Method for operating an electrical drive unit
AssigneeConti Temic microelectronic GmbH
InventorsErwin Kessler, Wolfgang Schulter
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Abstract
The invention relates to a simple, economical and reliable method for providing anti-jamming protection. According to said method, the excess force—the difference between the driving force and the friction force—is compared with a trigger threshold. To this end, the curve of the friction force of the current actuation process, which is dependent on the actuation path of the electrical drive unit, is compared to the curve of the friction force of at least one previous actuation process and the trigger threshold value is modified according to how the friction force curves correspond. The invention also relates to a method for providing anti-jamming protection for an electrical drive unit for window lifting drives.
Claims14
A method for operating an electrical drive unit, wherein anti-jamming protection is realized by comparing an excess force (FO) defined as the difference between a driving force (FA) and a friction force (FR), with a trigger threshold value (FS), comprising the following steps:
- a) comparing a characteristic curve of said friction force (FR), which depends on an operating distance (s) of the electrical drive unit, of a present driving operation (BV1) with at least one characteristic curve of a friction force (FR) of a past driving operation (BV2 . . . BVn),
- b) and varying said trigger threshold value (FS) in response to the conformity between the characteristic curve of the friction force (FR) of the present driving operation (BV1) and at least one past driving operation (BV2 .. . BVn).
Dependencies are inferred from the claim text.