Results of the research on the adaptive control of the injection timing in the diesel engine

The basic aim in controlling the diesel engine is to obtain a maximal effective torque for a given fuel dose with keeping at minimum toxic exhaust compounds. This postulate can be realized by matching the appropriate fuel injection timing. In this paper the research results of the control system are presented, which allow for the constant matching of the injection advance in the CI engine to the varying characteristics of the controlled object, that is the engine. Quality factor of the working process which is defined as an effective engine torque, is estimated on the base of the instantaneous crankshaft torsion measurement. This concept, unlike the currently used systems, suggest the use of efficient torque (Me) measurement to generate control quantities, which control the work process of an engine. Realization of such measurements leads to the treatment of the control system as an extreme control unit (maximizing quantitative parameters) as well as an adaptive control system (possibility of unit's reaction on high changes of the parameters influencing the work process of an engine). Combining the idea of the crankshaft torsion measurement with the idea of extreme control, a system can be designed, which makes use of torsion measurement for the adaptive control of the injection timing. The object of the research was a Diesel engine ISUZU Y17DT with electronically controlled injection pump and engine diagnostic system. Realization of the research aim required design and construction of the measurement system of the crankshaft torsion.