Reciprocating internal combustion engines - Limit values of emitted noise
1 Scope
This document specifies the sound power level limit values of emitted noise of 5 grades of reciprocating internal combustion engines.
This document is applicable to reciprocating internal combustion engines as defined in GB/T 21404 (hereinafter referred to as "engines" unless otherwise specified).
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 1859.1 Reciprocating internal combustion engines - Measurement of sound power level using sound pressure - Part 1: Engineering method
GB/T 1859.3 Reciprocating internal combustion engines - Measurement of sound power level using sound pressure - Part 3: Precision methods for hemi-anechoic rooms
GB/T 8170 Rules of rounding off for numerical values &expression and judgement of limiting values
GB/T 21404 Internal combustion engines - Determination and method for the measurement of engine power - General requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 1859.1, GB/T 1859.3 and GB/T 21404 and the following apply.
3.1
engine noise grade
grade classification according to noise levels of engines
3.2
engine noise grade 1; ENG1
engine with its sound power level measurements at all operating conditions less than or equal to its corresponding grade 1 sound power level limit
3.3
engine noise grade 2; ENG2
engine with its measured sound power level at all operating conditions less than or equal to its corresponding grade 2 sound power level limit, and the measured sound power level of at least one operating condition is greater than its corresponding grade 1 sound power level limit
3.4
engine noise grade 3; ENG3
engine with its measured sound power level at all operating conditions less than or equal to its corresponding grade 3 sound power level limit, and the measured sound power level of at least one operating condition is greater than its corresponding level 2 sound power level limit
3.5
engine noise grade 4; ENG4
engine with its measured sound power level at all operating conditions less than or equal to its corresponding grade 4 sound power level limit, and the measured sound power level of at least one operating condition is greater than its corresponding level 3 sound power level limit
3.6
engine noise grade 5; ENG5
engine with its measured sound power level for at least one operating condition greater than its corresponding grade 4 sound power level limit
4 Measurement method
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Measurement method
4.1 General
4.2 Acoustic processing of specific sound sources
4.3 Operating conditions
5 Noise limit values
5.1 Calculation of sound power level limit
5.2 Noise grade evaluation
6 Judgment method
7 Marking
Annex A (Information) Example of engine noise evaluation
