The Application And Research Of That Diesel Engine Is Refitted Into Single-Fuel CNG Engine

CNG engines are taken seriously for its cleaner emission. But it is usually complicated and less reliable because most of the CNG engines use bi-fuel. The research wants to tackle the problem. Refitted a diesel engine for a CNG (compressed natural gas) single-fuel engine. The purpose of the research wants to develop a tragedy to refit CNG engines, which will be, lower cost and more reliable. Designed a mechanical ignition timing system that is consisted of gear and belt for the CNG engine. Refitted a NANCHONG 4102 diesel engine for a CNG (compressed natural gas) single-fuel engine. For better performance on emission, there is an electronic device to loop control A/F ratio. A study is on relation to compressed ratio and power character. Though platform test and calculation they compared and analyzed the refitted engine performance. The research uses gear and belt ignition timing system. The system is simple, reliable and cheap. It is suitable to use in application. And probed a new way of the application of CNG engines. The paper advised that electronic control system could apply step by step. The writer believes that it is disadvantage to use high quality control system, because it is too expensive to use the electronic control system. The research puts forth a new electronic control system. The system is simple, easy to use and benefit to improve the emission effect of the refitted engine. The research is study the compressed ratio. And the paper will tell you the optimized value of the compressed ratio. The CNG engine also performances well on emission. It is priority to original one in all aspects. It emits less CH, CO ,CO2 ,NOx .than original one. It can reach GB standard of vehicle emission. The paper can use to be as a conference of research on refitted CNG engines or developed new CNG engines.