Abstract: A fuel injection nozzle comprising a needle valve which is lifted away from a valve seat against the spring force of a pressure spring by receiving pressure from the fuel to be injected. The lift of the needle valve thus causes the fuel to be injected into a combustion chamber of an internal combustion engine. The lift of the needle valve takes place in two stages, in particular by reducing the amount of initial fuel injection, to reduce engine knock. This is accomplished by the provision of a movable, cylindrical plunger which abuts the needle valve at a certain lift thereof and restricts further lift of the needle valve by being subjected to the pressure from the fuel to be injected. Thus, the increase in the rate of fuel injection is restricted to an optimum level.

Abstract: A method of controlling a fuel supplying apparatus, particularly, an electronically controlled fuel injecting apparatus is provided, said apparatus having a feedback control function to regulate the air fuel ratio of air-fuel mixture to be supplied to an internal combustion engine on the basis of a fuel amount value representative of a fuel amount to be supplied to the engine, which value is calculated in response to an output signal of an oxygen concentration sensor provided in the exhaust system of the internal combustion engine. The fuel amount value is compared with a predetermined value. When the fuel amount is larger than the predetermined value, the feedback control for the air fuel ratio is stopped, thereby performing the open-loop control for the air fuel ratio, whereby, a simple arithmetic processing is obtained and the arithmetic time is shortened and the memory capacity can be saved.