GB320656A - Improvements in bi-fuel supply systems of internal combustion engines - Google Patents

Abstract

320,656. Guibiansky, J. June 19, 1928. Addition to 273,085. Spray carburettors.-The parent Specification describes a device for controlling the supply of light or heavy fuel to a carburettor in accordance with the temperature of the combustion gases. The device comprises a spring-loaded piston such as 2, Fig. 1, subject to the expansive force of a liquid 5 in a container 6 located, for example, in the exhaust manifold 7. When such a device is applied to vehicles that are frequently stopping, it has not time to cool sufficiently to bring the parts into the position to supply the lighter fuel, and the invention consists in combining with such a device, a mechanicallyactuated valve that ensures, irrespective of the position of the thermal device, a supply of light fuel at starting and until a certain speed of engine or vehicle is reached. The cylinder 1 containing the piston 2 has inlets 9, 10 and outlets 11, 12 for heavy and light fuel respectively. The outlets lead to a second cylinder 13 containing a piston 16 similar to piston 2, but actuated through linkage 20, 19, 18 by a governor driven preferably from a moving part of the vehicle. Pipes 14, 15 convey the heavy and light fuels to the carburettor. A bye-pass 21 connects the inlet pipe 10 to the outlet 12 for the light fuel. The thermal device is shown in the position for admitting heavy fuel, the parts being heated, but such heavy fuel cannot pass to the carburettor through pipe 14 until the vehicle or engine speed is sufficient to cause the governor to raise the piston 16. The engine, therefore, is always supplied with light fuel for starting. In a modified construction, Fig. 2 (not shown), the cylinder 13 is arranged at right-angles to the cylinder 1. In a further modification, a threeway valve replaces the piston 16. A governor control of the three-way valve or piston for fuels contained in two float chambers supplied from the pipes 11, 12 is described in connection with Figs. 4 and 5 (not shown). In. Fig. 6, the heavy fuel, supplied through pipe H, enters the thermal control device T and then passes through a heating coil in the exhaust pipe O before entering the float chamber CH. The light fuel in pipe L passes to float chamber CL, the flow from the float chambers to the jet J being controlled by the three-way valve or piston actuated by the governor G driven from the propeller shaft N of the vehicle.