Patent ID: 8324856
Filing Date: 2012-12-04
Classification: B60K,B60L,B60W,F16H,H02P,Y02T

Abstract:
1. A motor drive control apparatus configured to drive and control a motor using electric power from a direct-current power source, the motor drive control apparatus comprising: a motor drive circuit configured to drive the motor using a voltage form a side of the direct-current power source; a voltage converter capable of boosting a voltage on a side of the motor drive circuit with respect to the voltage on the side of the direct-current power source; a voltage control module that controls the voltage converter so as to make the voltage on the side of the motor drive circuit become a target post-boost voltage that is a target value corresponding to a target operation point of the motor in accordance with a predetermined boost restriction when the target operation point of the motor is included in a boost region, the boost restriction dividing an operation region of the motor into a non-boost region and the boost region, the non-boost region including a region in which a loss produced by driving the motor when not boosting the voltage on the side of the motor drive circuit becomes smaller than the loss produced when boosting the voltage on the side of the motor drive circuit, the boost region including a region in which the loss produced when boosting the voltage on the side of the motor drive circuit becomes smaller than the loss produced when not boosting the voltage on the side of the motor drive circuit; and a drive circuit control module that controls the motor drive circuit so as to make the motor operate at the target operation point, wherein the motor drive control apparatus includes a second boast restriction that defines a boost selection line defining a boundary between the non-boost region and the boost region to be on a low rotational speed side and a low torque side in comparison with the boost restriction, wherein the voltage control module controls the voltage converter so as to make the voltage on the side of the motor drive circuit become the target post-boost voltage corresponding to the target operation point of the motor in accordance with the second boost restriction if the target operation point of the motor is included in the boost region in the second boost restriction when a maximum torque line and the boost selection line cross each other while the voltage on the side of the motor drive circuit is not boosted with respect to the voltage on the side of the direct-current power source in accordance with the boost restriction, and wherein the maximum torque line defines a maximum torque obtained by driving the motor based on the voltage on the side of the motor drive circuit according to rotational speeds of the motor.