Investigation of Performance and Fuel Economy for Cylinder Deactivation Engine at Part Load Operation

2016 ◽  
Vol 819 ◽  
pp. 443-448 ◽  
Author(s):  
S.F. Zainal Abidin ◽  
Mohd Farid Muhamad Said ◽  
Azhar Abdul Aziz ◽  
Mohd Azman Abas ◽  
N.I. Arishad
Keyword(s):  
Fuel Economy ◽  
Fuel Injection ◽  
Injection Timing ◽  
Original Performance ◽  
Part Load ◽  
Automotive Engine ◽  
Engine Efficiency ◽  
Efficiency Performance ◽  
Valve Opening ◽  
Load Conditions

In automotive engine applications, the spark ignition (SI) engines can operate at various engine speed and load conditions. However, most of the time was spend at part load operations, where they operate below their rated output especially during cruising or idling. The needs of improvement in term of engine efficiency at part load operation become more popular among the engine manufacturers. One of the main reasons for efficiency dropped at part load conditions is the flow restrictions at the throttle valve opening area due to nearly-close position to control amount of inducted air into the cylinder, which leads to increasing in pumping losses. Hence, there are a lot of studies and investigations have been carried out to tackle these problems without sacrificing the original performance. This paper will investigate further the engine efficiency, performance as well as fuel economy by using one-dimensional (1-D) simulation tool. A baseline simulation model of a 1.6 liters four cylinders, port fuel injection engine has been developed based on the actual engine geometries. This baseline model applied predictive combustion to predict the amount of cylinder pressure based on actual ignition and injection timing on bench. The simulated results show a very good agreement with the measured data. Additionally, this study also proved that the deactivation half of the cylinders can significantly reduce the pumping losses of fired cylinder while eliminated the pumping work of unfired cylinders.

THE STUDY OF THE EFFECT OF INTAKE VALVE TIMING ON ENGINE USING CYLINDER DEACTIVATION TECHNIQUE VIA SIMULATION

2015 ◽  
Vol 77 (8) ◽  
Author(s):  
S. F. Zainal Abidin ◽  
M. F. Muhamad Said ◽  
Z. Abdul Latiff ◽  
I. Zahari ◽  
M. Said
Keyword(s):  
Fuel Consumption ◽  
Internal Combustion Engines ◽  
Gasoline Engine ◽  
Engine Performance ◽  
Intake Valve ◽  
Cylinder Deactivation ◽  
Part Load ◽  
Engine Model ◽  
Engine Efficiency ◽  
Load Conditions

There are many technologies that being developed to increase the efficiency of internal combustion engines as well as reducing their fuel consumption.  In this paper, the main area of focus is on cylinder deactivation (CDA) technology. CDA is mostly being applied on multi cylinders engines. CDA has the advantage to improve fuel consumption by reducing pumping losses at part load engine conditions. Here, the application of CDA on 1.6L four cylinders gasoline engine is studied. One-dimensional (1D) engine modeling work is performed to investigate the effect of intake valve strategy on engine performance with CDA. 1D engine model is constructed based on the 1.6L actual engine geometries. The model is simulated at various engine speeds at full load conditions. The simulated results show that the constructed model is well correlated to measured data. This correlated model is then used to investigate the CDA application at part load conditions. Also, the effects on the in-cylinder combustion as well as pumping losses are presented. The study shows that the effect of intake valve strategy is very significant on engine performance. Pumping losses is found to be reduced, thus improve fuel consumption and engine efficiency.

The Effects of Injection Parameters on the Performance of Common Rail Light Duty Engine Fueled with Palm Oil Biodiesel

2013 ◽  
Vol 465-466 ◽  
pp. 322-326 ◽  
Author(s):  
M. Adlan Abdullah ◽  
Farid Nasir Ani ◽  
Masjuki Hassan
Keyword(s):  
Diesel Engine ◽  
Palm Oil ◽  
Fuel Economy ◽  
Fuel Injection ◽  
Control Strategies ◽  
Engine Performance ◽  
Common Rail ◽  
Injection Timing ◽  
Injection Duration ◽  
Injection Parameters

