Abstract
A loader is a construction machine to upload soil into trucks or to transport those materials. As a kind of loaders, a wheel-loader, which is driven by wheels, has been widely used. Since a wheel-loader with an automatic transmission operates in the adverse environments such as constructions sites, the shift quality has not been addressed as a main research topic. However, the necessary for researches to improve the shift quality of automatic transmission raised to develop control technology for operator’s convenience. In this study, a wheel-loader’s power train with an automatic transmission was analytically modeled and then the shift quality was analyzed based on power train modeling. An analytical model of wheel-loader’s power train is verified by comparing experimental and simulated results under the same operational conditions. Since the shift performance is affected by the pressure in clutch piston, current profile of a proportional pressure control valve to control the automatic transmission was varied for the simulation verification. In the simulations, it was analyzed in terms of shift performance in each stage of fast filling, take-over and clutch slippage, and clutch slippage time. Finally, relative amplitude of jerk is used in order to decide the regular shift performance.
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