uniair – be prepared for tomorrow's combustion strategies...4 schaeffler symposium 2014 jerry...
TRANSCRIPT
Jerry Dixon
UniAir –
Be prepared for tomorrow's combustion strategies
Schaeffler Symposium 2014 Jerry Dixon 1
Where is the journey going?
New Driving Cycles
NoiseVibrationHarshness
Performance
NOx
CO2
Schaeffler Symposium 2014 Jerry Dixon 2
How to master this challenge?
Phasing (Timing) Lift, Timing and Duration
To
rqu
e
Engine speed
Schaeffler Symposium 2014 Jerry Dixon 3
Gasoline powered engines
Early valve closing
Early valve closing
Multilift
Late valve opening
Cylinder deactivation
Early valve closing
Late valve closing
Cam phasing
Full lift
Schaeffler Symposium 2014 Jerry Dixon 4
Mid load - Phasing to improve turbo charger response
Hydraulic VCT
Electric VCT
Valv
e lift
Exhaust Intake
360 270 450 90 540 630 180
Crankshaft angle in degrees
Cam phasing
Valv
e lift
Exhaust Intake
360 270 450 90 540 630 180
Schaeffler Symposium 2014 Jerry Dixon 5
Mid load – Early Intake Valve Closing (EIVC) strategy
Crankshaft angle in degrees
Early valve closing
UniAir
Cam shifting system
Switchable tappet Switchable roller
finger follower
Schaeffler Symposium 2014 Jerry Dixon 6
High load - Atkinson strategy V
alv
e lift
Exhaust Intake
360 270 450 90 540 630 180
Crankshaft angle in degrees
Late valve closing
Atkinson
UniAir
Cam shifting system
Switchable tappet Switchable roller
finger follower
Schaeffler Symposium 2014 Jerry Dixon 7
Low load - Cylinder deactivation (CDA) V
alv
e lift
Exhaust Intake
360 270 450 90 540 630 180
Crankshaft angle in degrees
Cylinder deactivation
Switchable
pivot element
UniAir
Cam shifting system
Switchable roller
finger follower
Schaeffler Symposium 2014 Jerry Dixon 8
Low load - Dethrottling V
alv
e lift
Exhaust Intake
360 270 450 90 540 630 180
Crankshaft angle in degrees
2-step-system
UniAir
Early valve closing
UniAir
Cam shifting system
Switchable tappet Switchable roller
finger follower
Schaeffler Symposium 2014 Jerry Dixon 9
Low load - Variable charge motion
UniAir
Valv
e lift
Exhaust Intake
360 270 450 90 540 630 180
Crankshaft angle in degrees
Hybrid- and Multilift
Hybrid
Multilift
Schaeffler Symposium 2014 Jerry Dixon 10
Internal EGR (with UniAir Gen2) V
alv
e lift
Exhaust Intake
360 270 450 90 540 630 180
Crankshaft angle in degrees
Valve overlap with boot lift
Valve overlap
UniAir
Schaeffler Symposium 2014 Jerry Dixon 11
Diesel fired engines
Target
Area DeNOx / SCR
P
art
icle
Fil
ter
Current engine
technology P
M-E
mis
sio
n
NOx-Emission
The PM / NOx-trade off
Schaeffler Symposium 2014 Jerry Dixon 12
Variable compression ratio
Crankshaft angle in degrees
Early valve closing
Valv
e lift
Exhaust Intake
360 270 450 90 540 630 180
EVC LVC
UniAir
Cam shifting system
Switchable tappet Switchable roller
finger follower
Schaeffler Symposium 2014 Jerry Dixon 13
Internal EGR V
alv
e lift
Exhaust Intake
360 270 450 90 540 630 180
Crankshaft angle in degrees
Cam phasing
Piston
position
EVC LVO
Exhaust gas
storage in
cylinder
Internal EGR with UniAir
Hydraulic VCT Electric VCT
UniAir
Schaeffler Symposium 2014 Jerry Dixon 14
Internal EGR
Valv
e lift
Exhaust Intake
360 270 450 90 540 630 180
Crankshaft angle in degrees
EGR storage in intake manifold
Piston
position
EGR rebreathing
EGR
storage in
intake
manifold
EGR
rebreathing
UniAir
Cam shifting system
Switchable roller
finger follower
Schaeffler Symposium 2014 Jerry Dixon 15 Page 15
What's next?
Schaeffler Symposium 2014 Jerry Dixon 16
Low load - Variable charge motion V
alv
e lift
Exhaust Intake
360 270 450 90 540 630 180
Crankshaft angle in degrees
Dynamic swirl control
Valve 1
Valve 2
UniAir
Cam shifting system
Switchable tappet Switchable roller
finger follower
Schaeffler Symposium 2014 Jerry Dixon 17
Methods of CDA with UniAir on the intake side V
alv
e lift
Exhaust Intake
360 270 450 90 540 630 180
Crankshaft angle in degrees
Additional intake stroke
UniAir UniAir
Rolling CDA
UniAir
Schaeffler Symposium 2014 Jerry Dixon 18
One system for all requirements?
To
rqu
e
Engine speed
Early valve closing
Early valve closing
Multilift
Late valve opening
Cylinder deactivation
Early valve closing
Late valve closing
Cam phasing
Full lift
Schaeffler Symposium 2014 Jerry Dixon 19
One system for all requirements?
To
rqu
e
Engine speed
Early valve closing
Early valve closing
Multilift
Late valve opening
Cylinder deactivation
Early valve closing
Late valve closing
Cam phasing
Full lift
UniAir only with
UniAir
Schaeffler Symposium 2014 Jerry Dixon 20
Customized solutions for your requirements
Dual E-VCT
CDA + CPS
Dual H-VCT
CDA
Single VCT
UniAir UniAir
Low Spec Natural aspired engine
Mid Spec Turbo charged engine
High Spec Turbo charged engine
Schaeffler Symposium 2014 Jerry Dixon 21
Are you prepared?
New Driving Cycles
NoiseVibrationHarshness
Performance
NOx
CO2
UniAir Switchable
tappet
Switchable roller
finger follower Hydraulic VCT
Switchable
pivot element
Cam shifting system
Electric VCT
Excellence is never an accident. It is
always the result of high intention,
sincere effort, and intelligent
execution; it represents the wise
choice of many alternatives
– choice, not chance, determines
your destiny.
”
‟
Aristotle
384 – 322 BC