Position sensing for a free piston engine

Details Position sensing for a free piston engine Position sensing for a free piston engine

2005-09-27

2005-09-27

Gimie, Mahmoud (Department: 3747)

Internal-combustion engines

Free piston

Single chamber; one piston

C123S0460SC

Reexamination Certificate

active

06948459

ABSTRACT:
A free piston engine is configured with a pair of opposed engine cylinders located on opposite sides of a fluid pumping assembly. An inner piston assembly includes a pair of inner pistons, one each operatively located in a respective one of the engine cylinders, with a push rod connected between the inner pistons. The push rod extends through an inner pumping chamber in the fluid pumping assembly and forms a fluid plunger within this chamber. Also connected between the pistons are a position sensor and a calibration position sensor that are employed to determine the position and velocity of the inner piston assembly. An outer piston assembly includes a pair of outer pistons, one each operatively located in a respective one of the engine cylinders, with at least one pull rod connected between the outer pistons. The pull rod extends through an outer pumping chamber in the fluid pumping assembly and forms a fluid plunger within this chamber. Also engaging the outer piston assembly are a position sensor and a calibration position sensor that are employed to determine the position and velocity of the outer piston assembly. The movement of the inner and outer piston assemblies during engine operation will cause the fluid plungers to pump fluid from a low pressure container into a high pressure chamber as a means of storing the energy output from the engine.

REFERENCES:
patent: 4087205 (1978-05-01), Heintz
patent: 4480599 (1984-11-01), Allais
patent: 4589380 (1986-05-01), Coad
patent: 4776166 (1988-10-01), Dixon
patent: 5540194 (1996-07-01), Adams
patent: 6135069 (2000-10-01), Fenelon et al.
patent: 6554585 (2003-04-01), Maracchi

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