Inlet Valve Seat Wear in High bmep Diesel Engines

2011 ◽  
pp. 31-46
Keyword(s):  
Diesel Engines ◽  
Valve Seat ◽  
Inlet Valve

Study of Inlet Valve Seat Protrusion Effect on GTDI Engine Flow Box

2022 ◽  
pp. 1041-1053
Author(s):  
Ming-ming Wang ◽  
Yong-gang Zhang ◽  
Dong Liu ◽  
Gui-qiang Zhang
Keyword(s):  
Valve Seat ◽  
Inlet Valve

Studies on Wear of Inlet Valve and Cylinder Bore in Diesel Engines

2005 ◽  
Author(s):  
Nagaraj Nayak ◽  
A. D. Dani ◽  
P. A. Lakshminarayanan ◽  
M. K. Gajendra Babu
Keyword(s):  
Case Studies ◽  
Diesel Engines ◽  
Wear Behavior ◽  
Empirical Models ◽  
Current Work ◽  
Inlet Valve ◽  
Operational Variables ◽  
Engine System ◽  
Engine Components ◽  
Cylinder Bore

Wear is a characteristic of the engine system and a wide variety of conditions causes wear and damage of engine parts. In the current work, wear of the engine components are classified on the basis of fretting and adhesive phenomenon. In this regard, we formalized the knowledge of wear of inlet valve and liner quantitatively on the basis of operational and design aspects. Since there are many design and operational variables, the most important variables are selected and tuned by adding new features to the empirical models. Therefore, in the present work case studies on critical engine parts like inlet valve and liner are made to improve the wear behavior of the special components.

Solving Inlet Valve Seat Wear Problem in High BMEP Engines

2001 ◽  
Author(s):  
P. A. Lakshminarayanan ◽  
N. Nayak ◽  
Y. Aghav ◽  
A. D. Dani
Keyword(s):  
Valve Seat ◽  
Inlet Valve

УСОВЕРШЕНСТВОВАННАЯ ТЕХНОЛОГИЯ РЕМОНТА ЭЛЕКТРОГИДРАВЛИЧЕСКИХ ФОРСУНОК АВТОТРАКТОРНЫХ ДИЗЕЛЕЙ

2020 ◽  
Vol 4 (141) ◽  
pp. 74-82
Author(s):  
SERGEY TIMOKHIN ◽  
◽  
PAVEL BOGATYREV ◽  
DMITRIY GALIN ◽  
Keyword(s):  
Contact Surface ◽  
Diesel Engines ◽  
Low Cost ◽  
Ball Valve ◽  
Point Of View ◽  
Research Purpose ◽  
Process Time ◽  
Valve Seat ◽  
Economic Point ◽  
Ring Shape

The actual service life of electrohydraulic injectors of automotive diesel engines with a high-pressure battery system of the Common Rail type in operation is significantly lower than the claimed one, and its restoration by repair is relevant from a technical and economic point of view. One of the most wearable elements of electrohydraulic injectors is the contact surface of the ball valve seat. (Research purpose) The research purpose is in developing an improved technology for repairing electro-hydraulic injectors of automotive diesel engines with a vibration-rivet of the contact surface of the ball valve seat. (Materials and methods) The article presents the carried out theoretical substantiation of the process of vibration riveting of the ball valve seat of electrohydraulic injectors and its laboratory and bench studies using serial stands for testing electrohydraulic injectors, checking their elements and restoring the seat geometry by lapping, an electronic digital microscope. (Results and discussion) Authors confirmed the working hypothesis about the possibility of forming the ring contact surface of the ball valve of electrohydraulic injectors reinforced with a vibration riveting by creating certain hydraulic and electrical modes of its operation during the required time. For the model 0445110376 electrohydraulic injectors of the Cummins ISF 2.8 diesel engine, the total area of the hardened surface of the regular ring shape was 0.07 square millimeters, and the depth was about 0.003 millimeters with a process time of 45 minutes. The parameters of the experimental electrohydraulic injectors met the requirements of the test plan, and they are currently successfully undergoing operational tests. (Conclusions) The use of a valve seat vibration rivet will increase the life of repaired injectors at a low cost for its implementation.

