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Delphi 2-Step Valve Lift System

Delphi 2-Step Valve Lift System
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POWERTRAIN SYSTEMS Delphi 2-Step Valve Lift System The Delphi 2-Step Valve Lift System is an advanced variable valve actuation technology that changes valve lift, duration and timing when opening and closing intake and/or exhaust valves during engine operation. The 2-step valve lift event is achieved through a rocker arm mechanism that works with a 3-lobe cam. The cam switches between high and low cam profiles via corresponding rocker arm lift modes. The system includes a 2-step rocker arm (2-step roller-slider finger follower) and an oil control valve for hydraulic actuation. Delphi's 2-Step Valve Lift System enables improved engine efficiency, which contributes to emissions reduction, as well as performance and fuel economy enhancements. In conjunction with dual independent variable cam phasing, the system can achieve even better emissions reduction, performance and fuel economy. • Fuel economy improvement ranges from 3.5% to 4.5% Delphi 2-Step Valve Uft Rocker Arm (with dual independent cam phasing) versus conventional dual (2-Step Roller-Slider Finger F°N°wer) cam phaser technology • Delivers increased low speed torque (2% to 3%) and higher peak power (3% to 5%) for better engine performance • Hydrocarbon emissions are reduced by 30 to 50% compared to programs without 2-step valve lift technology • The system can help manufacturers meet OBD II requirements • Enabler for homogeneous charge combustion ignition (HCCI) combustion strategies ► Typical Applications The Delphi 2-Step Valve Lift System is designed specifically for overhead cam engines that include hydraulic lash adjusters and roller finger followers. It can be configured for either default low mode or default high mode. ► Availability The Delphi 2-Step Valve Lift System has completed the company's rigorous validation testing, including fixture and fired engine durability tests. Contact Delphi to begin application development. www.delphi.com | © Delphi. All rights reserved. | 1

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Delphi 2-Step Valve Lift System 2-Step Valve Lift System 2-Step Rocker Arm (2-Step Roller-Slider Finger Follower) in Overhead Cam Engine Assembly Performance Advantages Delphi's 2-Step Valve Lift System is a simplified design that provides manufacturers with a high benefit-tocost ratio, especially when compared to other powertrain strategies. The system's compact design enables ease of packaging and can be deployed in most existing cylinder head designs. Delphi offers worldwide engine management systems expertise. We have the ability to provide optimized control algorithms to maximize...

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