Energy-efficient heating strategies of diesel oxidation catalyst for low emissions vehicles

Hamedi, Mohammad Reza; Doustdar, Omid; Tsolakis, Athanasios; Hartland, Jonathan

doi:10.1016/j.energy.2021.120819

Cited by 26 publications

(7 citation statements)

References 45 publications

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“…Although there are differences in the absolute levels between different vehicles, the cold start still remains the main contributor in most cases, and it needs to be controlled better. Thermal management methods, such as those based on burners, reformers, and electrically heated catalysts, might further decrease cold start emissions, and a degree of electrification might be necessary [27,[86][87][88][89]. However, in some cases, urban emissions of hybrid electric vehicles might be higher due to the longer time needed for the catalyst to warm up; thus, further calibration efforts are needed [32,90].…”

Section: Discussionmentioning

confidence: 99%

Effect of Extreme Temperatures and Driving Conditions on Gaseous Pollutants of a Euro 6d-Temp Gasoline Vehicle

et al. 2021

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Gaseous emissions of modern Euro 6d vehicles, when tested within real driving emissions (RDE) boundaries, are, in most cases, at low levels. There are concerns, though, about their emission performance when tested at or above the boundaries of ambient and driving conditions requirements of RDE regulations. In this study, a Euro 6d-Temp gasoline direct injection (GDI) vehicle with three-way catalyst and gasoline particulate filter was tested on the road and in a laboratory at temperatures ranging between −30 °C and 50 °C, with cycles simulating urban congested traffic, uphill driving while towing a trailer at 85% of the vehicle’s maximum payload, and dynamic driving. The vehicle respected the Euro 6 emission limits, even though they were not applicable to the specific cycles, which were outside of the RDE environmental and trip boundary conditions. Most of the emissions were produced during cold starts and at low ambient temperatures. Heavy traffic, dynamic driving, and high payload were found to increase emissions depending on the pollutant. Even though this car was one of the lowest emitting cars found in the literature, the proposed future Euro 7 limits will require a further decrease in cold start emissions in order to ensure low emission levels under most ambient and driving conditions, particularly in urban environments. Nevertheless, motorway emissions will also have to be controlled well.

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Section: Discussionmentioning

confidence: 99%

Effect of Extreme Temperatures and Driving Conditions on Gaseous Pollutants of a Euro 6d-Temp Gasoline Vehicle

et al. 2021

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“…In strategy B, when T target1 and T target2 were both set to 200 • C (B200), the CO, HC, and NO x emissions were reduced by about 80%, 80%, and 66%, respectively, while the CO 2 increased by 9.35% (as given in Figure 10c). In [139], a pulsating heating strategy with a pulse width of 30 s led to an approximate 70% and 24% reduction in the CO and HC emissions, respectively, under the NEDC. Compared with the typical heating strategy, the pulsating heating strategy increased the CO and HC conversion efficiency by 34% and 31%, respectively.…”

Section: Thermal Insulationmentioning

confidence: 99%

A Review of Thermal Energy Management of Diesel Exhaust after-Treatment Systems Technology and Efficiency Enhancement Approaches

Wu,

Feng,

et al. 2024

Energies

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The DOC (diesel oxidation catalyst), DPF (diesel particulate filter), SCR (selective catalytic reduction), and ASC (ammonia slip catalyst) are widely used in diesel exhaust after-treatment systems. The thermal management of after-treatment systems using DOC, DPF, SCR, and ASC were investigated to improve the efficiency of these devices. This paper aims to identify the challenges of this topic and seek novel methods to control the temperature. Insulation methods and catalysts decrease the energy required for thermal management, which improves the efficiency of thermal management. Thermal insulation decreases the heat loss of the exhaust gas, which can reduce the after-treatment light-off time. The DOC light-off time was reduced by 75% under adiabatic conditions. A 400 W microwave can heat the DPF to the soot oxidation temperature of 873 K at a regeneration time of 150 s. An SCR burner can decrease NOx emissions by 93.5%. Electrically heated catalysts can decrease CO, HC, and NOx emissions by 80%, 80%, and 66%, respectively. Phase-change materials can control the SCR temperature with a two-thirds reduction in NOx emissions. Pt-Pd application in the catalyst can decrease the CO light-off temperature to 113 °C. Approaches of catalysts can enhance the efficiency of the after-treatment systems and reduce the energy consumption of thermal management.

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“…To test the impacts of the parameters of the electrical heating method on the exhaust purifying efficiency, Hamedi M.R. et al [36] electrically heated the exhaust system of a Euro V standard diesel engine. It has been discovered that heating upstream of the DOC could produce better exhaust cleanup results than heating the DOC carrier directly or heating its exterior.…”

Section: Application To Diesel Vehiclesmentioning

confidence: 99%

Applications of Electric Heating Technology in Vehicle Exhaust Pollution Control

Li,

Xiao,

Wang

et al. 2024

Processes

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Motor vehicle exhaust is an important cause of atmospheric pollution. Nowadays, mainstream exhaust emission aftertreatment technologies, such as TWC, DOC, SCR, and DPF, usually require sufficient temperature to perform good purification or maintain normal working conditions. Compared with exhaust gas heating technologies such as engine enrichment and fuel injection, electric heating technology can quickly increase the temperature of exhaust gas aftertreatment devices without adverse effects on engine operating conditions. This article introduces the research and progress of electric heating technology combined with traditional aftertreatment devices on major types of vehicles, such as gasoline vehicles, diesel vehicles, motorcycles, and hybrid vehicles, to improve exhaust purification efficiency and its accompanying fuel consumption impact. In addition, the common structure and characteristics of electric heaters, as well as the current status and development trend of electric heating unit technologies such as electric heating power supply are introduced.

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Energy-efficient heating strategies of diesel oxidation catalyst for low emissions vehicles

Cited by 26 publications

References 45 publications

Effect of Extreme Temperatures and Driving Conditions on Gaseous Pollutants of a Euro 6d-Temp Gasoline Vehicle

Effect of Extreme Temperatures and Driving Conditions on Gaseous Pollutants of a Euro 6d-Temp Gasoline Vehicle

A Review of Thermal Energy Management of Diesel Exhaust after-Treatment Systems Technology and Efficiency Enhancement Approaches

Applications of Electric Heating Technology in Vehicle Exhaust Pollution Control

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