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 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.

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.

scholarly journals Study of the engine configuration effect on the maximum achievable load in CAI using water injection

2020 ◽  
pp. 146808742096085
Author(s):  
J Valero-Marco ◽  
B Lehrheuer ◽  
JJ López ◽  
S Pischinger
Keyword(s):  
Compression Ratio ◽  
Engine Speed ◽  
Gasoline Engine ◽  
Fuel Injection ◽  
Water Injection ◽  
Maximum Load ◽  
Operating Conditions ◽  
Work Related ◽  
Operating Strategies ◽  
Injection Strategies

The approach of this research is to enlarge the knowledge about the methodologies to increase the maximum achievable load degree in the context of gasoline CAI engines. This work is the continuation of a previous work related to the study of the water injection effect on combustion, where this strategy was approached. The operating strategies to introduce the water and the interconnected settings were deeply analyzed in order to optimize combustion and to evaluate its potential to increase the maximum load degree when operating in CAI. During these initial tests, the engine was configured to enhance the mixture autoignition. The compression ratio was high compared to a standard gasoline engine, and suitable fuel injection strategies were selected based on previous studies from the authors to maximize the reactivity of the mixture, and get a stable CAI operation. Once water injection proved to provide encouraging results, the next step dealt in this work, was to go deeper and explore its effects when the engine configuration is more similar to a conventional gasoline engine, trying to get CAI combustion closer to production engines. This means, mainly, lower compression ratios and different fuel injection strategies, which hinders CAI operation. Finally, since all the previous works were performed at constant engine speed, the engine speed was also modified in order to see the applicability of the defined strategies to operate under CAI conditions at other operating conditions. The results obtained show that all these modifications are compatible with CAI operation: the required compression ratio can be reduced, in some cases the injection strategies can be simplified, and the increase of the engine speed leads to better conditions for CAI combustion. Thanks to the analysis of all this data, the different key parameters to manage this combustion mode are identified and shown in the paper.

Variation of Sauter Mean Diameter of Droplets of Gasoline Engine Intake Port during Cold Start

2012 ◽  
Vol 433-440 ◽  
pp. 6390-6396
Author(s):  
Pei Yong Ni ◽  
Xiang Li Wang
Keyword(s):  
Engine Speed ◽  
Gasoline Engine ◽  
Cold Start ◽  
Droplet Velocity ◽  
Injection Timing ◽  
Fuel Temperature ◽  
Sauter Mean Diameter ◽  
Initial Droplet ◽  
Mean Diameter ◽  
Fuel Evaporation

The reduction of sauter mean diameter (SMD) of droplets means the percent of the evaporated fuel, which is important to the formation of the combustible mixture in a port-injection gasoline engine during cold-start. Three-dimensional numerical simulation of SMD of the droplets in the inlet port of a gasoline engine was employed using the CFD software. This paper presented the effect of multi-parameters on SMD of the droplets including initial droplet velocity, intake temperature, fuel temperature, injection timing and engine speed. The simulation results show that the most influential parameters on SMD of the droplets are intake temperature and fuel temperature. The fuel evaporation rates increase approximately linearly with the intake air temperature and fuel temperature increasing. The initial droplet velocity and injection timing have a little effect on the fuel evaporation. As engine speed increases, SMD of the droplets firstly decreases and then increases. After intake-valve-open (IVO), back flow of gas in cylinders results in steep reduction of droplet diameter.

Idle speed performance improvement via torque balancing control in ignition-event scale for SI engines with multi-cylinders

2011 ◽  
Vol 13 (1) ◽  
pp. 65-76 ◽  
Author(s):  
P Li ◽  
T Shen ◽  
D Liu
Keyword(s):  
Feedback Control ◽  
Engine Speed ◽  
Gasoline Engine ◽  
Switching Function ◽  
Event Scale ◽  
Torque Generation ◽  
Speed Performance ◽  
Si Engines ◽  
The Individual ◽  
Balancing Control

Imbalance in torque generation leads to engine speed fluctuation. To improve the idle engine speed performance, the torque balancing control problem is addressed in this paper for multi-cylinder SI engines. To evaluate cylinder-to-cylinder imbalance, the average torque in ignition-event scale is introduced as controlled output, which enables a feedback control to be performed without measurement of instantaneous torque, and the individual spark advances are chosen as control inputs. A linear discrete time model with single input and single output is proposed to represent the dynamics of the imbalance, where a sequentially switching function is introduced to describe the spark advance signals delivered to each cylinder and the differences in torque generation caused by the individual cylinder characteristics are equivalently modelled as unknown offset in the inputs. An estimation algorithm with the proof of convergence is presented to provide on-line estimation of the unknown offset under the passivity assumption of the system. Furthermore, a feedback control law which combines the unknown offset estimation and the model predictive control is proposed. Finally, the unknown offset estimation and the feedback control approach are validated based on the experimental results carried out on a six-cylinder gasoline engine test bench.

Design of a Multiple-Actuation Shape Memory Alloy Pipe Coupler: Material Development and Characterization

2012 ◽  
Author(s):  
Majid Tabesh ◽  
John Rohmer ◽  
James G. Boyd ◽  
Dimitris C. Lagoudas ◽  
Kadri C. Atli ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Contact Pressure ◽  
Niti Alloy ◽  
Internal Surface ◽  
Alloy System ◽  
Longitudinal Direction ◽  
The State ◽  
Pipe System ◽  
Material Development

Shape memory alloy (SMA) pipe couplers use the shape memory effect to apply a contact pressure onto the surface of the pipes to be coupled. In the current research, an SMA pipe coupler is designed, fabricated and tested. The thermally induced contact pressure depends on several factors such as the dimensions and properties of the coupler-pipe system. An in-house developed NiTi alloy system is considered for the coupler. The coupling pressure is measured using strain gages mounted on the internal surface of an elastic steel ring. Thermal actuation response of the coupler is determined under both stressed and stress-free conditions. In addition, the state of anisotropy is investigated in the coupler by characterizing samples in the longitudinal and transverse directions. Unlike the commercially available NiTiNb couplers, the NiTi coupler demonstrates a multiple actuation response and higher contact pressure. The state of anisotropy is investigated in the couplers by characterizing samples in the longitudinal and transverse directions. The results show no change in transformation temperatures with respect to two perpendicular transverse and longitudinal directions, however, the material can undergo higher transformation strains in the longitudinal direction.

scholarly journals Crank Angle Resolved HC-Detection Using LIF in the Exhausts of Small Two-Stroke Engines Running at High Engine Speed

1996 ◽  
Author(s):  
Öivind Andersson ◽  
Greger Juhlin ◽  
Martin Ekenberg ◽  
Bengt Johansson ◽  
Marcus Aldén
Keyword(s):  
Engine Speed ◽  
Crank Angle ◽  
High Engine Speed
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