2-Drive Motor Control Unit for Electric Power Steering

Paper #:
  • 2017-01-1485

Published:
  • 2017-03-28
Abstract:
In recent years, Power steering system has been replaced to electric power steering (EPS), in order to achieve better fuel consumption and reduce exhaust emissions and now EPS also plays important roles in driving assistance such as active safety and automated parking, so its number is expected to increase more and more. EPS is one of many automotive applications that requires a high level of safety. Since installation of EPS system started from light weight vehicles, fail-safe concept of the EPS system is reverting to manual steering mode if a failure occurs by any chances in order to maintain steering control. Now, EPS is expanding to heavier vehicles such as SUVs and Pickup Trucks, which require higher output motor power, with the advance in the power electronics technology. As the weight of the vehicle with the EPS increases, there is increase in the importance of an argument about avoidance of a sudden loss of electric power steering. DENSO has developed new motor control unit (MCU) to realize safer EPS, which was adopted a redundant 2-drive technology, in order to maintain the assist of EPS by one drive function, even if another drive unit shuts down after the failure occurrence. The redundant 2-drive architecture applies 2-drive motor technology, 2-drive inverter control technology and 2-drive current control technology. One of the advantage in our redundant 2-drive architecture is that the temperature rise is lower. With the decentralization of heat by splitting inverter units and 2-drive inverter control technology. With the advantage, we were able to decrease the size of our newly developed product compared to our previous product. Also, we were able to decrease the failure rate of sudden loss of assist dramatically. Description of the newly developed MCU and 2-drive technologies are shown in the presentation.
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