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A security system for an automotive vehicle having an engine is operatively connected between engine running electrical components that are connected to an electrical power source and a lock switch having at least two operative positions. The security system has a lock switch operator having a memor

A security system for an automotive vehicle having an engine is operatively connected between engine running electrical components that are connected to an electrical power source and a lock switch having at least two operative positions. The security system has a lock switch operator having a memory device carried thereon with a first security code stored in the memory device. A theft control module having a memory storing a second security code is operatively connected between the switch and the engine running electrical devices. The theft control module operates to first permit the engine running electrical components to enable the starting of the engine and then to compare the first and second security codes. Before starting the engine, a counter is compared to a predetermined number so that the engine starting is limited to only a predetermined number of attempts. The engine is disabled if the number of attempts exceeds the predetermined number. If the predetermined number is not exceeded the security codes are checked. Upon finding the first security code not equal to the second security code, the engine running electrical components are disconnected from the electrical power source to disable the engine. The system also may have a feature to allow the electronic engine controller to generate a code and send the code to the theft control module. The theft control module calculates a response based upon a secret algorithm. The electronic engine controller maintains the engine enabled if a code it calculates based on the same secret algorithm is equivalent to the response calculated in the theft control module.

대표청구항 ▼

A security system for an automotive vehicle having an engine, said security system operatively connected between engine running electrical components and an electrical power source, said security system comprising: a lock switch having an operative position; a lock switch operator; a memory device c

A security system for an automotive vehicle having an engine, said security system operatively connected between engine running electrical components and an electrical power source, said security system comprising: a lock switch having an operative position; a lock switch operator; a memory device carried on said lock operator having a first security code; an engine control module coupled to said engine running electrical components and having a counter for counting an attempted start count; and a theft control module having a memory storing a second security code, said theft control module operatively connected to said lock switch for receiving said first security code, said theft control module comparing said first and second security codes and transmitting the result of said comparison to said engine control module; wherein said engine control module compares an attempted start count to a predetermined number, and wherein if said attempted start count is less than said predetermined number then said engine control module energizes said engine running electrical components to enable the starting of said engine and if said theft control module subsequently indicates that said first and second security codes are not equal then disconnecting said engine running electrical components from said electrical power source thereby discontinuing operation of said engine; and wherein said engine control module transmits a challenge code to said theft control module, wherein said theft control module calculates a response code according to a predetermined formula and transmits said response code to said engine control module, wherein said engine control module calculates a comparison code and compares said response code to said comparison code, and wherein said engine control module disables said engine if said response code is not equal to said comparison code.