Intake Air Path Diagnostics for Internal Combustion Engines

2006 ◽  
Vol 129 (1) ◽  
pp. 32-40 ◽  
Author(s):  
Matthew A. Franchek ◽  
Patrick J. Buehler ◽  
Imad Makki
Keyword(s):  
Steady State ◽  
Internal Combustion Engines ◽  
Air Flow ◽  
Internal Combustion ◽  
Flow Sensor ◽  
Path Model ◽  
Intake Manifold ◽  
Fault Estimation ◽  
Combustion Engines ◽  
Sensor Measurement

Presented is the detection, isolation, and estimation of faults that occur in the intake air path of internal combustion engines during steady state operation. The proposed diagnostic approach is based on a static air path model, which is adapted online such that the model output matches the measured output during steady state conditions. The resulting changes in the model coefficients create a vector whose magnitude and direction are used for fault detection and isolation. Fault estimation is realized by analyzing the residual between the actual sensor measurement and the output of the original (i.e., healthy) model. To identify the structure of the steady state air path model a process called system probing is developed. The proposed diagnostics algorithm is experimentally validated on the intake air path of a Ford 4.6L V-8 engine. The specific faults to be identified include two of the most problematic faults that degrade the performance of transient fueling controllers: bias in the mass air flow sensor and a leak in the intake manifold. The selected model inputs include throttle position and engine speed, and the output is the mass air flow sensor measurement.

Mass Air Flow Sensor Diagnostics for Adaptive Fueling Control of Internal Combustion Engines

2002 ◽  
Author(s):  
Patrick J. Buehler ◽  
Matthew A. Franchek ◽  
Imad Makki
Keyword(s):  
Internal Combustion Engines ◽  
Air Flow ◽  
Internal Combustion ◽  
Intake Manifold ◽  
Combustion Engines ◽  
Sensor Output ◽  
Sensor Faults ◽  
Information Synthesis ◽  
Speed Sensor ◽  
Engine Operating Condition

Presented in this paper is an information synthesis (IS) approach for the mass air flow (MAF) sensor diagnosis on internal combustion engines. An information synthesis solution is attractive for diagnostics since the algorithm automatically calibrates itself, reduces the number of false detections and compresses a large amount of engine health information into the model coefficients. There are three primary parts to information synthesis diagnostics. First, an IS model is used to predict the MAF sensor output based on the engine operating condition. The inputs to this IS model include the throttle position sensor (TPS) and the engine speed sensor information. The second part concerns an online adaptation process that is used to reduce the errors between the IS model output and the actual MAF sensor output. Finally the adapted model coefficients are used to diagnose the sensor as well as identify the source for changes in the sensor characteristics. This proposed solution is experimentally tested and validated on a Ford 4.6 L V-8 fuel injected engine. The specific MAF sensor faults to be identified include sensor bias and a leak in the intake manifold.

Calculation and Optimization of Tribocontacts and Lubrication Systems of Internal Combustion Engines for Various Types of Lubricant

2005 ◽  
Author(s):  
S. Sivrikova ◽  
J. Rojdestvensky ◽  
I. Petrov ◽  
S. Popova
Keyword(s):  
Steady State ◽  
Internal Combustion Engines ◽  
Fuel Efficiency ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Lubrication System ◽  
Optimum Choice ◽  
Transient And Steady State

Quality, reliability and fuel efficiency of internal combustion engines (ICE) substantially depend upon optimum choice of lubrication system and tribocontact design and a lubricant liquid. This paper describes a quasistatic method of analysis of ICE lubrication systems for Newtonian and non-Newtonian oils. The method allows for both transient and steady-state conditions.

Geometry Assessment of Variable Displacement Vane Pumps

2006 ◽  
Vol 129 (4) ◽  
pp. 446-455 ◽  
Author(s):  
Massimo Rundo ◽  
Nicola Nervegna
Keyword(s):  
Steady State ◽  
Internal Combustion Engines ◽  
Dynamic Performance ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Pump Speed ◽  
Variable Displacement ◽  
Internal Forces ◽  
Minimum Displacement ◽  
Discharge Pressure

The paper brings to evidence the effect that geometry of the stator ring of variable displacement radial pumps bears on performance characteristics of these units. The type of motion of the stator ring (linear or rotational), the location of the center of rotation, the porting plate integral with the casing or with the stator ring all have remarkable effects on the pump steady state and dynamic performance. At steady state, an influence exists on the attainable minimum displacement and on the deviation of discharge pressure from the desired setting when displacement is being controlled. In turn, dynamic performance is affected by changes in port plate timing as stator position and displacement undergo transitions. Specific attention is then committed to variable displacement vane pumps for internal combustion engines lubrication where an additional and foremost effect is investigated concerning the issues entailed by internal forces distribution on the stator ring that originate from incomplete chambers filling at high rotational pump speed.

scholarly journals INFLUENCE OF USING ALTERNATIVE TYPES OF FUEL ON CHARACTERISTICS OF WORKING PROCESSES OF INTERNAL COMBUSTION ENGINES

2018 ◽  
pp. 24-32 ◽  
Author(s):  
Sergei Pavlovich Glushkov ◽  
Victor Ivanovich Kochergin ◽  
Vasiliy Victorovich Krasnikov
Keyword(s):  
Combustion Chamber ◽  
Synthesis Gas ◽  
Internal Combustion Engines ◽  
Pressure Rise ◽  
Hydrocarbon Fuel ◽  
Internal Combustion ◽  
Intake Manifold ◽  
Combustion Engines ◽  
Combustion Heat ◽  
Working Processes

In application of alternative types of fuel it is necessary to consider the influence of changing specific heat of fuel combustion and a process of fuel supply on parameters of working processes and external characteristics of internal combustion engines. Besides, it is necessary to consider a possible emergence of backfires in the inlet pipeline and increasing concentration of nitrogen oxides as temperature raises in the combustion chamber. It is offered to consider the influence of changing the kinetics of fuel burning under the change of fuel-air mixture composition on the process of pressure rise in the combustion chamber and, therefore, on the speed and acceleration of the piston, size of an impulse of moving parts, parameters of irregularity of rotating speed and vibration loading of the engine. In terms of using hydrogenous synthesis gas, there has been carried out the analysis of possible influence of its main components on parameters of working process of the engine. The results of theoretical calculation of an increase of combustion heat of working mixture and of pilot testing prove an increase of combustion heat and decrease of total fuel consumption at different levels of feeding synthesis gas to the engine intake manifold. The need to observe a certain proportion of hydrogen supply relative to the main hydrocarbon fuel has been noted. The research results prove that changing characteristics of the fuel used leads to a change of a type of vibration load of the power unit.

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