Piston Friction Force of a Small High Speed Gasoline Engine

1988 ◽  
Vol 110 (1) ◽  
pp. 112-118 ◽  
Author(s):  
M. Takiguchi ◽  
K. Machida ◽  
S. Furuhama
Keyword(s):  
Friction Force ◽  
High Speed ◽  
Engine Speed ◽  
Gasoline Engine ◽  
Measuring Instruments ◽  
Friction Forces ◽  
Engine Speed Range ◽  
Speed Range ◽  
High Engine Speed

This paper clarified piston friction forces and conditions of lubrication in the high engine speed range through the improvement of piston friction measuring instruments. Measurements of piston friction forces of the two-ring package have been also done. It is found that the effect of the two-ring package on the reduction of friction forces is greater than expected by means of the oil starvation phenomenon.

Experimental Study of a Variable Pressure Damper on Automotive Valve Motion

1996 ◽  
Author(s):  
Jin-Jang Liou ◽  
Grodrue Huang ◽  
Wensyang Hsu
Keyword(s):  
Experimental Study ◽  
Friction Coefficient ◽  
Friction Force ◽  
High Speed ◽  
Experimental Results ◽  
Variable Pressure ◽  
Friction Forces ◽  
Valve Spring ◽  
Valve Motion

Abstract A variable pressure damper (VPD) is used here to adjusted the friction force on the valve spring to investigate the relation between the friction force and the valve bouncing phenomenon. The friction force on the valve spring is found experimentally, and the corresponding friction coefficient is also determined. Dynamic valve displacements at different speeds with different friction forces are calibrated. Bouncing and floating of the valve are observed when the camshaft reaches high speed. From the measured valve displacement, the VPD is shown to have significant improvement in reducing valve bouncing distance and eliminating floating. However, experimental results indicate that the valve bouncing can not be eliminated completely when the camshaft speed is at 2985 rpm.

Effects of Design for Piston Pin and Bearing on State of Bearing Lubrication

2007 ◽  
Author(s):  
Hideyuki Iwasaki ◽  
Yuuto Higasa ◽  
Masaaki Takiguchi ◽  
Seiichi Sue ◽  
Keitaro Shishido
Keyword(s):  
Contact Pressure ◽  
Engine Speed ◽  
Gasoline Engine ◽  
The State ◽  
Bearing Contact ◽  
High Engine Speed

We measured the friction of piston pin boss bearings for a gasoline engine to make sure of the state of lubrication. In addition, we checked how the shape of the piston pin as well as that of the pin boss influenced the state of bearing lubrication, which was analyzed according to the FEM calculations of pin and bearing contact pressure. As a result, it was made clear that the state of bearing lubrication sharply deteriorated at an engine speed of 3500 rpm or higher because the deformed pin caused the pin edge to heavily come into contact with the bearing, and a side relief was able to improve the state of lubrication at a high engine speed. We also gave a check to the piston pin for thickness to see how it influenced the state of lubrication, finding that a lighter-weight pin led to the deterioration of lubrication.

scholarly journals An Innovative Constant Voltage Control Method of PMSM-Type ISG Under Wide Engine Speed Range for Scooter With Idling Stop

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 20723-20733 ◽  
Author(s):  
Ming-Shi Huang ◽  
Kuan-Cheng Chen ◽  
Tse-Kai Chen ◽  
Yu-Chiang Liang ◽  
Guan-You Pan
Keyword(s):  
Engine Speed ◽  
Control Method ◽  
Voltage Control ◽  
Constant Voltage ◽  
Engine Speed Range ◽  
Speed Range

Turbocharger Nonlinear Response With Engine-Induced Excitations: Predictions and Test Data

2009 ◽  
Vol 132 (3) ◽  
Author(s):  
Luis San Andrés ◽  
Ash Maruyama ◽  
Kostandin Gjika ◽  
Sherry Xia
Keyword(s):  
Test Data ◽  
High Speed ◽  
Engine Speed ◽  
Behavior Modeling ◽  
Lubricant Films ◽  
Speed Range ◽  
Bearing Design ◽  
Power Outputs ◽  
Main Engine ◽  
Good Agreement

Turbochargers (TCs) aid to produce smaller and more fuel-efficient passenger vehicle engines with power outputs comparable to those of large displacement engines. This paper presents further progress on the nonlinear dynamic behavior modeling of rotor-radial bearing system by including engine-induced (TC casing) excitations. The application is concerned with a semifloating bearing design commonly used in high speed turbochargers. Predictions from the model are validated against test data collected in an engine-mounted TC unit operating at a top speed of 160 krpm (engine speed=3600 rpm). The bearing model includes noncylindrical lubricant films as in a semifloating-ring bearing with an antirotation button. The nonlinear rotor transient response model presently includes input base motions for the measured TC casing accelerations for increasing engine load conditions. Engines induce TC casing accelerations rich in multiple harmonic frequencies; amplitudes being significant at two and four times the main engine speed. Fast Fourier transfor frequency domain postprocessing of predicted nonlinear TC shaft motions reveals a subsynchronous whirl frequency content in good agreement with test data, in particular, for operation at the highest engine speeds. Predicted total shaft motion is also in good agreement with test data for all engine loads and over the operating TC shaft speed range. The comparisons validate the rotor-bearing model and will aid in reducing product development time and expenditures.

