Electricity: motive power systems – Automatic and/or with time-delay means – Movement – position – or limit-of-travel
Patent
1998-01-15
1999-12-14
Martin, David
Electricity: motive power systems
Automatic and/or with time-delay means
Movement, position, or limit-of-travel
318286, 318446, 318447, 318461, 49 28, G05B 500
Patent
active
060022280
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an apparatus for electronically monitoring an adjusting drive arranged in a vehicle.
DE-A 44 16 803 already discloses a method and an apparatus for the adjustment of power-operated parts, in particular, in a vehicle body. Therein at least two redundantly operating sensor systems are used, thus improving the reliability for the collision recognition. This serves to prevent the jamming of objects in the power-operated parts.
SUMMARY OF THE INVENTION
The apparatus according to the invention electronically monitors an adjusting drive arranged in a vehicle for adjusting the position of a movable part and it offers the advantage that, by way of the targeted selection of two sensor systems, their properties contribute within a position-dependent anti-jam strategy to prevent faulty triggering, on the one hand, and to enhance the safety in a danger zone, on the other hand. A combination of a switching strip, which performs electrical switching responsive to the application or removal of a force or pressure, with an incremental path transmitter of an adjustable movable part is advantageous because a jam situation which is hazardous to persons is present when a person is disposed between the switching strip receiving the part and the moved part. It is therefore advantageous to monitor the end position as well as the edge of the part. Precisely that is accomplished with the method according to the invention. Regulations such as, for example, FMVSS 118 also differentiate in a position-dependent manner with regard to the safety requirements.
If, for example, the side window of a vehicle is almost completely open, it is unlikely that a jam situation occurs which is hazardous to persons. A faulty triggering caused by unintended touching of the switching strip is probably the rule. In order to reduce the probability of faulty triggering in this region, the anti-jam system only responds, halting closing of the window, if a jam is detected on the part of the incremental sensor monitoring the adjustable part, namely the window, and on the part of the switching strip.
In contrast, the anti-jam system must respond quickly if, for example, the side window is about to close. If a person's fingers, for example, happen to touch the switching strip at that time, the adjusting drive which moves the part must be switched off immediately to prevent possible bruising. Safety is increased if, in this case, the anti-jam system responds when either the switching strip or the incremental sensor detects a jam.
Based on the position-dependent evaluation, the incremental sensor lends itself as a sensor system, with the signals of the incremental sensor being used to determine the position of the part as well as to determine the jamming of the part, for example, via an evaluation of the rotational speed change.
The switching strip lends itself as second sensor system because it monitors the end position of the adjustable part in an economical manner.
Owing to a combination of the two sensor elements in the present invention, an anti-jam system is realized which, on the one hand, is economical and, on the other hand, enhances safety and reduces faulty triggering.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be described in greater detail below by way of reference to the accompanying drawings, wherein:
FIG. 1 shows the apparatus and the division of the position regions; and
FIG. 2 schematically illustrates the functioning of the apparatus.
DETAILED DESCRIPTION OF THE INVENTION
In FIG. 1, starting from an open state, a part 11, for example, a window, first traverses the second position region 24 in the direction x until it gets into the first position region 23 at a region boundary 22. In the closed state, the part is disposed in the end position 21 which is a part of a frame 20 and is preceded by a switching strip 12.
In FIG. 2, an adjusting drive 10 moves the part 11. An incremental sensor 13 emits an incremental signal 15 to a control arrangement 14 which includes an
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Martin David
Robert & Bosch GmbH
Spencer George H.
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