Patent GB-831878-A (GB)
Title: Fuel supply system for an internal combustion engine
IPC: F02D9/00
Filed: 1957-03-04
Abstract: 831,878. Starting; carburetting apparatus. HOLLEY CARBURETOR CO. March 4, 1957 [March 26, 1956], No. 7096/57. Classes 7(3) and 7(5) [Also in Group XXXV] A fuel supply system for a spark ignited engine has an intake manifold, an engine starting circuit, and fuel control means adapted to supply fuel to the engine, the fuel control means comprising a body member having an intake passage and a throttle therein, means operatively connected to the starting circuit and including thermostatically controlled means sensitive to engine temperature for supplying starting fuel in varying rates to the engine only when the starting circuit is closed, and separate means for supplying fuel at all engine speeds after the engine has started. In Fig. 1 a constant velocity pump 12 is driven by a motor 14 connected in the ignition circuit. A vane type centrifugal pump 22 rotates in accordance with engine speed and creates a pressure differential between the chamber 18 and the conduit 28 leading to the chamber 30. In lieu of the pump 22 any equivalent device responsive to engine speed to create the pressure differential may be employed. A fixed restriction 40 permits a predetermined amount of fuel to return to the tank 16. The higher pressure P3 produced by the pump 22 also exists in the conduit 46 and chamber 48. Engine intake manifold pressure is continuously admitted to the otherwise sealed bellows 50 through the conduit 52 and passage 53. Thus the bellows 50 continuously acts together with the sealed and evacuated bellows 54 through the stems 55 in rotating the arm 56 about the pivot 58 accending to absolute engine manifold pressure. Any suitable equivalent means could be substituted for the manifold pressure responsive device. From the metering orifice 72 fuel at pressure P4 passes into the chamber 76 and through conduit 78 to the chamber 80 and through the conduit 82 to the chamber 84. Thus whenever pressure P4 exceeds pressure P2 the diaphragm 34 and the valve 36 will be displaced toward the chamber 32 to open the orifice 88 and permit fuel to flow at pressure P5 through chamber 90 and conduit 92 and into chamber 94. When valve 96 opens fuel at pressure P6 flows into chamber 104 and through conduit 106 and into conduit 108 which carries metered fuel to the position of the control shown by Fig. 2. The only purpose for valve 110 is to fill the line 108 with fuel in the event that valve 36 is closed by pressure P2 when the ignition circuit is first closed. Fig. 2 is an exploded view. The body 124 has a pair of inlet passages 126 for supplying combustion air to the engine. Each intake passage 126 is formed to branch off into two separate passages 130. With this construction the usual four barrel carburetter may be removed from an engine and the body 124 may be substituted therefor. Metered fuel from the device shown in Fig. 1 passes through the line 108 and enters the line 134 at 132. When the ignition circuit is closed so that the device 10 is supplying fuel and before the engine is started the throttle plate 164 is closed and the lever 172 is therefore depressed so that the forked end of the lever does not engage the end of the stem 160. The orifice 158 is open. Metered fuel in line 140 thus passes through the chamber 142 to the line 182 and chamber 184 and then through the line 188 to a chamber 190 in the solenoid valve assembly 192. The valve assembly 186 maintains the pressure in the line 188 and chamber 190 at a predetermined value preferably about 2 p.s.i. The solenoid 206 is energized only while the starter circuit is closed. During starting fuel in the chamber 190 passes into the intake passages 130. For controlling the starting fuel a rotating valve 220 is adjusted in accordance with engine temperature by means of a thermostatic coil 226. The leak path 224a, Fig. 3, is lengthened as the engine is warmed up and less fuel will flow through the leak path 224a than when the engine is cold. When the en-- gine starts the manifold vacuum immediately increases so that the diaphragm 152 is displaced and causes the valve 156 to close the orifice 142. Fuel enters the chamber 144 through the passage 138 and passages 258. As the pressure in chamber 144 increases to a predetermined value, the needle valve 252 is moved to open thenozzle 256 so that a jet of fuel is directed upwardly against the baffle member 260. The nozzle 256 in each of the inlet passages supplies fuel to the engine at all conditions of engine operation except starting and the amount of fuel discharged is proportional to the air flow through the intake passages. Whenever the throttle plates 164 are held open the forked end 166 of the lever 170 will hold the valve 156 closed. After the engine has started and while it is still cold it is desirable to operate the engine at a fast idle which requires additional air to be admitted to the engine. This is accomplished by means of the butterfly valve 238 actuated by the thermostatic coil 226. Filtered air is drawn through the passage 236 and the passages 262 to the branch inlet passages 130 whenever the butterfly valve 238 is' open. The thermostatic coil 226 is heated by filtered air which is drawn through the stove chamber 226. Throttle lever 272 is associated with a dashpot and a diaphragm type acceleration pump 284. While the device 10 supplies fuel in accordance with engine speed and manifold pressure any other device adapted to supply liquid fuel under pressure in accordance with engine requirements (preferably in quantities proportional to the air flow to the engine) may be substituted therefor.