The Electronic Control Fuel - Compressed Natural Gas (cng), Dual-fuel Engine Power To Restore The Study

With describing the energy sources and status of using of the Compressed Natural Gas Vehicles (CNGV) of our country, this dissertation is to testify that developing CNGV not only has great significance, but also has a bright future in our country.There is a problem that when the electronic control gasoline injected engine is rebuild into gasoline-CNG engine, the engine's power performance will be reduced. Facing this problem, the dissertation analyzes the CNG characters, the CNG supplying system and the fuel supplying ways, then puts forward two improving schemes: one is to use the TPS signal as a control signal, decrease the CNG supply and add some gasoline for co-combustion when the engine is in high loads to come back the engine's power(Scheme 1), another is to use the TPS signal as a control signal, shut off the CNG supply and supply gasoline for combustion when the engine is in high loads to come back the engine's power(Scheme 2). Furthermore, the dissertation develops two controlling devices according to the two schemes respectively.The two controlling devices have been used to complete the studies of engine's power performance, fuel consumption and exhaust emissions. The dissertation compares and analyzes the two devices' test results, and selects the superior scheme to ensure the comeback of engine power as well as the fuel consumption and exhaust emissions. At last, it sets the fuel transforming point by testing.