Characteristics of Integrated Air Control and Low-Pressure Exhaust Gas Recirculation Valve for Diesel Engines

Jeong, Byeong Gyu; Won, Jang Hyeok; Oh, Kwang Chul; Heo, Hyung-Seok; Bae, Seokjeong; Seo, Hyung Jun; Kim, Ho-Young

doi:10.1007/s12239-020-0023-x

Cited by 4 publications

(2 citation statements)

References 3 publications

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“…Despite their merits, CI engines are notorious for their emissions of harmful air pollutants, particularly nitrogen oxides (NO x ) and particulate matter (PM) due to the presence of both locally fuel-rich zone and high flame temperature [1,3]. High-pressure multiple injection [4,5] and exhaust gas recirculation (EGR) [6] were developed to address these issues. However, relying solely on in-cylinder emission control strategies proves inadequate for simultaneously reducing both emissions due to the inherent trade-off between NO x and PM in conventional CI engines.…”

Section: Introductionmentioning

confidence: 99%

Variable Valve Actuation for Efficient Exhaust Thermal Management in an Off-Road Diesel Engine

Kim,

Vallinmaki,

Tuominen

et al. 2024

Preprint

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Section: Introductionmentioning

confidence: 99%

Variable Valve Actuation for Efficient Exhaust Thermal Management in an Off-Road Diesel Engine

Kim,

Vallinmaki,

Tuominen

et al. 2024

Preprint

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“…However, diesel engines also have high levels of particulate matter (PM) and nitrogen oxide (NOx) emissions due to the coexistence of local fuel-rich areas and hightemperature flame zones within the combustion chamber [1,2]. To solve these problems, the engine itself has been improved, and technologies such as in-cylinder combustion using high-pressure multi-fuel injection [3,4] and exhaust gas recirculation (EGR) have been developed [5][6][7]; however, advancements in engine technology alone cannot be enough to meet increasingly stringent exhaust regulations. Therefore, aftertreatment systems for PM reduction and NOx reduction are additionally applied and now have become essential devices.…”

Section: Introductionmentioning

confidence: 99%

Fuel Consumption and Emission Reduction for Non-Road Diesel Engines with Electrically Heated Catalysts

Lee

et al. 2023

Catalysts

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In this study, an exhaust system compliant with future regulations was developed for a non-road 110PS engine with a Tier-4f aftertreatment system, and the emission characteristics of the engine were investigated in the non-road transient mode (NRTC). For the system to comply with future exhaust regulations, a DPF was installed, and an electrical heated catalyst (EHC) device was installed to manage exhaust gas temperature. The emission characteristics of exhaust gas were examined according to the power and applied duration of EHC, and the effects of catalyst coating and the urea water solution (UWS) injection map on NOx reduction, NH3 slip, and N2O emissions in NRTC mode were investigated. The application of a 4 kW class EHC system enables the lowering of the injection starting temperature of the UWS, as reliable gas heating (heating duration control) is guaranteed. When the injection starting temperature (based on the SCR inlet temperature) was set to 150 °C, NSR map, (III) in conjunction with the operation of the EHC, effectively achieved significant NOx reduction in NRTC mode without deposit and wetting occurring in the mixer and exhaust pipe. Regarding changes in EHC power from 3 kW to 4 kW, it was observed that a NOx reduction of 0.05 g/kWh occurs in the cold NRTC mode, but in the hot NRTC mode, it was found that the relative decrease in the UWS is due to the increased NO2 conversion efficiency as a result of the oxidation catalyst, making 3 kW more advantageous. Furthermore, due to the increase in NO2 concentration caused by the oxidation catalyst and the increase in the low-temperature injected UWS, NH4NO3 was formed, which resulted in an increase in PM emissions and a significant increase in N2O emissions around an exhaust temperature of 250 °C. When the EHC power was set to 3 kW and the volume of oxidation catalyst and the amount of UWS injection were adjusted, applying EHC in the NRTC mode resulted in an additional NOx reduction of 58.6% and 88.4% in cold and hot modes, respectively, compared with not using EHC, with a fuel penalty of approximately 1.67%, while limiting the peak concentrations of N2O and NH3.

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Variable valve actuation for efficient exhaust thermal management in an off-road diesel engine

Kim,

Vallinmaki,

Tuominen

et al. 2024

Applied Thermal Engineering

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Characteristics of Integrated Air Control and Low-Pressure Exhaust Gas Recirculation Valve for Diesel Engines

Cited by 4 publications

References 3 publications

Variable Valve Actuation for Efficient Exhaust Thermal Management in an Off-Road Diesel Engine

Variable Valve Actuation for Efficient Exhaust Thermal Management in an Off-Road Diesel Engine

Fuel Consumption and Emission Reduction for Non-Road Diesel Engines with Electrically Heated Catalysts

Variable valve actuation for efficient exhaust thermal management in an off-road diesel engine

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