Patent GB-191013035-A (GB)
Title: Improvements in or relating to the Electric Lighting of Vehicles.
Inventor: GABREAU EDOUARD
IPC: H02J7/14
Filed: 1910-05-28
Granted: 1911-07-28
Abstract: 13,035. Gabreau, E. May 28. Lighting systems; regulation, automatic systems and apparatus for.-The connecting and disconnecting switch of a train-lighting system is controlled by a polarized relay, while the voltage relay of a reversible servomotor controlling a resistance in the lamp circuit is placed in series with the active portion of the lamp resistance when the battery is on charge, and directly across the lamp circuit when the battery is on discharge. The dynamo is driven through an electro-magnetic clutch, the elements of which are disengaged when the battery is fully charged, and is provided with a series of field windings and a shunt field winding containing two switches in series, of which one introduces a resistance and the other breaks the circuit when the battery is fully charged. In the arrangement shown, the polarized relay 2 consists of a shunt coil 3 on its armature, two series windings 7, 11, a shunt winding 9 connected across the generator, and a shunt winding 10 connected across the battery. The connecting and disconnecting switch 62 is provided with a winding under the control of the relay 2, and a locking-device 62<a> which keeps the switch 62 open. The circuit of the shunt field winding 20 of the generator 1 contains two switches 42, 43, the former of which controls a resistance 43<a>. The winding of the switch 42 and one of the windings of a relay 63 are connected in parallel under certain conditions across the battery 4, the energization of the winding of the switch 42 opening the switch, while the energization of one of the windings of the relay 63 closes the circuit of the winding of the switch 43 to open said switch. A. variable resistance 51 in the lamp circuit is controlled by means of a servomotor 39, the direction of rotation of which is controlled by means of a reversing-switch 38 and a voltametric relay 32. The coil 34 of the relay 32 is placed in series with a portion of the resistance 51 across the lamp circuit when the battery is on charge; but when the battery is on discharge, the coil 34 is placed directly across the lamp circuit by means of a relay 64, the winding of which is in series with a second winding on the relay 63 in the discharge circuit. The circuits of the operating- coils of the reverser 38 are broken at the ends of travel of the regulating-arm 39<1> by switches 60, 61; the circuit of one of the windings of the relay 63 and the winding of the switch 42 is completed through the winding 48 of a locking-device and a contact 49<1> when the battery is fully charged. The operation of the arrangement is as follows: -When the battery is not fully charged and the dynamo is at rest, the relay 2 and switch 62 are in the positions shown, the battery 4 supplying the lamps through a portion of the resistance 51 and the windings of the switches 63, 64; the arm 39<1> of the regulator being moved from left to right, to reduce the resistance 51 as the battery voltage falls, by means of the relay 32, reverser 38, and motor 39. When the dynamo 1 is started and attains a predetermined voltage, the relay 2 closes the circuit of the winding of the switch 62, while the locking-device 62<a> is withdrawn. The switch 62 then operates to connect the dynamo to the load circuit. When the voltage of the battery is above a predetermined value, the servomotor 39 operates to move the arm 39<1> towards the left until it bridges adjustable contacts 44, 45, by means of which the shunt windings of the switches 63, 42 are placed across the battery, the switches 42, 43 operating to open the circuit of the field winding 20 of the dynamo. Simultaneously, the electro-magnetic clutch members are disengaged, and the switch 62 operates to disconnect the dynamo. As the arm 39<1> continues to move towards the left, the switch 60 is opened, thereby breaking the circuit of the motor 39 by means of the switch 38, and the plunger 49<1> is forced back against the action of a spring to bridge the contacts 49, 50. The circuit of the windings of the switches 42, 63 is again closed through the winding 48 of a locking - device, which operates to lock the plunger 49<1> in its new position, and the dynamo field circuit is again opened. When the battery voltage falls to a predetermined value, the motor 38 moves the arm 39<1> from left to right until it bridges the contacts 44, 45, whereupon the winding 48 is short-circuited, and the circuit of the windings of the switches 42, 63 is opened as the arm 39<1> moves towards the right. When the arm 39<1> reaches its extreme right-hand position, it operates to open the circuit of the motor 39 by opening the switch 61.