The Chances and Potentials for Low-Voltage Hybrid Solutions in Ultra-Light Vehicles

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1 Switzerland, Schlatt, 9 th -10 th October 2014 The Chances and Potentials for Low-Voltage Hybrid Solutions in Ultra-Light Vehicles Dipl.-Ing. Robert Steffan Prof. Dr. Peter Hofmann Prof. Dr. Bernhard Geringer

2 Content CULT Cars Ultra-Light Technology Material concept Hybrid concept 12 Volt 48 Volt Conclusion Switzerland, 9 th -10 th October 2014 R. Steffan Slide 2

3 CULT Cars Ultra-Light Technology Vehicle curb weight: 600 kg CO 2 emissions: 49 g/km Sep First ideas Jul CAD design Nov Demonstrator vehicle Switzerland, 9 th -10 th October 2014 R. Steffan Slide 3

4 Content CULT Cars Ultra-Light Technology Material concept Hybrid concept 12 Volt 48 Volt Conclusion Switzerland, 9 th -10 th October 2014 R. Steffan Slide 4

5 Material concept BASE 900 kg ca. -80kg Integration of functions (cancellation of parts) Integrated fuel door ca. -100kg New materials (selective usage of lightweight materials) Multi-material body ca. -120kg Downsizing (& use of secondary effects) Weight reduction up to 300 kg Engine: 660 cm³ instead of 1000 cm³ TARGET 600 kg (achieved: 672,5 kg) Switzerland, 9 th -10 th October 2014 R. Steffan Slide 5

6 Material concept Switzerland, 9 th -10 th October 2014 R. Steffan Slide 6

7 Material concept Multi material body in white Fire wall made of sandwich material Fiber composite door and hood Composite axle module Composite floor Organic front crash system Switzerland, 9 th -10 th October 2014 R. Steffan Slide 7

8 Material concept Weight comparison (without doors & closures): CULT: 147 kg (measured incl. Paint) Benchmark veh.1 : 240 kg Benchmark veh.2 : 222 kg Switzerland, 9 th -10 th October 2014 R. Steffan Slide 8

9 Content CULT Cars Ultra-Light Technology Material concept Hybrid concept 12 Volt 48 Volt Conclusion Switzerland, 9 th -10 th October 2014 R. Steffan Slide 9

10 Hybrid concept 12 Volt Vehicle curb weight: 600 kg TARGET P0-Hybrid P1-Hybrid P2-Hybrid Belt-Starter-Generator (BSG) Micro Hybrid Mild Hybrid Conclusion Full and Plug-In Hybrid Increased recuperation potential by de-clutching the internal combustion engine (ICE) during deceleration BEV states Pure e-drive feature for low speeds (<35 km/h), comfort benefit for stop-and-go traffic or automated parking 12 Volt hybrid topology saved 9.5 % CO 2 compared to a conventional stop start configuration 12 Volt 48 Volt 100 Volt 200 Volt 300 Volt. Switzerland, 9 th -10 th October 2014 R. Steffan Slide 10

11 Hybrid concept 48 Volt U R Wire / 2 R Wire / R Current [A] Power (12 Volt) Power (48 Volt) Power (300 Volt) Power [kw] P demand 1000 W U 12 V 48 V I 83 A 21 A, P Losses, Wire 31 W 2 W relative 3,1 % 0,2 % Desired wire profile (relative) Today Tomorrow Weight for 1 m wire 223 g 22 g Factor 10! Switzerland, 9 th -10 th October 2014 R. Steffan Slide 11

12 Hybrid concept 48 Volt 2 sin F F Roll F Air F Grade F Acc Total vehicle resistance Rolling resistance tires Air resistance Road grade resistance Acceleration resistance F Acc F Air m Vehicle curb weight: 2000 kg vs. 680 kg F Roll F Grade Vehicle power demand (680 kg curb weight) 680 kg - Max. Power BSG 48V (Motor) 680 kg - Min. Power BSG 48V (Generator) 2000 kg - Max. Power BSG 48V (Motor) 2000 kg - Min. Power BSG 48V (Generator) Additional electrical traction potential enabled by ultra-light vehicle structure Conclusion Curb weight of a vehicle highly influences the dynamic behavior itself An ultra-light structure increases acceleration rates and max. velocity operated by a 48 Volt electrical machine Next to the CO 2 reduction by an intelligent operating strategy, this means a higher Fun-to-Drive value Switzerland, 9 th -10 th October 2014 R. Steffan Slide 12

13 Hybrid concept 48 Volt Max. Torque ICE Max. Torque BSG Combined Torque ICE + BSG (48V) Limited Torque ICE + BSG (48V) Additional torque potential due to 48 Volt electrical boost Conclusion ICE disadvantage concerning the low-end-torque (below 2500 rpm) can be compensated by an electrical boost with the 48 Volt Belt-Starter-Generator Full load available at nearly 0 rpm engine speed Switzerland, 9 th -10 th October 2014 R. Steffan Slide 13

