| Summary: | 碩士 === 大葉大學 === 車輛工程學系碩士班 === 95 === This research is proposed to study the hydrogen fuel cell motorcycle power variation control method by controlling the pressure solenoid valve to regulate hydrogen flow rate so that fuel cell output power demand can be achieved. The fuel cell laboratory test bench usually controls the hydrogen flow rate by flow control solenoid valves with fixed pressure difference, while observe the fuel cell voltage drop under different load current conditions. In real driving conditions, fuel cell motorcycle power demand varied depends on different road conditions. In order to maintain the fuel cell working voltage, the hydrogen pressure and hydrogen flow must change accordingly to supply the fuel cell required power.
This research established the fuel cell powertrain dynamic simulation program for each component module and under Hardware in the Loop, (HIL) environment to simulate the driving power demand and the corresponding hydrogen flow rate requirements. Microcontroller MC68376 from Motorola was used to control the hydrogen flow rate by Pulse Width Modulation, (PWM) signal to change signal frequency and duty cycle to control the pressure solenoid valve On-Off, under fixed supply pressure.
Solenoid Pressure valve dynamic model were established by system identification method from the experiment data which uses input voltage of solenoid valve and flow sensor measured flow rate data. The flow controller was designed to meet the needed hydrogen demand corresponding to the power variation. Because the flow control solenoid valve is more expansive than the pressure control valve, this study proved that with proper design controller incorporated with pressure valve to control the hydrogen flow rate can reduce the fuel cell motorcycle system cost. Fuel cell motorcycle powertrain simulation under HIL environment can provide information for controller parameter effects evaluation which can reduce the trial-and-error and research and development time.
|
|---|
