The effects of unburned hydrocarbon recirculation on ignition and combustion during diesel engine cold starts

Cui, Yi; Peng, Haiyong; Deng, Kangyao; Shi, Lei

doi:10.1016/j.energy.2013.10.083

Cited by 10 publications

(6 citation statements)

References 27 publications

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“…Some researchers focus on very specific aspects, such as the first few engine cycles following a cold start. Broatch et al 13 studied the influence of fuel; Cui et al 14 analysed the effect of unburnt HC recirculation. Pastor et al 15,16 studied ignition and diesel combustion development under low-temperature cold start conditions, in particular the glow-plug influence.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of the influence of coolant and oil temperature on combustion and emissions in an automotive diesel engine

Tauzia

Maiboom

Karaky

et al. 2018

International Journal of Engine Research

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Since many trips are of short duration and include a cold start, automotive engines run quite often without having reached their nominal temperature. This is known to have some major drawbacks, such as increased fuel consumption and higher emissions due to lower efficiency of after-treatment devices, but detailed description of these various effects is seldom presented in the literature. In this article, experiments were conducted on an automotive diesel engine by varying independently the coolant and oil temperatures between 30°C and 90°C. Three different operating conditions (low, mid and full load) were studied. The experimental setup is briefly described as well as the uncertainty of the associated measurements and the development of analytic tools. Then, the evolution of volumetric efficiency, energy share, combustion heat release and exhaust emissions (NOx, particulate matter, CO, unburned hydrocarbons) are described in detail and analysed. Several strategies were considered, including some corrections used in the standard engine control unit to compensate for the low coolant temperature. Some effects of the coolant and oil temperature reduction were clear: increase in friction losses, volumetric efficiency and ignition delay and decrease in NOx emissions. On the contrary, the evolution of brake thermal efficiency, particulate matter, CO and unburned hydrocarbon emission depended on the operating point.

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Section: Introductionmentioning

confidence: 99%

Experimental analysis of the influence of coolant and oil temperature on combustion and emissions in an automotive diesel engine

Tauzia

Maiboom

Karaky

et al. 2018

International Journal of Engine Research

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“…They stated that the amounts of the exhaust gas toxic components during the cold engine start-up are much higher in comparison with those during the startup of the pre-heated engine [23]. The effects of unburned hydrocarbon recirculation on ignition and combustion during diesel engine cold starts were investigated by Cui et al [24]. An analysis of the chemical kinetics showed that the reaction intermediates present in unburned hydrocarbons, such as ketohydroperoxides, were the most significant factor in enhancing the LTR during non-firing cycles [24].…”

Section: Introductionmentioning

confidence: 99%

“…The effects of unburned hydrocarbon recirculation on ignition and combustion during diesel engine cold starts were investigated by Cui et al [24]. An analysis of the chemical kinetics showed that the reaction intermediates present in unburned hydrocarbons, such as ketohydroperoxides, were the most significant factor in enhancing the LTR during non-firing cycles [24]. At the same time, the substantial heat capacity of unburned hydrocarbons suppressed the LTR for higher recirculation rates [24].…”

Section: Introductionmentioning

confidence: 99%

“…An analysis of the chemical kinetics showed that the reaction intermediates present in unburned hydrocarbons, such as ketohydroperoxides, were the most significant factor in enhancing the LTR during non-firing cycles [24]. At the same time, the substantial heat capacity of unburned hydrocarbons suppressed the LTR for higher recirculation rates [24]. Desantes et al [14] studied the influence of nozzle geometry on ignition and combustion progression under glow-plug aided cold start conditions in an optically accessible engine.…”

Section: Introductionmentioning

confidence: 99%

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The Impact of Changing the Fuel Dose on Chosen Parameters of the Diesel Engine Start-Up Process

et al. 2019

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For internal combustion engines, many faults relating to the combustion process can occur, which affect the engine technical condition, its electrical equipment, the natural environment, etc. This article presents the results of the influence of the regulatory factor, which was the fuel dose (3 dose values), on selected parameters of the start-up process at constant settings of other control parameters (fuel injection advance angle and injection pressure). The tests of the start-up process were carried out on a fourstroke single-cylinder diesel engine. In this study, the results of the following electrical start-up parameters were analyzed: the maximum current consumed by the starter, difference of voltages on the battery before and after the start-up, voltage drop on the battery at the beginning of the start-up, average power of the starter, starter operation time, and the maximum pressure value in the first combustion cycle.

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“…Comparing with the diesel engine starting at extremely low temperature, the starting at the normal temperature (around 30 ∘ C) is more frequently used. Peng et al and Cui et al researched influence of EGR on ignition and combustion during diesel engine starting at the normal environmental temperature which is common in south China; they found that the optimal opening of recirculation valves can advance the first firing cycle and reduce the duration of heavy smoke emission; it could be explained by the existence of reaction intermediates, such as ketohydroperoxides that could enhance the low temperature reaction, generated in the nonfiring cycles [25,26].…”

Section: Introductionmentioning

confidence: 99%

Design and Evaluation for Target Indicated Torque Based Engine Starting Control Strategy in a High Pressure Common Rail Diesel Engine

Lin

Xiao²,

Li³

2016

Mathematical Problems in Engineering

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The diesel engine power demand of the start condition can be separated into two parts including resistance overcoming and acceleration realization for the reason that there is no power output during the starting process. The present paper mainly focuses on the fuel injection quantity control based on the engine power demand especially the acceleration demand for the resistance force is fixed for a specific engine, and the starting acceleration velocity is set as a target curve so that the acceleration process can also be fixed. The feasibility of the start control strategy proposed in this paper was verified by a comparison of the traditional starting control with a constant fuel quantity, and starting performance of the target acceleration based control shows predominance to the constant quantity control. And then the comparison between various starting acceleration processes, which was realized by the settings of acceleration curve slope factor, was conducted and results showed that the acceleration processes with higher slope factors perform better.

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The effects of unburned hydrocarbon recirculation on ignition and combustion during diesel engine cold starts

Cited by 10 publications

References 27 publications

Experimental analysis of the influence of coolant and oil temperature on combustion and emissions in an automotive diesel engine

Experimental analysis of the influence of coolant and oil temperature on combustion and emissions in an automotive diesel engine

The Impact of Changing the Fuel Dose on Chosen Parameters of the Diesel Engine Start-Up Process

Design and Evaluation for Target Indicated Torque Based Engine Starting Control Strategy in a High Pressure Common Rail Diesel Engine

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