Analysis of The Effect of Different Gearbox/Transmission Types on Driveline Friction Losses by Means of Gt Suite Simulation Programme

Abstract

Selection of transmission systems of motor vehicles used on highways is high-ly important in terms of fuel consumption and vehicle efficiency. In this study, effect of using 3 different gearboxes in a passenger car (automatic gearbox, CVT gearbox and manuel gearbox) on driveline friction losses and engine operation interval by means of GT SUITE vehicle modelling programme. The vehicle model formed has been simulated in 3 different driving cycles (WLTP, HFET and US06) and transmission system losses have been compared. In WLTP driving cycle in which speed changes and average speed are low, frictions resulting from the load constitute a significant part of total frictions; on the other hand, in driving cycles in which driving mode is aggressive and the average speed is high, frictions re-sulting from lubricant and sealing elements constitute a significant part of total frictions. Gearbox and related clutch mechanism selection have changed opera-tion interval of the engine during driving cycle.

Keywords

• Driving cycle
• GT SUITE
• transmission losses
• lock-up clutches

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