Turbocharging Systems With Control Intervention for Medium Speed Four-Stroke Diesel Engines

1989 ◽  
Vol 111 (3) ◽  
pp. 560-569 ◽  
Author(s):  
E. Meier ◽  
J. Czerwinski
Keyword(s):  
Diesel Engines ◽  
Engine Speed ◽  
Engine Performance ◽  
Exhaust Gas ◽  
Full Load ◽  
Medium Speed ◽  
Power Turbine ◽  
Control Intervention ◽  
Turbocharging System ◽  
Compressor Surge

The turbocharging systems of highly boosted four-stroke diesel engines (BMEP 25 bar/363 psi) have to cope with two basic problems: lack of air and compressor surge at reduced engine speed. In the case of medium speed engines for ship propulsion and stationary applications, the following three control interventions have proved to be successful solutions: (1) waste gating air or exhaust gas at full load and speed, (2) using a compounded or independent exhaust gas driven power turbine that can be shut off at part load and speed, and (3) blowing air from the compressor outlet to the turbine inlet through a controlled bypass. The effect of these control interventions on engine performance is shown by examples and analyzed by means of characteristic quantities for the efficiency of the turbocharging system and the engine. The definitions and meanings of these quantities are explained in the first part of the paper.

A Performance Evaluation of a Three Splitter Diffuser and Vaneless Diffuser Installed on the Power Turbine Exhaust of a TF40B Gas Turbine

1998 ◽  
Author(s):  
Howard Harris ◽  
Ivan Piñeiro ◽  
Tom Norris
Keyword(s):  
Field Test ◽  
Engine Performance ◽  
Pressure Recovery ◽  
Exhaust Gas ◽  
Test Results ◽  
Gas Temperature ◽  
Vaneless Diffuser ◽  
Recovery Coefficient ◽  
Power Turbine ◽  
Exhaust Gas Temperature

A field test was conducted on a three splitter diffuser and a vaneless diffuser (no splitters) to determine, the pressure recovery coefficient, effects on engine performance, exhaust collector temperature distribution, and exhaust gas noise. This paper presents the cause of the mechanical failure of the three splitter diffuser, basic diffuser design, field test instrumentation, and the test results. The test results found the vaneless diffuser had a higher pressure recovery, created a lower back pressure, and did not raise the exhaust gas temperature (EGT) nor fuel consumption of the engine, as compared to the three splitter diffuser.

Set-Point Adaptation Strategy of Air Systems of Light-Duty Diesel Engines for NOx Emission Reduction Under Acceleration Conditions

2018 ◽  
Vol 140 (7) ◽  
Author(s):  
Kyunghan Min ◽  
Haksu Kim ◽  
Manbae Han ◽  
Myoungho Sunwoo
Keyword(s):  
Diesel Engines ◽  
Performance Optimization ◽  
Control Structure ◽  
Engine Performance ◽  
Optimization Method ◽  
Driving Cycle ◽  
Operating Conditions ◽  
Nox Emission ◽  
Exhaust Gas ◽  
Set Point

Modern diesel engines equip the exhaust gas recirculation (EGR) system because it can suppress NOx emissions effectively. However, since a large amount of exhaust gas might cause the degradation of drivability, the control strategy of EGR system is crucial. The conventional control structure of the EGR system uses the mass air flow (MAF) as a control indicator, and its set-point is determined from the well-calibrated look-up table (LUT). However, this control structure cannot guarantee the optimal engine performance during acceleration operating conditions because the MAF set-point is calibrated at steady operating conditions. In order to optimize the engine performance with regard to NOx emission and drivability, an optimization algorithm in a function of the intake oxygen fraction (IOF) is proposed because the IOF directly affects the combustion and engine emissions. Using the NOx and drivability models, the cost function for the performance optimization is designed and the optimal value of the IOF is determined. Then, the MAF set-point is adjusted to trace the optimal IOF under engine acceleration conditions. The proposed algorithm is validated through scheduled engine speeds and loads to simulate the extra-urban driving cycle of the European driving cycle. As validation results, the MAF is controlled to trace the optimal IOF from the optimization method. Consequently, the NOx emission is substantially reduced during acceleration operating conditions without the degradation of drivability.

scholarly journals Effect of Biodiesel B100 and Ethanol Blends on the Performance of Small Diesel Engine

2021 ◽  
Vol 2 (2) ◽  
pp. 101
Author(s):  
Alfian Firdiansyah ◽  
Nasrul Ilminnafik ◽  
Agus Triono ◽  
Muh Nurkoyim Kustanto
Keyword(s):  
Diesel Engine ◽  
Diesel Engines ◽  
Alternative Energy ◽  
High Efficiency ◽  
Engine Performance ◽  
Exhaust Gas ◽  
Calophyllum Inophyllum ◽  
Ethanol Blends ◽  
High Level ◽  
Test Fuel

<p class="02abstracttext"><span lang="IN">A small diesel engine is a machine that has high efficiency but causes a high level of pollution. The most widely used fuel so far is fossil energy which is unrenewable energy. The fruit of the Calophyllum inophyllum plant has great potential to be developed as alternative energy for small diesel engines. In this study, the test fuel used was D100, B100, E5, E10, and E15. The small engine diesel used TG-R180 Diesel with a compression ratio of 20:1 at engine turns 1500, 1800, 2100, and 2400 rpm, and the braking load at a constant prony disc brake is 1,5 kg/cm<sup>2</sup>. The result of the study using E10 fuel can improve engine performance and can reduce the opacity of the exhaust gas. The highest power in the D100 fuel at 2100 rpm is 8,06 PS. The highest thermal efficiency of E10 fuel is 50,29%. The use of Calophyllum inophyllum biodiesel (B100) can reduce exhaust gas opacity in small diesel engines when compared to the use of D100. E10 fuel has the lowest exhaust gas opacity rate of 4,1%.</span></p>

Effect of balance valve on an asymmetric twin-scroll turbine for heavy-duty diesel engine

2020 ◽  
pp. 146808742093016
Author(s):  
Jianjiao Jin ◽  
Jianfeng Pan ◽  
Zhigang Lu ◽  
Qingrui Wu ◽  
Lizhong Xu
Keyword(s):  
Fuel Economy ◽  
High Speed ◽  
Engine Speed ◽  
Flow Parameter ◽  
Engine Performance ◽  
Exhaust Gas Recirculation ◽  
Exhaust Gas ◽  
Engine Fuel ◽  
Recirculation Rate ◽  
Gas Recirculation

A conventional asymmetric twin-scroll turbine with wastegate is capable of effectively tackling down the contradiction between fuel economy degradation and low nitrogen oxide emissions. However, as the engine speed has been rising at middle- and high-speed ranges, the pressure of small scroll inlet will be increasingly higher as compared with the intake pressure, thereby worsening fuel economy. In this study, a novel turbocharging technology of asymmetric twin-scroll turbine with a balance valve was first analyzed to more effectively balance the engine fuel economy and emission. The experiments on turbine test rig and engine performance were performed to explore the effects of balance valve on turbine performance, asymmetric ratio, exhaust gas recirculation rate, as well as engine performance. As the balance valve open degree was elevated, the turbine flow parameter was being extended, while the turbine efficiency was enhanced. Moreover, a lower asymmetric ratio could lead to a broader flow parameter range between that of partial admission and equal admission, thereby resulting in a broader regulating range of exhaust gas recirculation rate. In contrast with the asymmetric twin-scroll turbine with wastegate, the turbine running efficiency of asymmetric twin-scroll turbine with balance valve was enhanced by nearly 2%–11% at middle and high engine speed ranges, while the fuel economy was improved by nearly 1.5%–8%.

Airpath Controls of Turbocharged Diesel Engines With Disturbance Input Observers

2008 ◽  
Author(s):  
Chia-Shang Liu
Keyword(s):  
Diesel Engines ◽  
Disturbance Observer ◽  
Coupling Effect ◽  
Engine Performance ◽  
Intake Manifold ◽  
Exhaust Gas ◽  
Engine Model ◽  
Emission Regulation ◽  
Classical Control ◽  
Intake Manifold Pressure

To achieve stringent emission regulation standard and deliver desired engine performance, modern diesel engines are equipped with an exhaust gas recirculation system and a turbocharger to regulate the fraction of exhaust gas and intake manifold pressure. Due to the actuator coupling effect and the high nonlinearity of the system behavior, it is difficult to apply classical control designs in such a case. To solve this issue, this paper presents a disturbance observer based approach for the airpath controls of turbocharged diesel engines. The disturbance observer is synthesized with the controller to compensate the unknown dynamics and system uncertainties of the engine plant that will make the controller more robust and less dependent on the accuracy of mathematical modeling. The performance of proposed observer and controller schemes are demonstrated by numerical simulation with a full order diesel engine model.

Performance Analysis of an Electric Turbocompounding System for a Hybrid Vehicle Diesel Engine

2015 ◽  
Author(s):  
Zhanming Ding ◽  
Weilin Zhuge ◽  
Yangjun Zhang ◽  
Yong Yin ◽  
Shuyong Zhang
Keyword(s):  
Diesel Engine ◽  
Waste Heat ◽  
Combustion Engine ◽  
Control Strategies ◽  
Full Range ◽  
Engine Performance ◽  
Driving Cycle ◽  
Operating Conditions ◽  
Full Load ◽  
Power Turbine

Waste heat recovery (WHR) is one of the main approaches to improve the internal combustion engine (ICE) overall efficiency and reduce emissions. The electric turbocompounding (ETC) technology is considered as a promising WHR technology for vehicle engines due to its compactness and light weight. In order to improve the overall fuel efficiency of the engine at practical operating conditions, the impacts of the implementation of the ETC system should be investigated not only at engine full load conditions, but also under practical driving cycles. In this paper, an ETC system was designed for a 4.75 L diesel engine, in which a power turbine was installed down-stream to the turbocharger turbine. A performance simulation model of the ETC engine was developed on the basis of the diesel engine model, which was validated against engine performance experimental data. The control strategies of the wastegate of turbocharger turbine, the wastegate of power turbine and the operating torque of generator were determined. The relative variation in BSFC was studied under full range of operating conditions, and results show that the maximum improvement of fuel economy is 6.7% at an engine speed of 1000 rpm and 70% of full load, in comparison with the baseline diesel engine. Main factors lead to the performance differences between the ETC engine and the baseline engine were analyzed. Furthermore, the performance of the ETC engine under the C-WTVC driving cycle was investigated. Results show that the implementation of the ETC system resulted in a 1.2% fuel consumption reduction under the C-WTVC driving cycle.

