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Delphi Cylinder Deactivating Roller Finger Follower

Delphi Cylinder Deactivating Roller Finger Follower
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Delphi Cylinder Deactivating Roller Finger Follower - 1

POWERTRAIN SYSTEMS Delphi Cylinder Deactivating Roller Finger Follower The Delphi Cylinder Deactivating Roller Finger Follower (DRFF) is an advanced variable valve actuation technology that enables cylinder deactivation during engine operation. The cylinder deactivation event is achieved through a rocker arm mechanism that works with a 3-lobe cam. The cam switches between full- and zero-lift cam profiles via corresponding rocker arm modes. The system includes a deactivating rocker arm (deactivation roller-slider finger follower) and an oil control valve (OCV) for hydraulic actuation. The DRFF and OCV can be implemented in engines employing traditional deactivation schemes on fixed cylinders for fuel economy improvement. Additionally, the valve train components are essential elements of the Delphi-Tula Dynamic Skip Fire (DSF) Cylinder Deactivation System. Cylinder deactivation significantly improves engine efficiency and reduces fuel consumption by firing fewer cylinders at lower torque loads to reduce pumping and heat losses. DSF takes cylinder Delphi’s Cylinder Deactivating Roller Finger Follower and Oil Control Valve deactivation a step further by firing each cylinder only as necessary during each engine revolution, depending on engine torque demand. DSF also reduces noise, vibration and harshness by choosing firing patterns that avoid vehicle and driver resonance frequencies. 5% to 20% fuel economy improvement compared with conventional spark ignition engines and depending on the engine implementation and driving conditions (upper range of fuel economy improvements require DSF); and the potential to reduce CO2 emissions by up to 20% Fast response allows full cylinder deactivation in a single cam revolution at speeds up to 3500 rpm Compact packaging allows integration into existing cylinder heads with minimal modification Low mass DRFF delivers stable high speed dynamic behavior Availability Delphi’s Cylinder Deactivating Roller Finger Follower and Oil Control Valve are targeted to be available for production in early 2018. Engineering samples will be available to qualified automotive manufacturers in 2016. Contact Delphi for more information. Typical Applications Delphi’s Cylinder Deactivating Roller Finger Follower is designed for overhead cam engines that include hydraulic lash adjusters and roller finger followers. The design is optimized for applications implementing the Delphi-Tula Dynamic Skip Fire Cylinder Deactivation System. www.delphi.com | © Delphi. All rights re

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Delphi Cylinder Deactivating Roller Finger Follower - 2

Delphi Cylinder Deactivating Roller Finger Follower Performance Advantages The Delphi Cylinder Deactivating Roller Finger Follower and Oil Control Valve offer compact size to simplify manufacturer packaging in existing engine applications. The DRFF’s stiffness characteristic enables stable, high speed dynamics for excellent performance. The Delphi-Tula Dynamic Skip Fire Cylinder Deactivation System is a pioneering new technology for improved fuel economy. The foundation of the system is unique new software developed by Tula Technologies, Inc. coupled with Delphi’s engine management systems...

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