Right Shifting for Fuel Economy

Rovai, Fernando Fusco

doi:10.4271/2019-36-0095

Cited by 1 publication

(2 citation statements)

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“…The plotted points demonstrate that engine is not used in its best efficiency on these drive cycles. As studied and demonstrated by Rovai [5], the best in-cycle fuel economy is achieved operating the engine in its best efficiency during accelerations (higher torque) but on lower engine speeds and efficiency during cruise and lower torque conditions.…”

Section: Figure 1 Simulated Drive Cycles Comparisonmentioning

confidence: 93%

“…Vehicle speed per gear ratio and engine speed Gear shift strategy is a very significant variable for fuel consumption. The simulated shift strategy follows the gear shift indicator (GSI), studied by Rovai [5], and extended to 6 th gear in this study, as shown in Figure 4. Despite the standard defined shift points of NEDC, the optimized GSI shift strategy was considered even on NEDC simulated cycle in this study in order to compare the four drive cycles in its best vehicle efficiency.…”

Section: Table 1 Vehicle Drag Coefficientsmentioning

confidence: 99%

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Impacto do powertrain e das condições de dirigibilidade em economia de combustível

Rovai¹

2021

Blucher Engineering Proceedings

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Energy management and vehicle fuel economy are important automotive development drivers besides ambient emissions. Many technologies and solutions are being proposed, compared and improved. Any solution demands expensive resources to be tested and sometimes even the most accurate experimental arrangement is not enough to prove its effectiveness. In this scenario numerical simulation represents an important and reliable tool to make sure even very small improvements, very difficult to be measured, could be honestly compared. Considering that a vehicular solution could be more efficient depending on drive cycle this paper compares, by numerical simulations, the impact of vehicle powertrain plus driving conditions on a passenger car fuel economy. From powertrain side different transmissions, manual (5 and 6 speed) and automatic (6 speed: dual clutch, torque converter and CVT), are compared. From driving conditions side different test cycles (FTP75, HWY, NEDC and WLTC) and vehicle loads (unloaded 1000 kg vehicle and loaded 1500 kg vehicle) are compared.

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Section: Figure 1 Simulated Drive Cycles Comparisonmentioning

confidence: 93%

Section: Table 1 Vehicle Drag Coefficientsmentioning

confidence: 99%