Method for monitoring an apparatus connected to a communication channel
First Claim
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1. A method for monitoring operation of an apparatus connected to a vehicle communication channel in a vehicle for failure of the apparatus, the method comprising:
- determining, by a monitoring apparatus, that the apparatus is in an operating state based on determining an interval of time between two messages output by the apparatus to the vehicle communication channel is shorter than or the same as a particular time period;
receiving, at the monitoring apparatus, a monitoring logoff message output by, the apparatus onto the vehicle communication channel;
determining, by the monitoring apparatus, that the apparatus is in an operating state in response to receipt of the monitoring logoff message as a most recently received message output by the apparatus onto the vehicle communication channel;
excluding, by the monitoring apparatus, the apparatus that output the monitoring logoff message from monitoring until the apparatus outputs a further message onto the vehicle communication channel to reduce a volume of communication on the vehicle communication channel; and
determining, by the monitoring apparatus, that the apparatus is in a failed state in response to the message most recently output by the apparatus not comprising the monitoring logoff message and more time than the particular time period having elapsed since the output of the message most recently output by the apparatus onto the vehicle communication channel,wherein the determination of the state of the apparatus is based on the message most recently output by the apparatus onto the vehicle communication channel and also absence of messages received from the apparatus via the vehicle communication channel during the particular time period.
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Abstract
Method for monitoring an apparatus connected to a communication channel wherein the method is connected to a communication channel in a vehicle. When an interval of time between two messages that are output by the apparatus is shorter than or the same as a determined period, the method determines is the apparatus is in a correct state. The apparatus can output a monitoring sign-out message to the communication channel. When a message recently output by the apparatus includes the monitoring sign-out message, it is determined that the apparatus is in a correct state.
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Citations
15 Claims
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1. A method for monitoring operation of an apparatus connected to a vehicle communication channel in a vehicle for failure of the apparatus, the method comprising:
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determining, by a monitoring apparatus, that the apparatus is in an operating state based on determining an interval of time between two messages output by the apparatus to the vehicle communication channel is shorter than or the same as a particular time period; receiving, at the monitoring apparatus, a monitoring logoff message output by, the apparatus onto the vehicle communication channel; determining, by the monitoring apparatus, that the apparatus is in an operating state in response to receipt of the monitoring logoff message as a most recently received message output by the apparatus onto the vehicle communication channel; excluding, by the monitoring apparatus, the apparatus that output the monitoring logoff message from monitoring until the apparatus outputs a further message onto the vehicle communication channel to reduce a volume of communication on the vehicle communication channel; and determining, by the monitoring apparatus, that the apparatus is in a failed state in response to the message most recently output by the apparatus not comprising the monitoring logoff message and more time than the particular time period having elapsed since the output of the message most recently output by the apparatus onto the vehicle communication channel, wherein the determination of the state of the apparatus is based on the message most recently output by the apparatus onto the vehicle communication channel and also absence of messages received from the apparatus via the vehicle communication channel during the particular time period. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for a vehicle, the apparatus comprising:
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an interface for connecting the apparatus to a vehicle communication channel of the vehicle for monitoring for failure of the apparatus; and a processing unit that outputs a monitoring logoff message onto the vehicle communication channel via the interface to indicate that the apparatus is subsequently intended to be excluded from monitoring until the apparatus outputs a further message onto the vehicle communication channel to reduce a volume of communication on the vehicle communication channel, wherein the processing unit is further configured to determine that the apparatus is in an operating state based on a determination that an interval of time between two messages output by the apparatus to the vehicle communication channel is shorter than or the same as a particular period, wherein there is a determination that the apparatus is in a failed state in response to the message most recently output by the apparatus not comprising the monitoring logoff message and more time than the particular time period having elapsed since the output of the message most recently output by the apparatus onto the vehicle communication channel, and wherein the determination of the state of the apparatus is based on the message most recently output by the apparatus onto the vehicle communication channel and also absence of messages received from the apparatus via the vehicle communication channel during the particular time period. - View Dependent Claims (9, 10, 11)
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12. A monitoring apparatus for monitoring for failure of an apparatus connected to a vehicle communication channel in a vehicle, the monitoring apparatus comprising:
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an interface for connecting the monitoring apparatus to the communication channel; and a processing unit which determines that the apparatus is in an operating state based on a determination that an interval of time between two messages output by the apparatus to the vehicle communication channel is shorter than or the same as a particular time period, and that the apparatus is in an operating state when a message most recently output by the apparatus comprises a monitoring logoff message, wherein the processing unit excludes the apparatus that has output the monitoring logoff message from the monitoring until the apparatus outputs a further message onto the communication channel to reduce a volume of communication on the vehicle communication channel, wherein there is a determination that the apparatus is in a failed state in response to the message most recently output by the apparatus not comprising the monitoring logoff message and more time than the particular period having elapsed since the output of the message most recently output by the apparatus onto the vehicle communication channel, and wherein the determination of the state of the apparatus is based on the message most recently output by the apparatus onto the vehicle communication channel and also absence of messages received from the apparatus via the vehicle communication channel during the particular time period. - View Dependent Claims (13, 14)
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15. A vehicle, comprising:
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a vehicle communication channel for connecting apparatuses in the vehicle; at least one apparatus comprising; a first interface for connecting the apparatus to the vehicle communication channel of the vehicle; and a first processing unit that outputs a monitoring logoff message onto the vehicle communication channel via the first interface to indicate that the apparatus is subsequently intended to be excluded from monitoring until the apparatus outputs a further message onto the vehicle communication channel to reduce a volume of communication on the vehicle communication channel; and a monitoring apparatus for monitoring the at least one apparatus connected to the vehicle communication channel in the vehicle for failure of the at least one apparatus, the monitoring apparatus comprising; a second interface for connecting the monitoring apparatus to the vehicle communication channel; and a second processing unit which determines that the at least one apparatus is in an operating state based on a determination that an interval of time between two messages output by the at least one apparatus to the vehicle communication channel is shorter than or the same as a particular time period, and that the at least one apparatus is in the operating state when a message most recently output by the apparatus comprises a monitoring logoff message, wherein there is a determination that the apparatus is in a failed state in response to the message most recently output by the apparatus not comprising the monitoring logoff message and more time than the particular time period having elapsed since the output of the message most recently output by the apparatus onto the vehicle communication channel, and wherein the determination of the state of the apparatus is based on the message most recently output by the apparatus onto the vehicle communication channel and also absence of messages received from the apparatus via the vehicle communication channel during the particular time period.
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Specification