0
Research Papers

Generic Modeling and Control of an Open-Circuit Piston Pump—Part II: Control Strategies and Designs

[+] Author and Article Information
Shu Wang

Eaton Corporation,
14615 Lone Oak Road,
Eden Prairie, MN 55344
e-mail: Shw750@mail.usask.ca

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received January 27, 2015; final manuscript received January 6, 2016; published online February 15, 2016. Assoc. Editor: Kevin Fite.

J. Dyn. Sys., Meas., Control 138(4), 041005 (Feb 15, 2016) (10 pages) Paper No: DS-15-1051; doi: 10.1115/1.4032554 History: Received January 27, 2015; Revised January 06, 2016

Hydromechanical compensators are often integrated with piston-type pumps to produce various control behavior, for example, pressure, load-sensing, power, or torque control. Various hydromechanical mechanisms (e.g., spring forces and load pressure) are found in the industry to ensure the desired effect of the system outputs: swash angle, discharge pressure, and input torque following the reference inputs. In a companion paper (Part I of this paper), a generic linearized state-space model is derived to investigate the pump dynamics and determine the design criteria and parameters. In the study, the state-space equations are used to propose and define the generic compensating control pump to conduct the similar strategies as hydromechanical pumps do. The different control purposes (pressure/flow/power compensating) are accomplished by only manipulating the generic regulate inputs given by an electrical proportional control valve. In the open-circuit pump, the generic controllers are proposed to generate these inputs by using one unique mechanical and electronic architecture to establish various purposes of flow, pressure, torque desired control, and even more control objectives. The controller is developed in accordance with the state-space representation and by following the models of the hydromechanical compensators that can facilitate the correlation verification. The proposed controllers are able to offer more intelligent and cost-saving control strategies for open-circuit piston pumps. To achieve the similar performance as hydromechanical compensators do and implement the comparative study, control gains and settings in the controller can be determined from ones that hydromechanical compensators have. The difference is that electronic signals (swash plate position, pressure, etc.) work as feedbacks together with other control gains to regulate the input signals. For the different control purposes, control gains are able to be set conveniently for the various control operating conditions with combining the certain feedbacks on the same hardware platform that will be value efficient and capable of control intelligence. In the paper, results of predictions made by the model are presented and compared with some experimental data of hydromechanical designs. Further work on the advanced model-based control and estimation is anticipated to be addressed.

Copyright © 2016 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 1

Proposed generic compensator

Grahic Jump Location
Fig. 9

Load-sensing compensator

Grahic Jump Location
Fig. 8

Simulated spool displacement for pressure compensation mode

Grahic Jump Location
Fig. 7

Experimental and simulated control pressure for pressure compensation mode

Grahic Jump Location
Fig. 6

Experimental and simulated discharge pressure for pressure compensation mode

Grahic Jump Location
Fig. 5

Experimental and simulated swash plate angle for pressure compensation mode

Grahic Jump Location
Fig. 4

Schematics of the test stand for the open-circuit pump [14]

Grahic Jump Location
Fig. 3

Proposed generic pressure control pump block diagram

Grahic Jump Location
Fig. 2

Hydromechanical pressure compensator

Grahic Jump Location
Fig. 16

Proposed generic torque limiting control block diagram

Grahic Jump Location
Fig. 17

Experimental and simulated torque limiting performance curves

Grahic Jump Location
Fig. 10

Proposed generic load-sensing control block diagram

Grahic Jump Location
Fig. 11

Experimental and simulated swash angle with load-sensing control

Grahic Jump Location
Fig. 12

Experimental and simulated discharge and load pressure with load-sensing control

Grahic Jump Location
Fig. 13

Experimental and simulated control pressure with load-sensing control

Grahic Jump Location
Fig. 14

Simulated spool displacement with load-sensing control

Grahic Jump Location
Fig. 15

Hydromechanical torque limiting control

Tables

Errata

Discussions

Related

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In