Premixed combustion strategies have the potential to achieve high thermal efficiency and to lower the engine-out emissions such as NOx. However, the combustion is initiated at several kernels which create high pressure gradients inside the cylinder. Similarly to knock in spark ignition engines, these gradients might be responsible of important pressure oscillations with a harmful potential for the engine. This work aims to analyze the in-cylinder pressure oscillations in a dual-fuel combustion engine and to determine the feedback variables, control actuators, and control approach for a safe engine operation. Three combustion modes were examined: fully, highly, and partially premixed, and three indexes were analyzed to characterize the safe operation of the engine: the maximum pressure rise rate, the ringing intensity, and the maximum amplitude of pressure oscillations (MAPO). Results show that operation constraints exclusively based on indicators such as the pressure rise rate are not sufficient for a proper limitation of the in-cylinder pressure oscillations. This paper explores the use of a knock-like controller for maintaining the resonance index magnitude under a predefined limit where the gasoline fraction and the main injection timing were selected as control variables. The proposed strategy shows the ability to maintain the percentage of cycles exceeding the specified limit at a desired threshold at each combustion mode in all the cylinders.

预混合燃烧策略具有实现高热效率并降低发动机排放物（例如NOx）的潜力。但是，燃烧是在几个内核处开始的，这些内核在气缸内产生高压梯度。与敲击火花点火发动机类似，这些梯度可能会导致重要的压力振荡，并对发动机产生潜在的危害。这项工作旨在分析双燃料内燃机的缸内压力波动，并确定反馈变量，控制执行器和控制方法，以确保发动机安全运行。检查了三种燃烧模式：完全，高度和部分预混合，并分析了三个指标来表征发动机的安全运行：最大压力上升率，振铃强度，以及压力振荡的最大振幅（MAPO）。结果表明，仅基于压力上升率等指标的操作约束条件不足以适当限制缸内压力波动。本文探讨了使用爆震状控制器将共振指数的幅度保持在预先定义的极限下，在该极限下选择汽油分数和主喷射正时作为控制变量。所提出的策略显示了在所有气缸中的每种燃烧模式下将超过指定极限的循环百分比保持在期望阈值的能力。本文探讨了使用爆震状控制器将共振指数的幅度保持在预先定义的极限下，在该极限下选择汽油分数和主喷射正时作为控制变量。所提出的策略显示了在所有气缸中的每种燃烧模式下将超过指定极限的循环百分比保持在期望阈值的能力。本文探讨了使用爆震状控制器将共振指数的幅度保持在预先定义的极限下，在该极限下选择汽油分数和主喷射正时作为控制变量。所提出的策略显示了在所有气缸中的每种燃烧模式下将超过指定极限的循环百分比保持在期望阈值的能力。