Patent ID: 7973649

Claim:
A method of unauthorized vehicle motion sensing and alarm with the aid of in vehicle acceleration sensors, that comprises, monitoring the presence or absence of predetermined periodic radio-frequency pulse transmissions from an authorized source in the vicinity of the vehicle; in the event that such transmissions are present, receiving the transmissions in the vehicle; and disarming or de-activating the acceleration sensors; in the absence of such reception, arming or activating the acceleration sensors in the vehicle to test for any acceleration of the vehicle by unauthorized motion thereof over predetermined time period samples; in the event such vehicle acceleration is detected by the accelerator sensors, sending a wireless alarm message for so informing the vehicle owner; after a further predetermined longer period of time during said activating of the acceleration sensors wherein no motion of the vehicle has been detected, disarming or deactivating the acceleration sensors to put them in a sleep mode and conserve activation energy; upon the advent of vibration detection at the vehicle during such sleep mode, awakening and re-arming or re-activating the acceleration sensors; and again disarming or de-activating the acceleration sensors upon the later advent of the reception of said transmissions in the vehicle.