Analysis of shifting performance of power shuttle transmission

Kim, D.C.; Kim, K.U.; Park, Y.J.; Huh, Jun Young

doi:10.1016/j.jterra.2006.04.001

Cited by 34 publications

(14 citation statements)

References 3 publications

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“…The effects of design parameters on wet-slide forwardbackward shuttle systems on a tractor reveal that gear quality is a first-order function of the pressure modulation [11]. The peak torque and the normal clutch force increase with increasing tractor speed.…”

Section: Fig 2 Schematic Overview Of a Typical Multi-plate Wet Clutchmentioning

confidence: 99%

Modeling Simulation and Validation of a Tractor Wet Clutch Controlled by Proportional Valve

Livatyalı¹,

Yel²

2021

International Journal of Automotive Science and Technology

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Wet clutch is a widely used machine element in the agricultural machines be-cause it allows the transmission of high torque with a more user-friendly turn on/off. In this article, the control of a wet clutch pack using a proportional valve in the power take-off unit is investigated. A wet clutch package is implemented on the transmission direct PTO shaft and actuate the power take-off unit of an ag-ricultural tractor. A one-dimensional mathematical model of the wet clutch and the electro-hydraulic control system was developed. Several actuation cases were simulated, and responses of all circuit elements were evaluated. Based on these predictions, test procedures with out-put torque values 300 and 600 N-m were set at 1.900 rpm unloaded engine speed. Variables, including speed, pres-sure, and temperature, were recorded in the experiments. The test and simulation results were compared. The clutch pressure increase was 10% under-predicted while the mainline pressure drop was 1% over-predicted. The proposed 1-D model can be further improved indeed. Yet, the acceptable agreement between the model and tests, offer less costly trial-and-error in the design and tune-up of future systems.

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Section: Fig 2 Schematic Overview Of a Typical Multi-plate Wet Clutchmentioning

confidence: 99%

Modeling Simulation and Validation of a Tractor Wet Clutch Controlled by Proportional Valve

Livatyalı¹,

Yel²

2021

International Journal of Automotive Science and Technology

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“…For frequent shifting, operations such as shift levers and clutch pedal operations cause inconvenience to farmers and lower work efficiency. As an alternative, in the agricultural tractor field, some studies have been carried out on using a power shuttle [18][19][20][21][22][23] or power shift [24][25][26] capable of automatic F/R transmission using a hydraulic system. Li et al [26] designed and proposed an automatic gear-shifting system capable of semi-automatic shifting with power shift transmission.…”

Section: Introductionmentioning

confidence: 99%

Development of Control System for Automated Manual Transmission of 45-kW Agricultural Tractor

Kim

et al. 2020

Applied Sciences

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This study aims to develop and evaluate an automated manual transmission (AMT) for agricultural tractors with high efficiency and high convenience by using electric actuators. An AMT system to control manual-type shuttle gearboxes and transmissions for tractors is developed by adding a shuttle shifting actuator, a clutch actuator, and a control system to a conventional manual transmission (MT). The clutch actuator is designed using an electric motor and a reduction gear. The AMT control system is developed and experimental tests are conducted to evaluate the performance of the AMT. The results of the performance of the actuator position control demonstrate that the shuttle shifting actuator and clutch actuator are controlled appropriately, achieving a maximum overshoot of less than 5% and 0%, a settling time of less than 0.500 s and 1.50 s, and a steady-state error of less than 1% and 1%, respectively. The performance of the automatic forward and reverse control demonstrates a shift control time of less than 2.50 s and target revolutions per minute (RPM) reaching time of less than 3.00 s. Thus, AMT systems for tractors can be easily developed by applying shuttle shifting actuators, clutch actuators, and a control system to conventional manual transmissions.

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“…9 A three-parameter shifting law invented to improve the shift characteristics of vehicles. 10–12 An experimental study on the factors affecting the quality of the tractor HMCVT, and further proposed a control strategy and an optimization scheme to improve the quality of the road section. 13,14 Due to the functional requirements of the cotton picker, the HMCVT realized a stepless variable speed output that used low-power hydraulic components to transmit high-power and increased the efficiency of the entire transmission system.…”

Section: Introductionmentioning

confidence: 99%

Research on adaptive control strategy of hydraulic mechanical continuously variable transmission of a cotton picker

Zhao

Wang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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Hydraulic mechanical continuously variable transmission has the advantages of good hydraulic stepless speed regulation performance and high efficiency of mechanical transmission, which can achieve the optimal matching of transmission system load and power source. In this article, an adaptive control strategy based on radial basis function neural network and proportional–integral–derivative control was proposed. The speed compound control method was used to solve the problems that the output speed of the hydraulic mechanical continuously variable transmission system was poor at the variable speed input and was difficult to control. The throttle opening and the engine speed were used as controller inputs. The pump–motor's displacement ratio and the output speed were used as controller outputs. Finally, the output speed of the cotton picker was stably controlled. Simulation and experimental results show that the transmission can quickly respond to the target speed and had little fluctuation based on different initial input speeds. The control strategy had good control precision and robustness. Compared with the traditional proportional–integral–derivative algorithm, the average steady-state error of the system output speed was controlled between ±0.0125%. The proposed algorithm based on radial basis function neural network proportional–integral–derivative adaptive control strategy had obvious control effect, and the stability of the speed output of the system was improved under the nonlinear input complex conditions. It provided research for the speed ratio adjustment and control of the hydraulic mechanical continuously variable transmission of the cotton picker.

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Analysis of shifting performance of power shuttle transmission

Cited by 34 publications

References 3 publications

Modeling Simulation and Validation of a Tractor Wet Clutch Controlled by Proportional Valve

Modeling Simulation and Validation of a Tractor Wet Clutch Controlled by Proportional Valve

Development of Control System for Automated Manual Transmission of 45-kW Agricultural Tractor

Research on adaptive control strategy of hydraulic mechanical continuously variable transmission of a cotton picker

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