ISO 6855-1:2012 モペット—ガス状排気ガスと燃料消費量の測定方法—パート1：一般的なテスト要件 | ページ 2

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (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, 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/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 member 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 6855-1 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 23, Mopeds.

ISO 6855-1 cancels and replaces ISO 6855:1983 and ISO 7859:2000, both of which have been technically revised.

ISO 6855 consists of the following parts, under the general title Mopeds — Measurement method for gaseous exhaust emissions and fuel consumption:

• Part 1: General test requirements
• Part 2: Test cycles and specific test conditions
• Part 3: Fuel consumption measurement at a constant speed

Introduction

For measurement of moped fuel consumption, the carbon balance method ここで, the fuel consumption is calculated from analysis of the carbon quantity in the exhaust gas, is now widely used in addition to the conventional fuel flow measurement. Therefore, the measurement of exhaust gas and that of fuel consumption are inseparably related to each other.

ISO 6855 now covers in one single series of standards the two subjects that were previously covered separately by ISO 6855:1983 and by ISO 7859:2000. This part of ISO 6855 defines fundamental elements such as the measurement accuracy, test vehicle conditions and the details of the carbon balance method. Measurement of gaseous exhaust gas emissions and fuel consumption of test cycles can be conducted with this part of ISO 6855 and ISO 6855-2. Together with ISO 6855-3, they also give details of those measurements at a constant speed.

While the most up-to-date technologies are reflected in the ISO 6855 series, further technical development in the following aspects will be necessary in the future, when measurement of exhaust gas at a lower level is required:

• cleaning of the background air (i.e the air in the test room which is used for the dilution air);
• heating of the sampling line;
• control of the test room humidity;
• the exhaust gas analysis system for low-level emissions;
• consideration for the evaporated fuel from the test moped.

In addition to the above future issues, the chassis dynamometer with electrically simulated inertia is at the stage of practical application. Standardization of the verification method and the allowance of simulated inertia would be necessary for this recent development.

1 Scope

This part of ISO 6855 specifies the general test requirements for measurement for the gaseous exhaust emissions from mopeds, and for determining the fuel consumption of mopeds as defined in ISO 3833. It is applicable to mopeds equipped with a spark ignition engine (four-stroke engine, two-stroke engine or rotary piston engine).

2 Normative references

The following 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.

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 3833 and the following apply.

Bibliography