The Variable-Displacement Engine: An Advanced Concept Powerplant

Welsh, Harvey W.; Riley, Charles T.

doi:10.4271/710830

Cited by 9 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Compression ratios [8][9][10][11][12][13][14][15][16] ducts and junctions, where geometry such as length, orientation, and cross sections are specified. Heat transfer and friction data must also be entered, in this model the selected values are similar to the standard SI engine.…”

Section: Octane Number 98mentioning

confidence: 99%

“…Also there is a several patents about mechanisms which provides variable stroke, one of them are patented by Freudenstein and Maki [13]. Several authors [14][15][16] have proposed different complex mechanisms to achieve variable displacement engine. In the paper of Yamin and Dado [17] was investigated the effect of a variable stroke mechanism on the engine performance, the conclusion showed that the engine performance was improved with this novel design.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Efficiency of a new internal combustion engine concept with variable piston motion

Dorić

Klinar

2014

THERM SCI

View full text Add to dashboard Cite

This paper presents simulation of working process in a new internal combustion engine concept. The main feature of this new internal combustion engine concept is the realization of variable movement of the piston. With this unconventional piston movement it is easy to provide variable compression ratio, variable displacement and combustion during constant volume. These advantages over standard piston mechanism are achieved through synthesis of the two pairs of non-circular gears. Presented mechanism is designed to obtain a specific motion law which provides better fuel consumption of internal combustion engines. For this paper Ricardo/WAVE software was used, which provides a fully integrated treatment of time-dependent fluid dynamics and thermodynamics by means of 1-D formulation.The results obtained herein include the efficiency characteristic of this new heat engine concept. The results show that combustion during constant volume, variable compression ratio and variable displacement have significant impact on improvement of fuel consumption.

show abstract

Section: Octane Number 98mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Efficiency of a new internal combustion engine concept with variable piston motion

Dorić

Klinar

2014

THERM SCI

View full text Add to dashboard Cite

show abstract

“…has not yet been demonstrated on a production engine. Several authors [1,2,3] have proposed different mechanisms to achieve variable in-cylinder displacement. Pouliot et al [4], proposed, constructed and studied a 5-cylinder, four-bar linkage engine.…”

Section: Concept Of Variable Displacement Has Been Addressed In Many mentioning

confidence: 99%

Simulation Study of Advanced Variable Displacement Engine Coupled to Power-Split Hydraulic Hybrid Powertrain

Tavares

Johri

Filipi

2009

ASME 2009 Internal Combustion Engine Division Spring Technical Conference

View full text Add to dashboard Cite

The simulation-based investigation of the variable displacement engine is motivated by a desire to enable unthrottled operation at part load, and hence eliminate pumping losses. The mechanism modeled in this work is derived from a Hefley engine concept. Other salient features of the proposed engine are turbocharging and cylinder deactivation. The cylinder deactivation combined with variable displacement further expands the range of unthrottled operation, while turbocharging increases the power density of the engine and allows downsizing without the loss of performance. While the proposed variable displacement turbocharged engine (VDTCE) concept enables operations in a very wide range, running near idle is impractical. Therefore, the VDTCE is integrated with a hybrid powertrain allowing flexibility in operating the engine, elimination of idling and mitigation of possible issues with engine transients and mode transitions. The engine model is developed in AMESim using physical principles and 1-D gas dynamics. A predictive model of the power-split hydraulic hybrid driveline is created in SIMULINK, thus facilitating integration with the engine. The integrated simulation tool is utilized to address design and control issues, before determining the fuel economy potential of the powertrain comprising a VDTCE engine and a hydraulic hybrid driveline.

show abstract

“…9 Regarding mechanical losses, future experimental investigation is required to indicate whether variable mechanisms increase or decrease friction. The sliding contact between the piston skirt and cylinder is the major source of friction, with the shortened stroke in partial loads leading to lower friction; 14 however, the additional bearings can overwhelm the gains of the shortened stroke. 9 In particular, the mechanism presented herein comprises of a piston linked to a lever, with its rod performing pure reciprocating motion and transmitting force directly to the lever, while sliding in a fixed rod.…”

Section: Introductionmentioning

confidence: 99%

Study on the efficiency of a spark-ignition variable displacement and compression ratio engine

Rufino

Ferreira

2020

International Journal of Engine Research

View full text Add to dashboard Cite

A variable stroke engine was proposed as a promising solution for improving the efficiency of flex-fuel engines by adjusting the compression ratio; this prevents knock onset for fuels with different octane numbers. Similarly, the displacement was adjusted by varying stroke length with the objective of mitigating cylinder pumping losses. This article compares the efficiency of a spark-ignition, port-fuel injection engine, with variable displacements and compression ratios; a conventional engine with a fixed compression ratio; and an engine with variable compression ratios. A simulation-based calibration was performed for each engine, using the results from a phenomenological model to predict the engine performance. The calibration maps were obtained by maximising efficiency through determining the optimal combination of available engine parameters such as spark timing, compression ratio, displacement, and throttle actuation. A comparison of the efficiencies of the different types of engines showed an improvement of approximately 15% for the engine under partial load conditions and with variable displacement and compression ratio, compared to a conventional engine.

show abstract

The Variable-Displacement Engine: An Advanced Concept Powerplant

Cited by 9 publications

References 0 publications

Efficiency of a new internal combustion engine concept with variable piston motion

Efficiency of a new internal combustion engine concept with variable piston motion

Simulation Study of Advanced Variable Displacement Engine Coupled to Power-Split Hydraulic Hybrid Powertrain

Study on the efficiency of a spark-ignition variable displacement and compression ratio engine

Contact Info

Product

Resources

About