In today's vehicles, mechanical drives are being substituted with electric ones more often. In the powertrain, this shift is based on the need for more and more energy-efficient engines. If auxiliary drives like oil pumps or coolant pumps are decoupled from the internal combustion engine, they can be controlled individually and optimally. This decoupling is necessary for full hybrid drive technology, because the vehicle can also be driven without running an internal combustion engine. In the powertrain, electric motors are subject to considerably higher demands regarding reliability, freedom from maintenance and safety than the weaker motors previously used in the comfort area. To meets these demands, electronic commutated (EC), brushless electric motors are preferably used. In particular, the dynamic torque standards of these motors require the implementation of very quick closed-loop control loops on the control device. This naturally also places higher demands on the tools that develop and test the control systems. For the function development, dSPACE offers a modular, in-vehicle-capable Rapid Control Prototyping (RCP) system. A new, FPGA-based I/O board (field-programmable gate array) offers interfaces especially for EC drives, e.g. Hall effect sensors, encoders, and resolvers, as well as digital outputs to control the power stages. This can be combined with an universal RapidPro power stage module which is especially designed for EC motors. In hardware-inthe- loop simulation (HIL) the electric motor is simulated. To optimize the simulation, the motor model is partitioned between the real-time processor and the FPGA. This allows calculations of the current on the FPGA within 100 ns. An electronic load is used to drive this current through the power stages of the ECU.
Developing and testing electric drives: from prototyping to the HIL test
2009
13 Seiten, 5 Bilder, 7 Quellen
(nicht paginiert)
Aufsatz (Konferenz)
Datenträger
Englisch
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