Manual Transmission: Synchronization Main Aspects

Neto, Demetrio Vettorazzo; Florencio, Daniel Gama; Rodrigues, Pedro; Fernandez, J.B. Rosas

doi:10.4271/2006-01-2519

Cited by 11 publications

(2 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The synchronizer mechanism consists of a gearshift sleeve with internal dog gearing, connected to the synchronizer body and to the transmission shaft, cone synchronizer rings with locking toothing, and a synchronizer hub with selector teeth and friction cone, connected to the gear which is idle on the transmission shaft thanks to needle roller bearings (Naunheimer et al, 2011;Neto et al, 2006).…”

Section: Synchronizers Modelmentioning

confidence: 99%

Control-Oriented Models for Real-Time Simulation of Automotive Transmission Systems

Cavina

Corti

Marcigliano

et al. 2014

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

View full text Add to dashboard Cite

-A control-oriented model of a Dual Clutch Transmission (DCT) was developed for realtime Hardware In the Loop (HIL) applications, to support model-based development of the DCT controller and to systematically test its performance. The model is an innovative attempt to reproduce the fast dynamics of the actuation system while maintaining a simulation step size large enough for real-time applications. The model comprehends a detailed physical description of hydraulic circuit, clutches, synchronizers and gears, and simplified vehicle and internal combustion engine submodels. As the oil circulating in the system has a large bulk modulus, the pressure dynamics are very fast, possibly causing instability in a real-time simulation; the same challenge involves the servo valves dynamics, due to the very small masses of the moving elements. Therefore, the hydraulic circuit model has been modified and simplified without losing physical validity, in order to adapt it to the real-time simulation requirements. The results of offline simulations have been compared to on-board measurements to verify the validity of the developed model, which was then implemented in a HIL system and connected to the Transmission Control Unit (TCU). Several tests have been performed on the HIL simulator, to verify the TCU performance: electrical failure tests on sensors and actuators, hydraulic and mechanical failure tests on hydraulic valves, clutches and synchronizers, and application tests comprehending all the main features of the control actions performed by the TCU. Being based on physical laws, in every condition the model simulates a plausible reaction of the system. A test automation procedure has finally been developed to permit the execution of a pattern of tests without the interaction of the user; perfectly repeatable tests can be performed for nonregression verification, allowing the testing of new software releases in fully automatic mode.Re´sume´-Mode´lisation oriente´e-controˆle pour la simulation en temps re´el des syste`mes de transmission automobile -Un mode`le oriente´vers le controˆle d'une transmission a`double embrayage (DCT, Dual Clutch Transmission) a e´te´de´veloppe´et imple´mente´en temps re´el dans un syste`me Hardware In the Loop (HIL), pour supporter le de´veloppement du controˆleur DCT et pour tester syste´matiquement ses performances. Le mode`le repre´sente une tentative innovatrice de reproduire les dynamiques rapides du syste`me d'actionnement tout en conservant une dimension de pas de calcul assez grande pour l'application en temps re´el. Le mode`le comprend une description physique de´taille´e du circuit hydraulique, des embrayages, des synchroniseurs et des engrenages, et des sous-mode`les simplifie´s du ve´hicule et du moteur ac ombustion interne. Comme l'huile circulant dans le syste`me est caracte´rise´e par un module de compressibilite´e´leve´, les dynamiques de pression sont tre`s rapides, pouvant provoquer une Oil & Gas Science and Technology -Rev. IFP Energies nouvelles, Vol. 70 (2015), No. 1,...

show abstract

Section: Synchronizers Modelmentioning

confidence: 99%

Control-Oriented Models for Real-Time Simulation of Automotive Transmission Systems

Cavina

Corti

Marcigliano

et al. 2014

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

View full text Add to dashboard Cite

show abstract

“…Further the problems associated with driving in crowded cities like stress to the driver due to constant changing of gears and clutch operation have led to the emergence of automatic transmission. The automatic transmission has efficiency lower than the manual; hence the best alternative to solve both the problems is automation of the manual transmission.D.V Neto, D. G Florencio, P Rodrigues and J Fernandez [3] have described the Manual transmission synchronizer, its function and design. The mutual working of the gear shift lever working and transmission components is discussed.…”

Section: Introductionmentioning

confidence: 99%