Back to results
US 10,471,949 B2Granted
Automobile equipped with three-phase motor
AssigneesToyota Jidosha Kabushiki Kaisha, Aisin Aw Co., Ltd.
InventorsRyoji Sato, Masayuki Baba, Shogo Tanaka, Takuya Shimaji
Life of this patent
Estimating the term…
Abstract
With a motor in rotation, 0 is set as each of a d-axis current command and a q-axis current command, and offset learning is carried out. Then, in carrying out offset learning, a transmission is controlled such that a shift stage of the transmission falls within a low vehicle speed-side predetermined shift stage range. Thus, the rotational speed of the motor can be more reliably made high to a certain extent, and offset learning can be carried out. As a result, the accuracy of offset learning can be restrained from decreasing.
Claims7
An automobile comprising:
- a three-phase motor;
- an inverter configured to drive the three-phase motor;
- a transmission configured to transmit motive power while changing a shift stage between a rotary shaft of the three-phase motor and a drive shaft that is coupled to an axle of the automobile;
- a rotational position sensor configured to detect a rotational position of the three-phase motor;
- and
- an electronic control unit configured to:
- (i) set a d-axis current command and a q-axis current command based on a torque command of the three-phase motor,
- (ii) convert respective phase currents of the three-phase motor into a d-axis current and a q-axis current based on the rotational position of the three-phase motor,
- (iii) set a d-axis voltage command and a q-axis voltage command based on the d-axis current command, the d-axis current, the q-axis current command, and the q-axis current,
- (iv) convert the d-axis voltage command and the q-axis voltage command into respective phase voltage commands of the three-phase motor based on the rotational position of the three-phase motor,
- (v) control the inverter based on the respective phase voltage commands,
- (vi) learn an offset amount of the rotational position sensor,
- (vii) correct the rotational position detected by the rotational position sensor based on a learned offset amount,
- (viii) carry out offset learning that makes the d-axis current command and the q-axis current command equal to 0 with the three-phase motor in rotation, and learns the offset amount of the rotational position such that the d-axis voltage command based on the d-axis current command and the q-axis current command becomes equal to 0, and
- (ix) carry out learning shift control that controls the transmission such that the shift stage of the transmission falls within a low vehicle speed-side predetermined shift stage range, while carrying out the offset learning.
12 more elements
Dependencies are inferred from the claim text.