Experimental Research on a Three-Dimensional Journal Orbit of a Crankshaft Bearing for an Internal Combustion Engine

2014 ◽  
Vol 136 (3) ◽  
Author(s):  
Jun Sun ◽  
Xinlong Zhu ◽  
Liang Zhang ◽  
Xianyi Wang ◽  
Xiaohui Chai ◽  
...  
Keyword(s):  
Internal Combustion Engine ◽  
Cross Section ◽  
Engine Speed ◽  
Combustion Engine ◽  
Axial Direction ◽  
Internal Combustion ◽  
Operating Cycle ◽  
Axial Movement ◽  
Crankshaft Journal ◽  
The Cross

The current experimental researches on the orbit of a journal center of a crankshaft bearing for an internal combustion engine were usually focused on the 2D movement locus of a crankshaft journal center in the cross section of the bearing. However, in the actual operation of an internal combustion engine, there exists the movement of a crankshaft journal along the bearing axis under the effect of various factors, such as the crankshaft deformation acted by load. Obviously the tribological performance of a crankshaft bearing is affected inevitably by the movement of the crankshaft journal along the bearing axis. In this paper, a four-stroke four-cylinder internal combustion engine was taken as the studying object, the 3D orbit (that includes the movement in the cross section of the bearing and the movement along the bearing axis) of the journal center of the crankshaft bearing for an internal combustion engine was measured under a number of operating conditions on the test bench of an internal combustion engine. The position of the journal in the crankshaft bearing was obtained by the measurement using eddy current gap sensors and the data post-process. The results show that there exists the movement of the crankshaft journal along the axial direction in the bearing for an internal combustion engine. The actual orbit of the journal center of the crankshaft bearing for an internal combustion engine is a 3D spatial curve. The orbit of the journal center of the crankshaft bearing in one operating cycle of an internal combustion engine is not a closed curve. There is relatively a large movement of the journal along the axial direction of the crankshaft bearing, and the numerical value of the movement is greater than the radial clearance of the bearing. The greater the rotational speed of the internal combustion engine, the larger the amount of axial movement of the journal. The periodic variation exists in the axial movement of the bearing journal in one operating cycle of the internal combustion engine at low engine speed, and the varying periodicity equals the number of engine cylinders. There is no obvious varying rule of the axial movement of the bearing journal in one operating cycle of the internal combustion engine at high engine speed.

Dynamics of a Cross-Slider Mechanism As Used in an Internal Combustion Engine

1992 ◽  
Author(s):  
Steven M. Nesbit
Keyword(s):  
Internal Combustion Engine ◽  
Dynamic Analysis ◽  
Combustion Engine ◽  
Engine Performance ◽  
Internal Combustion ◽  
Kinematics And Dynamics ◽  
Total Force ◽  
Internal Mechanism ◽  
The Cross

Abstract A four cylinder internal combustion engine was developed which utilizes a cross-slider as its internal mechanism. The mechanism consists of two perpendicular sliders, each connected at midpoint to a floating gear which mates to two grounded gears pinned off center. A complete kinematic and dynamic analysis was performed to study mechanism behavior in an engine application. As a result of the analysis, the kinematics and dynamics of the mechanism were defined, the engine performance was simulated, the components of the engine were properly sized, and a total force and torque balance was achieved. This article will present the development of the kinematic and dynamic expressions that describe the cross-slider mechanism as used in an internal combustion engine.

The Measurement of Air Velocity in a Motored Internal Combustion Engine Using a Hot-Wire Anemometer

1970 ◽  
Vol 185 (1) ◽  
pp. 583-591 ◽  
Author(s):  
H. Hassan ◽  
J. C. Dent
Keyword(s):  
Fixed Point ◽  
Internal Combustion Engine ◽  
Constant Temperature ◽  
Compression Ratio ◽  
Engine Speed ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Hot Wire ◽  
Gas Velocity ◽  
Air Velocity

The application of the constant temperature hot-wire anemometer to the measurement of instantaneous gas velocity in the pre-chamber of a motored I.C. engine is shown to be possible. The correction of the anemometer output to allow for the operation of the wire at conditions greatly removed from those of a windtunnel calibration are discussed. The variation of gas velocity at a fixed point in the pre-chamber with variation of engine compression ratio and engine speed was studied.

