Robert T Clemmons

US Patent:

59612932, Oct 5, 1999

Filed:

Jul 29, 1996

Appl. No.:

8/681738

Inventors:

Robert T. Clemmons - Fairfield IL
Ralph E. Ulm - Fairfield IL

Assignee:

UIS, Inc - New York NY

International Classification:

F04B 4906
F04B 3504

US Classification:

417 442

Abstract:

An in-tank fuel pump apparatus includes an elongated motor-pump unit having a motor and pump unit connected in end-to-end relation. An outer cam has a substantially constant diameter enclosing the motor-pump unit and projecting axially outwardly therefrom and defining a control chamber immediately adjacent the one end of the motor-pump unit. A control tower is secured to the end of the motor-pump unit from which the motor cam extends. The control tower includes a body member having a closure plate abutting the motor pump unit, an outlet passageway extending axially from the motor-pump unit to the exterior of the motor cam, a pressure sensor secured within the body member having an inlet connected to a sensing passage connected to the output of the motor pump unit in an outermost circuit board forming the outermost end of the tower unit. An epoxy resin fills the unit about the several elements between the motor and the outer end of the cam and includes all voids within the tower structure to seal the control components against fuel and support the components as a single unitary assembly above the motor-pump unit. The tower is separately assembled as formed as a separate self-contained sub-assembly mounted within the outer housing and then with an epoxy resin introduced to fill the cavity and support all of the control, power and sensing components as a unitary complete control unit and outlet passage from the motor unit.

US Patent:

59082860, Jun 1, 1999

Filed:

May 19, 1995

Appl. No.:

8/444413

Inventors:

Robert T. Clemmons - Fairfield IL

Assignee:

UIS, Inc. - New York NY

International Classification:

F04B 4906
F04B 3504

US Classification:

417 442

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.