scholarly journals Comparative automotive engine operation when fueled with ethanol and methanol

1978 ◽  
Author(s):  
E. Ecklund
Keyword(s):  
Engine Operation ◽  
Automotive Engine

scholarly journals Effect of the High Temperature Resistant Nano-Coolant on Automotive Engine Operation

2019 ◽  
Vol 5 (1) ◽  
pp. 1
Author(s):  
Xin Sha ◽  
Lu Ruirui ◽  
He Yan ◽  
Xu Changming ◽  
Luo Yi
Keyword(s):  
High Temperature ◽  
Engine Operation ◽  
Automotive Engine

Preliminary Study of Fuel Injector Monitoring System by I-KazTM Multilevel Analysis

2013 ◽  
Vol 471 ◽  
pp. 229-234
Author(s):  
Zailan Karim ◽  
M.A. Jusoh ◽  
A.R. Bahari ◽  
Mohd Zaki Nuawi ◽  
Jaharah Abd. Ghani ◽  
...  
Keyword(s):  
Monitoring System ◽  
Single Channel ◽  
Injection System ◽  
Fuel Injector ◽  
Monitoring Method ◽  
Engine Operation ◽  
Automotive Engine ◽  
Actual Operation ◽  
Pressure Bar ◽  
The Relationship

Fuel injector in automotive engine is a very important component in injecting the correct amount of fuel into the combustion chamber. The injection system need to be in a very safe and optimum condition during the engine operation. The mulfunction of the injection system can be avoided if the current working condition is known and a proper maintenence procedure is implemented. This paper proposes the development of a fuel injector monitoring method using strain signals captured by a single-channel strain gage attached on the fuel injector body. The fuel injector was operated under three main sets of parameters; pulse width (ms), frequency (Hz) and pressure (bar) which were varried from 5 ms to 15 ms, 17 Hz to 25 Hz and 10 bar to 70 bar respectively. The settings produce 27 different engine operations and the strain signal will be captured at each operation. The captured strain signals will be analyzed using I-kazTM Multilevel technique and will be correlated with the main parameters. The relationship between the I-kazTM Multilevel coefficient and the main parameters indicate good correlations which can be used as the guidance for fuel injector monitoring during actual operation. The I-kaz Multilevel technique was found to be very suitable in this study since it is capable of showing consistence pattern change at every parameter change during the engine operation. This monitoring system has a big potential to be developed and improved for the optimization of fuel injector system performance in the automotive industry.

Improvement of the Dynamic Characteristic of an Automotive Engine by a Turbocharger Assisted by an Electric Motor

2001 ◽  
Author(s):  
Tomaž Katrašnik ◽  
Ferdinand Trenc ◽  
Samuel Rodman ◽  
Aleš Hribernik ◽  
Vladimir Medica
Keyword(s):  
Diesel Engine ◽  
Transient Response ◽  
Electric Motor ◽  
Dynamic Performance ◽  
Poor Performance ◽  
General Characteristic ◽  
Simulation Method ◽  
Engine Operation ◽  
Time Dynamic ◽  
Automotive Engine

Abstract Increase of the mean effective pressure in an automotive Diesel engine is generally the consequence of the turbocharging and subsequent charge cooling of the working medium. A problem of poor performance during the engine speed and load change is attributed to the nature of energy exchange between the engine and the turbocharger. Filling of the intake and exhaust manifolds, consequent increase of the pressure and acceleration of the rotating components of the turbocharger require a certain period of time. Dynamic performance of the turbocharger can be substantially improved by the assistance of an electric motor attached directly to the turbo shaft. A new concept of asynchronous electric motor with a very thin rotor was applied to support the turbocharger during the transient regimes of the engine. Experimental work for matching an electrically assisted turbocharger to an engine is rather expensive; it was therefore decided to determine general characteristic of the electric motor separately by experiments, whereas transient response of the turbocharged and intercooled Diesel engine was simulated by a zero-dimensional filling and emptying computer simulation method. A lot of experimentally obtained data and empirical formulae for the compressor, gas turbine, flow coefficients of the engine valves, intercooler, high pressure fuel pump with the pneumatic control device (LDA), combustion parameters etc. were applied to overcome deficiency introduced by the zero-dimensional simulation model. As the result a reliable and accurate program compatible with the experimental results in steady and transient engine operation was developed and is presented in the work. Faster transient response of the engine was obtained by applying an electric motor to assist the turbocharger; a few versions were introduced in the simulation program and were also analysed in the work.

