Motor driven fuel pump and control system for internal combustio

Details Motor driven fuel pump and control system for internal combustio Motor driven fuel pump and control system for internal combustio

1995-05-19

1999-06-01

Freay, Charles G.

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

417 449, 417 53, 417357, 417366, 4174104, F04B 4906, F04B 3504

Patent

active

059082860

ABSTRACT:
An in-tank motor-pump unit includes a motor driven gear pump, a pressure transducer, and a control module as a single integrated package establishing fuel flow at a constant pressure by creating a pulse-modulated motor drive having a fixed "off" and a variable "on" period. A permanent magnet DC motor drives a rotary pump with the required torque operating over the specified speed range and without stalling out at low flow demand. An integrated circuit board includes an IC timing chip, operating in an astable mode, has an input connected to the transducer and an output connected to a MOSFET switch which connects the motor to a power supply. A series resistor connects an amplified voltage signal of the transducer to charge the capacitor and discharge resistor separately connects the capacitor to the input of the timing chip to generate a constant "off" period and a variable operative "on" period of the MOSFET. A slight recycle fuel flow is established with substantially equal "on" and "off" periods at substantially zero fuel flow.

REFERENCES:
patent: 3711222 (1973-01-01), Hartley
patent: 4756291 (1988-07-01), Cummins et al.
patent: 4756669 (1988-07-01), Hata
patent: 4775917 (1988-10-01), Eichhorn et al.
patent: 4926829 (1990-05-01), Tuckey
patent: 5006048 (1991-04-01), Jow
patent: 5055758 (1991-10-01), Hock
patent: 5593287 (1997-01-01), Sadakata et al.
Motorola Linear/Interface Devices, Specifications and Applications Information, no date available.

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