Method and system for avoiding overheating of a vehicle subsystem

A system for an electric vehicle, comprising:

• a vehicle subsystem having a compressor with a pressure chamber, wherein the compressor is provided with a pressure chamber pressure sensor configured to measure a pressure inside the pressure chamber, a compressor rotational velocity sensor configured to measure a rotational speed of the compressor, and a volume flow sensor configured to measure a fluid volume stream of the compressor;
• wherein the vehicle subsystem is switchable between an open state in which the subsystem is open towards a connected further subsystem and a closed state in which the subsystem is closed towards the connected further subsystem;
• and
• a control module with an Extended Kalman Filter implemented thereon, which is configured to acquire a measured pressure inside the pressure chamber through the pressure chamber pressure sensor, a measured rotational speed of the compressor through the compressor rotational velocity sensor, and a measured fluid volume stream of the compressor through the volume flow sensor;
• which is configured to calculate an error between a predicted state model of the vehicle subsystem and a corresponding measured state model of the vehicle subsystem, the predicted state model comprising as parameters an estimated pressure inside the pressure chamber, an estimated ambient pressure, an estimated rotational speed of the compressor and an estimated fluid volume stream of the compressor, and the measured state model comprising as parameters the measured pressure inside the pressure chamber, the measured rotational speed of the compressor and the measured fluid volume stream of the compressor, and which is configured to process the calculated error to adjust the predicted state model, including adjusting the estimated ambient pressure, based on weighted uncertainties of the measured and estimated parameters,
• wherein the control module comprises a comparing unit configured to compare the estimated ambient pressure to a predetermined ambient pressure default value, and
• wherein the control module comprises a cut-off pressure setting unit configured to reduce a cut-off pressure target value of the vehicle subsystem by a reduction amount for a period of time, when the estimated ambient pressure is less than or equal to the predetermined ambient pressure default value;
• wherein the control module is configured to compare the measured pressure inside the pressure chamber with the cut-off pressure target value, and switch-off the compressor for a period of time, when the measured pressure inside the pressure chamber reaches or rises above the cut-off pressure target value.