Two-phase mixture formation in transport diesel engine: the control algorithm and the devise for its implementation

The article reviews the issues dedicated to improving of energy and environmental indicators of automotive machinery by means of two-phase mixture formation in diesel engine. With this method, the 1st phase of mixture formation proceeds at intake stroke by the supply of the certain dose of fuel activator (gasoline, alcohol, biodiesel, etc.) into engine intake manifold, where a mixture of air and activator is formed. The 2nd phase proceeds at compression stroke by the supply of the major dose of diesel oil with the standard fuel supply system into combustion chamber. For the practical implementation of the described method, the diesel engine needs to be equipped with an automatic system for fumigation of air charge. The system contains electronic control unit (ECU), electromagnetic injectors, electric pump and sensors of engine speed and load mode. An algorithm of ECU operation for program control of injectors, supplying activator at the intake stroke, was developed. The sequence of actuation of injectors, coincident with the engine firing order, was substantiated. A formula for calculation of the duration of control pulse supplied to the injectors was derived. The proposed automatic system performs the activator injection, corresponding to the engine firing order, and the exact activator dosage, depending on engine speed and load mode, at the 1st phase of two-phase mixture formation.