It is in the interest of proponents of biodiesel to increase the utilization of the renewable fuel. The similarities of the methyl ester properties to diesel fuel and its miscibility proved to be an attractive advantage. It is however generally accepted that there are some performance and emissions deficit when a diesel engine is operated with biodiesel. There are research efforts to improve the diesel engine design to optimize the combustion with biodiesel. Since the common rail engines operates on flexible injection strategies, there exist an opportunity to improve engine performance and offset the fuel economy deficit by means of optimizing the engine control strategies. This approach may prove to be more practical and easily implemented. This study investigated the effects of the fuel injection parameters - rail pressure, injection duration and injection timing - on a common rail passenger car engine in terms of the fuel economy. Palm oil based biodiesel up to 30% blend in diesel was used in this study. The end of injection, (EOI), was found to be the most important parameter for affecting fuel consumption and thermal efficiency.

Design and Development of Double Helix Fuel Injection Pump for Four Stroke V-16 Rail Traction Diesel Engine

2007 ◽  
Author(s):  
A. K. Kathpal ◽  
Anirudh Gautam ◽  
Avinash Kumar Agarwal ◽  
R. Baskaran
Keyword(s):  
Diesel Engine ◽  
Fuel Economy ◽  
Fuel Injection ◽  
Double Helix ◽  
Fuel Efficiency ◽  
Injection System ◽  
Injection Timing ◽  
Fuel Injection System ◽  
Injection Pump ◽  
Fuel Injection Pump

The diesel fuel-injection system of ALCO DLW 251 engine consists of single cylinder injection pumps, delivery pipes, and fuel injector nozzles. Fuel injection into the combustion chamber through multi-hole nozzles delivers designed power and fuel efficiency. The two most important variables in a fuel injection system of a diesel engine are the injection pressure and injection timing. Proper timing of the injection process is essential for satisfactory diesel engine operation and performance. Injection timing needs to be optimised for an engine based on requirements of power, fuel economy, mechanical and thermal loading limitations, smoke and emissions etc. Since each of these requirements varies with the operating conditions, sometimes contrary to the requirements of the other parameters, the map of optimised injection timing can be very complex. The ALCO DLW 251 engine’s fuel injection pump is jerk type to permit accurate metering and timing of the fuel injected. The pump has a ported barrel and constant-stroke plunger incorporating a bottom helix for fuel delivery control with constant injection timing. From the point of view of good power and fuel economy, combustion should take place so that the peak firing pressure occurs at about 10–15° after TDC and is usually a few degrees after combustion starts. For this to happen, fuel should be injected at an appropriate time, depending on Injection delay and Ignition delay. Both these factors are dependent on the speed and load. Changing the operating point of the engine may change either one or both types of delay, altering the moment of start of combustion. Various researchers have shown that both the Injection and the Ignition delay are reduced as the engine speed is decreased resulting in advancement of injection timing at lower speeds (and loads). This condition will be corrected by varying the static injection timing, which can be achieved by providing a modified helix on the plunger to delay the start of fuel injection, for the lower speeds and loads. A new double helix (upper and lower helix) fuel injection pump for the ALCO DLW 251 16 V engine has been designed. The new fuel injection pump has been tested on the engine test cell at Research Designs & Standards Organisation and has shown an improvement of 1.2% in locomotive duty cycle fuel consumption. This paper describes the design & development of double helix fuel injection pump and discusses the engine tests completed to verify the projected improvements in fuel efficiency.

Influence of injection valve opening manner and injection timing on mixing effect of direct injection compressed natural gas–fueled engine

2020 ◽  
pp. 146808742093135
Author(s):  
Tianbo Wang ◽  
Lanchun Zhang ◽  
Shaoyi Bei ◽  
Zhongwei Zhu
Keyword(s):  
Fuel Injection ◽  
Direct Injection ◽  
Combustion Process ◽  
Injection Timing ◽  
Mixing Process ◽  
Mixing Effect ◽  
Injection Mode ◽  
Valve Opening ◽  
Gas Fuel ◽  
Gas Fueled

