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This paper covers the development of a closed loop transaxle synchronization algorithm which was a key deliverable in the control system design for the L3 Enigma, a Battery Dominant Hybrid Electric Vehicle. Background information is provided to help the reader understand the history that lead to this unique solution of the input and output shaft synchronizing that typically takes place in a manual vehicle transmission or transaxle when shifting into a gear from another or into a gear from neutral when at speed. The algorithm stability is discussed as it applies to system stability and how stability impacts the speed at which a shift can take place. Results are simulated in The MathWorks Simulink programming environment and show how traction motor technology can be used to efficiently solve what is often a machine design issue. The vehicle test bed to which this research is applied is a parallel biodiesel hybrid electric vehicle called the Enigma.

This paper provides a concise, detailed overview of the concurrent development of a high-power, charge-sustaining, parallel-format, hybrid-electric vehicle (HEV). A brief introduction helps differentiate this effort's goals and approach from many others. Concurrent conceptual and detail design criteria and constraints and use of the highest-quality design resources in a large student team environment are discussed. Body, chassis, suspension, drive-train (including motor, engine and custom parallel transmission), energy storage and control system choices are discussed. Lessons learned from benchmarking, from a team-developed, real-time, graphical, hardware-in-the-loop simulation package and from virtual and physical mockups are shared. Experience gained in applying accepted design practice is examined.