Performance Evaluation of Diesel Engine Using Novel Variable Compression Ratio Mechanism

A. J. Chaudhari, Dnyaneshwar Panchal, Shankar Kolekar, Swapnil Kadav, Harshal Moradiya, V. D. Patel
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Abstract

Increasingly stringent emission and fuel economy standards brings opportunities and research in automobile engine technology development to make it more efficient and less polluting. There are various performance improvement strategies adopted by different researchers in order to get maximum power from the minimum quantity of fuel alongside substantial reduction in exhaust gas emission. The techniques such as CRDI (Common Rail Direct Injection), VVT (Variable valve timing) and such more are commercially viable and successfully incorporated in vehicles. Along the similar track, this paper highlights the importance of variable compression ratio diesel engine, method of achieving the variable compression ratio (VCR) as per load and speed conditions. Variable compression ratio (VCR) technology is one of the method for improving the automobile engine performance, efficiency, fuel economy with reduced emission for range of fuels. The basis of the VCR engine is to operate at different compression ratio, by altering the combustion chamber volume, as per need of most suitable operating conditions. Apart from this, the fuel injection location needs to be varied as per load and speed conditions. The synchronization of both VCR and variable fuel injector location (VFIL) becomes important. Knowing this fact, the study for the diesel Comet engine (3.7 kW@2100 RPM) is undertaken for variable clearance volume accompanied with VIPL. The work consists of design and development of mechanism consisting of auxiliary cylinder and auxiliary piston which will operate in and out of combustion chamber as per load and speed conditions. The detailed drawings and complete experimentation will be carried out to judge the improvement of performance of diesel engine with modification of variable clearance volume concept. The performance parameters consist of brake power, brake thermal efficiency and brake specific fuel consumption under various load conditions.
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采用新型变压缩比机构的柴油机性能评价
日益严格的排放和燃油经济性标准为汽车发动机技术的发展带来了机遇和研究,使其更高效,更少污染。不同的研究人员采用了各种性能改进策略,以便从最少的燃料量中获得最大的功率,同时大幅减少废气排放。CRDI(共轨直喷)、VVT(可变气门正时)等技术在商业上是可行的,并成功地应用于车辆。沿着类似的轨道,本文强调了可变压缩比柴油机的重要性,以及根据负载和速度条件实现可变压缩比的方法。可变压缩比(VCR)技术是提高汽车发动机性能、效率、燃油经济性和减少燃油排放的一种方法。VCR发动机的基础是在不同的压缩比下运行,通过改变燃烧室的体积,根据需要最合适的工作条件。除此之外,燃油喷射位置需要根据负载和速度条件而变化。VCR和可变喷油器位置(VFIL)的同步变得非常重要。了解到这一事实,对柴油彗星发动机(3.7 kW@2100 RPM)进行了可变间隙量伴随VIPL的研究。这项工作包括设计和开发由辅助气缸和辅助活塞组成的机构,该机构将根据负载和速度条件在燃烧室内外工作。将进行详细的图纸和完整的实验,以判断修改变间隙容积概念对柴油机性能的改善。性能参数包括各种负载条件下的制动功率、制动热效率和制动比油耗。
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