Criteria

Text:
Display:

Results

Viewing 181 to 210 of 110594
2017-10-08
Technical Paper
2017-01-2401
Elana Chapman, Pat Geng, Yaowei Zhao, Susan Zhang, JunJun Ma, Jianqiang Gong
The impact of gasoline compositions to vehicle particular emission response have been widely investigated and documented with recently proposed so called Particulate Matter Index (PMI) and Particulate Evaluation Index (PEI). Vehicle PM/PN data has demonstrated correlations of the indices to vehicle response. In previous paper, global assessment with PEI on fuel sooting tendency was presented. With increasing air pollution concern and ever stringent emission requirements in China, both OEMs and oil industries are facing new challenge. Emission control requires systematic approach on both fuel and vehicle. This paper will focus on China market gasoline on fuel’s sooting tendency. Additional China vehicle response with ranges of PEI fuels are presented. In addition to PEI index, other fuel properties in gums, final boiling, aromatics, and fuel detergency are also reviewed
2017-10-08
Technical Paper
2017-01-2466
Graham Arnold
This paper intends to explore improved vehicle efficiency through a control system optimizes the use of regenerative braking in a plug-in, series, hybrid electric vehicle. Currently, vehicles are equipped with a plethora of sensing technology to supply information to the vehicle’s advanced driver assistance system (ADAS). These systems can be leveraged to also help improve vehicle efficiency by providing real time information that can help improve control strategies to maximize the usage of regenerative braking to reduce wasted energy in conventional friction braking. Advanced sensing can allow the vehicle to react before the human driver responds, allowing for the vehicle to begin deceleration through regenerative braking preemptively. This papers aims to simulate the basic functionality of such a control system to explore the potential efficiency gains available. The proposed system is simulated using a longitudinal full-vehicle model developed in MATLAB and Simulink.
2017-10-08
Technical Paper
2017-01-2425
Ramit Verma, Ramdas R Ugale
Performance improvement of regulator rectifier for 2-wheeler engine with respect to increase in power demand with upcoming stringent regulations in emerging market On two wheelers magneto generate either single or 3 phase AC power and regulator rectifier unit (RRU) do regulated rectification to charge the battery. In order to face the requirements of 2-wheeler engine with respect to upcoming stringent regulations like EFI, ABS, AHO in emerging markets like India; vehicles are demanding more electrical power from batteries. This demands higher power from magneto hence regulator rectifier unit (RRU). Higher output power forces challenges on regulator rectifier unit in terms of size, power dissipation management and reliability. In this paper how performance of RRU improved with MOSFET based regulator rectifier are discussed in comparison to silicon controller rectifier (SCR) design.
2017-10-08
Technical Paper
2017-01-2430
Yingmin Wang, Tao Cui, Fujun Zhang, Sufei Wang, Hongli Gao
Considering the randomness and instability of the oil pressure in the lubrication system, a new approach for fault detection and diagnosis of diesel engine lubrication system based on support vector machine optimized by particle swarm optimization (PSO-SVM) model and centroid location algorithm has been proposed. Firstly, PSO algorithm is chosen to determine the optimum parameters of SVM, to avoid the blindness of choosing parameters. It can improve the prediction accuracy of the model. The results show that the classify accuracy of PSO-SVM is improved compared with SVM in which parameters are set according to experience. Radial basis function (RBF) is selected as the kernel function. Optimal parameters σ=47.34, trade-off factor C =10.98, test accuracy was 99.86%. Then, the support vector machine classification interface is fitted to a curve, and the boundary conditions of fault diagnosis are obtained.
2017-10-08
Technical Paper
2017-01-2218
Roman Varbanets, Sergey Karianskyi, Sergey Rudenko, Igor V. Gritsuk, Aleksey Yeryganov, Olena Kyrylash, Nadezhda Aleksandrovskaya
Operability and efficiency of automobiles and infrastructure of stationary power and transport significantly depends on technical condition and technical operation of internal combustion engines, mostly which are diesel engines. Expedient operation of diesel engines in processes holding a timely procedure of parameters monitoring of technical condition and identification, during the work. In the article features of diagnosing of the diesel engine with uniformity of loadings distribution between cylinders provided that of ensuring normal operating state of the fuel units and components of the main systems of the diesel are considered. Results of definition of engine power, efficiency of fuel using and observance of the main ecological restrictions depending on uniformity of distribution of loadings between cylinders are presented. Also in article the main methods of diagnosing of the diesel engine in processes of its work under operating conditions are described.
