APPARATUS FOR CONTROLLING SWITCH OF STEERING WHEEL OF CAR

摘要

PURPOSE:To prevent an erroneous action so as to improve the operability of a steering wheel, by not closing an electric circuit for load even when the steering wheel becomes in contact with an operation part of switches during the turning of the steering wheel not less than a prescribed turning angle. CONSTITUTION:A turn sensor section 5 outputs a signal to a turn judging circuit section 6 when the steering wheel 1 is within a prescribed turning angle. According to the presence or absence of said signal the turn judging circuit section 6 controls signals sent through an encoding circuit section 3 and an optical coupler section 4 from various switches 2 provided to the wheel 1 so as to control the driving of the load 8 via a decoding circuit section 7. The turn judging circuit section 6 consists of a resistance-voltage converting circuit 6a which receives the change of resistance due to the contact of a turn base 5a of a turn sensor section 5 with a contact needle and converts it to the change of voltage, and a gate circuit 6b for controlling an output signal from an optical coupler 4 according to the presence or absence of the input from said circuit 6a.