Hydraulic power management system

E - Fixed Constructions – 02 – F

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E02F 9/22 (2006.01) F02D 29/00 (2006.01) F15B 11/16 (2006.01)

Patent

CA 2679998

A machine (10) having a hydraulic power management system (105). The machine includes an internal combustion engine (30) driving first and second fixed displacement pumps (95, 100) to produce a combined flow of pressurized fluid. Main (50, 55, 45) and auxiliary (57) implements are operable in response to a flow of pressurized fluid, and a control valve (90) selectively directs the combined flow to the main and auxiliary implements. A power management system (105) is operable to stop the flow of pressurized fluid to the main implement (50, 55, 45) from the second pump (100) when the pressure of the combined flow exceeds a pressure indicative of the impending engine stall. A means for providing the combined flow to the auxiliary implement without regard to the pressure of the combined flow is also provided, and may take the form of a power management override (150) or bypass mechanism (110).

L'invention concerne une machine (10) comprenant un système de gestion de puissance hydraulique (105). Ladite machine comprend un moteur à combustion interne (30) qui entraîne une première et une seconde pompes volumétriques fixes (95, 100) pour produire un écoulement combiné de fluide sous pression. Des outils principaux (50, 55, 45) et auxiliaires (57) fonctionnent en réponse à un écoulement de fluide sous pression, une soupape de commande (90) orientant sélectivement l'écoulement combiné vers les outils principaux et auxiliaires. Un système de gestion de puissance (105) fonctionne afin d'arrêter l'écoulement du fluide sous pression provenant de la seconde pompe (100) vers l'outil principal (50, 55, 45) lorsque la pression dudit écoulement combiné dépasse une pression indiquant le décrochage imminent du moteur. L'invention concerne également un moyen pour fournir l'écoulement combiné à l'outil auxiliaire indépendamment de la pression de l'écoulement combiné, ce moyen pouvant prendre la forme d'un mécanisme de neutralisation de gestion de puissance (150) ou d'un mécanisme de dérivation (110).

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