2017-10-08
Technical Paper
2017-01-2183
Xiangfeng Yu, Shengcheng Li, Zhishuang Ma, Wei Du, Fengxiang Huang, Weijun Huang, Beiping Jiang
A reciprocating piston expander model based on organic Rankine cycle (ORC) is built for engine waste heat recovery. The expander characterizes by variable expansion ratio through adjusting refrigerant injection timing. This paper investigates the effect of refrigerant evaporating pressure, expansion ratio and clearance volume on the expander performance which mainly includes output power, expander efficiency, equivalent recovery efficiency, total output power, expander efficiency, weighted efficiency of expender and weighted heat recovery efficiency of expender. The results demonstrate that the total output power and the equivalent heat recovery efficiency increase with refrigerant evaporating pressure under overall operating conditions, while the increment is negligible. The expander reaches maximum total output power up to 83.442kW under c100 engine condition and 1.1MPa refrigerant evaporating pressure within the research operating conditions.
2017-10-08
Technical Paper
2017-01-2344
Robert Taylor, Hua Hu, Carl Stow, Tony Davenport, Robert Mainwaring, Scott Rappaport, Sarah Remmert
Future scenarios prepared by Shell anticipate that worldwide energy demand will approximately double by 2050, whilst at the same time, CO2 emissions need to be halved. Therefore, there is great pressure on improving efficiency of all machines, and clearly there is great focus on improving the fuel efficiency of passenger cars. The use of downsized, boosted, gasoline engines, can lead to exceptional fuel economy, and on a well-to-wheels basis, can give similar CO2 emissions to electric vehicles (depending, of course, on how the electricity is generated). A study is reported on a low weight Shell concept car, equipped with a three-cylinder 0.6 litre gasoline engine, which has achieved over 100 miles per imperial gallon, in real world driving conditions.
2017-10-08
Technical Paper
2017-01-2376
Nic Van Vuuren, Phil Armitage
Selective Catalytic Reduction (SCR) diesel exhaust aftertreatment systems are virtually indispensable to meet NOx emissions limits worldwide. These systems generate the NH3 reductant by injecting aqueous urea solution (AUS-32/AdBlue®/DEF) into the exhaust for the SCR NOx reduction reactions. Understanding the AUS-32 injector spray performance is critical to proper optimization of the SCR system. Specifically, better knowledge is required of the formation of near-nozzle deposits that have been observed on existing underfloor SCR systems. The current work presents in-situ time lapse imaging of an underfloor mounted AUS-32 exhaust-mounted urea dosing unit. The operating conditions under examination are representative of low-load low speed urban driving interspersed with high temperature exposures typical of periodic DPF regeneration.
2017-10-08
Technical Paper
2017-01-2464
Xinyou Lin, Chaoyu Wu, Qingxiang Zheng, Liping Mo, Hailin Li
The Range-extended electric vehicle (RE-EV) is a complex nonlinear system. The control strategy of REEV can be affected by numerous parameters. Firstly, the Multiple Operation Points (MOP) control strategy is proposed based on operation features of the RE-EV and combining with the optimal efficiency region of the engine. The switching logic rules of MOP strategy are designed for the desired operation mode transition, which makes the engine running at high efficiency region. Then,GA(Genetic algorithm) is implemented to search the optimal solution. The fuel consumption is defined as the target cost function. The demand power of engine is defined as optimal variable. The SOC (State of Charge) and speed are selected as the state variables. The dynamic performance of vehicle and cycling life of battery is set as the constraints. The optimal switching parameters combination is obtained based on this control strategy.
2017-10-08
Technical Paper
2017-01-2205
Velmurugan M A, MahendraMohan Rajagopal
Agricultural tractors are often subjected to various applications like front end loading work, cultivation work, where frequent forward and reverse gears are needed. Most of Indian agricultural tractors are equipped with mechanical transmission system which demands repeated clutching and de-clutching operation for such applications resulting in increased operator fatigue and lesser productivity. Also need of electronics in Indian agricultural industry for better farm mechanization is growing high. This research work depicts development of electronic bi-directional shifting (power shuttle) control design and calibration for farm vehicle fitted with wet clutch transmission.This research also reduces operator fatigue via frequent directional shift through electronic transmission. The control system is designed without any electronic interfacing with engine and also provides clutch-less gear shifting and auto-launch which offers ease to drive even for novice driver.
