Window heater controlling apparatus providing a gradual heating

Details Window heater controlling apparatus providing a gradual heating Window heater controlling apparatus providing a gradual heating

1989-03-28

1991-12-03

Paschall, Mark H.

Electric heating

Heating devices

Combined with diverse-type art device

219492, 219505, 219501, 323238, 323901, H05B 102, B60L 102

Patent

active

050702297

ABSTRACT:
In a window heater controlling apparatus used in an automobile, a heater control unit including a microcomputer is employed to detect a heater-ON condition and thereafter to control the heating voltage of the alternator in such a manner that the heating voltage is gradually increased up to the rated heating voltage at the beginning of the heater control operation. This heater control operation can be performed by duty ratio control of the switching transistor.

REFERENCES:
patent: 4307440 (1981-12-01), Inoue et al.
patent: 4357524 (1982-11-01), Apfelbeck et al.
patent: 4621313 (1986-11-01), Kiteley
patent: 4730097 (1988-03-01), Campbell et al.
patent: 4868486 (1989-09-01), Shinoda

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