JB/T 11880.6-2014 PDF in English
JB/T 11880.6-2014 (JB/T11880.6-2014, JBT 11880.6-2014, JBT11880.6-2014)
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Diesel engines. Selective catalytic reduction (SCR) systems. Part 6: Dosing control units (DCU)
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Standards related to (historical): JB/T 11880.6-2014
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JB/T 11880.6-2014: PDF in English (JBT 11880.6-2014) JB/T 11880.6-2014
JB
MECHANICAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 27.020
J 93
Filing number: 47530-2014
Diesel engines - Selective catalytic reduction (SCR)
systems - Part 6: Dosing control units (DCU)
ISSUED ON: JULY 09, 2014
IMPLEMENTED ON: NOVEMBER 01, 2014
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 5
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 8
4 Compilation rules for DCU type and model ... 9
4.1 Type of DCU ... 9
4.2 Product marking of DCU ... 9
5 Technical requirements ... 10
5.1 General requirements... 10
5.2 DCU’s communication function ... 11
5.3 OBD function of DCU ... 11
5.4 Protection performance ... 11
5.5 Electrical performance... 12
5.6 EMC performance ... 13
5.7 High-and-low-temperature resistance ... 16
5.8 Vibration resistance ... 17
5.9 Free fall resistance ... 20
5.10 Mechanical shock resistance ... 20
5.11 Salt spray resistance ... 20
5.12 Resistance to industrial solvents ... 21
5.13 Surface protection performance ... 21
6 Test method ... 22
6.1 Test conditions ... 22
6.2 Inspection of appearance and installation size ... 23
6.3 Protection performance test ... 23
6.4 Electrical performance test ... 23
6.5 Insulation withstanding voltage test... 26
6.6 High current injection test ... 26
6.7 Radiation immunity test ... 27
6.8 Magnetic field immunity test ... 27
6.9 Transient immunity test along the power line ... 27
6.10 Transient immunity test along non-power lines ... 28
6.11 Electrostatic discharge characteristic test ... 28
6.12 Radiation emission test ... 29
6.13 Conducted emission test ... 29
6.14 Conducted transient emission test ... 29
6.15 High-and low-temperature resistance test ... 29
6.16 Combined cyclic temperature/humidity resistance test ... 30
6.17 Vibration resistance test ... 31
6.18 Free fall test ... 31
6.19 Mechanical shock resistance test ... 31
6.20 Salt spray resistance test ... 32
6.21 Industrial solvent resistance test ... 32
6.22 Surface protection inspection ... 33
7 Inspection rules ... 34
7.1 Inspection category ... 34
7.2 Exit-factory inspection ... 34
7.3 Sampling inspection ... 34
7.4 Type inspection ... 34
8 Marking, packaging, transportation, storage ... 36
8.1 Marking ... 36
8.2 Packaging ... 37
8.3 Transportation ... 38
8.4 Storage ... 38
Appendix A (Informative) DCU communication requirements ... 39
A.1 Address ... 39
A.2 Independent dosing control unit ... 39
A.3 Integration of dosing control unit and metering pump dosing control unit ... 39
A.4 Integration of dosing control unit in the EECU ... 39
A.5 Integration of dosing control unit, EECU, metering pump dosing control unit
... 40
A.6 Send message ... 40
A.7 Receive message ... 44
Appendix B (Informative) OBD monitoring requirements for DCU ... 49
B.1 The SCR system’s OBD needs to monitor the failure of the following
components and functions ... 49
B.2 Temporary interruption of system operation and monitoring functions ... 50
B.3 Activation and extinction of fault indicator ... 50
B.4 Action time of torque limiter ... 50
B.5 Interface method with diagnostic tools ... 50
Appendix C (Normative) Classification of DCU functional status ... 51
C.1 General provisions ... 51
C.2 Class A ... 51
C.3 Class B ... 51
C.4 Class C ... 51
C.5 Class D ... 51
C.6 Class E ... 52
Appendix D (Normative) DCU operating mode ... 53
D.1 Operating mode 1 ... 53
D.2 Working mode 2 ... 53
D.3 Working mode 3 ... 53
Appendix E (Informative) Test report ... 54
E.1 Test report form of high current injection test ... 54
E.2 Test report form of radiation immunity test ... 54
E.3 Test report form of electrostatic discharge characteristic test ... 55
Diesel engines - Selective catalytic reduction (SCR)
systems - Part 6: Dosing control units (DCU)
1 Scope
This part of JB/T 11880 specifies the terms and definitions, rules for type and
model formulation, technical requirements, test methods, inspection rules and
their markings, packaging, transportation and storage of dosing control units in
selective catalytic reduction (SCR) systems for diesel engines.
