A STUDY ON IMPACTS OF CNG SUPPLYING METHOD ON THE INTAKE MANIFOLD TO OPERATION OF TRANSFERRING GASOLINE ENGINE

When supplying CNG to the engine in the intake manifold, two methods can be used: the mixer and the injection system. Each method has its own strengths and weaknesses. Hence, to evaluate the effectiveness of each method, there highly neccessary should be a veryfication via testing. In this study, the authors dug deeper in calculating the design of the mixer and the CNG injection system then proceeded to experimentally evaluate the results. The results showed the effects of CNG-granting methods on power, fuel consumption and emission rate of CO, HC, NOx components of from the engine. In particular, when using CNG, the power engine reduced to 20.8% for the use of blenders, a decrease of 15.9% for the use of injection systems; Fuel consumption was reduced by 2.4% and 5.4%, respectively, when using these two gas supply systems. CO and HC emissions decreased by 85%, while NOx decreased by 58% for both methods of supply.