System and method for controlling charging of an accumulator in an electro-hydraulic system
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United States of America Patent
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Sep 23, 2014
Grant Date -
Apr 4, 2013
app pub date -
Sep 30, 2011
filing date -
Sep 30, 2011
priority date (Note) -
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Abstract
A novel energy saving mode of charging an accumulator in an electro-hydraulic system is disclosed involving toggling the position of a fan isolation valve from the flow-passing position, where the flow is driving a fan motor thereby maintaining a fan in an on position, to the flow-blocking position where the flow is inhibited from driving the fan motor thereby causing the fan to turn off, when the time to charge an accumulator is less than the period of time that the fan may be off and still allow for the cooling requirements of the engine to be satisfied. By diverting fluid flow from driving the fan motor to charging the accumulator, the disclosed energy saving mode allows for a greater flow of fluid to be delivered to the accumulator for charging, making it possible to charge the accumulators quicker and more efficiently while maintaining the cooling requirements of the engine. The energy saving mode of operation may illustratively be used in a hystat fan and hybrid system.
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