엔진의 시동 시에 엔진에 작용하는 부하를 경감시켜 엔진을 빠르게 시동시키고, 또한, 유압 펌프로부터 어큐뮬레이터로의 압유의 공급을 확실하게 행한다. 유압 펌프(23)와 제1 관로(28)를 개재해서 접속된 제1 어큐뮬레이터(24, 25) 및, 제1 관로(28)로부터 분기된 제2 관로(29)에 접속된 제2 어큐뮬레이터(26, 27)와, 제2 관로에 설치되고 제1 관로(28)와 제2 어큐뮬레이터(26, 27) 사이에 개재하는 개폐 밸브(32)와, 스타터(22)가 작동 상태인지 여부를 검출하는 작동 검출 수단(41)과, 엔진(21)의 회전 수를 검출하는 회전 수 검출 수단[로터리 인코더(47) 및 회전 수 산출 수단(43)]과, 작동 검출 수단(41)에 의해 스타터(22)의 작동 상태가 검출된 경우에, 회전 수가 미리 설정된 아이들링 회전 수에 도달할 때까지 동안은, 개폐 밸브(32)의 밸브 위치를 폐쇄 위치로 제어하고, 그 후는 개폐 밸브(32)의 밸브 위치를 개방 위치로 제어하는 밸브 제어 수단을 구비한다.

    An object is to reduce a load acting on an engine upon starting up the engine such that the engine can be quickly started up to reliably feed pressure oil from a hydraulic pump to an accumulator. A hydraulic control system is provided with first accumulators (24,25) connected to a hydraulic pump (23) via a first line (28) and second accumulators (26,27) connected to a second line (29) branching from the first line (28), an on/off valve (32) arranged in the second line and interposed between the first line (28) and the second accumulators (26, 27), an operation detection device (41) for detecting whether or not a starter (22) is in an operation state, a rotational frequency detection device (a rotary encoder (47) and rotational frequency calculation device (43)) for detecting a rotational frequency of an engine (21), and a valve control device for, upon detection of the operation state of the starter (22) by the operation detection device (41), controlling a valve position of the on/off valve (32) at a closed position until the rotational frequency reaches an idling rotational frequency set beforehand but then controlling the valve position of the on/off valve (32) at a closed position.


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    Title :

    HYDRAULIC CONTROL DEVICE OF WHEELED INDUSTRIAL VEHICLE


    Additional title:

    휠식 작업 차량의 유압 제어 장치


    Publication date :

    2018-09-07


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Korean


    Classification :

    IPC:    E02F Baggern , DREDGING / B60T Bremsanlagen für Fahrzeuge oder Teile davon , VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF



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