HYBRID EARTHMOVER
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United States of America Patent
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N/A
Issued Date -
Oct 4, 2007
app pub date -
Apr 2, 2007
filing date -
Apr 9, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A hydraulic hybrid powertrain system for use with an earth mover of the present invention comprises a power plant generating a high pressure fluid at an output including a variable displacement pump and automated throttle control; an energy storage system; and a drive system. The power plant includes an engine driving a hydraulic pump/motor to generate the high pressure fluid. The hydraulic pump is preferably a variable displacement pump and the system includes an automated throttle control. Together these elements maintain the system fluid pressure. A cylinder is provided within the drive system for retarding the amount of the displacement within a displacement pump to maintain system pressure. The energy storage system is an accumulator.
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