Forthcoming articles

 


International Journal of Powertrains

 

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International Journal of Powertrains (4 papers in press)

 

Regular Issues

 

  • Transient Load Share Management of a Diesel Electric Hybrid Powertrain for Ship Propulsion   Order a copy of this article
    by Sotirios Topaloglou, George Papalambrou, Kostas Bardis, Nikolaos Kyrtatos 
    Abstract: In this paper, a transient load share methodology for a hybrid diesel electric marine propulsion system is presented. Aim of the system is the performance enhancement and reduction of gaseous emissions during low-load transient operation. The controlled variable is lambda while the manipulated variable is the torque from the electric motor regulated by a frequency inverter. The model for the lambda behavior is based on experimental identification while lambda values in feedback loop come from an actual and a virtual sensor, the later based on first principles modeling. A nominal model is used for the synthesis of a robust H-infinity controller for the controlled variable regulation. Experimental results in a full scale hybrid diesel electric powertrain under realistic loading scenarios verified the successful hybridization.
    Keywords: Hybrid-Electric Propulsion; emissions control; diesel engines; robust control.

Special Issue on: Recent Advances in Modelling, Control and Optimisation of Powertrains for Electric and Hybrid Electric Vehicles

  • Propulsion and Auxiliary Loads Identification and Validation Using HIL Simulations   Order a copy of this article
    by Soheil Mohagheghi Fard, Amir Khajepour 
    Abstract: Electrification of auxiliary systems in service vehicles can noticeably reduce engine idling time and fuel consumption. To replace an engine-driven auxiliary system with electric one, size of required components (a battery pack and a generator) should be determined based on information that can be obtained from propulsion and auxiliary loads of a target vehicle. Propulsion and auxiliary loads are defined as the portion of engine power that is used for moving the vehicle and auxiliary devices, respectively. In this paper, a model-based estimation algorithm is developed to estimate auxiliary and propulsion loads. The algorithm is validated using a hardware-in-the-loop system. The results show that the proposed algorithm can accurately identify propulsion and auxiliary loads in service vehicles.
    Keywords: Auxiliary torque estimation; Propulsion load identification; Hardware-in-the-loop; Mass estimation; Auxiliary load identification.

  • Investigation of Challenges in Interior and Surface Permanent Magnet Synchronous Machines during Integrated Charging Operation in Electric Vehicles   Order a copy of this article
    by Lakshmi Varaha Iyer, Chunyan Lai, Shruthi Mukundan, Himavarsha Dhulipati, Kaushik Mukherjee, Narayan Kar 
    Abstract: Power electronics and motor drive components existing in conventional electric vehicle (EV) drivetrain employed to propel the EV can be used to charge the battery under level 3 fast charging capacity as well. This beneficial feature is propelling research and development activities towards realizing this integrated charging technology in EVs. However, alternating magnetic field will be produced in the air-gap of the permanent magnet (PM) machine as a function of 3-phase AC charging current in its stator windings during integrated charging operation. Theoretically, this is expected to lead to unusual loss and magnet operating characteristics due to the stand-still nature of the rotor. Since, the same PM motor will be used for both traction and integrated charging, it is of paramount importance to understand the machines behavior during integrated charging to optimally design the PM machine for both applications. Hence, this paper exclusively investigates the: 1) permanent magnet operation; 2) electrical and magnet losses; 3) temperature rise; and 4) effect of winding inductances on voltages and currents, in both surface and interior permanent magnet synchronous machines designed for traction application and employed for integrated charging operation in EVs. This is the contribution of the paper. Investigations are conducted on both interior and surface permanent magnet synchronous machines available in the laboratory using their developed electromagnetic models in conjunction with finite element analysis and experimentation. Results obtained from investigations are analyzed and discussed.
    Keywords: Electric vehicle; powertrain; permanent magnet; electric motor; traction; charging; design; finite element; harmonics; inductance; losses; demagnetization.

  • Round and Rectangular Winding Loss Analysis and Optimization for a 22,000rpm 150kW Switched Reluctance Machine   Order a copy of this article
    by Daniël Hilgersom 
    Abstract: Under research is a Switched Reluctance Machine for the powertrain of an electric vehicle. The research focuses on accurate estimation and optimization of winding losses in switched reluctance machines. These losses result from both AC and DC resistance. An FEA based procedure is described which computes both components of loss. Round and rectangular conductors are both analyzed for a number of cases. Ultimately, rectangular conductors are chosen for more thorough analysis. Here, a number of winding geometries are simulated. Plotting conductor geometry versus conductor loss confirms a loss trend with a global minimum. For the motor design under consideration, this represents up to 4kW reduction in loss over the initially simulated round conductors.
    Keywords: electric powertrain; coil design; eddy currents; proximity effect; switched reluctance machine; winding losses.