Optimal Clutch Pressure Control in Shifting Process of Automatic Transmission for Heavy-Duty Mining Trucks

Zhang, Heng; Zhao, Xinxin; Sun, Junqiang

doi:10.1155/2020/8618759

Cited by 7 publications

(9 citation statements)

References 26 publications

(24 reference statements)

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“…Another example is the research [33]. Authors applied a linear quadratic regulator (LQR) so as to achieve optimal control pressure of the clutches.…”

Section: ) Local Optimization Methodsmentioning

confidence: 99%

Elastic Damping Mechanism Optimization by Indefinite Lagrange Multipliers

et al. 2021

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The current paper has presented the study on theoretical dependences of the optimization parameter (the degree of transmission transparency) on the design factors of elastic-damping mechanism (EDM) in the transmission for tractors of small traction class (14 kN). The purpose of the study was to obtain a unified functional relationship that integrates early study results. The determination of a unified function was based on reaching a compromise by the method of indefinite Lagrange multipliers. With the help of the function, there have been obtained the dependences of the effect of EDM design factors on transmission processes when performing the main agricultural operations. Using a method based on finding a compromise solution (method of indefinite Lagrange multipliers), there have been substantiated design parameters of the elastic-damping mechanism in the tractor transmission and there has been identified an optimization parameter of the Lagrange function. For a better understanding of the obtained dependence, there has been carried out a three-dimensional visual analysis. Each factor used in the Lagrange function was a physical parameter of an elastic-damping mechanism. The resulting equation has given an opportunity to control mechanism parameters in natural operating conditions. The obtained Lagrange value has demonstrated that the mechanism absorbs 32% of fluctuations in the external traction load of a tractor, when working with the main agricultural tools.

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“…Another example is the research [33]. Authors applied a linear quadratic regulator (LQR) so as to achieve optimal control pressure of the clutches.…”

Section: ) Local Optimization Methodsmentioning

confidence: 99%

Elastic Damping Mechanism Optimization by Indefinite Lagrange Multipliers

et al. 2021

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“…ωis and ˆ. ω i0 can be calculated from Equation (11). Ti0 , which is marked as the equivalent resistance torque estimation of the AMT input shaft, can be obtained.…”

Section: Estimation Methods Of Amt Equivalent Resistance Torque 411 A...mentioning

confidence: 99%

“…Currently, other types of automated transmissions such as automatic transmission (AT), continuously variable transmission (CVT), and double clutch transmission (DCT), still cannot meet the requirements of heavy-duty vehicles. AT has low transmission efficiency and high maintenance costs, thereby increasing operational costs [11][12][13]. CVT has low transmission torque limited by steel belt materials and manufacturing technology, and has been only used in cars [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Parameter Estimation of a Countershaft Brake for Heavy-Duty Vehicles with Automated Mechanical Transmission

2021

Processes

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A countershaft brake is used as a transmission brake (TB) to realize synchronous shifting by reducing the automated mechanical transmission (AMT) input shaft’s speed rapidly. This process is performed to reduce shifting time and improve shifting quality for heavy-duty vehicles equipped with AMT without synchronizer. To improve controlled synchronous shifting, the AMT input shaft’s equivalent resistance torque and the TB’s characteristic parameters are studied. An AMT dynamic model under neutral gear position is analyzed during the synchronous control interval. A dynamic model of the countershaft brake is discussed, and its control flow is given. The parameter identification method of the AMT input shaft’s equivalent resistance torque is given on the basis of the least squares algorithm. The parameter identification of the TB’s characteristic parameters is proposed on the basis of the recursive least squares method (RLSM). Experimental results show that the recursive estimations of the TB’s characteristic parameters under different duty cycles of the TB solenoid valve, including brake torque estimation, estimation accuracy, and braking intensity estimation, can be effectively estimated. The research provides some reliable evidence to further study the synchronous shifting control schedule for heavy-duty vehicles with AMT.

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“…The highpower hydraulic automatic transmission (AT) uses clutches (or brakes) to shift gears, which can ensure shifting without interruption of power and achieve good shifting smoothness; the torque converter (TC) enables greater torque transmission at low speeds; and the application of planetary row structure is reliable when shifting frequently. These three features, which other types of transmissions do not have, make AT widely used in the heavy truck field [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Shift Strategy Optimization for Automatic Transmission of Heavy Trucks Based on Dynamic Programming Algorithm

et al. 2021

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The shift strategy of automatic transmission plays a vital role in the smoothness and economy of heavy-duty mining trucks. In this paper, an engine fuel consumption model, a 6 + 2 speed automatic transmission model, and a vehicle resistance model are built in MATLAB. Combined with the development of smart mining technology, the traditional two-parameter economic shift strategy is corrected based on vehicle load and road slope. The dynamic programming optimization algorithm is used to extract the best economical shift strategy under known working conditions to reduce the fuel consumption and the number of shifts. Finally, simulation experiments of the optimized shift strategy by dynamic programming in a typical mine work cycle are carried out. The simulation results show that the engine speed and output torque are maintained in a relatively stable and efficient working range by using the proposed shift strategy. Compared with the traditional two-parameter shift strategy, dynamic programming has advantages in reducing fuel consumption and shift numbers.

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Optimal Clutch Pressure Control in Shifting Process of Automatic Transmission for Heavy-Duty Mining Trucks

Cited by 7 publications

References 26 publications

Elastic Damping Mechanism Optimization by Indefinite Lagrange Multipliers

Elastic Damping Mechanism Optimization by Indefinite Lagrange Multipliers

Parameter Estimation of a Countershaft Brake for Heavy-Duty Vehicles with Automated Mechanical Transmission

Shift Strategy Optimization for Automatic Transmission of Heavy Trucks Based on Dynamic Programming Algorithm

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