Double-Layer Valve Seat Inserts for Passenger Car Diesel Engines

1985 ◽  
Author(s):  
Naoki Motooka ◽  
Nobuhito Kuroishi ◽  
Mamoru Moritani ◽  
Akira Manabe ◽  
Koji Kazuoka ◽  
...  
Keyword(s):  
Double Layer ◽  
Diesel Engines ◽  
Valve Seat ◽  
Passenger Car ◽  
Valve Seat Inserts

Some Aspects of Combustion and Heat Release in Diesel Engines

1977 ◽  
Author(s):  
K.S. Kannan
Keyword(s):  
Diesel Engine ◽  
Diesel Engines ◽  
Digital Computer ◽  
Valve Closure ◽  
Inlet Valve ◽  
First Law Of Thermodynamics ◽  
Valve Opening ◽  
The University ◽  
University Of Manchester ◽  
Heat Released

The author discusses the various stages of combustion in diesel engines from experiments conducted by himself and also by various other research workers in this field. He then outlines the technique used in predicting heat released by the fuel during combustion in a diesel engine - a techniq ue on which he has worked during his Master's course at the University of Manchester Institute of Science and Technology. The technique consists of applying the first Law of Thermodynamics in steps of the period from inlet valve closure to exhaust valve opening. The First Law equation applicable is reformulated so as to be used on the digital computer.

scholarly journals Influence of Sulfur and Additives on Wear of Exhaust Valve Seat of Cylinder Head

Complexity ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Jianping Zhao ◽  
Shunli Zhang ◽  
Zhenhuan Dou ◽  
YuBo Sun ◽  
Jiangkun Wan ◽  
...  
Keyword(s):  
Sulfur Content ◽  
Contact Surface ◽  
High Power ◽  
Diesel Engines ◽  
Carbon Deposition ◽  
Diesel Oil ◽  
Exhaust Valve ◽  
Composition Analysis ◽  
Valve Seat ◽  
Protection Mechanism

In this paper, taking a certain type of high-power diesel engine exhaust valve abnormal wear phenomenon as an example, we conduct research on the exhaust valve surface micromorphology characteristics, contact surface accumulation products, additive transition layer, and combustion test. These passed diesel sulfur content comparative test, diesel additive composition analysis, and high-sulfur-content and low-sulfur-content diesel and diesel oil additive action test. At present, there is no authoritative research on the influence of sulfur content in diesel on valve seat wear of high-power diesel engines, and the protection mechanism of diesel additives on the valve seat is not clear. The sulfur in diesel, like the lead in gasoline, has long been known to resist wear in the valve seats of high-power diesel engines; just as gasoline additives compensate for the loss of lead, diesel oil additives seem to compensate for the loss of sulfur. Tests show that a uniform carbon deposition layer is formed on the contact surface after the diesel is burned, and the carbon deposition layer is more densely and uniformly adsorbed on the contact surface under the action of diesel additives to form an antiwear layer. Tests also show that the sulfur in diesel has no effect on the wear resistance of the valve seat.

scholarly journals THEORETICAL AND EXPERIMENTAL SUBSTANTIATION OF A METHOD FOR INCREASING THE EFFICIENCY OF REPAIR OF ELECTRIC HYDRAULIC NOZZLES OF AUTOMOTIVE DIESEL ENGINES

2021 ◽  
pp. 93-99
Author(s):  
С.В. Тимохин ◽  
П.В. Богатырев ◽  
А.В. Поликанов ◽  
В.А. Мачнев
Keyword(s):  
Contact Surface ◽  
Diesel Engines ◽  
Point Of View ◽  
Valve Seat ◽  
Economic Point ◽  
Alternative Technologies ◽  
Theoretical Substantiation ◽  
Low Costs ◽  
Experimental Substantiation ◽  
Tractor Diesel

