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HJ 857-2017: Measurement method and technical specification for PEMS test of exhaust pollutants from heavy-duty diesel and gas fuelled vehicles
HJ 857-2017
NATIONAL ENVIRONMENTAL PROTECTION STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
Measurement method and technical specification for PEMS
test of exhaust pollutants from heavy-duty diesel and gas
fuelled vehicles
ISSUED ON: SEPTEMBER 19, 2017
IMPLEMENTED ON: OCTOBER 01, 2017
Issued by: Ministry of Environmental Protection of PRC
Table of Contents
Foreword ... 3 
1 Scope of application ... 4 
2 Normative references ... 4 
3 Terms and definitions... 5 
4 Technical requirements and tests ... 6 
5 Emission compliance inspection of new production vehicles and in-use compliance
inspection ... 7 
6 Implementation of the standard ... 9 
Annex A (normative) Vehicle emission test report requirements ... 10 
Annex B (normative) PEMS measurement method for actual road emissions of heavy-
duty vehicles ... 17 
Measurement method and technical specification for PEMS
test of exhaust pollutants from heavy-duty diesel and gas
fuelled vehicles
1 Scope of application
This Standard specifies PEMS measurement method and technical specification for
exhaust pollutants from heavy-duty diesel and gas fuelled vehicles. It is applicable to
emission compliance inspection and in-use compliance inspection of new production
vehicles of heavy-duty diesel vehicles and gas-fueled vehicles that meet stage 5 of GB
17691-2005.
This Standard is applicable to measurement of exhaust pollutants from M2, M3, N2 (but
excluding low-speed goods vehicles) and N3 vehicles that are equipped with
compression ignition, gas fuel ignition engines with a design speed of more than
25km/h, as well as M1 vehicles that a total mass is greater than 3500kg.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For undated references, the latest edition of the referenced
document applies.
GB/T 12534, Motor vehicles - General rules of road test method
GB/T 15089-2001, Classification of power-driven vehicles and trailers
GB 17691-2005, Limits and measurement methods for exhaust pollutants from
compression ignition and gas fuelled positive ignition engines of vehicles (III IV V)
GB 18352.6-2016, Limits and measurement methods for emissions from light-duty
vehicles (CHINA 6)
HJ 437-2008, Technical specification for on-board diagnostic (OBD)system of
compression ignition and gas fuelled positive ignition engines of vehicles
HJ 438-2008, Durability of Emission Control Systems of Compression Ignition and
Gas Fuelled Positive Ignition Engines of Vehicles
HJ 689-2014, Limits and Measurement Methods for Exhaust Pollutants from Diesel
Engines of Urban Vehicles (WHTC)
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB 17691-2005
and HJ 689-2014 as well as the followings apply.
3.1 portable emissions measurement system PEMS
a complete set of emission testing systems, that can be installed in the vehicle, that can
simultaneously measure exhaust flow, pollutant concentration, ambient temperature,
humidity, atmospheric pressure, and that can conduct real-time measurement or
collection of related parameters such as engine speed, torque, load, vehicle speed,
latitude, longitude, and altitude.
3.2 PEMS method
a method that installs the portable emission measurement system on the testing vehicle,
so as to measure the exhaust pollutant emissions when the vehicle is driving on the
actual road.
3.3 transient cycle
the transient cycle (ETC or WHTC) used when type inspection is carried out for the
engine according to GB 17691-2005 or HJ 689-2014.
3.4 work-based window
a continuous interval from the trial termination point to the cutoff point; when the
cumulative work in the interval is equal to the engine work in the transient cycle, the
continuous interval is defined as a work-based window.
3.5 window brake-specific emissions
the ratio of the total mass of vehicle exhaust pollutants emitted in the work-based
window to the amount of work done in the window, in g/kWh.
3.6 work-based window method
a method that evaluates vehicle emissions by comparing the compliance of specific
emissions of various work-based windows with those of engine type inspection specific
emissions.
3.7 average window power percentage
the percentage that the average power of the engine in the work-based window accounts
for the maximum net power of the engine.
3.8 valid work-based window
4.3.2 Determination of test vehicle compliance
a) For any pollutant specified in Article 4.1.1, if the proportion of the work-based
window that meets the emission limit requirements accounts for 90% or more of
the valid work-based window, the test vehicle will be judged as meeting the
emission standards. Otherwise, it is determined that the emission exceeds the
standard.
b) Among the valid data points, the data points whose NOx emission concentration
meets the limit requirements of Article 4.1.2 account for 95% or more of the valid
data points, then the test vehicle is determined to meet the emission standards.
Otherwise, it is determined that the emission exceeds the standard.
5 Emission compliance inspection of new production vehicles
and in-use compliance inspection
5.1 Emission compliance inspection of new production vehicles
5.1.1 The manufacturer shall formulate scientific and efficient self-inspection
procedures in accordance with the requirements of this Standard. Conduct self-
inspection on emission compliance of newly produced models (or series). Report the
results of the self-inspection to the competent environmental protection authority.
5.1.2 When the environmental protection authority conducts the inspection of the new
production vehicle emission standards on the model (or series), 3 vehicles are randomly
selected from the mass-produced vehicles. Determine according to the following rules:
a) Randomly select 1 vehicle from the 3 vehicles that are drawn in Article 5.1.2.
Carry out the actual road emission test according to the method specified in
Annex B. If the vehicle meets the requirements of Article 4.1, it is determined as
conforming.
b) If the vehicle does not meet the requirements of Article 4.1, if the manufacturer
submits a written application, the environmental protection authority shall
conduct the actual road emission test according to the method specified in Annex
B for the other two vehicles selected in Article 5.1.2. If both vehicles meet the
requirements of Article 4.1, it is determined to be conforming, otherwise it is not
conforming.
5.2 In-use compliance inspection
5.2.1 The manufacturer shall conduct self-inspection of in-use compliance according to
the test methods specified in this Standard. The in-use compliance self-inspection of
the engine manufacturer shall be carried out on the basis of the engine model (or family).
The in-use compliance self-inspection of vehicle manufacturers shall be carried out on
- Dry base CO concentration, %;
- Hydrogen molar ratio.
B.1.4 Test conditions
B.1.4.1 The composition of test conditions shall be close to the distribution of road
operating conditions when the vehicle is in normal use. Vehicle operating road
conditions include urban roads, suburban roads and expressways. According to the
vehicle category, the specific distribution and characteristics refer to the provisions of
B.1.4.2-B.1.4.6. The actual composition ratio is allowed to have a deviation of ±5%.
Due ...