Patent ID: 7471190
Filing Date: 2008-12-30
Classification: B60R

Abstract:
1. An anti-theft vehicle alarm system comprising: an acceleration sensor that detects acceleration applied to a vehicle in at least one direction; control means that performs an alarm process for detecting a possible theft of the vehicle based on a tilt angle of the vehicle, the control means including processing means that calculates a tilt angle of the vehicle from output of the acceleration sensor and outputs an drive signal in accordance with the tilt angle; a first power source that generates a first voltage from a battery voltage of the vehicle and supplies the first voltage to the control means; a second power source that generates a second voltage from the battery voltage and supplies the second voltage to the acceleration sensor; and sound means that produces an audible alarm in response to the drive signal, wherein the control means further includes monitor means for monitoring a third voltage that depends on the second voltage and stop means for stopping the processing means when the third voltage is outside a predetermined voltage range.