Shift quality of tractors fitted with hydrostatic power split CVT during starting

Wang, Guangming; Song, Yue; Wang, Jiabo; Xiao, Maohua; Cao, Yunlian; Chen, Wanqiang; Wang, Jinxing

doi:10.1016/j.biosystemseng.2020.06.001

Cited by 22 publications

(11 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where the subscripts aI, bI, CI, Ca, and Cb represent the transmission ratios of the corresponding components of the simplified transmission chain in Figure 3(a); the superscripts a and b represent the corresponding a and b components after simplification of the drive train in Figure 3(a); i 2 and i 3 represent the transmission ratios of the corresponding gear pairs. Thus, the efficiency of the transmission system can be expressed as shown in equations ( 16)- (23). When e ø 0 and i a IC i b IC ø 0, the HMCVT has no circulating power.…”

Section: Analysis Of Efficiency Characteristicsmentioning

confidence: 99%

“…The power characteristics of a tractor are among the main evaluation indexes of operating performance. 23 A tractor is expected to have good traction power and traction efficiency under different operating conditions in order to guarantee the normal operation of the tractor when overcoming resistance. Excellent power performance is also reflected by a high torque ratio and the degrees of speed attenuation of the tractor in the starting state and encountering obstacles.…”

Section: Optimization Of the Hmcvt System Parametersmentioning

confidence: 99%

See 1 more Smart Citation

Optimization of the transmission characteristics of an HMCVT for a high-powered tractor based on an improved NSGA-II algorithm

Zhai

Song

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

The hydro-mechanical continuously variable transmission (HMCVT) is a critical component of the power transmission system in a tractor. However, the complexity of the operating conditions imposes high requirements on the transmission characteristics. To improve the powerful performance and economy of HMCVTs and satisfy the operational demands of high-powered tractors, a new optimization design method for the characteristic parameters of an HMCVT is proposed. First, the characteristics of an HMCVT are modeled, and the influence of the structural parameters on the transmission characteristics is analyzed. Then, HMCVT performance evaluation indexes are formulated. In accordance with the speed regulation of system, power performance, and economy characteristics, a multi-objective optimization mathematical model is established, and an improved fast non-dominated sorting genetic algorithm (INSGA-II) is designed. The introduction of a normal distribution crossover operator (NDX) and an improved adaptive adjustment mutation operator not only ensures the population diversity but also improves the Pareto solution convergence properties during the process of genetic evolution. The superiority of INSGA-II is verified by comparison with a traditional multi-objective genetic algorithm. Finally, the optimization results show that the torque ratio is increased by approximately 2.81%, 14.32%, 2.31%, and 15.07% in HM1, HM2, HM3, and HM4 respectively. The transmission efficiency is increased by approximately 3.48% and 1.97% in HM1 (HM3) and HM2 (HM4). Also, INSGA-II finds the optimal solution with a faster speed and shorter optimization time than MULGA. This research can serve as a reference for the design and optimization of HMCVTs for high-powered tractors.

show abstract

Section: Analysis Of Efficiency Characteristicsmentioning

confidence: 99%

Section: Optimization Of the Hmcvt System Parametersmentioning

confidence: 99%

Optimization of the transmission characteristics of an HMCVT for a high-powered tractor based on an improved NSGA-II algorithm

Zhai

Song

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

show abstract

“…Hydro-mechanical continuously variable transmission (HMCVT) [1][2][3] is highly automated, and its shifting process is completely carried out under its transmission control unit (TCU) [4,5]. The fault of the position clutch or hydraulic control system will have a great impact on its shifting quality [6,7]. Therefore, in order to discover potential faults in time and improve the reliability of the shifting operation, the TCU needs to perform real-time fault monitoring.…”

Section: Introductionmentioning

confidence: 99%

Research on Fault Diagnosis of HMCVT Shift Hydraulic System Based on Optimized BPNN and CNN

Wang

et al. 2023

Agriculture

Self Cite

View full text Add to dashboard Cite

There are some problems in the shifting process of hydraulic CVT, such as irregularity, low stability and high failure rate. In this paper, the BP neural network and convolutional neural network are used for fault diagnosis of the HMCVT hydraulic system. Firstly, through experiments, 120 groups of pressure and flow data under normal and four typical fault modes were obtained and preprocessed; they were divided into 80 groups of training samples and 40 groups of test samples via random extraction, using the BP neural network model and convolutional neural network model for fault classification. The results show that compared with BP, PSO-BP and other models, the fault diagnosis rate of the BAS-BP neural network model can reach 92.5%, and the average diagnosis accuracy rate of the convolutional neural network can reach 97.5%, which can be effectively applied to the fault diagnosis of the HMCVT hydraulic system and provide some reference for the shifting reliability of hydraulic CVT.

show abstract

“…The shuttle shifting belongs to the clutch-to-clutch shifting, that is, changing the power flow by changing the operating states of the clutches to change the vehicle motion [6]. Many studies have been conducted on the process of clutch-toclutch shifting [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Among them, Goetz et al developed a gearshift controller for twin clutch transmissions, and integrated powertrain control strategy for gearshifts is developed [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Kim et al investigated the effects on the shifting performance of the design parameters of a power shuttle tractor by developed models of the hydraulic control system and power shuttle transmission using commercial software EASY5 [20]. Wang et al studied the matching of the control parameters of clutch hydraulic systems in order to improve the shift quality of the tractors fitted with hydrostatic power split continuously variable transmission during starting [21]. Xia et al proposed a power shift control strategy based on torque and speed transition, which aims to deliver multiple target and multi-parameter optimization of power shift control.…”

Section: Introductionmentioning

confidence: 99%

Control Strategy of Shuttle Shifting Process of Agricultural Tractor During Headland Turn

et al. 2023

IEEE Access

View full text Add to dashboard Cite

show abstract

Shift quality of tractors fitted with hydrostatic power split CVT during starting

Cited by 22 publications

References 20 publications

Optimization of the transmission characteristics of an HMCVT for a high-powered tractor based on an improved NSGA-II algorithm

Optimization of the transmission characteristics of an HMCVT for a high-powered tractor based on an improved NSGA-II algorithm

Research on Fault Diagnosis of HMCVT Shift Hydraulic System Based on Optimized BPNN and CNN

Control Strategy of Shuttle Shifting Process of Agricultural Tractor During Headland Turn

Contact Info

Product

Resources

About