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Engine Fuel Economy Optimization for different Hybrid Architectures using 1-D Simulation technique

Tafe Motors and Tractors Limited-Ajay Nain, Devendra Nene
  • Technical Paper
  • 2019-28-2496
To be published on 2019-11-21 by SAE International in United States
In order to improve fuel economy of the 3.3 litre tractor model, various kinds of engine hybridization is studied. This paper presents a methodology to predict engine fuel consumption using 1-D software by coupling Ricardo Wave and Ricardo Ignite. Engine fuel consumption and emission maps are predicted using Ricardo WAVE. These maps are used as an input to IGNITE for predicting cumulative fuel consumption. There is good agreement within 10% deviation between simulated cumulative fuel consumption and experimental cumulative fuel consumption. Same calibrated model is used further for studying series hybridization, parallel P1 type and Parallel P2 type of hybridization. A design of experiment (DOE) model is run for different electric motor sizes, battery capacity and battery state of charge condition, to understand their effects on overall engine fuel consumption and cycle soot emission. Model predicts overall significant reduction in cumulative fuel consumption and soot emission. Lower soot emission will leads to smaller exhaust after-treatment size. There is trade-off between higher cost due to hybridization and lower cost due to lower after-treatment size. A cost…
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Noise and vibration simulations method for electric hybrid tractor powertrain.

Tafe Motors and Tractors Limited-Ishwinder Pal Singh Sethi, Anand Shivajirao Patil
  • Technical Paper
  • 2019-28-2469
To be published on 2019-11-21 by SAE International in United States
Internal combustion (IC) engines have been serving as prime source of power in tractors, since late 19th Century. Over this period, there have been significant improvements in IC engine technology leading to increased power density, reduction in tailpipe emissions and refinement in powertrain noise of tractors. As the regulations governing tailpipe emissions continue to be more stringent, original equipment manufacturers also have initiated work on innovative approaches such as diesel-electric hybrid powertrains to ensure compliance with new norms. However, introduction of such technologies may impact customer’s auditory, vibratory and drivability perceptions. Absence of conventional IC engine noise, association of electric whistle and whine, torque changes with activation/de-activation of motors and transmission behavior under transient conditions may result in new NVH issues in hybrid electric vehicles. The following paper addresses these concerns and introduces a multi-physics simulation model to investigate and mitigate these effects. The multi physics simulation model presented in this paper incorporates the multi-disciplinary domain of internal combustion engine thermodynamics, electric components, mechanical systems, control systems and the vehicle response.
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Effect of Eccentric imbalance of various crank train components on Vibrations in single cylinder Diesel Engines

Tafe Motors and Tractors Limited-Puneet julaha, Vasundhara Arde, Remesan Chirakkal
  • Technical Paper
  • 2019-28-2417
To be published on 2019-11-21 by SAE International in United States
A Vibration analysis is about the art of looking for changes in the vibration pattern and then relating those changes. Vibration generates from Excitation forces due to firing, structural properties like stiffness of the engine and dynamic response. The unbalance masses percentage variation will effect on increasing in Vibration of the diesel engine with respect to Change in Speed. Inherent vibration in engine cause due to combustion is depend upon various crank mechanism, fuel or air flow, gear wheels ,unbalanced turbocharger,etc.. Individual balancing of parts and its combined effect after assembly will totally change the scenario of vibration .Shifting of vibration pattern from Lateral to Vertical plays significant role in this. Changing an eccentric mass direction gives harmonic impact in vibration. Changes in acceleration/displacement pattern with different percentage of balancing. This case study helps to understand the effect of location of eccentric mass on crank-train components on overall vibration behavior of an engine. Effect of change in force direction on vibration behavior of engine. Eccentric unknown mass and its change in phase angle of that…
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Design and Development of Constant speed diesel engine up to 20 bar BMEP with Inline FIS

Tafe Motors and Tractors Limited-Omprakash Yadav, Piyush Ranjan, Vishal kumar, Vasundhara Arde, Sanjay Aurora, Remesan Chirakkal
  • Technical Paper
  • 2019-28-2549
To be published on 2019-11-21 by SAE International in United States
Design and Development of Constant speed diesel engine up to 20 bar BMEP with Inline FIS Remesan CB, Sanjay Aurora, Vasundhara V Arde, Vishal Kumar, Om Prakash Yadav, Piyush Ranjan Eicher Engines (A unit of TAFE Motors & Tractors Ltd.) Abstract Development trend in diesel engine is to achieve more power from same size of engine. With increase in brake mean effective pressure (BMEP), the peak firing pressure will also increase. The methodology to control the peak firing pressure on higher BMEP is the major challenge. We achieved better SFC with CPCB II emission targets on a constant speed engine. This study involves a systematic approach to optimize combustion parameters with a cost effective and robust inline Fuel Injection System. This paper deals with the strategies applied and experimental results for achieving the power density of 25kW/lit with Inline FIP by keeping lower Peak firing pressure. Various combustion parameters such as Combustion Bowl Geometry, selection of Turbocharger, Swirl, FIP, Nozzle configuration, EGR flow rate, EGR operation strategy, optimizing injection pressures, start of injection, end of…
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Engine Valve Train Dynamic Analysis using 1-D Simulation Approach

Tafe Motors and Tractors Limited-Ajay Nain, Devendra Nene
  • Technical Paper
  • 2019-28-2422
To be published on 2019-11-21 by SAE International in United States
In order to reduce engine development timing and cost, a numerical calculation used to evaluate valve train systems. This paper discusses the work done on kinematic and dynamic analysis of Valve Train (VT) system of a diesel engine by using 1-D Ricardo Valdyn software. The goal is to meet optimum intake, exhaust valve timing requirement, maximize valve open area and 20% overspeed requirement. Valve train model is prepared and inputs like mass and stiffness are estimated from actual weighing and finite element approach respectively. Simulation model is used for predicting valve bounce speed, valve displacement, cam-follower contact stress and strain in the rocker arm. Initially, Kinematic analysis is carried out to study the change in valve motion characteristics such as cam contour radius, tappet contact eccentricity etc. Further to this, dynamic analysis is carried out to assess forces and stresses on valve train components. Effect of cam tappet contact stresses, buckling load on push rod, spring surge, ratio of spring force to inertia force, valve seating velocity at increased speed condition etc. are discussed in…
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Engine Exhaust Noise Optimization Using Sobol DoE Sequence and NSGA-II Algorithms

Tafe Motors and Tractors Limited-Ishwinder Pal Singh Sethi, Devendra Nene, Anand Shivajirao Patil
Published 2019-06-05 by SAE International in United States
Exhaust muffler is one of the most important component for overall vehicle noise signature. Optimized design of exhaust system plays a vital role in engine performance as well as auditory comfort. Exhaust orifice noise reduction is often contradicted by increased back pressure and packaging space. The process of arriving at exhaust design, which meets packaging space, back pressure and orifice noise requirements, is often manual and time consuming. Therefore, an automated numerical technique is needed for this multi-objective optimization.In current case study, a tractor exhaust system has been subjected to Design of Experiments (DoE) using Sobol sequencing algorithm and optimized using NSGA-II algorithm. Target design space of the exhaust muffler is identified and modeled considering available packaging constrain. Various exhaust design parameters like; length of internal pipes, location of baffles and perforation etc. are defined as input variables. Performance objective of back pressure and sound pressure level has also been defined in simulations workflow.Exhaust orifice noise has been reduced with significant reduction in overall simulations time. The optimal design is achieved satisfying all constrains leading…
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