PERFORMANCE OF A WATER PUMP IN AN AUTOMOTIVE ENGINE COOLING SYSTEM

2016 ◽  
Vol 78 (10-2) ◽  
Author(s):  
Mohamad Lazim Mohamed Tasuni ◽  
Zulkarnain Abdul Latiff ◽  
Henry Nasution ◽  
Mohd Rozi Mohd Perang ◽  
Hishammudin Mohd Jamil ◽  
...  
Keyword(s):  
Cooling System ◽  
Maximum Power ◽  
Coolant Temperature ◽  
Electric Pump ◽  
Water Pump ◽  
Test Rig ◽  
Engine Operation ◽  
Automotive Engine ◽  
Engine Cooling ◽  
Simulator Test

A cooling system employed in an automobile is to maintain the desired coolant temperature thus ensuring for optimum engine operation. Forced convection obtained by means of a water pump will enhance the cooling effect. Thus it is necessary to understand the system’s pump operation and be able to provide for the ultimate cooling of the engine. The objective of this laboratory investigation is to study the water pump characteristics of an engine cooling system. The crucial water pump parameters are the head, power, and its efficiency. In order to investigate the water pump characteristic a dedicated automotive cooling simulator test rig was designed and developed. All of the data obtained are important towards designing for a more efficient water pump such as electric pump that is independent of the power from the engine. In addition to this fact, the simulator test rig can also be used to investigate for any other parameters and products such as radiator performance and electric pump before installation in the actual engine cooling system. From the experiment conducted to simulate for the performance of a cooling system of a Proton Wira (4G15), the maximum power equals to 37 W which indicates the efficiency of the pump is relatively too low as compared to the typical power consume by the pump from the engine which are about 1 to 2 kW. Whereas the maximum power and efficiency obtained from the simulator test rig simulator is equals to 42 W and 15% respectively.

Cylinder-to-cylinder high-pressure exhaust gas recirculation dispersion effect on opacity and NOx emissions in a diesel automotive engine

2020 ◽  
pp. 146808741989540 ◽  
Author(s):  
Vicente Macián ◽  
José Manuel Luján ◽  
Héctor Climent ◽  
Julián Miguel-García ◽  
Stéphane Guilain ◽  
...  
Keyword(s):  
High Pressure ◽  
Fuel Consumption ◽  
Exhaust Gas Recirculation ◽  
Accurate Information ◽  
Exhaust Gas ◽  
Engine Operation ◽  
Automotive Engine ◽  
Brake Mean Effective Pressure ◽  
Recirculation Rate ◽  
Gas Recirculation

The objective of the study is to determine the effect of the high-pressure exhaust gas recirculation dispersion in automotive diesel engines in NO x and smoke emissions in steady engine operation. The investigation quantifies the NO x and smoke emissions as a function of the dispersion of the high-pressure exhaust gas recirculation among cylinders. The experiments are performed on a test bench with a 1.6-L automotive diesel engine. In order to track the high-pressure exhaust gas recirculation dispersion in the intake pipes, a valves system to measure CO2, that is, exhaust gas recirculation rate, was installed pipe to pipe. In addition, a valves device to measure NO x emissions cylinder to cylinder in the exhaust was installed. Moreover, a smoke meter device was installed downstream the turbine, to measure the effect of the high-pressure exhaust gas recirculation dispersion on smoke emissions. Five different engine speeds were studied with different torque levels; thus, the engine map was widely studied, from 1250 to 3000 r/min and between 6 and 20 bar of brake mean effective pressure. The exhaust gas recirculation rate varies between 4% and 25% depending on the operating point. The methodology focused on experimental tools combining traditional measuring devices with a specific valves system, which offers accurate information about species concentration in both the intake and the exhaust manifolds. The study was performed at constant raw NO x emissions to observe the effect of the exhaust gas recirculation dispersion in the opacity and fuel consumption. The study concludes that when the exhaust gas recirculation dispersion is low, the opacity presents reduced values in all operating points. However, above a certain level of exhaust gas recirculation dispersion, the opacity increases dramatically with different slopes depending on the engine running condition. This study allows quantifying the exhaust gas recirculation dispersion threshold. In addition, the exhaust gas recirculation dispersion could contribute to increase the fuel consumption up to 3.5%.

Research on the Optimization of Engine Operation Condition Based on Intelligent Automobile

2013 ◽  
Vol 325-326 ◽  
pp. 233-237
Author(s):  
Fa Sheng Sheng ◽  
Xiang Rong Shi
Keyword(s):  
Network Control ◽  
Sensor Data ◽  
Operation Condition ◽  
Engine Operation ◽  
Driving Experience ◽  
Automotive Engine ◽  
Related Data ◽  
Engine Efficiency ◽  
Multi Sensor Data Fusion ◽  
Fusion Methods

In order to realize efficiency optimization of automobile engine, the multi-sensor data fusion methods based on multi-valued logic is proposed, according to the relevance requirement of automotive engine parameters and the control features of the multi-value T-operator, the multi-value T-network control system is designed, taking human driving experience into consideration. By real-time information collection of the sensors and simulation experiments, the related data is gained, which shows that the system circuit operates normally and the information collected is accurate and reliable. Not only engine efficiency control but also energy saving and emission reduction could be realized. Furthermore safety decision making aid function is provided to improve automotive engine efficiency.

