Improving the gearshifts events in automated manual transmission by using an electromagnetic actuator

Lin, Shusen; Chang, Siqin; Li, Bo

doi:10.1177/0954406214546204

Cited by 12 publications

(15 citation statements)

References 21 publications

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“…When the synchronizer ring stops rotating, the sleeve continues to move toward the target gear until the contact of spline chamfers. 24 There are three kinds of possibilities of the relative position of the spline teeth. Figure 5 shows the three possible positions of the sleeve which are hard to detect and distinguish during the gearshift process.…”

Section: Presentation Of the Working Phasesmentioning

confidence: 99%

Gearshift performance improvement for an electromagnetic gearshift system based on optimized active disturbance rejection control method

Lin

Jiao

2019

Advances in Mechanical Engineering

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Electric automated manual transmission usually adopts direct current motors and intermediate gearings to accomplish gear change. The structure can be simplified further to achieve better dynamic response and mechanical efficiency. A new type of gearshift system which adopts two electromagnetic linear actuators is presented. The intermediate gearings including motion converters are canceled, and the electromagnetic linear actuators drive the shift fork directly to move the synchronizer to engage different gears. The novel gearshift system is described in detail, including the connection, working principle, and performance. Specific working phases of the synchronization are introduced and mathematical equations of each phase are provided. After the specific feature analysis of each phase, the performance effect factors are deduced and the corresponding control requirements are proposed. Considering the stability of the performance, the robust control method, namely, active disturbance rejection control, is adopted. The time optimal method is introduced to optimize the dynamic response of the active disturbance rejection control method to achieve a shorter gearshift time. Comparative simulations among the active disturbance rejection control, time optimal-active disturbance rejection control, and proportional-integral-derivative methods show the distinct improvements of the novel gearshift system combined with the time optimal-active disturbance rejection control method. Finally, gearshift experiments are implemented. The results demonstrated the availability of the novel gearshift system and the designed control strategy.

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Section: Presentation Of the Working Phasesmentioning

confidence: 99%

Gearshift performance improvement for an electromagnetic gearshift system based on optimized active disturbance rejection control method

Lin

Jiao

2019

Advances in Mechanical Engineering

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“…The change rate of the shift force is limited by the degree of impact [10]. If the drag torque is ignored, it can be described as follows:…”

Section: Reference Forcementioning

confidence: 99%

“…Take the 3rd to 4th gear shift process as an example. The cascade 2DOF controller and the PID controller (as shown in [10]) are compared in the 3rd to neutral gear shift out process. Figure 19a, b shows the experimental results of the position and tracking error variation.…”

Section: Experimental Validationsmentioning

confidence: 99%

“…However, because the magnets are mounted on a soft magnetic core, the moving mass of the moving-magnet-type linear actuator is relatively high, and so it is detrimental to the fast dynamic response of the actuator. Consequently, the moving-coil-type linear actuator (MCLA), which has the characteristic of high force and low inertia, is beginning to be applied for the shifting control [10]. In [11], a gear shift system based on the MCLA is proposed for a formula SAE race car and the test result indicates that an effective use of the MCLAs enabled the upshift time to be almost halved than the original structure.…”

Section: Introductionmentioning

confidence: 99%

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Cascade compound controller for direct-drive gear shift modules in automated mechanical transmission

Zhou

Chang

Guo

2018

J Braz. Soc. Mech. Sci. Eng.

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A direct-drive gear shift module, which is based on electromagnetic linear actuator (EMLA), is introduced to improve the performance of the shift-by-wire system in automated mechanical transmission. The research background and approaches are first proposed. Then, the structure, characteristics and dynamic model of the EMLA are presented. In order to improve the shift quality, the position and force modes of the EMLA are divided to realize piecewise control strategy for the gear shift process. A cascade two degree of freedom compound controller is designed for these two modes. Specifically, the feedforward controller is based on the differential flatness to achieve high-response tracking performance and the feedback controller is based on the linear extended state observer to ensure robustness against plant uncertainties and disturbances. Simulation and experiment results proved that this cascade compound controller is effective, the duration of the whole shifting process is minimized, and the shift quality is significantly improved. The direct-drive gear shift module is technically feasible.

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“…Synchronization stage was represented by a friction torque. Lin et al 22 proposed a novel gearshift system that utilized a 2-DOF electromagnetic actuator to realize the automation of gearshift, in which synchronizer was modelled as a simple friction element. Lucente et al 23 developed physically based detailed nonlinear models of the electro-hydraulic actuated gearbox and the dry clutch electro-hydraulic actuator of an AMT.…”

Section: Introductionmentioning

confidence: 99%

Modelling and simulation of synchronization and engagement for self-energizing synchronizer with multibody dynamics

Feng

Jiang

et al. 2017

Advances in Mechanical Engineering

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A multibody dynamic model of the self-energizing synchronizer in a 14-speed manual transmission gearbox is presented. While the contact forces between the engaged splines/teeth and friction torques between the synchro rings are hardly observed by conventional experiments, detailed contact and friction models in consideration of lubrication are established to simulate these contact/friction forces during shifting. The space motion of the sleeve is considered; thus, the differences in the contact forces between the engaged teeth can be simulated and observed. A pneumatic model is established to model the varying shift force acting on the synchronizer. An experiment is conducted for the self-energizing synchronizer to validate the presented synchronizer model. Moreover, to demonstrate the self-energizing function of the synchronizer, a synchronizer without self-energizing mechanism is modelled and compared with the original one.

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Improving the gearshifts events in automated manual transmission by using an electromagnetic actuator

Cited by 12 publications

References 21 publications

Gearshift performance improvement for an electromagnetic gearshift system based on optimized active disturbance rejection control method

Gearshift performance improvement for an electromagnetic gearshift system based on optimized active disturbance rejection control method

Cascade compound controller for direct-drive gear shift modules in automated mechanical transmission

Modelling and simulation of synchronization and engagement for self-energizing synchronizer with multibody dynamics

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