| 摘要 |
PURPOSE:To save operator's trouble by a method wherein a winker is cancelled when a direction is largely turned more than a predetermined difference of bearings and an actuation direction of the winker is identical with a direction of actual course changing, in a winker cancellation device applying terrestrial magnetism. CONSTITUTION:Signals X and Y of a terrestrial magnetism sensor 11 passing through an amplifier 12 and sample hold circuits 13 and 13' measure a slewing angle at a differential amplifier 15 and 15', compare them to voltage of a setting device 17 equivalent to a slewing angle to be cancelled at a comparator 16 causing generation of a cancellation signal, and enter into an OR gate 19. On the other hand the signal X and Y are differentiated at an operation circuit 21, and become H level only when it is coincident with a direction of actual course changing and an actuation direction of a winker switch 14 at a decision circuit 13, which, if not, block the cancel signal from an OR gate 19 at an AND circuit 20. |
