Wiper apparatus with reversing motor protected from overload

Details Wiper apparatus with reversing motor protected from overload Wiper apparatus with reversing motor protected from overload

1991-02-15

1992-02-04

Shoop, Jr., William M.

Electricity: motive power systems

Plural diverse motor controls

Motor-reversing

318DIG2, 1525013, H02P 300

Patent

active

050862600

ABSTRACT:
A wiper apparatus is provided with a wiper motor, an overcurrent detection circuit, a timer actuated according to a signal output from the overcurrent detection circuit at the time of detecting the overcurrent flowing in the wiper motor and a controller for actuating a wiper blade reciprocatingly by rotating the wiper motor in the reverse direction every time the wiper blade arrives at a turning position, and rotating the wiper motor in the reverse direction when the overcurrent detection circuit continues to detect the overcurrent for a period predetermined by the timer. According to this invention, it is possible to prevent the wiper motor from the burning out even if the wiper blade of the wiper apparatus is restricted by obstacles such as snow lying on the vehicle body.

REFERENCES:
patent: 3596511 (1971-08-01), Hart
patent: 4234833 (1980-11-01), Barrett
patent: 4280160 (1981-07-01), Mori
patent: 4562387 (1985-12-01), Lehnhoff
patent: 4625157 (1986-11-01), Phillimore
patent: 4628234 (1986-12-01), Mizuta et al.
patent: 4823059 (1989-04-01), Compeau et al.

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