Improved Optimal Control of Dry Clutch Engagement

Dolcini, Pietro; Wit, Carlos Canudas de; Bechart, Hubert

doi:10.3182/20050703-6-cz-1902.01892

Cited by 29 publications

(14 citation statements)

References 8 publications

(9 reference statements)

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“…During this process certain specifications must be met: -, that is engine stall must be avoided (no-kill condition) as well as engine over revolution; , that is, the difference between engine and main shaft acceleration at lock-up must be minimized to avoid oscillations (no-lurch condition); -, the energy spent during engagement, must be minimized. It is possible to fulfil these specifications by incorporating them into optimal control problems (as in [3,8,9]), even though the resulting control law is usually quite cumbersome to implement. Otherwise, conventional structures can be used, as the decentralized PID controllers on engine speed and slipping speed suggested in [5], provided that "sensible" trajectories are chosen for the controlled variables.…”

Section: Amt Control For Vehicle Start-upmentioning

confidence: 99%

“…Let us focus on the most important phase for vehicle start-up and gear shifting, that is the clutch slipping phase during engagement, when the friction between clutch disk and flywheel allows engine torque transmission to the main shaft then to the transmission shaft. For this phase, a typical modeling choice is to consider the main shaft rigid (as proposed in [5] and restated in [9]): Conceptual driveline scheme for AMT. …”

Section: Driveline Modeling For Amtmentioning

confidence: 99%

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Towards Integrated Powertrain Control for a Mild-Hybrid Urban Vehicle with a Downsized Turbo-Charged CNG Engine

Tona

Moulin

Venturi

et al. 2007

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Vers le contrôlé intégré du groupe moto-propulseur pour un véhicule urbain hybride avec un moteur éco-suralimenté au GNV -Pour son abondance et sa capacité à réduire les émissions des gaz à effet de serre (notamment le CO 2 ), le gaz naturel pour véhicules (GNV) est considéré comme l'un des carburants alternatifs les plus prometteurs. Le potentiel du GNV, lorsqu'il est utilisé comme carburant d'un moteur éco-suralimenté dédié sur un petit véhicule urbain, a déjà été démontré par un premier prototype réalisé par l'IFP. Pour mieux profiter des qualités du GNV, cette approche peut être ultérieurement développée en exploitant les possibilités offertes par un groupe moto-propulseur hybride, obtenu en rajoutant au moteur thermique GNV une deuxième source de puissance, électrique cette foisci. Dans cette perspective, VEHGAN, un nouveau projet de l'IFP, vise précisément à développer un prototype de véhicule hybride léger au GNV basé sur une Smart équipée du système StARS de Valeo, avec un alterno-démarreur réversible et des super-capacités. Le déroulement de ce projet, encore en cours, a d'ores et déjà soulevé des problématiques contrôle moteur très intéressantes, telles que l'intégration d'une nouvelle source de puissance et la gestion du système de transmission robotisé. Abstract -Towards Integrated Powertrain Control for a Mild-Hybrid Urban Vehicle with a Downsized Turbo-Charged CNG Engine -Compressed natural gas (CNG) is considered as one of the most promising alternative fuels for transportation due to its ability to reduce greenhouse gas emissions (CO 2 , in particular) and its abundance. An earlier study from IFP has shown that CNG has a considerable potential when used as a fuel for a dedicated downsized turbo-charged

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Section: Amt Control For Vehicle Start-upmentioning

confidence: 99%

Section: Driveline Modeling For Amtmentioning

confidence: 99%

Towards Integrated Powertrain Control for a Mild-Hybrid Urban Vehicle with a Downsized Turbo-Charged CNG Engine

Tona

Moulin

Venturi

et al. 2007

Oil & Gas Science and Technology - Rev. IFP

View full text Add to dashboard Cite

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“…More advanced models include submodels for slipping and sticking torques. For example a LuGre model is used in Dolcini et al (2005) and a Karnopp model in Bataus et al (2011). The former is a one-state model that captures stick-slip behavior, varying break-away force, Stribeck effect, and viscous friction.…”

