Maintenance-friendly immobilization system
First Claim
1. In a vehicle immobilization system for a motor vehicle, having an anti-theft control device for performing a user-legitimization check and having at least one function control device for controlling the operation of an engine component, the function control device being connected to the anti-theft control device by a line system, the improvement wherein the function control deviceincludes a circuit which processes digital signals and only permits startup of the function control device after a regular unlocking communication with the antitheft control device has taken place, andfurther includes bypass means (204 through 220) which permit an atypical unlocking of the function control device by a device which is external to the vehicle if the regular unlocking communication is omitted, which external device acts directly on the function control device, bypassing the anti-theft control device.
1 Assignment
0 Petitions
Accused Products
Abstract
A motor vehicle immobilization system having an anti-theft control device (13) and a function control device (10, 11) which is released by a regular unlocking communication with the anti-theft control device (13). To permit simple maintenance of individual engine function units, the function control device (10, 11) has bypass means (204 through 220) which permit an atypical unlocking of the function control device (10, 11) by the external device (19). The bypass means (204 through 220) include a time-delay device (206, 218) which, during atypical unlocking, only releases the function control device (10, 11) after the passage of a predetermined delay time (TF).
11 Citations
6 Claims
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1. In a vehicle immobilization system for a motor vehicle, having an anti-theft control device for performing a user-legitimization check and having at least one function control device for controlling the operation of an engine component, the function control device being connected to the anti-theft control device by a line system, the improvement wherein the function control device
includes a circuit which processes digital signals and only permits startup of the function control device after a regular unlocking communication with the antitheft control device has taken place, and further includes bypass means (204 through 220) which permit an atypical unlocking of the function control device by a device which is external to the vehicle if the regular unlocking communication is omitted, which external device acts directly on the function control device, bypassing the anti-theft control device.
Specification