Multi-processor system in a motor vehicle
First Claim
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1. A multi-processor system for a motor vehicle for carrying out control functions, the system comprising:
- at least two processors;
said processors each including means for detecting a fault of the other one of said processors during the operation of said system and means for generating a reset signal to trigger a restart of said system during the operation thereof;
means for supplying said reset signal to each of said processors at the beginning of an operating cycle when power is switched on to start said system;
said reset signal being supplied to said processors to carry out a first step sequence to define a cold start routine when power is switched on and to carry out a second step sequence to define a warm start routine when restarting said system;
each of said processors including means for distinguishing between when power is switched on and a restart based on changeable identifiers;
each of said processors having a changeable identifier which is set to a first pregiven value by said reset signal and which is set to a second pregiven value by said reset signal after said system is started;
means for permitting said processors to exchange their identifiers; and
,each of said processors including means for comparing its own identifier to the identifier of the other processor to distinguish between when said power is switched on and a restart and for selecting the corresponding one of said step sequences.
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Abstract
The invention is directed to a multi-processor system which includes at least two processors. The system carries out a first sequence of steps when power is switched on and, for a restart during operation, executes a second sequence of steps. The system distinguishes between power on and a restart and selects, the corresponding step sequence. In addition, a check is provided as to whether the number of resets of a processor has exceeded a pregiven threshold. In this case, a processor is transferred into the standby state for the operating cycle which is then running.
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Citations
10 Claims
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1. A multi-processor system for a motor vehicle for carrying out control functions, the system comprising:
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at least two processors; said processors each including means for detecting a fault of the other one of said processors during the operation of said system and means for generating a reset signal to trigger a restart of said system during the operation thereof; means for supplying said reset signal to each of said processors at the beginning of an operating cycle when power is switched on to start said system; said reset signal being supplied to said processors to carry out a first step sequence to define a cold start routine when power is switched on and to carry out a second step sequence to define a warm start routine when restarting said system; each of said processors including means for distinguishing between when power is switched on and a restart based on changeable identifiers; each of said processors having a changeable identifier which is set to a first pregiven value by said reset signal and which is set to a second pregiven value by said reset signal after said system is started; means for permitting said processors to exchange their identifiers; and
,each of said processors including means for comparing its own identifier to the identifier of the other processor to distinguish between when said power is switched on and a restart and for selecting the corresponding one of said step sequences. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification