Electricity: motive power systems – Motor-reversing – Automatic and/or with time-delay means
Reexamination Certificate
1999-01-13
2001-02-27
Sircus, Brian (Department: 2837)
Electricity: motive power systems
Motor-reversing
Automatic and/or with time-delay means
C318S467000, C318S476000
Reexamination Certificate
active
06194855
ABSTRACT:
BACKGROUND INFORMATION
The present invention relates to a displacement drive with an obstruction prevention function for movable parts such as, for example, windows and sunroofs in motor vehicles.
In a displacement drive of this kind known from German Published Patent Application No. 37 36 400 A1, a decrease in the rotation speed or velocity of the drive is performed in order to achieve a predefined spring rate in specific displacement ranges so as to lower the kinetic energy. The movable part is moved by way of a drive motor, through an obstruction hazard range in which foreign objects may become jammed between the movable part and a stationary part, into a closed position. Because of unavoidable delays in signal processing and the inertia of the mechanically moved part, the foreign object can be jammed between the moved part and the stationary part despite a safety apparatus representing the obstruction prevention function. To prevent this, provision is made in the case of this known displacement drive for the displacement velocity during closing of the movable part to be diminished in the obstruction hazard range. The actual obstruction prevention function can then, if applicable, halt the movable part momentarily and possibly reverse the direction of motion.
With this known displacement drive, the decrease in velocity takes place in stages, i.e. operation is switched in one step from a high stage to a low stage of the closing velocity. Switching down abruptly in this fashion can cause the obstruction prevention function to respond incorrectly, and moreover lengthens the closing time.
SUMMARY OF THE INVENTION
According to the present invention, a displacement drive with an obstruction prevention function provides a continuous transition from a high closing velocity to a specific low closing velocity, with an optimized closing time. An incorrect response of the obstruction prevention function is thus reliably prevented.
According to the present invention, this is achieved in principle in that within the predefined range before the “closed” position is reached, the rotation speed and/or the output of the drive is reduced in accordance with a predefined functional relationship. The reduction to a minimum rotation speed or minimum output takes place within a specific position range. This minimum rotation speed or minimum output is reached at a specific position before the “closed” position. The minimum rotation speed or minimum output is substantially constant. The reduction in the rotation speed and/or output of the drive can be predefined in accordance with an arbitrarily selectable functional relationship. Smooth transitions can thereby be implemented.
In an advantageous embodiment of the displacement drive according to the present invention, the reduction in rotation speed is linear. The effort for determining the support points is low.
A further embodiment according to the present invention is based on a reduction in accordance with an exponential function. This allows abrupt changes in rotation speed and/or output to be avoided.
According to a particularly advantageous embodiment of the present invention, the reduction to the minimum rotation speed or minimum output in accordance with a predefined functional relationship is accomplished over a constant position range, the rate of reduction changing as a function of the instantaneous supply power level, in particular the supply voltage.
According to a particularly advantageous further alternative embodiment of the present invention, the reduction to the minimum rotation speed or minimum output is accomplished over a variable position range, the starting point thereof changing as a function of the respective instantaneous supply power level, in particular the supply voltage.
In a particularly advantageous embodiment of the present invention, the necessary minimum rotation speed or minimum output is ascertained empirically, such that sufficiently high closing forces are still guaranteed under all conditions, in particular of temperature and humidity.
In an advantageous embodiment of the present invention, control of the rotation speed or output of the preferably electrical drive is accomplished using semiconductor components, in particular linear controllers or clock-pulse controllers having a variable pulse-to-interpulse ratio.
In a particularly advantageous embodiment of the present invention, provision is made for the displacement drive to be usable together with a circuit for preventing foreign objects from being jammed between the moved part and fixed stop in the “closed” position.
According to an advantageous embodiment of this development of the present invention, the respective known slope of the reduction in accordance with a predefined functional relationship in the rotation speed and/or output of the drive can be taken into account as a correction factor in calculating the reduction in rotation speed due to obstruction events.
In a particularly advantageous embodiment of the present invention, there is provided for the correction an adaptive memory in which the controlled reduction in rotation speed and/or output is stored as a slight slowing.
According to a further advantageous embodiment of the displacement drive according to the present invention, in order to improve the analysis for the obstruction prevention function, the resolution for position sensing is increased by using an EXOR member between two Hall sensors, and/or by using a multiply polarized ring magnet.
A further advantageous embodiment of the present invention provides that when a very small opening width, for example<4 mm, is reached, the rotation speed and/or output can be raised back up to the greatest possible value in order to achieve maximum closing force, in particular in the area of rubber seals.
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Bosch Technical Information, Comined Ignition And Gas Injection System MOTRONIC (1 987 722 011, kh/vdt-Sep. 1985-De). Mentioned in specification.
Aab Volker
Heib Johannes
Lochmahr Gunnar
Kenyon & Kenyon
Robert & Bosch GmbH
Sircus Brian
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