Integrated safety in closed-loop controlled electro-hydraulic drives
Research Task/Objectives
The objective is to develop new safety concepts for controlled fluid power drives in stationary applications. By integrating safety functions into the drives, the costs are minimized. Additional redundant sensors are to be avoided due to space and cost limitations. Various diagnosis methods will be tested for the safety-related applicability. Safety functions are supposed to be selectable and available in a parametric form. Fundamentals are established in order to be able to develop future safety-related all-in-one solutions that may be used in safety-related applications. This makes fluidpower more attractive for drive systems.
Approach/Results
A specific sample machine presents the framework for the studies and validations. Based on a hazard and risk evaluation of the machine, necessary safety measures and requirements are defined. A concept for the safety function “Safely-limited Speed” regarding the design of safety-related parts of the control was developed and evaluated according to the EN ISO 13849 probability approach. With the developed requirements for the control valve and the error detection, the basics for integrating safety functions into electro-hydraulic drives were created. The integration of safety functions into the drive reduces the number of devices and shortens the error detection and reaction time.
New safety concept for controlled electro-hydraulic drives
| The contribution is based on the project "Integrated Safety in Closed-Loop Controlled Electro-Hydraulic Drives" initiated and financed by the Forschungsfonds Fluidtechnik within VDMA (FKM No. 702390). |