DETECTING MECHANISM FOR AUTO-OUTPUT OF ON-VEHICLE SWITCH

摘要

PURPOSE:To surely detect only the signal delivered from a 1st switch button by setting a detecting element for auto-stop output in series between the motor terminal of the 1st switch button and a connector terminal which collects the output signals of each switch. CONSTITUTION:The detecting elements 93 having small resistance value are set between motor terminals 9a of a 1st switch button doubling an auto-switch and a connector terminal 92 which collects output signals of each switch. Then the junctures are detected among those terminals 93 and 91 by a 1st comparator 94 and a 2nd comparator 95 which share a set potential equivalent to a lock current. A logic circuit 96 is formed by connecting in series the outputs of both comparators 94 and 95 with each other in the order of diodes. A delay circuit 98 consists of a CR circuit which holds the auto-stop output for a fixed period of time and a 3rd comparator 97 having hysteresis. A transistor amplifying circuit 99 drives an electromagnet 35 and uses the output of the circuit 98 as its input.