Wiper control device

Details Wiper control device Wiper control device

1998-07-30

1999-12-07

Gaffin, Jeffrey

Electrical transmission or interconnection systems

Vehicle mounted systems

Automobile

318444, 318DIG2, B60L 100, H02P 104

Patent

active

059988835

ABSTRACT:
A wiper control device includes a wiper switch having a variable resistor which is switched to the respective resistance value corresponding to the respective operation mode of the wiper apparatus. An interface circuit is provided with a reference resistor and a capacitor. A microcomputer is provided with a reference charging port for changing the capacitor through the reference resistor, a detective charging port for changing the same capacitor through the variable resistor switched into various resistance values corresponding to the respective operation modes and a reading port for reading as to whether the capacitor is changed up to a predetermined potential level. The microcomputer determines the selected operation mode on the basis of a relative value calculated from the time required for charging the capacitor through the reference resistor by the reference charging port and the time required for charging the capacitor through the variable resistor of the wiper switch by the detective charging port.

REFERENCES:
patent: 4689535 (1987-08-01), Tsunoda et al.
patent: 5254916 (1993-10-01), Hopkins
patent: 5519258 (1996-05-01), Stroven et al.
patent: 5525879 (1996-06-01), Wainwright

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