DEF/AdBlue Injection System

Product Specifications

Technical details and manufacturing context for DEF/AdBlue Injection System

Definition

The DEF/AdBlue Injection System is a critical component of the Exhaust Aftertreatment System in diesel vehicles. It meters and sprays a precise amount of Diesel Exhaust Fluid (a urea-water solution) into the hot exhaust gas upstream of the Selective Catalytic Reduction (SCR) catalyst. This initiates a chemical reaction that converts harmful nitrogen oxides (NOx) into harmless nitrogen and water vapor, enabling the vehicle to meet stringent emissions regulations. The system's electronic control unit (ECU) receives signals from engine and exhaust sensors (e.g., NOx sensors, temperature sensors). Based on this data, it calculates the required DEF dosing rate. A pump draws DEF from the tank and pressurizes it. A dosing valve or injector, controlled by the ECU, opens for precise durations to spray the atomized DEF into the exhaust pipe. The heat of the exhaust gas vaporizes the water and decomposes the urea into ammonia, which then reacts with NOx over the SCR catalyst. The system is designed for integration into commercial vehicles and passenger cars with diesel engines. It operates within a supply voltage range of 9–36 V DC, suitable for both 12V and 24V vehicle electrical systems. The operating pressure is typically 1.0–1.6 MPa, ensuring proper atomization and injection. Flow rates range from 0.5 to 5 L/h, matched to engine displacement and NOx output. Injection accuracy is maintained within ±2% to ensure efficient NOx reduction. The system is built to withstand underhood and exhaust mounting temperatures from -40°C to 85°C, and the fluid temperature range is -11°C to 60°C, accounting for DEF freezing point. Ingress protection ratings of IP54 to IP65 protect against dust and water jets. Materials include stainless steel for lines and injector, aluminum alloy for pump housing, engineering plastics for tank and connectors, and electronic components for sensors and ECU. The body material is specified as 316L stainless steel for corrosion resistance to DEF. Weight ranges from 1.5 to 3.5 kg depending on pump and heater integration. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The system's electronic control unit (ECU) receives signals from engine and exhaust sensors (e.g., NOx sensors, temperature sensors). Based on this data, it calculates the required DEF dosing rate. A pump draws DEF from the tank and pressurizes it. A dosing valve or injector, controlled by the ECU, opens for precise durations to spray the atomized DEF into the exhaust pipe. The heat of the exhaust gas vaporizes the water and decomposes the urea into ammonia, which then reacts with NOx over the SCR catalyst.

Common Materials

Stainless Steel (for lines and injector), Aluminum Alloy (for pump housing), Engineering Plastics (for tank and connectors), Electronic Components (for sensors and ECU)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Flow Rate	0.5–5 L/h	Match to engine displacement and NOx output
Injection Accuracy	±2 %	Maintains NOx reduction efficiency
Supply Voltage	9–36 V DC	For 12V and 24V vehicle systemsISO 16750-2
Power Consumption	15–60 W	Includes pump and heater
Operating Temperature	-40–85 °C	For underhood and exhaust mountingISO 16750-4
Fluid Temperature Range	-11–60 °C	DEF freezing point is -11°CISO 22241-1
Ingress Protection	IP54–IP65	Protects against dust and water jetsIEC 60529
Body Material	316L	Corrosion resistance to DEFASTM A240
Weight	1.5–3.5 kg	Depends on pump and heater integration

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Dosing Control Unit (DCU)
The electronic brain of the system. It processes sensor inputs, calculates the required DEF dose, and controls the pump and injector.

Material: Electronic Components, Aluminum Housing
DEF Supply Pump
Draws DEF from the tank, pressurizes it, and delivers it to the dosing valve/injector.

Material: Stainless Steel, Engineering Plastics, Ceramic
Dosing Valve / Injector
A solenoid or piezoelectric valve that opens and closes precisely to meter and atomize the DEF spray into the exhaust stream.

Material: Stainless Steel, Ceramic (for nozzle)
DEF Tank with Level Sensor
Stores the Diesel Exhaust Fluid. The integrated level sensor provides data on fluid quantity to the vehicle's dashboard and control system.

Material: High-Density Polyethylene (HDPE), Stainless Steel (sensor)
Heated Delivery Lines
Insulated and/or heated hoses that transport DEF from the tank to the pump and injector, preventing crystallization in cold climates.

Material: Stainless Steel, PTFE (Teflon) Lining, Silicone Heating Elements

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for DEF/AdBlue Injection System.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Exhaust Aftertreatment System

View system integration details

Manufacturers of DEF/AdBlue Injection System

Manufacturer profiles associated with DEF/AdBlue Injection System.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 6 September 2026

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Frequently Asked Questions

What supply voltage does the system require?

The system operates on a supply voltage of 9–36 V DC, covering both 12V and 24V vehicle electrical systems. This range complies with ISO 16750-2. Confirm compatibility with your vehicle's electrical system.

What is the operating temperature range for the system?

The system is designed for underhood and exhaust mounting, with an operating temperature range of -40°C to 85°C, per ISO 16750-4. The DEF fluid temperature range is -11°C to 60°C, as DEF freezes at -11°C. Ensure the system is protected from extreme temperatures.

What materials are used in the system?

The system uses stainless steel for lines and injector, aluminum alloy for pump housing, engineering plastics for tank and connectors, and electronic components for sensors and ECU. The body material is specified as 316L stainless steel for corrosion resistance to DEF, per ASTM A240. Verify material suitability for your application.

Data Basis

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Preliminary Technical Classification

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pressure:	Up to 10 bar (system pressure), 4-6 bar typical injection pressure
flow rate:	0.5-20 L/h (adjustable based on engine size and NOx reduction requirements)
temperature:	-40°C to 85°C (operating), -40°C to 105°C (storage)
slurry concentration:	32.5% urea concentration in deionized water (standard DEF specification)

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

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