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Apparatus and method for reducing emissions in a dual combustion mode diesel engine

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TLDR
In this paper, a diesel engine is adapted to operate in a conventional diesel combustion mode within a first speed and load range, and in a homogeneous charge compression ignition mode in a second load and speed range.
Abstract
A diesel engine is adapted to operate in a conventional diesel combustion mode within a first speed and load range, and in a homogeneous charge compression ignition mode in a second load and speed range. When operating in the homogeneous charge compression ignition mode, the emissions are dramatically reduced, resulting in a significant net reduction in emissions over the total load and speed operating range of the engine.

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Premixed charge compression ignition engine with optimal combustion control

TL;DR: In this paper, a premixed charge compression ignition engine, and a control system, is provided which effectively initiates combustion by compression ignition and maintains stable combustion while achieving extremely low nitrous oxide emissions, good overall efficiency and acceptable combustion noise and cylinder pressures.
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References
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Hybrid step combustion system

TL;DR: Hybrid step combustion system (HYSCOM) is available for four-stroke and two-stroke internal combustion engines as mentioned in this paper, which uses diesel and gasoline as fuels in operation.
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TL;DR: In this paper, the condition of an engine to be early warmed so as to obtain good performance of purifying its exhaust, by performing lean state stratified combustion in a range when the engine is low loaded while uniform combustion in range when it is high loaded while decreasing an intake air amount to generate rich air-fuel ratio.