| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress overheating of an electric motor, and its driving circuit in an automobile wherein the electric motor is connected to a drive shaft via a transmission. <P>SOLUTION: When a vehicle speed V is less than a predetermined vehicle speed Vref, and a motor current Im applied to the motor is a predetermined current Iref or more, basically, output torque To outputted to the drive shaft is estimated on the basis of motor torque Tm based upon the motor current Im, engagement torque Tc* is set such that the estimated torque To matches with required torque T* required in the drive shaft, a corresponding brake of the transmission is controlled by the set engagement torque Tc* (S190-S210), and the motor is controlled such that a revolution Nm of the motor matches with a predetermined rotation Nset (S220, and S230). By this, since the motor can be rotated while outputting power to the drive shaft, the current concentrates in only one particular phase of a three phase coil of the motor, and overheating of the electric motor and its driving circuit can be suppressed. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
