Tire Warmup Relation to Rolling Resistance: Understanding how rolling resistance affects and is affected by tire temperature in realistic driving scenario

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dc.contributor.authorKolekar, Abhishek Amit
dc.contributor.authorMadhuravasal Narasimhan, Vivekanandan
dc.contributor.departmentChalmers tekniska högskola / Institutionen för mekanik och maritima vetenskapersv
dc.contributor.departmentChalmers University of Technology / Department of Mechanics and Maritime Sciencesen
dc.contributor.examinerJacobson, Bengt
dc.contributor.supervisorEmvin, Carl
dc.contributor.supervisorHobeika, Teddy
dc.contributor.supervisorLindquist Holmberg, Johan
dc.date.accessioned2024-07-08T13:05:58Z
dc.date.available2024-07-08T13:05:58Z
dc.date.issued2024
dc.date.submitted
dc.description.abstractThe automotive sector is committed to advancing energy efficiency by providing customers with sustainable transportation solutions. With the increasing adoption of electric vehicles with high powertrain efficiency but limited range, reducing other forms of losses, such as rolling resistance, is important. Rolling Resistance (RR) typically contributes around 25% of the energy loss in Electric Vehicles (EVs) [1]. The current measurement of the tire’s rolling resistance is obtained at steady state, which rarely occurs in real-world driving conditions that involve frequent starts and stops, preventing the tire from reaching a steady state equilibrium. This thesis focuses on the effect of warmup on the rolling resistance of tires differing only by their aspect ratios, focusing on measuring and calculating rolling resistance under realistic conditions. The variation of the tire temperature and rolling resistance is measured during both the warmup (transient) and the steady state on the tire test rig by varying the inflation pressure, speed, and normal load for different tires. The rolling resistance showed a negative correlation with the inflation pressure, a positive correlation with the speed, and no correlation to the load. Using the data obtained in the warmup region, a rolling resistance model is created that uses temperature and speed as inputs to calculate the instantaneous rolling resistance. A thermal tire model is also developed that can predict the internal temperature of the tire based on the rolling resistance and speed. Using drive cycle tests, the models were validated, and it was observed that the rolling resistance of the tires varied dramatically through the cycle and rarely matched the ISO standard rolling resistance value. Depending on the tire, it was found that the transient rolling resistance was 25-30% higher before reaching a steady state value. Data from the drive cycle test was used to calculate the rolling energy loss using both the ISO standard rolling resistance coefficient & the rolling resistance model developed. It was found that the rolling energy loss can vary from 6 to 22% between the two approaches, which provides a better understanding of the transient behavior of rolling resistance with respect to a complex drive cycle. This enables better insights into the contribution of rolling resistance to the overall energy loss, and the tire selection process can be made more effective.
dc.identifier.coursecodeMMSX30
dc.identifier.urihttp://hdl.handle.net/20.500.12380/308262
dc.language.isoeng
dc.setspec.uppsokTechnology
dc.subjectrolling resistance
dc.subjecttire warmup
dc.subjectmodeling
dc.subjecttransient rolling energy loss
dc.titleTire Warmup Relation to Rolling Resistance: Understanding how rolling resistance affects and is affected by tire temperature in realistic driving scenario
dc.type.degreeExamensarbete för masterexamensv
dc.type.degreeMaster's Thesisen
dc.type.uppsokH
local.programmeMobility engineering (MPMOB), MSc
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