Development Of Electronic Control System For Gaseous Fuel Engine

In recent years, the shortage of petroleum resources and the increasingly strict emissionsregulations become two main problems of the development of automobile industry. Lookingfor clean fuel, reducing dependence on fossil fuels and reducing pollutant emissions, are hotresearch topics in the automotive industry. The fuel gas, such as the CNG, LPG and soon, with its abundance, cheap price, fewer pollutants after burning and other advantages, hasbecome a focus of research for automobile.Based on the analysis of Gaseous Fuel engine control system, combined with thedevelopment state at home and abroad, this paper developed an engine control system,including electronic control unit (ECU) and the calibration software. In the design ofECU, TI’s TMS320F28035DSP is selected as the control core, and power circuit, signalacquisition circuit, communication interface circuit, solenoid valve drive circuit and thehigh-energy ignition circuit etc. are designed as well. The designed solenoid valve drivecircuit with fast execution and high control precision can meet the requirements of differentjet nozzles. High-energy ignition circuit can ensure the engine ignition reliability in harshenvironment. The use of UEGO can make the engine lean combustion, further reducing thecontent of pollutants in the exhaust gas. As for the calibration software, XCP protocol basedon CAN bus is used. The CAN driver module, XCP protocol module and FLASH memorymodule are designed. The developed software is characterized with clear structure, goodmodularization, and is easy to transplant to other controllers.Simulation test is conducted to validate the ECU and calibration software. Thenwide-range oxygen sensor is calibrated. In the following, the jet pulse width and ignitionadvance angle on the modified Yuchai6105natural gas engine are calibrated, andthe characteristic curve of engine is draw. The results show that this engine reaches powerrequirements. The development of electronic control system basically achieves the goal.