2017-10-08
Technical Paper
2017-01-2310
Xiaoyan Jia, Baigang Sun, Dongwei Wu, Dan Xu, Wei Zang, Wei Shang, Jie Wang
The control valve is the most important implementation part of the high pressure common rail system, and its flow characteristics have a great influence on the performance of the injector. In this paper,based on the structure and the working principle of electromagnetic injector in high pressure common rail system, the simulation model of the injector is established by AMESim software. The key parameters of the control valve, including the volume of the control chamber, the diameter of the Oil inlet hole, the hole diameter of the oil outlet and the hole diameter of the oil diffusion hole, are studied by using the model.
2017-10-08
Technical Paper
2017-01-2312
Raouf Mobasheri, Rahman Akbari
The scope of this work is to investigate the simultaneous effects of injection pressure and Exhaust Gas Recirculation (EGR) on mixture formation and engine performance in a High Speed Direct Injection (HSDI) diesel engine. For this, the computational results have been firstly compared to the measured data and a good agreement has been achieved in order to predict the in-cylinder pressure, heat release rate and the amount of NOx and soot emissions. Then, various injection pressures have been studied to explore its benefits to achieve the low exhaust emission at different EGR rates. The results show, while no EGR has been applied, decreasing the nozzle diameter causes the reduction of Indicate Specific Fuel Consumption (ISFC) with an increase in Indicated Mean Effective Pressure (IMEP). In addition, this strategy results to better air-fuel mixing, a faster combustion process, a considerable reduction of soot emissions but at the same time to a significant increase of NOx emission.
2017-10-08
Technical Paper
2017-01-2352
Gongde Liu, Li Wang, Runxiang Zhang, Chao Yang, Tengfei Shao
Fuel economy, Emission regulation and extended oil drain intervals (ODI) are the three key driving forces for engine oil development. More and more attentions have been focused on long ODI diesel engine oil both from the domestic OEMs and oil suppliers, and the ODI was being periodically improved from a normal mileage of about 10k kilometers to 60k/80k/100k or even 120k kilometers just within several years on China market. Lots and lots of factors may affect the oil life including oil properties, engine technologies, after-treatment devices and engine working conditions and so on. While from the oil side, the main factors contribute to the oil drain intervals may be the oil nitration and oxidation, soot contamination, base number deterioration and sludge accumulation and etc. There are two strategies to extend the oil longevity applied currently.
2017-10-08
Technical Paper
2017-01-2195
Mei Wang, Xianyin Leng, Zhixia He, Shengli Wei, Liang Chen, Yu Jin
The spark-ignited pre-chamber stratified combustion system is one of the most effective way to expand lean-burn ability and improve the performance of a natural gas engine. For these pre-chamber engine, the geometrical structure of orifices between the pre- and main chamber play a significant role on the gas flow and flame propagation behaviors. The present study aims at investigating the effects of the orifice number and diameter on the combustion characteristics for a Shengdong T190 engine. Various geometrical structure for pre-chamber orifices were designed, offering variations in the number of orifices (2 to 6), and in the diameter of orifices (1.66mm to 4.98mm). A non-dimensional parameter β was employed to characterize the relative flow area of the orifices in the design. CFD simulations of combustion processes for these designs were carried out using a simplified chemical reaction kinetic model for methane.
2017-10-08
Technical Paper
2017-01-2331
Amar Deep, Naveen Kumar, Harveer Singh Pali
The use of alternative fuel has many advantages and the main ones are its renewability, biodegradability and better quality exhaust gas emission, which do not contribute to raise the level of carbon dioxide in the atmosphere. The use of inedible vegetables oils as an alternative fuels for diesel engine is accelerated by the energy crisis due to depletion of resources and increase in environmental problems including the great need for edible oil as food and reduction of biodiesel production cost etc. lot of inedible vegetable oils which can be exploited for substitute fuel as diesel fuel. However there are many issues related to the use of vegetable oils in diesel engine that is high viscosity, low calorific value, high self-ignition temperature etc. Jatropha curcas has been promoted in India as a sustainable substitute to diesel fuel.
