摘要:
A pump system (24) is disclosed. The pump system may have a pump (28) with a displacement that is variable, and an actuator (34) movable to adjust the displacement of the pump. The pump system may also have an electro- hydraulic valve (36) fluidly connected to the actuator and configured to control movement of the actuator, and a variable resistor (67) mechanically connected to at least one of the actuator and the pump. The variable resistor may be adjustable by movement of the at least one of the actuator and the pump to vary a current passing through the electro-hydraulic valve.
摘要:
A pump system (24) is disclosed. The pump system may have a pump (28) with a displacement that is variable, and an actuator (34) movable to adjust the displacement of the pump. The pump system may also have an electro- hydraulic valve (36) fluidly connected to the actuator and configured to control movement of the actuator, and a variable resistor (67) mechanically connected to at least one of the actuator and the pump. The variable resistor may be adjustable by movement of the at least one of the actuator and the pump to vary a current passing through the electro-hydraulic valve.
摘要:
Provided is a de-aeration device that de-aerates hydraulic fluid in a hydraulic system (10). The hydraulic fluid is controllably supplied to the de-aeration device (28) in response to one or more sensed parameters. Consequently, the de-aeration device can de-aerate fluid at strategic times during operation of the hydraulic system to prevent a decrease in system performance and prevent cavitation.
摘要:
The invention relates to a method and a device for controlling a vehicle that comprises an engine (11) arranged to drive at least one pair of half shafts (12) and to drive at least one pump (15). The pump is arranged to supply a hydraulic system (14) comprising at least a first hydraulic component (4, 5) with hydraulic oil. According to the method, the power consumed by the hydraulic system is determined. In addition, the determined consumed power is compared with a reference value, and if the detected consumed power exceeds the reference value, the maximum available power for the hydraulic system is limited. The power limitation is carried out by the maximum available movement of at least a first flow-regulating valve (16, 17, 22) in the hydraulic system being limited.
摘要:
A hydraulic control system (28) for a machine (10) is disclosed. The hydraulic control system may include a pump (38) configured to pressurize fluid, a displacement control valve (58) configured to affect displacement of the pump, and a solenoid (66) configured to bias the displacement control valve to a zero position. The hydraulic control system may also include a controller (34) in communication with the solenoid. The controller may be configured to estimate a bias current that biases the displacement control valve to the zero position, and to control the displacement control valve based on the bias current. The controller also be further configured to monitor a pump parameter of the pump, and to determine a control error associated with the pump parameter. The controller may further be configured to selectively adjust the bias current based on the control error.
摘要:
The present invention relates to a power system for a working machine, the power system comprising a transmission for driving the working machine, the transmission comprising a continuously variable gear box having a gear unit and a hydraulic variator unit; a work hydraulic circuit for controlling at least one hydraulic actuator of the working machine; wherein the hydraulic variator unit is hydraulically connected to the work hydraulic circuit to hydraulically transfer energy from the hydraulic variator unit to the work hydraulic circuit.
摘要:
The invention relates to a method and device for controlling a fluid-actuated control system, in particular for optimising post-shifting times when driving control elements (2, 3) of this type of system. The method for controlling a fluid-actuated control system having at least one pressure fluid source (1) and at least one control element (2, 3) to which a pressurised fluid can be applied, as well as a system for controlling the fluid-actuated control system (5), is characterised in that a post-shifting time control system (4) controls and/or regulates at least the duration of a post-shifting time of the at least one control element (2, 3), and takes into account at least one parameter specific to the control element, a specific mounting position of the control element (2, 3), and/or at least one operating parameter of the fluid-actuated control system and/or vehicle in order to determine the post-shifting time.
摘要:
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Durchführung eines Verfahrens zur Steuerung eines fluidbetätigten Steuersystems, beispielsweise zur Steuerung eines hydraulisch oder pneumatisch gesteuerten automatischen oder automatisierten Getriebes (15) für ein Kraftfahrzeug, mit zumindest einer Druckmittelquelle (1), zumindest zwei mit unter Druck stehendem Fluid beaufschlagbaren Stellgliedern (2, 3) sowie mit einer Steuerungsvorrichtung (5) zur Steuerung des fluidbetätigten Steuersystems. Zur Minimierung der Anzahl und des Stromverbrauchs von zeitgleich zu betätigenden Ventilen (V1 - V8) zur Ansteuerung der Stellglieder (2, 3) sowie zur Reduzierung der mechanischen Belastung der Stellglieder (1, 2) wird erfindungsgemäß ein zusätzliches Steuerungsmodul (4) genutzt, welches Signale über zumindest eine vorliegende Steuerungsaktion einliest und gemäß vorgegebener Muster und/oder Berechnungsvorschriften und/oder Modelle Signale erzeugt, welche die Beaufschlagung von nicht geschalteten Stellgliedern (2 oder 3) mit unter Druck stehendem Arbeitsfluid veranlassen.
摘要:
Load responsive system controls to vary output flow control of a system pump (10) to control the pressure differential, acting across a control orifice (14) positioned between system pump (10) and a fluid motor (15). The system controls permit variation in the level of pressure differential in response to an external control signal (46), while this pressure differential is maintained constant at each controlled level.