A hydraulic working machine has an assist electric motor connected to an engine and a hydraulic pump. The emissions of air pollutants in the exhaust gas from the engine are minimized regardless of fluctuations in the load torque of the hydraulic pump. A specific revolution speed suitable for reducing the emissions of air pollutants is stored, and an engine is controlled using the specific revolution speed as a target revolution speed. The absorption torque of a hydraulic pump is subjected to high-pass filtering whereby a high-frequency component devoid of a trend component is obtained. Target assist torque is computed from the high-frequency component, and the assist electric motor is subjected to power running/generation control accordingly. A specific output torque range suitable for reducing the emissions of air pollutants is stored, and the target assist torque is corrected so that the trend component does not exceed the specific output torque range.


    Access

    Download


    Export, share and cite



    Title :

    Hydraulic working machine


    Contributors:

    Publication date :

    2016-07-26


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    F15B SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL , Druckmittelbetriebene Systeme allgemein / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion / E02F Baggern , DREDGING / F02D CONTROLLING COMBUSTION ENGINES , Steuern oder Regeln von Brennkraftmaschinen



    HYDRAULIC WORKING MACHINE

    UDAGAWA TSUTOMU / SAKURAI SHIGEYUKI / SUZUKI YUKIHITO | European Patent Office | 2021

    Free access

    HYDRAULIC WORKING MACHINE

    European Patent Office | 2017

    Free access

    HYDRAULIC WORKING MACHINE

    FUJISHIMA KAZUO / KAJITA YUSUKE / SONODA MITSUO et al. | European Patent Office | 2018

    Free access

    HYDRAULIC WORKING MACHINE

    IWASAKI SATOSHI / ISHIKAWA KOUJI / SATAKE HIDETOSHI et al. | European Patent Office | 2018

    Free access

    HYDRAULIC SYSTEM OF WORKING MACHINE

    FUKUDA YUJI | European Patent Office | 2018

    Free access