Modelling the Exhaust Gas Recirculation Mass Flow Rate in Modern Diesel Engines

Yang, Zhijia; Winward, Edward; O'Brien, G.J.; Stobart, Richard; Zhao, Dezong

doi:10.4271/2016-01-0550

Cited by 8 publications

(5 citation statements)

References 28 publications

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“…The lift of the EGR valve was 3.7 mm (about 30% of full valve opening) corresponding to the EGR rate in the range 30-40%, similarly to the system described in [65].…”

Section: Cfd Model Of the Egr Valvementioning

confidence: 85%

Effect of deposition of carbon deposits on charge flow in EGR valve in CI engine

Woźniak¹,

Siczek²,

Zakrzewski³

et al. 2022

Combustion Engines

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The exhaust gas recirculation (EGR) valve regulates the exhaust gas flow between the engine exhaust manifold and the inlet one. This allows the inlet air to warm up, improving fuel evaporation and reducing the combustion temperature of the charge. Such a valve reduces the number of harmful substances in the exhaust gas. The valve sticks when too much sediment builds on the walls of the exhaust system, especially during driving in urban conditions or when leaks in the vacuum or exhaust pipes occur. A faulty valve causes the engine to run unevenly at idle speed and under light loads. The defective EGR valve weakens the inlet manifold capacity, increases combustion, clogging of the particulate filter, damage to the lambda probe. A blocked EGR valve may lead to engine immobilization as a result of the operation of its computerized control system. A model of the EGR valve of a selected diesel engine was developed to determine the velocity distribution of the load flowing in it for different values of the degree of valve opening and the volume of deposits on the valve walls. The volume of accumulated carbon deposits on the walls of the EGR valve was measured using a real engine. Based on the recorded mileage of the vehicle, the assumed average speed of the car, and the driving style of the driver, the intensity of deposition of carbon particles on the walls was estimated.

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“…The lift of the EGR valve was 3.7 mm (about 30% of full valve opening) corresponding to the EGR rate in the range 30-40%, similarly to the system described in [65].…”

Section: Cfd Model Of the Egr Valvementioning

confidence: 85%

Effect of deposition of carbon deposits on charge flow in EGR valve in CI engine

Woźniak¹,

Siczek²,

Zakrzewski³

et al. 2022

Combustion Engines

View full text Add to dashboard Cite

show abstract

“…The tendencies of the EGR mass flow rate growth in function of the supporter exhaust brake closing was lower than the other signals. There are several articles where this method was validated, as was mentioned above [ 19 , 20 , 21 ]. In this case, this estimation method could be improved by further analysis, the mass conservation law based estimation method for the EGR mixer did not provide realistic signals.…”

Section: Discussionmentioning

confidence: 99%

“…In this process, there are similar changes: pressure, temperature and composition. By the pressures, the processes can be estimated with the orifice equations [ 19 ]. For composition change equations, the air fraction or the burnt gas fraction are typically used [ 22 ].…”

Section: Exhaust Gas Recirculationmentioning

confidence: 99%

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Verification and Comparison of Nine Exhaust Gas Recirculation Mass Flow Rate Estimation Methods

Nyerges

Zöldy

2020

Sensors

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Modern Diesel engines have complex exhaust gas recirculation (EGR) systems. Due to the high temperatures, it is a typical issue to measure EGR mass flow rates in these complex control systems. Therefore, it is expedient to estimate it. Several sensed values can help the estimation: the fresh air mass flow rate, the fuel consumption, pressures, temperatures and mass fractions in the air path system. In most of the articles, the EGR mass flow rate estimation is done by the pressures. However, gas composition based models usually would be better for control aims. In this paper, nine EGR estimation methods will be presented: an important outcome is to present the required sensor architectures and estimation challenges. The comparison will be made by measurement results both in stationary operation points and transient cycles. The estimated EGR mass flow rates will be evaluated by verification conditions. The results will prove that the intake and exhaust side oxygen sensors can give verifiable signals for EGR mass flow rate estimation. In contrast, the applied fresh air mass flow rate and the nitrogen-oxide signals are not accurate enough to provide verifiable EGR mass flow rates in every operating condition. The effects of sensor inaccuracies will also be considered.

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“…It is thus fundamental to highlight that a key role is played by the oxygen fraction at the engine intake since it has a great impact on the temperature shift due to combustion. Its value can be determined once the fresh air mass is known (by MAF) and EGR mass is computed [9,10]. The simplest way to estimate the latter component is by subtracting fresh air mass to the global cylinder trapped one.…”

Section: Model Structurementioning

confidence: 99%

Validation of a NOx estimation methodology based on the analysis of in-cylinder pressure trace

2018

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District heating networks are commonly addressed in the literature as one of the most effective solutions for decreasing the greenhouse gas emissions from the building sector. These systems require high investments which are returned through the heat sales. Due to the changed climate conditions and building renovation policies, heat demand in the future could decrease, prolonging the investment return period. The main scope of this paper is to assess the feasibility of using the heat demand -outdoor temperature function for heat demand forecast. The district of Alvalade, located in Lisbon (Portugal), was used as a case study. The district is consisted of 665 buildings that vary in both construction period and typology. Three weather scenarios (low, medium, high) and three district renovation scenarios were developed (shallow, intermediate, deep). To estimate the error, obtained heat demand values were compared with results from a dynamic heat demand model, previously developed and validated by the authors. The results showed that when only weather change is considered, the margin of error could be acceptable for some applications (the error in annual demand was lower than 20% for all weather scenarios considered). However, after introducing renovation scenarios, the error value increased up to 59.5% (depending on the weather and renovation scenarios combination considered). The value of slope coefficient increased on average within the range of 3.8% up to 8% per decade, that corresponds to the decrease in the number of heating hours of 22-139h during the heating season (depending on the combination of weather and renovation scenarios considered). On the other hand, function intercept increased for 7.8-12.7% per decade (depending on the coupled scenarios). The values suggested could be used to modify the function parameters for the scenarios considered, and improve the accuracy of heat demand estimations.

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Modelling the Exhaust Gas Recirculation Mass Flow Rate in Modern Diesel Engines

Cited by 8 publications

References 28 publications

Effect of deposition of carbon deposits on charge flow in EGR valve in CI engine

Effect of deposition of carbon deposits on charge flow in EGR valve in CI engine

Verification and Comparison of Nine Exhaust Gas Recirculation Mass Flow Rate Estimation Methods

Validation of a NOx estimation methodology based on the analysis of in-cylinder pressure trace

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