Slip control device for electric vehicle
First Claim
1. An inverter device, which includes a slip control device, provided in an electric automobile including at least one electric motor unit configured to rotationally drive a drive wheel, for slip controlling the electric automobile, the slip control device comprising:
- a driven wheel rotation frequency observation module configured to observe a rotation frequency of a driven wheel;
a drive wheel rotation frequency observation module configured to observe a drive wheel rotation frequency N2 which is a rotation frequency of the drive wheel;
a torque cancellation module configured to make a torque command value to the motor unit that drives the drive wheel to be zero when a slip condition determination module determines that the drive wheel rotation frequency N2 exceeds a drive wheel maximum rotation frequency Nmax, the torque command value being based only on the observed rotation frequencies of the driven wheel and drive wheel,wherein the drive wheel maximum rotation frequency Nmax is calculated by a maximum rotation frequency calculation module configured to calculate the current drive wheel maximum rotation frequency Nmax on the basis of the observed rotation frequency N1 of the driven wheel and a set ideal slip ratio λ
according to the formula (Nmax−
N1)/N1=λ
, and the slip condition determination module is configured to determine whether the observed drive wheel rotation frequency N2 exceeds the drive wheel maximum rotation frequency Nmax.
1 Assignment
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Accused Products
Abstract
A slip control device for an electric automobile includes a maximum rotation frequency calculator to calculate a drive wheel maximum rotation frequency Nmax on the basis of a rotation frequency N1 of a driven wheel and an ideal slip ratio λmin according to the formula (Nmax−N1)/N1=λmin. It is determined whether a drive wheel rotation frequency N2 exceeds the frequency Nmax. If it is determined that the frequency N2 exceeds the frequency Nmax, a torque command value to a motor unit is made to be zero.
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Citations
8 Claims
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1. An inverter device, which includes a slip control device, provided in an electric automobile including at least one electric motor unit configured to rotationally drive a drive wheel, for slip controlling the electric automobile, the slip control device comprising:
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a driven wheel rotation frequency observation module configured to observe a rotation frequency of a driven wheel; a drive wheel rotation frequency observation module configured to observe a drive wheel rotation frequency N2 which is a rotation frequency of the drive wheel; a torque cancellation module configured to make a torque command value to the motor unit that drives the drive wheel to be zero when a slip condition determination module determines that the drive wheel rotation frequency N2 exceeds a drive wheel maximum rotation frequency Nmax, the torque command value being based only on the observed rotation frequencies of the driven wheel and drive wheel, wherein the drive wheel maximum rotation frequency Nmax is calculated by a maximum rotation frequency calculation module configured to calculate the current drive wheel maximum rotation frequency Nmax on the basis of the observed rotation frequency N1 of the driven wheel and a set ideal slip ratio λ
according to the formula (Nmax−
N1)/N1=λ
, and the slip condition determination module is configured to determine whether the observed drive wheel rotation frequency N2 exceeds the drive wheel maximum rotation frequency Nmax. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification