Controller area network wake-up system and method
First Claim
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1. A controller area network, comprising:
- a CAN bus operable to facilitate CAN communications;
a plurality of communication controllers in electrical communication with said CAN bus,wherein each communication controller is operable in an active state to participate in CAN communications among said plurality of communication controllers via said CAN bus, andwherein each communication controller is inoperable in an inactive state to participate in CAN communications among said plurality of communication controllers via said CAN bus; and
a CAN wake-up controller in electrical communication with said CAN bus and at least one of said communication controllers,wherein said CAN wake-up controller is operable to switch said at least one of said communication controllers to the active state in response to an application of a non-interfering communication biasing signal to said CAN bus, andwherein said CAN wake-up controller is operable to switch said at least one of said communication controllers to the inactive state in response to a termination of the application of the non-interfering communication biasing signal to said CAN bus.
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Abstract
A controller area network employs a CAN bus for facilitating CAN communications among a plurality of communication controllers switched to an active state. The controller area network further employs a CAN wake-up controller for switching one or more communication controllers to the active state in response to an application of a non-interfering communication biasing signal to said CAN bus. Upon a termination of the application of a non-interfering communication biasing signal to said CAN bus, the CAN wake-up controller switches the communication controller(s) to an inactive state for impeding CAN communications by communication controller(s) via the CAN bus.
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Citations
21 Claims
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1. A controller area network, comprising:
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a CAN bus operable to facilitate CAN communications; a plurality of communication controllers in electrical communication with said CAN bus, wherein each communication controller is operable in an active state to participate in CAN communications among said plurality of communication controllers via said CAN bus, and wherein each communication controller is inoperable in an inactive state to participate in CAN communications among said plurality of communication controllers via said CAN bus; and a CAN wake-up controller in electrical communication with said CAN bus and at least one of said communication controllers, wherein said CAN wake-up controller is operable to switch said at least one of said communication controllers to the active state in response to an application of a non-interfering communication biasing signal to said CAN bus, and wherein said CAN wake-up controller is operable to switch said at least one of said communication controllers to the inactive state in response to a termination of the application of the non-interfering communication biasing signal to said CAN bus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of operating a controller area network employing a plurality of communication controllers and a CAN bus, the method comprising:
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applying a non-interfering communication biasing signal to the CAN bus; switching a first communication controller to an active state in response to the application of the non-interfering communication biasing signal to the CAN bus, wherein the first communication controller switches to an active state to thereby participate in CAN communications among the plurality of communication controllers via said CAN bus; receiving an electrical communication of a wake-up signal indicative of a requirement for the first communication controller to be switched to the active state; and switching a second communication controller to the active state in response to the electrical communication of the wake-up signal whereby the second communication controller generates the non-interfering communication biasing signal in response being switched to the active state. - View Dependent Claims (19)
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20. A controller area network, comprising:
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means for applying a non-interfering communication biasing signal to a CAN bus; means for switching a first communication controller to an active state in response to the application of the non-interfering communication biasing signal to the CAN bus, wherein the first communication controller switches to an active state to thereby participate in CAN communications among the plurality of communication controllers via said CAN bus; means for receiving an electrical communication of a wake-up signal indicative of a requirement for the first communication controller to be switched to the active state; and means for switching a second communication controller to the active state in response to the electrical communication of the wake-up signal whereby the second communication controller generates the non-interfering communication biasing signal in response being switched to the active state. - View Dependent Claims (21)
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Specification