In order to improve the control precision of in-cylinder mixing and combustion process, and to avoid the engine power drop because of the port fuel injection mode, it becomes a tendency to inject gas fuel into cylinder directly, with the help of the high-pressure gas-fueled injection device. However, considering that the mixing speed of gas fuel with air is usually slower than that of gasoline or diesel, the gas fuel direct injection mode tends to cause poor mixing performance and insufficient combustion in engine. Based on this situation, in-cylinder mixing process of direct injection gas–fueled engine is taken as the research object in this article. The three-dimensional transient computational fluid dynamics model of the injection and mixing process in gas-fueled direct injection engine is established to analyze the effects of the poppet valve opening manner and injection timing on the in-cylinder mixing homogeneity. The results indicate that delaying the injection timing can improve the wall impact strength and help to form a tumble flow in the cylinder. The stronger wall impact and tumble flow can reverse the natural diffusion law and greatly improve the in-cylinder mixing effect. Under the same injection timing conditions, although the pull-open valve has a larger injection penetration distance, the in-cylinder mixing effect is still worse than the push-open one. This is because, for the push-open valve, the fuel jet will be around the slope of the valve, which is beneficial to improve the mixing effect.

scholarly journals Influence and strategy optimization of fuel injection timing on PN and fuel consumption

2021 ◽  
Vol 268 ◽  
pp. 01053
Author(s):  
Liyun Qian ◽  
Yimin Wang ◽  
Zhikun Deng ◽  
Lihui Wang ◽  
Xionghui Zou
Keyword(s):  
Fuel Consumption ◽  
Gasoline Engine ◽  
Fuel Injection ◽  
Operating Conditions ◽  
Injection Timing ◽  
Fuel Injection Timing ◽  
Medium Speed ◽  
Low Load ◽  
The Impact ◽  
Load Conditions

During the development of a CN Ⅵ light vehicle equipped with a GDI gasoline engine, the phenomenon of high PN appeared. In response to the operating conditions of the engine running in the WLTC cycle, a corresponding SOI sweep was performed on the dyno bench. The PN emissions of the engine has reduced by optimizing of SOI. The results show that when the SOI is sufficiently advanced, the oil film formed by the collision of the spray and the piston causes the PN emissions to increase significantly. In order to avoid the deterioration of the PN emissions, the SOI should be appropriately postponed. In the low load conditions, it is more appropriate to calibrate the SOI at 295°CA and 290°CA. In the medium speed area, it is more suitable to set it at 300°CA or later. The SOI in the higher speed area can be slightly advanced if necessary. And the impact of SOI on fuel consumption is more obvious at low speeds, but it is not obvious at the conditions of medium to high loads and speeds.

Torch Ignition: Ideal for Lean Burn Premixed-Charge Engines

1994 ◽  
Vol 116 (4) ◽  
pp. 793-798 ◽  
Author(s):  
N. S. Mavinahally ◽  
D. N. Assanis ◽  
K. R. Govinda Mallan ◽  
K. V. Gopalakrishnan
Keyword(s):  
Combustion Chamber ◽  
Fuel Economy ◽  
Thermal Efficiency ◽  
Lean Burn ◽  
Ignition System ◽  
Part Load ◽  
Full Load ◽  
Spark Plug ◽  
Initiation And Propagation ◽  
Load Conditions

Sluggish flame initiation and propagation, and even potential misfiring, become major problems with lean-fueled, premixed-charge, spark-ignited engines. This work studies torch ignition as a means for improving combustion, fuel economy, and emissions of a retrofitted, large combustion chamber with nonideal spark plug location. A number of alternative configurations, employing different torch chamber designs, spark-plug locations, and materials, were tested under full-load and part-load conditions. Results indicate a considerable extension of the lean operating limit of the engine, especially under part-load conditions. In addition, torch ignition can lead to substantial thermal efficiency gains for either leaner or richer air-fuel ratios than the optimum for the conventional ignition system. On the richer side, in particular, the torch-ignited engine is capable of operating at maximum brake torque spark timings, rather than compromised, knock-limited spark timings used with conventional ignition. This translates into thermal efficiency improvements as high as 8 percent at an air-fuel ratio of 20:1 and full load.