This part applies to diesel engines with selective catalytic reduction (SCR)
systems. Other engines and aftertreatment systems can be implemented by
reference.
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 191 Packaging - Pictorial marking for handling of goods
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 2423.6 Environmental testing for electric and electronic products - Part
2: Test methods - Test Eb and guidance: Bump
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 2423.56 Environmental testing for electric and electronic products -
Part 2: Test methods - Test Fh: Vibration, broad-band random (digital control)
and guidance
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/T 13306 Plate
GB/T 13384 General specifications for packing of mechanical and electrical
product
GB 17691-2005 Limits and measurement methods for exhaust pollutants
from compression ignition and gas fueled positive ignition engines of
vehicles (III IV V)
GB/T 18655 Vehicles boats and internal combustion engines - Radio
disturbance characteristics - Limits and methods of measurement for the
protection of on-board receivers
GB/T 19951 Road vehicles -- Disturbances test methods for electrical /
electronic component from electrostatic discharge
HJ 437-2008 Technical specification for on-board diagnostic(OBD)system of
compression ignition and gas fueled positive ignition engines of vehicles
QC/T 625 Metallic coatings and conversion coatings for automobiles
QC/T 29106 Technical specification of automobile wire harness
ISO 7637 (all parts) Road vehicles - Electrical disturbances from conduction
and coupling
ISO 11452-1 Road vehicles - Component test methods for electrical
disturbances from narrowband radiated electromagnetic energy - Part 1:
General principles and terminology third edition
ISO 11452-2 Road vehicles - Component test methods for electronic
disturbances from narrowband radiated electromagnetic energy - Part 2:
Absorber-lined shielded enclosure
5.4.3 Waterproof performance
DCU should adopt the IPX9 requirements in ISO 20653 for waterproof test.
5.5 Electrical performance
5.5.1 Overvoltage performance
The DCU shall be subjected to an overvoltage test, to confirm its ability to not
be damaged under the power supply overvoltage condition. The test shall be
carried out in accordance with the provisions of 6.4.1.
12 V system: Test at a temperature of (Tmax - 25 °C); the functional status of the
DCU shall reach Class B as specified in Appendix C.
24 V system: Test at a temperature of (Tmax - 25 °C); the functional status of
DCU must reach the class B as specified in Appendix C.
5.5.2 Slow drop or ramp of supply voltage
The DCU carries out the power supply voltage drop or ramp test according to
6.4.2. Within the power supply voltage range as specified in Table 2, the
functional status shall reach the class A as specified in Appendix C; outside the
power supply voltage range, the functional status shall reach the class C as
specified Appendix C.
5.5.3 Reset performance for voltage dip
To verify the reset performance of the DCU under constant voltage dips, it is
suitable for devices with reset functions (for example, devices equipped with
one or more microcontrollers).
The DCU shall be tested in accordance with the provisions of 6.4.3. After the
test, the functional status of the DCU shall reach the class C as specified in
Appendix C.
5.5.4 Short circuit protection
The DCU shall be tested according to the provisions of 6.4.4. After the test, the
functional status of the DCU shall reach the class C as specified in Appendix C.
5.5.5 Battery reverse protection
The DCU shall be tested in accordance with the provisions of 6.4.5. It shall be
able to withstand the power supply polarity reversal test of 60 s ± 6 s without
damage.
clearly visible; no salt water shall enter the DCU housing; the functional status
of the DCU shall reach the class A as specified in Appendix C.
5.12 Resistance to industrial solvents
DCU should be subject to industrial solvent resistance test to determine the
ability of DCU to withstand industrial solvents. The types of solvents are
recommended to use more than 3 kinds of solvents such as brake fluid,
antifreeze, engine oil, engine diesel, wheel cleaner, glass cleaner.
Manufacturers and users can negotiate to add additional tests; during selection
of product materials, it shall consider the resistance to chemical reagents as
early as possible.
The DCU undergoes the test in a non-working state. After the specified time of
industrial solvent soaking, air-drying, the corresponding number of cycles, there
shall be no changes that reduce normal functions (for example, sealing
function); signs and labels shall be kept clearly visible; the functional status of
the DCU shall reach the class C as specified in Appendix C.
5.13 Surface protection performance
5.13.1 Coating and chemical treatment layer
The coating and chemical treatment layer of the metal parts of the product shall
meet the requirements of QC/T 625.
5.13.2 Painting layer
5.13.2.1 Appearance of the painting layer: The external painting layer of the
product shall be uniform, free of bubbles, blanks, accumulation, overflow.
5.13.2.2 The adhesion of the painting layer: The painting layer of the product
shall be firmly bonded to the surface of the covered object; the painting layer
shall not fall off after the grid method test.
