Diesel engines - Selective catalytic reduction (SCR) systems - Part 4: Urea solution supply pump
1 Scope
This part of JB/T 11880 specifies the terms and definitions, types and models, requirements, test methods, inspection rules as well as marking, packaging, transportation and storage of urea solution supply pump (hereafter referred to as “urea pump”).
This part is applicable to diesel engines and other vehicles equipped with SCR systems, and may serve as a reference for engines for other purposes.
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 documents (including any amendments) applies.
GB/T 2423.1 Environmental testing for electric and electronic products - Part 2: Test methods - Tests A: Cold
GB/T 2423.2 Environmental testing for electric and electronic products - Part 2: Test methods - Tests B: Dry heat
GB/T 2423.17 Environmental testing for electric and electronic products - Part 2: Test methods - Test Ka: Salt mist
GB/T 2423.22 Environmental testing - Part 2: Tests methods - Test N: Change of temperature
GB/T 2423.34 Environmental testing for electric and electronic products - 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 13306 Plates
GB/T 17619-1998 Limits and methods of testing for immunity of electrical/electronic sub-assemblies in vehicles to electromagnetic radiation
GB 18655 Vehicles, boats and internal combustion engines - Radio disturbance characteristics - Limits and methods of measurement for the protection of on-board receivers
GB/T 19951-2005 Road vehicles - Test methods for electrical disturbances from electrostatic discharge
QC/T 29106 Technical specification of automobile wire harness
ISO 16232-3 Road vehicles - Cleanliness of components of fluid circuits - Part 3: Method of extraction of contaminants by pressure rinsing (First edition)
ISO 16232-10 Road vehicles - Cleanliness of components of fluid circuits - Part 10: Expression of results (First edition)
ISO 22241-1 Diesel engines - NOx reduction agent AUS 32 - Part 1: Quality requirements (First edition)
SAE J1939 (All parts) Recommended practice for a serial control and communication vehicle network
SAE J2044 Quick connect coupling specification for liquid fuel and vapor/emissions systems
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
urea solution supply pump
device for conveying urea solution to urea injector, which is classified into air-assisted urea solution supply pump and airless-assisted urea solution supply pump
3.2
air-assisted urea solution supply pump
device for conveying urea solution in accurate metering to urea injector with the assistance of air, which has supply and metering functions
3.3
airless-assisted urea solution supply pump
device for conveying urea solution to urea injector, which only has supply function
3.4
liquid pressure sensor
sensing element for transmitting the pressure signal of urea solution in the urea pump
3.5
gas pressure sensor
sensing element for transmitting the pressure signal of gas in the urea pump
3.6
electronic control unit
electronic control unit for metering urea solution injection quantity and fault diagnosis
3.7
urea pump rated condition
ambient temperature: 25±2℃; urea temperature: 25±2℃; relative humidity: 50%~60%; outlet back pressure: 101±5kPa
3.8
urea pump rated flow
nominal value of the specified volume flow discharged from the pump outlet during normal operation under rated condition
4 Types and models
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Types and models
4.1 Types
4.2 Models
5 Requirements
5.1 General requirements
5.2 Appearance and dimension
5.3 Fault diagnosis (if controller is available)
5.4 Metering precision (if any)
5.5 Sealing performance
5.6 Durability
5.7 High and low temperature resistance (if heating function is available)
5.8 Heating function (if any)
5.9 Protective performance
5.10 Cleanliness
5.11 Vibration resistance
5.12 Salt spray resistance
5.13 Abnormal voltage resistance
5.14 Electromagnetic compatibility
5.15 Insulation and voltage resistance
6 Test method
6.1 Test conditions
6.2 Test of appearance and installation dimension
6.3 Fault diagnosis test
6.4 Metering precision test
6.5 Sealing performance test
6.6 Durability and reliability test
6.7 High and low temperature resistance test
6.8 Heating function test
6.9 Protective performance test
6.10 Cleanliness test
6.11 Vibration resistance test
6.12 Salt spray resistance test
6.13 Abnormal voltage resistance test
6.14 Electromagnetic compatibility test
6.15 Insulation and voltage resistance test
7 Inspection rules
7.1 Inspection category
7.2 End-of-manufacturing inspection
7.3 Sampling inspection
7.4 Type inspection
8 Marking, packaging, transportation and storage
8.1 Marking
8.2 Packaging
8.3 Transportation and storage
Table 1 Working voltage range of urea pump
Table 2 Cyclic injection quantity
Table 3 Cycle time
Table 4 Sweep frequency vibration test
Table 5 Inspection items
