Model-Based Air-Fuel Ratio Control of an LPG Engine with a Switch-Type EGO Sensor

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Project title

Code/計畫編號

NSC88-2212-E019-003

Translated Name/計畫中文名

具切換式含氧感測器LPG引擎之空燃比控制

Project Coordinator/計畫主持人

Jyh-Jong Sheen

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Mechanical and Mechatronic Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=431287

Year

1999

Start date/計畫起

01-08-1998

Expected Completion/計畫迄

01-07-1999

Bugetid/研究經費

281千元

ResearchField/研究領域

機械工程

汽車燃料控制系統必須提供精確的空燃比控制,以降低有害廢氣的排放量。切換式含氧感測器(EGO)所量測的空燃比訊號僅能提供過濃或過稀的資訊,使回授系統產生極限循環(Limit cycle)的振盪現象。本研究應用脈波寬度調變(Pulse-width modulation,PWM)技術於穩態之空燃比控制,以降低極限循環的振幅。至於暫態之空燃比控制,則以前饋控制方式,調整前饋控制器的參數以減少暫態之空燃比誤差。實驗結果顯示,所設計之空燃比控制器控制可有效抑制空燃比的暫態誤差,降低穩態誤差與極限循環的振幅。 The automobile fuel control system has to provide precise air-fuel ratio (AFR) to lower the engine emissions. The objective of this study is to apply PWM technique to AFR control of an LPG engine with a switch-type EGO sensor. Experimental results indicate that PWM control can reduce the amplitude of limit cycles associated with the switch-type sensor. Tuning the parameters of the feed-forward controller results in good transient AFR response.

Keyword(s)

液化石油氣引擎
空燃比控制
切換式含氧感測器
適應控制
LPG engine
Air fuel ratio control
Switch type exhaust oxygen sensor
Adaptive control

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Model-Based Air-Fuel Ratio Control of an LPG Engine with a Switch-Type EGO Sensor

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