Driving force control device
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsHiroki Iguma, Akira Hibino
Life of this patent
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Abstract
A driving force control device in which, based on the rotational speed of the motor mounted on the vehicle, it is determined whether resonance occurs in the vehicle with respect to the road, and when it is determined that resonance occurs in the vehicle, the torque of the motor is limited. Only the fluctuation component of the rotation speed is extracted from the rotation speed of the motor with a band-pass filter. When limiting the torque of the motor, the torque reduction is started at the timing of 270 degrees in the phase of the waveform which regards the extracted fluctuation component as the COS waveform.
Claims2
A driving force control device comprising an electronic control unit configured to
- determine whether resonance occurs in a vehicle with respect to a traveling road, based on a rotation speed of a motor mounted on the vehicle, and
- limit torque of the motor when determination is made that the resonance occurs in the vehicle, wherein:
- only a fluctuation component of the rotation speed is extracted from the rotation speed of the motor with a band-pass filter;
- when the torque of the motor is limited, torque reduction is started at a timing of 270 degrees in a phase of a waveform in which the extracted fluctuation component is regarded as a cosine waveform;
- and
- when a timing at which the determination is made that the resonance occurs in the vehicle is 0 degrees or more and less than 270 degrees in the phase of the waveform in which the fluctuation component is regarded as the cosine waveform, the torque reduction is started at a timing when the phase becomes 270 degrees.
A driving force control device, comprising:
- an electronic control device comprising a control section and a storage section, the electronic control device being configured to acquire a rotational speed of a motor mounted on a vehicle;
- and
- a band-pass filter configured to extract a fluctuation component of the rotational speed from the rotational speed of a motor mounted on a vehicle, the extracted fluctuation component being represented by a cosine waveform, wherein
- the electronic control device is further configured to
- detect that the vehicle is traveling on an undulating road,
- determine whether the rotational speed exceeds a threshold value, in response to a detection that the vehicle is traveling on the undulating road,
- obtain a phase of the cosine waveform at a timing when a determination is made that the rotational speed exceeds the threshold value,
- determine whether the obtained phase falls within a first scope and a second scope, the first scope being from 270 degrees to less than 360 degrees, and the second scope being from 0 degrees to less than 270 degrees,
- in a case where a first determination is made that the obtained phase falls within the first scope, execute a torque reduction of the motor immediately after the first determination is made, and
- in a case where a second determination is made that the obtained phase falls within the second scope, execute the torque reduction at a timing when the phase reaches 270 degrees.
Dependencies are inferred from the claim text.