Investigation of EGR With EGB (Exhaust Gas Bypass) on Low Speed Marine Diesel Engine Performance and Emission Characteristics

2017 ◽  
Author(s):  
Zhanguang Wang ◽  
Song Zhou ◽  
Yongming Feng ◽  
Yuanqing Zhu
Keyword(s):  
High Pressure ◽  
Diesel Engine ◽  
Diesel Engines ◽  
Engine Performance ◽  
Simulation Software ◽  
Nox Emissions ◽  
Exhaust Gas ◽  
Performance And Emission ◽  
High Efficient ◽  
Marine Diesel

In 2016, the International Maritime Organization (IMO) has enforced stricter nitrogen oxide (NOx) emission standards. Exhaust gas recirculation (EGR) technology is an effective way to achieve IMO Tier III standards for two-stroke marine diesel engines. This paper selected the 6S50ME-C8.2 diesel engine for the study, by making use of GT-POWER simulation software. In this paper, three different types of EGR were built to investigate the effects of EGR on engine performance and NOx emissions. The results show that both the high pressure EGR system and the low pressure EGR system can reduce NOx emissions with the power drop and BSFC risen. While in the high pressure EGR system combined with EGB, more NOx can be reduced with less power drop and BSFC risen. What is more, the running points of the compressor are still in the high efficient area and away the surge margin. Based on the conclusions, the results obtained in this paper can offer reference for the turbocharged diesel engines with EGR system to reduce NOx emissions and improve engine performance.

Turbocharging a Medium Speed Diesel Engine to Suit Different Applications

2001 ◽  
Author(s):  
Andrei Ludu ◽  
Gernot Athenstaedt ◽  
Stephen G. Dexter
Keyword(s):  
Power Generation ◽  
Diesel Engine ◽  
Engine Speed ◽  
Engine Performance ◽  
Fine Tuning ◽  
Engine Operation ◽  
Application Range ◽  
Drilling Rig ◽  
Marine Propulsion ◽  
Medium Speed

Abstract The turbocharger match plays a key role for a successfully developed engine. Properly matched turbochargers ensure a good gas exchange, the right air flow rates, and air-fuel ratios as required for the combustion fine tuning. AVL LIST GmbH in Graz, Austria, starting from a blank computer display, designed, developed and tested a medium speed diesel engine to cover three applications: power generation, marine propulsion and drilling rig drive. The 12 cylinder vee engine has 2370 HP rated power at 1500 rpm rated engine speed. For the drilling rig drive application 8% torque backup at low engine speed is available. The turbocharging challenge was to specify a turbocharger to suit all three applications. Thus, the turbocharger operation ranged from the constant engine speed operation for power generation, to variable engine speed operation for marine propulsion and with torque backup for the drilling rig drive application. The paper reports test results which demonstrate that AVL could match the engine over a wide application range. The engine performance and system layout calculations performed prior to testing were validated by tests. The engine performance software used is presented. A special emphasis is placed on the implementation, operation and impact of a bypass and waste-gate system as an aid to match the turbocharger for the engine operation with torque back-up.

Experimental investigation to study the effects of using hot and partially cold EGR in direct injection diesel engine

TECHNOLOGY ◽  
2016 ◽  
Vol 04 (03) ◽  
pp. 170-173 ◽  
Author(s):  
Radhey Sham ◽  
Rajesh Kumar Saluja ◽  
Gurwinder Singh ◽  
Vineet Kumar ◽  
Shubham Parmar
Keyword(s):  
Diesel Engine ◽  
Diesel Engines ◽  
High Performance ◽  
Direct Injection ◽  
Engine Performance ◽  
Exhaust Gas ◽  
Performance Parameters ◽  
Heavy Duty ◽  
Heavy Duty Diesel ◽  
Gas Recirculation

Major exhaust emissions from diesel engines are CO, CO2, PM, UHC and NOx, of which NOx is one of the most harmful. A number of techniques have been utilized to control NOx emissions and exhaust gas recirculation (EGR) is one of the widely used techniques that show outstanding results in NOx reduction in both light and heavy duty diesel engines. In the present study, the experiment has been conducted on a four-stroke, single-cylinder water cooled diesel engine. Here, a long-route EGR system was used in both hot (insulated) and partially cooled (without insulation) conditions. EGR rate was varied from 0 to 24% in steps of 6% and the engine ran at various load conditions. The research objective was to investigate the effects of varying EGR ratios and temperatures on engine performance parameters and determine the effective EGR rate where the engine gives high performance, low fuel consumption and produces low emissions.

Sign in / Sign up

Export Citation Format

Share Document