Experimental Investigation For The Control Of CA498 Diesel Engine By EGR System

This paper described the status in quo about diesel engine in China, compared with the rules of law and development aim in China and other countries, provided an experiment project of EGR electricity control on the diesel engine.The author analyzed the principle of reducing NO_X waste gas by EGR, selected a fit valve system, at the same time, analyzed the VNT system.For the electricity control system, the paper described the method and strategy of control software, from the data of rotate speed and accelerograph corner, got the working condition of different kind of diesel engine, then compared the data from the experiment, to control the volume of waste gas, realized the optimization of control.The author have made a hardware control circuit, the control IC is 80C196KC. Signal accumulation by photo-coupler Isolation, rotation speed and corner measured by hall sensor, Output by ratio electromagnetic EGR valve, so the waste gas can be controlled by adjusting the volume of the recycle gas.the experiment proved that it is evident by adopting EGR, NO_X let reduced from 38.6% to 47%, for the better result, considering the factor of the engine power and economy of production, other methods, for example: VNT, water cooling EGR, adjusting EGR rate etc, can be adopted. In summary, EGR technique will have more widely application.