Pumps – Condition responsive control of pump drive motor – By controlling free piston internal combustion engine
Patent
1975-08-01
1978-05-02
Freeh, William L.
Pumps
Condition responsive control of pump drive motor
By controlling free piston internal combustion engine
417324, 417396, 60395, F04B 3100, F04B 3500
Patent
active
040872050
ABSTRACT:
A hybrid propulsion system, particularly for a vehicle, having a free piston type engine-pump unit connected to a working fluid circuit for controlling pressurization of a working fluid, which fluid in turn drives a hydraulic motor interconnected to the vehicle wheels. The motor-pump unit includes a free piston assembly having a pair of fixedly connected power pistons, each of which has a pump piston fixed thereto. The fluid system includes high and low pressure accumulators in communication with pumping chambers associated with the pump pistons. The power pistons are used for driving the pump pistons to pressurize the working fluid when self-sustained operation of the engine-pump unit is desired. However, the flow of working fluid to the pumping chambers can be reversed during startup of the engine so that the high pressure fluid is used for driving the free piston assembly until same is reciprocated at a rate rapidly enough to permit self-sustained reciprocation thereof.
REFERENCES:
patent: 1083568 (1914-01-01), Ungar
patent: 2077802 (1937-04-01), Martin
patent: 2382598 (1945-08-01), Andresen
patent: 2425850 (1957-08-01), Welsh
patent: 2466132 (1949-04-01), Tetreault
patent: 2831626 (1958-04-01), Perrott
patent: 2914909 (1959-12-01), Kubik
patent: 3072315 (1963-01-01), Wachsmith
patent: 3089305 (1963-05-01), Hobbs
patent: 3149773 (1964-09-01), Cudahy
patent: 3432088 (1969-03-01), Steiger
LandOfFree
Free-piston engine-pump unit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Free-piston engine-pump unit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Free-piston engine-pump unit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2156186