Powertrain Systems

The Delphi Multec^® Diesel Common Rail System is a robust, cost-effective modular diesel fuel injection system. Due to its smart solenoid injector design, this innovative system is extremely fast and has injection performances similar to competitive servo-piezo technologies. Its unique control strategies enable the system to deliver precise fuel quantities over the life of the vehicle and provide optimal emissions control and acoustic performance.

The key elements of the Delphi Multec Diesel Common Rail System include:

• Compact fuel injectors for best possible packaging (17 mm or 19 mm pencil diameter)
• High pressure, modular pump (0.6 to 1.2 cm³⁄rev) enables operation up to 2,000 bar
• Tubular or spherical shape common rail
• Electronic control unit (ECU) with 32-bit processor
• Filter customized to application requirements

Benefits

• Modular, robust, and fast diesel fuel injection with a high level of injection performance
• Stable emissions and noise behavior throughout the life of the vehicle
• Unique control strategies such as Accelerometer Pilot Control (APC) and Individual Injection Characterization (I3C) provide optimal control of multiple injections
• Simple, reliable, and cost effective electronic design working with 12V battery voltage
• Does not require a fuel backflow cooler mechanism
• Robust, durable, and modular high pressure pump family designed for up to 2,000 bar capability and can support a variety of packaging and drive requirements
• Tubular or spherical common rails are hydraulically optimized to dampen waves, enabling precise and multiple fuel injections
• The system's fuel filter is validated with the system

Delphi Multec^® Diesel Common Rail System with tubular rail

Typical Applications

The Delphi Multec Diesel Common Rail System is suitable for the entire range of light duty vehicle applications. Current and future (Euro 4 and Euro 5) European emissions legislation can be met without the need for nitrogen oxide (NO_x) aftertreatment. To meet an engine manufacturer's requirements, the system can also integrate diesel particulate filter strategies and, potentially, NO_x exhaust aftertreatment strategies.

Performance Advantages

The Delphi Multec Diesel Common Rail System offers engine manufacturers significant simplification of the engine system design. The injectors operate at battery voltage and with the lowest energy requirements (compared with competitive technologies) to provide a less complex and more cost-effective electronics design. In addition, the injectors perform the pressure relief function in conjunction with the inlet metering system. This permits the elimination of a high pressure discharge valve to further simplify packaging and help reduce the overall cost of the system.

In this system, very small moving masses and short hydraulic circuits optimize inertia resulting in fast injector response. The balanced valve system requires only small forces to be applied and permits low spring loading. This helps eliminate the space and cost necessary for larger solenoid valves or retention springs.

The Delphi Multec Diesel Common Rail System features Accelerometer Pilot Control which enables the injectors to deliver a precise amount of fuel over the life of the engine. In this closed-loop system, an accelerometer attached to the engine block "listens" to the combustion enabling the engine management system to automatically optimize calibrations as conditions change. The result is a consistently clean, quiet, and smooth-running engine offering greater durability.

The system also features Individual Injector Characterization (I3C) which helps the engine run with optimum efficiency and enables the ECU to be calibrated with the injection system. The precise characteristics of each injector are read and programmed into the ECU when the engine is installed using a bar code label. This provides superb "first time" accuracy of injector performance.

The Delphi Advantage

Delphi offers a wide portfolio of diesel engine management systems and components. Delphi can integrate injection systems, air and fuel management systems, exhaust aftertreatment, and associated electronic controls and sensors to provide complete end-to-end diesel engine control systems that can help manufacturers meet emissions and fuel economy requirements around the world.

Delphi designs and manufactures complete diesel engine management systems for light duty, medium duty, and heavy duty applications. Delphi has 15 diesel design and engineering centers located in Europe, Asia, North America and South America, and 21 diesel manufacturing facilities in 13 countries enabling exceptional on-time delivery.