Diagnostic Evaluation of Exhaust Gas Recirculation (EGR) System on Gasoline Electric Hybrid Vehicle

Dadam, Sumanth Reddy; Jentz, Robert; lenzen, Tyler; Meißner, Herbert

doi:10.4271/2020-01-0902

Cited by 59 publications

(11 citation statements)

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“…Therefore, their optimization results may not represent the energy consumption in real world. A recent development in on-board diagnostics (OBD) suggests that more OBD services and routines may be required for future vehicles [3]. The use of deceleration fuel shutoff in conventional vehicles to diagnose powertrain faults and meet OBD regulatory requirements is replaced by spinning the gen-set in the HEV [3,8].…”

Section: Introductionmentioning

confidence: 99%

“…A recent development in on-board diagnostics (OBD) suggests that more OBD services and routines may be required for future vehicles [3]. The use of deceleration fuel shutoff in conventional vehicles to diagnose powertrain faults and meet OBD regulatory requirements is replaced by spinning the gen-set in the HEV [3,8]. The increasing number of OBD events may lead to an increase in energy consumption for HEVs.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of rule-based energy management strategies for hybrid vehicles using dynamic programming

Zhu¹,

Pritchard²,

Dadam³

et al. 2021

Combustion Engines

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Reducing energy consumption is a key focus for hybrid electric vehicle (HEV) development. The popular vehicle dynamic model used in many energy management optimization studies does not capture the vehicle dynamics that the in-vehicle measurement system does. However, feedback from the measurement system is what the vehicle controller actually uses to manage energy consumption. Therefore, the optimization solely using the model does not represent what the vehicle controller sees in the vehicle. This paper reports the utility factor-weighted energy consumption using a rule-based strategy under a real-world representative drive cycle. In addition, the vehicle test data was used to perform the optimization approach. By comparing results from both rule-based and optimization-based strategies, the areas for further improving rule-based strategy are discussed. Furthermore, recent development of OBD raises a concern about the increase of energy consumption. This paper investigates the energy consumption increase with extensive OBD usage.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization of rule-based energy management strategies for hybrid vehicles using dynamic programming

Zhu¹,

Pritchard²,

Dadam³

et al. 2021

Combustion Engines

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“…Therefore, it is of interest to minimize AIS throttling (and consequently the Δ P across the EGR valve) without sacrificing EGR estimation accuracy. Authors in 10–21,26,27 reviewed the control system strategies to meet Fuel economy with sensor configurations but doesn’t address the high pulsating noise in sensor measurements.…”

Section: Introductionmentioning

confidence: 99%

Effects of differential pressure measurement characteristics on high pressure-EGR estimation error in SI-engines

Dadam

Ali

Zhu

et al. 2021

International Journal of Engine Research

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With proper control, exhaust gas recirculation (EGR) can be used for knock mitigation in SI engines, enabling fuel economy improvements through more optimal combustion phasing and lower fuel-enrichment at high loads. Due to significant pressure pulsations across the EGR valve, estimating the mass flow rates at transient and reversing flows across the valve can be challenging. Many systems utilize the pressure drop across a restriction in a flow path as an indication of mass flow. In automotive applications, the measurement of the pressure drop is accomplished by the use of a delta pressure sensor and the pressure drop mechanism could be a sharp edge orifice or other restrictions such as a valve opening. This technique works well for steady-state flow; however, if pressure fluctuations exist, especially at higher frequencies, this method of measuring mass flow can have large errors. The accuracy of EGR mass flow estimation based on a pressure differential (Δ P) measurement and the steady compressible flow orifice equation is investigated for various Δ P sensor frequencies and sampling rates on Ford 3.5L V6 GTDI and 2.3L I4 GTDI engines. This paper identifies the two major contributors of the error are the long length of the gauge lines and the close location of the downstream tap. The long length of the gauge line results in resonances at low frequency which affects the sensor performance. When the downstream tap is placed too close to the orifice, the accuracy of sensor reading is reduced. The proposed solution suggests keeping the gauge line as short as possible and the downstream tap at least two diameters away from the orifice and using a high-speed sensor. The result from engine testing shows a great improvement in the measurement accuracy by 43%. It is demonstrated that using a slow responding sensor with a low sample rate leads to erroneous mass flow calculation when significant pressure pulsations exist. A minimum of 1 kHz sample rate is needed to increase the accuracy of the EGR estimate within ±1%.

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“…Components of this system are used in many areas of internal combustion engine operation. These include misfire monitoring [1,2], diesel particulate filter monitoring [3][4][5][6], catalyst monitoring [7,8], fuel system monitoring [9,10], and EGR system monitoring [11][12][13]. The common features of these systems are that they supervise the operation of the electronic control systems, and that their operation aims to control engine operation in order to meet ecological requirements.…”

Section: Introductionmentioning

confidence: 99%

Investigations of the Usefulness of Dilatometric Methods in the Diagnostics of Combustion Engines

Idzior

Karpiuk

2021

Energies

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Due to rapidly progressing development in the field of materials used in the automotive industry, research methods enabling the validation of the properties of materials used in specific applications, e.g., engines, are gaining importance. One such method is dilatometry, which belongs to a branch of physics dealing with methods of measuring the thermal expansion of bodies. It includes assessment study of the dependence of body measurements on external conditions. The authors propose that dilatometric methods could be used to diagnose damage and the causes of engine damage that has already occurred. This is a novel approach in diagnostic methods. The aim of the paper was to validate the proposed method for diagnosing of combustion engine components. Two cases of malfunction of this type of device are presented. In the first case, the subject of research is needle-nozzle holder precision pairs used in engines with a power of 150 kW. The main achievement of the research is revealing the occurrence of different thermal expansion values of the materials in the individual nozzle holders, with specific needles in particular causing adverse changes in clearances between these elements. The other case involved tests with respect to engine pistons. The proposed test method allows for a very accurate and relatively quick determination of the degree of damage to their surface. The conducted research confirms the usefulness of dilatometric methods in diagnosing combustion engines—their application makes it possible to determine the causes for the formation of the irregularities. The presented results are promising and enable further development of the methods and their implementation not exclusively with regard to internal combustion engines.

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Diagnostic Evaluation of Exhaust Gas Recirculation (EGR) System on Gasoline Electric Hybrid Vehicle

Cited by 59 publications

References 0 publications

Optimization of rule-based energy management strategies for hybrid vehicles using dynamic programming

Optimization of rule-based energy management strategies for hybrid vehicles using dynamic programming

Effects of differential pressure measurement characteristics on high pressure-EGR estimation error in SI-engines

Investigations of the Usefulness of Dilatometric Methods in the Diagnostics of Combustion Engines

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