Control aspects of energy efficient hydromechanical transmissions

My research focus on control strategies for complex hydromechanical transmissions. This includes the control of the full transmission as well as its components. It also includes methods for evaluating transmission control strategies in early design stages.

Hydromechanical transmisisons

Hydromechanical transmissions are characterized by a use of hydraulic pumps and motors to transfer the energy from a combustion engine to the wheels in a driveline. This enables a continuously variable transmission gear ratio, which facilitates exact control of the tractive force and allows the combustion engine to operate in its most efficient point. By adding a planetary gear train and clutches to the transmission, its efficiency and versatility may be increased further. The machine’s fuel consumption may be lowered even further by including a hydraulic accumulator to the transmission, which enables recuperation and reuse of energy in hybrid concepts.

Control

With increased complexity of the transmissions, the need for fast, accurate control increases as well. A challenge in this area is that the transmissions are very versatile which makes it difficult to find a general control strategy that is applicable to more than one specific concept. This in turn presents another challenge in how to test the control strategies early in the design process to evaluate the feasibility of both the control strategy and the transmission concept itself. 

 

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Academic Degrees

  • Licentiate of Engineering degree in Fluid and Mechatronic Systems, LiU, Sweden, 2017.
  • Master of Science in Mechanical Engineering, LiU, Sweden, 2014.
 

Awards

Hydraulik och pneumatikföreningen, received a scholarship for best master’s thesis 2014. 

Research Project
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Publications
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2019

2018