Abstract:
The present invention relates to an apparatus and method for controlling a hydraulic pump of a construction machine. The disclosed apparatus of the present invention comprises: a pump control unit which controls a discharge pressure of the hydraulic pump driven by an engine, wherein the pump control unit includes a set pressure value calculation unit which calculates a set pressure value on the basis of an engine output torque estimation value or an engine RPM; and a failure- handling unit which selects either the set pressure value and a pressure instruction value in accordance with whether or not failures of a swash plate angle sensor have occurred, and outputs the selected value. According to the present invention, the set pressure value is calculated on the basis of the engine output torque estimation value, and the pump is controlled in accordance with the calculated set pressure value. Thus, it is possible to prevent a suction torque value of the pump from exceeding the maximum torque value of the engine even upon the occurrence of failures in the swash plate angle sensor, thereby preventing engine stall even upon the occurrence of failures in the swash plate angle sensor in a high-load work condition of the engine.
Abstract:
In a method and a system for controlling a hydraulic device of a motorized vehicle the risk of stalling an engine used to power a motorized vehicle and the hydraulic device is eliminated or reduced by invoking a safety margin when controlling the hydraulic device. The current maximum torque that the engine can deliver is continuously monitored along with the current torque demand. The control signal to the hydraulic device is then controlled in response to the difference between the maximum torque and the torque demand. Hereby it is possible to invoke a suitable torque safety margin preventing the engine from stalling, which could be the result if the torque demand would exceed the maximum torque available.
Abstract:
본 발명은 건설기계의 유압펌프 제어장치 및 제어방법에 관해 개시한다. 개시된 본 발명은, 엔진에 의해 구동되는 유압펌프의 토출 압력을 제어하는 펌프 제어부를 포함하고, 상기 펌프 제어부는, 엔진 출력 토크 추정값 또는 엔진 회전수에 기초하여 압력 설정값을 산출하는 압력 설정값 산출부, 및 사판각 센서의 고장 여부에 따라 상기 압력 설정값과 압력 지령값 중 하나를 선택하여 출력하는 고장 취급부를 포함한다. 본 발명에 의하면, 압력 설정값을 엔진 출력 토크 추정값에 기초하여 산정하여 그 설정값에 따라 펌프를 제어하게 되므로 사판각 센서의 고장시에도 펌프의 흡수 토크값이 엔진의 최대 토크값을 초과하지 않도록 할 수 있으므로 엔진 고부하 작업 중 사판각 센서가 고장나더라도 엔진 시동의 꺼짐 현상이 방지되게 된다.
Abstract:
Um die Antriebsmaschine (1) bei einem Antriebsstrang zum Antrieb eines Mobil-Fahrzeugs, insbesondere einer Arbeitsmaschine, wie beispielsweise einem Radlader, in ihrem Bauvolumen zu verringern, wird zwischen der Antriebsmaschine (1) und einer hydraulischen Pumpe (5) für die Arbeitshydraulik ein stufenlos verstellbares Übersetzungsgetriebe angeordnet, welches in Abhängigkeit von dem Lastzustand der Antriebsmaschine (1) verstellbar ist.
Abstract:
Kompressor, insbesondere Klimakompressor für Kraftfahrzeuge, mit einem hubvolumenverstellbarem Triebwerk, mit einer Triebraumzuströmeinrichtung, welche einen Widerstand, insbesondere ein Ventil (15) aufweist, welches Kältemittel aus einem Auslassdruckbereich in einen Triebraum einströmen lässt, und mit einer Triebraumabströmeinrichtung, welche einen Widerstand oder ein Ventil, insbesondere eine Drossel aufweist, welche Kältemittel aus dem Triebraum in den Ansaugdruckbereich abströmen lässt.
Abstract:
A fuel injection control device (an electronic governor (12) and a controller (13)) for an engine (1) is capable of controlling the governor region to an isochronus characteristic. A working machine controller (18) receives a delivery pressure signal (P) and controls a regulator (16) in such a manner that when the delivery pressure of a hydraulic pump exceeds a predetermined pressure (P1), the displacement volume of the hydraulic pump does not exceed a value determined by a preset pump absorption torque curve (20) and when the delivery pressure of the hydraulic pump (2) is not more than a predetermined pressure (P1), the displacement volume of the hydraulic pump increases as the delivery pressure of the hydraulic pump lowers from the predetermined pressure (p1). This makes it possible, even if the governor region is controlled to an isochronus characteristic, to increase the delivery rate of the hydraulic pump as the engine load becomes lighter.