Study on the Effects of Compressed Natural Gas on Engine Performances

2014 ◽  
Vol 1030-1032 ◽  
pp. 1242-1246
Author(s):  
Qi Zeng ◽  
Long Hu Fu
Keyword(s):  
Natural Gas ◽  
Bench Test ◽  
Power Performance ◽  
Maximum Torque ◽  
Compressed Natural Gas ◽  
Rotating Speed ◽  
Medium Speed ◽  
Small Load ◽  
Cng Engine ◽  
Gas Consumption

Engine bench test research has been done on a JL4JB1 diesel engine fueled with compressed natural gas (CNG), and the power performance, load performance and universal performance were obtained, analyzing the performance changing regulations of CNG engine. The results indicate that the maximum torque turns up at the medium speed when the engine operates at power performance points, and the minimum brake specific gas consumption (BSGC) also comes up at medium speed. When the rotating speed keeps constant, BSGC decreases with the torque increasing, and decreasing largely at small load while a little at high load. From the universal performance curve of CNG engine, we can know that the minimum BSGC is 194g/kW·h.

The Performance Analysis of LPG as the Vehicle Fuel

2012 ◽  
Vol 217-219 ◽  
pp. 749-753 ◽  
Author(s):  
Xian Long Ding ◽  
Jing Ping Si ◽  
Guo Sheng Wang
Keyword(s):  
Natural Gas ◽  
Alternative Fuels ◽  
Gasoline Engine ◽  
Bench Test ◽  
Liquefied Petroleum Gas ◽  
Power Performance ◽  
Compressed Natural Gas ◽  
Gasoline Engines ◽  
Oil Resources ◽  
Gas Fuel

As the global shortage of oil resources and the rapid increase in car ownership, using gas as the alternative fuel is getting more and more important. Gas fuel, such as CNG (compressed natural gas)/LNG (liquefied natural gas) and LPG (liquefied petroleum gas), with resource-rich, less pollution and other features, are desirable alternative fuels for cars. Through engine bench test, a comparative analysis of power performance between LPG-single fuel engine and gasoline engine was done. The result shows that, by applying LPG injection on single-fuel engine, the power of the LPG engine increases to a higher level than gasoline engines. And combined with the analysis based on the study of domestic development of NGV, predictions could be made that new fuel vehicles will be well utilized in future.

Predicting the Performance and Emissions Characteristics of a Medium Duty Engine Retrofitted with Compressed Natural Gas System Using 1-Dimensional Software

2014 ◽  
Vol 699 ◽  
pp. 702-707
Author(s):  
Ahmad Jais Alimin ◽  
Muhammad Yusri Ismail ◽  
Shahrul Azmir Osman
Keyword(s):  
Natural Gas ◽  
Alternative Fuel ◽  
Simulation Software ◽  
Compressed Natural Gas ◽  
Operational Conditions ◽  
Performance And Emissions ◽  
Power Models ◽  
Cng Engine ◽  
Experimental Process ◽  
Dimensional Simulation

The rise of crude oil price and the implications of exhaust emissions to the environment from combustion application call for a new reliable alternative fuel. A potential alternative fuel for compression ignition (C.I.) engine is the compressed natural gas (CNG). For C.I. engines to operate using CNG, or to be converted as a retrofitted CNG engine, further modifications are required. Previous works reported loss in brake power (BP) and increase in hydrocarbon (HC) emission for C.I. engine retrofitted with CNG fuelling. Verification of performance characteristics for CNG retrofitted engine through experimental analysis requires high cost and is very time consuming. Thus, a 1-Dimensional simulation software, GT-Power, was introduced in this study to reduce the experimental process and setup. A 4-cylinder medium duty C.I. engine (DE) and CNG retrofitted engine (RE) GT-Power models were used in this simulation work over various operational conditions: low, medium and high load conditions. As compared with DE model, results from RE model showed that RE model achieved an average 4.9% improvement for brake specific fuel consumption (BSFC) and loss in BP by 37.3%. For nitrogen oxides (NOX) and carbon dioxides (CO2) RE model predicted reduction of 48.1% (engine mode 1-9) and 33.4% (all engine modes), respectively. Moreover, RE produced 72.4% more carbon monoxide (CO) and 90.3% more HC emission.

