Effects of oxygenated fuel blends on carbonaceous particulate composition and particle size distributions from a stationary diesel engine
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Oxygenate
Ultra-low-sulfur diesel
Common rail
Development of Common Rail System and Performance Researching of Electronic-Controlled Diesel Engine
The electronic-controlled high-pressure common rail system of 6114B diesel engine was presented.Its working principle,performance parameters and key points were studied in detail.The electronic-controlled system was calibrated on the EFS test rig.The identity of injectors was investigated and the difference of injectors could be compensated by software.The control strategy of the common rail system and the matching test of electronic-controlled diesel engine were also studied in this paper.The results show that the all performances of diesel engine with common rail system are better than the diesel engine with in-line pump.
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본 논문은 카놀라 바이오디젤 혼합연료를 승용디젤엔진에 적용하였을 때 나타나는 연소 및 배기배출물 특성에 관한 연구이다. 본 연구에서는 카놀라 바이오디젤을 20%, 40%를 ULSD 80%, 60%와 체적비로 혼합한 혼합연료를 사용하여 ULSD 결과 데이터와 비교하였다. 엔진 회전속도, 엔진부하, 연료분사압력 변화를 실험변수로 사용하였으며. 카놀라 바이오 디젤의 혼합비가 증가 할수록 NOx 배출량은 증가하였지만, Soot 배출량은 감소하는 결과를 나타내었다. 또한 Soot 배출량은 낮은 연료분사압력에서 높은 배출량을 보였다. This paper describes the effect of canola biodiesel blended fuel on the combustion and emission characteristics in a four cylinder CRDI(Common-rail direct injection) diesel engine. In this study, using the biodiesel fuel(20%,40% of biodiesel-canola oil and 80%, 60% of ULSD(ultra low sulfur diesel) by volume ratio with change of engine speed and injection pressure. The experiment results of increasing biodiesel ratio fuel show that NOx emissions increased. However, soot emission were reduced BC fuels compared to ULSD. Soot emissions largely increased at low injection pressure.
Ultra-low-sulfur diesel
Common rail
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Ultra-low-sulfur diesel
Lubricity
Naturally aspirated engine
Thermal efficiency
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Oxygenate
Ultra-low-sulfur diesel
Common rail
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Based on starting characteristic of traditional diesel engine, the starting demands of electronic controlled diesel engine are analyzed. The starting control logic in the electronic controlled diesel engine is established with the help of electronic control unit in high pressure common rail. The fuel quality supplied during starting process is calculated by MAP method, and its adjustment is made with the ramp function. Finally, the starting control system in high pressure common rail diesel engine is designed.
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Electronic control unit
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Hardware-in-the-loop validation system of control strategies of common rail direct injection marine diesel engine was established, where control oriented cylinder-by-cylinder engine model (CCEM) was used. Simulation results show that CCEM is applicable to validate the control strategy of engine control system, and comparison between simulation results and test bench data approved the accuracy and real-time ability of the system, and electronically controlled common rail system can better the performance of marine diesel engine operation greatly.
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Test bench
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In order to improve marine engineer's operation skill of electronically controlled marine high pressure common rail diesel engine efficiently and to master its technical regulation and working principle,a control simulation system of the engine has been developed.The simulation system is based on the diesel engine's mathematical model,and the computer simulation technology is applied to establish the operational simulation model of the diesel engine.Also CAN bus is applied to construct the hardware system,and then VB 6.0 is used to realize the system.The system has been put into students' training with requested precision,which has laid a solid foundation for the simulation on the electronically controlled high pressure common rail diesel engine.
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Two-stroke engine
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The study investigated the prospect of Macadamia biodiesel as a sustainable and alternative fuel for diesel engine in the transport sector in Australia. The crude vegetable oil is converted to biodiesel by the transesterification reaction with potassium methoxide as a catalyst at 60 °C for one hour. The fatty acid composition and fuel properties of the converted biodiesel are tested under the ASTM and EN standards and compared those with the properties of Ultra-low Sulphur diesel (ULSD). A 4 cylinder, four strokes, DI diesel engine performance and emission characteristics were studied using B5 (5% biodiesel + 95% ULSD by vol.) and B20 (20% biodiesel + 80% ULSD by vol.) blends. The experiment was conducted at full load condition by varying engine speed from 1200 rpm to 2400 rpm. The study examined the brake specific fuel consumption (BSFC) and brake thermal efficiency (BTE) as engine performance parameters and CO, CO2, HC, PM, NOx, and EGT as emission parameters and compared these with results of ULSD. The study found minimum BSFC and maximum BTE at 1600 rpm engine speed. The result reveals that Macadamia biodiesel has higher BSFC, about 5% (B5) to 10% (B20) and lower BTE, about 4.5% (B5) to 6.8% (B20) throughout the range of engine speed. Significant reduction in CO, HC, and PM emissions were found. More specifically, an average reduction of 26% (B5) to 40% (B20) in CO; about 9% (B5) to 31% (B20) in HC; 15% (B5) to 33% (B20) in PM emission were found compared to ULSD. However, the higher EGT of the biodiesel blends increases NOx emission, about 21% to 27% compared to ULSD. Further study on tribological characteristics of Macadamia biodiesel is recommended before any commercial application can be made.
Ultra-low-sulfur diesel
Thermal efficiency
Naturally aspirated engine
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Based on diesel engine equipped with common rail, the multi-injection strategies common rail diesel engine test bed is established with NI test system. In this test bed, the influences of optimized multi-injection strategies to diesel engine performances are studied. The test results show that by using multi-injection strategies, the diesel engine exhaust temperature can reduce 50°C, and noises can reduce 15dB, and emission improve obviously.
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This paper introduces the application of self-developed common rail system on CA4DC diesel engine.With the original engine configuration of inlet pipe and combustion chamber,using nozzle of 6 holes and 0.14 mm diameter,through detailed control system calibration,engine full and part load performance tests show that it meets stage 3 emission regulation.
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