Calibration Of Electronic Control Motorcycle Engine

In order to reduce motorcycle emission, and meet the Chinese emission standard at third stage, improve motorcycle fuel economy and dynamic performance, the paper studied the calibration of electronic control engine on FY125-3P motorcycle.Based on the characteristic of electronic control technology, considering the maturation and the cost of electronic control system parts synthetically, the paper designed a technology scheme of electronic control system, which has 6 sensors(engine speed sensor, inlet air temperature sensor, inlet air temperature sensor, engine temperature sensor, oxygen sensor, throttle valve position sensor ), closed loop control with three-way catalyst and self-adaptive function. This system has a characteristic of simple configuration, low cost, convenient for installation, high precision and reliability.By retrofitting engine flywheel signal wheel, using the pulse signal of signal wheel, and analyzing the engine instantaneous speed pulse with software, the judgment for stroke of the engine was realized, which replaced the conventional phase sensor.Three catalytic converter samples from different factories were compared by tests. Then in order to select optimum converter, the conversion results of catalytic converter and the effect to engine power were considered comprehensively.The throttle body for electronic control motorcycle engine was designed optimum in this paper. It was studied the influence of the inner diameter, configuration of valve and its axe and inside configuration of inner pipe of throttle body on the engine performance. The inner diameter of throttle body was designed on the basis of resonance theory. And the samples of throttle body designed were manufactured and tested by engine experiment. Results showed that the engine power was improved effectively when applying the option design throttle body with a thin valve and a taper inlet port, the size of inner diameter increased from 26mm to 28mm and the thickness of the valve decreased. And the optimization throttle body can meet the design target.According to performance requirements of engine and vehicle, such as power performance fuel economy,emission,etc, combining with the matching and calibration methods of working condition analysis, exhaust analysis and X analysis, engine test bench and vehicle tests were done to calibrate the electronic control system, optimize the running and control parameter. After completed a mass of calibration experiment, such as intake load sampling point calibration, response time of injector validation, exhaust back pressure calibration, intake load calibration, injection angle calibration, starting performance calibration, second load calibration, transition condition calibration, X closed-loop control calibration, altitude test calibration, winter and summer tests, it was gained a series of control parameters, curves and MAP for engine fuel injection,ignition advance angle,etc. That can made engine optimization synthetically on emission performance, dynamic performance and economy.In the end the performances of the engine and vehicle developed were validated by experiment.Comparing with the original carburetor motorcycle, the emissions of CO, HC and NOx for electronic control engine motorcycle were reduced largely, and lower than 70% of limit value of Chinese emission standard at III stage. And the fuel consumption was reduced by 5.8% at full load, drive power of rear wheel was little lower, accelerated performance, especially, the overtaken acceleration was improved obviously.