This study investigates sensorless position control of valveless pump-controlled hydraulic actuators for non-road mobile machinery (NRMM). The utilized hydraulic systems are direct driven hydraulics (DDH), a type of electrohydrostatic actuators (EHA), which uses an electric servomotor to drive hydraulic pumps of a single actuator. The advantages of DDH over traditional valve-controlled hydraulics are increased energy efficiency due to elimination of the valve losses and improved controllability. The servomotor driven pumps provides a possibility for sensorless position control of hydraulic cylinders without need for sensors. The sensorless position control was realized by simulating the interaction of DDH units and hydraulic cylinders of a testbed prototype hybrid mining loader. Measured data from a test work cycle was used to test the accuracy of the simulation. The results showed that accuracy with maximum error of about 30 mm could be achieved with no load and with 1000 kg load.
|Title of host publication||10th JFPS International symposium on Fluid Power, Fukuoka|
|Publisher||American Society of Mechanical Engineers|
|Number of pages||10|
|Publication status||Published - 24 Oct 2017|
|MoE publication type||D3 Professional conference proceedings|
|Event|| JFPS International Symposium on Fluid Power - Fukuoka, Japan|
Duration: 24 Oct 2017 → 27 Oct 2017
Conference number: 10
|Conference||JFPS International Symposium on Fluid Power|
|Period||24/10/2017 → 27/10/2017|
- Sensorless position control
- Virtual sensors
- Direct driven hydraulics
- Electrohydrostatic actuator
Sourander, T., Pietola, M., Minav, T., & Hänninen, H. (2017). Sensorless position control of direct driven hydraulic actuators. In 10th JFPS International symposium on Fluid Power, Fukuoka American Society of Mechanical Engineers.