Optimization of Excess Oxygen and Spark Timing to Improve the XU7 Engine Performance

To investigate the effect of oxygen enrichment in internal combustion engines, we used GT-POWER code to simulate the XU7 engine. The result show an increase of %8 in power and torque, and a decrease of %7 in brake fuel consumption for %23 volumetric excess oxygen. However, the increase of NOX is the only undesired side effect. To reduce exhaust NOX a convenient time variable is selected which can modify this effect, while prevents too much reduction in excess power and torque. Spark timing is chosen as tha mentioned time variable. To optimize oxygen amount and spark timing, we link GT-POWER and SIMULINK-MATLAB as well as neural network toolbox of MATLAB. The target of optimization is %50 reduction in NOX with respect to %23 volumetric oxygen enrichment case and %5 increment in power with respect to natural aspiration case. The designed algorithm is capable of optimizing excess oxygen and spark timing