The effect of engine speed and cylinder-to-cylinder variations on backfire in a hydrogen-fueled internal combustion engine

2019 ◽  
Vol 44 (39) ◽  
pp. 22223-22230 ◽  
Author(s):  
Cheolwoong Park ◽  
Yongrae Kim ◽  
Young Choi ◽  
Jeongwoo Lee ◽  
Byeungjun Lim
Keyword(s):  
Internal Combustion Engine ◽  
Engine Speed ◽  
Combustion Engine ◽  
Internal Combustion

Design of a Model-Reference Adaptive Control for an Internal Combustion Engine

1973 ◽  
Vol 6 (4) ◽  
pp. 167-173 ◽  
Author(s):  
G. E. Harland ◽  
K. F. Gill
Keyword(s):  
Adaptive Control ◽  
Control System ◽  
Internal Combustion Engine ◽  
Engine Speed ◽  
Dynamic Behaviour ◽  
Combustion Engine ◽  
Speed Control ◽  
Internal Combustion ◽  
Model Reference ◽  
Model Reference Adaptive

An internal combustion engine speed control system has been investigated to determine the possibility of using a model-reference adaptive control device to maintain constant dynamic behaviour of engine speed irrespective of engine load and environmental conditions. A conventional type of speed control arrangement has been used in the primary loop and an auxiliary loop has been introduced which biases the engine throttle mechanism by an amount which is proportional to the derivative of engine speed. The constant of proportionality is the parameter which is being changed by the adaptive loop. The results of the engine tests showed good correlation with those obtained in a simulation study and clearly showed that for certain installations the incorporation of a model-reference loop into a conventional speed control system would result in improved engine dynamic behaviour.

The Turbocharger Exhaust Gas Regulator Design and Analysis

2014 ◽  
Vol 644-650 ◽  
pp. 485-488
Author(s):  
Li Jun Qiu ◽  
Su Ying Xu
Keyword(s):  
Internal Combustion Engine ◽  
Gas Flow ◽  
Engine Speed ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Exhaust Gas ◽  
Waste Gas ◽  
Rotating Blade ◽  
Gas Flow Velocity ◽  
The Way

In order to adapt to the needs of internal combustion engine speed variation of the turbocharger. Using waste gas regulator control exhaust gas inlet device. The effect of exhaust gas regulator is for adjusting the gas flow velocity and direction. When the internal combustion engine running at low speed raising the impeller speed. Exhaust gas regulator and axial moving blades rotating blades of two kinds of structure. The axial moving blade structure is changing the way nozzle ring opening work. Rotating blade structure is working on changing the way of blade Angle. Exhaust gas to adjust the turbocharger is a control of internal combustion engine air pressurization value of the speed changes.

The Effects of Backpressure on the Performance of Internal Combustion Engine and Automobile Exhaust Thermoelectric Generator

2022 ◽  
pp. 1-27
Author(s):  
Rui Quan ◽  
Yousheng Yue ◽  
Zikang Huang ◽  
Yufang Chang ◽  
Yadong Deng
Keyword(s):  
Heat Exchanger ◽  
Pressure Drop ◽  
Internal Combustion Engine ◽  
Thermoelectric Generator ◽  
Engine Speed ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Automobile Exhaust ◽  
Automobile Exhaust Thermoelectric Generator ◽  
Co Emission

Abstract The maximum generated power of automobile exhaust thermoelectric generator (AETEG) can be enhanced by applying inserted fins to its heat exchanger, for the temperature difference of thermoelectric modules (TEMs) is increased. However, the heat exchanger will result in undesired backpressure, which may deteriorate the performance of the internal combustion engine (ICE). To evaluate the backpressure on the performance of both the ICE and the AETEG, the model of ICE integrated with AETEG was established with the GT-power software and validated with the AETEG test bench. The heat exchangers with chaos shape and fishbone shape were proposed, their pressure drop with different engine speeds was studied, and their effects on the performance of both the AETEG and the ICE were analyzed. The results showed that compared with the fishbone-shaped structure, the pressure drop of chaos-shaped heat exchanger is larger at the same engine speed, which contributes to the increased maximum power and hot side temperature of the AETEG. Moreover, compared with the ICE without heat exchanger, the brake torque, brake power, volumetric efficiency and pumping mean effective pressure of the ICE assembled with chaos-shape and fishbone-shape heat exchanger reduce, and the corresponding brake specific fuel consumption, CO emission and CO2 emission increase because of the raised backpressure caused by the heat exchanger.

