Sensorless position control of direct driven hydraulic actuators

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Abstract

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.

Details

Original languageEnglish
Title of host publication10th JFPS International symposium on Fluid Power, Fukuoka
Publication statusPublished - 24 Oct 2017
MoE publication typeD3 Professional conference proceedings
Event JFPS International Symposium on Fluid Power - Fukuoka, Japan
Duration: 24 Oct 201727 Oct 2017
Conference number: 10

Conference

Conference JFPS International Symposium on Fluid Power
CountryJapan
CityFukuoka
Period24/10/201727/10/2017

    Research areas

  • Sensorless position control, Virtual sensors, Direct driven hydraulics, Electrohydrostatic actuator

ID: 14806561