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K, Rakesh
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Study of Handling Behavior of a Passenger Vehicle after addition of CNG Tank

Maruti Suzuki India, Ltd.-Lakshmi Narasimha Varma Jelli, Raghav Budhiraja, Akash Goel, Deepak Bakshi, Rakesh K
  • Technical Paper
  • 2019-28-2405
To be published on 2019-11-21 by SAE International in United States
Objective The objective of this paper is to achieve a comparable handling performance from a vehicle fitted with a CNG tank to that of its gasoline counterpart. A validated CarSim model is run through standard handling evaluation tests before and after the addition of CNG tank. The simulation results are used to compare the handling characteristics of the CNG vehicle with the Base vehicle. Further these results are used to tune the suspension parameters to find an optimum set-up for the actual CNG vehicle. The final parameters are then evaluated in the actual vehicle to verify the study. Methodology A mix of Actual Mule vehicle testing backed by quik Car Sim Model. Full car model is first developed using CarSim by using the parameters of the actual base gasoline vehicle. The modeled vehicle is then tested for standard handling maneuvers such Double Lane Change, Constant Radius Constant Speed and Pulse Input. Further the actual vehicle is run through the exact same tests with the same inputs. The results are used to fine tune the CarSim…
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Evaluating the Effect of Light Weighting Through Roll Stiffness Change on Vehicle Maneuverability and Stability

Maruti Suzuki India, Ltd.-Eric Pranesh Reuben, Raghav Budhiraja, Sreeraj N, Rakesh K, Amardeep Singh
  • Technical Paper
  • 2019-28-2406
To be published on 2019-11-21 by SAE International in United States
Objective To achieve better fuel economy and reduced carbon footprint, OEMs are reducing the sprung and unsprung mass. This translates into a reduction in stiffness which profoundly deteriorates the handling/road holding characteristics of the vehicle. To model these changes in stiffness, modifications are made to suspension roll stiffness at the front and rear. This study compares different configurations of roll stiffness and evaluates vehicle behavior using frequency response characteristics and phase change of Yaw Gain recorded. The present work associates acquired data with subjective feedback to outline the shift in vehicle balance emerging from a variation of sprung and unsprung mass ratio. Methodology To study the frequency response characteristics of the vehicle, the pulse input is chosen for this. An ideal pulse input’s Fourier transform represents constant amplitude over all the frequency ranges. By giving a single input, the system is subjected to a range of frequencies. The changes in roll stiffness at the front and rear axles are achieved through addition of Stabilizer Bars of different diameters and stiffness. The test is conducted using…