Electricity: measuring and testing – Plural – automatically sequential tests
Patent
1986-02-21
1987-10-27
Karlsen, Ernest F.
Electricity: measuring and testing
Plural, automatically sequential tests
324158R, G01R 3100
Patent
active
047032588
DESCRIPTION:
BRIEF SUMMARY
STATE OF THE ART
The invention is based on a method for testing controller devices, in particular in motor vehicles, which perform functions in dependency on sensor signals and, in the event of a function error, store an error data ward and upon interrogation convert the stored data word into an error signal or a sequence of signals.
A process and a device for selftesting of micro computer controlled switch devices, in particular in motor vehicles, is already known from PCT/DE No. 82/00 149. the switch devices perform predetermined functions in dependency on signals from a sensor and store a corresponding data word when an error is recognized. For issuing the error the data word is converted in a signal sequence or voltage and the error is determined by voltage metering. This is preferably performed in that a testing adapter is connected between the sensor lines and the switch device. A voltage meter may be connected with this testing adapter which then indicates this signal sequence or voltage. A defined type of error is assigned to a defined voltage. Thereby, with a simple commercially available voltage meter a thorough diagnosis of a complicated system may be performed. In furtherance it is known to optically indicate this signal sequence by means of blinking codes, so that a diagnosis is possible without a voltage meter.
ADVANTAGES OF THE INVENTION
The method in accordance with the invention for testing of controller devices with the characterizing features of the main claim is advantageous in that due to a single excitation of the controller devices, which are connected on the excitation line, a communication with a diagnosis tester or for the issuance of a blinking code at an error indicating device is caused by the excitation signal without a mutual interference of the controller devices.
Particular advantageous embodiments in accordance with the invention are stated in the subclaims. The calling of the next controller device can be performed by a communication from the last controller device which had performed an error issue. Thus, an automatic testing of the next controller device is provided without the intervention of a testing person. However, it is also advantageous that the testing person calls the next controller device for an error issue either on the testing device, or on the error issue device, in order to indicate that its error diagnosis for the first controller device is finished. A particularly advantageous and simple method for distributing the priorities among the controller devices consists in that each controller device applies a priority signal to the excitation line before the issue of an error, whereby duration of the priority signal is proportional to the predetermined priority of the controller device. Thus, one recognizes the controller device with the highest priority and that it was the last one which had its priority signal applied to the excitation line and now begins with the error issue. Therefore, no data transmission between the controller devices or the test device are required in this method, furthermore less additional hardware expense is needed. The excitation line is unused during the error issue, so that it can be used for the interruption of the controller device which presently performs an error issue. Thereby, it is particularly advantageous when the next controller device is made ready for an error issue by means of an excitation signal on the excitation line.
DRAWING
One exemplified embodiment of the invention is illustrated in the drawings and is explained in more detail in the subsequent description.
FIG. 1 illustrates a structural diagram,
FIG. 2 a signal vs. time diagram for explaining the mode of operation and;
FIG. 3 a circuit diagram for a connection of the test or excitation line to a controller device.
DESCRIPTION OF THE EXEMPLIFIED EMBODIMENT
Three controller devices S1, S2, S3 are illustrated in FIG. 1, which are connected to an internal combustion engine 4 with connecting lines 11, 12, 13. The connecting lines represent signal lines
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"Automatic Line Tester", by Canard, IBM Tech., Disc. Bull., vol. 9, #9, 2/67, p. 1099.
"Priority Arbiter", by Lee et al., IBM Tech. Disc. Bull., vol. 24, #11B, 4/82, pp. 5856-5857.
Burns W.
Karlsen Ernest F.
Robert & Bosch GmbH
Striker Michael J.
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