Engagement and control of synchroniser mechanisms in dual clutch transmissions

Walker, Paul; Zhang, Nong

doi:10.1016/j.ymssp.2011.07.016

Cited by 33 publications

(14 citation statements)

References 20 publications

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“…This reversal of torque relationship or "ring unblocking" is explained in detail in [9] when the speed synchronization is done by synchronizer rings in synchronizer. If speed synchronization is done by electric motor the torque balancing relationships explained in [9] must still be respected to avoid unblocking before speed synchronization. After the torque reversal, sleeve teeth can push the blocker ring teeth aside and move towards idler gear dog teeth for engagement.…”

Section: Transition Between Speed Synchronization and Gear Engagementmentioning

confidence: 99%

Model Based Control of Synchronizers for Reducing Impacts during Sleeve to Gear Engagement

Piracha¹,

Grauers²,

Barrientos³

et al. 2019

SAE Technical Paper Series

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his paper presents a model based control strategy aimed to reduce noise and wear during gearshifts in conventional and hybrid Dual Clutch Transmissions (DCT and DCTH) and Automated Manual Transmissions (AMT). The control strategy is based on a newly developed dog teeth position sensor layout at China Euro Vehicle Technology AB (CEVT), a detailed simulation model for gear engagement and already existing speed sensors in the transmission. The details of dog teeth position sensor and simulation model are also presented in this paper. During gear shifting, noise is generated because of impacts between the sleeve teeth and the idler gear dog teeth after speed synchronization. Besides noise, these impacts are also responsible for delaying the completion of shift and contribute to wear in the dog teeth, hence reducing the lifespan of the transmission. The simulation model for gear engagement can simulate these impacts. Based on the simulation model and optimal control theory, an ideal dog teeth position trajectory is formulated that avoids the impact between sleeve and idler gear dog teeth, before the start of torque ramp up. The open loop strategy then controls the synchronization torque in the beginning of speed synchronization in such a way that the dog teeth position during shift follows the ideal dog teeth position trajectory. Since the control strategy is based on optimal control theory, its effect on speed synchronization time is minimal. The control strategy is designed in such a way that it can easily be applied in the existing transmission control software. By applying the control strategy on the simulation model, it is shown that the impacts during gear engagement are reduced. * (). FIGURE 13 Selected Batch simulation results

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Section: Transition Between Speed Synchronization and Gear Engagementmentioning

confidence: 99%

Model Based Control of Synchronizers for Reducing Impacts during Sleeve to Gear Engagement

Piracha¹,

Grauers²,

Barrientos³

et al. 2019

SAE Technical Paper Series

View full text Add to dashboard Cite

show abstract

“…The cone clutch torque (T C ) and the index torque (T I ) are now acting on the ring and influence this synchronization process. The piecewise cone clutch torque is derived as follows [15]:…”

Section: Fourth Stage Presentationmentioning

confidence: 99%

Advanced shifting control of synchronizer mechanisms for clutchless automatic manual transmission in an electric vehicle

Tseng

2015

Mechanism and Machine Theory

119

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“…16 So it is necessary for the shift actuator to possess the ability of robust position adjustment against load variation. 10 An active synchronizer control method is developed by Walker and Zhang, 17 eliminating the detrimental alignment related to the wet clutch drag torque. The synchronization process is described in detail by Li et al, 18 proposing a seven-phase gear shift procedure.…”

Section: Introductionmentioning

confidence: 99%

Compound optimal control for shift processes of a two-speed automatic mechanical transmission in electric vehicles

Chai

Zhang

2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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Public interest in pure electric vehicles equipped with two-speed automatic mechanical transmission is increasing because of not only widened high-efficiency operation zone but also reduced speed range and cost of electric drive system. In this paper, transient dynamic behaviors of an e-drive passenger car including clutch-free two-speed automatic mechanical transmission are analyzed during up and down shifts. Bench tests for the proposed electric driveline are conducted, by which the dynamic model and the shift control strategy are validated. In experiments, severe jerking phenomena are observed when the drive motor torque sharply decreases before the separation with current gear meanwhile fast increases after the engagement with target one. For alleviation of the torsional shocks, feed-forward control in combination with optimal torque feedback control is developed for the drive motor according to torque estimation of the half shaft using extended Kalman filtering method. Meanwhile, a sliding mode control is employed for precise positioning of the shift fork for the transmission. By comparisons of the simulation and test results, it is demonstrated that the proposed control strategy reduces the jerking intensity of driveline as well as the shift period effectively in shift process.

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Engagement and control of synchroniser mechanisms in dual clutch transmissions

Cited by 33 publications

References 20 publications

Model Based Control of Synchronizers for Reducing Impacts during Sleeve to Gear Engagement

Model Based Control of Synchronizers for Reducing Impacts during Sleeve to Gear Engagement

Advanced shifting control of synchronizer mechanisms for clutchless automatic manual transmission in an electric vehicle

Compound optimal control for shift processes of a two-speed automatic mechanical transmission in electric vehicles

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