Window opening and closing apparatus

Details Window opening and closing apparatus Window opening and closing apparatus

1998-05-19

2000-08-08

Ro, Bentsu

Electricity: motive power systems

Motor-reversing

Automatic and/or with time-delay means

318266, 318469, B60J 117, E05F 1516

Patent

active

061006580

ABSTRACT:
A rotational speed sensor generates pulses having a period proportional to the speed of a motor, while a pulse period calculator section calculates the period of the pulses. A jamming determination section calculates the motor load based on the pulse period and detects that an object is jammed when the load exceeds a predetermined threshold. Once it has been judged than an object is jammed, a drive control section stops and controls the motor for reverse rotation, thereby releasing the object. A door opening and closing detection section further detects the opening or closing operation of a door which is one disturbance factor. If the door is opened or closed, an inhibit control section inhibits jamming judgment for a predetermined period of time thereafter. This prevents an incorrect judgment due to the opening or closing of the door.

REFERENCES:
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patent: 5351439 (1994-10-01), Takeda et al.
patent: 5436539 (1995-07-01), Wrenbeck et al.
patent: 5459379 (1995-10-01), Takeda et al.
patent: 5483133 (1996-01-01), Takabe et al.
patent: 5525876 (1996-06-01), Flippi
patent: 5689160 (1997-11-01), Shigematsu et al.
patent: 5734245 (1998-03-01), Terashima et al.
patent: 5801501 (1998-09-01), Redelberger

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