论文已在中国上海举行的2013年CIMAC大会上发表。论文的版权归CIMAC所有。 In order to develop and research the Intelligent fuzzy self-tuning PID controller, the simulation can not fully show the ever changing characteristics of diesels practical work in nonlinear time-varying. To further validating the design of the fuzzy self-tuning PID controller speed performance used in the electronic governor, The controller must use real diesel engine. Therefore, with the D6114 diesel engine as the control target, take the auto-adjusting load system of Shanghai Chuangxiang Power Supply Equipment Co.Ltd. to adjust the load. Be eqiuipped with machine test on the D6114 diesel engine.Therefore, firstly in the paper design and debug the hardware board; then match the new-designed controller with the real diesel basing on microautobox] in order to verify and improve the speed governing systems control strategy and performance.By no-load start, load mutation assay and steady speed test, being proved the new design of intelligent fuzzy self tuning PID controller is superior to conventional PID controller to the purpose of well meeting the diesel engine speed control requirement.

论文已在中国上海举行的2013年CIMAC大会上发表。论文的版权归CIMAC所有。Engine real-time simulation model is necessary component of ECU HIL test system. It provides a good platform for testing the control strategy,control function and reliability of diesel engine ECU.In this paper, real-time simulation model of the electronically controlled common-rail marine diesel engine is built based on physical parameters and experiment parameters. In order to meeting realtime ability and accuracy of HIL simulation test system, other parts of diesel engine are used mean value model with high real-time, except combustion models are used nonlinear Chmela models with high precision . The paper introduces the compositions of diesel engine and expands modeling method of marine diesel engine key compositions, which including air path system, fuel system, combustion system and crankshaft system.Finally, it verifies the accuracy and real-time ability of the model by the simulation results such as common rail pressure, injection mass, effective torque compared with the steady state experiment results on different running condition of diesel engine. So it indicates that the simulated model of building and simulated calculate measure are right and feasible

论文已在中国上海举行的2013年CIMAC大会上发表。论文的版权归CIMAC所有。 The Augment HighPressure CommonRail System (AHPCRS) was designed for the target of improving the performance of high-power diesel engine’s power and reducing the emission. In this paper, the performance of Electric Control Pressure Amplifier (ECPA) which based on the principle of the triple valve was the key part of AHPCSRS was designed, and then simulation studies were completed,the single-power single-switch chopper drive circuit was designed for the ECPA, the Single Chip Microcomputer (SCM) hardware system was designed, the control code of SCM was compiled and the LabVIEW program was compiled. Furthermore, the test-bed was established too. The index marks of system which was investigated including pressurization performance, adjustable of injection rate and the influence caused by the pressure ratio. The simulation results indicated that the ECPA pressure could be 172MPa in the duration of the injection and it could eliminate the pressure oscillation, the adjustable injection rate was more favorable to meet the requirement of diesel engine optimization operate during the whole state. The validation test of system matching with single cylinder diesel was finished. The results indicated that the AHPCRS could realize diesel engine stable operating and emissions could be reduced largely.

论文已在中国上海举行的2013年CIMAC大会上发表。论文的版权归CIMAC所有。Taking a high power density (HPD) diesel engine as a research object, the performance of heat transfer of cylinder head is analyzed in theory and heat transfer condition (HTC) influences on temperature field distribution of cylinder head are ascertained by orthogonal experimental designing method. Secondly, a new method of inspecting thermal crack faults inner cylinder head based on temperature parameter variation is put forward. Experimental and numerical results have been proved that when comparing with normal and crack cylinder head, under the same HTC, for thermal resistive crack inner cylinder head, the temperature values near the slit region change obviously. The maximum temperature difference among nodes near the slit region is 5.25K. Finally, according to LM inverse heat conduction problem solving method, reference on surface temperature values on cylinder head, a general program to identify inner HTC of complex object is developed and applied successfully in identifying heat transfer condition on fire-deck of cylinder head. The results are validated by experimental values and error is less than 1%, which meets the practical engineering requirements and will give a theoretic and technical gist for obtaining threedimensional temperature field of cylinder head based on its surface temperature values.

论文已在中国上海举行的2013年CIMAC大会上发表。论文的版权归CIMAC所有。 Laser surface texturing(LST) technology is a new-style cylinder liner surface processing technology for engines, that perfectly combined laser micro-processing technology and traditional cylinder liner mechanical honing technology, and could optimize the tribological performance on the work surface of Friction units. A new LST processing equipment was developed. It applied unique water-cooled laser resonator cavity and frequency doubling technology which can reduce the heat loss of cavity and increase laser output power. A new rotating laser head was designed which ensure auxiliary gas reliable sealing and the light path flow unblocked. By the designing of software and hardware of quick response control system,achieved high precision joint coordination control between single laser pulse and rotary motion of mechanical system. Maximally reduce the thermal effects side effects by laser microprocessing and improve quality and efficiency of micro-machining. It found that laser honing process could not only obtain the micro surface texturing which enhance lubrication status, but also strengthen the surface hardness. The results of speedy lubrication and wear test indicated that the friction coefficient of the surface texturing sample can reduced by 30% -50% compared with the non-texturing sample, and the wear of the sample surface has also been effectively improved. A mixed lubrication theoretical model was established on cylinder liner-piston ring (CLPR) of diesel. The model was calculated to reveal the influence of LST on tribology performance with barrel-shaped ring. The results show that after the LST, the lubrication and friction performance of the cylinder was improved, the effect of dimple is superior to the groove texturing, the minimum oil ratio in the middle regions of the strokes increased by 29%,while the friction peak decreased about 30%. At last,the engine bench test found that after the surface texture cylinder liner, the engine cylinder fuel consumption engine, the effect is improved most significant at a low speed, the maximum rate of fuel consumption reduced 9.8g/k W • h, a decline of 4.62%, which confirmed the surface texture technology is effective for reducing engine friction loss. Meanwhile, the other engine performance indicators also have improved to some extent,air leakage and oil consumption and other parameters have declined, the largest leakage was decresed by 34.6%, and the oil consumption was reduced by 33.8%.

论文已在中国上海举行的2013年CIMAC大会上发表。论文的版权归CIMAC所有。 In the foreseeable future, though the dominating source of power, diesel engines are required to meet the increasingly stringent regulations of energy conservation and ultra-low emission. As the heart of diesel engines, fuel-injection system is the core of various advanced combustion and emission control technologies of differently typed engines.As a consequence, the fuel-injection system tends to be with higher injection pressure and be flexible as well as controllable, and of which the electronic control high pressure common rail is considered to be the most potential fuel system. The common-rail fuel injection system marked FCRS that is developed by The Wuxi Fuel Injection Equipment Institute which belongs to The China FAW Group Corporation can provide a injection pressure of 180MPa and achieve stable injection more than 3 times. What’ more, it has already been applied to heavy-duty diesel engines for vehicles and large-sized non-road diesel engines as well. The optimal match between the fuel-injection system and the entire engine is the key in the developing process of diesel engines, which depends on the specifying and collaborative optimizing and matching the properties in the aspects of time and space in order to obtain an effective and reasonable combustion process. Time matching needs to ensure that the fuel injection quantity meet the torque demand for different operating conditions of the diesel engine. In addition, the injection timing needs to be precise, stable and adjustable with the load and the speed, and the fuel injection duration must be appropriate. What’s else, the injection pressure and injection rate should be high enough so that make full use of injection energy to boost the forming and combustion of the gas mixture. The combination property can be improved for the emission of NO x and PM can be controlled by multi-injection and shape control of injection law whose character is quick after slow. Space matching of fuel system is the match between the spray and the space of the combustion chamber, and mixture of fuel and air can realize uniform mixing and complete combustion through a optimization design of point of fall of statical fuel injection line on the wall of combustion chamber. As for two-valve DI diesel engines, limited by the structure and the bulk of the combustion chamber, the influence of space matching on combustion process is more obvious. Based on a serial CFD calculation and high-speed photography in side of the chamber, put forward the design standard for statical fuel injection line distributed in the axial direction with equal proportion and in the circumferential direction with equal air-fuel ratio, which can trace back to the idea that get a better mixture of fuel and air and make sure a equal air-fuel ratio, lack of neither oxygen nor fuel, in any place of the chamber.

