| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve reliability on the entire system by securing safety even if there is an error in an estimated rotational position, when estimating and controlling the rotational position of a motor without using a sensor. <P>SOLUTION: When it already has acquired the information about the angle θ of a crank normally, it checks whether the difference ¾θ-ϕ¾ between the crank angle θ by a crank sensor received from an engine ECU and the estimated rotational position ϕ of the rotor of the motor is over a threshold A or not (S2). When ¾θ-ϕ¾>A, it computes the converted rotational position θ' where the delay of a communication time between the engine ECU and a motor ECU is taken into consideration, from the crank angle θ(S4). Then, it substitutes the converted rotational position θ' for the estimated rotational position ϕ of the rotor in rotation sensorless control so as to prevent the failure of rotation sensorless control (S5). Hereby, even if there is an error in the estimated rotational position of the motor, it can secure the safety and can improve the reliability on the entire system. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
