B - Operations – Transporting – 60 – K
Patent
B - Operations, Transporting
60
K
B60K 6/12 (2006.01) F16H 61/42 (2010.01)
Patent
CA 2709734
A hydraulic drive system for storing and releasing hydraulic fluid includes a high pressure storage device, a low pressure storage device, and a pump-motor operating at a range of pump-motor speeds for converting between hydraulic energy and mechanical energy. The pump-motor is disposed between the high pressure device and the low pressure device. In normal operation, the hydraulic drive system enters a motoring mode where hydraulic energy is released from the high pressure storage device and converted to mechanical energy using the pump-motor. It also enters a pumping mode where mechanical energy is converted into hydraulic energy. A neutral state exists where hydraulic energy is neither stored nor released from the high pressure storage device. An approach for compensating for temperature changes using varying pressure limits helps to maintain the hydraulic drive system in normal operation, thereby promoting efficiency within the hydraulic drive system. When the pump-motor includes a swash-plate or similar structure, compensating for drift during normal operation helps to promote efficient operation of the hydraulic drive system.
Anderson Randy
Gilbert Doug
Borden Ladner Gervais Llp
Corporation Eaton
LandOfFree
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