Creeping motion
Control process required in a mobile hydraulic drive system — with a specific (mechanical or electronic) relationship between the accelerator pedal position and the movement velocity — where a particular [...] brake if the creep pedal is used to cancel the brake pressure (again via the pivoting angle associated with the pump).
Delivery flow pulsation
Pumps with a finite number of displacement units (pistons, vanes, teeth) deliver a flow rate that fluctuates around an average value due to the periodic change between the suction and pressure phase. The [...] average value is larger, the smaller the number of displacement units (Figure F 27) . Here piston pumps with an even number of pistons have double delivery flow pulsation (select odd number of pistons!) If the
Closed loop synchronisation control
Closed loop position control system with several actuators that move synchronously. In control systems there are various ways of realising this action: in the simple form the first actuator can be open [...] drive element. It is also possible to use closed loop control for all drives and to operate them with the same setpoint. In addition, the differences between the position actual values (synchronisation
Nominal size
technology are key variables which do not refer to units or dimensions and do not have to be associated with any numerical variable for these devices. Specifically, the nominal size for pumps and motors as per [...] are no standard specifications for valves. It has become normal practice to link the nominal size with the size of the connecting bore. However, it tells us nothing, for example, about the maximum or
Integrated control
Increasingly, individual devices are tending to feature internal with a view to preserving or improving certain characteristics. Typically with integrated controls, the controlled variable tends be an auxiliary
Solubility of gas in a hydraulic fluid
characteristic of dissolving certain amounts of gases. In mineral oil this ability increases linearly with pressure up to approx. 300 bar. Dalton's law states: V G = dissolved gas volume at the reference pressure [...] absolute pressure p o = reference pressure (atmospheric pressure). The saturation state characterised with this law does not of course always have to be reached. At atmospheric pressure 1 l of oil contains
Open loop control system
technology this is often a cylinder with a connected load, the second subsystem is the immediately upstream control device, for example a proportional directional valve with its electronic activation amplifier
Indirect actuation
devices (Figure I 5 a) . Another advantage is the more favourable p/Q behaviour associated with pressure valves , with pressure increasing more gradually as the flow increases (b) ( pilot actuation ). In addition
Rodless cylinder
As a result, these cylinders have an ideal short installation length just greater than the stroke. With the pistons not having any piston rod, both piston sides are the same size, making it easy to insert [...] whereby a slotted cylinder tube is sealed using steel sealing bands (Figure K 21 c) . The cylinder with actuating band or cable (a and b) is based on closed cylinders, which gives it a somewhat thicker
Final controlling device
controlling device with memory is present if the device remains in the most recently assumed position as long as the control device does not issue an output signal. Final controlling devices with adhesion behaviour [...] Combination of the actuator and the it mechanically actuates ( Figure S 82 ) (DIN 19 226). Starting with an from the control device, the final controlling device intervenes in a mass flow and/or an energy