Method for inhibiting wheel slip in an electric alternating curr

Details Method for inhibiting wheel slip in an electric alternating curr Method for inhibiting wheel slip in an electric alternating curr

1995-06-05

1996-01-02

Graham, Matthew C.

Fluid-pressure and analogous brake systems

Speed-controlled

Traction-motor vehicle

303 20, 180 651, B60K 100

Patent

active

054802202

ABSTRACT:
A method for inhibiting wheel slip in an electric alternating current induction motor powered vehicle responsive to a frequency command signal and to a signal representative of actual motor torque for establishing a corresponding excitation frequency for the induction motor develops the frequency command signal from a torque command signal. The method compares the torque command signal to selectively variable relatively positive and negative torque command limits to develop a torque reference signal. The magnitude of the signal corresponding to actual motor torque is subtracted from the magnitude of the torque reference signal to develop a torque error signal, which error signal is then converted to a corresponding torque regulator signal. The torque regulator signal is summed with the torque reference signal to develop a motor torque signal and the motor torque signal is then converted to a corresponding frequency command signal. This method assures that motor torque does not exceed the torque which would result in slipping or sliding and thus prevents the initiation of a wheel slip or slide.

REFERENCES:
patent: 3561557 (1971-02-01), Magnuson et al.
patent: 3720863 (1973-03-01), Ringland et al.
patent: 3866702 (1975-02-01), Eastham
patent: 4075538 (1978-02-01), Plunket
patent: 4444285 (1984-04-01), Stewart et al.
patent: 4780650 (1988-10-01), Miyazaki et al.
patent: 4825131 (1989-04-01), Nozaki et al.
patent: 4896090 (1990-01-01), Balch et al.

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