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Cylinder Deactivation

3 Cylinder as an 8 Stroke

Rolling CDA

I. Introduction

II. Vibration analysis for a three-cylinder engine

Figure 1 Deactivation level and torsional vibration excitation of different deactivation strategies for three-cylinder engines

III. Operating strategy for a rolling cylinder deactivation system

Figure 2 Fuel-saving potential of different operating strategies for cylinder deactivation in steady-state operation

IV. Design of a test engine

Figure 3 Comparison between series production and test engine

Figure 4 UniAir cylinder head module

Figure 5 Cylinder head with valve train modules for the intake and exhaust sides

Figure 6 Comparison of valve lift curves for the base engine and converted RCD test engine

Figure 7 Strategies for controlling the residual gas and intake valve lift with the UniAir system for rolling cylinder deactivation

Figure 8 Redesigned timing belt drive

V. Fired engine test

Figure 9 Set-up of the test bench for the fired engine tests

VI. Measurement results

Figure 10 Operating points of the testing program across the engine performance map

Figure 11 Impact of EIVC and cylinder deactivation on specific fuel consumption

Figure 12 Measurement results: Intake manifold pressure and indicated mean effective pressure for different operating strategies

Figure 13 Measurement results of gaseous untreated emissions and O2 concentration levels

Figure 14 Measurement results of raw engine-out particulate emissions in steady-state deactivation mode

VII. Summary and outlook

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

I. Introduction

VII. Summary and outlook