TWO-PHASE MIXING IN A TRACTOR DIESEL: THE CONCEPT OF TECHNICAL SOLUTION

Abstract

The article is devoted to the problem of improving the effective and environmental indicators of automotive equipment by two-phase mixing in diesels equipped with a power system with direct fuel injection into the combustion chamber. In this method of mixing, the first phase is carried out by injecting a certain dose (10-20 %) of a liquid activator (gasoline, kerosene, diesel fuel, etc.) in the suction stroke into the diesel intake tract to form an activator-air mixture in the diesel cylinder. In the second phase of mixing, the injection of the main fuel dose into the diesel cylinder is carried out by standard fuel equipment at the end of the compression stroke into a compressed activator-air mixture with the formation of a working mixture prepared for active ignition throughout the entire volume of the combustion chamber. For the practical implementation of the first phase of two-phase mixing, the diesel engine must be additionally equipped with a multi-point activator injection system with electromagnetic nozzles controlled by an electronic unit. This system should ensure high accuracy of activator dosing, its timely delivery in the suction stroke and equable distribution across the diesel cylinders. The performed research and development works included the development of a functional model of the system, as well as methods to justify the duration and algorithm of control pulses applied to electromagnetic nozzles. The system contains an activator tank, filter, electric pump, improved intake pipeline, electromagnetic nozzles, sensors and an electronic control unit based on a programmable microcontroller.

Keywords

• tractor
• diesel
• two-phase mixing
• liquid activator
• injection system
• electromagnetic nozzles
• electronic unit
• sensors