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Cam Phaser

Fast and Precise

Electrical Cam Shifting

I. Introduction

II. Hydraulic camshaft phasing systems

Figure 1 Design of a hydraulic camshaft phasing unit

Figure 2 Oil pressure of different generations of an engine family from 2004 (dark green) to 2016 (light red)

III. Electric Cam Phaser


Figure 3 The electromechanical camshaft phaser

Figure 4 Design of the gear-set for the electromechanical cam phaser

Figure 5 Topology of the electromechanical cam phaser

Figure 6 Hydraulic and electromechanical camshaft phasing units require the same amount of installation space

IV. Properties of the electromechanical cam phaser

Figure 7 Phasing speed of different camshaft phasing systems in relation to the engine speed

Figure 8 Timing adjustment with an electromechanical camshaft phasing unit at engine start-up

Figure 9 Adjusting the camshaft at engine start-up

V. Better comfort levels with the electromechanical cam phasing

Figure 10 The charge cycle as depicted in the schematic PV diagram: When the intake valves execute a delayed close, part of the charge is ejected during compression such that less air is compressed

Figure 11 Engine speed ramp-up when starting at different phase adjustment angles

Figure 12 Comparison of different start angles for „advance“ position

Figure 13 An intake camshaft adjustment reduces the acceleration amplitudes as the internal combustion engine enters shutdown

VI. Innovation

Figure 14 Simplified electromechanical camshaft phasing unit concept without engine-integrated sensor system

Figure 15 The BEMF and pulse method together cover the entire operating speed range of the actuator

VII. Summary and outlook

The digital version of the Schaeffler Symposium 2018 “Mobility for Tomorrow” conference transcript