Hitachi Automotive Systems, Ltd.

Hitachi Astemo Ltd.

Hirokazu Sambonsuge

Kohei Myoen

Kazuto Oyama

A position estimation system provided in a vehicle can include a front sensor, a peripheral sensor, a position estimation device, and a control device. The position estimation device can be configured to determine weights for each of a plurality of pieces of information related to a state and a surrounding environment of the vehicle, the plurality of pieces of information comprising vehicle speed, steering angle, traveling environment, predicted curvature, and surrounding environment. The position estimation device can then select whether to use a plurality of feature point groups including a part of the plurality of feature points detected by the front sensor and the peripheral sensor to estimate the position of the vehicle based on the weights.

Motor control device using temperature determination

The occurrence of torque in the motor due to an unintentional flow of the q-axis current in the motor during discharging of the smoothing capacitor is reduced. A motor control device according to the present invention controls a system including an inverter including a smoothing capacitor connected to a power source via a relay, a motor connected to the inverter, and a current sensor configured to detect a current flowing through the motor, the motor control device including: an electric discharge control unit configured to discharge, in the motor via the inverter, an electric charge accumulated in the smoothing capacitor; and a current sensor calibration unit configured to calibrate the current sensor in a state where no current in the motor flows during a time period from when the relay is cut off to when discharge control by the electric discharge control unit is started, wherein the electric discharge control unit performs discharge by controlling the current in the motor based on a value of the current sensor calibrated by the current sensor calibration unit.

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Hitachinaka, Japan

Hirokazu Sambonsuge