Powertrain Systems

The Delphi Multec^® GDi Fast Single Coil Fuel Injector is designed for gasoline direct injection engines and features a fast single coil, ideal for spray stratified lean combustion applications. It provides outstanding spray and fuel injection performance at a lower cost than piezo injector technology. It also features an outwardly opening valve group actuated by a solenoid and operating at 200 bar fuel pressure.

The Delphi Multec 20 GDi Fast Single Coil Fuel Injector's operating principle is based on an outwardly opening valve group that generates a conical spray pattern. At precisely timed intervals, fuel is injected into the combustion chamber—near the spark plug—when the valve is closed and, thus, enables an optimally stratified mixture plume. The resulting efficiently atomized fuel spray has a superior spray quality (i.e. atomization and penetration), which supports the demands of stratified combustion in order to achieve greater engine operating efficiency.

Benefits

• Fast single coil design offers a better value compared to piezo technology
• Spray stratified direct injection features total drive cycle fuel economy improvements up to 15 – 20% compared to base engines
• Outwardly opening valve group provides excellent spray stability (cone shape) with robust established recirculation zone and a minimum sensitivity to tip deposit formation
  
•  50 V drive allows use of an industry standard driver and enables application of multiple injections with a hydraulic separation of less than 0.2 ms
• Enhanced linear flow range provides improved stratification capability and is suitable for turbo-charged engines
• Corrosion resistance, flow performance, and linear range to accommodate the requirements of ethanol fuel blends

Typical Applications

The Delphi Multec 20 GDi Fast Single Coil Fuel Injector can be applied to all gasoline engines, and is particularly suited for larger displacement gasoline engines in which fuel consumption is of greater concern. The large linear flow makes it ideally fitting to even homogeneous turbo-charged applications and the excellent atomization is able to optimally fulfill the needs of future combustion processes such as gasoline homogeneous charge compression ignition (HCCI) or controlled auto-ignition (CAI).

Availability

The Delphi Multec 20 GDi Fast Single Coil Fuel Injector will be available to automotive customers starting in the 2012 calendar year. Contact Delphi for further information.

Targeted Performance Specifications

Performance Advantages

Delphi's single solenoid-actuated Multec 20 GDi Fast Single Coil Injector is designed for central mount stratified lean gasoline direct injection engine applications and provides a more cost-effective device compared to piezo-actuated injectors. A robust spray cone, with a stable recirculation zone and fast multiple injections, enables an outstanding stratification capability.

Due to the use of conventional solenoid-actuation, the driver hardware is the same as for homogenous gasoline direct injection applications and therefore the electronic control unit (ECU) can also be used without modifications.

The Delphi Advantage

Delphi has produced hundreds of millions of gasoline fuel injectors over the years for customers around the world. That vast experience has led to product and manufacturing process improvements which have helped eliminate contamination-related failures and provided other quality and cost advantages. Delphi's in-depth knowledge of systems and the combustion process help optimize injector performance.

As a global leader in engine management systems technology, Delphi can help manufacturers meet emissions requirements, improve fuel economy and enhance performance. Delphi is a source for high value solutions and our systems approach is built into every product. Delphi's flexible engineering approach encourages collaboration. And, Delphi has a thorough understanding of automotive markets around the world and a global network of resources.