Valvetrain Systems - Michigan State University Valvetrain...

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Michigan State University Dan Gauthier Delphi Corporation Rev Date. 18JL2006 Page 1 Valvetrain Systems Dan Gauthier Delphi Corporation
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Michigan State University Dan Gauthier Delphi Corporation Rev Date. 18JL2006 Page 2 Valvetrain Systems - Chapter Outline Function of Valvetrain Review of Major Market Motivating Factors Review of Major System Types Variable Cam Timing System Type II Continuously Variable Lift Type 5 Deactivation Electro Hydraulic Valvetrain Component Design Springs, Cam Profile, Lifters, Rocker Arms, Valves Summary
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Michigan State University Dan Gauthier Delphi Corporation Rev Date. 18JL2006 Page 3 Valvetrain System Primary Function • Transform rotary camshaft motion into linear valve motion in order to control fluid flow into and out of the combustion chamber. Secondary Function • Drive ancillary devices such as distributors, oil pumps, fuel pumps, water pumps and power steering pumps Camshaft Lifter / Tappet Pushrod Rocker Arm Valves Valve Spring Valve Spring Retainer Valve Keys
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Michigan State University Dan Gauthier Delphi Corporation Rev Date. 18JL2006 Page 4 Factors Motivating Valvetrain Change c Fuel Economy • Friction losses • Exhaust Gas Recirculation c Emissions • Improved Volumetric Efficiency • Exhaust Gas Recirculation • NOx, HC [NMOG], CO c Performance • Power & Torque vs. Displacement c Drivability • Idle Quality – NVH Indicates Focus Area
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Michigan State University Dan Gauthier Delphi Corporation Rev Date. 18JL2006 Page 5 U.S. Regular Conventional Retail Gasoline Prices - 0.50 1.00 1.50 2.00 2.50 3.00 3.50 8/11/1987 5/7/1990 1/31/1993 10/28/1995 7/24/1998 4/19/2001 1/14/2004 10/10/2006 7/6/2009 Time $USD Per Gallon Not Inflation Adjusted 2005 Dollars - Inflation Adjusted US Gas Prices Data Sources: 1. http://www.eia.doe.gov/oil_gas/petroleum/data_publications/wrgp/mogas_home_page.html 2. http://data.bls.gov/PDQ/servlet/SurveyOutputServlet
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Michigan State University Dan Gauthier Delphi Corporation Rev Date. 18JL2006 Page 6 Friction Valvetrain friction, when using sliding friction interfaces, can represent a substantial portion of overall engine friction at low speed. Use of rolling friction interfaces can substantially reduce low speed valvetrain friction. (Possible side effects on heater performance and oil temperature)
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Michigan State University Dan Gauthier Delphi Corporation Rev Date. 18JL2006 Page 7 Friction w/ Roller Followers w/ Roller Followers & Needle Bearing Rockers
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Michigan State University Dan Gauthier Delphi Corporation Rev Date. 18JL2006 Page 8 NMOG SULEV .04 .12 .20 .28 .36 NOx .02 .04 .08 .10 .12 .06 TLEV (until 06) LEV 1 (until 06) ULEV 1 (until 06) LEV 2 PM=0.01 ULEV 2 PM=0.01 Bin 5 Bin 2 Bin 5 50 kmile std Bins 2 120 kmile std. California NOx emissions
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Valvetrain Systems - Michigan State University Valvetrain...

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