Apparatus for detecting pinching of an object in a power window

Details Apparatus for detecting pinching of an object in a power window Apparatus for detecting pinching of an object in a power window

1999-03-23

2000-03-07

Ip, Paul

Electricity: motive power systems

Plural diverse motor controls

Motor-reversing

318268, 318466, 318468, 318282, B60J 116

Patent

active

060344954

ABSTRACT:
An apparatus for detecting the pinching of an object of a power window which stops the detection of the pinching when a normal pulse edge interval of a two-phase pulse is not obtained is disclosed. The apparatus comprises a motor 4 for opening/closing a window, a motor driving unit 3, a pulse generating unit 5 for generating a two-phase pulse, an MCU 2, and a switching arrangement 1. The MCU 2 detects a motor torque from an interval between pulse edges of the two-phase pulse at the time of opening and closing the window and compares the motor torque with a preset addition value. When the motor torque exceeds the addition value, the MCU 2 determines the occurrence of the pinching of an object and stops or reverses the driving of the motor 4. A timer 14 for resetting time each time the pulse edge in the two-phase pulse arrives is disposed in the MCU 2. When a pulse edge in the two-phase pulse arrives and the next pulse edge does not arrive within the set time of the timer 14, the MCU 2 stops the determination of the presence or absence of the pinching of an object in the window.

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