Study of a device for implementing diesel engine fuel supply skipping

Abstract

The article discusses the problem of increasing the fuel efficiency of diesel engines at low load and idle modes by turning off the cylinders. The method is one of the effective ways to increase fuel economy in these modes. But its inherent disadvantages do not allow to fully obtain fuel economy. The method of skipping fuel supply is presented, which consists in the fact that when the diesel engine switches to low load and idle modes, the fuel supply stops not in the same cylinder, but in all cylinders alternately. To implement this method of regulation, the diesel fuel system must allow the skipping of individual cycle feeds. This is only possible with electronic fuel control. Many currently operating diesel engines are equipped with electronically controlled fuel supply systems, however, due to design features, it is not always advisable to reconfigure the system to work with a fuel supply skipping. In this regard, the most interesting are electronically controlled devices (valves), which can be implemented in a standard fuel supply system. The practical interest have the ring-type valves, where the split ring itself performs the function of the power and locking element, and the cylindrical surface serves as a socket for the ring. A fuel flow skipping device based on an electromagnetic-controlled valve of the annular type is proposed. Theoretical studies have made it possible to optimize the shape and size of the valve, in particular, to improve performance with a small section of the ring, to reduce the opposing forces and to obtain a large power of the electromagnet. Bench tests showed the efficiency of the proposed device with different numbers of skipped fuel supplies.