Hydrostatic Transmission with Secondary Control

Open Model

This example demonstrates the use of secondary control for a hydrostatic transmission with a pressure-compensated pump and a variable-displacement motor. The transmission drives a winch that lifts a mass and acts against a viscous damper. The secondary control unit introduces closed-loop control with angular velocity feedback. It contains a servo-cylinder controlled by a proportional 4-way valve, and the servo-cylinder controls the motor's control member, which is represented by a mass, spring, and damper. The dynamic compensator in the model improves system stability.

Model

Secondary Control Unit Subsystem

Simulation Results from Scopes

Simulation Results from Simscape Logging

The plots below show the commanded and measured angular velocities of the motor and the displacement of the motor.

See Also