Low Pressure Cooled EGR for Improved Fuel Economy on a Turbocharged PFI Gasoline Engine

Song, Dongxian; Ning, Jia; Guo, Xiangyang; Ma, Xingxing; Ma, Zhenliang; Gao, Dingwei; Li, Kejun; Lai, Haipeng; Zhang, Chunhui

doi:10.4271/2014-01-1240

Cited by 20 publications

(6 citation statements)

References 10 publications

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“…Same trend was also observed in another experimental study where it was shown that the resistance to knock is strongly increased by cooled EGR [13]. It was also found that utilization of EGR can significantly reduce emissions by up to 90% [5], [14], [15], while HC emissions increase across the EGR range [16], [17]. Air-fuel ratio can also affect engine knock limit.…”

Section: Introductionsupporting

confidence: 76%

Study on pollutants formation under knocking combustion conditions using an optical single cylinder SI research engine

Karvountzis-Kontakiotis

Vafamehr

Cairns

et al. 2018

Energy

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Section: Introductionsupporting

confidence: 76%

Study on pollutants formation under knocking combustion conditions using an optical single cylinder SI research engine

Karvountzis-Kontakiotis

Vafamehr

Cairns

et al. 2018

Energy

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“…Remark: The nonlinear feedback controller in this paper is designed based on the mean value model of equation 1- (2), in which the dynamic model is designed based on mean value pressure lumping in the manifolds and the pulsations of intake and exhaust manifold pressure are not considered. However, the pulsation of the intake and exhaust manifold pressure are very important for the accurate control of gasoline engine with EGR [24] , the model with considering the pulsation based controller design will be studied in the future research.…”

Section: − *mentioning

confidence: 99%

“…Over the past decades, it has been proved that Cooled external Exhaust Gas Recirculation (cEGR) has a large potential to improve the fuel efficiency of gasoline engines and has gained significant attention on both the academic research field and the industry application field (1)(2)(3)(4)(5) . However, the cooled external EGR causes an unwanted coupling and nonlinear effect on the fresh air charging and combustion (6)(7)(8) , and results in a significant challenge on the control of the combustion.…”

Section: Introductionmentioning

confidence: 99%

Air Path Dynamics Control and Efficiency Optimization with Scenario Approach for Gasoline Engines

Jiang

Shen

2019

IJAE

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This paper presents a control design approach of efficiency optimization while providing the desired torque under the constraint of combustion variation for gasoline engines with EGR. Mainly, the first phase of control design is the equilibrium point optimization under the chance constraint of IMEP probability distribution with a scenario approach, and the second phase is nonlinear dynamic feedback stabilization control design for improving transient performance of the state regulation. The experimental validations demonstrate that the control scheme can achieve stable combustion and fast transient control performance.

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“…Thus, EGR extraction upstream of the catalyst provides higher driving force for EGR flow comparing to extraction downstream of the catalyst. 15 Some studies have also used intake pressure regulation valves installed upstream of the compressor to increase pressure differential; 15,16 however, such valves introduce pumping losses to the system 17 and are avoided in this research. Considering also that the current trend in modern SI engines is to reduce or even eliminate throttling at part-load operation, the addition of another valve in the intake is not the optimal solution.…”

Section: Feed-forward Estimation Challengesmentioning

confidence: 99%

Short-term and long-term adaptation algorithm for low-pressure exhaust gas recirculation estimation in spark-ignition engines

Siokos

Koli

Prucka

2018

International Journal of Engine Research

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Low-pressure exhaust gas recirculation systems are capable of increasing fuel efficiency of spark-ignition engines; however, they introduce control challenges. The low available pressure differential that drives exhaust gas recirculation flow, along with the significant pressure pulsations in the exhaust environment of a turbocharged engine hamper the accuracy of feed-forward estimation models. For that reason, feedback measurements are required in an effort to increase prediction accuracy. Additionally, the accumulation of deposits in the exhaust gas recirculation system and the aging of the valve, change the flow characteristics over time. Under these considerations, an adaptation algorithm is developed which handles both short-term (operating-point-dependent errors) and long-term (system aging) corrections for exhaust gas recirculation flow estimation. The algorithm is based on an extended Kalman filter for joint state and parameter estimation and uses the output of an intake oxygen sensor to adjust the feed-forward prediction by creating an online adaptation map. Two different exhaust gas recirculation estimation models are developed and coupled with the adaptation algorithm. The performance of the algorithm for both estimation models is evaluated in real-time through transient experiments with a turbocharged spark-ignition engine. It is demonstrated that this methodology is capable of creating an adaptation map which captures system aging, while also reduces the estimation bias by more than four times resulting in a prediction error of less than 1%. Finally, this approach proves to be a valuable tool that can significantly reduce offline calibration efforts for such models.

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Low Pressure Cooled EGR for Improved Fuel Economy on a Turbocharged PFI Gasoline Engine

Cited by 20 publications

References 10 publications

Study on pollutants formation under knocking combustion conditions using an optical single cylinder SI research engine

Study on pollutants formation under knocking combustion conditions using an optical single cylinder SI research engine

Air Path Dynamics Control and Efficiency Optimization with Scenario Approach for Gasoline Engines

Short-term and long-term adaptation algorithm for low-pressure exhaust gas recirculation estimation in spark-ignition engines

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