Siemens Aktiengesellschaft

Dietmar Peters

Johann Schmid

Richard Merl

Horst Jouvenal

Herbert Ziegler

Claus Brudigam

The proper functionality of a first processor is checked with a second processor. The second processor thereby provides the first processor with a start value and a computation rule. The first processor carries out the specified computation rule using the predetermined start value, and returns a result to the second processor. The second processor checks the result against a stored comparison result. The computation rule is defined such that the basic instructions which are used for programming the first processor are checked.

Method of checking the operability of a processor

The functionality of a first processor is checked with a second processor. A data word with a specified number of data bits is supplied to the first processor from a second processor at specified time intervals. Each data bit is assigned a function. Having processed a function, the first processor inverts the associated data bit and, at the end of a time slice, passes the data word to the second processor, which checks the transferred data word.

Method for checking a first processor performing functions by a data

A control device of the internal combustion engine has a first arithmetic unit and a second arithmetic unit. The arithmetic units process a control program with a first, second and third program level. In the second program level an actuation signal is monitored, and a first emergency operating function is activated in the first program level if the second program level has detected an implausibility of the actuation signal. The third program level is caused to carry out a second emergency operating function if, while the first emergency operating function is being carried out in the first program level, the implausibility of the actuation signal continues to be detected.

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Wuppertal, Germany

Dietmar Peters