14 Hybrid concept 48 Volt 680 kg -Basis 680 kg - Boost 48V 1000 kg - Boost 48V 1500 kg - Boost 48V 2000 kg - Boost 48V Concept Curb weight [kg] Time km/h [s] Potential [%] Basis ,6 - Boost 48V ,6-12,8 % Boost 48V ,7 + 7,1 % Boost 48V ,7 + 39,1 % Boost 48V ,1 + 73,7 % Switzerland, 9 th -10 th October 2014 R. Steffan Slide 14

15 Hybrid concept 48 Volt 680 kg -Basis 680 kg - Boost 48V 1000 kg - Boost 48V 1500 kg - Boost 48V 2000 kg - Boost 48V 2000 kg 48V Boost 1500 kg 48V Boost 1000 kg 48V Boost 680 kg 48V Boost 680 kg Basis After 10 Sec m - 10 m + 7 m + 24 m After 20 Sec m - 58 m -1 m + 46 m Switzerland, 9 th -10 th October 2014 R. Steffan Slide 15

16 Hybrid concept Velocity Acceleration 48 Volt New European Driving Cycle NEDC 680kg - Vehicle power demand Max. Power BSG 48V (Motor) Min. Power BSG 48V (Generator) Driving cycle conditions 2000 kg 1500 kg 1000 kg 680 kg All driving points (100%) 680 kg 1000 kg 1500 kg 2000 kg 50% 60% 70% 80% 90% 100% Theoretical substitution potential by 48 Volt BSG Switzerland, 9 th -10 th October 2014 R. Steffan Slide 16

17 Hybrid concept 48 Volt New European Driving Cycle NEDC 100% 100% 95% 95% 90% 90% 85% 85% 80% 80% 75% 75% 70% 70% 65% 65% 60% 60% 55% 55% 50% 50% 45% 45% 40% 40% Conventional Stop start ICE BSG motoring Recuperation Mechanical brakes Conventional 12,0 % 63,0 % 23,5 % Values related to time Switzerland, 9 th -10 th October 2014 R. Steffan Slide 17

18 Hybrid concept 48 Volt New European Driving Cycle NEDC 100% 100% 95% 95% 90% 90% 85% 85% 80% 80% 75% 75% 70% 70% 65% 65% 60% 60% 55% 55% 50% 50% 45% 45% 40% 40% Conventional 100,0 % 48V Hybrid -8,6 % -9,2 % 82,2 % Recuperation Electric driving Stop start ICE Electric driving Recuperation Mechanical brakes Conventional 12,0 3,8 % 23,5 12,2 % 23,5 % % % 63,0 % 48V Hybrid 30,6 % 29,2 % Values related to time Switzerland, 9 th -10 th October 2014 R. Steffan Slide 18

19 Hybrid concept 48 Volt New European Driving Cycle NEDC 100% 95% 90% 85% 80% 75% 70% 65% 60% 55% 50% 45% 40% Conventional 48V Hybrid 48V Plug-In 100,0 % 82,2 % 48,8 % Conclusion Up to 17,8 % fuel saving potential by exchanging the 12 Volt electrical system by a 48 Volt topology By an increasing battery capacity and an external charge support, CO 2 can be reduced to the half 48 Volt Plug-In concept defines a unique approach and is enabled by this ultra-light vehicle concept Switzerland, 9 th -10 th October 2014 R. Steffan Slide 19

20 Hybrid concept 48 Volt, Curb weight [kg] ,5 672, Electrical range [km] additional [kg] / electrical [km] ,3 5,1 5,2 8,2 2, Other Plug-In configurations Other Plug-In configurations Switzerland, 9 th -10 th October 2014 R. Steffan Slide 20

21 Content CULT Cars Ultra-Light Technology Material concept Hybrid concept 12 Volt 48 Volt Conclusion Switzerland, 9 th -10 th October 2014 R. Steffan Slide 21

22 Conclusion CULT 12 Volt Successful development of an outstanding and drivable ultra-light vehicle prototype with a curb weight of only 672,5 kg for a 4-seater A-segment car Development and integration of an innovative CNG hybrid powertrain Due to the ultra-light structure, the 12 volt hybrid system saved additional CO 2 as well as the potential to drive slow vehicle speeds purely electrically 48 Volt Update Due to the promising 48 Volt technology, an additional research project has started outlining the potential of a 48 Volt Belt-Starter-Generator configuration in the context of such an ultralight vehicle The low curb weight allows an extended electrical driving function in terms of acceleration and top speed (up to 90 km/h) Regarding the CO 2 legislation, there is a huge CO 2 saving potential using an intelligent operating strategy of internal combustion engine and electrical machine Overall, this 48 Volt solution is less complex compared to conventional high-voltage solutions, this finally reduces costs and could convince conservative costumers to buy a hybrid Switzerland, 9 th -10 th October 2014 R. Steffan Slide 22

23 CULT 12 Volt - hybrid prototype Styrian Business Promotion Agency Austrian Climate and Energy Fund CULT 48 Volt - research study Austrian Society of Automotive Engineers Belt-Starter-Generator ( Volt) Software + application support Switzerland, 9 th -10 th October 2014 R. Steffan Slide 23

24 Thank you for your attention! Thank you for your attention! Robert Steffan

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