Analysis of the Regularities of Accumulation and Removal of the Exhaust Gases from the Сombustion-engined Vehicles in the Dead-end Chamber-like Mine Workings

2021 ◽  
pp. 41-47
Author(s):  
E.V. Nakaryakov ◽  
◽  
M.A. Semin ◽  
E.L. Grishin ◽  
E.V. Kolesov ◽  
...  
Keyword(s):  
Internal Combustion Engine ◽  
Cross Section ◽  
Mine Working ◽  
Combustion Engine ◽  
Operating Time ◽  
Internal Combustion ◽  
Large Cross Section ◽  
Exhaust Gases ◽  
Dead End ◽  
Mine Workings

The paper presents the results of the mathematical modeling of the conditions for ventilating extended blind dead end stope chamber-like mine workings of large cross-section, which are formed by expanding the preparatory rifled mine working when loading and hauling machines with an internal combustion engine are operating in them. The experience of using CFD-modeling in solving problems of ventilation of such mine workings is analyzed. Numerical dependences of the change in the average concentration of exhaust gases at the workplace of the load-haul-dump machine operator on the operating time of equipment with an internal combustion engine in the stope area of the chamber were obtained. These dependencies allowed to determine the coefficient of efficiency of ventilation of dead-end stope chamber-like mine workings of large cross-section when operating equipment with an internal combustion engine in them. It was found that the ventilation efficiency coefficient can be taken equal to one both in the case of an increase in the concentration, and in the case of its decrease. The conclusion is made about the same regularities in the processes of accumulation and removal of harmful impurities in the dead-end mine working. Using a parameterized model, expressions were obtained for determining maximum operating time of the machine with an internal combustion engine for unloading ore from the stope area without exceeding maximum permissible concentration of the exhaust gases. An expression is also presented for calculating the minimum ventilation time of the chamber after the vehicle leaves and before its re-entry into the chamber. Made conclusions and obtained dependencies will allow to ensure safe working conditions for the miners in the extended dead-end stope chamber-like mine workings of large cross-section.

Piston Ring Load Carrying Capacity: Influence of Cross-Hatching Parameters

2012 ◽  
Author(s):  
H. Bouassida ◽  
N. Biboulet ◽  
P. Sainsot ◽  
A. A. Lubrecht
Keyword(s):  
Film Thickness ◽  
Internal Combustion Engine ◽  
Carrying Capacity ◽  
Piston Ring ◽  
Combustion Engine ◽  
Cylinder Liner ◽  
Internal Combustion ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
The Cross

Energy and environment are of major concern in internal combustion engine component design. The piston ring-cylinder liner (PRCL) contact plays an essential part in design and is highlighted in this study. In fact, the rings ensure the sealing property, reducing the environmental impact by avoiding lubricant contamination (blow-by) and lubricant consumption. Unfortunately, when sealing, the rings generate between 11 to 24% of the friction losses in an internal combustion engine [1], thus reducing the energy efficiency of the engine. The cylinder liner surface features a special micro-geometry, a classical one is the cross-hatching pattern, obtained by honing. This texturing acts as a micro-bearing, oil reservoir and debris trap. Understanding the influence of texture parameters as groove depth and width or angle, will allow tribological improvements of the PRCL contact. The 2D transient Reynolds equation has to be solved for this kind of surface. The statistical method using the Patir and Cheng [2] flow factors is widely used. This approach lumps the different components of the surface (grooves and plateaux) and does not consider the roughness directionality. Methods decoupling both components, like the homogenization method [3] are also used. Another alternative is to use a deterministic model on measured surfaces, but this is a “hugely” expensive approach. Multigrid methods [4] are used to drastically reduce the calculational cost. The aim of the current study is to facilitate the understanding of measured surface calculations. Hence, analytical surfaces are used. They allow a flexible handling of the cross-hatching parameters. The plateaux are perfectly smooth and the grooves are sinusoidally shaped. The top ring is modelled using a parabolic profile. Periodic boundary conditions are used in the orthoradial direction and zero pressure conditions (Dirichlet) in the axial direction. To investigate the effect of different parameters, various imposed film thicknesses are applied and the mean load carrying capacity (LCC) over time is calculated. When representing the LCC corresponding to each parameter compared to the smooth LCC, as a function of the logarithm of the minimum film thickness, the curves are quite linear for small values of the film thickness and then for larger values they converge to 1.

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