Experimental Characterization of Wet Clutch Friction Behaviors Including Thermal Dynamics

Ivanović, Vladimir; Herold, Zvonko; Deur, Joško; Hancock, Matthew; Assadian, Francis

doi:10.4271/2009-01-1360

Cited by 33 publications

(14 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The friction coefficient of a wet clutch changes with slip speed and temperature [3,4,5] Therefore friction coefficient is treated as a function of slip speed and temperature in this modelling. Friction characteristic of the engine clutch is represented in figure 4.…”

Section: Clutch Modelmentioning

confidence: 99%

Engine clutch pressure command control for a parallel hybrid vehicle at launching when traction motor failed

Seo

Lee

Lim

et al. 2013

2013 World Electric Vehicle Symposium and Exhibition (EVS27)

View full text Add to dashboard Cite

A parallel type HEV (Hybrid Electric Vehicle) has a power transfer device that is constructed by wet clutches and the device is called 'Engine Clutch'. The Engine Clutch is located between engine and electric traction motor so it transfers power of engine when the engine is started and clutches are engaged or cut the power when regenerative braking is occurred. When a traction motor of a parallel type HEV (Hybrid Electric Vehicle) could not generate torque to launch, the HEV should launch only by engine power.Because the engine should rotate at the stated idle speed to prevent the engine stop the relative rotational speed of clutch input and output shaft starts from engine idle speed and ends to zero when clutches engaged.In this study a method for control pressure command of engine clutch is proposed to satisfy desired clutch engagement time and decrease shock. A dynamic model of a parallel type HEV powertrain (including hydraulic clutch control components) is constructed to validate the method proposed.

show abstract

Section: Clutch Modelmentioning

confidence: 99%

Engine clutch pressure command control for a parallel hybrid vehicle at launching when traction motor failed

Seo

Lee

Lim

et al. 2013

2013 World Electric Vehicle Symposium and Exhibition (EVS27)

View full text Add to dashboard Cite

show abstract

“…Due to its inability to capture the squeeze dynamics of the fluid film at the mating plane of the clutch, the static model, in general, is inadequate for accurately representing the clutch-engagement dynamics at low clutch pressures or slip speeds, as at these low-power shifts the fluid film dynamics is comparable to the overall engagement dynamics [21], [18]. Also, a static model with clutch coefficient of friction expressed solely as a function of the clutch slip speed does not include effects of lubrication aging [8] and transmission fluid temperature variations [53]. [106] for dual clutch transmissions.…”

Section: Powertrain Modelingmentioning

confidence: 99%

Robust nonlinear estimation and control of clutch-to-clutch shifts

Mishra

Srinivasan

2016

2016 American Control Conference (ACC)

View full text Add to dashboard Cite

Shift quality is an integral component of drivability. Thus, with the extension of feedback control to more powertrain functions, it is of paramount importance that systematic and robust control methods be developed for ensuring good shift quality. Increasingly, automatic transmissions employ a combination of two actively controlled clutches to implement shifts, which makes the gearshifts clutch-to-clutch shifts. In the current study, a model-based approach is presented for the development of a robust clutch-to-clutch shift controller. A detailed nonlinear model of the powertrain consisting of engine, torque converter, transmission system, and vehicle dynamics is developed. The transmission system consists of mechanical and hydraulic subsystems. While the mechanical subsystem is easier to model, the hydraulic subsystem, commonly referred to as shift hydraulic system, is usually challenging to model due to high dynamic order and significant nonlinearities. Starting from a high order nonlinear model of the shift hydraulic dynamics, developed from first principles in an earlier study, we apply systematic methods to arrive at a lower order control-oriented model, and use it to develop a closed loop clutch pressure controller. Specifically, state-space averaging and singular perturbation techniques were used to achieve this. The reduced order model was validated against experimental measurements.

show abstract

“…Ivanovic´et al also developed a thermal dynamic model based on thermal energy balance and lumped system analysis. 4 A key point of the model is a heat convection coefficient to encompass all existing heat transfer mechanisms, such as conduction and radiation. The heat convection coefficient is described by a regression curve obtained from experiments.…”

Section: Introductionmentioning

confidence: 99%

Modeling of heat transfer for a wet multi-plate clutch based on empirical data

Kim

Shim

2017

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

A heat transfer model of a wet multi-plate clutch based on empirical data is presented in this paper. Lumped system analysis was used to simplify the complex heat transfer system of the wet clutch. The model has included the effects of various design parameters of the wet clutch, such as rotating speed, flow rate and inlet temperature of the lubricant, clutch sizes, and groove types, by using the correlations of the heat convection coefficient. The correlations were obtained from 96 experiments that were designed to study the effects of the design parameters. The coefficients of the correlations were determined by the non-dominated sorting genetic algorithm (NSGA-II) to minimize errors between the simulated and the experimental results. The simulated results were compared with the experimental results to demonstrate the validity of the model and the correlations by using the percentage error, the root-mean-square error, and the correlation coefficient. The validation parameters were in good agreement with the experimental results.

show abstract

Experimental Characterization of Wet Clutch Friction Behaviors Including Thermal Dynamics

Cited by 33 publications

References 14 publications

Engine clutch pressure command control for a parallel hybrid vehicle at launching when traction motor failed

Engine clutch pressure command control for a parallel hybrid vehicle at launching when traction motor failed

Robust nonlinear estimation and control of clutch-to-clutch shifts

Modeling of heat transfer for a wet multi-plate clutch based on empirical data

Contact Info

Product

Resources

About