Repinskyi S. Control system of the axial-piston variable pump with a profiled port of the combined capacity regulator spool

The research object - processes occurring in the control system of a variable axial-piston pump. The research goal consists in the improvement of static and dynamic characteristics of the variable axial-piston pump control system in flow stabilization and constant power modes through the usage of a combined flow regulator with a profiled port of the spool. Theoretical study was performed by the methods of mathematical modeling on the basis of non-linear differential equations using numerical procedures of their solution with the help of Simulink program of MatLab package. Scientific novelty of the research consists in the following: for the first time hyperbolic static characteristic was realized in the control system of a variable axial-piston pump during its operation in a constant-power mode due to the form of a profiled port of the combined flow regulator spool; mathematical model of the variable axial-piston pump control system with a profiled port of the combined flow regulator spool has been elaborated taking into account the obtained experimental dependencies of the pump faceplate resistance moment and flow rate through the profiled working port of the spool; for the first time it was determined that in the variable axial-piston pump control system the dependencies of the regulation time, oscillation and pressure overshoot on the rate of the spring for the spool with a profiled working port during variable axial-piston pump operation in the constant-power mode are of a hyperbolic character; optimization criterion of the design parameters of the combined flow regulator has been refined based on complex consideration of static and dynamic characteristics of the variable axial-piston pump control system in the constant-power and flow stabilization modes. Practical value of the work consists in the development of a new circuit of the control system for the variable pump with the combined flow regulator, in creation of the procedure for finding such parameters of the profiled port of the combined flow regulator spool that ensure constant-power mode of the variable axial-piston pump operation. Stage of implementation - the results of the thesis are accepted to be implemented at the "45 Experimental Mechanical Plant" enterprise (Vinnytsia) by the development of hydraulic drive circuit for the drum of TIGARBO concrete mixer on the basis of the developed control system for the variable axial-piston hydraulic pump with a combined flow regulator and also introduced into the educational process of VNTU. Application range - machine-building and other enterprises specializing in design and production of the equipment based on hydraulic drives for mobile machinery.