Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile
Patent
1996-09-30
1998-05-05
Elms, Richard T.
Electrical transmission or interconnection systems
Vehicle mounted systems
Automobile
318469, 361 30, H02P 100
Patent
active
057478848
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on an arrangement for operating an adjustment drive of the generic type having a relay-controlled change-over facility for the right-handed rotation/left-handed rotation of a positioning motor, which comprises a first semiconductor switch to supply current to a first relay winding and a second semiconductor switch to supply current to a second relay winding. An arrangement of the generic type is known from the German Patent 31 35 888 which focuses on a safety device that links the signals appearing in a transistor-controlled change-over facility for the right-handed rotation/left-handed rotation of a positioning motor such that the positioning motor is turned off reliably in the event of a fault. The prior art arrangement comprises an error detection logic which recognizes alloyed-through transistors and blocked change-over facilities, for example, a sticking of relay contacts, as being faulty.
According to a first embodiment of the prior art arrangement, the error detection logic triggers a turn-off of the positioning motor comprised in the adjustment drive in the absence of control signals at both control inputs of the two transistors and if a signal corresponding to the switching signal appears simultaneously at the output of at least one of the two transistors.
According to another embodiment of the prior art arrangement, the error detection logic also triggers a turn-off if control signals are absent at both control inputs of the two transistors and if, simultaneously, a potential corresponding to the turn-on potential is present at at least one connection of the positioning motor.
The positioning motor comprised in the adjustment drive is turned off in the event of a fault, for example, by applying a control signal to both control inputs of the two transistors so as to simultaneously turn on the right-handed rotation and left-handed rotation of the positioning motor. The simultaneous application of the control signals has the effect that the positioning motor is kept without current.
A dual relay is known from the publication of the Siemens AG, Order No. which relay includes two relay windings as well as two relay contacts. The two contacts are moved with only one movable armature. If, in the event of a fault, a relay contact is stuck, it is possible to actuate the other relay contact since the armature continues to be freely movable. The supply of current to a relay winding results in the actuation of the relay contact allocated to this winding. If a fault occurs in the actuation of the prior art relay, in which one winding is continuously supplied with current, the other relay contact can no longer be closed since the armature of that winding remains in operation which was first supplied with current.
It is the object of the invention to provide an arrangement for operating an adjustment drive which arrangement offers increased safety in the event of a fault.
SUMMARY AND ADVANTAGES OF THE INVENTION
In a circuit for operating an adjustment drive, which circuit comprises a relay-controlled arrangement for the right-handed rotation/left-handed rotation of a positioning motor as well as a first semiconductor switch to supply current to a first relay winding and a second semiconductor switch to supply current to a second relay winding, at least a third semiconductor switch is present which is connected in series with the first winding and in series with the second winding. By turning the third semiconductor switch on and off, the current flow through the relay windings is blocked or enabled. By means of the measure provided by the invention it is possible, in particular, to stop the current from flowing through the relay windings independently of the state of the control signals provided for the first two semiconductor switches as well as independently of the state of the first two semiconductor switches.
Advantageous modifications and embodiments of the arrangement according to the invention ensue are disclosed and claimed.
One advantageous embodiment provides that
REFERENCES:
patent: 4146801 (1979-03-01), Vau et al.
patent: 4477753 (1984-10-01), Ratzel et al.
patent: 5568025 (1996-10-01), Sumida et al.
patent: 5572098 (1996-11-01), Dreon et al.
patent: 5596253 (1997-01-01), Mizuta et al.
Siemens Firmenschrift; Siemens AG, Order No. A23001-G12-D006, Umpolradius (Pole-Changing Radius), TCR 1, Jul. 1994, pp. 89-94.
Spinner Klaus
Voehringer Klaus
Elms Richard T.
Robert & Bosch GmbH
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