An Investigation of Swash Plate Control Concepts for Displacement Controlled Actuators

Grabbel, Joerg; Ivantysynova, Monika

doi:10.1080/14399776.2005.10781217

Cited by 89 publications

(66 citation statements)

References 1 publication

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“…This approach, however, puts high demands on the control valve, which then dominates the dynamics. Many of the previous publications on this topic [17,40] therefore use fast servo valves. Indeed, [17] reports very high performance, but servo valves are very expensive and are unlikely to be used in series produced pumps/motors in the short term.…”

Section: Control Aspects Of Complex Hydromechanical Transmissionsmentioning

confidence: 99%

“…In the long term, one approach could be to change the design and principle of operation compared to conventional axial piston machines, see for example [12,15]. In the short term, the trend is to equip conventional machines with integrated sensors and controllers [16,17]. This gives greater freedom in the controller design, with potential performance improvements, but at the same time choosing a proper control strategy becomes more difficult.…”

Section: Control Aspects Of Complex Hydromechanical Transmissionsmentioning

confidence: 99%

“…Apart from the dynamics of the displacement actuator, the maximum flow of the actuator control valve limits the maximum speed of the actuator [17]. This non-linearity does not cause instability in secondary-controlled systems but gives overshoots and delays the response [30].…”

Section: Figure 27mentioning

confidence: 99%

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Control Aspects of ComplexHydromechanical Transmissions: with a Focus on Displacement Control

Larsson¹

2017

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This thesis deals with control aspects of complex hydromechanical transmissions. The overall purpose is to increase the knowledge of important aspects to consider during the development of hydromechanical transmissions to ensure transmission functionality. These include ways of evaluating control strategies in early design stages as well as dynamic properties and control aspects of displacement controllers, which are key components in these systems.Fuel prices and environmental concerns are factors that drive research on propulsion in heavy construction machinery. Hydromechanical transmissions are strong competitors to conventional torque-converter transmissions used in this application today. They offer high efficiency and wide speed/torque conversion ranges, and may easily be converted to hybrids that allow further fuel savings through energy recuperation. One challenge with hydromechanical transmissions is that they offer many different configurations, which in turn makes it important to enable evaluation of control aspects in early design stages. In this thesis, hardware-in-the-loop simulations, which blend hardware tests and standard software-based simulations, are considered to be a suitable method. A multiple-mode transmission applied to a mid-sized construction machine is modelled and evaluated in offline simulations as well as in hardware-in-the-loop simulations.Hydromechanical transmissions rely on efficient variable pumps/motors with fast, accurate displacement controllers. This thesis studies the dynamic behaviour of the displacement controller in swash-plate axial-piston pumps/motors. A novel control approach in which the displacement is measured with an external sensor is proposed. Performance and limitations of the approach are tested in simulations and in experiments. The experiments showed a significantly improved performance with a controller that is slightly more advanced than a standard proportional controller. The implementation of the controller allows simple tuning and good predictability of the displacement response.

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Section: Control Aspects Of Complex Hydromechanical Transmissionsmentioning

confidence: 99%

Section: Control Aspects Of Complex Hydromechanical Transmissionsmentioning

confidence: 99%

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Control Aspects of ComplexHydromechanical Transmissions: with a Focus on Displacement Control

Larsson¹

2017

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“…Position/velocity control of the DC cylinders are arranged in a cascaded structure, with the pump displacement feedback as an inner loop [7]. The closed-loop pump dynamic response can reasonably be Internal leakage across the piston seals is assumed to be only pressure dependent and external leakage is neglected.…”

Section: Pump Mode Oscillationmentioning

confidence: 99%

“…[7]. When a larger displacement is demanded, the swash plate velocity is limited by the maximum flow rate through the valve.…”

Section: Pump Mode Oscillationmentioning

confidence: 99%

Pump Mode Prediction for Four-Quadrant Velocity Control of Valueless Hydraulic Actuators

Williamson¹,

Ivantysynova²

2008

Proceedings of the JFPS International Symposium on Fluid Power

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Numerical and Experimental Vibration Study of an Axial Piston Pump with the Focus on the Hydraulic Circuit Layout

Chakroun,

Battarra,

Mucchi

et al. 2024

Mechanisms and Machine Science

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An Investigation of Swash Plate Control Concepts for Displacement Controlled Actuators

Cited by 89 publications

References 1 publication

Control Aspects of ComplexHydromechanical Transmissions: with a Focus on Displacement Control

Control Aspects of ComplexHydromechanical Transmissions: with a Focus on Displacement Control

Pump Mode Prediction for Four-Quadrant Velocity Control of Valueless Hydraulic Actuators

Numerical and Experimental Vibration Study of an Axial Piston Pump with the Focus on the Hydraulic Circuit Layout

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