Synergies between High EGR Operation and GDI Systems

Alger, Terrence; Chauvet, Thierry; Dimitrova, Zlatina

doi:10.4271/2008-01-0134

Cited by 143 publications

(63 citation statements)

References 22 publications

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“…These results are within the results found by Alger et al [12], Cairns et al [9] and Zhong et al [14] in their research works. Figure 11a confirm how a sharp fuel consumption reduction was achieved by introducing 4% of EGR due to the fuel enrichment elimination, maintaining the exhaust gas temperature at almost the same value as the reference operating conditions but operating in stoichiometric conditions.…”

Section: Combustion and Engine Performancesupporting

confidence: 82%

“…Kumano et al [11] also followed the same line of research on knocking suppression combining simulation and testing activities, quantifying in a 0.3% of fuel consumption reduction per 1% of EGR added. Alger et al [12] reported the synergy between cooled EGR and GDI technologies obtaining reduction in fuel consumption of 4% in low and partial load primary through the reduction in pumping losses and 15%-20% at high load due to the improvement of combustion phasing, which is the time where the combustion process takes place in the engine cycle, and fuel enrichment elimination. Cairns et al [13] evaluated different cooled EGR loop configurations and their advantages and disadvantages, and Zhong et al [14] also discussed about different cooled EGR systems in a turbocharged SI engine.…”

Section: Introductionmentioning

confidence: 99%

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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: Combustion and Engine Performancesupporting

confidence: 82%

Section: Introductionmentioning

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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“…The exhaust piezoresistive sensor cooling system was redesign due to the inaccurate measurements effect of the high exhaust gas temperature of this engine. The details of the cooling system redesign are explained in Benajes et al work [1], where a methodology was developed to address the problem and a solution was found. …”

Section: Control and Acquisition Systemmentioning

confidence: 99%

“…The CI diesel engine had gained more popularity in the last 20 years for mass production cars in Europe than in the rest of the world due to the lighter pollutant emissions regulations and the stimulus provided by some European countries, this lead to increase the percentage of diesel powered cars [1]. Nowadays in Europe, 50% of the total car population are using CI diesel engine.…”

Section: Introductionmentioning

confidence: 99%

“…SI gasoline engines have been the main choice for passenger cars around the world [1], since the invention of the car, until the late 90's when CI diesel engines development in Europe started to gain popularity thanks to their lower fuel consumption, the increase in fuel prices and the government aids [2]. On the other hand, the situation in Japan was undergoing the same path until the Japanese government restricted in a harder manner the emissions targets for diesel engines in passenger cars [2] and they considered diesels to be a dead-end technology environmentally: "When equipped with all future aftertreatment equipment, diesel cars will become as expensive as hybrid cars", says Katsuhiko Hirose, hybrid project general manager for Toyota [3].…”

Section: Introductionmentioning

confidence: 99%

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Assessment of fuel consumption reduction strategies on a gasoline turbocharged direct injection engine with a cooled EGR system

Perea¹,

Eduardo²

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Resumen. El objetivo de este trabajo de investigación es estudiar la influencia de un lazo de baja presión de EGR en las prestaciones de un motor de gasolina de encendido provocado turbosobrealimentado e inyección directa, en condiciones de ensayos estacionarios y transitorios, con un proceso de optimización de la calibración original del motor para minimizar el consumo de combustible del motor. La estrategia de "cooled EGR" fue también evaluada operando en sinergia con otras estrategias usadas para reducir el consumo de combustible del motor, entre ellas: mezcla pobre, múltiples inyecciones, operación a alta temperatura del fluido refrigerante del motor y movimiento de "swirl" inducido en el cilindro. Para cumplir con los objetivos mencionados, se siguió un proceso metódico donde previamente se desarrolló una metodología global para obtener resultados de indudable calidad, basados en el uso de herramientas experimentales que cumplieran con los requerimientos de las condiciones de ensayo, y las apropiadas herramientas teóricas y procedimiento para post-procesar los ensayos realizados. En segundo lugar, se desarrolló una metodología específica para cada etapa del estudio, teniendo en cuenta los procesos de optimización o estudios paramétricos que se pudieran realizar.Como primera etapa, se presenta un estudio básico del impacto del "cooled EGR" en la combustión, prestaciones, renovación de la carga y emisiones contaminantes del motor. Seguidamente, se procedió a la optimización del centrado de la combustión con la finalidad de minimizar el consumo de combustible del motor y poder analizar el potencial del "cooled EGR" como estrategia de reducción de consumo de combustible. El estudio presentado se realizó para baja, media y alta carga del motor con dos diferentes regímenes de giro del motor. Adicionalmente, se llevó a cabo un estudio del motor operando en condiciones transitorias con "cooled EGR". Se realizaron una serie de ensayos usando el ciclo NEDC como base y se probaron diferentes estrategias sencillas de control de la apertura de la válvula de EGR para analizar la influencia del "cooled EGR" en condiciones transitorias.La segunda etapa consiste en el desarrollo de una metodología para optimizar los parámetros del diagrama de distribución (VVT) y el inicio de inyección, para cargas medias del motor, con la finalidad de maximizar el potencial de reducción de consumo de combustible de la estrategia "cooled EGR". Una vez realizada la optimización, se llevó a cabo un estudio usando la configuraciónóptima encontrada, operando en sinergia con otras tres estrategias usadas para reducir el consumo de combustible del motor. Estas estrategias fueron evaluadas con la finalidad de incrementar el rango de operación de la estrategia "cooled EGR" para lograr reducir aún más el consumo de combustible del motor. Adicionalmente, se llevó a cabo un estudio básico sobre la influencia de operar con mezcla pobre en la combustión, prestaciones, renovación de la carga y emisiones contaminantes del motor, como introducción alúltimo...

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The effects of EGR and ignition timing on emissions of GDI engine

Zhao

Dingchao

et al. 2013

Sci. China Technol. Sci.

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Synergies between High EGR Operation and GDI Systems

Cited by 143 publications

References 22 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

Assessment of fuel consumption reduction strategies on a gasoline turbocharged direct injection engine with a cooled EGR system

The effects of EGR and ignition timing on emissions of GDI engine

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