Dual air feed to four-stroke petrol engine - has pump and rotary slide valve distributing fuel air mixture equally to multicylinder engine

摘要

The four-stroke petrol engine for automotive applications has a suction duct via which ambient air is sucked into the cylinders. A pump furnishes a second air current, and with this works a suction carburettor dependent upon the engine's state of operation. A rotary slide valve (30) distributes the fuel and air mixture equally to the individual cylinders. The pump (12) is of the piston type whose speed is n/2 times that of the engine crankshaft, whereb n = the number of cylinders (2-5) of the engine. The rotary slide (30) runs at half the speed of the crankshaft. The fuel feed carburettor (20) can be of the suction type in front of the pump, or of the pressure type behind the pump (12).