5.13.2.3 Temperature resistance of the painting layer: After the painting layer of
the product is subjected to the high-temperature test specified in this part, there
shall be no shrinkage or delamination.
5.13.2.4 Corrosion resistance of the painting layer: The painting layer of the
product is not allowed to rust after undergoing a 48-hour salt spray resistance
test.
5.13.3 Other
deviation occurs; record this current in the test report.
6.7 Radiation immunity test
The radiated immunity test of the product shall meet the requirements of ISO
11452-2, as follows:
a) When the test frequency is greater than 30 MHz, use the horizontal and
vertical polarization; when the test frequency is less than or equal to 30
MHz, it only uses vertical polarization.
b) When the test frequency is greater than or equal to 1000 MHz, the DCU
shall be tested in at least three perpendicular directions.
c) In all tests, the frequency jump point is executed according to strict
requirements. The monitoring of electrical signals shall use high
impedance connections to prevent coupling to the walls of the darkroom.
The analog load or signal generator shall be placed in a dark room.
6.8 Magnetic field immunity test
The magnetic field immunity test shall meet the requirements of ISO 11452-1
and ISO 11452-8.
Before performing the DCU test, use the prescribed procedures to calibrate the
test equipment. The configuration of the test device shall help exposing the
DCU directly to the magnetic field of the magnetic field strength specified in the
test plan. It shall also help exposing the magnetic sensor that may be connected
to the DCU to the magnetic field. This can be achieved by a magnetic radiation
coil or Helmholtz coil with a diameter of 120 mm. The distance between the test
bench or any part of the ground plane and the radiation ring or Helmholtz coil
shall not be less than 200 mm.
The test shall be performed in three orthogonal directions. If an abnormality
occurs, the magnetic field strength shall be reduced until the abnormal
phenomenon disappears; then the magnetic field strength shall be gradually
increased until the abnormality occurs again. The magnetic field strength at this
time is used as the threshold and the explained in the experiment report.
6.9 Transient immunity test along the power line
The transient immunity test of the product along the power line complies with
the requirements of ISO 7637-1 and ISO 7637-2.
6.12 Radiation emission test
The radiation emission test shall be carried out in accordance with GB/T 18655.
6.13 Conducted emission test
Conducted emission test shall be carried out in accordance with GB/T 18655.
6.14 Conducted transient emission test
The conducted transient emission test shall meet the requirements in ISO 7637-
2, as follows:
a) Turn off the external switch and power up the DCU. Verify that the
functions of the DCU are operating correctly. Set the trigger level of the
oscilloscope to 80% of the set limit. When setting the time base value,
adjust the oscilloscope’s sampling rate to the highest level available for
the selectable time base.
b) For all component categories with switching power supply circuits,
measure and record the peak instantaneous voltage when the DCU is
turned off and on 10 times (10 times in each case).
6.15 High-and low-temperature resistance test
6.15.1 Low-temperature resistance test
Carry out the test in accordance with the corresponding test method in the test
Ad (low-temperature test of heat dissipation sample’s gradual temperature
gradient - The test sample is energized after the temperature starts to stabilize)
in GB/T 2423.1.
DCU is subject to a 24-hour low-temperature storage test under the low-
temperature condition of -40 °C according to the operating mode 1.1 as
specified in Appendix D. Power on the DCU, carry out a 24-hour low-
temperature operating test according to the operating mode 3.2 as specified in
Appendix D. Check the DCU to see whether its function meets the requirements.
6.15.2 High-temperature resistance test
Carry out the test in accordance with the corresponding test method in the test
Bd (high-temperature test of heat dissipation sample’s gradual temperature
gradient - The test sample is not-energized during the regulating period of the
Place the DCU full of reagents at the specified temperature for 24 hours and
under the specified time and temperature sufficient to affect the properties of
the material, the defined resistance performance will not change. The model of
chemical reagents used in the test shall be negotiated between the supplier and
the buyer.
A contaminant is used for one sample. Coat the surface of the uncontaminated
DCU with reagents. Excessive reagents are allowed to drip from the DCU
during the test.
6.22 Surface protection inspection
6.22.1 Inspection of metal plating and chemical treatment layer
The metal plating and chemical treatment layer of DCU shall be inspected
according to the method as specified in QC/T 625.
6.22.2 Inspection of paint layer
6.22.2.1 Visual inspection of paint layer
The appearance quality of the paint layer of DCU is inspected by visual
observation.
6.22.2.2 Adhesion inspection of paint layer
It can directly use the grid method to form nine squares on the surface paint
layer of the three samples of the fully dried product or sample (10 cm x 15 cm),
by using blade to make four horizontal and vertical lines, at a spacing of 1 mm,
to make inspection. The paint layer in the grid shall be free of layering.
