HYBRID WORKING MACHINE

Three pressure sensors 40, 41 and 42 are provided to detect the delivery pressure of a hydraulic pump 2, the output pressure of an engine revolution speed detecting valve, and the output pressure of a differential pressure reducing valve 11 generating the differential pressure between the delivery p...

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Bibliographische Detailangaben
Hauptverfasser:	NAKAMURA NATSUKI, TAKEBAYASHI YOSHIFUMI, MORI KAZUSHIGE, TAKAHASHI KIWAMU, KISHIMOTO SHINGO
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS INVEHICLES ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OFTRANSMISSIONS IN VEHICLES ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GASEXHAUST OR FUEL SUPPLY OF PROPULSION UNITS, IN VEHICLES AUXILIARY DRIVES FOR VEHICLES BLASTING DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR DREDGING FIXED CONSTRUCTIONS FLUID-PRESSURE ACTUATORS FLUID-PRESSURE ACTUATORS, e.g. SERVO-MOTORS FOUNDATIONS HEATING HYDRAULIC ENGINEERING HYDRAULICS OR PNEUMATICS IN GENERAL INSTRUMENTATION OR DASHBOARDS FOR VEHICLES LIGHTING MECHANICAL ENGINEERING PERFORMING OPERATIONS SOIL SHIFTING SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL TRANSPORTING VEHICLES IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	Three pressure sensors 40, 41 and 42 are provided to detect the delivery pressure of a hydraulic pump 2, the output pressure of an engine revolution speed detecting valve, and the output pressure of a differential pressure reducing valve 11 generating the differential pressure between the delivery pressure of the hydraulic pump and a maximum load pressure as an absolute pressure that is then output. A vehicle controller 64 calculates virtually the displacement of the hydraulic pump 2 by use of the detected pressures and an equation of motion about a swash plate of the hydraulic pump 2, calculates the power need of the hydraulic pump 2 and the output of the engine 1 using these values, and switches a motor 60 between powering control and generation control in accordance with the result of a comparison between the pump power need and the engine output. In this manner, there is provided a hybrid working machine equipped with a hybrid system that can be mounted easily even on a small-size working machine and is capable of estimating the displacement of the hydraulic pump without using sensors to detect the tilting angle of the swash plate of the hydraulic pump.