- SKF.com
Transcription
- SKF.com
Vehicle electrification & hybridization Edward Holweg Director, Product and Systems Development Capital Markets day 2010 Technology challenges in the automotive industry Key business drivers: • Wheel end weight & friction reduction • Transmission technologies & efficiency • Engine downsizing & boosting • Engine management • Vehicle electrification & hybridization Tesla Roadster CMD 2010 Future powertrain - Two main streams Powertrain today Powertrain optimization - Downsizing - Boosting - Weight reduction - Friction reduction - New transmission solutions CMD 2010 Powertrain electrification - Micro-, Mild-, Full Hybrids - Energy recovery systems - Range extenders - E-Motors - E-Accessories Electrification challenges CMD 2010 Car OEMs tackle the challenges with different technologies CMD 2010 Current industry fleet average 2006 Targeted industry fleet average 2012 Electrical hybridization and electric vehicle Micro hybrid, Stop-Start Current industry fleet average, 2006 Targeted OEM fleet average, 2012 Micro/Mild hybrid, KERS Mild hybrid torque assist Full hybrid electric drive Plug-in hybrid Battery electric vehicle Fuel cell vehicle 160 CO2 Fleet average (gr/km) CMD 2010 130 CO2 gr/km 120 CO2 gr/km (2012-2015) Sensor integration technology - A key competence CMD 2010 Sensor-bearing technology Main advantages of tight air gap control between target and sensor body are: 1. Temperature variations vs bearing stiffness performance 2. Smaller air gap limits sensitivity to external magnetic field AIRGAP Hall sensor Hall plate Target CMD 2010 Bearing outer ring Bearing inner ring Sensor-bearing benefits Enhance e-motor performance • Increase motor efficiency – High accuracy (1°accuracy ~ 2% efficiency saving) • Minimize motor noise – High resolution reduces torque ripple Magnetic Reduce total cost and increase compactness • Design flexibility and easy to assemble (one single part, performance checked) CMD 2010 Motor efficient map versus sensor accuracy Motor NVH signature according to resolution SKF sensor-bearings for vehicle electrification SKF Rotor Positioning Sensor-Bearing Unit SKF Motor Encoder Sensor-Bearing Unit Traction Motor SKF Commutation Sensor-Bearing Unit SKF Commutation Sensor-Bearing Unit SKF Rotor Positioning Bearing Stop-Start EPS Motor SKF Rotor Positioning Sensor-Bearing Unit CMD 2010 SKF Rotor Positioning Bearing Challenge • Rotor angle measurement compatible with existing customer production process for alternator products Innovative solution • Customized impulse ring integrated within bearing, leveraging on innovative magnet material development Benefits • Powerful, accurate, repeatable and durable impulse ring magnetic field • High resistance to harsh running condition • High integration into customer application CMD 2010 In series production since 2008 SKF Rotor Positioning Sensor-Bearing Unit Challenge • Extremely accurate and repeatable permanent magnet e-motor angle measurement, to increase motor efficiency Innovative solution • To provide accurate/high resolution angle measurement minimizing the non-linearity error leveraging on bearing performance Benefits Sine and cosine output • Accurate and repeatable output signal • Modular output interface • Scalable performances independent by customer manufacturing process • High magnetic field immunity CMD 2010 Incremental output Modeling and simulation CMD 2010 SKF Vehicle Environmental Performance Simulation tool S SKF software to translate bearing friction into real-life fuel savings and CO2 reduction, for a complete vehicle CMD 2010 SKF Vehicle Environmental Performance Simulation tool Bearing Target Target Bearing Target TargetSensor Signal Sensor Signal Conditioning Conditioning Target Target • SKF Rotor Positioning Bearing Sensor Sensor Tools designed for a 6 Sigma approach X’s Controllable & Noise factors • Shaft Position Sensor • SKF Commutation Sensor-Bearing Unit Y’s Response ÆDefine the target value for each parameter (Xs) to optimize the response ÆDetermine the variability of the outputs ÆPredict accuracy of the sensor-bearing aannccee Benefits: To get a better and quicker design “Right first time” bbaallaannccee rffoorrm m er GGoooodd biilliittyy n ttoo ppe ssiiggn aarriiaab e v e Æ Determine the sensor-bearing accuracy including both customers specification D v s D / r s e / r ccoosstt paarraam meette o t o t n and SKF design parameters influence p g n e D Deessiig siddeerriinngg tthhe n si ÆDecrease prototyping cost and quicker design to fit ccoon the customer’s needs by adjusting the parameters CMD 2010 Conclusions The automotive industry is undergoing a rapid change due to fuel consumption and CO2 regulations SKF is developing solutions in the following areas • • • • • Friction and weight reduction Transmission technologies & efficiencies Vehicle electrification and hybridization Engine management Engine down-sizing & boosting Vehicle electrification and hybridization • Fully integrated sensors solution for e-motor control in hybrid and electrical powertrain architectures • Enhance e-motor performance (efficiency and noise) • Reduce total cost and improve overall packaging CMD 2010 CMD 2010