В работе рассмотрены вопросы ремонта электрогидравлических форсунок (ЭГФ), широко распространенных в автотракторных и комбайновых дизелях. Фактический ресурс ЭГФ в эксплуатации значительно ниже заявляемого и его восстановление путем проведения ремонтно – обслуживающих воздействий является целесообразным, как с технической, так и с экономической точек зрения. Проведенный анализ характерных неисправностей ЭГФ показывает, что одним из наиболее изнашиваемых элементов ЭГФ является контактная поверхность седла шарикового электромагнитного клапана. Рассмотрены типовые и альтернативные технологи ремонта седла клапана и предложен способ их улучшения вибронаклепом контактной поверхности. Сформулированы цель и задачи исследований. Проведены теоретическое обоснование процесса вибронаклепа седла шарикового клапана ЭГФ и его лабораторные и стендовые исследования, результаты которых подтвердили рабочую гипотезу о возможности формирования упрочненной вибронаклепом контактной поверхности клапана. Применение предлагаемого способа позволит увеличить ресурс отремонтированных форсунок, при небольших затратах на его реализацию. The article deals with the issues of repair of electro-hydraulic nozzles (EHN), which are widespread in automotive and tractor diesel engines. The actual resource of the EHN is significantly lower than the declared one and its restoration by carrying out repair and maintenance operations is expedient, both from a technical and economic point of view. The analysis of typical EHN malfunctions shows that one of the most wear-out elements of EHN is the contact surface of the seat of a ball electromagnetic valve. Typical and alternative technologies for repairing a valve seat are considered and a method for improving them with a vibration hardening of the contact surface is proposed. The goal and objectives of research are formulated. The theoretical substantiation of the process of vibration hardening of the EHN ball valve seat and its laboratory and bench studies, the results of which confirmed the working hypothesis about the possibility of forming a vibration rivet hardened contact surface of the valve, were carried out. The application of the proposed method will increase the resource of the repaired injectors at low costs for its implementation.

Application of HSMM on the State Recognition for Diesel Engines

2013 ◽  
Vol 380-384 ◽  
pp. 3698-3701
Author(s):  
Qiang Huang ◽  
Wang Cheng ◽  
Shi Feng Ding
Keyword(s):  
Diesel Engines ◽  
Vibration Signal ◽  
Recognition Method ◽  
Inlet Valve ◽  
State Recognition ◽  
Character Extraction ◽  
Training Samples ◽  
On Line ◽  
Emission Behavior ◽  
Diagnosis Technique

It is significant to identify the running-states of diesel engines for ensuring its running stability, fuel economy and emission behavior. Vibration diagnosis is an on-line prognostics and diagnosis technique by picking-up the frequency characters of the vibration signal on the diesel engine. In the paper, combining with the wavelet noise reduction and character extraction with varying scales, the Hidden Semi-Markov model (HSMM) is built by the example of the inlet valve abrasion to recognize the running-states effectively. According to experiment and simulation researches, it indicates that the identification veracity is 96.9% in the 160 test samples after training the HSMM with 120 training samples. This state recognition method is satisfied for the engineering demand, and it can be applied to vibration analysis for other complex machineries.

Control for the Lift of the Inlet Valve - Electromagnetic Drive Assembly with the Effect of Friction

2013 ◽  
Vol 389 ◽  
pp. 596-601
Author(s):  
Adam Rylski ◽  
Krzysztof Siczek
Keyword(s):  
Control Algorithm ◽  
Tial Alloy ◽  
Valve Lift ◽  
Valve Seat ◽  
Inlet Valve ◽  
Electromagnetic Valve ◽  
Electromagnetic Drive ◽  
Fem Method ◽  
Valve Stem ◽  
Valve Assembly

It has been analyzed the assembly of electromagnetic drive - inlet valve operating in camless valvetrain. The valve made of TiAl alloy has mated with its guide made of phosphor bronze. The scheme of electromagnetic valve drive has been shown in the article. The head aim of the motion control for such valve has been to provide small values of the valve velocity near the valve seat position. The aim of present analysis is to study the course of friction force between valve stem and its guide against time during use of control algorithm presented in the article. Curses of generated electrodynamical force against displacement of coil - valve assembly has been computed using FEM method and presented in the article. The courses of valve lift against time for different conditions have been presented in the article.

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