Electro-hydraulic control technology
has already been in use for some time, all control system-related developments in microelectronics can be used in hydraulics, up to and including continuous digital signal processing. The term "electro
Hydraulics
familiar types of mechanical, electric and pneumatic transmission systems. In many applications, these can be used as completely alternative or hybrid solutions, depending on the requirements. In general, the
Feedback
generally taken from a mechanical (fluid) variable using appropriate measuring devices . However, it can also be determined based on algorithms from mathematical models. Another characteristic used to distinguish
Orifice
dependent on the pressure difference and not the viscosity . The approximate flow rate through an orifice can be determined with the aid of Bernoulli's equation: The simplest orifice is washer with hole of diameter
DC solenoid
Advantages : Given corresponding design, very high switching figures are also possible, The armature can be maintained in any intermediate position without the current (the force) increasing excessively.
Filter
hydraulics than in water hydraulics because sealing gaps are used more in which hard particles of dirt can become trapped and then damage the moving surface. For this reason the critical particle size for a
Fieldbus
are available, e.g. ASI (communication and electrical control are transported on the same cable), CAN bus, Interbus, Profibus DP among others. Fieldbuses are to some extent already standardised, e.g. in
Operating mode of a control
existing interlocks. step setting mode: Operating mode for sequential control in which the sequence chain can be set to any step by the operator. inching mode: Operating mode for sequential control in which switching
Semiconductor memory
volumes of data and programs. A distinction is made between: ROM: Read-only memory. Memory content can be neither modified nor erased. Non-volatile type of memory. Programming via masks during fabrication
Controller concepts
enhanced by secondary minor loops for cascaded (multi loop) control systems or state controllers , which can lead to considerably more efficient drive characteristics ( Figure R 22 ).