16.22.2.3 Temperature resistance test of the paint layer
It is carried out simultaneously with the high-temperature resistance test as
specified in 6.15.2.
6.22.2.4 Salt spray resistance test of paint layer
It is carried out simultaneously with the salt spray resistance test as specified
in 6.20. Observe whether the paint layer of the product is corroded after 48
hours of the test.
6.22.2.5 Other protective inspections
Check with naked eyes.
8 Marking, packaging, transportation, storage
8.1 Marking
8.1.1 Product mark
8.1.1.1 The nameplate of the product shall be fixed on the obvious part of the
DCU; its basic contents include:
a) Product name and trademark;
b) Product model;
c) Production date (or serial number) or production batch number;
d) The main technical parameters of the product;
e) The name of the manufacturer.
Items can be added according to specific conditions, such as product
implementation standard number, quality grade mark, warning signs or warning
instructions in Chinese, product barcodes, etc., or according to user
requirements.
8.1.1.2 The nameplate of the product shall meet the requirements of GB/T
13306.
8.1.2 Packaging mark
The basic content of the packaging mark includes:
a) The content of the product mark related to the shipment: product name
and trademark, product model, specification;
b) The name, full address, postal code and telephone number of the
manufacturer;
c) Production date (or serial number) or production batch number;
d) Product’s implemented standard number;
e) Packaging, storage and transportation pictorial signs (in accordance with
GB 191);
f) The text of the transportation operation: the overall dimensions of the
packaging carton (length x width x height); the quantity of products in each
Appendix A
(Informative)
DCU communication requirements
A.1 Address
In the CAN bus, the source address of DCU is 0x3D. The address of EECU is
0x00; the address of NOx sensor downstream of the catalytic converter is 0x52.
A.2 Independent dosing control unit
A.2.1 Send message: DM1, DM2, DM3, DM4, DM11, DM12, TI1, ACK, EEC3.
A.2.2 Receive message: AT10G1, PGNRQ.
A.2.3 In addition to the above basic messages, the communication messages
between the DCU and the metering pump are determined by the metering pump
manufacturer.
A.3 Integration of dosing control unit and metering pump
dosing control unit
A.3.1 Send message: see A.2.1.
A.3.2 Receive message: see A.2.2
A.4 Integration of dosing control unit in the EECU
A.4.1 Send message: DM1, DM2, DM3, DM4, DM11, DM12, ACK, TI1, EEC3.
A.4.2 Receive message: PGNRQ, AT10G1, EEC1, AMB, ENGTEMP, INCON.
A.4.3 In addition to the basic messages mentioned above, the communication
messages between EECU and the metering pump are determined by the
manufacturer of the metering pump.
Appendix B
(Informative)
OBD monitoring requirements for DCU
B.1 The SCR system’s OBD needs to monitor the failure of the
following components and functions
B.1.1 Nitrogen oxide sensor: It shall monitor its power supply, electrical failure,
signal range, signal deviation and signal credibility, deviation of upstream and
downstream nitrogen and oxygen concentration.
B.1.2 Urea solution supply pump: The voltage range of the pressure sensor,
the pressure range of the urea pump, the electrical failure of the urea pump
motor, the deviation of the urea pump’s motor speed, the effectiveness of the
temperature duty cycle of urea pump heater, the effectiveness of temperature
measurement of the urea pump, the effectiveness of the temperature duty cycle
of urea pump, the electrical failure of the urea reversing valve’s actuator (if
applicable), the reliability of the reversing valve (if applicable), the reliability of
the heating of the urea pump, etc.
B.1.3 Urea solution level sensor: It shall monitor the electrical failure, the urea
solution level, the reliability of the urea consumption.
B.1.4 Urea temperature sensor: It shall monitor the electrical failure, the urea
solution level, the overheating of urea tank.
B.1.5 SCR exhaust temperature sensor: It shall monitor the electrical failure,
signal credibility.
B.1.6 Urea nozzle: It shall monitor its current and electrical failure (if applicable).
B.1.7 Urea heating device: It shall monitor the electrical failure, reliability of the
heating circuit.
B.1.8 Air valve: It shall monitor air failure, atmospheric pressure (if applicable).
B.1.9 Pressure tube: It shall monitor the pressure range, reliability of pressure
(if applicable).
B.1.10 Nitrogen and oxygen emission monitoring: It shall monitor the failure
where the nitrogen and oxygen emission exceeds 7.0 g/ (kW • h). According to
the provisions of GB 17691-2005, the national IV emission shall monitor the
failure where the nitrogen and oxygen emission exceeds 5.0 g/ (kW • h); the
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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