Multiplex transmission apparatus
First Claim
1. A multiplex transmission apparatus which comprises a plurality of communication nodes connected to each other via a multiplex transmission path, and a plurality of electrical components to be controlled by the plurality of communication nodes, each of the plurality of communication nodes being set in one of an operative state, an inoperative state, and an operable state, comprising:
- first detection means for detecting an ON/OFF state of an ignition key switch;
means for monitoring operative/inoperative states of the electrical components;
means for setting a predetermined reference time in accordance with the monitoring result;
second detection means for detecting a change in state of the electrical components within the reference time; and
control means for, when the ignition key switch is in an OFF state, and it is detected that the state of the electrical components has not changed within the reference time, setting the communication node associated with control of the electrical components in the inoperative state.
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Accused Products
Abstract
When it is detected that the state of an electrical component connected to a communication node has not changed in the OFF state of an ignition key switch, it is determined that a vehicle equipped with the multiplex transmission apparatus is in a parking state, and the communication node is forcibly shifted to a sleep state, thereby preventing consumption of battery power due to a dark current supplied to the communication node in the sleep state.
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Citations
17 Claims
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1. A multiplex transmission apparatus which comprises a plurality of communication nodes connected to each other via a multiplex transmission path, and a plurality of electrical components to be controlled by the plurality of communication nodes, each of the plurality of communication nodes being set in one of an operative state, an inoperative state, and an operable state, comprising:
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first detection means for detecting an ON/OFF state of an ignition key switch; means for monitoring operative/inoperative states of the electrical components; means for setting a predetermined reference time in accordance with the monitoring result; second detection means for detecting a change in state of the electrical components within the reference time; and control means for, when the ignition key switch is in an OFF state, and it is detected that the state of the electrical components has not changed within the reference time, setting the communication node associated with control of the electrical components in the inoperative state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A multiplex transmission apparatus which comprises a plurality of communication nodes connected to each other via a multiplex transmission path, and a plurality of electrical components to be controlled by the plurality of communication nodes, each of the plurality of communication nodes being set in one of an operative state, an inoperative state, and an operable state, comprising:
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means for monitoring operative/inoperative states of the electrical components; means for setting one of a plurality of predetermined reference times in accordance with the monitoring result; detection means for detecting a change in state of the electrical components within the predetermined reference time; and control means for, when an ignition key switch is in an OFF state, and it is detected that the state of the electrical components has not changed within the predetermined reference time, setting the communication node associated with control of the electrical components in the inoperative state, wherein the predetermined reference time is set in correspondence with the number of said electrical components which are in the operative state. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification