The Research and Development of Saving-Energy Control Technology of Fuel Cut System for Motorcycle
黃崧林、張舜長
E-mail: 9419917@mail.dyu.edu.tw
ABSTRACT
The main purpose of this study is to develop the saving-energy devices. The concept of this design is to apply the device of the by-pass air valve. When engine is running under middle or high speed and the throttle valve is closing state, then solenoid is energized and the vacuum of intake-manifold is leaked. The air movement can not produce a partial vacuum in the venturi,
therefore the by-pass air system cuts off the normal fuel circuit at this stage. When engine speed decreases closely idle speed, then the solenoid is de-energized. Because of the throttle position and engine speed are simultaneously received by the ECU. The ECU can process signals and estimate the fuel-cut timing. This thesis utilized the single chip AT89c52 as the main centre of controller, cooperates with peripheral hardware, compile with C-programming language and planning the strategies of the fuel-cut to build up fuel-cut control system. We also used the Lambda Meter to monitor the variation of engine’s air/fuel ratio, manifold absolute pressure, engine speed and throttle position to judge that the fuel-cut system acting. This study adopt self-built driving cycle to control the throttle opening by the electronic motor under some conditions, such as the same time, duty cycle and load, etc. And to measure the throttle valve opening under the different angles before and after the engine installed the fuel-cut system, and measured the fuel consumption difference of system, in order to prove that the fuel-cut system’s feasibility and practicability. The focus of this study is to improve the defects of carburetor engine and adopt the advantages of fuel cut control for computer control engine. The characteristics of this study were simple system structure and did not require many sensors and actuators, such as fuel pump,
injectors, O2 sensor, temperature sensor, pressure sensor and so on. The final goal of this study was to improve the fuel consumption while throttle valve is closed in a moment, because the vacuum of intake-manifold is raise with the result that waste of unnecessary fuel supplied. We also want to estimate the feasibility of fuel-cut system and make the environment much better.
Keywords : Fuel-Cut System, Carburetor
Table of Contents
第一章 緒論...1 1.1 研究背景...1 1.2 研究動機與目
的...2 1.3 文獻回顧...3 1.4 研究步驟...6 1.5 論文架 構...9 第二章 系統概述...10 2.1 系統元件特
性...10 2.1.1 化油器原理...10 2.1.2 節氣門位置感知器...11 2.1.3 歧管絕對壓力感知器...12 2.1.4 含氧感知器...13 2.1.5 旁通空氣控制
閥...14 2.1.6 電磁閥...15 2.2 燃油切斷系統控制策略規劃...19 2.2.1 建立控制策略...20 2.2.1.1 高速燃油切斷...22 2.2.1.2 減速燃油切
斷...22 2.2.1.3 回復供油時機...22 2.2.2 建立判斷式...23 2.3 控制器硬體 設計製作...24 2.3.1 電源供應...25 2.3.2 主控制器...27 2.3.3 輸入與輸出訊號...28 2.3.4 訊號處理...29 2.3.5 控制器硬體配
置...38 2.4 實驗相關設備...41 第三章 結果與討論...49 3.1 控制器模擬測試...49 3.2 控制器實車測試...53 3.3 控制器驗
證...56 3.3.1 實車量測...56 3.3.2 量測型態的訂定...64 3.3.3 節氣門開度控制...66 3.3.4 自訂量測型態測試...69 3.3.4.1 無燃油切斷系統量
測...71 3.3.4.2 加裝燃油切斷系統量測...76 3.3.5 測試結果與分析...82 第四章 結論與 建議...87 4.1 結論...87 4.2 建議事項與未來研究項
目...89 參考文獻...91 附錄(A) 電磁閥規格表...96 附 錄(B) AT89C52 ...98 附錄(C) IRF640N...99 附錄(D)
ADC0804...100 附錄(E) ADC0804 連續轉換模式...101 附錄(F) LM324 ...102 附錄(G) PC817 ...103 附錄(H) CB-68LP 端子座I/O 腳位 圖...104 附錄(I) 燃油切斷控制器之程式...105 附錄(J) 燃油切斷控制器電路 圖...110
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