Prediction of the performance of a split/circulated power transmission

Jo, Han-Sang; Lim, Wonsik; Park, Y.-I.; Lee, J.-M.

doi:10.1243/0954407991526838

Cited by 6 publications

(4 citation statements)

References 6 publications

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“…Equation (8) shows that the variable factors influencing the basic characteristics of each solution are the structural parameter of the PGT τ and the effective diameter of the TC circuit D. By further analysis, it is found that the efficiency varies strictly monotonically with τ and D. Therefore, the two boundary values for the τ and a specific value for the D are adopted to examine the basic characteristics of each solution. Figure 9 shows the efficiency of each solution.…”

Section: Basic Characteristics Analysismentioning

confidence: 99%

“…Jo et al suggested a new input torque coupled HMPST concept, where the hydraulic elements were placed at both the mechanical and hydraulic branches. To evaluate the usefulness of the designed mechanism relative to a prototype TC (TC), the torque ratio and efficiency for all six schemes were analyzed using the performance locus diagram [8]. Linares et al proposed a thorough methodology for designing a continuously variable power split transmission with several types of power flow suitable for an agricultural tractor.…”

Section: Introductionmentioning

confidence: 99%

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Achievement of Fuel Savings in Wheel Loader by Applying Hydrodynamic Mechanical Power Split Transmissions

et al. 2017

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Abstract:The fuel economy of wheel loaders is deeply affected by the efficiency of their propelling transmissions, however, the torque converter (TC) in existing propelling transmissions is a low-efficiency component and leads to excessive energy consumption. Accordingly, this paper replaces the TC with a hydrodynamic mechanical power split transmission (HMPST) for improving the fuel economy of wheel loader. Based on probability similarity theory, the typical operating mode for the vehicles is constructed, which is used to evaluate the energy consumption performance of the selected solutions. The four reasonable solutions, which can be initially applied to wheel loaders, are selected from among the HMPSTs using the lever diagram. Furthermore, the comparisons on efficiency and loading characteristics between these four solutions and a prototype TC are conducted. The design optimization for all the four solutions is implemented, in order to find the optimal fuel saving solution relative to the prototype TC, and only one solution with pure power split can meet the constraints. Finally, a simulation model of the wheel loader powertrain is established for validating the effectiveness of this optimal solution. The results show that the optimized solution can effectively improve the fuel economy of wheel loaders compared to the prototype TC and provides a novel substitute for current technology.

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Section: Basic Characteristics Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Achievement of Fuel Savings in Wheel Loader by Applying Hydrodynamic Mechanical Power Split Transmissions

et al. 2017

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“…In recent years, hydrodynamic mechanical power-split (HMPS) transmissions have attracted increasing research interest. [4][5][6] The reasons are twofold. First, the torque converter with low efficiency in an HMPS transmission does not need to be loaded with the full input power of the transmission.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of hydrodynamic mechanical power-split transmissions

Liu

Sun

Liu

2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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The objective of this study was to evaluate the performance of 24 basic hydrodynamic mechanical power-split (HMPS) transmission designs effectively based on their torque multiplication capacities (TMCs) and efficiencies. Firstly, four schemes were preliminarily selected. Secondly, the matching between the four schemes and a reference wheel loader was considered, and an expression for the TMC was developed based on the traditional transmission and a second reference transmission. Thirdly, two performance metrics in terms of the TMC and efficiency – the average torque multiplication capacity (ATMC) and average efficiency – were defined to eliminate the couplings of four transmission parameters with the vehicle speed and speed ratio. Finally, the performances of the two best schemes and traditional hydrodynamic mechanical (HM) transmission were carefully compared. The results show that a transmission with power recirculation cannot present energy savings potential regardless of the ATMC, whereas a transmission with a power split can achieve an ATMC of 0.255, an average efficiency increment of 0.0143 in the short loading cycle, and a miniscule efficiency increment in the long loading cycle compared with the HM transmission.

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“…16 In addition, the effectiveness of the optimization model is not validated. Jo et al 17 presented a new input coupled power-split transmission. They analyzed the TR and efficiency of all feasible solutions by the performance trajectory diagrams.…”

Section: Introductionmentioning

confidence: 99%

Multi-objective design optimization of power-cycling hydrodynamic mechanical transmissions

Liu

Sun

Qin

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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The power-cycling hydrodynamic mechanical transmissions have the advantages of continuously adjustable speed ratio and high efficiency compared with the traditional automatic transmissions, so they may be a good substitute for the prior art. For off-highway vehicles which frequently work in low speed and confront great resistance, the zero-speed-ratio torque ratio (TR) of the power-cycling hydrodynamic mechanical transmissions represents the power performance of the vehicles. Furthermore, the complexity of the transmissions is an indispensable consideration for industrial designers. The radial and axial dimensions of the power-cycling hydrodynamic mechanical transmissions are determined by the effective diameter of the torque converter’s circuit and the number of transmissions gears, respectively. In order to optimize the zero-speed-ratio TR and the complexity of the power-cycling hydrodynamic mechanical transmissions, a design methodology is proposed. Considering that there is no explicit mathematical relationship between the design variables and the multi-objective functions, the parametric design and numerical simulation for the torque converter are carried out. The intrinsic mapping between the design variables and the multi-objective functions is fitted by the radial basis function neural network. On this basis, the fast and elitist non-dominated sorting genetic algorithm (NSGA-ΙΙ) is used to solve the multi-objective optimization problem. The numerical simulation for one group of solution selected from the Pareto optimal solutions is conducted. The simulation results indicate that the design methodology proposed in this study is effective. The optimal results show that the zero-speed-ratio TR of the power-cycling hydrodynamic mechanical transmissions is heavily influenced by the radial and axial space of such transmissions. The design optimization helps to find the optimal solutions for the power-cycling HMTs, which are superior to the traditional automatic transmissions and match well the prime mover.

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Prediction of the performance of a split/circulated power transmission

Cited by 6 publications

References 6 publications

Achievement of Fuel Savings in Wheel Loader by Applying Hydrodynamic Mechanical Power Split Transmissions

Achievement of Fuel Savings in Wheel Loader by Applying Hydrodynamic Mechanical Power Split Transmissions

Performance analysis of hydrodynamic mechanical power-split transmissions

Multi-objective design optimization of power-cycling hydrodynamic mechanical transmissions

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