The Development And Experiment Of High Compression Ratio Methanol Engine ECU

Higher performance of the electronic control system is required as theincreasingly stringent emission regulation. At the same time, with the environmentalissues becoming increasingly serious, the methanol as an alternative fuel has becomea recently research hotspot. In view of this, in order to meet the electrical controlrequirements of the high compression ratio spark-ignition methanol engine, theelectronic control unit is developed. The main work includes the design of the highcompression ratio methanol engine hardware, the ECU hardware-in-the-loop test andthe bench test of the methanol engine.The design of ECU was based on the microprocessor LPC1766. Input signalconditioning circuits, the actuators drive circuits, the system communication circuitsand power circuits were designed. A filtering of the high-frequency signal is achieved.It can be used to drive the actuators precisely and communicate to the host computer.A single cylinder ignition engine model was established by AMESim andSimulink. The hardware-in-the-loop simulation test platform was established by xPCreal-time workshop and the ECU was tested. The test result showed that the ECU hada good prediction of all sorts of possible interference and inhibition, and that thedesigned hardware-in-the-loop test platform was feasible.The bench test of the high compression ratio spark-ignition methanol engine hasbeen done, the affection of the EGR rate, ignition timing and mixture concentration tothe engine fuel consumption and the load characteristic were researched. Theexperiment results show that, in high speed condition, the methanol engine fuelconsumption is less than2.16times diesel fuel consumption, the thermal efficiency ofthe methanol engine is higher. In the medium and low speed, large load condition, themethanol engine fuel consumption is more than2.16times diesel fuel consumption,the thermal efficiency is lower. In the medium and low speed, large load condition,the methanol engine fuel consumption nearly2.16times diesel fuel consumption, thethermal is the same as diesel’s.The results of the bench experiments proved that the developed ECU can be usedto control the high compression ratio spark-ignition methanol engine. It lays the foundation for next work: knock suppression of the high compression ratio methanolengine.