Patent ID: 7656278
Filing Date: 2010-02-02
Classification: B60R

Abstract:
1. A theft prevention apparatus of a leisure vehicle equipped with a rider's seat which is open to the outside, the theft prevention apparatus comprising: a vehicle receiver mounted in the vehicle and including a vehicle transmitter configured to transmit a request signal by radio at predetermined travel distance intervals during travel of the vehicle; a portable transmitter including a transmitter receiver configured to receive the request signal which is transmitted by radio from the vehicle transmitter of the receiver, the portable transmitter being configured to transmit a reply signal by radio to the vehicle receiver in response to the request signal, the reply signal being received by the vehicle receiver; a controller coupled to the vehicle receiver through a signal line or by radio; and an alarm device mounted in the vehicle and configured to indicate an alarm to inform the rider that the portable transmitter has been lost; wherein the controller is configured to determine whether or not the vehicle receiver has received the reply signal transmitted from the portable transmitter within a predetermined time after the vehicle receiver has transmitted the request signal by radio to the portable transmitter, and to execute control to cause the alarm device to indicate the alarm when the controller determines that the vehicle receiver does not receive the reply signal within the predetermined time; and wherein the controller is configured to reduce a transmission interval of the request signal which is transmitted by radio from the vehicle transmitter, when the vehicle receiver does not receive the reply signal which is to be transmitted in response to the request signal.