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Guided By, Prof. P. BaskarSMBS

VIT University

Seminar by,Sanchit jain

13MAE0012

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Introduction All-Terrain Vehicles (ATVs) are frequently used for off-roaddriving, including agricultural and traction work, and there is astrong demand for easy operation.

ATs waste engine power in the transmission mechanism, resultingin a degradation of fuel consumption and dynamic performance,so they developed a dual-clutch transmission for ATVs.

The dual-clutch transmission provides better fuel consumptionand dynamic performance than other ATs.

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Problems

Development of DCT.

Hammering noise at the time of engagement.Complex mechanism of DCT.Gear shift mechanism with shift drum.Cost

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Mechanism

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Structure of DCT.Structure 0f transmission.Structure of pre-shift.

Gear change process.

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Noise

The hammering noise fromthe dog clutch mainlyresults from the rotationalkinetic energy caused by thedifference between therotating speeds of gear andshifter when the dog clutch isengaged. This rotational

kinetic energy is transducedinto noise and heatgenerated at the collision ofthe dog and the pocket.

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Motion of Shift drum

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Result

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Result

A dual-clutch transmission utilizing a gear train with dog-clutch was developed successfully.Hammering noise caused by the engagement of the dog-

clutch was reduced by control of the motor-driven shift andgear shift mechanisms. The basic design of the gear is the same as that in a MT,though the main shaft structure and the layout of gear stages

are different. A dual-clutch transmission using a gear shift mechanism with shift drum was developed successfully.The clutch, transmission axis, and gear shift axis are the same

as those in a MT.

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Introduction

At present, there are no clear criteria to judge the quality of shiftquality and shift control effect about DCT . That is, based on theshock of degree, work of slipping which is produced by

transmission system to assessment the shift quality roughly.

This paper took the research on shift quality evaluation andoptimization of a DCT prototype, on the one hand, the controltarget and control method On the other hand, it is optimized thecontrol strategy and control algorithm of DCT system.

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Problems-

Control strategy.Performance Evaluation.

Optimization.Cost analysis.

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Guaranteeing the vehicle dynamic performance and thelife time of power transmission system, shifted quicklyand smoothly and meet comfort requirements.

Large fluctuations, flutter, flame out and destroy thesmooth of shifting if the clutch engaging too fast; To thecontrary, if the clutch engaging too slow, the slipping

work will increase quickly and reducing the clutchservice life.

Shift quality evaluation

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Model and evaluation system design

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Steps for Systematic Gear Set Development

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The simulation platform which based on the vehiclesystem model and evaluation system integrationreaches the evaluation index of control expectedinterval when shift quality evaluation achieved optimalthrough the evaluation.

The optimal control targets of DCT system shift qualityand ensuring each index fell on within the control

expectation interval, it can guarantee the DCT has goodshift quality by compromising each index.

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Results of Optimization

The fuzzy control rules of clutch

engaging speedregulation after optimizing

The fuzzy control rules of throttle

adjustment afteroptimizing

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Results

The simulation curve of shifting with full throttle

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Thank You

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QURRIES

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1. Control of hammering noise-Methods are available to minimize the impact energy of dog-clutch

engagement to be absorbed Decreasing the inertial mass of the shifter system Decreasing the ratio difference Decreasing the difference in rotational speed

2. How do we control pre-shift mechanism.

The feed control of motor-driven shifting is divided into eightsteps to accommodate the above mechanism, and the motoroutput (Duty value) and time are controlled for each step .

3. Why were they not using the synchronization mechanism.

The synchronization mechanism leads to a larger transmission size,heavier weight, and a cost increase due to the increased number ofparts.

1st paper-

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2nd paper-