3. Utilizes regenerative braking Reduces fuel consumption and emissions Hydraulics have power density Optimal for frequent stop and go driving of large vehicles Features of a Hydraulic Hybrid

5. Increase vehicle fuel economy through regenerative braking Be adaptable to multiple vehicles with only component resizing Reduce vehicle emissions Fully functional, drivable vehicle by May Major Goals of the Project

6. Functions as both a pump and a motor (P/M) Regenerative mode: P/M pumps fluid Acceleration: P/M is driven by fluid Needs to be low speed, high torque, and variable displacement -Torque=Pressure*Displacement Pumps

7. An energy storage device During braking, hydraulic fluid compresses a gas or spring to store energy During acceleration pressure is released to help propel vehicle Accumulators

8. New components cannot add more than 10% of original vehicle mass to the vehicle Payback period: less than 2 years through fuel savings and reduced maintenance cost Major components sourced from commercial manufacturers Must have an expected life span of at least 10 years Project Constraints

9. Current Major Efforts Component selection and sizing -Units which will give broadest range of applications Test skid -Increase working knowledge of components -Design control and safety precautions -Validate design decisions Modeling - Predict performance of vehicle and components

10. Test Skid Validate model Quick and easy method for testing components and controls

11. Modeling Currently using MatLab/Simulink - These programs will be the basis for the controls Will be adding Hysan

12. Modeling

13. Deliverables and Deadlines Test Skid Running skid: 12/07/07 Analysis of preliminary results: 1/22/07 Vehicle Obtain vehicle: 1/23/08 System installation: 3/20/08 Presentations MIT VIP: 11/24/07 2 nd Oral presentation: 12/07/07 3 rd Oral presentation: 3/14/08 E-days: 4/18/08 Final presentation: 5/09/08