Kraftfahrzeug-Anti-Diebstahlgerät zur Auswertung einer von einem Schlüssel übertragenen Identifizierung zur Motoranlassung

摘要

When an ignition switch detects that a key rotor of an ignition key cylinder has been turned to the accessory position by a key, a controller energizes a primary coil to cause it to output a high-frequency signal. In the key, a secondary battery is charged with a constant DC voltage generated from an AC voltage induced across a secondary coil. A transmission circuit is powered by the secondary battery, and allowed by a timer circuit to transmit a radio signal including an identification code during a predetermined period after the high-frequency signal is received by the key. Alternatively, the controller energizes the primary coil plural times with a cycle consisting of predetermined outputting and pause periods if the transmitted identification code does not coincide with a preset identification code at the first comparing attempt.