2017-10-08
Technical Paper
2017-01-2408
Lei Zhou, Hongxing Zhang, Zhenfeng Zhao, Fujun Zhang
The Opposed Piston Two-Stroke (OPTS) engine has several advantages for power density, fuel tolerance, fuel efficiency and package space. A new type of balanced opposed-piston folded-crank train two-stroke engine for Unmanned Aerial Vehicle (UAV) was studied in this paper. The effects of high altitude environment on engine performance and emissions are investigated by thermodynamic simulation. Moreover, the matching between the engine and turbocharger was designed and optimized for different altitude levels. The results indicate that a suitable turbocharger for OPTS engine can achieve the purpose of improving the quality of scavenging, lowering the fuel consumption and recovering power at high altitude environment. Finally, an optimized OPTS engine model especially for UAV is proposed in this research.
2017-10-08
Technical Paper
2017-01-2330
Leonardo Israel Farfan-Cabrera, Ezequiel Gallardo, José Pérez-González
Flouroelastomers and silicone rubbers are employed to manufacture static and dynamic seals for automotive applications since they exhibit appropriate physical and chemical properties for the engine performance. Materials for seals are selected according to their compatibility with the environment and fluids involved in the engine operation in order to prevent premature failures and leakages caused by swelling and/or changes in their mechanical properties. Thus, in particular, the use of new fuels and additives in automotive engines requires studies of compatibility with common sealing elastomers to prevent such failures. Currently, Jatropha oil is being used as a renewable source of fuel in diesel engines for electricity production, transport or agricultural mechanization in various countries. It is used either as biodiesel or as straight vegetable oil (SVO) since it has good heating power and provide exhaust gas with almost no sulfur and aromatic polycyclic compounds.
2017-10-08
Technical Paper
2017-01-2406
Wu Yang, Xiuting Yin, Zhang Song Zhan, Huixian Shen, Huibin Qing, Qingqiang Zeng, Liyun Kang
This work addresses the problem of fatigue strength prediction of crankshaft fillet rolling processes, to reduce friction losses, weights and material costs. It is usually assumed that the effect of fillet rolling process on crankshaft fatigue are conservative and empirically. A predicting method of fatigue strength for ductile cast iron crankshafts is presented, in which the rolling process is considered. The method including two parts: modelling of crankshaft fillet rolling dynamic and predicting fatigue strength of rolling process. The rolling process is solved with an implicit arithmetic and validated by the measurements and tests. Based on the crankshaft dynamic loads calculated by AVL/EXCITE Power Uint, the fatigue effect factors are considered, consisting of compressive residual stresses, work hardening, and reduction of the roughness. The predicting method is applied on a 1.5l I4 gasoline engine.
2017-10-08
Technical Paper
2017-01-2426
Zhiming Zhang, Weimin Wang, Jiangtao Wang, Jiming Zhang, Yuanda Chen, Wenlong Zhang, Guofang Yang, Fugui Fan, Wenxiang Zhang, Fengqin Huang, Xiangwang Li
Turbo-charged GDI technology is more and more widely used, which can meet the high demand of the engine performance and efficiency, but the resulting reliability and NVH issues also need to be paid attention to. Traditional NVH performance is mostly based on the experience design, repeatable test, which leads to longer development period, high cost, and also ineffective results. Along with the development of the simulation technology, NVH performance simulations play more important role in engine vibration and noise prediction. Usually The Force response analysis is used to compare the NVH performance of the engine structure, considering the standard excitation. Currently, dynamic analysis of the crank train, valve train, and piston can be carried out, and then the whole engine vibration and airborne noise can be predicted directly, considering different speed and load. In this paper, The NVH performance of a turbo-charged GDI engine is studied based on the simulation and experiment.
2017-10-08
Technical Paper
2017-01-2217
Fushui Liu, Ning Kang, Yikai Li, Pei Wang
The electronic unit pump system, which is widely applied to the heavy-duty diesel engine, belongs to the pulsating high pressure fuel injection system, and the fuel pressure fluctuations have an essential influence on the spray and combustion in the internal combustion engine. Pressure fluctuations are always aroused by the motion of actuators, such as the injector, so it is also an advantage for fault diagnosis and feedback control to ascertain the relationship between the pressure fluctuation and the motion of the actuator. In this study, experiments and 1D simulation were carried on to investigate the fuel pressure fluctuation characteristics and their connection to the transient motion of the needle valve in the injector.
