Project

Problem:

• Small-scale hybrid vehicles don't really exist
• Traditional hybrid systems rely on planetary gearsets
• These systems become too complex, expensive, and inefficient when scaled down

Solution:

• Need for a simpler and lower-cost hybrid powertrain design
• Replace complex planetary gear systems with a mechanical differential coupling approach
• Goal: reduce complexity while maintaining or improving performance and efficiency

System

Methods

Overview:

• We designed a small-scale hybrid powertrain using an internal combustion engine (ICE) and a brushed DC motor
• The two motors were coupled together using a mechanical differential
• The differential took in the two input powers and produced a single increased output power

Design:

• The motors were chosen based on size and efficiency, in order to fit on the go-kart as well as apply enough power to drive the system
• The inputs utilize a gear and chain setup to connect to the differential, and differential to the go-kart axle
• Gears were chosen to ensure adequate torque transfer

Conclusion

Results

• The system was able to operate as designed; the power of the two inputs was able to be coupled together and produce a higher output than that of either motors alone
• The gear ratios chosen were able to provide efficient torque transfer and ensure the system was operable when loaded
• We were able to prove that utilizing a pre-fabricated tricycle differential as a coupling mechanism is a valid and efficient method for hybrid systems

Future:

• In the future of this system we would like to add more complexity to the code of the system, so that depending on the circumstance the system will alter the amount each motor is used, for the most efficient result