Abstract
The capacity trend and characteristics of the torque converter (TC) are the basis for ensuring that a power reflux hydrodynamic transmission system (PRHTS) is well matched to the engine it is paired with. This paper proposes a design method for matching a PRHTS with a given engine. First, using the working principles of the PRHTS, the influence of a TC with different capacity trends on matching is analyzed, revealing that an impervious capacity-trend TC can ensure good matching performance. Then, by considering the working characteristics of a capacity adjustment device that can change the capacity coefficient of the PRHTS, a method for obtaining the range of TC capacity coefficient values is proposed. This method determines the range of TC capacity coefficients by finding the speed ratio and capacity coefficient that matches the maximum torque and optimal operating points of the engine. After adopting the matching design method proposed in this paper and upon comparison with the traditional hydrodynamic transmission system, the PRHTS is noted to improve the matching performance as well as the dynamic and economic performance of the wheel loader.
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