Design Of Electronic Control System Of Motorcycle Engine And Study On Fuel-film Compensator

With more and more strict exhaust emission standard in recent years, the motorcycle which can not be up to the emission standard will not be launched. Electronic controlled fuel injection(EFI) technology is the best choice for the current motorcycle environment protection technology because of its excellent fuel economy and low emission. So, motorcycle EFI system has a huge market in the future.According to the importance of environmental protection, saving energy and using in our country, an electronic controlled gasoline injection system developed by author for motorcycle engine LF125 is presented in this thesis. LF125 engine is optimized and matched by the system. It is composed of air system, fuel system and control system. Taking a series of controlled parameters as the inputs through some sensor, such as CPS(Crankshaft Position Sensor), MAT(Manifold Air Temperature sensor), CTS(Coolant Temperature Sensor), TPS(Throttle Position Sensor)and OS(Oxygen Sensor), the system controls the air-fuel ratio and ignition advance angle according to the controlled parameter maps stored in the memory of ECU. During the control process, the system adopts the proper control strategy in accordance with the operating mode as start, idle,acceleration, deceleration, and cruising mode in which the engine is working, and therefore the different needs for air-fuel ratio and ignition advance in various operating modes can be met. Owing to the distributorless ignition system are applied in this system, it has simple structure, credible performance and cheap cost.In this thesis, control unit ECU of electronic controlled system is designed taking 80C196KC singlechip as processor. Hardware design includes input signal processing circuit, input&output interface circuit, modulus transition circuit between microcomputer and data acquisition. Software design includes control program, original data and data structure design. In addition to, display program, outside data transition and communication program of controller accepting outside control are given.