehicles as defined in ISO 3833 up to a gross vehicle mass of 3 500 kg. 2 Normative references The fol
26、lowing referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3833, Road vehicles Types Terms and definitions ISO
27、10521-1:2006, Road vehicles Road load Part 1: Determination under reference atmospheric conditions 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 3833 and the following apply. 3.1 total resistance total force-resisting movement of a vehicle movement
28、, measured either by the coastdown method or by the wind-tunnel and chassis-dynamometer method, including the friction forces in the drive train 3.2 running resistance torque-resisting movement of a vehicle, measured by the torquemeter installed in the drive-train of a vehicle, including the frictio
29、n torque in the drive-train downstream of the torquemeter Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 06:27:53 MDTNo reproduction or networking permitted without license from
30、 IHS -,-,- ISO 10521-2:2006(E) 2 ISO 2006 All rights reserved 3.3 road load general meaning of force or torque which opposes the movement of a vehicle, including total resistance and/or running resistance 3.4 reference speed vehicle speed at which a chassis-dynamometer load is verified NOTE Referenc
31、e speeds may be continuous speed points covering the complete speed range. 3.5 target road load road load to be reproduced on the chassis dynamometer 3.6 chassis-dynamometer setting load load to be set on the power-absorption unit of the chassis dynamometer 3.7 simulated road load road load to be ca
32、lculated from measured coastdown data using the least-square regression NOTE See Annex A for the calculation procedure. 3.8 speed range range of speed of chassis-dynamometer roller between 15 km/h and maximum reference speed plus 10 km/h, over which the coastdown test is conducted 3.9 chassis dynamo
33、meter of coefficient control chassis dynamometer of which absorption characteristics are determined by giving coefficients of a road-load approximation polynomial 3.10 chassis dynamometer of polygonal control chassis dynamometer of which absorption characteristics are determined by giving load value
34、s at several speed points 4 Required overall measurement accuracy The required overall measurement accuracy shall be as follows: a) chassis-dynamometer roller speed: 0,5 km/h or 1 %, whichever is greater; b) chassis-dynamometer force: Category 1 chassis dynamometer: 6 N, or Category 2 chassis dynamo
35、meter: 10 N or 0,1 % of full scale, whichever is greater; NOTE Category 2 chassis dynamometer usually has greater load capacity, e.g. 130 kW or more. c) time: 50 ms or 0,1 %, whichever is greater; d) wheel torque: 3 Nm or 0,5 %, whichever is greater; Copyright International Organization for Standard
36、ization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 06:27:53 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 10521-2:2006(E) ISO 2006 All rights reserved 3 e) atmospheric temperature: 1 K; f) tyre pres
37、sure: 5 kPa. 5 Preparation for chassis-dynamometer test 5.1 Setting parameter The following parameters shall be determined prior to the test, in accordance with the purpose of the subsequent test: a) target road load; b) speed range; c) reference speed. 5.2 Laboratory condition 5.2.1 Roller The chas
38、sis-dynamometer roller shall be clean, dry and free from anything which might cause tyre slippage. In the case of chassis dynamometers with multiple rollers, the chassis dynamometers shall be run in the same coupled or uncoupled state as the subsequent emission test, fuel consumption test, etc., and
39、 the chassis- dynamometer speed shall be measured from the roller coupled to the power-absorption unit. 5.2.2 Room temperature The laboratory atmospheric temperature shall be within 293 K to 303 K as the standard condition, unless otherwise required by the subsequent test. 5.3 Preparation of chassis
40、 dynamometer 5.3.1 Inertia-mass setting Set the equivalent inertia mass of the chassis dynamometer in accordance with the vehicle mass or vehicle mass category. 5.3.2 Preconditioning of chassis dynamometer Precondition the chassis dynamometer in accordance with the dynamometer manufacturers recommen
41、dations, or as appropriate, so that the friction loss of the chassis dynamometer can be stabilized. 5.4 Vehicle preparation 5.4.1 Tyre-pressure adjustment The tyre pressure shall be adjusted to the recommended values for the test. These values shall correspond to those recommended for the range of v
42、ehicle speeds encountered during the subsequent emission test, fuel consumption test, etc., in conjunction with roller geometry of the chassis dynamometer to be used. If small- diameter roller(s) are being used, the tyre pressure may be increased so as to ensure a safe test. This pressure increase s
43、hould be typically 50 %. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/19/2007 06:27:53 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 10521-2:2006(E) 4
44、ISO 2006 All rights reserved 5.4.2 Vehicle setting The tested vehicle shall be installed on the chassis-dynamometer roller in a straight position and restrained in a safe manner. In the case of a single roller, the tyre contact point shall be within 25 mm or 2 % of the roller diameter, whichever is
45、smaller, from the top of the roller. 5.4.3 Vehicle preconditioning The power-absorption unit of the chassis dynamometer shall be set in the way specified in 6.1.1.1 or 6.2.1.1, so that an adequate load will be applied to the test vehicle during preconditioning. Prior to the test, the vehicle shall b
46、e preconditioned appropriately until normal vehicle operating temperatures have been reached. It is recommended that the vehicle should be driven at the most appropriate reference speed for a period of 30 min. During this preconditioning period, the vehicle speed shall not exceed the highest referen
47、ce speed. 6 Load setting on the chassis dynamometer 6.1 Chassis-dynamometer setting by coastdown method This method is applicable when the road load is determined using the coastdown method, or the wind-tunnel and chassis-dynamometer method as specified in ISO 10521-1:2006, 5.3, 5.4 or Clause 6. 6.1
48、.1 Load setting of chassis dynamometer 6.1.1.1 Initial load setting For a chassis dynamometer of coefficient control, the chassis-dynamometer power-absorption unit shall be adjusted with the arbitrary initial coefficients, Ad, Bd and Cd, of the following equation: 2 dddd FAB VC V=+ where Fd is the chassis-dynamometer setting load, in newtons (N); V is the speed of the chassis-dynamometer roller,