Electricity: motive power systems – Positional servo systems – Pulse-width modulated power input to motor
Patent
1988-04-20
1989-10-31
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Pulse-width modulated power input to motor
318434, 180 791, G05B 1128
Patent
active
048780049
ABSTRACT:
A motor-operated power steering apparatus suppresses the heating of an electric motor and its driver circuit by limiting a maximum value for a drive signal which drives the motor based on the average value of currents flowing through the motor. The motor includes an electric motor for generating an assistive force to be applied to a steering force transmitting mechanism, a detector for detecting a vehicle steering condition, a motor controlling unit responsive to a signal from the detector for producing a drive signal to control operation of the motor, a motor driver responsive to the drive signal for driving the motor, a current detector for detecting a magnitude of a current flowing through the motor and producing a signal indicating the detected magnitude of the current, an average current calculating unit for calculating an average value of currents flowing through the motor in a prescribed period of time based on the signal from the current detector, and a driving signal limiting unit for establishing an upper limit based on the average current and limiting a maximum value for the drive signal from the motor control unit below the upper limit.
REFERENCES:
patent: 4532567 (1985-07-01), Kade
patent: 4624334 (1986-11-01), Kelledes et al.
patent: 4660671 (1987-04-01), Behr et al.
Bergmann Saul M.
Honda Giken Kogyo Kabushiki Kaisha
Shoop Jr. William M.
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