Section: Clutch Modelsmentioning

confidence: 99%

Dry Clutch Modeling, Estimation, and Control

Myklebust

2014

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The graph on the cover is based on data from Figure 4 in Paper D. Actuator position, time, and clutch torque are on the axes and the coloring depends on the clutch disc temperature. The details are left as an exercise to the reader. The drawing in the background pictures a clutch disc.Typeset with L A T E X 2 ε Printed by LiU-Tryck, Linköping, Sweden 2014 "A mathematical model does not have to be exact; it just has to be close enough to provide better results than can be obtained by common sense." -Herbert A. Simon AbstractIncreasing demands on comfort, performance, and fuel efficiency in vehicles lead to more complex transmission solutions. One such solution is the Automated Manual Transmission (AMT). It works just like an ordinary manual transmission but the clutch and the gear selection are computer controlled. In this way high efficiency can be accomplished with increased comfort and performance. To be able to control and fully utilize an AMT, it is of great importance to have knowledge about how torque is transmitted in the clutch. The transmitted torque in a slipping dry clutch is therefore studied in a series of experiments with Heavy Duty Trucks (HDT). It is shown that material expansion with temperature can explain torque variations up to 900 Nm for the same clutch actuator position. A dynamic clutch temperature model that can describe the torque variations is developed. The dynamic model is validated in experiments, and shown to reduce the error in transmitted torque from 7 % to 3 % of the maximum engine torque compared to a static model. Since all modeling, parameter estimation, and validation are performed with production HDTs, i.e. production sensors only, it is straightforward to implement the model in a production HDT following the presented methodology.The clutch model is extended with lock-up/break-a-part dynamics and an extra state describing wear. The former is done using a state machine and the latter uses a slow random walk for a parameter corresponding to the thickness of the clutch disc. Two observability analyses are made: one with production sensors, and one with a torque sensor in addition to the production sensors. The analyses show that, in both cases, the temperature states and the wear state are observable both during slipping of the clutch and when it is fully closed. The latter is possible since a sensor measures the actuator position. The unknown offset in the torque sensor is possible to observe (at all times) if the model is further augmented with engine inertia dynamics. An Extended Kalman Filter (EKF) is developed and evaluated on measurement data for both cases. The estimated states converge from poor initial values, enabling prediction of the translation of the torque transmissibility curve and sensor offset. The computational complexity of the EKF is low and it is thus suitable for real-time applications.The clutch model is also integrated into a driveline model capable of capturing vehicle shuffle (longitudinal speed oscillations) and engine torque fluctuations. Parameter...

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“…More advanced models include submodels for slipping and sticking torques. For example a LuGre model is used in Dolcini et al [2005] and a Karnopp model in Bataus et al [2011]. The former is a one-state model that captures stick-slip behavior, varying breakaway force, Stribeck effect, and viscous friction.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Thermal Expansion in a Dry Clutch on Launch Control

Myklebust

Eriksson

2013

IFAC Proceedings Volumes

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A dry clutch model with thermal dynamics is added to a driveline model of a heavyduty truck equipped with an automated manual transmission. The model captures driveline oscillations and can be used to simulate how different clutch-control strategies affect vehicle performance, drivability and comfort. Parameters are estimated to fit a heavy-duty truck and the complete model is validated with respect to shuffle, speed trajectory, clutch torque and clutch lock-up/break-apart behavior. The model shows good agreement with data. Furthermore the model is used to study the effect of thermal expansion in the clutch on launch control. It is shown that the effect of thermal expansion, even for moderate temperatures, is significant in launch control applications.

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Improved Optimal Control of Dry Clutch Engagement

Cited by 29 publications

References 8 publications

Towards Integrated Powertrain Control for a Mild-Hybrid Urban Vehicle with a Downsized Turbo-Charged CNG Engine

Towards Integrated Powertrain Control for a Mild-Hybrid Urban Vehicle with a Downsized Turbo-Charged CNG Engine

Dry Clutch Modeling, Estimation, and Control

The Effect of Thermal Expansion in a Dry Clutch on Launch Control

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