Electric drive units for hybrid/electric vehicles

摘要

The paper is concerned with an Electric Drive Unit (EDU) system optimisation. Jaguar Land Rover (JLR) is strongly convinced that the integration of the constituents of the EDU, gear-box and electric machine, cannot be done down-stream of the development phase. Therefore in the past years has been developed a system optimisation process to achieve the best overall trade-off between concurrent requirements: efficiency on cycle, performance, packaging and cost. As an example of the benefits of the process a P4 (axle split) hybrid architecture is chosen as reference application for this paper. Following the vehicle performance requirements decomposition, two electric machine technology are optimised for the same package; induction asynchronous (IM) motor and internal permanent magnet synchronous (IPM) motor. A single speed versus a multispeed gearbox is also compared. A two speed IPM drive is finally indicated as the most promising candidate in the trade-off between cost and efficiency on cycle for the reference application.