Delphi Corporation has developed a new 1,800-bar common rail injection system for the next generation of medium-duty diesel vehicles.
Based on its Multec technology, the new medium duty common rail (MDCR1800) is designed for engines from four to nine liters in three primary applications: off-highway, commercial vehicles and large passenger vehicles such as North American SUVs.
Delphi’s new injection system is based on selected components from its proven Multec DCR (Diesel Common Rail) light-duty system.
At the heart of the new medium duty system is an advanced solenoid injector that Delphi says allows the smallest injection quantities and highest precision fuel delivery of any common rail system available today, including those using first-generation piezo injectors.
The system can deliver up to five injection events per cylinder cycle, giving engine designers flexibility to select the most appropriate combination of durability, driveability, noise and emissions.
Control over each event is so precise that the system can enable compliance with Tier III regulations for off-highway vehicles at 1,400 bar with just two injection events and no aftertreatment.
All Delphi common rail injectors operate at battery voltage with the lowest energy requirements of any common rail system, allowing simpler, more cost-effective electronics. The new Delphi Medium Duty electronic control unit can be engine-mounted, allowing engine manufacturers to supply complete engines with a high level of customization (for different markets and engine applications) possible just through software changes.
Delphi injection systems are currently on approximately 17 million (17%) of the some 100 million road-vehicle diesel systems worldwide. The company expects to be producing 3 million DCR systems per year by 2010.