Supercharging arrangement with a supercharger and variable-speed drive unit

A supercharging arrangement comprising:

• an internal combustion engine including an inlet manifold;
• a supercharger having a rotational input and an output in communication with the inlet manifold, wherein the supercharger is configured to supply pressurized air at the output to the inlet manifold;
• a variable-speed drive unit having a rotational input configured to receive a rotational speed output from the internal combustion engine during operation of the supercharging arrangement and an output in communication with the rotational input of the supercharger, wherein the variable-speed drive unit has a variator in communication with the rotational input of the variable-speed drive unit and the rotational input of the supercharger and the variator operates according to a specific operating ratio during operation of the supercharging arrangement;
• and
• a control system operative to set the specific operating ratio of the variator and to calculate a target value of a control variable, wherein the control system is operative to calculate an air pressure at an outlet of the supercharger.

A supercharging arrangement comprising:

• an internal combustion engine including an inlet manifold;
• a supercharger having a rotational input and an output in communication with the inlet manifold, wherein the supercharger is configured to supply pressurized air at the output to the inlet manifold;
• a variable-speed drive unit having a rotational input configured to receive a rotational speed output from the internal combustion engine during operation of the supercharging arrangement and an output in communication with the rotational input of the supercharger, wherein the variable-speed drive unit has a variator in communication with the rotational input of the variable-speed drive unit and the rotational input of the supercharger and the variator operates according to a specific operating ratio during operation of the supercharging arrangement;
• and
• a control system operative to set the specific operating ratio of the variator and to accelerate the supercharger at a rate that is a function of an error value, or proportional to an error value, that is the difference between a target speed and an actual speed of the supercharger.