Optimal Torque Distribution Strategy of Hybrid Electric Bus Based on Genetic Algorithms

2014 ◽  
Vol 494-495 ◽  
pp. 219-222 ◽  
Author(s):  
Cui Liu ◽  
Xiu Hua Gao ◽  
Jian Hua Guo
Keyword(s):  
High Efficiency ◽  
Compressed Natural Gas ◽  
Threshold Control ◽  
Hybrid Electric Bus ◽  
Electric Bus ◽  
Cng Engine ◽  
Gas Consumption ◽  
Overall Efficiency ◽  
Hybrid Electric ◽  
Logic Threshold

In this paper, the Hybrid Electric Bus (HEB) equipped with Compressed Natural Gas (CNG) engine is taken as the research object on the basis of logic threshold control strategy and the Genetic Algorithm (GA) is adopted to optimize the HEB control thresholds at a typical operating condition of a Chinese city bus. The simulation results show that the overall efficiency of GA optimize is higher than the original control thresholds, the engine operating point moves to the high efficiency region which can be considered optimal threshold by GA makes the overall efficiency has been effectively improved, so as to achieve without lowering the vehicle dynamics and SOC balance of the premise, the gas consumption decreased and increased HEV economy.

scholarly journals Stochastic Air-Fuel Ratio Control of Compressed Natural Gas Engines Using State Observer

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Jun Yang ◽  
Jian Wang ◽  
Xuesheng Zhou ◽  
Yanxiao Li
Keyword(s):  
Natural Gas ◽  
State Observer ◽  
Disturbance Attenuation ◽  
Accuracy Control ◽  
Compressed Natural Gas ◽  
Natural Gas Engines ◽  
Fuel Ratio ◽  
Cng Engine ◽  
Residual Gas ◽  
Engine Dynamic

In this paper, the air-fuel ratio regulation problem of compressed natural gas (CNG) engines considering stochastic L2 disturbance attenuation is researched. A state observer is designed to overcome the unmeasurability of the total air mass and total fuel mass in the cylinder, since the residual air and residual fuel that are included in the residual gas are unmeasured and the residual gas reflects stochasticity. With the proposed state observer, a stochastic robust air-fuel ratio regulator is proposed by using a CNG engine dynamic model to attenuate the uncertain cyclic fluctuation of the fresh air, and the augmented closed-loop system is mean-square stable. A validation of the proposed stochastic robust air-fuel ratio regulator is carried out by the numerical simulation of two working conditions. The accuracy control of the air-fuel ratio is realized by the proposed stochastic robust air-fuel ratio regulator, which in turn leads to an improvement in fuel economy and emission performance of the CNG engines.

The Technical Modification and Performance Analysis of Diesel/LNG Dual Fuel Engines

2013 ◽  
Vol 724-725 ◽  
pp. 1383-1388 ◽  
Author(s):  
Chao Meng ◽  
Jing Ping Si ◽  
Ge Xi Liang ◽  
Jia Hua Niu
Keyword(s):  
Natural Gas ◽  
Fuel Economy ◽  
Alternative Fuels ◽  
Low Cost ◽  
Bench Test ◽  
Dual Fuel ◽  
Power Performance ◽  
Dual Fuel Engines ◽  
Gas Fuel ◽  
And Performance

As the global shortage of oil resource and the rapid increase in car ownership, using gas as the alternative fuel is getting more and more important. Gas fuel, such as LNG (liquefied natural gas), with resource-rich, less pollution and other features, is desirable alternative fuels for cars. In this article, through the engine bench test, a comparative analysis of power performance, fuel economy, emission between diesel/LNG dual engine and diesel engine was done. The result shows that, compared to the original machine , power performance of modified diesel / LNG dual fuel engine decline but isnt obvious. At the same time , fuel economy has a substantial increase. The use of natural gas can relieve shortage of global oil resource and the supply-demand imbalance of oil products. The emission of modified diesel / LNG dual fuel engine has a better state than that of original machines. This kind of modified dual fuel engine is simple, low cost, easily promoted and will be well utilized in future.

scholarly journals Effect of ignition timing on engine characteristics of a single cylinder spark ignition engine with CNG fueled

2017 ◽  
Vol 20 (K6) ◽  
pp. 79-86
Author(s):  
Quoc Dang Tran
Keyword(s):  
Natural Gas ◽  
Thermal Efficiency ◽  
Engine Speed ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Ignition Timing ◽  
Compressed Natural Gas ◽  
Brake Thermal Efficiency ◽  
Timing System ◽  
Cng Engine

This article shows an investigated research on Compressed Natural Gas (CNG) engine with a port injection when varying ignition timing. The obtained results from simulating study have indicated that both of brake thermal efficiency and torque have a similar trend when varying ignition timing. The effect of ignition timing on the value of brake thermal efficiency is stronger in comparison with torque, however, the increase in engine speed or lambda value have to adjust the ignition timing more early. To reach the maximum break torque at each engine speed, the ignition timing should be adjusted IT = 14 - 32 bTDC, and this is also basic value to design the ignition timing system using CNG engine with port injection.

scholarly journals Lean-burn CNG engine with ignition chamber: from the idea to a running engine

