Design and Modelling of Single Cylinder 4 Stroke Gasoline Engine Crankshaft

A novel first principle based control oriented model of a gasoline engine is proposed which also carries diagnostic capabilities. Unlike existing control oriented models, the formulated model reflects dynamics of the faultless as well as faulty engine with high fidelity. In the proposed model, the torque production subsystem is obtained by integration of further two subsystems that is model of a single cylinder torque producing mechanism and an analytical gasoline engine cylinder pressure model. Model of a single cylinder torque producing mechanism is derived using constrained equation of motion (EOM) in Lagrangian mechanics. While cylinder pressure is evaluated using a closed form parametric analytical gasoline engine cylinder pressure model. Novel attributes of the proposed model include minimal usage of empirical relations and relatively wider region of model validity. Additionally, the model provides model based description of crankshaft angular speed fluctuations and tension in the rigid bodies. Capacity of the model to describe the system dynamics under fault conditions is elaborated with case study of an intermittent misfire condition. Model attains new capabilities based on the said novel attributes. The model is successfully validated against experimental data.

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Comparison of Promising Sustainable C1-Fuels Methanol, Dimethyl Carbonate, and Methyl Formate in a DISI Single-Cylinder Light Vehicle Gasoline Engine

10.4271/2021-01-1204 ◽

2021 ◽

Author(s):

Sebastian Blochum ◽

Felix Fellner ◽

Markus Mühlthaler ◽

Martin Härtl ◽

Georg Wachtmeister ◽

...

Keyword(s):

Dimethyl Carbonate ◽

Methyl Formate ◽

Gasoline Engine ◽

Single Cylinder ◽

Light Vehicle

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The Shell Molding Process Study for Mass Production of Single-Cylinder Diesel Engine Crankshaft

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.44-47.284 ◽

2010 ◽

Vol 44-47 ◽

pp. 284-288 ◽

Cited By ~ 2

Author(s):

Jiang Liu

Keyword(s):

Diesel Engine ◽

Ductile Iron ◽

Pressure Head ◽

Molding Process ◽

Single Cylinder ◽

Iron Castings ◽

Transmission Part ◽

Sector Plate ◽

Engine Crankshaft ◽

Casting Production

Crankshaft is a key transmission part in single-cylinder diesel engine, but its mass casting production is a problem. Based on the traditional shell molding process of ductile iron castings, this study did lots of techniques optimization for the crankshaft castings of single-cylinder diesel engine. Through increasing the multi-block or a combination of chill iron at sector-plate and upper spindle neck, increasing the pressure head of blind risers and the cross section of sprue, improving the fill compaction of iron pills, and other improvements, produces qualified ductile iron crankshaft castings without or almost without the shrinkage and other casting defects.

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Sound & vibration control for a single-cylinder gasoline engine based on parameter optimization of timing-chain system

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

10.1177/0954407017744426 ◽

2017 ◽

Vol 232 (13) ◽

pp. 1815-1827

Author(s):

Xianjun Hou ◽

Songze Du ◽

Chihua Lu ◽

Zien Liu ◽

Hao Zheng ◽

...

Keyword(s):

Optimization Design ◽

Gasoline Engine ◽

Subjective Evaluation ◽

Dynamic Performance ◽

Transverse Displacement ◽

Single Cylinder ◽

Chain System ◽

Design Scheme ◽

Single Cylinder Engine ◽

Timing System

In order to promote the idling noise quality of a single-cylinder gasoline engine, this paper addresses sound source identification and noise control research. The noise was identified by the application of subjective evaluation, acoustic spectrum and sound intensity analysis. It was found that the noise was caused by the anomalous dynamic performance of the timing system under idling conditions. Furthermore, sound and vibration characteristics of timing system were improved by design methodology research of key components. A multi-body dynamic model was established to characterize dynamic characteristics of the timing system under idling conditions. The key factor of producing noise was that the fluctuation of contact force between the chain and guide and transverse displacement of the chain were much higher than those of the allowable design limit. For the lowest design alternation and manufacturing costs, the work analyzed six timing system improvement schemes obtained by cross combination of tensioner blade line and guide strip radian parameters. After that, the optimal design scheme which could improve dynamic performance parameters of the timing system was derived. The design scheme was conducted with a acoustic test of engine to derive the following results. The noise level of a single-cylinder engine under idling conditions decreased by 3 dB(A). The abnormal noise of the original engine was eliminated under subjective evaluation. The sound quality under other working conditions had no apparent deterioration. Research shows that guide and tensioner blade line optimization design could improve dynamic performance of the timing chain system to eliminate abnormal noise, thereby significantly improving the acoustic characteristic of a single-cylinder engine.

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Effect of Inertia Variation Due to Reciprocating Parts and Connecting Rod on Coupled Free Vibration of Crankshaft

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.2815557 ◽

1997 ◽

Vol 119 (1) ◽

pp. 257-263 ◽

Cited By ~ 7

Author(s):

S. Rajendran ◽

M. V. Narasimhan

Keyword(s):

Free Vibration ◽

Natural Frequencies ◽

Free Vibrations ◽

Connecting Rod ◽

Single Cylinder ◽

Considerable Error ◽

Inertial Coupling ◽

Single Cylinder Engine ◽

Crank Angle ◽

Engine Crankshaft

The inertia due to reciprocating parts and connecting rods, as felt by the crankshaft, varies with the crank angle. The effect of inertia variation on torsional free vibration of crankshafts has been studied extensively. In this paper, the effect on combined torsional and bending free vibrations is examined. Single-cylinder engine crankshaft geometry is considered for the study. The results indicate that the inertial coupling, introduced by the reciprocating parts and connecting rod, significantly influences the free vibration characteristics, particularly when the natural frequencies of the crankskahft are closely spaced. The results suggest that, under such conditions, modeling the crankshaft as a pure torsional system would involve considerable error.

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