论文已在中国上海举行的2013年CIMAC大会上发表。论文的版权归CIMAC所有。Particulate emission from diesel engines is one of the most important pollutants in urban areas.How to reduce the PM emission is becoming a key topic in internal-combustion engine study area. DPF(Diesel particulate filter)is a great way to reduce PM. The article studies on DPF and Burner system’s performance and the technology to let the engine meet China IV emission by using the system. Conclusion: DPF system is high efficient to reduce PM. Using Burner regenerate can avoid many troubles on DPF system considering the high sulfur fuel in China. The DPF and Burner technology have good promise in urban.

论文已在中国上海举行的2013年CIMAC大会上发表。论文的版权归CIMAC所有。 According to a Chinese engine builder’s commission, Shanghai Marine Diesel Engine Research Institute developed a new medium speed marine diesel engine CS21 together with FEV. The engine’s bore diameter is 210mm, with a stroke of 320mm. Its output covers from 1200 to 2070kW with 6 ∼ 9 cylinder inline, which is available for propulsion and Genset. The engine will offer customers high reliability, technical competitive, easy maintenance, low prospective cost, low fuel consumption, as well as meet IMO Tier II regulation. Based on Chinese domestic manufacture and supply, the proven design concepts were adopted and CAE simulations were extensively performed for estimating components and systems in CS21 engine developing process. The compounding of Miller timing, latest turbocharger with high compression ratio and high pressure common rail injection system helps the engine achieve good performance. The prototype engine has accumulated more than 800 hours in operation on the test bench. It’s proven that the development targets have been met.

论文已在中国上海举行的2013年CIMAC大会上发表。论文的版权归CIMAC所有。ABB Turbocharging presented the electro-hydraulic variable valve timing system VCM® during the 2010 CIMAC congress in Bergen. The VCM® has a considerable degree of flexibility, allowing it to be used on diesel and gas engines of different sizes and for different purposes. The system also has the inherent possibility to be customised in such a way that easy integration without major changes to an existing engine design is feasible. After extensive mechanical testing of the full system, including a validation and qualification programme on a small medium speed diesel engine, the possibility of the VCM® improving the performance of a gas engine has been investigated. On performance we found an improvement in fuel consumption and other engine parameters. The control unit in a conventional high speed pre-mix gas engine consists of a throttle valve and a compressor by pass. Both consume a substantial amount of energy as they provide a pressure reserve for acceleration and control purposes. One concept by which the performance of such an engine could improve is to substitute these control devices with variable inlet valve timing and lift, i.e. the application of VCM®.This paper shows the design of the VCM® unit for a high speed gas engine where the mechanical boundary conditions are discussed, how these could be fulfilled and how they are influencing the performance of the engine with regard to how the engine reacts to certain variations in the system. With regard to thermodynamic performance, the paper considers possible improvements brought by de-throttling and how the engine operates in normal conditions as well as during load changes. The application of skip-firing/ cylinder cut-off is also discussed. Furthermore, the paper looks at the required set-up of the inlet valve under changing ambient conditions as well as changing gas qualities and applications with variable engine speed.

论文已在中国上海举行的2013年CIMAC大会上发表。论文的版权归CIMAC所有。 As a result of the drastic lowering of sulphur content in HFO or the introduction of LNG fuel,the basicity of future generation Marine Cylinder Lubricants should be decreased provided a high level of neutralization efficiency can be maintained. The efficiency of the neutralization reaction will be a key parameter if specific engine operating modes and future engine designs are more likely to produce acids and therefore more sensitive to corrosive wear. Such protection can be delivered by using innovative ashfree neutralising chemistries to replace the traditional CaCO3 which has been shown to be a poor neutralising agent and prone to generate hard deposits during oil degradation. With the objective to differentiate and quantify this basicity efficient and further to the publication of the Efficient BASicity (EB- AS) concept (ISME2011, paper 528) , we have developed an analytical method, derived from ASTM D4739. The chemical background to this method is described, as well as experimental details, such as repeatability, reproducibility, selectivity and discriminating ability. EBAS is complementary to BN (ASTM D-2896), therefore the two values should qualify the neutralization capability of a finished lubricant. We also report on our in service experience with such methods and our efforts to correlate them with engine reliability. Monitoring 2-stroke engines in service is the way to correlate and couple EBAS/BN with Fe content of drain oils, or to other indicators of engine condition such as the position in the viscosity-basicity diagram (ISME 2011, paper 529) .