Smart fuel pump controller

Details Smart fuel pump controller Smart fuel pump controller

1990-03-30

1991-10-08

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With particular 'error-detecting' means

123497, G05D 1600

Patent

active

050557580

ABSTRACT:
The motor drive circuit has an instrumentation amplifier with a programmable gain set by selectively blowing fuses during initial circuit calibration. The quasi-sawtooth waveform of a relaxation oscillator is compared with the amplified and conditioned signal produced by a pressure responsive Wheatstone bridge circuit. The result of this comparison is a drive signal which controls the pump motor speed. Radio frequency interference is minimized by storing the motor drive current in a capacitor located near the motor. Further interference is minimized by a reactive matching circuit which combines with the motor impedance to result in a purely resistive load.

REFERENCES:
patent: 3247717 (1966-04-01), Kemmer et al.
patent: 4259845 (1981-04-01), Norbeck
patent: 4596514 (1986-06-01), Matsumoto et al.
patent: 4756291 (1988-07-01), Cummins et al.
patent: 4791905 (1988-12-01), Furuta et al.
patent: 4800859 (1989-01-01), Sagisaka et al.
patent: 4904162 (1990-02-01), Suzuki

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