A hydraulic system (1) is provided comprising a group of at least two valves (2a, 2b, 2c) connected to a bus (8), each of said valves (2a, 2b, 2c) comprising a primary memory (9a, 9b, 9c) for storing a set of parameters of the valve (2a, 2b, 2c). The service work of such a hydraulic system should be facilitated. To this end each valve (2a, 2b, 2c) comprises a secondary memory (10a, 10b, 10c) storing said set of parameters of a different valve (2b, 2c, 2a) of said group.

A hydraulic system (1) is provided comprising a group of at least two valves (2a, 2b, 2c) connected to a bus (8), each of said valves (2a, 2b, 2c) comprising a primary memory (9a, 9b, 9c) for storing a set of parameters of the valve (2a, 2b, 2c). The service work of such a hydraulic system should be facilitated. To this end each valve (2a, 2b, 2c) comprises a secondary memory (10a, 10b, 10c) storing said set of parameters of a different valve (2b, 2c, 2a) of said group.

Systems and methods for auto-commissioning first and second valve assemblies associated with an actuator in an electro-hydraulic system are disclosed. In one method, a controller performs an automatic test protocol to determine a bulk modulus over fluid volume parameter used by the controller to control the valve assemblies. In one aspect, the test protocol can include pressurizing each side of the actuator to two different pressures with one of the first and second valve assemblies and blocking the other side of the actuator with the other of the first and second valve assemblies. The bulk modulus over fluid volume parameter for each valve assembly can be calculated based on recorded fluid pressures at the actuator and consumed flow at the first and second valve assemblies.

Systems and methods for controlling valve assemblies associated with an actuator in an electro-hydraulic system are disclosed. In one method, a controller monitors hydraulic fluid flow for an actuator to identify one valve assembly connected to the actuator as a meter-in valve and another valve assembly connected to the actuator as a meter-out valve. In one aspect, the valve assembly most recently identified as the meter-in valve is controlled to maintain a pressure setpoint and the valve assembly most recently identified as the meter-out valve is controlled to maintain a hydraulic fluid flow rate. The method can also include determining whether the actuator is in a passive state or an overrunning state and controlling the valve most recently identified as the meter-in valve to maintain a first pressure setpoint when the actuator is in a passive state and to maintain a second pressure setpoint when the actuator is in an overrunning state.

Systems and methods for estimating the area ratio of an actuator in static and dynamic states are disclosed. In one aspect, a metering valve is connected to each side of the actuator. In one example, one metering valve is held closed while the other metering valve incrementally pressurizes the actuator in discrete steps. The resulting work port pressures can be used to determine the actuator area ratio. Where counterbalance valves are installed in the system, the pressurizing metering valve can be placed in a pressure control mode to obtain the desired pressure values. In one example, the ratio of flows through each metering valve is used to determine the actuator ratio.

A safety module for a process valve and a system comprising a safety module and a process valve are provided. The safety module comprises at least a first interface complementary to a first connection interface of a drive module of the process valve and a second interface complementary to a second connection interface of a process valve actuator of the process valve, such that the safety module can be retrofitted in the process valve. The safety module further comprises at least one safety valve and fluid lines provided for fluidically coupling the safety valve to the drive module and the process valve actuator of the process valve. The at least one safety valve of the safety module is configured for forced venting of the process valve in a safety case.

A system for controlling a hydraulic supply on a mobile machine comprises electronic load sensing and is configured to predictively increase the pump supply pressure PSP following a determination that a hydraulic consumer is about to be actuated. The pump supply is increased irrespective of the reported hydraulic load at the time to meet a predicted hydraulic demand of consumer. The control system may revert to a load-sensing-based control of the pump supply after a given time period or in dependence on a predefined operational parameter being met. A corresponding method of controlling a hydraulic system on a mobile machine is also disclosed.

A method for commissioning a pneumatic actuator device, which includes a pneumatic drive cylinder and a pneumatic control module mounted on the pneumatic drive cylinder, wherein a plurality of commissioning steps to be carried out for commissioning are displayed by means of a graphical display device separate from the control module, the graphical display device in particular being a tablet computer or a mobile telephone, and wherein a control module state is being transmitted from the control module to the display device via a communication link between the control module and the display device, and the commissioning steps are being displayed taking into account the transmitted control module state.

A device and method for diagnosing and configuring a hydraulic device based on a wireless local area network relates to diagnosis and configuration device technologies. The device includes a communication unit and mobile terminal. The communication unit reads hydraulic device data or changes device configuration, and process the data to generate webpage results. The mobile terminal transmits configuration requests, receives webpage results, and displays results in webpage form. The webpage results are formed by processing the acquired hydraulic device data at the communication unit side. The mobile terminal can complete the hydraulic device diagnosis and configuration, as long as it connects to the communication unit via WIFI and supports state of the art web content. The mobile terminal does not need additional installation of a matching diagnostic or configuration program, and is not limited as a specific device installed with a specific operating system; a general-purpose device may be used.

A pilot control unit is for at least one valve drive of a hydraulic valve with a valve slide. The valve slide can be adjusted by the valve drive, in order to supply hydraulic lines with hydraulic fluid through the hydraulic valve. The pilot control unit is set up to supply electronics and a power end stage for actuating an electrical actuator of the valve drive with electrical energy and operating commands and there is a parametrization module in the pilot control unit for this purpose, in which operating parameters for the operation of the at least one hydraulic valve by the valve drive thereof are stored.