Research on the HMCVT gear shifting smoothness of the four-speed self-propelled cotton picker

Bao, Mingxi; Ni, Xiaomin; Zhao, Xinhui; Shen, Li

doi:10.5194/ms-11-267-2020

Cited by 11 publications

(9 citation statements)

References 15 publications

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“…This paper uses the average efficiency of PEV under all working conditions as the objective function of I-SA algorithm. The objective function f itness is as follows: (11) in which n 1 and n 2 are the number of discrete points for PEV's power in 0~43 kW and in the entire speed range; and η ij is the vehicle efficiency of PEV at the ith power point and jth speed point. The technical route of 'the method of parameter matching and mode division based on I-SA algorithm' is shown in Figure 5.…”

Section: Methods Of Parameter Matching and Mode Switching Strategy Based On I-samentioning

confidence: 99%

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I-SA Algorithm Based Optimization Design and Mode-Switching Strategy for a Novel 3-Axis-Simpson Dual-Motor Coupling Drive System of PEV

Cheng

2021

WEVJ

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Pure electric vehicle (PEV) equipped with a dual-motor coupling drive system can make full use of the high efficiency working range of the motor in order to improve vehicle efficiency. In order to further expand the application range of the system and to improve its practical application, this paper designs and proposes a new dynamic coupling drive system of three axis-double working modes, which is based on the Simpson planetary gear train. The new system adopts two planetary gears (P1 and P2), and the two sun gears of double rows, planetary carrier of P1 and gear ring of P2 are bunded. The power output of the P1 gear ring (mode 1) and P2 planetary carrier (mode 2) is realized by a controlling wet clutch. This paper adopts the linear interpolation method, least square method and 5-fold CV cross validation method to establish the full load speed characteristics and efficiency characteristics models of two motors (13 and 30 kW). This paper proposes an optimization design method based on an improved simulated annealing (I-SA) algorithm for new system parameter matching and working mode switching strategy determination. The results show that the modeling accuracy of the two motors is high, and the mean value of MAPE is 4.337%. The proposed optimization design method achieves the demand goal of PEV effectively. The I-SA algorithm has good effectiveness and fast convergence, the mean efficiency of the optimized PEV is 83.91% under all working conditions, the maximum speed is 142.56 km/h and the power utilization rate of the dual-motor is 100%. This study proposes a new hardware system and a design optimization method on software and provides a direct reference for the research of PEV drive systems by combining hardware with software.

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Section: Methods Of Parameter Matching and Mode Switching Strategy Based On I-samentioning

confidence: 99%

“…This paper refers to the power confluence mechanism [10][11][12] commonly used in the design of hydraulic mechanical power split CVT system [13,14]. The design idea of this type of confluence mechanism is similar to that of the Simpson type planetary gear device.…”

Section: A Novel 3-axis-simpson Dual-motor Coupling Drive Systemmentioning

confidence: 99%

I-SA Algorithm Based Optimization Design and Mode-Switching Strategy for a Novel 3-Axis-Simpson Dual-Motor Coupling Drive System of PEV

Cheng

2021

WEVJ

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“…T 2 = i 12 T 1 (16) where i 12 is the transmission ratio of the gear pairs; n 1 and n 2 are the speeds of the two gears, r/min; and T 1 and T 2 are the torques of the two gears, N•m. The speed and torque between the three basic components of the planetary gear, the sun gear, the ring gear, and the carrier satisfy the following equations:…”

Section: Modeling Of Gears and Shaftsmentioning

confidence: 99%

“…This is currently the mainstream strategy for CVT design, as its shifting logic is very simple. In this research field, Bao et al [16] constructed a clutch control system based on solenoid directional valves and optimized the clutch pressure, the flow, and the displacement ratio of the pump to the motor to improve the shifting quality of the power-split CVT. Chen et al [17] proposed a simulation model of a similar hydraulic control system, making it possible to further study the shifting dynamics of CVT tractors through computer simulation.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Shifting Quality for Hydrostatic Power-Split Transmission with Single Standard Planetary Gear Set

Xu,

Wang,

Yang

et al. 2023

Agriculture

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To improve the driving comfort of continuously variable transmission (CVT) tractors, the shifting quality of hydrostatic power-split transmission with a standard planetary gear set was optimized. Firstly, the powertrain of the CVT and two shift strategies, direct-shift and bridge-shift, were introduced; then, a dynamic model of tractor shifting was constructed, and the models of key components such as wet clutches and proportional pressure valves were experimentally verified. Finally, the control parameters of the above two shifting strategies were optimized, and the acceleration impact and sliding energy loss caused by them were compared. The results showed the following: the minimum peak acceleration of the bridge-shift method was 0.385807 m/s2; the energy consumption of the bridge-shift method was significantly lower than that of the direct-shift method; the sliding friction work of clutches decreased by 14.92% and 75.84%, respectively, while their power loss decreased by 22.82% and 74.48%, respectively.

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“…Currently, most studies on tractors' continuously variable speed transmission focus on the HMCVT (Hydromechanical Continuously Variable Transmission) [12][13][14][15]. However, the HMCVT generally has a large volume compared with the HST, so the HST can better meet the lightweight requirement.…”

Section: Introductionmentioning

confidence: 99%

Research on Load Disturbance Based Variable Speed PID Control and a Novel Denoising Method Based Effect Evaluation of HST for Agricultural Machinery

Cheng

2021

Agriculture

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This paper aims to realize and improve the constant speed control performance of tractors with HST (Hydrostatic Transmission) variable speed units. To achieve this, based on the HST test bench of the tractor, we perform a verification test of the adjustable speed characteristics, a denoising filter test of the response signal, a test on the influence of the load disturbance on the adjustable speed characteristics and a PID-based constant speed performance detection test. The results of the verification test of the adjustable speed characteristics show that the theoretical value and actual value of the adjustable speed transmission characteristics of the HST used are essentially consistent with each other. The results of the test of the load disturbance’s influence on the adjustable speed characteristics show that the increase in load torque inhibits the HST output response. Therefore, the paper proposes and designs a PID-based closed-loop constant speed control system. The paper uses a step response test and a load disturbance test to research the control result of the constant speed system. Collecting and analyzing all test results, we find that the constant speed control based on PID has a very good result. The average error between the average HST output speed and the target speed set was 0.37%, and the average standard deviation of output speed was 1.18 rpm. In addition, the paper proposes a denoising method combing the empirical mode decomposition method and the Gaussian distribution determination. The method shows that the first two orders of the components of the HST response signal should be removed as noise. The paper uses the denoised signal and the partial least squares method to analyze the influencing factors of the constant speed control result. The analysis results show that the rate of change of load torque has the biggest influence on the stability of HST output speed, followed by the target value.

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Research on the HMCVT gear shifting smoothness of the four-speed self-propelled cotton picker

Cited by 11 publications

References 15 publications

I-SA Algorithm Based Optimization Design and Mode-Switching Strategy for a Novel 3-Axis-Simpson Dual-Motor Coupling Drive System of PEV

I-SA Algorithm Based Optimization Design and Mode-Switching Strategy for a Novel 3-Axis-Simpson Dual-Motor Coupling Drive System of PEV

Optimization of Shifting Quality for Hydrostatic Power-Split Transmission with Single Standard Planetary Gear Set

Research on Load Disturbance Based Variable Speed PID Control and a Novel Denoising Method Based Effect Evaluation of HST for Agricultural Machinery

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