Electricity: motive power systems – Automatic and/or with time-delay means – Movement – position – or limit-of-travel
Patent
1999-02-04
2000-09-05
Ip, Paul
Electricity: motive power systems
Automatic and/or with time-delay means
Movement, position, or limit-of-travel
318286, 318466, 318468, 318266, G05B 500
Patent
active
061148229
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for the contactless approach of the lower stop position of a motor vehicle window operated by extraneous force according to the preamble of patent claim 1. It ensures that even with changed influencing factors, such as varying operating voltage, changed friction conditions, ageing of the technical system, a contactless stop position is reached and held without noticeably restricting the pane stroke which is available. The method is also in a position to compensate relevant tolerances of the vehicle doors, window raising mechanism and motor (deviations in the motor characteristic line).
According to the usual structural requirements when a window pane is in the lowest possible position the top edge of the window pane should as far as possible no longer protrude from the window shaft of the vehicle body. This generally requires the window pane to move down into the immediate vicinity of the lower mechanical stop. The contactless approach of the lower stop, also called `Soft-Stop` has the advantage that the otherwise normal noises which are connected with the pane striking the stop are avoided. Furthermore the window raising system is stressed less heavily which allows weight-saving dimensions to be used.
Methods are known for the contactless lowering of a window pane of a motor vehicle into it lower end positions by evaluating sensor signals of a motorised drive which are supplied to an electronic evaluation unit. The electronic evaluation unit uses the sensor signals as counting pulses whereby a certain pane position is allocated to each sum value. In order to avoid a collision with the lower mechanical stop as the window pane is lowered, it is generally necessary owing to the slowing-down behaviour of the displacement system whereby the window pane still also moves down slightly even after the drive has been switched off, to switch off the drive just before the window pane reaches the lower ideal position.
AS a result of the production-conditioned tolerances when fixing the electronically controllable stroke it is necessary to proceed from the shortest of the possible displacement paths available since otherwise there is the risk of collision with the lower stop. Thus the stroke which is actually available is not fully utilised. Where the distance from the lower stop is measured too short this leads during travel as a result of further lowering movements, for example through vibrations or shocks, to impact noises.
The known solutions are not in a position to detect and compensate changed influencing factors. This relates both to the system deficiency which increases as the system ages and to temporary condition changes such as increased or reduced operating voltage or friction conditions of the window pane changed through temperature fluctuations and/or the effects of dampness. In the event of increased cable loosening the drive must use up an increasingly greater positioning path for compensation which is no longer available for carrying out a window movement. That is the overall number of the counting pulses (signals) which represents the pane stroke between the upper and lower end position is to an increasingly greater part allocated to setting movements of the drive which lead to displacement movements of the window pane. Thus the window pane can no longer drop down completely in the shaft.
From DE 195 14 954 A a method is known for controlling the movement of vehicle windows which detects the window position and on reaching the end positions (when the window is fully closed or fully opened) the blocking of the motor. On approaching the end positions the actual position values are compared with earlier position values (previous displacement cycles) and the stroke restriction is adapted when required. Thus approaching the end positions is possible with secondary current but the features of the blocking state, more particularly the high system voltage, are not positively affected thereby. Minimising the tensioning of the window raising device can hereby not be reached.
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REFERENCES:
patent: 5170108 (1992-12-01), Peterson et al.
patent: 5399950 (1995-03-01), Lu et al.
patent: 5483135 (1996-01-01), Parks
patent: 5539290 (1996-07-01), Lu et al.
patent: 5740630 (1998-04-01), Medebach
Kalb Roland
Ubelein Jorg
Brose Fahrzeugteile GmbH & Co. KG Coburg
Ip Paul
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