Fuzzy Determination of Target Shifting Time and Torque Control of Shifting Phase for Dry Dual Clutch Transmission

Zhao, Zhiguo; Chen, Haijun; Yang, Yunyun

doi:10.1155/2014/347490

Cited by 9 publications

(8 citation statements)

References 6 publications

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“…The transmission purposes to deliver the maximum engine torque through the clutch pack. The performance of the clutch depends on the transmission of the engine torque to the driven end [ 52 , 53 ]. Therefore, the optimal moment of inertia was 2 kg·m 2 because the maximum transmitted torque was 502.90 Nm at the driven end within the designed engagement time, whereas the engine’s maximum torque was 560 Nm.…”

Section: Resultsmentioning

confidence: 99%

Simulation of Design Factors of a Clutch Pack for Power-Shift Transmission for an Agricultural Tractor

Siddique

Kim

et al. 2020

Sensors

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The objective of this study is the simulation of the most affected design factors and variables of the clutch pack for the power-shift transmission (PST) of a tractor based measured data. The simulation model, the mathematical model of sliding velocity, a moment of inertia, and clutch engagement pressure of clutch pack were developed using the powertrain and configurations of the real PST tractor. In this study, the sensor fusion method was used to precisely measure the proportional valve pressure by test bench, which was applied to the simulation model. The clutch engagement times were found 1.20 s at all temperatures for determined factors. The engagement pressures have a significant difference at various temperatures (25 to 100 °C) of the hydraulic oils after the 1.20 s but the most affected factors were satisfied with the simulation conditions that ensure the clutch engagement on time. Finally, this sensor fusion method is believed to be helpful in realizing precision agriculture through minimization of power loss and maximum energy efficiency of tractors.

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Section: Resultsmentioning

confidence: 99%

Simulation of Design Factors of a Clutch Pack for Power-Shift Transmission for an Agricultural Tractor

Siddique

Kim

et al. 2020

Sensors

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“…where A, DA, B 1 , and B 2 , w, and u are defined in equation (24), y is the measured output, and all the state variables defined in equation 28can be measured, with C = I.…”

Section: Performance Evaluation Indexmentioning

confidence: 99%

“…Then, based upon the extremum value theorem, the clutch dynamic optimal engagement curves can be obtained in a number of typical working conditions. [18][19][20][21][22] However, this method cannot reflect drivers' intentions; 23 therefore, fuzzy control was introduced by Zhao et al 24 With a fuzzy-time decision and the model-based torque-coordinating control strategy, the shift quality is improved significantly. Furthermore, various driver's intentions can be reflected, with a strong robustness.…”

Section: Introductionmentioning

confidence: 99%

Control strategy optimization for a dual-clutch transmission downshift with a single slipping clutch during the torque phase

Liu

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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During the torque phase, appropriate coordination between two clutches is of vital importance to the dual-clutch transmission so that a high-quality shift is achieved without clutch interaction and engine flare, because a poor-quality shift definitely extends the shift time and increases the friction work. Concerning this problem, two different power flow conditions during the torque phase are discussed in detail, after investigation of the dual-clutch transmission downshift process and the design of an H∞ robust controller for the inertia phase. The results obtained indicate that, if two clutches are slipping simultaneously during the torque phase, either power interruption or power circulation occurs. Thus, by optimizing the relationship between the two clutches, a novel control strategy is proposed for the dual-clutch transmission so that the downshift process is accomplished with only one slipping clutch, in order to obtain the highest system efficiency. The system model was established on the MATLAB/Simulink platform and used to study the variations in the torque and the speed output in response to different control strategies. The simulation results show that, with the smooth inertia phase guaranteed by the robust controller, the proposed control strategy not only can avoid power interruption or power circulation during the torque phase but also can shorten the shift time (from 1.1 s to 0.8 s) and reduce the jerk level (from 6.8 m/s3 to 5.7 m/s3) effectively, in comparison with the conventional control strategy. Finally, to validate the effectiveness of the proposed control strategy, bench tests on a dual-clutch transmission were carried out, and the test data obtained show good agreement with the simulation results.

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“…Figure 1 shows a two-dimensional structural diagram of an 8-speed automatic transmission with five shift elements, namely, a brake 1 and four clutches 1-4, which are engaged or separated by the electrohydraulic control system of transmissions. To shift from one gear to another in an automatic transmission, one clutch must be released and another must be applied synchronously, which is called a clutch-to-clutch shift [1,2]. With the development of six-speed transmissions or even more speeds nowadays, considerable time and effort has been made to study the clutch-to-clutch shift control technology [1,3,4].…”

Section: Introductionmentioning

confidence: 99%

“…To shift from one gear to another in an automatic transmission, one clutch must be released and another must be applied synchronously, which is called a clutch-to-clutch shift [1,2]. With the development of six-speed transmissions or even more speeds nowadays, considerable time and effort has been made to study the clutch-to-clutch shift control technology [1,3,4]. Asynchronous clutch control would cause power interruption or overconstraint [5].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis and Control of the Clutch Filling Process in Clutch-to-Clutch Transmissions

Guo

Liu

Zhang

et al. 2014

Mathematical Problems in Engineering

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Clutch fill control in clutch-to-clutch transmissions influences shift quality considerably. An oncoming clutch should be applied synchronously with the release of an offgoing clutch to shift gear smoothly; therefore, the gap between the piston and clutch plates should be eliminated when the torque capacity is near zero at the end of the clutch fill phase. Open-loop control is typically implemented for the clutch fill because of the cost of pressure sensor. Low control precision causes underfill or overfill to occur, deteriorating shift quality. In this paper, a mathematical model of an electrohydraulic clutch shift control system is presented. Special dynamic characteristic parameters for optimal clutch fill control are subsequently proposed. An automatic method for predicting initial fill control parameters is proposed to eliminate distinct discrepancies among transmissions caused by manufacturing or assembling errors. To prevent underfill and overfill, a fuzzy adaptive control method is proposed, in which clutch fill control parameters are adjusted self-adaptively and continually. Road vehicle test results proved that applying the fuzzy adaptive method ensures the consistency of shift quality even after the transmission’s status is changed.

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Fuzzy Determination of Target Shifting Time and Torque Control of Shifting Phase for Dry Dual Clutch Transmission

Cited by 9 publications

References 6 publications

Simulation of Design Factors of a Clutch Pack for Power-Shift Transmission for an Agricultural Tractor

Simulation of Design Factors of a Clutch Pack for Power-Shift Transmission for an Agricultural Tractor

Control strategy optimization for a dual-clutch transmission downshift with a single slipping clutch during the torque phase

Dynamic Analysis and Control of the Clutch Filling Process in Clutch-to-Clutch Transmissions

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