BS-6916-7-1998 ISO-7293-1997.pdf
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1、BRITISH STANDARD BS 6916-7: 1998 ISO 7293:1997 Chainsaws Part 7: Method of evaluating engine performance including fuel consumption ICS 65.060.80 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 13:16:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6916-7:1998 This British Standard, having be
2、en prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 March 1998 BSI 04-1999 ISBN 0 580 29657 1 National foreword This British Standard reproduces verbatim ISO 7293:1997 and implements it as the UK nation
3、al standard. It supersedes BS 6916-7:1988 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee AGE/29, Forestry machinery, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee an
4、y enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references T
5、he British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A
6、 British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a
7、 front cover, an inside front cover, pages i and ii, the ISO title page, page ii, pages 1 to 3 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued si
8、nce publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 13:16:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6916-7:1998 BSI 04-1999i Contents Page National forewordInside front cover Forewordii Introduction1 1Scope1 2Normative references1 3Apparatus1 4Test cond
9、itions1 5Conditions of measurement2 6Operating method2 7Test report2 Figure 1 Examples of characteristics curves3 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 13:16:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 13:16:12 GMT+00
10、:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 13:16:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6916-7:1998 ii BSI 04-1999 Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
11、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, govern
12、mental 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. Draft International Standards adopted by the technical committees are circulated to the
13、member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 7293 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and forestry, Subcommittee SC 17, Manually
14、portable forest machinery. This second edition cancels and replaces the first edition (ISO 7293:1983), of which it constitutes a technical revision (see Introduction). Descriptors: Agricultural machinery, forest equipment, portable equipment, mechanically-operated devices, saws, chain saws, propulsi
15、on engines, internal combustion engines, tests, performance tests, determination, fuel consumption. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 13:16:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6916-7:1998 BSI 04-19991 Introduction The first edition of ISO 7293 was elaborated from 19
16、79 to 1980 according to the special conditions of chain-saws at that time. Extensive measurement experiences not only at manufacturers but also at test stations revealed that the test procedure given in ISO 7293:1983 is no longer appropriate due to advanced developments. The test procedure given in
17、ISO 7293:1983 required an intermittent test run repeated over a specified range of rotational frequency. Within this range, one data print had to be recorded at every 10 s1 increment. The necessary reading had to be recorded within 50 s to 60 s after the application of full load. This sequence was t
18、hen followed by 1 min of running with idling. According to gathered experiences, this intermittent procedure has several disadvantages: the repeatability is poor due to the unstable test conditions: the temperature, and therefore the performance, is not steady within the defined time frame in which
19、the test data have to be recorded; some machines have problems during idling due to the coupled masses of the dynamometer; the measuring time is lengthened due to the additional idling modes. In the steady-state procedure given in this International Standard, the power curve is measured over the sam
20、e range of rotational frequency. After the torque and temperature have stabilized, all necessary data for the performance and the fuel consumption measurement have to be taken. After recording the data, the next point on the power curve has to be measured without returning to idling. Due to the clos
21、e temperature correlation from the previous point to the subsequent point, the stabilized conditions are reached in a much shorter time than in the previous procedure. 1 Scope This International Standard specifies a method for testing the performance and fuel consumption of internal combustion engin
22、es used to power portable chain-saws. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and
23、parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 5164:1990, Motor fuels Determination
24、 of knock characteristics Research method. 3 Apparatus 3.1 Brake power test bench with a torque accuracy of 2 % of the measured value. 3.2 Tachometer with an accuracy of 0,5 % of the measured value. 3.3 Fuel consumption measuring device with an accuracy of 3 % of the measured value. 3.4 Thermometer
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