Generalized Adaptation of an Electric-Hydraulic hybrid drive system

James Long, Oregon Institute of Technology



KersTech Vehicle Systems is in the process of creating a hybrid drive system combining a flat format hydraulic motor with an electric motor for energy recapture of vehicle momentum. The initial drive system is targeted at a specific vehicle application. A main component of the drive system being developed is a controller and the associated algorithm. The controller algorithm is a new adaptation of an optimally robust algorithm for model uncertainties and resilience against control feedback gain perturbations.  This achieves general performance criteria to secure quadratic optimality with inherent asymptotic stability property together with quadratic dissipative type of disturbance reduction. The control system will be generalized for support of standard vehicle systems deriving a specification for sizing of algorithm parameters, behavior, and basic drive components. The combination of control algorithm, control algorithm implementation, electric-hydraulic hybrid drive will be tested to produce plans for system scaling and generalized application. The end result will be an electric-hydraulic  hybrid drive prototype targeted at a specific test platform yet capable of adaptation to any vehicle of a similar weight. Early simulations indicate a 20 - 30% increase in efficiency over typical electric vehicles in frequent start-stop drive cycles. This translates into an increase in EV range and runtime and potential decrease in battery bank size and cost.

Project Details

Project Type:
Project Status:
In Progress
End Date:
December 31,2016
UTC Grant Cycle:
Natl Round 1
UTC Funding:

Other Products

  • Xin Wang · Edwin E. Yaz · James Long 2014 Robust and resilient state-dependent control of discrete-time nonlinear systems with general performance criteria, Systems Science & Control Engineering: An Open Access Journal (PUBLICATION)
  • Xin Wang · Vamsi Krishna Pavuluri · James Long · Guangping Zhuo· Wen Lian Oct 2015 IEEE Vehicle Power and Propulsion Conference (VPPC), At Montreal, Canada (PUBLICATION)
  • Xin Wang · James Long · Wen Lian · Wangping Sun 2014 ASME International Mechanical Engineering Congress and Exposition, At Montreal, Canada (PUBLICATION)