Patent GB-426749-A (GB)
Title: Fuel injection device for facilitating acceleration and starting of internal combustion engines
IPC: F02N99/00
Filed: 1934-04-06
Abstract: 426,749. Spray carburetters. SOC. GENERALE DES CARBURATEURS ZENITH, 10, Rue Petitot, Geneva, Switzerland. April 6, 1934, Nos. 10488 and 10489. Convention dates, April 7, 1933 and March 15, 1934. [Class 7 (iii)] A device dependent for its action upon throttle movement to inject fuel into the induction passage to facilitate accelerating and starting, comprises a chamber communicating with a space filled with liquid through an orifice of small section, said chamber having two movable walls, one of which is connected to the throttle valve while the other is connected with a valve controlling the flow of fuel through a circuit fed under pressure and delivering into the induction passage. A chamber 10, Fig. 2, communicates through a small orifice 11 and also through a larger orifice provided with a check valve 14, with a conduit 12 permanently connected with a feed conduit 7 in which the fuel is under pressure. Conduit 12 also communicates with a space 15 having an outlet port 16 connected to a nozzle 17 which delivers into the induction passage beyond the throttle and as close as possible to the inlet valves. A piston 18 in chamber 10 is connected through linkage 19 .. 21 to the throttle valve, and another piston 24 is loaded by a spring 27, its outer end serving as a valve to control the outlet port 16. A plug 29 permits of removing air from the apparatus. If the throttle be suddenly opened, the piston 18 is moved towards the left and produces a suction in chamber 10 causing piston 24 to be moved and port 16 opened. Fuel then flows to nozzle 17. Spring 27 now returns piston 24 and fuel enters chamber 10 through orifice 11 braking the return of piston 24. The time during which injection takes place is determined by the strength of spring 27 and area of orifice 11. When the throttle valve is closed, piston 18 drives fuel in chamber 10 through orifices 11, 13. The fuel may be injected through a number of nozzles 17 in the immediate vicinity of the several inlet valves of different cylinders or groups thereof. The pistons may be replaced by diaphragms as in Fig. 3, wherein a chamber 30 communicates with a space 31 through a small orifice 32 and a larger orifice 33 with check valve 34. Space 31 is connected at 35 with the fuel feed pump and at 36 with a conduit 38 leading to the injection nozzle. Chamber 30 is closed by two diaphragms 39, 40 of which 39 is actuated by the throttle through linkage 41 .. 44, and 40 is loaded by a spring 45 and carries a valve 37 controlling the outlet 36. In a modification, Fig. 4 (not shown), the check valve 34 and outlet valve 37 are arranged differently and opening of the throttle moves diaphragm 39 to the left compressing fuel in the chamber corresponding to 30, Fig. 3. In a further modification, Fig. 5, (not shown), the chamber 10, Fig. 2, communicates through the two orifices with a space containing an independent liquid under pressure, e.g. lubricating oil. It is essential that the liquid in the chamber with movable walls be free from air or gas bubbles and to ensure this, the space is closed by a movable wall, the whole of said chamber and said space constituting an entirely closed volume. Thus in Fig. 6, the device comprises five compartments 76 .. 80, and diaphragms are provided at 81, 82, 83. The fuel inlet is at 84, and the outlet, at 85, is controlled by a valve 86 on diaphragm 81 loaded by a spring 88. The throttle acts upon diaphragm 83 through a lever 96 against the action of a stronger spring 97. A small orifice is provided at 91, and a larger orifice, controlled by a check valve, at 92. Compartments 77, 80 constitute what has been called the chamber of the device, while compartment 79 constitutes the space communicating with the chamber through the small orifice 91. The chamber is filled by removing a plug 99. When the throttle valve is opened, lever 96 is withdrawn from diaphragm 83 which however is caused to follow the diaphragm by spring 97. This movement withdraws fuel from chamber 77 and causes diaphragm 81 to move to the left and open valve 86 of outlet 85.