Electro-pneumatic variable valve actuation system for camless engine: Part I-development and characterization

Tripathy, Srinibas; Das, Abhimanyu; Sahu, Balram; Srivastava, Dhananjay Kumar

doi:10.1016/j.energy.2019.116740

Cited by 11 publications

(13 citation statements)

References 16 publications

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“…More details about the design, development, and integration of the electro-pneumatic VVA system on the SI engine are addressed in the literature. 26,27 The experimental setup of PFI camless engine and its schematic are shown in Figures 3 and 4, respectively. The technical details of the engine are presented in Table 1.…”

Section: Test Engine Setup With the Vva Systemmentioning

confidence: 99%

“…Thus, the modified engine is a PFI camless engine, where the VVA system controlled the intake valve events independently. More details about the design, development, and integration of the electro‐pneumatic VVA system on the SI engine are addressed in the literature 26,27 . The experimental setup of PFI camless engine and its schematic are shown in Figures 3 and 4, respectively.…”

Section: Test Engine Setup and Proceduresmentioning

confidence: 99%

“…In this study, the novel electro‐pneumatic VVA system, developed by the authors 26 was integrated on a single‐cylinder PFI conventional engine and modified into PFI camless engine. As the conventional cam mechanism has been removed from the camless engine, the intake valve events were controlled by the VVA system irrespective of engine speed and load conditions.…”

Section: Introductionmentioning

confidence: 99%

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Effect of internal exhaust gas recirculation on performance, combustion, and emissions in a PFI camless engine

Tripathy

Srivastava

2022

Env Prog and Sustain Energy

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The internal exhaust gas recirculation (EGR) into the intake manifold has a significant impact on fuel economy and emissions in the spark ignition (SI) engine. In this study, an in-house developed novel electro-pneumatic variable valve actuation (VVA) system was integrated on a PFI conventional engine and modified into PFI camless engine to vary the valve events independently. The potential of the developed VVA system in achieving the internal EGR by varying the intake valve opening (IVO) timings was widely investigated. The IVO timing was varied from 30 CA (crank angle) bITDC (before intake top dead center) to 40 CA aITDC (after intake top dead center). The spark timing was varied from 10 to 30 CA bCTDC (before compression top dead center). A 41% pumping mean effective pressure reduction was achieved with varying the IVO from 40 to À30 CA aITDC. It is due to the internal exhaust gas recirculation into the intake manifold that reduces the differential pressure between the manifold and combustion chamber. The entrapment of exhaust gas in the intake manifold dilutes the fresh charge, which deteriorates the combustion.However, advancing the spark timing from 10 to 30 CA bCTDC at IVO À30 CA aITDC, an 18% gas excahnge efficiency improvement was obtained. The fresh charge dilution forms an inhomogeneous mixture inside the cylinder that results in lower NO x emission. It is concluded that the developed VVA system has the potential to improve part loads efficiency by utilizing the internal EGR in a PFI camless engine.

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Section: Test Engine Setup With the Vva Systemmentioning

confidence: 99%

Section: Test Engine Setup and Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of internal exhaust gas recirculation on performance, combustion, and emissions in a PFI camless engine

Tripathy

Srivastava

2022

Env Prog and Sustain Energy

Self Cite

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“…The developed electro‐pneumatic VVA system can be operated from 1000 to 1875 rpm when integrated on a SI engine. This work has been published in the author's previous work in References 34,35.…”

Section: Introductionmentioning

confidence: 99%

“…The experiments were performed in the PFI and GDI camless engines at low engine speed and load conditions (as pumping loss is dominant) to investigate the effect of un‐throttled operation with EIVCs on performance, combustion, and emissions. The author's previous work, that is, development of an electro‐pneumatic camless system has already been published in Reference 34, hence a brief section about the camless system development is presented in this manuscript.…”

Section: Introductionmentioning

confidence: 99%

A comparative assessment of performance, combustion, and emissions of a gasoline port and direct injection camless engine

Tripathy

Srivastava

2022

Env Prog and Sustain Energy

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The lower part-load efficiency of the spark-ignition (SI) engine is because of the higher pumping loss during the gas exchange process. In this study, the part-load efficiency of a port fuel injection (PFI) and gasoline direct injection (GDI) camless engines were investigated. An in-house developed electro-pneumatic variable valve actuation (VVA) system controls the camless engine's intake valve events. The effect of unthrottled operation with early intake valve closings (EIVC) on performance, combustion, and emissions was analyzed. The IVC timing for GDI camless engine was found to be lower (2 -7 crank angle) than the PFI camless engine for all operating conditions due to the in-cylinder charge cooling. Hence, the pumping mean effective pressure (PMEP) for GDI camless engine was reduced, and brake specific fuel consumption (BSFC) was improved (maximum 2.1%) compared to the PFI camless engine. The THC and CO emissions were higher for GDI camless engine due to the relatively in-homogeneous mixture formation, whereas the NO x emission was lower for all operating conditions.

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Valve Motion Characteristics and Application on Engine Based on a New Variable Valve Actuation System

Zhou

Wei

Xie

et al. 2023

Int.J Automot. Technol.

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Electro-pneumatic variable valve actuation system for camless engine: Part I-development and characterization

Cited by 11 publications

References 16 publications

Effect of internal exhaust gas recirculation on performance, combustion, and emissions in a PFI camless engine

Effect of internal exhaust gas recirculation on performance, combustion, and emissions in a PFI camless engine

A comparative assessment of performance, combustion, and emissions of a gasoline port and direct injection camless engine

Valve Motion Characteristics and Application on Engine Based on a New Variable Valve Actuation System

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