초록 ▼

A fuel-injection system for an internal combustion engine and in particular, for a diesel motor has at least one injection element for each combustion cylinder controlled from a control device, which injection element has an injection opening extending into the cylinder and closable by same, and a p

A fuel-injection system for an internal combustion engine and in particular, for a diesel motor has at least one injection element for each combustion cylinder controlled from a control device, which injection element has an injection opening extending into the cylinder and closable by same, and a pressure chamber arranged in front of said injection opening, which pressure chamber is connected to a high-pressure part supplied by a fuel pump in dependency on the motor speed, load and load change. The injection amount of the fuel into the combustion cylinder can be supplied by means of a metering device preferably connected in front of the fuel pump and operable by the control device. The metering device has a 2/2-way valve connected in front of the fuel pump designed as a radial piston pump, which 2/2-way valve opens or rather closes during suction in order to achieve the desired fuel injection amount in dependency on the position of the pump piston of the fuel pump. With this arrangement it is in particular prevented together with the monitoring of the pressure in the high-pressure part on the one hand that one or several combustion cylinders do not operate over a longer period of time in an insufficient operating condition and on the other hand that greater motor damages through defects in particular in the injection elements also can be avoided. With this the fuel consumption and also the noise and polluting emissions can be kept to an absolute minimum.

대표청구항 ▼

In a fuel-injection system for an internal combustion engine, which includes at least one combustion cylinder, comprising a control device, a fuel pump, a high-pressure part supplied with fuel by said fuel pump in dependency on the motor speed, load and load change of said engine, and at least one i

In a fuel-injection system for an internal combustion engine, which includes at least one combustion cylinder, comprising a control device, a fuel pump, a high-pressure part supplied with fuel by said fuel pump in dependency on the motor speed, load and load change of said engine, and at least one injection element for each said combustion cylinder controlled from said control device for injecting an injection amount of said fuel into said combustion cylinder, said injection element having an injection opening in communication with said combustion cylinder, means for opening and closing said injection opening and a pressure chamber arranged upstream of said injection opening in communication therewith, said pressure chamber being in communication with said high-pressure part so as to receive said fuel from said fuel pump, comprising the improvement wherein said injection amount of said fuel being injected into said combustion cylinder is determined by means of a metering device, said metering device being constructed as a flow controller connected upstream of said fuel pump and having a first throttle valve operable by said control device, a pressure-correcting second throttle valve being arranged in series in combination with said first throttle valve, said pressure-correcting second throttle valve being adapted to balancingly change the pressure drop above said first throttle valve so that there always exists the desired required pressure over said flow regulator.