Search results for "Automatic transmission"

showing 3 items of 3 documents

A new approach to the design of a speed-torque-controlled rubber V-belt variator

2005

This paper presents a new model for a torque-speed-sensing rubber V-belt variator. The actuators are of the centrifugal roller kind on the driver side and a helical torque cam plus a compression-torsion spring on the driven side. The equations permit designing the actuator geometry in order to keep the transmissible torque as close as possible to the torque request in the whole operative field. Moreover, a procedure is suggested for the most proper design of an automatic variator of this kind. It permits choosing the required variogram of the transmission, i.e. the matching between the engine and the transmission, and designing the actuators: roller mass, housing shape, contact plate angle…

EngineeringTest benchVariatorAutomatic transmissionbusiness.industryMechanical EngineeringAerospace EngineeringTorsion (mechanics)Mechanical engineeringThrustComputer Science::Otherlaw.inventionComputer Science::Roboticslawcontinuously variable transmission rubber V-belt automatic transmission axial thrusts regulation.TorqueActuatorbusinessSimulationContinuously variable transmissionProceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
researchProduct

Optimal design of an electro-hydraulic valve for heavy-duty vehicle clutch actuator with certain constraints

2016

Abstract The main objective of this paper is to investigate the sensitivity analysis and optimal design of a proportional solenoid valve (PSV) operated pressure reducing valve (PRV) for heavy-duty automatic transmission clutch actuators. The nonlinear electro-hydraulic valve model is developed based on fluid dynamics. In order to implement the sensitivity analysis and optimization for the PRV, the PSV model is validated by comparing the results with data obtained from a real test-bench. The sensitivity of the PSV pressure response with regard to the structural parameters is investigated by using Sobol׳s method. Finally, simulations and experimental investigations are performed on the optimi…

OptimizationOptimal design0209 industrial biotechnologyEngineeringAerospace Engineering02 engineering and technologyPressure regulatorClutch actuatorClutch controllaw.invention020901 industrial engineering & automationPressure reducing valve0203 mechanical engineeringlawControl theorySolenoid valveClutchSensitivity (control systems)Civil and Structural EngineeringAutomatic transmissionbusiness.industryMechanical EngineeringComputer Science Applications1707 Computer Vision and Pattern Recognition020302 automobile design & engineeringComputer Science ApplicationsAutomatic transmission; Clutch actuator; Optimization; Pressure reducing valve; Sensitivity analysis; Control and Systems Engineering; Signal Processing; Civil and Structural Engineering; Aerospace Engineering; Mechanical Engineering; Computer Science Applications1707 Computer Vision and Pattern RecognitionControl and Systems EngineeringAutomatic transmissionSignal ProcessingSensitivity analysisbusinessActuatorMechanical Systems and Signal Processing
researchProduct

Implicit regulation for automotive variators

2001

A well-known practice uses mechanical variators to realize the so-called continuously variable transmissions (CVTs) for automotive application. A remarkable problem for one of the most used CVTs is given by the hydraulic control of the axial thrust on the half-pulleys that is necessary for torque transmission. It involves a heavy decrease in transmission efficiency. In the present paper, the possible production of the required axial thrust by a simple spring to eliminate hydraulic losses is analysed. It is shown that the power capacity of such a regulated variator is near to the maximum possible, and the belt torque loss is always considerably lower than the sum of the belt and pump losses…

mechanical transmissionEngineeringVariatorAutomatic transmissionContinuously variable transmissionsbusiness.industryMechanical Engineeringthrust regulationAerospace EngineeringThrustBelt driveSettore ING-IND/13 - Meccanica Applicata Alle Macchineautomotive applicationlaw.inventionPower (physics)Control theorylawsplit power transmissionsLimit (music)TorquebusinessSlip (vehicle dynamics)
researchProduct