Data logging in a motor vehicle
First Claim
1. A method of reading messages which are sent over a data bus in a motor vehicle between electronic units, comprising:
- at least one communications network based on at least one data bus to which several electronic units are connected by means of a bus interface, at least one data interface for connecting the communications network with an external data processing unit, at least one cyclically overwritable, volatile storing means for the storing of messages which were sent in the communications network, at least one monitoring unit having an executable program which examines the messages stored in the volatile storing means for selected, parameterizable attributes, at least one definable trigger event, whose occurrence is monitored by the executable program, and upon whose occurrence the cyclical overwriting of the volatile storing means is stopped for at least as long until the data content of the volatile storing means is transferred to a second, non-volatile storing means.
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Accused Products
Abstract
The invention relates to a method for logging messages on a data bus and temporarily storing the sent messages in a cyclically overwritable volatile storing means. The temporarily stored messages can be examined in a targeted manner for attributes of interest by using a verification program. A storage of the temporarily stored messages in a non-volatile second storing means can be initiated by means of definable trigger events that, for example, are formed from individual or a number of attributes of the messages. To this end, the occurrence of the defined trigger event is determined by a monitoring unit, and the data content of the volatile storing means are subsequently transferred into the storage locations of the non-volatile storing means. The principal advantage achieved with the above method resides in the possibility of backtracking the bus traffic. The exchanged messages may be backtracked and thus provide for the possibility to determine from which process and from which control device was the error message sent on the bus. This assists in a decisive manner in the error-seeking in complex communications networks. By means of the backtracking of the error message or with the analysis as to which message has eventually triggered an error in the communications network, it may be ascertained which process is responsible for the error and which program step triggered it. The error-seeking in the software programming of complex control device combinations is thereby decisively facilitated.
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Citations
11 Claims
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1. A method of reading messages which are sent over a data bus in a motor vehicle between electronic units, comprising:
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at least one communications network based on at least one data bus to which several electronic units are connected by means of a bus interface, at least one data interface for connecting the communications network with an external data processing unit, at least one cyclically overwritable, volatile storing means for the storing of messages which were sent in the communications network, at least one monitoring unit having an executable program which examines the messages stored in the volatile storing means for selected, parameterizable attributes, at least one definable trigger event, whose occurrence is monitored by the executable program, and upon whose occurrence the cyclical overwriting of the volatile storing means is stopped for at least as long until the data content of the volatile storing means is transferred to a second, non-volatile storing means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification