Automobile wiper driving apparatus

Details Automobile wiper driving apparatus Automobile wiper driving apparatus

2005-07-12

2005-07-12

Masih, Karen (Department: 2837)

Electricity: motive power systems

Periodic, repetitious or successive operations control of...

Variable periods or intervals between controlling operations

C318S443000, C318S280000

Reexamination Certificate

active

06917173

ABSTRACT:
The wiper driving apparatus module includes: a motor12for driving a wiper unit; a wiper ECU11for driving the motor12; a deceleration mechanism (including gears). The two brush DC motor is employed and driven by a pulse width modulation (PWM) signal, in place of the conventional three brush motor wherein brushes are changed in accordance with a wiper operation speed. Therefore, the number of windings is only a number required for a high speed operation of the wiper unit. The high speed operation is implemented by 100% duty PWM signal, while the low speed operation is implemented by reducing the duty. The PWM signal duty is changed in response to a rainfall, windshield surface state and wind pressure which cause the wiping speed fluctuation.

REFERENCES:
patent: 4663575 (1987-05-01), Juzwik et al.
patent: 4733142 (1988-03-01), Bicknell
patent: 5254916 (1993-10-01), Hopkins
patent: 2001/0041956 (2001-11-01), Wong et al.
patent: 2001-95286 (2001-04-01), None
patent: 2001-315620 (2001-11-01), None
patent: 2002-37035 (2002-02-01), None

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