Smart Phasing – Needs based concepts for camshaft phasing systems Kevin Poole Engine load Functional requirements for VCT Systems Engine speed Camshaft angle Flexibility for engine start Engine speed Time 1 Schaeffler Symposium 2014 Camshaft timing accuracy Da Time Kevin Poole Shifting velocity Da Dt Time …and the changing oil pressure landscape Engine type: I4 Engine load 5.0 4.5 4.0 2004 Oil pressure in bar 3.5 Engine speed 3.0 2.5 Camshaft angle Flexibility for engine start 2.0 1.5 Engine speed 1.0 Da Shifting velocity Da Dt 0.5 0.0 0 Time 2 Camshaft timing accuracy Schaeffler Symposium 2014 1000 Kevin Poole 2000 3000 4000 EngineTime speed in rpm 5000 6000 7000 Time …and the changing oil pressure landscape Engine type: I4 5.0 4.5 4.0 2004 Oil pressure in bar 3.5 3.0 2.5 2008 2.0 1.5 1.0 0.5 0.0 0 3 Schaeffler Symposium 2014 1000 Kevin Poole 2000 3000 4000 Engine speed in rpm 5000 6000 7000 …and the changing oil pressure landscape Engine type: I4 5.0 4.5 4.0 2004 Oil pressure in bar 3.5 3.0 2.5 2008 2.0 1.5 2012 1.0 0.5 0.0 0 4 Schaeffler Symposium 2014 1000 Kevin Poole 2000 3000 4000 Engine speed in rpm 5000 6000 7000 Comparison of system capabilities HCP with cartridge OCV Oil consumption Shifting velocity HCP with central OCV Pressure accumulator OPPORTUNITY! ECP High 5 Schaeffler Symposium 2014 Low Kevin Poole Low High Dynamic Camshaft torque in Nm Fundamentals of cam phasing dynamic cam torque 10 5 0 -5 -10 -100 -50 0 50 Camshaft angle in °Cam 6 Schaeffler Symposium 2014 Kevin Poole 100 Rotor Stator Dynamic Camshaft torque in Nm Fundamentals of cam phasing dynamic cam torque 10 5 0 -5 -10 -100 -50 0 50 Camshaft angle in °Cam 7 Schaeffler Symposium 2014 Kevin Poole 100 Rotor Stator Fundamentals of cam phasing dynamic cam torque Camshaft phaser angle in °Cam Retard Advance 8 Schaeffler Symposium 2014 Kevin Poole Fundamentals of cam phasing oil flow B A FPull = const. Vacuum Rotor "B" Bowl pEnviroment 9 Schaeffler Symposium 2014 Kevin Poole Stator Solving the vacuum issue oil reservoir B A B Camshaft phaser A Oil volume A B P T 10 Oil control valve Schaeffler Symposium 2014 Kevin Poole Solving the vacuum issue oil reservoir Camshaft angle a Da Q (Standard) DQ Q (Smart phaser) a (Standard) Time 11 Schaeffler Symposium 2014 Kevin Poole Average oil flow Q oil pump a (Smart phaser) Design - camshaft phaser Standard Smart Phaser Sprocket Reed check valve Stator Rotor Oil res volume 12 Schaeffler Symposium 2014 Kevin Poole Design - oil control valve Standard Smart Phaser P P A A V B B T Oil reservoir supply port 13 Schaeffler Symposium 2014 Kevin Poole Oil flow – phasing to base position B A T P B A A-A Camshaft Central valve Central solenoid 14 Schaeffler Symposium 2014 Kevin Poole Camshaft phaser Simulation – Standard phaser shift velocity vs oil flow 600 Shifting velocity in °Cr/s 500 4,5 bar 400 3,5 bar 300 2,5 bar Camshaft torque 200 1,5 bar ±20 Nm ±5 Nm 100 0,5 bar Oil pressure 0 0 16 Schaeffler Symposium 2014 2 Kevin Poole 4 6 Average oil flow of oil pump in L/min 8 10 Simulation – Smart phaser shift velocity vs oil flow [°KW/s] Verstellgeschwindigkeit Shifting velocity in °Cr/s 600 500 4,5 bar 400 300 3,5 bar 1,5 bar 0,5 bar ±20 Nm 2,5 bar 200 ±5 Nm 100 0 0 17 Schaeffler Symposium 2014 2 Kevin Poole 4 6 Average Mittlerer oilÖlvolumenstom flow of oil pumpininL/min L/min 8 10 Simulation – Smart phaser shift velocity vs oil flow 300 ±20 Nm Standard Smart phaser 250 Shifting velocity in °Cr/s ±15 Nm 200 ±10 Nm 150 ±5 Nm 100 50 0 0.0 18 Schaeffler Symposium 2014 0.5 Kevin Poole 1.0 1.5 2.0 2.5 3.0 Average oil flow of oil pump in L/min 3.5 4.0 Test results – shift velocity Oil temperature: 90°C 300 100 to retard 0 Standard Smart phaser to advance Shiftingvelocity velocityinin °Cr/s °Cr/s Shifting 200 -100 1200 rpm -200 -300 0 1000 2000 3000 4000 5000 Engine speed in rpm 19 Schaeffler Symposium 2014 Kevin Poole 6000 7000 8000 Test results Camshaft phaser angle in °Cam Retard ZOOM Advance 20 Schaeffler Symposium 2014 Kevin Poole Test results Oil pressure in bar Camshaft phaser angle in °Cam Standard 21 R A Oil pressure in camshaft Schaeffler Symposium 2014 Kevin Poole Test results Oil pressure in bar Camshaft phaser angle in °Cam Standard 22 R A Oil pressure in chamber A Schaeffler Symposium 2014 Kevin Poole Test results Oil pressure in bar Camshaft phaser angle in °Cam Standard 23 R A Oil pressure in chamber B Schaeffler Symposium 2014 Kevin Poole Test results Camshaft phaser angle in °Cam Standard R A Oil pressure in bar 24 Smart phaser Schaeffler Symposium 2014 Kevin Poole Test results Camshaft phaser angle in °Cam Standard +0.5 °Cam R Oil pressure in bar A Vacuum 25 Smart phaser Schaeffler Symposium 2014 Kevin Poole Comparison of system capabilities - revisited HCP with cartridge OCV Oil consumption Shifting velocity HCP with central OCV Pressure accumulator Smart phaser ECP High 26 Schaeffler Symposium 2014 Low Kevin Poole Low High Smart phasing solving the hydraulic camphasing puzzle significantly reduced reduced significantly oil consumption consumption oil 27 Schaeffler Symposium 2014 Kevin Poole / and highershifting shiftingvelocity velocity higher at equal equal controllability controllability at ‟ If something doesn’t yet exist, it! I inventinvents it. ” Luccherini VCTEnrico Systems Team 1932 -
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