Vehicle robbery prevention method and device
First Claim
1. A theft prevention method for a vehicle having a battery, a main switch connected to said battery and a theft prevention device actuated upon operation of the main switch and stopped when the main switch is released, said method comprising the steps of reading the battery voltage immediately after the main switch is turned on, determining if the battery voltage is no larger than a given value after the releasing operation of the main switch, and issuing a warning if the battery voltage is no larger than the given value.
2 Assignments
0 Petitions
Accused Products
Abstract
This invention provides a theft prevention method and device for a vehicle in which before a battery voltage falls to the extent that releasing of a theft prevention system is impossible, the battery voltage is read and a warning is issued of a drop in the battery voltage so that a user is allowed to take measures such as replacement or charging of the battery and the system can be released without trouble for the start of the engine at the time of driving.
A theft prevention method for a vehicle, allowing that a main switch 5 connected to a battery 6 is turned on to actuate theft prevention means 8, 9, 10 and operation of the theft prevention means is stopped through releasing operation, wherein a battery voltage is read immediately after the main switch 5 is turned on, it is determined whether or not the battery voltage is no larger than a given value after the releasing operation, and a warning is issued if the battery voltage is no larger than the given value.
7 Citations
19 Claims
- 1. A theft prevention method for a vehicle having a battery, a main switch connected to said battery and a theft prevention device actuated upon operation of the main switch and stopped when the main switch is released, said method comprising the steps of reading the battery voltage immediately after the main switch is turned on, determining if the battery voltage is no larger than a given value after the releasing operation of the main switch, and issuing a warning if the battery voltage is no larger than the given value.
- 6. A theft prevention method for a motorcycle, using an acceleration sensor for detecting the acceleration in at least one direction of an X-X and a Y-Y axis, said method comprising calculating an average value of the sensor outputs for a given time B from the moment when a given time A has elapsed since the start of a new theft monitoring condition, setting the average value as a reference value, and determining a theft condition based on differences between sensor outputs.
- 10. A theft prevention device for a motorcycle comprising a dual-axis acceleration sensor for detecting an acceleration along each of X-W and Y-Y axes, sensor-output reading means for reading the output of said acceleration sensor, a theft determinator for determining whether or not there exists a theft condition based on the read sensor output, and warning means for issuing a warning when it is determined that there exists a theft condition, said theft determinator calculating a resultant operational output value A of sensor outputs of the X-X and Y-Y axes, based on differences between sensor outputs X, Y of the X-X and Y-Y axes and given reference values Xs, Ys for the respective X-X and Y-Y axes, a theft condition is determined, based on the vibration of the vehicle if the operational output value A is larger than a given threshold value S and the theft condition is determined based on the tilt of the vehicle, if the operational output value A is smaller than the given threshold value S.
- 16. A theft prevention system for a vehicle comprising a first theft prevention device by comprising an immobilizer for checking an ID code of a transponder incorporated in a key and controlling prohibition of engine start and removal of the prohibition, and a second theft prevention device comprising a device for detecting a theft condition and a warning device a communication device communicating signals between said first and the second theft prevention devices transmitting an operating signal of one theft prevention device to the other theft prevention device to enable the other theft prevention device to operate.
Specification