GB714662A - Improvements relating to means for regulating the supply of fuel to internal combustion engines - Google Patents

Abstract

714,662. Retractive switches. LICENCIA TALALMANYOKAT ERTEKESITO VALLALAT. Sept. 19, 1952 [Sept. 20, 1951], No. 23596/52. Class 38(5) [Also in Group XXVII] An electrically actuated valve regulating the fuel flow to a carburetter nozzle is controlled by a switch A, Fig. 4, actuated by the throttle valve operating mechanism. The switch A forms a resilient connection in the operating linkage 10, 11, of the throttle valve 2 the spindle 3 of which carries a pulley co-operating with a tensioned cord to form a friction brake which holds the throttle valve in any set position. The accelerator pedal 8 is connected to the rod 10 which carries a member 15 slidable between stops 19, 20 in a casing 16 attached to the throttle valve operating rod 11. The member 15 carries a contact strip 21, co-operating with contacts 23, 24 and connected by a lead 22 to a dynamo, and is resiliently connected to the casing 16 through a plate 18 and spring 17. In the part-open throttle position shown in Fig. 4 the strip 21 is adjacent the contact 24 leading to a centre tapping of the valve actuating solenoid whereby part of the solenoid is energized to move the fuel valve to a partly closed position. If the accelerator pedal is depressed, the member 15 first moves to the right to take up the lost motion between the parts 15, 16, whereby the solenoid circuit is broken and the fuel valve is fully opened prior to the opening of the throttle valve which occurs when the member 15 contacts the stop 20 and transmits the movement of the pedal 8 to the casing 16 and rod 11. In this position the strip 21 may be arranged to engage a contact 25 to energize a solenoid which adjusts a distributer 48 to retard the ignition. When the pedal 8 is released the member 15 moves with lost motion to the left until the projection 10a contacts the plate 18 in which position the strip 21 again engages the contact 24 to energize part of the fuel valve solenoid and move the valve 31 to reduce the fuel supply. Subsequent movement of the pedal 8 and member 15 is transmitted to the casing 16 and rod 11 through the spring 17 to close the throttle valve, the spring 17 being powerful enough to overcome the friction brake on the throttle valve. When the throttle valve 2 is completely closed, further movement of the pedal 8 to its rest position causes compression of the spring 17 and additional lost motion of the member 15 until the strip 21 engages the contact 23 which puts the whole of the fuel valve solenoid in circuit with the dynamo 46. If the engine speed then rises above idling speed the fuel valve completely shuts off the fuel.