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US 10,093,199 B2Granted
Vehicle and control method for vehicle
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsToshihiro Yamamoto, Kenji Yamada
Life of this patent
Estimating the term…
Abstract
When an absolute value of a rotation speed change rate of a motor is equal to or less than a threshold and an absolute value of a torque command change rate of the motor is equal to or less than a threshold, a switching angle is changed by cyclically changing a pulse type or the number of pulses as change in a pulse pattern. With this, respective order components of harmonics are dispersed, whereby it is possible to reduce the degree of prominence of a specific order component in harmonics relative to other order components.
Claims10
A vehicle comprising:
- a motor for traveling;
- an inverter configured to drive the motor through switching of a plurality of switching elements;
- a battery configured to exchange electric power with the motor through the inverter;
- and
- an electronic control unit configured to:
- generate a PWM signal of the plurality of switching elements based on a switching angle and a switching pattern at the switching angle, the switching angle being an angle based on a modulation factor of a PWM voltage based on a torque command of the motor, a voltage phase of the PWM voltage based on a torque command of the motor, and a number of pulses at a predetermined cycle of an electric angle of the motor,
- perform switching of the plurality of switching elements based on the PWM signal, and
- cyclically change the switching angle when both of a rotation speed change rate and a torque command change rate are within a predetermined range including zero, the rotation speed change rate being an amount of change in a rotation speed of the motor per unit time, the torque command change rate being an amount of change in the torque command per unit time.
5 more elements
A control method for a vehicle, the vehicle including:
- a motor for traveling,
- an inverter configured to drive the motor through switching of a plurality of switching elements,
- a battery configured to exchange electric power with the motor through the inverter, and an
- electronic control unit,
- the control method comprising:
- generating a PWM signal of the plurality of switching elements based on a switching angle and a switching pattern at the switching angle by the electronic control unit, the switching angle being an angle based on a modulation factor of a PWM voltage based on a torque command of the motor, a voltage phase of the PWM voltage based on a torque command of the motor, and a number of pulses at a predetermined cycle of an electric angle of the motor,
- performing switching of the plurality of switching elements based on the PWM signal by the electronic control unit, and
- cyclically changing the switching angle when both of a rotation speed change rate and a torque command change rate are within a predetermined range including zero by the electronic control unit, the rotation speed change rate being an amount of change in a rotation speed of the motor per unit time, the torque command change rate being an amount of change in the torque command per unit time.
5 more elements
A vehicle comprising:
- a motor for traveling;
- an inverter configured to drive the motor through switching of a plurality of switching elements;
- a battery configured to exchange electric power with the motor through the inverter;
- and an
- electronic control unit configured to generate a PWM signal of the plurality of switching elements based on:
- receiving phase currents of the motor, an electric angle of the motor, a rotation speed of the motor, and a torque command of the motor,
- converting the phase currents of the motor from a three phase to a two phase using the electric angle of the motor,
- determining a modulation factor of a PWM voltage based on a torque command of the motor, a voltage phase of the PWM voltage based on a torque command of the motor,
- setting a number of pulses at a predetermined cycle of an electric angle of the motor based on a rotational speed and the torque command of the motor,
- setting a switching angle and a switching pattern at the switching angle, the switching angle being an angle based on the modulation factor of the PWM voltage based on the torque command of the motor, the voltage phase of the PWM voltage based on the torque command of the motor, and the number of pulses at predetermined cycle of an electric angle of the motor based on a rotational speed and the torque command of the motor,
- perform switching of the plurality of switching elements based on the PWM signal to reduce lower-order harmonics or to reduce iron loss of the motor, and
- cyclically change the switching angle when both of a rotation speed change rate and a torque command change rate are within a predetermined range including zero, the rotation speed change rate being an amount of change in a rotation speed of the motor per unit time, the torque command change rate being an amount of change in the torque command per unit time.
9 more elements
Dependencies are inferred from the claim text.