Abstract
For compliance with stringent exhaust emissions regulation, diesel engines have been equipped with electronically controlled components. Hence, there are many engine operating parameters to be controlled and the determination of these parameters is very complicated. To optimize these parameters, the concept of the vehicle-based optimization of engine operating control parameters was provided. In this paper, engine response functions of performance and emission were constructed by varying engine operating control parameters. Polynomial regression method was applied to get the engine response functions. Using these response functions of fuel economy and harmful emissions, functions were applied to vehicle simulation and vehicle performance and economy were evaluated under specific vehicle driving modes. In vehicle driving modes engine operating points of the vehicle were analyzed and fuel consumption and emission performance were calculated. Engine operating parameters are injection pressure, injection timing, EGR (Exhaust Gas Recirculation) rate and engine responses are fuel consumption and NOx emission. And engine operating parameters of each operating points were optimized using a simple algorithm.
Keywords:Diesel Engine, Optimization, Response Function, Polynomial Regression, Vehicle Simulation