2019 ◽  
Vol 176 (1) ◽  
pp. 3-9 ◽  
Author(s):  
Michael WEIßNER ◽  
Frank BEGER ◽  
Martin SCHÜTTENHELM ◽  
Gunesh TALLU
Keyword(s):  
Natural Gas ◽  
Internal Combustion Engines ◽  
State Of The Art ◽  
Combustion Engines ◽  
Lean Burn ◽  
Compressed Natural Gas ◽  
Emission Regulations ◽  
Cng Engine ◽  
Funded Project ◽  
The Eu

Current and further developing CO2- and emission regulations worldwide and the competition to full electric mobility deliver a chal-lenge for internal combustion engines in general. A state of the art solution is the use of natural gas mainly contending methane to reduce CO2 significantly and to offer lowest emission levels. The EU-funded project GasOn developed engine concepts to fully exploit the advantages of CNG. This article describes the development of an innovative, monovalent engine dedicated to Compressed Natural Gas (CNG) and characterised by the lean burn concept and the innovative pre-chamber combustion.

A Real-Time Model of Crush Natural Gas Turbo Engine

2011 ◽  
Vol 58-60 ◽  
pp. 2511-2516
Author(s):  
Rong Di Yuan ◽  
Quan Quan Du
Keyword(s):  
Natural Gas ◽  
Real Time ◽  
Mean Value ◽  
Bench Test ◽  
Time Model ◽  
Electronic Throttle ◽  
Engine Model ◽  
Mean Value Model ◽  
Cng Engine ◽  
Turbo Engine

A new approach is presented in this paper in which a Crush Natural Gas (CNG) Turbo Engine model based on Mean Value Model and transient dynamics are included. The model could simulate engine speed, torque, dynamic load, electronic throttle, turbo, temperature and emission conditions. The model was downloaded and run in a HIL platform joint with Labview and a CNG engine ECU. Simulation results indicate that it acquires good balance between Real-time response and dynamic accuracy, besides good comprehensive running status parameters including dynamic, mechanic, thermo and combustion. The model made it possible for electronic engineers to begin their works earlier to find solutions for power loss, high working temperature of CNG engine with more flexibility and lower bench test expense.

Study on the Modification and Performance of Compressed Natural Gas Engine

2014 ◽  
Vol 568-570 ◽  
pp. 1690-1693
Author(s):  
Qi Zeng
Keyword(s):  
Natural Gas ◽  
Processing System ◽  
Bench Test ◽  
Combustion System ◽  
Compressed Natural Gas ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
And Performance ◽  
Nature Gas ◽  
System Combustion

To modify a diesel engine into a natural gas engine, the supplying system, intake system, ignition system, combustion system and post-processing system are redesigned to meet the requirements of applying natural gas on the engine. Then on the basis of calibration of basic ignition advance angle and volumetric efficiency of natural gas engine, bench test is done to study the velocity performance, load performance and universal performance, as well as a comprehensively evaluation on the performance of natural gas engine. The result indicates that the modifying of nature gas engine is reasonable as it achieves the application of CNG on the engine and a comprehensive performance of engine.

Predicting the Performance and Emissions Characteristics of a Medium Duty Engine Retrofitted with Compressed Natural Gas System Using 1-Dimensional Software

2014 ◽  
Vol 660 ◽  
pp. 468-473 ◽  
Author(s):  
Ahmad Jais Alimin ◽  
Muhammad Yusri Ismail ◽  
Shahrul Azmir Osman
Keyword(s):  
Natural Gas ◽  
Alternative Fuel ◽  
Simulation Software ◽  
Compressed Natural Gas ◽  
Operational Conditions ◽  
Performance And Emissions ◽  
Power Models ◽  
Cng Engine ◽  
Experimental Process ◽  
Dimensional Simulation

The rise of crude oil price and the implications of exhaust emissions to the environment from combustion application call for a new reliable alternative fuel. A potential alternative fuel for compression ignition (C.I.) engine is the compressed natural gas (CNG). For C.I. engines to operate using CNG, or to be converted as a retrofitted CNG engine, further modifications are required. Previous works reported loss in brake power (BP) and increase in hydrocarbon (HC) emission for C.I. engine retrofitted with CNG fuelling. Verification of performance characteristics for CNG retrofitted engine through experimental analysis requires high cost and is very time consuming. Thus, a 1-Dimensional simulation software, GT-Power, was introduced in this study to reduce the experimental process and setup. A 4-cylinder medium duty C.I. engine (DE) and CNG retrofitted engine (RE) GT-Power models were used in this simulation work over various operational conditions: low, medium and high load conditions. As compared with DE model, results from RE model showed that RE model achieved an average 4.9% improvement for brake specific fuel consumption (BSFC) and loss in BP by 37.3%. For nitrogen oxides (NOX) and carbon dioxides (CO2) RE model predicted reduction of 48.1% (engine mode 1-9) and 33.4% (all engine modes), respectively. Moreover, RE produced 72.4% more carbon monoxide (CO) and 90.3% more HC emission.

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