IN-TANK FUEL FUMP ASSEMBLY WITH UNITARY CONTROL UNIT FOR INTERNAL COMBUSTION ENGINES

摘要

A fuel pump assembly (1) is mounted in a fuel tank (2) for pressurized supply of fuel (3) to an internal combustion engine (4). A motor-pump unit (11) and a unitary control unit (12) are stacked within an outer can (13). Unit (11) includes an elongated motor (18) with a pump unit (17) secured to the lower end of the motor and the control unit (12) to the upper end. Pump unit (17) draws fuel through the motor and an upper outlet pipe (5) in the control unit. The unit (12) includes a support tower (22) including pipe (5) and encloses the upper end of the motor. The outer can (13) encloses the motor-pump unit and the control tower (22) which includes a sensing passageway (57') coupled to the output of the motor-pump unit, a pressure-responsive switch unit (27), solid state switch (29), supply terminals (7-7a) for controlled energization of the motor, and a control circuit board (24). A cooling member is secured within the can to cool the solid state switch (29). An encapsulating and supporting material (32) fills the can about the tower (22) and circuit board (24). The circuit board (24) includes a control circuit system with a pressure responsive input from unit (27) for controlling the motor operation and controlled delivery of fuel under pressure.