Abstract: In a method for operating a motor-actuatable tailgate of a motor vehicle, the motor of which can be activated or deactivated controlledly by actuation of an actuating element of an operating element, a control unit ascertains whether the actuating element is actuated for a predetermined period of time or by a predetermined actuation sequence and at the same time a manual closing movement of the tailgate is effected. If so, a holding mode is activated on reaching the tailgate position at which the actuating element is no longer actuated, wherein the motor is short-circuited in the holding mode.

Abstract: Method for operating a DC motor, where the DC motor is supplied with a variable DC voltage via a bridge circuit from a supply voltage and formed by a first, a second, a third and a fourth controllable switch, wherein the DC voltage is varied by pulse width modulation of the control signals driving the controllable switches of the bridge circuit. A control arrangement drives the bridge circuit by pulse width modulation, after the first switch connecting the DC motor to the supply voltage has been switched off, switches on the second switch connected to a ground terminal, or vice versa. The control arrangement automatically inserts a drive pause between the first or second switch being switched off and the second or first switch being switched on, whereby a bridge circuit voltage present at the DC motor is limited by a resultant maximum settable duty cycle to a maximum value.

Abstract: A method for determining and specifying necessary closing speed of a motor-operated vehicle door at the moment of reaching an initial closure detent by means of a control unit is described. The motor current of the door motor is determined and compared with a calculated maximum current, wherein the maximum current results from a motor armature resistance measured at the start of the door movement, from a minimum supply voltage of the control unit and from an adjustable factor. If the determined current is higher than the maximum current, the value of an adaptation table is changed and a higher closing speed is specified by the control unit for the next closing movement of the vehicle door; and, if the determined current is lower than the maximum current, a lower closing speed is specified by the control unit for the next closing movement of the vehicle door.

Abstract: Method for operating a DC motor where the DC motor is supplied with a variable DC voltage via a bridge circuit from a supply voltage and formed by a first, a second, a third and a fourth controllable switch, wherein the DC voltage is varied by pulse width modulation of the control signals driving the controllable switches of the bridge circuit. A control arrangement drives the bridge circuit by pulse width modulation, after the first switch connecting the DC motor to the supply voltage has been switched off, switches on the second switch connected to a ground terminal, or vice versa. The control arrangement automatically inserts a drive pause between the first or second switch being switched off and the second or first switch being switched on, whereby a bridge circuit voltage present at the DC motor is limited by a resultant maximum settable duty cycle to a maximum value.

Abstract: A method for determining and specifying necessary closing speed of a motor-operated vehicle door at the moment of reaching an initial closure detent by means of a control unit is described. The motor current of the door motor is determined and compared with a calculated maximum current, wherein the maximum current results from a motor armature resistance measured at the start of the door movement, from a minimum supply voltage of the control unit and from an adjustable factor. If the determined current is higher than the maximum current, the value of an adaptation table is changed and a higher closing speed is specified by the control unit for the next closing movement of the vehicle door; and, if the determined current is lower than the maximum current, a lower closing speed is specified by the control unit for the next closing movement of the vehicle door.