Abstract:
Hybrid construction equipment leveling an engine load and effectively performing regeneration of energy is provided. For this purpose, the construction equipment includes a hydraulic pump (2) and a first electric motor (7) driven by an engine (1), a battery (9) for charging electric power generated by the first electric motor, a second electric motor (10) driven by electric power of the battery and functioning as a generator at a time of braking revolution, absorption torque detecting means (33, 34) for the hydraulic pump, and a controller (5) for controlling the first electric motor as a generator by surplus torque when absorption torque is smaller than predetermined output torque of the engine and controlling the first electric motor as a motor to generate an amount of shortage of torque when the absorption torque is larger than the predetermined torque.
Abstract:
PROBLEM TO BE SOLVED: To realize a low cost by simplifying a displacement control valve in a swash plate type variable displacement compressor in the form of varying a delivery displacement by varying a pressure in a swash plate chamber. SOLUTION: In the swash plate type variable displacement compressor, a part of fluid pressurized in a delivery chamber 28 is fed to the swash plate chamber 23 to impart a back pressure to a piston 7 and the back pressure is varied using the displacement control valve 29. A closing valve such as a two-way solenoid valve is merely used as the displacement control valve 29. If this closing valve is duty-controlled, a displacement of the compressor can be continuously varied. This compressor is used as a coolant compressor for a vehicle air conditioner and if it is constituted such that a displacement of the compressor is varied at least corresponding to an operation state of a vehicle or an engine by detecting torque of the compressor and interlocking a control device or the compressor with a control device for the vehicle or the engine, drivability of the vehicle air conditioner and a fuel consumption rate of the engine can be enhanced.
Abstract:
Die Erfindung betrifft ein Verfahren zur Detektion eines abnormalen Betriebszustands eines bei einer vorgebbaren Drehzahl ( n 0 ) betriebenen, drehzahlregelbaren Pumpenaggregats (1). Dabei wird eine Stellgröße (n soll ) des Pumpenaggregats (1) derart mit einem periodischen Anregungssignal (f A (t)) einer bestimmten Frequenz (f) beaufschlagt, dass eine hydraulische Größe ( H , Δ ρ ) des Pumpenaggregats (1) moduliert wird. Aus einer mechanischen und/ oder elektrischen Größe (P el ) des Pumpenaggregats (1) als Systemantwort (X(t)) auf das Anregungssignal (f A (t)) wird anschließend ein Auswertesignal (l(t 0 ), l(t)) berechnet und daraus ermittelt, ob ein abnormaler Betriebszustand vorliegt. Ferner betrifft die Erfindung eine Pumpenelektronik zur Steuerung und/ oder Regelung der Solldrehzahl eines Pumpenaggregats (1), die zur Durchführung des Verfahrens eingerichtet ist sowie ein Pumpenaggregat mit einer solchen Pumpenelektronik.
Abstract:
Es wird eine Kraftstoffhochdruckpumpe und ein Verfahren zur Reduzierung von Ungleichförmigkeiten der Antriebskraft der Kraftstoffhochdruckpumpe mit einer Pumpeinheit beschrieben. Die Kraftstoffhochdruckpumpe umfasst eine Pumpeinheit, eine An- triebseinheit, die die Pumpeinheit über eine Antriebskraft antreibt, ein Ventil mit einstellbarem Durchfluss, welches mit der Pumpeinheit hydraulisch gekoppelt ist, und eine Steuer- einheit zum Bestimmen der Antriebskraft und zum Steuern des Durchflusses des Ventils in Abhängigkeit der Antriebskraft.
Abstract:
본 발명은 건설기계의 유압펌프 제어 방법, 장치 및 시스템에 관한 것으로서, 엔진; 상기 엔진의 엔진 제한 토크 정보 및 엔진 현재 토크 정보를 이용하여 상기 엔진을 제어하는 엔진 제어부; 상기 엔진으로부터 공급되는 동력에 의해 작동되는 유압펌프; 상기 유압펌프로부터 토출되는 유압에 의해 구동되는 적어도 하나의 액츄에이터; 및 상기 유압펌프의 토크와 상기 엔진 제어부로부터 수신한 엔진 제한 토크 정보를 이용하여 상기 유압펌프의 제한사판각을 제어하는 유압펌프 제어 장치를 포함한다.
Abstract:
A method and system for monitoring and controlling a hydraulic pump condition. More specifically, the invention relates to a method and device for monitoring and controlling a hydraulic actuated process indirectly by monitoring and controlling an electric motor driving a positive displacement hydraulic pump. This invention also relates to a precision hydraulic energy delivery system. Direct coupling of the pump to a primary mover (motor) and related motor control allows for complete motion control of a hydraulically driven machine without the use of any downstream devices. By employing motion control algorithms in the motor control, the hydraulic output at the pump head is controlled in a feed forward method.
Abstract:
A high volume high pressure common rail (16, 17) pump (12) for a fuel system (10) includes pairs of pump head assemblies in phase with each other but oriented in opposition to one another about a rotating cam shaft (52). Pump pistons (91, 95) in the pump head assemblies simultaneously undergo pumping strokes via a shared two lobe cam (68, 69) of the rotating cam shaft (52). The pump (12) may include two pairs of pump head assemblies, and each head assembly may include two pump pistons (91, 95). The cam shaft (52) includes two cams (68, 69) sufficiently out of phase with one another that the cam shaft (52) always has a positive torque even when the cam lobes (68, 69) are symmetrical. In addition, because the pumping is done simultaneously on opposite sides of the cam shaft (52), the forces on the cam shaft (52) are balanced and its support bearings experience less wear and tear.