Crankshaft Torsional Vibration Characteristics in a Vee-Type Six-Cylinder Diesel Engine

2002 ◽  
Author(s):  
Jouji Kimura ◽  
Shinichirou Kobayashi ◽  
Kazuhiro Shiono
Keyword(s):  
Diesel Engine ◽  
Torsional Vibration ◽  
Engine Speed ◽  
Significant Degree ◽  
Vibration Characteristics ◽  
Resonant Vibration ◽  
Harmonic Order ◽  
Engine Speed Range ◽  
Speed Range

Engines have been designed to avoid low-harmonic-order resonant torsional vibration in a commonly-used engine speed range, but the authors have found that, in some engines, especially turbo-charged engines, a significant degree of a low-harmonic-order exciting torque acts on the crankshaft. In these engines, the amplitude of non-resonant low-harmonic-order torsional vibration is almost as large as that of the resonant one and the amplitude of non-resonant vibration can not be controlled by a damper. Accordingly, to investigate the characteristics of non-resonant low-harmonic-order torsional vibration is important. This paper describes the characteristics of non-resonant and resonant torsional vibration for a vee-type six-cylinder diesel engine.

scholarly journals Experimental Analysis to find the optimum Specific Fuel Consumption for Driver’s Intimation

2019 ◽  
Vol 8 (2) ◽  
pp. 452-456
Keyword(s):  
Fuel Consumption ◽  
High Speed ◽  
Internal Combustion Engines ◽  
Engine Speed ◽  
Light Emitting Diode ◽  
Specific Fuel Consumption ◽  
Fuel Price ◽  
Light Emitting ◽  
Speed Range ◽  
Range Indicator

The crude oil based fuel price is constantly increasing in India, So it is compulsory to utilize the fuel properly by the user. As most of the driver tends to press the gas pedal unnecessarily, the fuel used at that particular condition is excess than the requirement. This experiment focuses on improving the fuel economy by warning the driver to drive their vehicles in optimum Specific Fuel Consumption (SFC) range using electronic SFC Speed Range Indicator. In variable speed Internal Combustion Engines there will be an optimum SFC range for a particular load and Engine Speed. Our system will monitor the Engine speed and load continuously and also compare the values with best SFC speed range graph and depends on these values the three Light Emitting Diode (LED) on Specific Fuel Consumption Speed Range Indicator(SFCSRI) will glow accordingly to mention the driver about the optimum, low or high speed. This helps the driver to drive their vehicles on optimum SFC range

scholarly journals PENGARUH PENINGKATAN TEKANAN TERHADAP UNJUK KERJA ENGINE SATU SILINDER

POROS ◽  
2018 ◽  
Vol 16 (1) ◽  
Author(s):  
Abrar Riza Riza
Keyword(s):  
Engine Speed ◽  
Gasoline Engine ◽  
Ignition Time ◽  
Engine Performance ◽  
Working Pressure ◽  
Work Pressure ◽  
High Engine Speed ◽  
One Step ◽  
Reduce Emissions ◽  
The One

Ignition timing in an important at internal combustion. Timing has a role to synchronize the system in order to get optimal energy. Ignition time is directly related to working pressure in the combustion chamber. The delay combustion will result in higher work pressure. Increased work pressure can increase the performance of the fuel motor and can reduce emissions because combustion is encouraged to be more perfect. Various methods can be done to accompany the conditions of delay combustion to increase work pressure by increasing the octane number. This research focuses on the influence of the one-step gasoline engine performance variable. Effective octane enhancing solutions are used to increase pressure with the concept of combustion delay. Octane-enhancing solutions can be used in various types or concentration in fuel. The results of the study are that torque can increase up to 15% and the power can increase up to 20% compared to standard testing conditions. This is effective at medium to high engine speed.

Turbocharger Nonlinear Response With Engine-Induced Excitations: Predictions and Test Data

2009 ◽  
Author(s):  
Luis San Andre´s ◽  
Ash Maruyama ◽  
Kostandin Gjika ◽  
Sherry Xia
Keyword(s):  
Test Data ◽  
High Speed ◽  
Engine Speed ◽  
Behavior Modeling ◽  
Lubricant Films ◽  
Speed Range ◽  
Bearing Design ◽  
Power Outputs ◽  
Main Engine ◽  
Good Agreement

Turbochargers (TCs) aid to produce smaller and more fuel-efficient passenger vehicle engines with power outputs comparable to those of large displacement engines. This paper presents further progress on the nonlinear dynamic behavior modeling of rotor-radial bearing system (RBS) by including engine-induced (TC casing) excitations. The application concerns to a semi-floating bearing design commonly used in high speed turbochargers. Predictions from the model are validated against test data collected in an engine-mounted TC unit operating to a top speed of 160 krpm (engine speed = 3600 rpm). The bearing model includes non-cylindrical lubricant films as in a semi-floating ring bearing with an anti-rotation button. The nonlinear rotor transient response model presently includes input base motions for the measured TC casing accelerations for increasing engine load conditions. Engines induce TC casing accelerations rich in multiple harmonic frequencies; amplitudes being significant at 2 and 4 times the main engine speed. FFT post-processing of predicted nonlinear TC shaft motions reveals a subsynchronous whirl frequency content in good agreement with test data, in particular for operation at the highest engine speeds. Predicted total shaft motion is also in good agreement with test data for all engine loads and over the operating TC shaft speed range. The comparisons validate the rotor-bearing model and will aid in reducing product development time and expenditures.

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