Parametric Study of a Four-Stroke Motorcycle Engine with Fuel Injection System

• Main Authors: Hsiang-Ming Hsiung, 熊湘明
• Other Authors: Yuh-Yih Wu
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/37428268291221194190

碩士 === 國立臺北科技大學 === 車輛工程系碩士班 === 92 === This research is a parametric study for a commercialized four-stroke 125c.c. electronic fuel injection (EFI) motorcycle engine. The electronic control unit (ECU) with 8-bit of original engine is replaced by a Motorola MC68376 32-bit microprocessor, The main purpose is to study effects of injection timing and spark advance on engine combustion characteristics and performance at various engine speed and throttle position. Then, relationship between the control variables, injection timing and spark advance, and engine performance will be set up. The conclusions from exponential results are as follows: 1. It will be easier and more flexible to adopt the embedded control system for the varies of engine control parameters. And it can reduce the time and cost for engine control system design. 2. Fuel injection timing should be varied according to the condition of engine speed and throttle position. The excess advance or delay of spark timing will affect severely to engine performance, fuel consumption, and exhaust emissions. Furthermore it will even cause engine misfire. 3. The horsepower and torque of an engine with spark timing varies with engine speed only are lower than that of an engine with spark timing varies with speed and load. The previous one also causes higher specific fuel consumption. Therefore, spark timing has to be properly controlled according to engine speed and load. 4. In the same throttle position, the minimum-spark-advance for beset torque (MBT) will be a little advanced with the increase of engine speed. That will increase the engine performance and reduce fuel consumption and exhaust emission. The experimental results of this thesis will provide a good reference for the design of motorcycle fuel injection system control. Furthermore it can reach the purpose of energy-saving, low exhaust emissions, and high engine performance.