Decoupling Temperature and Oxygen for DPF Regeneration

Stringent emission regulations (e.g., Euro-6) force automotive manufacturers to equip DPF (diesel particulate filter) on diesel cars. Generally, post injection is used as a method to regenerate DPF. However, it is known that post injection deteriorates specific fuel consumption and causes oil dilution for some operating conditions. Thus, an injection strategy for regeneration becomes one of key technologies for diesel powertrain equipped with a DPF. This paper presents correlations between fuel injection strategy and exhaust gas temperature for DPF regeneration. Experimental apparatus consists of a single cylinder diesel engine, a DC dynamometer, an emission test bench, and an engine control system. In the present study, post injection timing covers from 40 deg aTDC to 110 deg aTDC and double post injection was considered. In addition, effects of injection pressures were investigated. The engine load was varied from low-load to mid-load and fuel amount of post injection was increased up to 10mg/stk. Oil dilution during fuel injection and combustion processes were estimated by diesel loss measured by comparing two global equivalences ratios; one is measured from Lambda sensor installed at exhaust port, the other one is estimated from intake air mass and injected fuel mass. In the present study, the differences in global equivalence ratios were mainly caused from oil dilution during post injection. The experimental results of the present study suggest an optimal engine operating conditions including fuel injection strategy to get appropriate exhaust gas temperature for DPF regeneration. Experimental results of exhaust gas temperature distributions for various engine operating conditions were summarized. In addition, it was revealed that amounts of oil dilution were reduced by splitting post injection (i.e., double post injection). Effects of injection pressure on exhaust gas temperature were dependent on combustion phasing and injection strategies.

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The role of the driving dynamics beyond RDE limits and DPF regeneration events on pollutant emissions of a Euro 6d-temp passenger vehicle

Journal of Aerosol Science ◽

10.1016/j.jaerosci.2021.105947 ◽

2021 ◽

pp. 105947

Author(s):

Z. Toumasatos ◽

A. Raptopoulos-Chatzistefanou ◽

D. Kolokotronis ◽

P. Pistikopoulos ◽

Z. Samaras ◽

...

Keyword(s):

Pollutant Emissions ◽

Passenger Vehicle ◽

Dpf Regeneration

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Particle emission characteristics of DPF regeneration from DPF regeneration bench and diesel engine bench measurements

Fuel ◽

10.1016/j.fuel.2019.116589 ◽

2020 ◽

Vol 262 ◽

pp. 116589 ◽

Cited By ~ 16

Author(s):

Zhongwei Meng ◽

Chao Chen ◽

Jiansong Li ◽

Jia Fang ◽

Jie Tan ◽

...

Keyword(s):

Diesel Engine ◽

Particle Emission ◽

Emission Characteristics ◽

Dpf Regeneration

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Effect of the Fuel Injection Strategy on Diesel Particulate Filter Regeneration in a Single-Cylinder Diesel Engine

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.4033161 ◽

2016 ◽

Vol 138 (10) ◽

Cited By ~ 5

Author(s):

Sungjun Yoon ◽

Hongsuk Kim ◽

Daesik Kim ◽

Sungwook Park

Keyword(s):

Fuel Injection ◽

Injection Pressure ◽

Operating Conditions ◽

Particulate Filter ◽

Exhaust Gas ◽

Gas Temperature ◽

Diesel Particulate ◽

Injection Strategy ◽

Dpf Regeneration ◽

Exhaust Gas Temperature

Stringent emission regulations (e.g., Euro-6) have forced automotive manufacturers to equip a diesel particulate filter (DPF) on diesel cars. Generally, postinjection is used as a method to regenerate the DPF. However, it is known that postinjection deteriorates the specific fuel consumption and causes oil dilution for some operating conditions. Thus, an injection strategy for regeneration is one of the key technologies for diesel powertrains equipped with a DPF. This paper presents correlations between the fuel injection strategy and exhaust gas temperature for DPF regeneration. The experimental apparatus consists of a single-cylinder diesel engine, a DC dynamometer, an emission test bench, and an engine control system. In the present study, the postinjection timing was in the range of 40 deg aTDC to 110 deg aTDC and double postinjection was considered. In addition, the effects of the injection pressure were investigated. The engine load was varied among low load to midload conditions, and the amount of fuel of postinjection was increased up to 10 mg/stk. The oil dilution during the fuel injection and combustion processes was estimated by the diesel loss measured by comparing two global equivalences ratios: one measured from a lambda sensor installed at the exhaust port and one estimated from the intake air mass and injected fuel mass. In the present study, the differences of the global equivalence ratios were mainly caused by the oil dilution during postinjection. The experimental results of the present study suggest optimal engine operating conditions including the fuel injection strategy to obtain an appropriate exhaust gas temperature for DPF regeneration. The experimental results of the exhaust gas temperature distributions for various engine operating conditions are discussed. In addition, it was revealed that the amount of oil dilution was reduced by splitting the postinjection (i.e., double postinjection). The effects of the injection pressure on the exhaust gas temperature were dependent on the combustion phasing and injection strategies.

Download Full-text