METHOD FOR OPERATING A BUS CONTROL UNIT AND BUS CONTROL UNIT
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Abstract
A watchdog function is performed for those messages which are used by a controller in a CAN bus to keep the other controllers active. All emitted keep-active messages are read again by the emitting controller itself and are checked for the presence of a reason. In the absence of such a reason, a restart is carried out.
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Citations
12 Claims
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1-4. -4. (canceled)
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5. A method for operating a first controller which is connected to a Controller Area Network (CAN) bus, comprising:
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emitting a keep-active message from the first controller to maintain communication with at least a second controller connected to the CAN bus, by a method comprising; using at least a first bit in the keep-active message to keep the second controller active; and using at least a second bit in the keep-active message to communicate a reason for keeping the second controller active, the second bit being used during proper operation of the first controller; reading at the first controller, all keep-active messages emitted by the first controller and checking at the first controller, whether a reason has been communicated; and in the absence of the reason, resetting at least one of a software function and a component function. - View Dependent Claims (6, 7, 8)
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9. A first controller to connect to a Controller Area Network (CAN) bus, comprising:
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a keep-active device to emit keep-active messages to keep second controllers on the CAN bus active, the keep-active messages being emitted to the second controllers; and a check device to read all keep-active messages emitted by the first controller, to check whether a reason for keeping the second controllers active has been communicated in the keep-active messages and, in the absence of the reason, to reset at least some functions of the first controller. - View Dependent Claims (10, 11, 12)
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Specification