Method, apparatus and article for vibration compensation in electric drivetrains
First Claim
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1. A method of vibration compensation, the method comprising:
- applying a hardware limitation to a torque command to produce a torque request;
converting the torque request to a torque current value;
determining a peak of vibration;
applying an adaptation degree value to the torque current value to produce a torque current request value wherein the adaptation degree value compensates for vibrations and is based at least in part on the determined peak of vibration;
applying an electrical limitation to the torque current request value to produce a torque current reference value;
subtracting a torque current peak compensation value from the torque current reference value, wherein the torque current peak compensation value is based at least in part on the determined peak of vibration;
subtracting a torque current compensation value from the results of the subtraction of the torque current peak compensation value from the torque current reference value to produce an adjusted torque current reference value;
pulse width modulating the adjusted torque current reference value to produce pulse width modulated signals; and
providing the pulse width modulated signals to drive a power converter.
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Abstract
A torque current peak compensation value is subtracted from a torque current reference value, where the torque current peak compensation value is based at least in part on a determined peak of vibration. A torque current compensation value is subtracted from the results to produce an adjusted torque current reference value.
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Citations
11 Claims
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1. A method of vibration compensation, the method comprising:
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applying a hardware limitation to a torque command to produce a torque request;
converting the torque request to a torque current value;determining a peak of vibration; applying an adaptation degree value to the torque current value to produce a torque current request value wherein the adaptation degree value compensates for vibrations and is based at least in part on the determined peak of vibration; applying an electrical limitation to the torque current request value to produce a torque current reference value; subtracting a torque current peak compensation value from the torque current reference value, wherein the torque current peak compensation value is based at least in part on the determined peak of vibration; subtracting a torque current compensation value from the results of the subtraction of the torque current peak compensation value from the torque current reference value to produce an adjusted torque current reference value; pulse width modulating the adjusted torque current reference value to produce pulse width modulated signals; and providing the pulse width modulated signals to drive a power converter. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for controlling an alternating current machine, the system comprising:
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a torque to current conversion module configured to generate a torque current signal in response to a torque command signal; a pulse width modulation module configured to receive a reference signal and to produce a pulse width modulated signal; a vibration compensation module configured to generate a torque current compensation signal, a torque current peak compensation signal and an adaptation degree signal to compensate for vibrations based at least in part on a vibration signal, wherein the system is configured to produce the reference signal based at least in part on the torque current signal, the torque current compensation signal, the torque current peak compensation signal and the adaptation degree signal; and a multiplier configured to multiply the torque current signal by the adaptation degree signal and to produce a multiplier output signal;
an electrical limitation module configured to receive the multiplier output signal and to produce an electrical limitation output signal;
a first summer configured to subtract the torque current peak compensation signal from the electrical limitation output signal and to produce a first summer output signal; and
a second summer configured to subtract the torque current compensation signal from the first summer output signal and to produce the reference signal. - View Dependent Claims (9)
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10. A system for controlling an alternating current machine, comprising:
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means for converting a torque request to a torque current signal; means for generating a torque current peak compensation signal; means for adjusting the torque current signal coupled to the means for generating a torque current peak compensation signal and the means for converting a torque request to a torque current signal; and means for generating a pulse width modulated signal coupled to the means for adjusting torque current signal, wherein the means for adjusting the torque current signal comprises means for applying an electrical limitation and the means for generating a torque current peak compensation signal is configured to generate a torque current compensation signal, an adaptation degree signal, and a torque current peak compensation signal, wherein the means for adjusting the torque current signal is configured to;
multiply the torque current signal by the adaptation degree signal, generating a first adjusted signal;
apply the electrical limitation to the first adjusted signal, producing a second adjusted signal;
subtract the torque current peak compensation signal from the second adjusted signal, producing a third adjusted signal; and
subtract the torque current compensation signal from the third adjusted signal. - View Dependent Claims (11)
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Specification