Apparatus, method and computer program product for moving cargo, and a kit and method for upgrading an apparatus for moving cargo

A kit for upgrading an apparatus for moving cargo comprising:

• a hydraulic accumulator for storing and supplying energy;
• an energy transforming means configured to transform energy between electrical energy and potential energy of the hydraulic accumulator, wherein the energy transforming means comprises a variable displacement pump;
• and
• controller configured to
• control the transformer and the hydraulic accumulator to store electrical energy from the from the bus as potential energy to the hydraulic accumulator by the variable displacement pump supplying hydraulic fluid to the hydraulic accumulator for transforming electrical energy from the bus into potential energy of the hydraulic accumulator,
• supply the potential energy stored in the hydraulic accumulator as electrical energy,
• determine a rotational speed and displacement of the variable displacement pump for charging the hydraulic accumulator on the basis of the potential energy stored in the hydraulic accumulator,
• set the determined rotational speed to the variable displacement pump, and
• set the displacement gradually to the variable displacement pump.

A method comprising:

• providing a bus for transmission of electrical energy;
• providing at least one load connected to the bus, said at least one load configured to transform electrical energy from the bus into movement of a cargo with respect to an apparatus;
• transforming energy between electrical energy of the bus and potential energy of a hydraulic accumulator by means of a variable displacement pump;
• storing electrical energy from the bus as potential energy to the hydraulic accumulator by the variable displacement pump supplying hydraulic fluid to the hydraulic accumulator for transforming electrical energy from the bus into potential energy of the hydraulic accumulator;
• supplying the potential energy stored in the hydraulic accumulator as electrical energy to the load;
• determining a rotational speed and displacement of the variable displacement pump for charging the hydraulic accumulator on the basis of the potential energy stored in the hydraulic accumulator;
• setting the determined rotational speed to the variable displacement pump;
• and
• setting the displacement gradually to the variable displacement pump.

An apparatus comprising:

• means for providing a bus for transmission of electrical energy;
• means for providing at least one load connected to the bus, said at least one load configured to transform electrical energy from the bus into movement of a cargo with respect to an apparatus;
• means for transforming energy between electrical energy of the bus and potential energy of a hydraulic accumulator, wherein means for transforming energy comprises a variable displacement pump;
• means for storing electrical energy from the bus as potential energy to the hydraulic accumulator by the variable displacement pump supplying hydraulic fluid to the hydraulic accumulator for transforming electrical energy from the bus into potential energy of the hydraulic accumulator;
• means for supplying the potential energy stored in the hydraulic accumulator as electrical energy to the load;
• means for determining a rotational speed and displacement of the variable displacement pump for charging the hydraulic accumulator on the basis of the potential energy stored in the hydraulic accumulator;
• means for setting the determined rotational speed to the variable displacement pump;
• and
• means for setting the displacement gradually to the variable displacement pump.

A computer program embodied on a non-transitory computer readable storage medium, the computer program being configured to control an apparatus comprising:

• a bus for transmission of electrical energy;
• at least one load connected to the bus, said at least one load configured to transform electrical energy from the bus into movement of a cargo with respect to the apparatus;
• and
• energy transforming means configured to transform energy between electrical energy of the bus and potential energy of a hydraulic accumulator, wherein the energy transforming means comprises a variable displacement pump, and the computer program is configured to control the apparatus to perform a method comprising:
• storing electrical energy from the bus as potential energy to the hydraulic accumulator by the variable displacement pump supplying hydraulic fluid to the hydraulic accumulator for transforming electrical energy from the bus into potential energy of the hydraulic accumulator;
• supplying the potential energy stored in the hydraulic accumulator as electrical energy to the load;
• determining a rotational speed and displacement of the variable displacement pump for charging the hydraulic accumulator on the basis of the potential energy stored in the hydraulic accumulator;
• setting the determined rotational speed to the variable displacement pump;
• and
• setting the displacement gradually to the variable displacement pump.

A method of upgrading an apparatus for moving cargo comprising, installing to the apparatus a kit for upgrading an apparatus for moving cargo comprising:

• a hydraulic accumulator for storing and supplying energy;
• an energy transforming means configured to transform energy between electrical energy and potential energy of the hydraulic accumulator wherein the energy transforming means comprises a variable displacement pump;
• and
• a controller configured to
• control the transformer and the hydraulic accumulator to store electrical energy from the from the bus as potential energy to the hydraulic accumulator by the variable displacement pump supplying hydraulic fluid to the hydraulic accumulator for transforming electrical energy from the bus into potential energy of the hydraulic accumulator,
• supply the potential energy stored in the hydraulic accumulator as electrical energy,
• determine a rotational speed and displacement of the variable displacement pump for charging the hydraulic accumulator on the basis of the potential energy stored in the hydraulic accumulator,
• set the determined rotational speed to the variable displacement pump, and
• set the displacement gradually to the variable displacement pump.