192 clutches and power-stop control – Vortex-flow drive and clutch – With brake
Patent
1991-05-15
1993-03-02
Braun, Leslie A.
192 clutches and power-stop control
Vortex-flow drive and clutch
With brake
192 331, F16D 4102
Patent
active
051901307
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns a process for regulating a clutch situated within a power train between an input and an output shaft. A sensor device, including regulating equipment, is provided in the power train for detecting a rotation-rate difference .DELTA..omega. which, in accordance with a controlled variable detected by the sensor device, controls a correcting variable which is to be fed to the clutch and affect the speed difference .DELTA..omega..
2. Description of the Related Art
A process of the above kind was disclosed in German Patent 31 21 749. Torsional vibrations, due to rotational irregularity of a drive unit that actuates the input shaft, which are transmitted to the output shaft, are prevented by means of a regulated slip condition of the clutch. Depending on the difference in the speed or rate or rotation of the input shaft, which is a dimension of the torsional vibration, a speed difference between the input and the output shafts causes a certain condition of slippage in the clutch. Here the speed difference between the input and the output shafts must always assume a higher value than the difference of speed or rate of rotation of the input shaft. The realization of such a regulation process is relatively expensive, since the relation of the speed or rotation-rate difference of the input shaft to the speed difference between input and output shafts is to be laid down as a characteristic line in the desired value pickup. The rotation-rate difference of the input shaft is measured. The process is further carried out by means of a device which has a value unit which adjusts the actuation pressure in the clutch. Component parts of the value unit are a directional valve and a solenoid valve that pilot controls the directional valve and is operated by pulse-width modulation. The solenoid valves of this construction have the disadvantage of being dependent on the temperature of their control pressure.
Therefore, the invention is based on the problem of eliminating said disadvantages and thus providing a simple process for regulation of a clutch which can be carried out at low cost in control engineering and construction.
SUMMARY OF THE INVENTION
In a process of the above mentioned kind, said problem is solved by the fact that the regulation equipment has a comparator unit which compares an actual value of the rotation-rate difference detected in the power train behind the clutch with a present stable limit value and, upon reaching or exceeding said limit value, the rotation-rate difference .DELTA..omega. is limited to the limit value by modifying a correcting variable of the clutch. Said limit value can be detected in test series for differently designed power trains and motor vehicles as a dimension of the rotation-rate difference .DELTA..omega. in which a vibration stimulation in the power train, and in the structural parts connected therewith, assumes a magnitude in which buzzing and rattling noises do not yet occur within the power train and structural parts. A regulation according to the process of the invention in which only the rotation-rate difference signal is compared with the limit value requires only a small expense in control engineering.
The invention refers to a process for regulation of a clutch which is situated within a power train of a motor vehicle between an input shaft connected with an internal combustion engine and an output shaft connected with a transmission unit, including a pickup for determining a differential speed .DELTA.n of input and output shafts, a sensor device for detecting a rotation-rate difference .DELTA..omega. and regulating equipment which, according to the controlled variable detected by the pick-up, controls the correcting variable to be fed to the clutch and which affects the speed difference .DELTA.n.
The problem on which the invention is based is solved in the process by the fact that to a desired value pickup, coordinated with the regulating equipment, there are fed operational parameters of the
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Gruhle Wolf-Dieter
Maier Wolfgang
Rowe Gerald
Thomas Christian
Braun Leslie A.
Whitelaw Nicholas
Zahnradfabrik Friedrichshafen AG
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