Patent GB-1170109-A (GB)
Title: A Supercharging System for an Internal Combustion Engine.
Inventor: SALMON BENJAMINE JEAN MARCEL
IPC: F02B33/00
Filed: 1967-02-17
Abstract: 1,170,109. Supercharging engines. BERTIN ET COMPAGNIE. Feb.17, 1967 [Feb. 18, 1966; Oct.21, 1966], No.7718/67. Heading FIB. In an I.C. engine supercharging system, in which an exhaust gas conduit connects downstream with two passages into either of which the exhaust gases can pass, one passage is disposed with its upstream end directly facing the downstream end of the conduit and leading to a chamber to which atmospheric air is admitted and which is connected to the engine inlet while the second passage conducts the exhaust gas to atmosphere. A cylinder exhaust passage 1, Fig.1 supplies exhaust gas to a fluid switch having passage 3 connected to silencer 5 and passage 4 connected to intake manifold 6. Normally open spring- loaded valves 11 admit ambient air to passage 4 which discharges, via spring-loaded normally closed valves 19, into intake manifold 6. Operation: On starting passage 4 is filled with fresh air and combustion gases leaving passage 2 enter passage 4 to compress the air. Pressure rises to close valves 11 and open valves 19 and the air charge passes to the carburetter through passage 8. Pressure acting through passage 7 switches the exhaust gas flow into passage 3. The flow in passage 3 produces a negative pressure in passage 4 thereby opening valves 11 to draw in ambient air. Valves 26 which open at a lower pressure than valves 19 admit air during partial intake e.g. with the carburetter butterfly valve almost closed or at starting. Valves 11, 19, 26 may be replaced by disc valves. A valve 47, is operated to give normal operation by isolating passage 4. In another embodiment the valves are replaced by aerodynamic valves 37, 38, Fig. 5 which have a much higher pressure loss factor when flow is in one direction than in the opposite direction. In valve 37 a vortex chamber 39 is connected to atmosphere via orifice 40 and to passage 4 via passage 41. In valve 38 an orifice 42 connects with a chamber 43 leading via substantially tangential passages 45 into intake manifold 6. The flow through passages 45 produces a vortex in cavity 43 which prevents return of the gas to orifice 42. A spring-loaded piston 48, prevents mixing of the exhaust gas with the air. In modifications the piston may be combined with or replaced by a diaphragm (51, Figs. 3 and 4 not shown) and the exhaust passage may have a converging section (32, Fig. 8 not shown). In a further embodiment the exhaust gases initially take a preferred path in conduit 105, Fig. 9 to move a spring-loaded piston 119. The movement of piston 119 causes an air inlet valve 115 to close and a valve 118 to open passing the air compressed in the cylinder 106 to the carburetter. As the energy of the exhaust gases is expended piston 119 is returned by the spring 120 and expels the residue of the exhaust gases through orifices 122. Meanwhile valve 118 closes and valve 115 opens to admit air to cylinder 106. In a modification of this embodiment conduit 105 is replaced by two aligned nozzles (125, 126, Fig. 10, not shown) forming two parts of a single truncated cone which are spaced apart to define an annular exhaust passage.