Development and Implementation of an Advanced Power Management Algorithm for Electronic Load Sensing on a Telehandler
Rico Hjerm Hansen, Torben Ole Andersen, Henrik Clemmensen Pedersen · VBN Forskningsportal (Aalborg Universitet) · 2010
The relevance of electronic control of mobile hydraulic systems is increasing as hydraulic components are implemented with more electrical sensors and actuators. This paper presents how the traditional Hydro-mechanical Load Sensing (HLS) control of a specific mobile hydraulic application, a telehandler, can be replaced with electronic control, i.e. Electronic Load Sensing (ELS). The motivation is the potential of improved dynamic performance and power utilization, along with reducing the mechanical complexity by moving traditional hydro-mechanical implemented features such as pressure control, flow-sharing, prioritization of steering, anti-stall and high pressure protection into electronics. In order to implement these features, the paper presents and tests a general power management algorithm for a telehandler. The algorithm is capable of implementing the above features, while also handling the dynamics of the system, taking into account saturation phenomena as flow limitation and cylinder endstops. The development of control for a variable-displacement axial piston pump using a three-way servo valve is also treated.