Abstract
Architecture modeling, simulation, and test verification are performed to meet the requirements of multi-domain modeling and simulation of tractor power shift transmission (PST). The principles of architecture modeling and high level architecture (HLA) are analyzed, and the PST architecture modeling connotation and simulation system structure are studied. Then the dynamic principles of PST mechanical, hydraulic and control subsystems are analyzed in the preparation phase, sliding friction phase and holding phase of clutch engagement. To build the PST system simulation model, the simulation models and components of the three subsystems are established, and the object and interaction classes of the simulation object model (SOM) for each component are defined. After that, the parameter mapping relationship between the components is analyzed, the interfaces between the simulation components and HLA are encapsulated, and the simulation component running sequence is analyzed. Finally, the PST clutch engagement law under tractor shift conditions is simulated and tested. The relative error and correlation coefficient between the simulated and test data of shift solenoid valve drive current are used as indexes to evaluate the PST system simulation model. The results show that the simulated drive current curves are consistent with the test ones. The maximum error between the simulated and test shift time appears at the third gear downshift point, with a value of 7.89%, and the minimum correlation coefficient value between the simulated and the test drive current at all shift points is 0.92, which indicate that the PST system simulation model is effective and accurate.
Highlights
The tractor power shift transmission (PST) is a mechanical, electrical, and hydraulic integrated system that integrates advanced technologies in many fields, such as machinery, hydraulics, and control
1) The PST architecture modeling and high level architecture (HLA)-based PST simulation system structure were analyzed based on architecture modeling and HLA principles
2) The simulation models of PST mechanical, hydraulic and control subsystems were established based on the analysis of PST system dynamics principles
Summary
The tractor power shift transmission (PST) is a mechanical, electrical, and hydraulic integrated system that integrates advanced technologies in many fields, such as machinery, hydraulics, and control. B. PST HYDRAULIC SIMULATION COMPONENT The PST hydraulic simulation component outputs hydraulic parameters for the system simulation model, including the hydraulic oil flow of the shift solenoid valve, piston displacement and speed, clutch friction plate pressure, pulse width modulation (PWM) cycle and duty cycle. The drive current that controls the clutch A and the pressure in piston chamber continue to decrease until the transmission torque drops to a sliding stop. During this phase, the piston displacement is zero, and the force and transmission torque of clutch A still satisfy the relational equations (14) and (15). The drive current that controls the clutch B and the pressure in piston chamber continue to rise until the transmission torque exceeds the load In this phase, the piston displacement is zero. The Hydraulic interaction class is consistent with the Mechanical one
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
