Influence of measurement errors and estimated parameters on combustion diagnosis

Payri, F.; Molina, Santiago; Martín, Javier Rodríguez; Armas, Octavio

doi:10.1016/j.applthermaleng.2005.05.006

Cited by 153 publications

(127 citation statements)

References 11 publications

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“…An influence of measurement errors and estimated parameters, using the described combustion diagnosis model, was performed by Payri et al in their research work [22], where a detailed explanation of the …”

Section: Diagnostic Of the Combustion Processmentioning

confidence: 99%

Influence of a low pressure EGR loop on a gasoline turbocharged direct injection engine

Luján

Climent

Novella

et al. 2015

Applied Thermal Engineering

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This paper presents an experimental study of a low pressure EGR loop on a spark ignition (SI) Gasoline Turbocharged Direct Injection (GTDI) engine that will improve the understanding on the advantages and disadvantages of this strategy. Two steady engine operating conditions were investigated, 10 bar and 17 bar at 2000 rpm. At partial load conditions a combustion, performance, air management and exhaust gas emissions study was performed in order to analyses the EGR effect on the GTDI engine. The main advantages found were the reduction in fuel consumption due to the better combustion phasing, and the reduction in pumping losses and heat losses through the cylinder walls. A reduction on NOx, CO and soot was also observed when introducing EGR at these operating conditions. The main disadvantage found was the water condensation after the intercooler. At high load conditions similar analysis and conclusions to the partial load conditions are obtained. The EGR also allowed the combustion to be phased in a more efficient angle by reducing the risk of knocking, which helped reduce the exhaust gas temperature, despite the elimination of the fuel enrichment strategy. A reduction on CO and soot raw emissions was also observed when introducing EGR, as observed at partial load conditions, but a high reduction in NOx, CO, HC and soot emissions was observed after the catalyst since the fuel enrichment strategy is eliminated when cooled EGR is introduced. The main disadvantage found was the turbocharger limitation since higher compression ratio is required in order to keep the same air mass flow as the reference conditions without EGR. The original turbocharger is not designed to provide this higher compression ratio at low engine speed and high load. Results confirm how introducing EGR is a suitable strategy to control knocking and reduce simultaneously exhaust gas temperature and fuel consumption, but the disadvantages found in this investigation must be solved to assure its feasibility as a powerful technology to be implemented in future SI engines.

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Section: Diagnostic Of the Combustion Processmentioning

confidence: 99%

Influence of a low pressure EGR loop on a gasoline turbocharged direct injection engine

Luján

Climent

Novella

et al. 2015

Applied Thermal Engineering

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“…Along with these two basic equations, several sub-models: a filling and emptying model was used to calculate the trapped mass [27]; the specific heat of the gas depends on both temperature and composition [28]; blow-by model was based on the evolution of the gas in an isentropic nozzle [26]; the chamber volume deformation due to pressure and inertia was calculated by means of a simple deformation model [29];the heat transfer coefficient in the chamber walls was calculated with a modified Woschnilike model [30]:…”

Section: In-cylinder Pressure Signal Analysismentioning

confidence: 99%

In-cylinder soot radiation heat transfer in direct-injection diesel engines

Benajes

Martín

García

et al. 2015

Energy Conversion and Management

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HIGHLIGHTSOptoelectronic pyrometer provides similar results compared with a conventional method Lower injection pressure results in higher radiation Higher ambient temperature and higher in-cylinder gas density produce higher radiation Larger lift-off length reduces the soot volume fraction and the spectral intensity An increase on swirl number, load and CA50 provide a lower total radiation Lower values of EGR implies a decreased on radiation intensity KEYWORDSSoot; in-cylinder heat transfer; radiation; Optical pyrometer; ABSTRACTThe efficiency and CO 2 are one of the main concerns of automotive manufacturers.There are several strategies under investigation to solve this problem. In the present work, the research effort has been focused on improving knowledge of in-cylinder heat transfer and its impact on engine efficiency. In particular, soot radiation was studied since it can be considered a significant source of the efficiency losses in modern diesel engines. Considering previous studies, the portion of total chemical energy released during combustion lost due to radiation heat transfer varies widely from 0.5 up to 10%, depending on engine parameters and combustion process. Thus, the main objective of this work was to evaluate the amount of energy lost to soot radiation relative to the input fuel chemical energy during the combustion event under different operating conditions in a completely controlled environment provided by an optical engine. Under these simplified conditions, two-color method was applied by using high speed imaging pyrometer with cameras (two dimensional results) and optoelectronic pyrometer (zero dimensional results). Once a detailed comparison between both diagnostics was performed, optoelectronic pyrometer was used to characterize radiant energy losses in a fully instrumented 4-cylinder direct-injection light-duty diesel engine. In particular swirl ratio, EGR and combustion phasing effects on radiation heat transfer were evaluated.

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“…The instantaneous velocity was obtained from a combustion diagnostics code [21]. The intake and exhaust gas temperatures and heat transfer coefficients, obtained from the Nusselt number, were averaged over a cycle in a way similar to that used for the in-cylinder mean film coefficient and the apparent gas temperature.…”

Section: Runner -Gas Heat Transfermentioning

confidence: 99%

A Tool for Predicting the Thermal Performance of a Diesel Engine

Torregrosa

Olmeda

Martín

et al. 2011

Heat Transfer Engineering

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Abstract.This paper presents a thermal network model for the simulation of the transient response of diesel engines. The model was adjusted by using experimental data from a completely instrumented engine run under steady-state and transient conditions. Comparisons between measured and predicted material temperatures over a wide range of engine running conditions show a mean error of 7ºC. The model was then used to predict the thermal behavior of a different engine. Model results were checked against oil and coolant temperatures measured during engine warm-up at constant speed and load, and on a New European Driving Cycle. Results show that the model predicts these temperatures with a maximum error of 3ºC.3

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Influence of measurement errors and estimated parameters on combustion diagnosis

Cited by 153 publications

References 11 publications

Influence of a low pressure EGR loop on a gasoline turbocharged direct injection engine

Influence of a low pressure EGR loop on a gasoline turbocharged direct injection engine

In-cylinder soot radiation heat transfer in direct-injection diesel engines

A Tool for Predicting the Thermal Performance of a Diesel Engine

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