Method and apparatus for identifying a force exerted by a seat or closing part

An apparatus for identifying a force exerted by a seat or closing part, selected from the group consisting of a window winding system, a sunroof, a trunk lid, and a sliding door of a motor vehicle, that can be electrically adjusted by way of an electric motor on a body resting on said seat or closing part, the apparatus comprising:

• an actuation system, which is configured to apply a voltage to the motor, which voltage causes the force of the part on the body, if present, resting on said seat or closing part,
• a measurement device which is configured, while the motor is stationary, to measure a variable of the motor representing a movement of the motor, and
• a comparison device, which is configured to identify, based on the measured variable, the force exerted by the seat or closing part on the body resting on said seat or closing part,
• wherein the actuation system is configured so that a voltage whose magnitude is below a prescribed motor voltage threshold value that would be necessary in order to cause the closing part to move and/or that effects the force lower than a maximum on the body, before a variable representing the movement of the motor is measured by way of the measurement device while the motor is freewheeling.

An apparatus for identifying a force exerted by a seat or closing part, selected from the group consisting of a window winding system, a sunroof, a trunk lid, and a sliding door of a motor vehicle, that can be electrically adjusted by way of an electric motor on a body resting on said seat or closing part, the apparatus comprising:

• an actuation system, which is configured to apply a voltage to the motor, which voltage causes the force of the part on the body, if present, resting on said seat or closing part,
• a measurement device which is configured, while the motor is stationary, to measure a variable of the motor representing a movement of the motor, and
• a comparison device, which is configured to identify, based on the measured variable, the force exerted by the seat or closing part on the body resting on said seat or closing part,
• wherein the measurement device is configured so that, during freewheeling, a variable representing the movement of the motor in the form of a current flowing through the motor is measured or is ascertained from another variable, wherein, based on the current, it is determined how great the force exerted on a body resting on the seat or closing part is whether jamming is present.