2017-10-08
Technical Paper
2017-01-2207
Nobunori Okui
Next-generation vehicles which include Electric Vehicles, Hybrid Electric Vehicles and Plug-in Hybrid Electric Vehicles are researched and expected to reduce CO2 emission in the future. In order to reduce the emissions of the heavy-duty diesel plug-in hybrid vehicles (PHEV), it is necessary to provide the high exhaust-gas temperature and to keep the aftertreatment system effective. The engine starting condition of PHEV is cold, and the engine start and stop is repeated. And, the engine load of the PHEV is assisted by the electric motor. Therefore, the aftertreatment system of PHEV is not able to get the enough high exhaust-gas temperature. And, the warm-up of the exhaust-gas aftertreatment system for PHEV is spent the long time. So, it is worried about a bad effect on the emission characteristics of PHEV. In this study, we focused on the electrical heating catalyst system (EHC), which is one of the next generation electrical technologies. This test PHEV was equipped with EHC.
2017-10-08
Technical Paper
2017-01-2300
Wei Du, Juejue Lou, Fushui Liu
As known, the constant injection mass is a criterion for measuring the thermal efficiency of diesel engine. In this study, the effects of nozzle hole diameter on diesel free-spray characteristics were investigated in the condition of constant injection mass. The experiment was performed in a constant volume combustion chamber. A high pressure common-rail injector that can change nozzles was applied. Three single-hole nozzles with different hole diameter were used. High speed camera and Schlieren visualization set-up were used to capture the behaviors of liquid phase spray and vapor phase spray respectively. For liquid phase spray, the spray penetration length increased as injection time elapsed until the spray reached the saturated liquid phase spray penetration length. The reduction of hole diameter reduced the time that the liquid phase spray penetration length reached the saturated value.
2017-10-08
Technical Paper
2017-01-2313
Zenghui Yin, Xiaojun Jing, Tieqiang Fu, Hua Zhou, Chunde Yao, Jiangtao Hu, Peilin Geng
In-cylinder direct-injected technology provides a flexible and accurate optimization solution for internal combustion engines to reduce emissions and improve fuel efficiency. With increasingly stringent requirements for nitrogen oxides (NOx) and CO2 emissions, the number of injections in a engine combustion cycle has reached 2 to 3 times in gasoline direct injection (GDI) and high pressure common rail (HPCR) diesel engine. Accurate control of both the timing and quantity of injection events is critical for engine performance and emissions, while the dynamic response of the injector spray characteristic is the key factor. In this paper, a test bench was built for monitoring solenoid injector’s dynamic response, using high-speed microphotography and synchronous current collection system. Experimental study on the dynamic response of GDI and HPCR solenoid injectors was carried out.
2017-10-08
Technical Paper
2017-01-2359
Yaodong Hu, Fuyuan Yang, Minggao Ouyang
Energy saving is becoming one of the most important issues for the next generation of commercial vehicles. The fuel consumption limits for commercial vehicles in China have stepped into the third stage, which is a great challenge for heavy duty commercial vehicles. Hybrid technology provides a promising method to solve this problem, of which the dual motor coaxial series parallel configuration is one of the best options. Compared with P2 configuration, the powertrain can not only operate in pure electric or parallel mode, but also can operate in series, which shows better flexibility. In this paper, regulations on test cycle, fuel consumption test methods and its limits of the third stage will be introduced and explained in detail. Then, the quasi static models of the coaxial series parallel powertrain with/without gearbox under C-WTVC cycle are built.
2017-10-08
Technical Paper
2017-01-2417
Houchuan Fan, Jimin Ni, Xiuyong Shi, Nan Jiang, Dayong Qu, Yi Zheng, Yinghong Zheng
An electronic waste-gated turbocharger for automotive application can accurately control the boost pressure and can also effectively reduce the turbo-lag. It improve the transient responsive performance of engine and the acceleration performance, which make vehicle have a better adaptation to the complex traffic environment. A detail analysis of aerodynamic working principle is the foundation for the optimal control strategy of electronic waste-gated turbocharger. The study, in which the influence of the valve opening on the performances of electronic waste-gated turbocharger turbine under the condition having periodic pulse exhaust gas of engine, has the practical application value. This paper discusses the unsteady performances and mass flow characteristics of a turbocharger turbine with an electronic waste-gate under different valve opening conditions using numerical simulation method, based on a unified periodic pulse inlet wave.
