ISO 8178-8:2015 レシプロ内燃エンジン—排気ガス測定—パート8：エンジングループの決定 | ページ 2

Foreword

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The committee responsible for this document is ISO/TC 70, Reciprocating internal combustion engines, Subcommittee SC 8, Exhaust emission measurement.

This second edition cancels and replaces the first edition (ISO 8178-8:1996), which has been technically revised.

ISO 8178 consists of the following parts, under the general title Reciprocating internal combustion engines — Exhaust emission measurement:

• Part 1: Test-bed measurement of gaseous and particulate exhaust emissions
• Part 2: Measurement of gaseous and particulate exhaust emissions under field conditions
• Part 3: Definitions and methods of measurement of exhaust gas smoke under steady-state conditions
• Part 4: Steady-state test cycles for different engine applications
• Part 5: Test fuels
• Part 6: Report of measuring results and test
• Part 7: Engine family determination
• Part 8: Engine group determination
• Part 9: Test cycles and test procedures for test bed measurement of exhaust gas smoke emissions from compression ignition engines operating under transient conditions
• Part 10: Test cycles and test procedures for field measurement of exhaust gas smoke emissions from compression ignition engines operating under transient conditions

Introduction

Unlike engines for on-road applications, engines for non-road use are made in a much wider range of power output and configuration and are used in a great number of different applications.

The objective of this International Standard is to rationalize the test methods for non-road engines in order to simplify and make more cost effective the drafting of legislation, the development of engine specifications, and the certification of engines to control gaseous and particulate emissions.

In order to achieve its objectives, this International Standard embraces four concepts that are the following:

• a) grouping of engine applications in order to reduce the number of test cycles as defined in ISO 8178-4;
• b) use of observed brake power as defined in ISO 8178-4 as the basis for the expression of specific emission levels;
• c) incorporation of an “engine family” concept in which engines with similar emission characteristics and design can be represented by an engine within the family;
• d) incorporation of an “engine group” concept which assumes that
  • 1) engines can be adjusted or modified after measurement on the test bed,
  • 2) engines of basically the same type or model can be classified within a group even if the engine is adjusted or modified after measurement on the test bed, and
  • 3) adjusted or modified engines must comply with the applicable emission limits.

1 Scope

This part of ISO 8178 specifies the parameters to be applied for the determination of which engine specifications can be included in an engine group and for the selection of the parent engine of the group.

It can be applied for applications that might require modification or adjustment to suit at-site operating conditions. Such applications include stationary engines and engines for shipping.

2 Terms and definitions

For the purposes of this document, the following terms and definitions apply.