Research of a Variety of Fuel Injection Timing Control Experiment Station for Automotive Engine

2012 ◽  
Vol 605-607 ◽  
pp. 92-95
Author(s):  
Ji Hong Zhang ◽  
Mao Feng Shou ◽  
Li Shi
Keyword(s):  
Fuel Injection ◽  
Injection Timing ◽  
Engine Fuel ◽  
Automotive Engine ◽  
Experiment Station ◽  
Injection Process ◽  
Working Principle ◽  
Model Engine ◽  
Professional Teaching ◽  
Injection Experiment

According to the requirements of the automotive professional teaching, design and development of the automobile engine to a variety of fuel injection experiment station. The structure and working principle of the Experiment Station has been introduced, the bench control with microcontroller program and can test on a variety of model engine fuel injection process by simulating a variety of engine fuel injection law.

Effects of intake valve opening duration on performance optimization of an Atkinson cycle engine under part load

2021 ◽  
pp. 095440702110105
Author(s):  
Qingyu Niu ◽  
Baigang Sun ◽  
Yue Wu ◽  
Lingzhi Bao ◽  
Qinghe Luo
Keyword(s):  
Fuel Economy ◽  
Performance Optimization ◽  
Operating Conditions ◽  
Intake Valve ◽  
Compression Pressure ◽  
Part Load ◽  
Atkinson Cycle ◽  
Lower Load ◽  
Valve Opening ◽  
Dimensional Simulation

A comprehensive analysis of the intake valve opening duration (IVOD) effects on the performance of an Atkinson cycle engine is conducted in this work using numerical simulation and experimental validation. Through one-dimensional simulation, the relationship between the range of IVOD and the compression ratios is firstly investigated under the constraint of compression pressure. Two representative IVOD, 295 and 314°CA, are then respectively applied to the performance simulation and experiment of a practical Atkinson cycle engine. The simulation shows the combination of a late intake valve opening timing (IVO) angle and a late exhaust valve opening timing (EVO) angle is profitable for improving the fuel economy under part load operating conditions (i.e. 2000 rpm@2 bar and 3000 rpm@3 bar). The experimental results present the Atkinson cycle engine under both IVOD scenarios considerably improves the brake specific fuel consumption (BSFC) and reduces the pumping mean effective pressure (PMEP) compared to those of the original Otto cycle engine. Meanwhile, the comparison between two IVOD scenarios show that the shorter IVOD leads to an improvement of indicated thermal efficiency, especially at lower load. Considering fuel economy, a shorter IVOD is more favorable at part load for the Atkinson cycle engine. Two main contributions of this work are to numerically quantify the IVOD range for the Atkinson cycle engine under part load, and to experimentally validate the effectiveness of simulation. The findings of this work are expected to support the design of Atkinson cycle engines and provide a guideline of IVOD optimization under part load.

Design Concept and Development of a Heavy-Duty Truck Diesel Engine for Better Fuel Economy

1983 ◽  
Vol 105 (3) ◽  
pp. 690-696
Author(s):  
A. Kobayashi ◽  
M. Ozawa ◽  
M. Noda ◽  
K. Kikuchi
Keyword(s):  
Fuel Economy ◽  
Fuel Injection ◽  
Engine Performance ◽  
Design Concept ◽  
Injection Timing ◽  
Heavy Duty ◽  
Heavy Duty Truck ◽  
Engine Combustion ◽  
New Material ◽  
Haul Truck

Due to the increasing price of fuel, demands for fuel economy of heavy-duty trucks become severer year by year, and many efforts, such as reduction of air drag of vehicle, optimization of transmission and engine performance, improvement of engine combustion, etc., have been taken to meet these demands. However, requirements for the reduction of fuel consumption are expected to become even more critical, so the authors have studied a new design concept for heavy duty truck diesel engines to satisfy these requirements. The basic idea for getting a fuel-economic engine is to make the engine as small as possible and also to apply higher boost turbocharging for obtaining a sufficiently high output. However, measures to improve the undesirable problems which conventional turbocharged engines possess, such as lack of acceleration response and low-speed torque, increase of thermal and mechanical loads, shortage of engine brake torque, poor cold start ability, etc., should also be pursued. A chassis-mounted air-to-air intercooler, inertia-charged air induction system, highly backward-curved impeller of turbocharger, electronically controlled fuel injection timing device, etc., have been applied. And a new design technique as well as new material and construction have also been applied. This engine was installed to a long-haul truck with a gross weight of around 20,000 kg (44,000 lbs) and got better fuel mileage, as expected.

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