Hydrostatic transmissions are inherently low damped and stiff systems which are increasingly used for the power transmission in vehicle drivetrains. For the velocity control of hydrostatic transmissions the regulator must contribute to the damping of the system. A non-linear and a linearized model of the system are presented. LQG design is applied and the obtained regulator is implemented in different ways. The implementations are compared and discussed with respect to their merits and drawbacks. Results for evaluation and validation are obtained by means of simulation of a non-linear model and experiments in a test rig.
BownsD. E.McCandlishD.EdgeK. A.Some considerations in optimisation of a hydrostatic transmission and engine combination. First European Fluid Power Conference, Glasgow, 1973 (National Engineering Laboratory).
2.
NikolausH.Energieeinsparung und Energierückgewinnung bei hydrostatischen Antriebe. Fourth Aachener Fluidtechnisches Kolloquium, Aachen, Germany, 1980 (IHP/RWTH).
3.
RydbergK.-E.On performance optimization and digital control of hydrostatic drives for vehicle applications. PhD thesis, No. 99, Department of Mechanical Engineering, Linköping University, Sweden, 1983.
4.
HahmannW.Das dynamische Verhalten hydrostatischer Antriebe mit Servopumpe und ihr Einsatz in Regelkreisen. PhD thesis, IHP/RWTH, Aachen, Germany, 1973.
5.
WalzerW.Elektronische Steuerung und Regelung von hydrostatischen Mobilgetrieben, O + p ölhydraulik und Pneumatik, 1990, 34(6).
6.
VonnoeR.Optimisation of hydrostatic transmissions with the aid of electronics. Second Tampere International Conference on Fluid power, Tampere, Finland, 1991.
7.
HuhtalaK.LehtoE.VileniusM.MurremäkiP.The universal control electronics for the hydrostatic transmissions systems. In Third Scandinavian International Conference on Fluid powerPalmbergJ.-O.), 1993 (Division of Fluid Power Technology, Department of Mechanical Engineering, Linköping University, Sweden).
8.
RückgauerN.Entwicklungstendenzen bei hydrostatischen Antrieben in mobilen Arbeitsmaschinen, O + p ölhydraulik und Pneumatik, 1993, 37(11–12).
LenneviJ.PalmbergJ.-O.RydbergK.-E.Microprocessor control of hydrostatic transmissions adapting to driving conditions. Eleventh Aachener Fluidtechnisches Kolloquium, Aachen, Germany, 1994 (IHP/RWTH).
11.
MerrittH. E.Hydraulic control systems, 1967, John Wiley, New York).
12.
LenneviJ.RydbergK.-E.PalmbergJ.-O.Digital control of hydrostatic drives with special reference to variation in system dynamics. In Fifth Bath International Fluid Power Workshop on Circuit, component and system design (Eds BurrowsC. R.EdgeK. A.), Taunton, Somerset, 1992, School of Mechanical Engineering, University of Bath (Research Studies Press).
13.
LenneviJ.RydbergK.-E.PalmbergJ.-O.Modelling, simulation and measurements of hydrostatic drives with varied system dynamics. Third Scandinavian International Conference on Fluid powerPalmbergJ.-O.), 1993 (Division of Fluid Power Technology, Department of Mechanical Engineering, Linköping University, Sweden).
14.
FriedlandB.Control system design, an introduction to state-space methods, 1986, McGraw-Hill, New York).
15.
GunnarssonS.KrusP.LQG control of a hydraulic actuator with a flexible mechanical load. Technical report LiTH-ISY-1209, Department of Electrical Engineering, Linköping University, Sweden, 1991.
16.
MATLAB Control Systems Toolbox, user's guide, 1993 (The Math Works Inc.).
17.
HOPSAN a simulation package, user's guide. LiTH-IKP-R-704, Division of Fluid Power Technology, Department of Mechanical Engineering, Linköping University, Sweden, 1991.
18.
KrusP.JanssonA.PalmbergJ.-O.WeddfeltK.Distributed simulation of hydromechanical systems. In Third Bath International Fluid Power Workshop on Computers influid power (Eds BurrowsC. R.EdgeK. A.), Taunton, Somerset, 1990, School of Mechanical Engineering, University of Bath (Research Studies Press).
19.
JanssonA.LenneviJ.PalmbergJ.-O.Modelling, simulation and control of a load simulator for hydrostatic transmissions. Third Scandinavian International Conference on Fluid powerPalmbergJ.-O.), 1993 (Division of Fluid Power Technology, Department of Mechanical Engineering, Linköping University, Sweden).
20.
KrusP.GunnarssonS.LQG control of a flexible mechanical structure using hydraulic actuators. In Sixth Bath International Fluid Power Workshop on Modelling and simulation (Eds BurrowsC. R.EdgeK. A.), Taunton, Somerset, 1993, School of Mechanical Engineering, University of Bath (Research Studies Press).
