Patent ID: 11933290
Assignee: CATERPILLAR INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 6:
7. An axial piston pump having a fixed valve plate and a variable displacement comprising:
a swash plate having a variable angle of inclination in order to define a displacement of the axial piston pump;
a solenoid actuator connected to the swash plate, the solenoid actuator configured to control the angle of inclination of the swash plate in order to control the displacement of the axial piston pump; and
an axial piston pump controller configured to:
determine a displacement of the axial piston pump;
calculate a pump displacement control current to be supplied to the solenoid actuator to control the displacement of the axial piston pump comprising:
calculating a nominal value for the pump displacement control current based on a rotational speed of the axial piston pump;
calculating a pump stiffness adjustment factor based on a control map having as inputs: an output pressure of the axial piston pump; and the estimated pump displacement; and
calculating the pump displacement control current to be supplied to the solenoid actuator based on the nominal value and the pump stiffness adjustment factor; and

output an instruction to output the calculated pump displacement control current to the solenoid actuator in order to control the displacement of the axial piston pump.