2017-10-08
Technical Paper
2017-01-2432
Xiangwang Li, Weimin Wang, Xiongcai Zou, Zhiming Zhang, Wenlong Zhang, Shemin Zhang, Tao Chen, Yuhuang Cao, Yuanda Chen
In order to reduce emissions, size and manufacturing cost, integrated exhaust manifold become popular in gasoline engine, especially in three-cylinder engine. Moreover, due to shorter length, lighter weight, and less component connections, the exhaust manifold and hot end durability will improve apparently. In this work, an advanced cylinder head with integrated exhaust manifold is in adopted in one three-cylinder turbo engine. Because of this integration characteristic, the gas retain in cylinder head longer and the temperature reach higher level than normal cylinder head, which will cause thermal fatigue failure more easily. To validate the exhaust manifold and hot end durability, series simulation and test validation work have been done. Firstly, overall steady state and transient temperature simulation was done for global model. The global model include cylinder head, block, turbocharger, and catalyst components.
2017-10-08
Technical Paper
2017-01-2453
Shuang Liu, Lina Pan, Xin Jiang, Yujiao Wang, Kun Liu, Yang Xia
Quick drop battery system was the core components of the electric vehicles, the reliability and compatibility of quick drop battery system was directly related to the popularization and application of electric vehicles. In this article, a split type battery management system and a split type high voltage architecture is used to achieve better charging compatibility. Meanwhile the number of fast switching connector’s pin is reduced and the plug life is prolonged to more than 10000 times by using floating structure. For battery management system (BMS), the state of charge (SOC) estimation was based on dynamic voltage correction, and make estimation accuracy reach to less than 5%. Rotary slot limit and fast locking mechanism had been designed for the first time and the precision of battery system assembling could control within 3mm, hence the floating structure’s damage could be reduced and the mechanical life could be enhanced.
2017-10-08
Technical Paper
2017-01-2437
Renjith S, Vinod Kumar Srinivasa, Umesh Venkateshaiah
The jet lubrication method is extensively used in the constant mesh high performance transmission system operating at range of speeds though it affects mechanical efficiency through spin power loss. The lubrication jet has a key role to maintain the meshing gears at non-fatal thermal equilibrium by effectively dissipating the heat generated to the surrounding. Heat Transfer coefficient (HTC) is the indicator of the thermal behavior of the system, which provides great insight of efficient lubrication system that needs to be employed for prescribed type of transmission. 1D and 3D simulations are of countless value in optimizing the automotive power train transmission system performance parameters. Thermal performance prediction of the jet lubricated transmission system through 3D CFD analysis is quite comprehensive task compared to 1D analysis. Both 1D and 3D methods complement each other to great extent in design process and one such exercise is demonstrated in the current activity.
2017-10-08
Journal Article
2017-01-2291
Sandro Gail, Takashi Nomura, Hitoshi Hayashi, Yuichiro Miura, Katsumi Yoshida, Vinod Natarajan
In emerging markets, Port Fuel Injection (PFI) technology retains a higher market share than Gasoline Direct Injection (GDI) technology. In these markets fuel quality remains a concern even despite an overall improvement in quality. Typical PFI engines are sensitive to fuel quality regardless of brand, engine architecture, or cylinder configuration. One of the well-known impacts of fuel quality on PFI engines is the formation of Intake Valve Deposits (IVD). These deposits steadily accumulate over time and can lead to a deterioration of engine performance. IVD formation mechanisms have been characterized in previous studies. However, no test is available on a state-of-the-art engine to study the impact of fuel components on IVD formation. Therefore, a proprietary engine test was developed to test several chemistries. Sixteen fuel blends were tested. The deposit formation mechanism has been studied and analysed.
2017-10-08
Journal Article
2017-01-2257
Linjun Yu, Yanfei Li, Bowen Li, Hao-ye Liu, Zhi Wang, Xin He, Shi-jin Shuai
This study compares the combustion and emission performance of gasoline Homogeneous Charge Compression Ignition (HCCI) and Multiple Premixed Compression Ignition (MPCI) in a single-cylinder, intake-boosting and water-cooling diesel engine with a compression ratio of 16.7. The test fuel was commercial gasoline in China with RON of 92, and intake pressure varied from 0.16 to 0.21 MPa, while Indicated Mean Effective Pressure (IMEP) was fixed at 1.0 MPa. Both the knock limit and misfire limit of gasoline HCCI were studied. The results showed that Low Temperature Heat Release (LTHR) was observed before High Temperature Heat Release (HTHR) in gasoline HCCI, and the LTHR accounted for less than 10 percent of total heat release. The knock limit and misfire limit of gasoline HCCI coincided when the intake pressure decreased to 0.16 MPa. Increasing the intake pressure helped to promote the Indicated Thermal Efficiency (ITE) for both gasoline HCCI and MPCI.
Viewing 181 to 210 of 110594