ELECTRIC AUTOMATIC DOOR LOCKING SYSTEM
First Claim
Patent Images
1. In a motor vehicle having a plurality of doors with each door being provided with door latching and locking mechanism, an electric automotive door locking system comprising:
- a source of power;
a solenoid control unit operatively connected to the door locking mechanism at each door of the vehicle, said solenoid control unit being responsive to an electrical signal for actuating the door locking mechanism;
an AND circuit formed by a first switch responsive to weight on a vehicle seat corresponding to the driver'"'"''"'"'s position, a second switch responsive to engagement of the vehicle transmission into a drive position, a third switch responsive to running of the vehicle engine and a fourth switch responsive to closing of the vehicle doors, each of said first, second, third and fourth switches being operative to supply a ground voltage signal;
a logical control unit electrically responsive to said AND circuit for generating said electrical signal applied to each of said solenoid control units; and
an override control for electrically actuating the door lock mechanism regardless of the state of said AND circuit;
said logical control unit comprising;
a first transistor having its emitter-collector circuit electrically connected with said AND circuit so as to be capable of coupling said AND circuit with said source of power;
a second transistor electrically connected with said solenoid control unit so as to be capable of connecting said source of power to said solenoid control unit; and
a capacitor having one side thereof connected with said first transistor and its other side connected with said second transistor, said capacitor being responsive to a voltage level change from ground for causing said second transistor to energize said solenoid control unit.
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Accused Products
Abstract
An electric automatic door locking system that is responsive to a plurality of conditions for electrically locking all the doors of a vehicle. In order for the doors to be locked, a driver must be seated in the vehicle, the vehicle engine running, the transmission engaged and the doors closed. When all of these conditions are satisfied, the doors will be automatically locked regardless of vehicle speed. Circuitry is provided to prevent overheating of the door locking solenoids once the doors are locked and remain closed.
22 Citations
5 Claims
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1. In a motor vehicle having a plurality of doors with each door being provided with door latching and locking mechanism, an electric automotive door locking system comprising:
- a source of power;
a solenoid control unit operatively connected to the door locking mechanism at each door of the vehicle, said solenoid control unit being responsive to an electrical signal for actuating the door locking mechanism;
an AND circuit formed by a first switch responsive to weight on a vehicle seat corresponding to the driver'"'"''"'"'s position, a second switch responsive to engagement of the vehicle transmission into a drive position, a third switch responsive to running of the vehicle engine and a fourth switch responsive to closing of the vehicle doors, each of said first, second, third and fourth switches being operative to supply a ground voltage signal;
a logical control unit electrically responsive to said AND circuit for generating said electrical signal applied to each of said solenoid control units; and
an override control for electrically actuating the door lock mechanism regardless of the state of said AND circuit;
said logical control unit comprising;
a first transistor having its emitter-collector circuit electrically connected with said AND circuit so as to be capable of coupling said AND circuit with said source of power;
a second transistor electrically connected with said solenoid control unit so as to be capable of connecting said source of power to said solenoid control unit; and
a capacitor having one side thereof connected with said first transistor and its other side connected with said second transistor, said capacitor being responsive to a voltage level change from ground for causing said second transistor to energize said solenoid control unit.
- a source of power;
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2. In an electric automatic door locking system according to claim 1 additionally including a diode in said AND circuit to control the discharge of said capacitor only upon opening of a vehicle door.
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3. In an electric automatic door locking system according to claim 1 whereIn said first and second transistors are of like conductivity.
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4. In an electric automatic door locking system according to claim 1 additionally including a third transistor interposed in series circuit between the other side of said capacitor and the base of said second transistor, the base of said third transistor electrically connected to said other side of said capacitor and the emitter-collector circuit of said third transistor electrically connected to the base of said second transistor controlling the conduction thereof.
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5. In an electric automatic door locking system according to claim 4 wherein said override control is electrically connected in parallel circuit with said second transistor and in series circuit with said solenoid control unit for energizing said solenoid control unit independently of said second transistor.
Specification