Patent ID: 11965406
Assignee: SOILMEC S.P.A.
Field: Civil engineering (Other fields)
Classification: CPC E  F | IPC E  F

Claim 8:
9. A method for controlling an excavating machine, wherein the excavating machine comprises:
an actuation unit for moving an excavator;
a main winch connected, through a main line, to the actuation unit, for lifting and lowering said actuation unit;
a secondary winch connected, through at least one secondary line, to the actuation unit, for lifting and lowering said actuation unit;
a primary driving circuit, which is a closed hydraulic circuit or an electric circuit, for driving the main winch;
an open hydraulic circuit for driving the secondary winch; the method comprises the steps of:
measuring the pressure of a fluid or, respectively, intensity of an electric current, circulating in said primary driving circuit for driving the main winch;
measuring the pressure of a fluid circulating in said open hydraulic circuit for driving the secondary winch;
executing a combined operating condition, wherein the main winch and the secondary winch apply a force simultaneously to lift said actuation unit;
based on sensed values, regulating the pressure of the fluid in the open hydraulic circuit so that, during the combined operating condition, said pressure takes a target value that is a function of: the pressure of the fluid in the closed hydraulic circuit or, respectively, the electric current in the electric circuit;
wherein the following steps are carried out at predefined time intervals:
measuring the pressure of the fluid in the open hydraulic circuit;
measuring the pressure of the fluid in the closed hydraulic circuit or, respectively, the current in the electric circuit:
regulating the pressure of the fluid in the open hydraulic circuit to bring the pressure to the target value; and

wherein the target pressure value is calculated with one of the following formulae:

Ptarget=Pprinc×(100−R)/100+Ppd×R/100

Ptarget=Iprinc×k×(100−R)/100+Ppd×R/100

wherein R is a coefficient that is indicative of physical characteristics of the main winch and the secondary winch; and k is a predetermined coefficient.