Pinch detection during motor restart

A system that comprises:

• a member configured to open or close;
• a motor configured to activate the member;
• a measuring circuit configured to measure a physical quantity of the motor;
• a pitch detector comprising a processor configured to:
• in a first situation in which the member is being closed by the motor in a first closing movement but is stopped in an intermediate position, obtain a reference value of the physical quantity of the motor, the reference value representing a measured value of the physical quantity of the motor just before motor braking, the intermediate position not being a completely closed position;
• determine a threshold value by adding to or by subtracting from the reference value a margin value of the physical quantity of the motor;
• and
• in a second situation following the first situation and in which the member is moved from the intermediate position in a second closing movement, compare current measured values of the physical quantity of the motor to the threshold value to detect a pinch at the closing member;
• and
• a control apparatus configured to generate a control signal to stop movement of the member or reverse a direction of the movement of the member in response to detecting the pinch.

A method comprising:

• in a first situation in which a member is being closed by a motor in a first closing movement but is stopped in an intermediate position, obtaining a reference value of a physical quantity of the motor, the reference value representing a measured value of the physical quantity of the motor just before motor braking and measured by a measuring circuit, the intermediate position not being a completely closed position;
• determining a threshold value by adding to or by subtracting from the reference value a margin value of the physical quantity of the motor;
• and
• in a second situation following the first situation and in which the member is moved from the intermediate position in a second closing movement, comparing current measured values of the physical quantity of the motor to the threshold value to detect a pinch at the closing member.