Mathematical Model and Experimental Evaluation of Drag Torque in Disengaged Wet Clutches

Iqbal, Shoaib; Al‐Bender, Farid; Pluymers, Bert; Desmet, Wim

doi:10.5402/2013/206539

Cited by 39 publications

(32 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…9 Comparison of model and test result rpm which aligns well with the test data despite significant difference in the torque magnitude. On the contrary, the speed corresponding to peak torque from the model predictions of Yuan et al [8] and Iqbal et al [9] is around 400 rpm and that in case of Kato et al is 370 rpm. Clearly, the DT curve predicted by the proposed model is closer to the test data compared to the other models both in terms of the torque magnitude and peak occurrence.…”

Section: Comparision With Different Models and Test Resultsmentioning

confidence: 86%

See 1 more Smart Citation

Prediction of Drag Torque in a Disengaged Wet Clutch of Automatic Transmission by Analytical Modeling

et al. 2016

View full text Add to dashboard Cite

In the automotive industry one of the crucial issues is reduction of CO 2 emission to protect environment. A lot of researches have been done to reduce the CO 2 emission of cars by improving efficiency of engine and engine parts or lowering the weight. However, a significant reduction of CO 2 emission of cars can also be obtained from improvement of efficiency of transmission by reducing drag torque or spin loss in disengaged wet clutch. The reduction of drag torque can be achieved by introducing groove on facing of clutch disk and further reduction can be obtained by optimizing the shape of groove. Generally, the optimum shape of groove is decided by trial and error method which requires time, making sample, conducting a lot of tests and wasting a lot of raw materials. In this research, we proposed a new analytical model to predict the drag torque characteristics of a disengaged wet clutch of transmission without making any samples and performing any tests. The feature of the model: It bases on continuity and Navier-Stokes equation, a real time visualization investigation and laminar flow. The model is validated with tests results and the comparison result shows that they are very close to each other. The significance of the model is: it captures the multiphase drag torque characteristic which changes with changing gaps, speeds and oil flow rates. Moreover, the model is a green environment friendly tool to estimate drag torque characteristics without making any samples or conducting any drag tests.

show abstract

Section: Comparision With Different Models and Test Resultsmentioning

confidence: 86%

“…In 2013, Iqbal et al [9] presented a Drag Torque (DT) model accounting the effect of cavitation in laminar flow.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Drag Torque in a Disengaged Wet Clutch of Automatic Transmission by Analytical Modeling

et al. 2016

View full text Add to dashboard Cite

show abstract

“…In recent years, the necessity of better-understanding the physics of the fluid mechanics problem as well as the need for the extraction of fast generic results, has led many researchers into putting efforts in deriving analytical solutions of the similar-type flow problems [7][8][9]. Those efforts are concentrated in deriving truncated forms of the Navier Stokes equations set that are analytically solvable.…”

Section: Analytical Modelingmentioning

confidence: 99%

“…Ratio δ versus radial clearance, design point 3. r z Observing the Figs. (7)to(8) it is concluded that the dependence of δ on ḣ and ω 1 is negligible and therefore ̇ .…”

mentioning

confidence: 97%

Fast modelling and simulation of the dynamic behaviour of a wet multidisc clutch during the engagement phase

et al. 2019

View full text Add to dashboard Cite

In recent years multidisc wet friction clutches are of great importance to manufacturers of automatic transmissions (ATs) for the automotive industry, particularly since the introduction of double-clutched ATs. Their main advantage compared to their dryfriction counterparts is that they ensure smooth engagement, high reliability and long service life. Their progressive engagement due to the developed Couette flow between the discs enables them to be used both as clutches and as brakes in order to control power flow in simultaneously engaged geared shafts in the AT. Due to the coupled nature between the mechanical and the fluid dynamics regimes governing their operation, these systems are highly complex to be treated analytically and instead numerical approaches have proven to provide better results. However, the numerical treatment of such problems provides only case-specific results, which cannot be generalised and are not able to provide a general insight in the complex dynamics of the device. Furthermore the computational cost and the associated modelling and simulation effort during the design phase is high, making the incorporation of such methods in iterative design processes and algorithms counterproductive. In this paper the modelling of the dynamic behaviour of a wet multidisc clutch during the engagement phase is performed, via the combination of analytical and numerical methods and conclusions are drawn about the effect of the main geometric, kinematic and dynamic design parameters on the clutch's response. The dynamic modelling is performed by applying the principle of linear and angular momentum on each disc. The effect of the fluid film is taken into account through the solution of the governing Navier-Stokes equations via CFD analysis or by the use of semianalytical solutions with high accuracy, where applicable. Therefore both the developed pressure field and the torque of the fluid film are calculated efficiently and used in the simulation of the system. The flow is assumed to be laminar and the discs rigid and flat.

show abstract

“…Therefore, the gap between the piston and clutch plates for the oncoming clutch should be eliminated when the clutch torque capacity is near zero at the end of the clutch fill phase [6,7]. Nowadays most clutch torque models do not take hydraulic dynamic characteristics into account [8]. To optimize the engagement of clutches, clutch fill is usually formulated as an optimization problem.…”

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

View full text Add to dashboard Cite

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.

show abstract

Mathematical Model and Experimental Evaluation of Drag Torque in Disengaged Wet Clutches

Cited by 39 publications

References 11 publications

Prediction of Drag Torque in a Disengaged Wet Clutch of Automatic Transmission by Analytical Modeling

Prediction of Drag Torque in a Disengaged Wet Clutch of Automatic Transmission by Analytical Modeling

Fast modelling and simulation of the dynamic behaviour of a wet multidisc clutch during the engagement phase

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

Contact Info

Product

Resources

About