Analysis and experimental research on the influence of VVT point selection on exhaust temperature in low speed operating conditions

During the development of a model equipped with dual VVT engines, higher temperature catalyst was discovered. Therefore, sweep point is optimized under low speed and high load conditions. The test results show that has significant effect on catalytic converter, converter decreased after optimization. At same time, opening little dynamics. In addition, an knocking tendency engine. When increases, power performance engine are deteriorated. On contrary, if ignition angle can be advanced, optimized.