| 摘要 |
First and second code comparators are sequentially responsive to keypad-entered first and second different codes. The first code enables operation of the engine. When a distance sensing device generates a signal representing traversal of a preset distance, this blocks the further operation of the engine based on the first code. The driver must enter a second code upon receipt of a warning that engine disablement is imminent. To prevent carjacking in which the driver is forcibly ejected from a car having its engine running in a normal operating mode, the driver surreptitiously trips a hidden switch as he exits the car. The hidden switch, which would typically be operated after both codes have been entered and with the engine running, resets the system. After a preset delay which is provided to permit the owner to reach safety from a carjacker, the system once again requires that the second code be inputted. The second code needs to be re-entered to keep the engine running. By this time the car will be sufficiently distant from the owner, and actuation of an alarm such as a siren encourages the carjacker to abandon the car at the time of such disablement. |
