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AssigneeDr. Ing. h.c.F. Porsche Aktiengesellschaft
InventorHeinz Dorsch
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An arrangement to eliminate the disadvantage of explosions caused by intake line backfiring resulting under cold engine starting conditions of internal combustion engines equipped with fuel injection systems of the type that inject, under cold starting conditions, additional fuel in finely divided form into the manifold intake pipe. In an improved fuel injection system, a fuel distribution arrangement comprising a fuel admitting portion communicating with an injection nozzle, and fuel feed components each of which extends from the admitting portion to a corresponding one of a plurality of intake lines to the engine is provided in the manifold intake pipe. A supply of air bypassing a primary intake pipe choke is forced into the fuel admitting portion and because of the high flow rate in the admission tube, the air is mixed very thoroughly therein with the fuel injected so that a uniformly distributed air-fuel mixture is obtained and fuel deposited on the admission tube inner wall is moved immediately to the cylinders, such that flames backfiring from combustion chambers of the engine cannot initiate explosions.
A fuel injection system for a mixture compressing, external ignition, four stroke cycle internal combustion engine with fuel injection in an intake pipe, comprising a primary intake pipe in which an air metering element and an intentionally actuated choke are arranged in succession, a plurality of intake lines for supplying an air-fuel mixture to engine cylinders, all of the intake lines and the primary intake pipe opening into a common manifold intake pipe and an electromagnetically actuated injection nozzle for cold starting of the internal combustion engine, characterized in that a fuel distribution arrangement is provided within the manifold intake pipe and comprises a fuel admitting portion and fuel feed components each of which extends from said admitting portion to a corresponding one of said intake lines, wherein an air supply means bypassing said choke is provided for forcing air directly into the fuel admitting portion bypassing the choke, and wherein said injection nozzle supplies fuel into said fuel admitting portion, whereby the air from said air supply means and fuel from said injection nozzle are thoroughly mixed within said admitting portion and uniformly distributed by the fuel feed components to the respective intake lines to the engine cylinders.
Dependencies are inferred from the claim text.