Control device for operating a wiper motor

Details Control device for operating a wiper motor Control device for operating a wiper motor

1997-11-20

1999-09-28

Gaffin, Jeffrey

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 25, 361115, 361 93, H02H 700

Patent

active

059598174

ABSTRACT:
A control device for operating a wiper motor (10) which utilizes the typical path of the wiper motor current (Im) with cyclically recurring minima during the detection of an overload of the wiper motor (10) caused by blockage or tightness of the wiper. During this process, a storage element (C) that integrates the motor current (Im) is short-circuited at least twice within a wiping cycle (Tw) during normal operation so that the transfer of the admissible overload from a half of a wiping cycle (Tw/2) to the following half of the wiping cycle (Tw/2) is prevented and the limit value (G) for the shut-down of the wiper motor (10) is not reached through accumulation of the admissible overload.

REFERENCES:
patent: 4717985 (1988-01-01), Demeyer
patent: 5666066 (1997-09-01), Jo

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