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US 8,525,455 B2Granted
Motor actuation control device
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsNaoyoshi Takamatsu, Masaki Okamura
Life of this patent
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Abstract
A triangle wave generator (4) measures the phase difference between a triangle wave (CA) and the rotor electrical angle (θm) during a first cycle in which the rotation rate of a rotor (7) is detected, and changes the frequency of the triangle wave (CA) when the value of the phase difference between the triangle wave (CA) and the rotor electrical angle (θm) exceeds a threshold value, thereby allowing rapid response to changes in rotor rotation when PWM control is performed.
Claims3
A motor actuation control device, comprising:
- a control unit for outputting a command signal and a triangle wave to generate a PWM signal and controls the actuation of a motor by the PWM signal;
- and
- an angle sensor for detecting a rotor electrical angle,
- wherein the control unit outputs the command signal by determining a voltage value of the command signal based on the rotor electrical angle and a torque requirement value,
- calculates a rotation rate of the rotor for a first cycle based on the rotor electrical angle,
- determines a frequency of the triangle wave for the first cycle based on the rotation rate of the rotor to output the triangle wave,
- detects a phase difference between the phase angle of the triangle wave and the rotor electrical angle for a second cycle shorter than the first cycle,
- and changes the frequency of the triangle wave when the value of the phase difference between the phase angle of the triangle wave and the rotor electrical angle exceeds a predetermined threshold value.
5 more elements
Dependencies are inferred from the claim text.