JB/T 11880.7-2014 PDF English
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JB/T 11880.7-2014: Diesel engines - Selective catalytic reduction (SCR) systems - Part 7: NOx sensors
---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/JBT11880.7-2014
JB
MACHINERY INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 27.020
J 93
File No.: 47531-2014
Diesel engines - Selective catalytic reduction (SCR)
systems - Part 7: NOx sensors
ISSUED ON: JULY 09, 2014
IMPLEMENTED ON: NOVEMBER 01, 2014
Issued by: Ministry of Industry and Information Technology of the
People's Republic of China
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Requirements ... 6
5 Test methods ... 11
6 Inspection rules ... 16
7 Marks, packaging, transport and storage ... 17
Annex A (normative) Installation specifications for electrochemical NOx sensor
... 19
Annex B (informative) SAE-J1939 standard communication protocol for NOx
sensor ... 20
Annex C (normative) SCU functional state level classification of NOx sensor 21
Diesel engines - Selective catalytic reduction (SCR)
systems - Part 7: NOx sensors
1 Scope
This Part of JB/T 11880 specifies the terms and definitions, requirements, test
methods, inspection rules, marks, packaging, transport and storage for NOx
sensors (hereinafter referred to as NOx sensor) in selective catalytic reduction
(SCR) systems for diesel engines.
This Part is applicable to diesel engines and vehicles equipped with SCR
system. The NOx sensors applicable to other engines may refer to use.
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.
GB/T 191, Packaging and storage marks
GB/T 2423.1, Environmental testing - Part 2: Test methods - Tests A: Cold
GB/T 2423.2, Environmental testing - Part 2: Test methods - Tests B: Dry
heat
GB/T 2423.8, Environmental testing for electric and electronic products Part
2: Test methods Test Ed: Free fall
GB/T 2423.10, Environmental testing for electric and electronic products -
Part 2: Tests methods - Test Fc: Vibration (sinusoidal)
GB/T 2423.17, Environmental testing for electric and electronic products -
Part 2: Test method - Test Ka: Salt mist
GB/T 2423.22, Environmental testing - Part 2: Tests methods - Test N:
Change of temperature
GB/T 2423.30, Environmental testing - Part 2: Test methods - Test XA and
guidance: Immersion in cleaning solvents
GB/T 2423.34, Environmental testing - Part 2: Test methods - Test Z/AD:
Composite temperature/humidity cyclic test
GB/T 2828.1, Sampling procedures for inspection by attributes - Part 1:
Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection
GB 4208, Degrees of protection provided by enclosure (IP code)
GB/T 13384-2008, General specifications for packing of mechanical and
electrical product
GB/T 17619-1998, Limits and methods of testing for immunity of electrical /
electronic sub-assemblies in vehicles to electromagnetic radiation
GB/T 18655-2010, Vehicles boats and internal combustion engines - Radio
disturbance characteristics - Limits and methods of measurement for the
protection of on-board receivers
GB/T 19951-2005, Road vehicles - Test methods for electrical disturbances
from electrostatic discharge
GB/T 21437.2-2008, Road vehicles - Electrical disturbances from conduction
and coupling - Part 2: Electrical transient conduction along supply lines only
HJ 438-2008, Durability of Emission Control Systems of Compression
Ignition and Gas Fueled Positive Ignition Engines of Vehicles
QC/T 413-2002, Basic Technical Requirements for Automotive Electric
Equipment
SAEJ1939 (all parts), Recommended Practice for a Serial Control and
Communication Vehicle Network
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 NOx sensor
The sensor that detects nitrogen oxide (NOx) content such as NO, NO2 in
engine exhaust. According to the working principle, it can be divided into
electrochemical NOx sensor, optical NOx sensor, optical fluorescent NOx sensor
and NOx sensor of other principles.
3.2 electrochemical NOx sensor
The sensor that detects the content of nitrogen oxides in engine exhaust by
4.6.1 Low temperature resistance
The sensor control unit (SCU) of the NOx sensor is subjected to a low
temperature test at -40°C for 48h (24h low temperature storage, 24h low
temperature operation). After the test is completed and cooled to room
temperature, the functional state shall comply with level A as specified in Annex
C.
4.6.2 High temperature resistance
The sensor control unit (SCU) of the NOx sensor is subjected to a high
temperature test at 85°C for 72h (24h high temperature storage test, 48h high
temperature operation test). After the test is completed and cooled to room
temperature, the functional state shall comply with level A as specified in Annex
C.
4.6.3 Resistance to temperature changes
After the NOx sensor has undergone the temperature change test, the
functional state shall comply with level A specified in Annex C. The overall
appearance of the sensor is free of cracks and other adverse conditions.
4.7 Resistance to temperature/humidity combined cycle change
After the NOx sensor is subjected to the temperature/humidity cycle test, the
functional state shall be in accordance with level A specified in Annex C. The
overall appearance of the sensor is free of rust and other bad conditions.
