本篇文章利用參考模型適應性之技術設計控制器來控制單氣缸均質進氣壓燃(Homogeneous Chagre Compression Ignition, HCCI) 引擎的燃燒時間點。
控制的目標為在固定的引擎轉速下，當引擎內部的參數，如引擎排氣端的熱傳係數或油氣混合物性質，
隨時間緩慢改變時進行燃油切換，仍能維持住50%燃油燃燒時間點在所設定的時間點。
燃燒時間點的控制乃藉由進氣時開啟排氣閥門的再回吸揚程
(Rebreathing Lift) 來操控進氣行程結束時汽缸內混合氣體的溫度。
為了便於適應性控制器的設計，在設計時一個單缸HCCI引擎之高階模型將被簡化成只包含前後循環中燃燒時間點動態的離散雙線性係數模型。
另外，要將所設計的適應性控制器實現需要燃油注入量的前授訊號及燃燒時間角回授訊號。
本文將利用穩定性的分析及在高階模型建構的閉迴路模擬下，展示所設計的適應性控制器在汽缸排氣端熱傳係數隨時間緩慢改變時，
能藉著穩定雙線性動態系統來控制燃燒時間點在所設定的值。

This thesis presents a model reference adaptive controller to
regulate ignition timing of a homogeneous charge compression
ignition (HCCI) engine with high dilution in the presence of
uncertainty or unknown variation in plant parameters such as heat
transfer coefficient and cylinder charge properties.The control of the combustion timing is based
on manipulating the charge temperature through internal dilution,
which is achieved by controlling the lift of a secondary opening of
the exhaust valve, also known as the rebreathing lift. The model
reference adaptive controller is designed based on a simplified
bilinear parametric model which contains only the cycle-to-cycle
ignition timing dynamics. Implementation of the designed adaptive
controller requires feedforward information of the injected fuel and
feedback information of the combustion timings. It is shown through
stability analysis and closed-loop simulation of a full-order
engine model that the adaptive controller is able to regulate the
combustion timing to desired set-point by stabilizing the
bilinear dynamics when heat transfer coefficient are slowly changing
with time.

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