A study on characteristics and control strategies of cold start operation for improvement of harmful exhaust emissions in SI engines

Kim, Duk-Sang; Park, Young‐Joon; Lee, Seangwock; Cho, Yong-Seok

doi:10.1007/s12206-007-1017-6

Cited by 8 publications

(4 citation statements)

References 7 publications

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“…This results in the exhaust gas recirculation (EGR) rate. This method leads to reduction of NOx and HC emissions and accelerate warming up of inlet manifold, which in turn helps to homogenize the fuel mixture for better combustion [13,[21][22][23][24]. In addition, the increase in VO improves engine volumetric efficiency at higher engine speeds than normal idle engine speed and consequently increases engine efficiency and increase engine speed [19].…”

Section: Control Strategy In Cold Start Conditionmentioning

confidence: 99%

Modelling and Fuzzy-Threshold Control of SI Engine for Emission Reduction during Cold Start Phase

Khalilikhah

Shalchian

2019

IJAME

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We present a controllable model of an internal combustion engine that captures the overlapping of the cylinder valves as a controllable parameter and its effect on engine efficiency and EGR rates. The model parameters have been calibrated for the EF7 engine and validated with experimental data. This model successfully estimates the performance and HC and NOx emissions concentration of the engine under cold start operating condition. A model-based fuzzy-threshold control strategy has been proposed in cold start operating condition. This strategy uses the overlapping angle of the cylinder inlet and outlet valves as an extra degree of freedom in comparison to the regular PID strategy in order to accelerate the warm-up duration the catalyst converter while reduces the exhaust harmful emissions during the warm-up phase. The proposed controller model has been verified in MATLAB Simulink environment and simulation results indicates 8.6% reduction of the start-up time of the catalyst converter and reduction of 3.5%, 8.5% and 7% of HC, NO and fuel consumption respectively during the catalyst warm-up phase.

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Section: Control Strategy In Cold Start Conditionmentioning

confidence: 99%

Modelling and Fuzzy-Threshold Control of SI Engine for Emission Reduction during Cold Start Phase

Khalilikhah

Shalchian

2019

IJAME

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“…Optimal control of the fuel injection timing improved the cold-start reliability and also reduced the cold-start HC emissions of the engine. Kim et al 20 analysed the effects of ignition and the exhaust valve timing on the combustion stability and the emission characteristics by cold-start bench tests on an SI engine. According to the experimental results, an advanced exhaust valve timing and retarded ignition were plausible in order to achieve a reduction in the exhaust emissions while stability can be maintained under the cold-start operation of SI engines.…”

Section: Introductionmentioning

confidence: 99%

Influences of the fuel injection parameters on the first-cycle firing and the combustion characteristics during the direct-start process for a gasoline direct-injection engine

Xie

Wei

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part D:

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The direct-start method without requiring a starter is a viable and cost-effective solution for generating a frequent and efficient restarting process when start–stop technology is used on a gasoline direct-injection engine. During the direct-start process, the first-cycle combustion characteristics play a key role in determining whether the start mode is successful or not, because the start energy is wholly derived from the in-cylinder combustion without the support of a starter motor on the gasoline direct-injection engine. However, the first-cycle fuel–air mixing and combustion characteristics during the direct-start process of a gasoline direct-injection engine are not fully understood. In this work, the influences of the injection parameters, including the delay between the injection and ignition, the excess air ratio for the single-injection strategy, the delay between the first injection and the second injection for the dual-injection strategy and the ratio of the fuel mass in the first injection to the fuel mass in the second injection for the dual-injection strategy, on the combustion pressure, the heat release rate, the accumulated heat release and the indicated work were investigated experimentally by cycle-by-cycle analysis. The results show that the optimal delay between the injection and ignition of the single-injection strategy was 200 ms as a longer delay or a shorter delay can result in a reduction in the heat released rate, the indicated work and the firing boundary. A shorter delay with the optimal injected fuel mass tended to be more beneficial to the accumulated heat released, the indicated work and the crankshaft speed. Furthermore, with increasing delay and increasing fuel ratio of the fuel mass in the first injection to the fuel mass in the second injection for the dual-injection strategy, the heat release rate, the accumulated heat release and the indicated work first increased and then decreased. The optimum delay was 10 ms and the ratios of the fuel mass in the first injection to the fuel mass in the second injection were 4/1 and 5/1 respectively under the test conditions. Additionally, the dual-injection strategy with an optimized control parameter produced a higher heat release and higher indicated work than the single-injection strategy did.

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“…Specifically, within the last decades engine emissions have been reduced significantly adopting new aftertreatment strategies [1][2][3][4][5]. To this purpose, a host of investigations has been focused on oxidation catalysts (OC), diesel particulate filters (DPF), lean NO x traps (LNT), lean NO x catalysts (LNC), and selective catalytic reductions (SCR) [6][7][8][9][10][11][12]. Nevertheless, further improvements are necessary to meet the more and more stringent exhaust regulations, to improve the energetic effectiveness of modern emission control systems and to balance costs and fuel economy benefits.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on the energetic performances of conventional and pellet aftertreatment systems in flow-through and reverse-flow designs

Morrone¹,

Algieri²

2011

THERM SCI

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The aim of the paper is the analysis of the energetic performances of structured and pelletized aftertreatment systems in flow-through and reverse-flow designs (passive and active flow control respectively) for diesel internal combustion engines. To this purpose, the influence of the engine operating conditions on the system performances has been investigated adopting a one-dimensional time-dependent model. Specifically, the thermal behaviour and the fuel saving capability of several arrangements have been characterized. The analysis has shown that the active emission control system with pelletized design guarantees higher heat retention capability. Furthermore, the numerical model has revealed the significant influence of the solid and exhaust gas temperature on the energy efficiency of the aftertreatment systems and the large effect of exhaust mass flow rate and unburned hydrocarbons concentration

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A study on characteristics and control strategies of cold start operation for improvement of harmful exhaust emissions in SI engines

Cited by 8 publications

References 7 publications

Modelling and Fuzzy-Threshold Control of SI Engine for Emission Reduction during Cold Start Phase

Modelling and Fuzzy-Threshold Control of SI Engine for Emission Reduction during Cold Start Phase

Influences of the fuel injection parameters on the first-cycle firing and the combustion characteristics during the direct-start process for a gasoline direct-injection engine

Numerical investigation on the energetic performances of conventional and pellet aftertreatment systems in flow-through and reverse-flow designs

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