Multiplex transmission system in a vehicle
First Claim
1. A multiplex transmission system for transmitting data indicating an on/off state of a switch, comprising:
- a first power distributing unit connected to a first load;
a second power distributing unit connected to a second load;
a first signal line connected between the switch and said first power distributing unit, said first signal line providing a first signal indicating the on/off state of the switch, said first power distributing unit controlling the first load in accordance with the on/off state of the switch indicated by the first signal;
a second signal line connected between the switch and said second power distributing unit, said second signal line providing a second signal indicating the on/off state of the switch; and
a multiplex transmission line connected between said first and second power distributing units, said first power distributing unit providing a third signal to said second power distributing unit over said multiplex transmission line, indicating the on/off state of the switch,wherein, when either the second signal or the third signal indicates that the switch is in an on state, said second power distributing unit determines that the switch is in the on state and controls the second load in accordance with the on state of the switch,and when said second power distributing unit fails to receive the third signal, said second power distributing unit controls the second load in accordance with the on/off state indicated by the second signal.
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Accused Products
Abstract
A multiplex transmission system in a vehicle, for transmitting data indicating an on/off state of an ignition switch, includes first and second power distributing units receiving first and second signals over first and second signal lines, respectively, indicating the on/off state of the switch. The first power distributing unit controls a first load in accordance with the on/off state of the switch indicated by the first signal. The first power distributing unit provides a third signal to the second power distributing unit over a multiplex transmission line indicating the on/off state of the switch. When either the second signal or the third signal indicates that the switch is in an on state, the second power distributing unit controls the second load in accordance with the on state of the switch. When the second power distributing unit fails to receive the third signal, the second power distributing unit controls the second load in accordance with the on/off state indicated by the second signal.
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Citations
12 Claims
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1. A multiplex transmission system for transmitting data indicating an on/off state of a switch, comprising:
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a first power distributing unit connected to a first load; a second power distributing unit connected to a second load; a first signal line connected between the switch and said first power distributing unit, said first signal line providing a first signal indicating the on/off state of the switch, said first power distributing unit controlling the first load in accordance with the on/off state of the switch indicated by the first signal; a second signal line connected between the switch and said second power distributing unit, said second signal line providing a second signal indicating the on/off state of the switch; and a multiplex transmission line connected between said first and second power distributing units, said first power distributing unit providing a third signal to said second power distributing unit over said multiplex transmission line, indicating the on/off state of the switch, wherein, when either the second signal or the third signal indicates that the switch is in an on state, said second power distributing unit determines that the switch is in the on state and controls the second load in accordance with the on state of the switch, and when said second power distributing unit fails to receive the third signal, said second power distributing unit controls the second load in accordance with the on/off state indicated by the second signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of transmitting data indicating an on/off state of a switch in a multiplex transmission system, comprising the steps of:
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providing a first signal on a first signal line to a first power distributing unit indicating the on/off state of the switch; controlling a first load with said first power distributing unit in accordance with the on/off state of the switch indicated by the first signal; providing a second signal on a second signal line to a second power distributing unit indicating the on/off state of the switch; providing a third signal from said first power distributing unit to said second power distributing unit over a multiplex transmission line, indicating the on/off state of the switch; when either the second signal or the third signal indicates that the switch is in an on state, controlling a second load with said second power distributing unit in accordance with the on state of the switch; and when said second power distributing unit fails to receive the third signal, controlling the second load with said second power distributing unit in accordance with the on/off state indicated by the second signal. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification