GB/T 29125-2012 PDF English
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GB/T 29125-2012: Test methods for fuel consumption of CNG vehicles---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT29125-2012
GB
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.020
T 40
Test methods for fuel consumption of CNG vehicles
Issued on: DECEMBER 31, 2012
Implemented on: JULY 01, 2013
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Symbols, codes and abbreviations ... 7
5 Test conditions ... 9
6 Test equipment ... 9
7 Test items and test methods ... 11
8 Calculation method of fuel consumption ... 12
Appendix A (Normative) Compressed natural gas vehicle - Natural gas
flowmeter installation method... 17
Appendix B (Normative) Calculation method of natural gas density and calorific
value ... 21
Appendix C (Normative) Test results report ... 29
Appendix D (Informative) Compressed natural gas vehicle natural gas - liquid
fuel consumption conversion method ... 33
Foreword
This standard was drafted in accordance with the rules given in GB/T
1.1-2009.
This standard made reference to the technical information on the natural gas
consumption in the Regulation ECE R101-02 “Unified provisions on the
certification of the passenger vehicles installed with the internal combustion
engine only or hybrid power system based on the carbon dioxide emissions
and fuel consumption, AND the certification of the passenger vehicles installed
with hybrid power system and the pure electric motor type M1 and N1 based
on the power consumption and electric driving mileage” by the United Nations
Economic Commission for Europe (ECE) as effected in April 4, 2005.
This standard was proposed by the Ministry of Industry and Information
Technology of the People's Republic of China.
This standard shall be under the jurisdiction of the National Automotive
Standardization Technical Committee (SAC/TC 114).
The drafting organizations of this standard. China Automotive Technology
Research Center, Dongfeng Chaoyang Diesel Engine Co., Ltd., United
Automotive Electronics Co., Ltd. and Guangxi Yuchai Machinery Co., Ltd.
The main drafters of this standard. You Linhua, Liu Guibin, Cao Xiaofeng, Jia
Guiqi, Jia Yu, Li Yu, Ma Yue, Ma Jie, Ma Zonghua, Dai Chunbei, Liu Zhiwen,
He Zhaoxin.
Test methods for fuel consumption of CNG vehicles
1 Scope
This standard specifies the test method for the natural gas fuel consumption of
passenger vehicles and commercial vehicles using the compressed natural
gas (CNG) as fuel.
This standard is applicable to the natural gas fuel consumption test of the
passenger vehicles and commercial vehicles using the compressed natural
gas single gas fuel, AND it is also applicable to the natural gas fuel
consumption test of the passenger vehicles and commercial vehicles using
compressed natural gas dual purpose fuel.
The natural gas fuel consumption test for other types of vehicles equipped with
compressed natural gas single fuel engines or dual purpose fuel engines may
make reference to this standard.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this Standard.
GB/T 12534 Motor vehicles - General rules of road test method
GB/T 12545.1 Measurement methods of fuel consumption for automobiles -
Part 1. Measurement methods of fuel consumption for passenger cars
GB/T 12545.2 Commercial vehicle - Fuel consumption test method
GB/T 13610 Analysis of natural gas by gas chromatography
GB 17691 Limits and measurement methods for exhaust pollutants from
compression ignition and gas fueled positive ignition engines of vehicles (III,
IV, V)
GB 18047 Compressed natural gas as vehicle fuel
GB 18352.3 Limits and measurement methods for emission from light-duty
vehicles (III, IV)
GB/T 19233 Measurement methods of fuel consumption for light duty
vehicles
GB/T 20604-2006 Natural gas - Vocabulary
GB/T 22723 Energy determination for natural gas
GB/T 27840 Fuel consumption test methods for heavy-duty commercial
vehicles
QC/T 746 High-pressure pipelines for compressed natural vehicles
3 Terms and definitions
The terms and definitions as defined in GB/T 20604-2006 apply to this
document.
3.1
Natural gas; NG
It refers to the methane-based complex hydrocarbon mixtures, usually
containing ethane, propane and very small amounts of heavier
hydrocarbons, as well as a number of incombustible gases such as nitrogen
and carbon dioxide.
[GB/T 20604-2006, Definitions 2.1.1.1]
3.2
Dry natural gas
It refers to the natural gas for which the water vapor mole fraction is not
more than 0.005% [50 × 10-6 (mol)].
[GB/T 20604-2006, Definitions 2.1.1.9]
3.3
Combustion reference condition
It refers to the purely theoretical pressure and temperature conditions as
specified for natural gas combustion.
[GB/T 20604-2006, Definition 2.6.1.1]
Superior calorific value
It refers to, under the conditions that the pressure (p1) of the combustion
reaction is kept constant, all the combustion products other than water are
returned to the gaseous state at the same temperature (T1) as the reactant,
AND the water is condensed into a liquid having a temperature of T1, the
energy as released in the form of heat when a certain amount of fuel gas is
completely burned in the air.
[GB/T 20604-2006, Definition 2.6.4.1]
3.10
Inferior calorific value
It refers to, under the conditions that the pressure (p1) of the combustion
reaction is kept constant AND all the combustion products other than water
are returned to the gaseous state at the same temperature (T1) as the
reactant, the energy as released in the form of heat when a certain amount
of fuel gas is completely burned in the air.
[GB/T 20604-2006, Definition 2.6.4.2]
4 Symbols, codes and abbreviations
4.1 The symbols, codes and abbreviations in Table 1 apply to this standard.
Table 1 Symbols, codes and abbreviations
5 Test conditions
5.1 Road test conditions shall comply with the provisions of GB/T 12534.
5.2 When using the chassis dynamometer test or carbon balance method, the
light vehicle test conditions shall comply with the provisions of GB/T 19233 and
GB18352.3; AND the heavy-duty vehicle test conditions shall comply with the
provisions of GB/T 27840.
5.3 The natural gas fuel for the test of light vehicle and heavy vehicle shall
respectively complies with the requirements of GB18352.3 and GB17691, OR
the vehicle natural gas fuel complying with the provisions of GB 18047 may be
used, with its components, density and heat and other parameters being
known AND complying with the requirements of the automobile and engine
manufacturers.
5.4 Lubricants for test purposes shall comply with the requirements of the
enterprise AND shall be indicated in the test report.
6 Test equipment
6.1 Natural gas flowmeter
6.1.1 Allowable natural gas flowmeter type
6.1.1.1 Variable pressure mass flowmeter. an instrument using the Coriolis
principle (or similar principle) to measure the mass flow.
6.1.1.2 Constant pressure volume flowmeter. an instrument used to measure
the natural gas volume flow under certain test pressure (excluding the mass
flow meter for constant pressure measurement), AND the test pressure can be
adjusted and set by the regulator.
6.1.1.3 Low-pressure flowmeter. a fuel flowmeter for measurement in
low-pressure piping installed between the pressure regulator and the engine.
6.1.1.4 High-pressure flowmeter. a fuel flowmeter for measurement in
high-pressure piping installed between the compressed natural gas supply
device (including vehicle CNG cylinders, fixed type CNG gas supply equipment
and CNG storage cylinders, etc.) and the pressure regulator.
6.1.2 Natural gas flowmeter accuracy
Natural gas flowmeter accuracy shall be ± 0.5% of the measured value.
6.1.3 Installation of natural gas flowmeter
6.1.3.1 When using a high-pressure flowmeter for measurement, it shall install
a relief valve in the pipeline to release the air pressure from the pipeline before
disassembling the flowmeter.
6.1.3.2 The high-pressure flowmeter shall be connected using high-pressure
pipe.
6.1.3.3 For fixed pressure type high-pressure flowmeter, it shall install an
upstream pressure regulator; AND the outlet pressure of the regulator shall be
set at the specified value of the flowmeter.
6.1.3.4 When using the low-pressure flowmeter for measurement, it shall
install such devices as regulator box between the flowmeter and the engine, in
order to eliminate the fuel pressure pulsati...
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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