Control of Oscillatory Process of the Common Rail System in the High-Pressure Line

One of the main advantages of an electronically controlled common rail system is the ability to repeatedly inject of fuel into an engine cylinder in one cycle. An increase in the fuel pressure level in them up to 250 MPa enhances the wave phenomena that occur in a pipe of common rail system. The result of the described processes is a decrease in the accuracy of control of the injection characteristic and cyclic supply. A device is proposed that includes a hydraulic valve with an electric drive (electromagnetic or piezoelectric) to compensate the wave phenomena and control them in the common rail system. The valve is installed in the fuel accumulator of common rail system and separates its volume from the low-pressure line. The actuation of the valve creates a pressure pulse in the pipeline. The characteristics of the impulse depend on the flow area of the jet, the frequency of operation, the design of the valve and its electric drive. The design of the obturator part of the valve determines the amount of unloading of the high-pressure line. The movement is managed by controlling the electrical signal sent to the electro-hydraulic valve, and thereby, the characteristics of the pressure pulsations created with it. This character of pulsations is selected for damping (weakening) ones in the high-pressure line of the common rail system caused by the operation of its injectors. It is made to improve the uniformity of fuel supply across the cylinders, as well as to give them the required parameters to control the shape of the injection characteristic.