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Rathi, Hemantkumar
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Optimum positioning of FIP drive system for Type-II BSVI engine based on coupled 1d “Valve-train – Chain drive” Dynamic analysis

VE Commercial Vehicles, Ltd.-Kaarthic Kaundabalaraman, Hemantkumar Rathi, Jasvir Singh Bisht
  • Technical Paper
  • 2020-01-1020
To be published on 2020-04-14 by SAE International in United States
The automotive industry is gearing up to meet the accelerated emission compliance changes posed by the government. This transition to eco-friendly system would also necessitate an automotive engineer to retain the engine packaging as compact and simple as possible. The packaging layout considered should not be at the expense of deteriorating engine performance. The work started with concept level layout development, with the aim of having simplified system with minimum number of components. The engine on which the work was carried out was 4cylinder 3Liter with OHC configuration A number of layouts were developed which included gear type, belt drive and integrated shaft arrangement for driving FIP. Each of these concepts were brainstormed with cons and pros, based on which two concepts were initially proposed for driving FIP system (i) Front Driven FIP (ii) Rear Driven FIP. The difference between the two layouts was that in the latter case the FIP system was directly driven through Exhaust Camshaft with gear type arrangement. For the above two proposed layouts, dynamic evaluation was done up-to Max intermittent…
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Piston Bowl Design Optimization to Improve Low Load Torque in BS-VI Diesel Engine based on Multi-dimensional Combustion Simulation

VE Commercial Vehicles, Ltd.-Anish Appukuttan, Jasvir Bisht, Kaarthic Kaundabalaraman, Hemantkumar Rathi
  • Technical Paper
  • 2020-01-0241
To be published on 2020-04-14 by SAE International in United States
In cylinder combustion and emission characteristics are dependent on piston bowl geometry design. Properties like local AF ratio inside the cylinder, in-cylinder fuel air mixing and flame front movement are influenced by piston bowl shape and design. These properties in turns affect the combustion behaviour and the power developed by the diesel engine. In this study piston bowl geometry optimization of a LMD diesel engine is carried out to improve the torque and BSFC output at low to rated operating zones. The optimized bowl geometry is also incorporated in the engine and validated on the test bed. In this work, commercially available CFD code AVL FIRE is used for combustion simulation and bowl geometry optimization. The validation of in-cylinder combustion simulation of a 2L Turbocharged LMD BS-VI diesel engine with base piston bowl geometry is carried out with the available test data. The validation of combustion simulation is performed for four engine operating speed points covering rated torque to rated power operating condition. Four key piston bowl geometry parameters were selected for the optimization study…
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Design Analysis & Parametric Optimization of Gerotor Oil Pump for Improving Volumetric Efficiency

VE Commercial Vehicles Ltd.-Anurag Kamal, Kaarthic Kaundabalaraman, Hemantkumar Rathi, Alok Muley
Published 2016-02-01 by SAE International in United States
This work is an effort to find the parallelism between the volumetric efficiency of a Gerotor, and its inherent design parameters: number of teeth, tooth profile, outer dimensions of diameter and thickness, and the input power (torque and speed). The preliminary relations are derived from the software simulation of a range of Gerotor models with varying aforementioned parameters. These results are augmented by a previously proposed method of theoretically estimating the displacement of a Gerotor. Then, these results are validated and revised by practical results from three different Gerotors with epitrochoidal and its conjugate profiles, which are used in automotive applications like engines and transmissions. These relations can be used for choosing parameters yielding the maximum efficiency in specific environments: the packaging space, the input available, and the output required. Finally, an attempt has been made to develop a theoretical formula of the efficiency of a Gerotor in light of the above parameters. According to these results, a prototype Gerotor is proposed and will be validated for its performance.
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Design Optimization of Powertrain Mounts for Vibration Isolation on Heavy Commercial Vehicle (HCV) Six Cylinder Inline Diesel Engine

VE Commercial Vehicles, Ltd.-Gaurav Paliwal, Naveen Sukumar, Umashanker Gupta, Saurav Roy, Hemantkumar Rathi
Published 2015-01-14 by SAE International in United States
The main emphasis for a commercial vehicle design which was focused on fuel-economy and durability does not fulfill the increasing customer expectations anymore.Commercial vehicle designers need to focus on other vehicle aspects such as steering, ride comfort, NVH, braking, ergonomics and aesthetics in order to provide car like perception to truck, bus drivers and passengers during long distance drives.Powertrain mounting system must perform many functions. First and foremost, the mounting system must maintain & control the overall motion of the powertrain, to restrict its envelope reasonably, thereby avoiding damage to any vehicle component from the potential impact. This requires the mount to be stiff.Second the mount must provide good vibration isolation to have a comfortable ride to the vehicle occupant. This requires the mount to be soft.These requirements contradict each other & hence a suitable “Tradeoff” is needed for achieving the rigid body mode targets for a comfortable vehicle ride and also restraining the powertrain motions within vehicle packaging constraints.
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