Electricity: motive power systems – Motor-reversing
Reexamination Certificate
1999-02-01
2001-01-16
Masih, Karen (Department: 2837)
Electricity: motive power systems
Motor-reversing
C318S445000, C318S443000, C318S450000, C318S467000, C318S468000
Reexamination Certificate
active
06175202
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a circuit for controlling an electrically activated motor vehicle door lock or the like having a lock latch and a detent pawl which keeps the lock latch in the closed position and with an electric motorized auxiliary closing drive which is turned on after the lock latch has reached a pre-closing position and then moves the lock latch, by motor, into the main closing position, there being a switch which recognizes the pre-closing position, especially a lock latch switch which scans the position of the lock latch.
2. Description of Related Art
The subject of the invention is a circuit for controlling an electrically activated motor vehicle door lock or the like, therefore also suited for other types of locks on motor vehicles such as locks on rear doors, tailgates, or trunks. The known motor vehicle door lock which forms the point of departure has a lock latch and a detent pawl which keeps the lock latch in the closed position and an electric motorized auxiliary closing drive. The latter is turned on after the lock latch has reached a preclosing position and then moves the lock latch by motor into the main closing position. The preclosing position can be the reaching of the preliminary catch or a certain position of the motor vehicle door relative to the car body, for example with a residual gap of 6 mm. A switch which recognizes the preclosing position, especially a switch which scans the position of the lock latch, delivers a corresponding starting signal to the electric motorized auxiliary closing drive (published German patent application -A- 42 18 177).
In the aforementioned prior art the circuit is made such that the lock latch, in addition to the switch which recognizes the preclosing position, is assigned to a second switch which recognizes the closed position. When the closed position is reached and the detent pawl falls into the main catch on the lock latch, this second switch causes the electric motorized auxiliary closing drive to be turned off.
SUMMARY OF THE INVENTION
The object of the invention is to devise a circuit for a motor vehicle door lock of this type or the like, which has a simpler structure. This object is achieved by the negative pole of the auxiliary closing drive always being connected to ground or negative potential and the positive pole being switched and being either at the positive potential of the vehicle voltage or at ground or is floated and by there being only one switch, the switch being between the ground and a switch terminal and causing switching of the auxiliary closing drive.
It has been recognized in accordance with the invention that a single switch which recognizes or scans the preclosing position, optionally also by a corresponding form of the lock latch, the main closing position, is enough. This need be done only in a corresponding circuit. The configurations of the invention which use as the sole additional information on the circuit state of the switch, the amount of current flowing through the electric motorized auxiliary closing drive is especially feasible.
In the following the invention is detailed using simply one drawing which shows one embodiment.
REFERENCES:
patent: 4530185 (1985-07-01), Moriya et al.
patent: 4762348 (1988-08-01), Matsumoto
patent: 4968074 (1990-11-01), Yamagishi et al.
patent: 4982984 (1991-01-01), Yokota et al.
patent: 5295720 (1994-03-01), Budde
patent: 5525875 (1996-06-01), Nakamura et al.
patent: 5944367 (1999-08-01), Imaizumi et al.
patent: 42 18 177 (1993-12-01), None
patent: 19546383 (1996-06-01), None
patent: 0 095 988 (1983-12-01), None
patent: 2 295 642 (1996-06-01), None
Kordowski Bernhard
Szablewski Piotr
Weyerstall Bernd
Masih Karen
Nixon & Peabody LLP
Robert & Bosch GmbH
Safran David S.
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