Supercharged compressor and method for controlling a supercharged compressor

A commercial vehicle, comprising:

• an air supply system, the air supply system including a charged compressor for supplying compressed air for the commercial vehicle, the charged compressor comprising:
• a piston chamber of the compressor;
• a dead space of the compressor;
• and
• a valve unit operatively configured for either connecting the piston chamber to an entire volume of the dead space or completely separating the piston chamber from the dead space, the valve unit being further operatively configured to reduce an air volume delivered by the charged compressor to a value different from zero by activating the dead space;
• wherein
• the valve unit comprises a two-stage operable valve having a closed state, a first open state having a first opened valve cross section, and a second open state having a second opened valve cross section that is larger than the first opened valve cross section,
• the dead space is completely separated from the piston chamber when the valve unit is in the closed state,
• the dead space is partially engaged and the entire volume of the dead space is connected with the piston chamber when the valve unit is in the first open state,
• the dead space is totally engaged and the entire volume of the dead space is connected with the piston chamber when the valve unit is in the second open state, and
• the closed state, the first open state and the second open state are steady states, the first open state being maintained when an operating parameter is between two predetermined control thresholds.

A method for controlling a charged compressor supplying compressed air to a commercial vehicle, the charged compressor including a piston chamber, a dead space, and a valve unit, the valve unit comprising a two-stage operable valve operatively configured to engage the dead space, wherein the two stage operable valve has a closed state, a first open state having a first opened valve cross section, and a second open state having a second opened valve cross section that is larger than the first opened valve cross section, the method comprising the acts of:

• delivering an air volume from the charged compressor;
• and controlling the valve unit to engage an entire volume of the dead space in order to reduce the air value delivered by the charged compressor to a value differing from zero by adjusting a cross section of the opened two-stage operable valve between the piston chamber and the dead space in two stages;
• wherein
• the dead space is partially engaged and the entire volume of the dead space is connected with the piston chamber when the valve unit is in the first open state,
• the dead space is totally engaged and the entire volume of the dead space is connected with the piston chamber when the valve unit is in the second open state, and
• the closed state, the first open state and the second open state are steady states, the first open state being maintained when an operating parameter is between two predetermined control thresholds.