Crowell & Moring, L.L.P.
Control apparatus for electric vehicle
 A more compact and light-weight drive unit is required for an electric vehicle in order to improve its mileage per charge, acceleration performance and overall efficiency. A control apparatus which generates drive signals to drive power devices in the power converter includes: a current reference generator calculates from a torque reference value a d-axis exciting current reference value on the basis of which the ac motor generates a magnetic flux, and a q-axis torque current reference value, the d-axis and the q-axis being orthogonal to each other; a current control circuit generates ac voltage reference values Vu*, Vv* and Vw* from the d-axis exciting current reference value and the q-axis torque current reference value; and a drive signal generator generates drive signals to drive power devices from the ac voltage reference values. Both the current reference generator and the current control circuit are processed digitally by the same arithmetic unit. 
Hitachi Car Engineering Co., Ltd. Hitachi, Ltd.
Y B Y Y B H
Y02T B60L Y02T Y02T B60L H02P
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Eiichi Ryoso Sanshiro Yuusuke Hiroyuki
Ohtsu Masaki Obara Takamoto Yamada