A Comparison of Valving Strategies Appropriate For Multimode Combustion Within a Downsized Boosted Automotive Engine—Part I: High Load Operation Within the Spark Ignition Combustion Regime

2014 ◽  
Vol 136 (10) ◽  
Author(s):  
Prasad S. Shingne ◽  
Matthew S. Gerow ◽  
Vassilis Triantopoulos ◽  
Stanislav V. Bohac ◽  
Jason B. Martz
Keyword(s):  
Spark Ignition ◽  
High Load ◽  
Inlet Temperature ◽  
Variable Valve Timing ◽  
Gas Temperature ◽  
Valve Timing ◽  
Engine Operation ◽  
Automotive Engine ◽  
Variable Valve ◽  
Valve Overlap

As future downsized boosted engines may employ multiple combustion modes, the goal of the current work is the definition of valving strategies appropriate for moderate to high load spark ignition (SI) combustion and at low to moderate loads for spark assisted compression ignition (SACI) combustion for an engine with variable valve timing capability and fixed camshaft profiles. The dilution and unburned gas temperature requirements for SACI combustion can be markedly different from those of SI; therefore it is important to ensure that a given valving strategy is appropriate for operation within both regimes. This paper compares one-dimensional (1D) thermodynamic simulations of rated engine operation with positive valve overlap (PVO) and a baseline negative valve overlap (NVO) camshaft design in a boosted automotive engine with variable valve timing capability. Several peak lifts and valve open durations are investigated to guide the down-selection of camshaft profiles for further evaluation under SACI conditions in a companion paper. While the results of this study are engine specific, rated performance predictions show that the duration of both the intake and exhaust camshafts significantly impacts the ability to achieve high load operation. While it was noted that the flow through the exhaust valves chokes for the majority of the exhaust stroke for peak exhaust lifts less than 8 mm, the aggressive engine rating of 194 kW at 5250 rpm could be achieved with peak intake lifts as low as 4 mm and baseline duration. Therefore, camshafts with peak lifts of 8/4 mm exhaust/intake were down-selected to facilitate multimode combustion operation with high levels of PVO. Analysis of high load operation with the down-selected camshafts indicates that peak unburned gas temperatures remain low enough to mitigate end-gas knock, while other variables such as peak cylinder pressure, turbine inlet temperature, and turbocharger speed are all predicted to be within acceptable limits.

Improvement of the Dynamic Characteristic of an Automotive Engine by a Turbocharger Assisted by an Electric Motor

2003 ◽  
Vol 125 (2) ◽  
pp. 590-595 ◽  
Author(s):  
T. Katrasˇnik ◽  
S. Rodman ◽  
F. Trenc ◽  
A. Hribernik ◽  
V. Medica
Keyword(s):  
Diesel Engine ◽  
Transient Response ◽  
Electric Motor ◽  
Dynamic Performance ◽  
Poor Performance ◽  
Transient Behavior ◽  
Engine Operation ◽  
Time Dynamic ◽  
Automotive Engine ◽  
Mass Moment

Turbocharging and subsequent charge cooling of the working medium usually causes increase of the mean effective pressure in an automotive diesel engine. Poor performance during the engine load increase is attributed to the nature of energy exchange between the engine and the turbocharger. Filling of the intake and exhaust manifolds, as well as consequent increase of the pressure and acceleration of the rotating components of the turbocharger require a certain period of time. Dynamic performance of the turbocharger can be substantially improved by means of an electric motor attached directly to the turbo shaft. A new concept of asynchronous electric motor with a very thin rotor was applied to support the turbocharger during the transient operation of the engine. The experimental work of matching an electrically assisted turbocharger to an engine is rather expensive; it was therefore decided to determine general characteristic of the electric motor separately through experiments, whereas transient response of the turbocharged and intercooled diesel engine was simulated by a zero-dimensional filling and emptying computer simulation method. A lot of experimentally obtained data and empirical formulae for the compressor, gas turbine, flow coefficients of the engine valves, intercooler, high-pressure fuel pump with the pneumatic control device (LDA), combustion parameters, etc., were applied to overcome deficiency introduced by the zero-dimensional simulation model. As the result a reliable and accurate program compatible with the experimental results in steady and transient engine operation was developed and is presented in the work. Faster transient response, i.e., better load acceptance of the engine was obtained by applying an adequate electric motor to assist the turbocharger; three versions of electric motors with different torque to mass moment of inertia ratios and different operating regimes were introduced in the simulation program to investigate their influence on the transient behavior of the engine.

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