1. Optimization of a Hydraulic Hybrid Vehicle for On-Road Driving Katharina Baer, Liselott Ericson and Petter Krus Division of Fluid and Mechatronic Systems Linköping University

2. Hydraulic Hybrids  Energy recuperation  Peak-shaving/load leveling 2 Power demand Time Attractive for industry and research projects  Hydraulikdagarna 2015  Center for Compact and Efficient Fluid Power  passenger vehicles, mobile machinery

3. Hydraulic Hybrids: Some Options 3 Concept Variations Valves Gears Multiple component instances … + Control Concepts Concept Variations Valves Gears Multiple component instances … + Control Concepts Architectures Vehicle size Mobile Applications Series Parallel Power-Split

4. Hybrid Hydraulic Vehicle Modeling: Point of Departure 4

5. Application for Hydraulic Hybrid Vehicle 5 Architectures Vehicle size Mobile Applications Series Parallel Power-Split

6. Modeling 6

7. Vehicle Design Optimization  Sizing of driveline components  influences vehicle mass  Control parameters (pressure levels) Objective function integrated in Hopsan model Build-in optimization function 7

8. Results for fuel consumption But… 8

9. Results: combining the driving requirements 9

10. Iterative Process 10 model refinement, model alternatives, … Simulation model Simulation/Optimization Results

11. The Bigger Picture 11 Architectures Vehicle size Mobile Applications Series Parallel Power-Split Concept Variations Valves Gears Multiple component instances … + Control Concepts Concept Variations Valves Gears Multiple component instances … + Control Concepts Additional considerations ….

12. www.liu.se

13. Results for fuel consumption But… 13