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HYDRAULIC DRIVE SYSTEM USED IN CONSTRUCTION MACHINE AND PROVIDED WITH EXHAUST GAS PURIFICATION DEVICE
A construction machine hydraulic drive system that performs load sensing control is arranged to be capable of efficiently burning and removing deposits on a filter in an exhaust gas purifying device through pump output increasing control and to be free from faults in the pump output increasing control even when an actuator is operated during the pump output increasing control. A solenoid switching valve (70) is switched so that output pressure of an engine speed detecting valve (13) is guided to a pressure receiving portion (17d) of an LS control valve (17b) and a pressure receiving portion (15d) of an unloading valve (15) when a start of regeneration is not directed, and delivery pressure of a pilot pump (30) is guided to the pressure receiving portion (17d) and the pressure receiving portion (15d) when the start of the regeneration is directed, to thereby disable load sensing control to increase capacity of a main pump (2) and increase set pressure of the unloading valve (15).
HYDRAULIC DRIVE SYSTEM USED IN CONSTRUCTION MACHINE AND PROVIDED WITH EXHAUST GAS PURIFICATION DEVICE
A construction machine hydraulic drive system that performs load sensing control is arranged to be capable of efficiently burning and removing deposits on a filter in an exhaust gas purifying device through pump output increasing control and to be free from faults in the pump output increasing control even when an actuator is operated during the pump output increasing control. A solenoid switching valve (70) is switched so that output pressure of an engine speed detecting valve (13) is guided to a pressure receiving portion (17d) of an LS control valve (17b) and a pressure receiving portion (15d) of an unloading valve (15) when a start of regeneration is not directed, and delivery pressure of a pilot pump (30) is guided to the pressure receiving portion (17d) and the pressure receiving portion (15d) when the start of the regeneration is directed, to thereby disable load sensing control to increase capacity of a main pump (2) and increase set pressure of the unloading valve (15).
HYDRAULIC DRIVE SYSTEM USED IN CONSTRUCTION MACHINE AND PROVIDED WITH EXHAUST GAS PURIFICATION DEVICE
HYDRAULISCHES ANTRIEBSSYSTEM MIT EINER ABGASREINIGUNGSVORRICHTUNG ZUR VERWENDUNG IN EINER BAUMASCHINE
SYSTÈME D'ENTRAÎNEMENT HYDRAULIQUE UTILISÉ DANS UNE MACHINE DE CONSTRUCTION ET COMPORTANT UN DISPOSITIF DE PURIFICATION DE GAZ D'ÉCHAPPEMENT
TAKEBAYASHI YOSHIFUMI (author) / TAKAHASHI KIWAMU (author) / MORI KAZUSHIGE (author) / NAKAMURA NATSUKI (author)
2017-12-13
Patent
Electronic Resource
English
IPC:
E02F
Baggern
,
DREDGING
/
F01N
GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL
,
Schalldämpfer oder Auspuffvorrichtungen für Gase von Kraft- und Arbeitsmaschinen oder von Kraftmaschinen allgemein
/
F02D
CONTROLLING COMBUSTION ENGINES
,
Steuern oder Regeln von Brennkraftmaschinen
/
F15B
SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL
,
Druckmittelbetriebene Systeme allgemein
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