Overview
ABSTRACT
A detailed analysis of the inline 3-cylinder engine acyclism is provided in this paper. The forces, torques and moments related to the gas pressure and inertia are explained, and formulae which are easily usable by the reader are also provided. The time (or angular) and harmonic analysis of the instantaneous torque of the in-line 3-cylinder engine are presented. A systematic comparison of the acyclism behaviour of in-line 3-cylinder and 4-cylinder engines is carried out, as well as a comparison between petrol and diesel engines. Finally, two studies usefull for all types of engines are proposed (dynamic modelling of the connecting rod and inertia of the rotating parts of the engine).
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Read the articleAUTHORS
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Elian BARON: Engineer-Doctor - Powertrain Expert - Renault Automobiles, Guyancourt, France
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Jean-Louis LIGIER: Engineer-Doctor - Professor of Mechanics - HEIG-VD, Yverdon, Switzerland
INTRODUCTION
Engine acyclism is one of the phenomena that engine manufacturers keep under control, since noise and vibration are nowadays just as important as performance and fuel consumption. The notion of acyclism is defined in a previous article
In this article devoted to the acyclism of the 3-cylinder engine, we remain faithful to our systematic approach, detailing each notion precisely and progressively. Numerical examples are also systematically provided, most often graphically, as acyclism is practically "visualizable" enough.
We can't discuss the acyclism of the 3-cylinder engine without comparing it to its 4-cylinder "big brother" (gasoline and diesel). The main quantities relating to these two types of engine are recalled and put into perspective in the form of tables, the most effective way of synthesizing the whole in the form of a simple, usable tool.
Finally, we explain the dynamic behavior of the connecting rod (a valid approach whatever the type of combustion engine considered: 3-cylinder, 4-cylinder, gasoline or diesel) and provide the reader with orders of magnitude for the main rotary inertias of the components making up the mobile coupling (flywheel, clutch mechanism, crankshaft, timing drive pulley, connecting rod, piston).
At the end of the article, readers will find a glossary and a table of notations and symbols...
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KEYWORDS
modelling | crankshaft | instantaneous angular speed variations | dynamic analysis of engine | 3-cyminder engine
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Bibliography
Standards and norms
- Reciprocating internal combustion engines – Designation of the direction of rotation and of cylinders and valves in cylinder heads, and definition of right- and left-hand in-line engines and locations on an engine. - NF ISO 1204 - 1999
- Reciprocating internal combustion engines – Performance – Part 3: test measurements. - NF ISO 3046-3 - 2006
- Reciprocating internal combustion engines – Performance – Part...
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Dynamic analysis and acyclism
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