Exhaust gas recirculation for a free piston engine

Details Exhaust gas recirculation for a free piston engine Exhaust gas recirculation for a free piston engine

2005-08-09

2005-08-09

Wolfe, Willis R. (Department: 3747)

Internal-combustion engines

Free piston

Single chamber; one piston

C123S568140

Reexamination Certificate

active

06925971

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. 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. 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. Alternatively, the piston assemblies may drive a linear alternator. The exhaust ports for each engine cylinder are sized and located to retain the desired amount of internal EGR in each cylinder without the need for exhaust valves. As an alternative, an external EGR system may supplement the internal EGR in order to obtain the desired EGR at the desired temperature.

REFERENCES:
patent: 4876991 (1989-10-01), Galitello, Jr.
patent: 6170443 (2001-01-01), Hofbauer
patent: 6343594 (2002-02-01), Koeslin et al.
patent: 2004/0244736 (2004-12-01), Creel
patent: WO 97/28363 (1997-08-01), None

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