【作者】 许回江；

【导师】 潘志翔；

【作者基本信息】 武汉理工大学 ， 轮机工程， 2007， 硕士

【摘要】 随着排放法规的日趋严格和世界能源的日益短缺，节能、高效与环保成为内燃机技术发展的主导方向。而计算机软、硬件技术的飞速发展，使得电子技术被更加广泛地用于发动机的监控系统中。电控喷油技术、相继增压技术、可变喷嘴涡轮增压技术等在发动机上的成功应用，极大地改善了发动机性能。而传统内燃机配气相位固定不变的弊端日益凸现，取消凸轮轴及其从动件，实现发动机气门的开启定时、持续时间和升程等的全可变气门技术更显现其重要性。电液驱动可变气门系统作为一种较为理想的可变气门系统，它可以使得配气机构的运动与柴油机运行工况相互独立，在较大范围内实现气门正时、气门开启持续期和升程的灵活控制，实现发动机低油耗、低排放和高效率的控制目标。国外在可变气门系统的设计和控制方面已做了大量研究，但由于仍存在许多问题尚未解决，有关研究工作还在进行之中，要实现产品化尚需时日。本论文在参阅文献和借鉴国内外设计开发经验的基础上，结合我校在电控气门系统方面的研究成果，采用模型分析、仿真设计与试验研究相结合的研究模式。针对200型柴油机配气系统的特点，开发了一套单作用弹簧复位电-液驱动可变气门系统，并在我校自行研制的柴油机电子—液压控制系统试验台上进行了较为系统和深入的试验研究。最后，根据200型柴油机的运行工况特点，对该可变气门系统的适应性进行了分析，取得了一定成果，但也发现了其中存在的问题，如变工况下，气门开启响应和重叠角的控制问题等。由于电-液驱动气门系统所固有的响应特性，使得进气门开启速度和排气门的关闭速度仅仅从共轨压力、控制定时的角度较难解决，因此对原有的驱动系统在原理和结构上做了一些改进，但限于时间，只能从理论上予以分析，进一步的试验研究只能留待以后。更多还原

【Abstract】 Accompanying with the gradually stricting of emission control regulations and the increasingly scarce of the world’s energy, efficient, economical and environment protection become predominant direction of the I.C. engine technique’s development .And the rapidly developing of the computer’s software and hardware technic, it makes the electronic technique be widely used on the supervision system of engine .The electrical controlled injection fuel technique, STC(sequential turbocharging compression) technique and variable turbo nozzle technique etc. are successfully applied on engine, these consumedly improved its performance .But the traditional I.C. engine’s disadvantage working together with the fixed constant valve phase is increasingly outstand, throwing off camshaft and its accessorial parts, fulfilling valve opening timing, opening continuance time and valve lift’s variable. This type whole variable valve technique is more present its importance.Electronics-hydraulic driving variable valve system ,as a promising camless valve train ,depending on it can completely eliminate the cam-crank shaft mechanical linkage, allowing for a wide continuously variable valve timing, opening continuance time and valve lift .Through the use of variable valve timing(VVT), engine operation can be optimized in fuel economy, performance and emissions .Abroad, vast researches have been made in the area of electronics—hydraulic pressure driving variable valve system at structure design and control strategies ,but still being continuing due to some problems to deal with. It is far away from production.This paper based on the cultural heritage of the design and development experience from domestic to international at the variable valve system, combined my school’s research result of the electronic control valve system,model analysis, simulating design and experiment research are combined together in research process .Aiming to 200 type diesel engines valve system, developed a set of single function, spring restoration, electronics-hydraulic driving variable valve system, and experience be done on the test-bed of the diesel engine electronics—hydraulic driving control system ,which is researched and manufactured by ourself. And according to work movement condition characteristics of 200 type diesel engine, analysing this variable valve system’s controllable, obtaining some results. But some problems also be discovered, for example, corresponding to different rotate speed, controlling of valve lap over angle.Because the proper respond characteristic of electricity- liquid drive valve system, makes the open speed of inlet valve and close speed of exhaust valve are more difficult to solve from the aspect of the common rail pressure and timing control, so I did some improvement at system design towards originally system, but be limited by time, I can stay to do further research and developments for future only.更多还原