Method for adjusting supply pressure
AssigneePlustech Oy
InventorMarko Paakkunainen
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Abstract
The invention relates to a method for adjusting supply pressure (ps) in a hydraulic system. The method comprises a feeder pump (23) for producing the supply pressure (ps), at least two hydraulic actuators (8a, 8b, 8c), measuring means for measuring the pressure levels of the actuators (8a, 8b, 8c), and a pressurized medium flow channel system. In the method, it is examined, in which actuators (8a, 8b, 8c) the load pressure is caused by moving a load (positive work). From the pressure levels of the actuators (8a, 8b, 8c) performing load-moving work, the highest is selected, and the supply pressure (ps) is adjusted on the basis of the selected pressure level.
Claims8
A method for adjusting supply pressure in a hydraulic system comprising a feeder pump for producing the supply pressure, at least two hydraulic actuators, measuring means for measuring the pressure level of the actuators, and a pressurized medium flow channel system, wherein the method comprises at least the following steps:
- examining electrically the direction of motion of the actuator and the direction of the effect of the external moment directed at the actuator, to find out whether the actuators do positive, load moving work,
- selecting the highest of the pressure levels of actuators doing load-moving work, and
- adjusting the supply pressure on the basis of the selected pressure level.
A hydraulic system comprising a feeder pump for producing a supply pressure, at least two hydraulic actuators, measuring means for measuring the pressure levels of the actuators, and a pressurized medium flow channel system, wherein the hydraulic system also comprises:
- means for determining the actuators performing load-moving work electrically on the basis of the direction of motion of the actuator and the direction of action of an external moment effective on the actuator
- means for selecting the highest pressure level of the pressure levels of those actuators which move a load, and
- means for adjusting the supply pressure on the basis of the selected pressure level.
Dependencies are inferred from the claim text.