4328805
Doser Fluid Supply Module
Cummins®

Introduction

The Cummins 4328805 Doser Fluid Supply Module is a critical component for commercial trucks, integral to the vehicle’s emissions control system. This module ensures the precise delivery of Diesel Exhaust Fluid (DEF) into the exhaust stream, playing a significant role in maintaining the efficiency and compliance of the truck’s emissions system.

Basic Concepts

The operation of the Doser Fluid Supply Module is based on the principles of emissions control within diesel exhaust systems. DEF, a solution of urea and deionized water, decomposes into ammonia and carbon dioxide when introduced into the heated exhaust stream. This process, known as Selective Catalytic Reduction (SCR), converts nitrogen oxides (NOx) into nitrogen and water vapor, reducing harmful emissions ¹.

Purpose and Function

This Cummins part ensures the accurate dosing of DEF into the exhaust stream, controlled by the engine’s electronic control unit (ECU). It monitors parameters such as exhaust temperature, engine load, and NOx levels to optimize the SCR process and reduce NOx emissions to meet regulatory standards ².

Key Features

The Doser Fluid Supply Module is characterized by its robust design, featuring high-quality materials resistant to DEF’s corrosive nature. It offers precise dosing capabilities and is designed for easy integration into the truck’s exhaust system, facilitating straightforward installation and maintenance.

Benefits

Utilizing the 4328805 Doser Fluid Supply Module enhances emission control, resulting in reduced NOx emissions and helping the vehicle meet stringent environmental regulations. Optimal DEF dosing can also improve engine performance and fuel efficiency by maintaining the engine’s operating parameters within desired ranges ³.

Installation and Integration

Installing this part involves verifying compatibility with the truck’s engine and exhaust system, preparing the system for integration, and connecting the module to the vehicle’s ECU for control and monitoring. Attention to these steps ensures effective operation within the system.

Maintenance and Troubleshooting

Regular maintenance of the Doser Fluid Supply Module includes inspecting for leaks, ensuring the dosing nozzle is unobstructed, and verifying electrical connections. Common issues such as dosing inaccuracies or malfunctions can often be resolved through routine maintenance or by following manufacturer-provided troubleshooting guidelines.

Regulatory Compliance

The Doser Fluid Supply Module aids in meeting emissions regulations set by authorities like the Environmental Protection Agency (EPA) and the California Air Resources Board (CARB). By facilitating efficient SCR operation, it helps reduce NOx emissions, ensuring compliance with current and future emissions standards.

Environmental Impact

The environmental benefits of the Doser Fluid Supply Module are significant. By enabling effective SCR, it reduces nitrogen oxide emissions from diesel engines, contributing to improved air quality and mitigating the environmental impact of commercial trucking operations.

Cummins Overview

Cummins Inc. is a global leader in designing, manufacturing, and distributing engines, filtration, and power generation products. With a history of innovation in diesel engine and emissions control technology, Cummins is committed to providing solutions that meet customer needs while addressing environmental challenges. The company’s product range includes engines and components designed for efficiency, reliability, and compliance with emissions standards.

Compatibility with Cummins Engines

The Doser Fluid Supply Module (Part 4328805) is compatible with various Cummins engine models, ensuring precise dosing of urea-based exhaust fluid for reducing nitrogen oxide emissions in compliance with environmental regulations.

• 6C8.3: Designed for heavy-duty applications, benefiting from precise fluid management.
• ISB/ISD4.5 CM2150 B119: Equipped with the CM2150 platform, integrating seamlessly for optimal SCR performance.
• ISB3.9 CM2220 B107: Compatible with the CM2220 platform, ensuring efficient operation within emission standards.
• ISB5.9 CM2880 B127: Designed for high-performance applications, relying on accurate fluid dosing.
• ISBE CM2150: Utilizes the Doser Fluid Supply Module for effective exhaust fluid delivery.
• ISBE4 CM850: Benefits from precise fluid management capabilities.
• ISF3.8 CM2220 AN: Ensures compliance with emission regulations through integration.
• ISF4.5 CM2220 F123: Designed for heavy-duty applications, relying on accurate fluid dosing.
• ISG11 CM2880 G108: Benefits from precise fluid management.
• ISG12 CM2880 G107: Designed for high-performance applications, relying on accurate fluid dosing.
• ISL9 CM2150 SN: Utilizes the Doser Fluid Supply Module for effective exhaust fluid delivery.
• ISL9.5 CM2880 L138: Designed for heavy-duty applications, benefiting from precise fluid management.
• ISZ13 CM2150 Z105: Benefits from precise fluid management capabilities.

Role in Engine Systems

The 4328805 Doser Fluid Supply Module is integral to the orchestration of several key systems within modern diesel engines, particularly those with advanced aftertreatment technologies. Its primary function is to regulate and deliver DEF to the aftertreatment device, ensuring optimal performance and compliance with emissions standards.

Integration with Aftertreatment Device

The aftertreatment device, typically a Selective Catalytic Reduction (SCR) system, relies on the precise injection of DEF to convert harmful nitrogen oxides (NOx) into harmless nitrogen and water vapor. The Doser Fluid Supply Module meters the DEF dosage according to the engine’s operational demands and the exhaust gas temperature, ensuring the SCR catalyst operates within its optimal temperature window for maximum efficiency in reducing emissions.

Connection to Diesel Exhaust Fluid Tank

The Doser Fluid Supply Module is directly linked to the diesel exhaust fluid tank, incorporating a pump and various sensors to monitor the fluid level, pressure, and temperature. It ensures DEF is delivered at the correct pressure and temperature to the aftertreatment device, preventing issues such as clogging or inefficient NOx conversion that can arise from improper DEF delivery.

Ensuring System Harmony

By accurately dosing DEF into the exhaust stream, the Doser Fluid Supply Module maintains the harmony between the engine’s power output and the aftertreatment system’s emissions reduction capabilities. It adapts to varying engine loads and speeds, ensuring DEF injection is synchronized with the engine’s operational state. This dynamic adjustment is essential for the longevity of the aftertreatment device and the overall efficiency of the engine system.

Conclusion

The Cummins 4328805 Doser Fluid Supply Module is a sophisticated component that ensures the seamless operation of the aftertreatment system by providing the necessary DEF in a controlled and precise manner. Its integration with the diesel exhaust fluid tank and the aftertreatment device is fundamental to the effective management of diesel engine emissions, contributing to improved air quality and compliance with environmental regulations.