Patent ID: 9121687
Filing Date: 2015-09-01
Classification: E05F,E05Y,G01B,H03J

Abstract:
1. A pinch detection device at an opening/closing section, the pinch detection device comprising: a sensor for detecting displacement of the opening/closing section of a vehicle, the opening/closing section being opened/closed by a motor; a time counter for counting a relative time on a time axis adjusted according to a fluctuation in a power supply voltage; and a pinch detector for detecting pinch of a foreign matter at the opening/closing section based on a change in a relative speed obtained from a change in the displacement on a basis of the relative time, wherein the sensor is a pulse generator for generating a one-phase pulse based on a rotation of the motor and has a closed position detecting switch to detect a closed state and its vicinity of the opening/closing section, and the pinch detector detects the pinch when a current position of the opening/closing section is not near a reference position, and wherein the pulse generator is a signal processing circuit for extracting a ripple generated in a voltage or an electric current fed to the motor so as to generate a pulse equivalent to a pulse encoder according to a rotation angle of the motor.