Control system
First Claim
1. A control system comprising:
- a first control unit operable to perform data communications; and
a second control unit operable to perform data communications, wherein the first control unit and the second control unit share data with each other, wherein the first control unit comprises;
a first transmitter operable to transmit data to the second control unit when a position of a first switch connected to a power supply is detected as being changed to an off position; and
a power supply cutoff circuit operable to cut off the power supply to the first control unit after the transmission of the data to the second control unit by the first transmitter is completed, and wherein the second control unit comprises;
a first storage controller operable to store the data transmitted from the first control unit in a first storage unit; and
a power switching circuit operable to detect a change of the first switch to the off position and to switch the power of the second control unit to backup power.
2 Assignments
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Accused Products
Abstract
A control system enables a considerable decrease in electric power consumption of backup power, leading to effective prevention of a dead battery, while data in each control unit which need be maintained even after power is turned off is properly maintained. An ECU has a first transmitter to transmit data which need be maintained to an ECU for storage when a change in position of an IGSW connected to a battery to the off position is detected, and a power supply cutoff circuit to cut off the power supply to the other ECUs after the completion of the transmission of data to the ECU for storage by the first transmitter, wherein the ECU for storage has a first storage controller to store the data transmitted from the other ECUs in RAM, and a power switching circuit to detect the change of the IGSW to the off position and switch the power of the ECU for storage to the backup power.
15 Citations
15 Claims
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1. A control system comprising:
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a first control unit operable to perform data communications; and
a second control unit operable to perform data communications, wherein the first control unit and the second control unit share data with each other, wherein the first control unit comprises;
a first transmitter operable to transmit data to the second control unit when a position of a first switch connected to a power supply is detected as being changed to an off position; and
a power supply cutoff circuit operable to cut off the power supply to the first control unit after the transmission of the data to the second control unit by the first transmitter is completed, and wherein the second control unit comprises;
a first storage controller operable to store the data transmitted from the first control unit in a first storage unit; and
a power switching circuit operable to detect a change of the first switch to the off position and to switch the power of the second control unit to backup power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A control system, wherein multiple control units can mutually perform data communications, comprising:
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at least one control units among the multiple control units, having a nonvolatile storage unit which can maintain therein a memory contents using backup power, wherein control units of the multiple control units, other than the at least one control unit, transmit the memory contents to the at least one control unit having the nonvolatile storage unit when a power supply to the system is shut off.
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Specification