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US 6,407,520 B1Granted
Motor-vehicle door lock
AssigneeKiekert AG
InventorsFrank Kleefeldt, Fred Welskopf
Life of this patent
Estimating the term…
Abstract
A motor-vehicle door latch to avoid unnecessary sound emission, has its motor operated with pulse-width modulation so that, once a blockade time point is reached or prior thereto, the motor is energized with reduced power so that it generates a ramp characteristic running to a minimum. The torque and/or speed are thereby reduced along the ramp characteristic correspondingly.
Claims10
A motor-vehicle door lock comprising:
- a lock housing;
- a lock mechanism in said housing having a central locking lever displaceable between locked and unlocked positions and an actuator mechanically coupled with said lever for displacing same;
- an electric motor drive coupled with said actuator and including an electric motor;
- and
- an electric circuit connected with said electric motor for electrically energizing same for a required time interval for displacing said lever between said positions whereby said electric motor drive is blocked at a blocking point in time within or at an end of said time interval, said electric circuit having circuit elements for reducing electrical energization of said motor so that at least one of the torque and speed of said motor is reduced with time along a ramp characteristic.
2 more elements
Dependencies are inferred from the claim text.