4.8 Anti-drop performance
The NOx sensor is subjected to the anti-drop test. After the test, the shell is
allowed to be slightly damaged without affecting the performance of the product.
Its functional state shall comply with level A as specified in Annex C.
4.9 Vibration resistance
The NOx sensor is subjected to the vibration resistance test. After the test, there
shall be no damage or loose parts. The functional state shall comply with level
A as specified in Annex C.
4.10 Salt spray resistance
The NOx sensor is subjected to the salt spray resistance test. After the test, the
functional state shall comply with level A specified in Annex C.
4.11 Protection performance
4.11.1 Anti-foreign properties
According to the provisions of GB/T 17619-1998, choose one of the methods
for testing, such as strip line method, free field method.
5.5.2 Anti-static discharge interference test
Test according to the provisions of GB/T 19951-2005. The discharge level of
contact discharge and air discharge is ±4kV. In the charging mode and non-
charging mode, test the accessible surface of the sensor control unit (SCU).
Non-charging mode also requires testing each pin of the connector.
5.5.3 Transient immunity test along the power line
In accordance with the provisions of Clause 2 in GB/T 21437.2-2008.
5.5.4 Electromagnetic disturbance test
In accordance with the provisions of GB/T 18655-2010.
5.6 High and low temperature resistance test
5.6.1 Low temperature resistance test
In accordance with the provisions of test Ab in GB/T 2423.1.
5.6.2 High temperature resistance test
In accordance with the provisions of test Bb in GB/T 2423.2.
5.6.3 Temperature change resistance test
According to the method specified in test Na in GB/T 2423.22, the NOx sensor
part and the sensor control unit part are tested separately according to the test
parameters specified in Figure 2. The high temperature of the sensor part, TB,
is 120°C.
and the part of the sensor control unit are separately subjected to the frequency
sweep vibration test in the X, Y, and Z directions. The severity level of the
frequency sweep vibration test of the sensor part shall be in accordance with
the provisions of "Product installation locates on engine" in 3.12 of QC/T 413-
2002. The severity level of the frequency sweep vibration test of the sensor
control unit is in accordance with the provisions of "Product installation locates
at other locations" in 3.12 of QC/T 413-2002.
5.10 Salt spray resistance test
According to the provisions of GB/T 2423.17, the NOx sensor is subjected to
the salt spray resistance test for 144h.
5.11 Protection performance test
5.11.1 Anti-foreign test
According to the provisions of the IP6X test method in GB 4208, the NOx sensor
is tested for foreign matter prevention.
5.11.2 Waterproof test
According to the provisions of the IPX7 test method in GB 4208, perform a
short-time immersion test on the NOx sensor and the cable joint part. During
the test, the NOx sensor probe is sealed to avoid the sensor chip being
immersed in water. Carry out the waterproof test for the NOx sensor control unit
(SCU) according to the provisions of the IPX9 test method in GB 4208. Connect
the corresponding plug to the connector during the test.
5.12 Industrial solvent resistance test
Carry out the test according to the provisions of test XA in GB/T 2423.30.
Solvents are recommended to use brake fluid, antifreeze, engine oil, engine
fuel (diesel or gasoline) and urea and other solvents. The test requirements are
as follows:
- Dipping duration: 5 min ± 0.5 min;
- Test temperature: room temperature.
After the sensor is removed from the solvent, it is kept under normal
atmospheric conditions for 2h.
5.13 Durability test
According to the durability test method specified in HJ 438-2008, conduct the
durability test not less than 1000h on the engine bench for the NOx sensor.
Conduct the durability test not less than 800h at 85°C for the NOx sensor control
a) manufacturer’s name or trademark;
b) product model;
c) production date or production batch number;
d) main technical parameters of the product, such as 12V/24V.
According to the specific situation, additional items can be listed according to
user requirements.
7.1.2 Packaging marks
The basic content of packaging marks includes:
a) contents of product sign related to delivery: product name and trademark,
product model, specifications, customer drawing number;
b) manufacturer name, detailed address, postal code and telephone number,
fax;
c) production date or production batch number;
d) graphic mark for packaging, storage and transport: comply with the
relevant regulations of GB 191-2008;
e) text of the transport operation: the overall dimensions of the packaging
box (length × width × height), the number of products in each box, and the
total mass of the products in each box. According to the specific situation,
additional items can be listed according to user requirements.
7.2 Packaging
7.2.1 The packaging shall meet the requirements of GB/T 13384-2008. The
probe and connector of the sensor shall have protective measures (such as
shield, sheath) to prevent the inner cavity from being contaminated.
7.2.2 The packaging box shall be accompanied by product inspection certificate,
product manual and relevant exit-factory documents.
7.3 Transport
Ensure that the product is not damaged and damp during transportation.
7.4 Storage
The products shall be stored in a dry, ventilated, non-corrosive warehouse. At
the end of the storage period (24 months from the manufacturer's storage), the
product shall still meet the relevant regulations of this Part.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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