Method and system for controlling electric loads with high reliability

• US 5,270,578 A
• Filed: 01/07/1991
• Issued: 12/14/1993
• Est. Priority Date: 01/08/1990
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Yamamura, Hirohisa
• Primary Examiner(s): Pellinen, A. D.
• Assistant Examiner(s): ELMS, RICHARD T
• Application Number:
  US07/637,787
• Time in Patent Office: 1,072 Days
• Field of Search: 307/38, 307/39, 307/34, 307/27, 307/29, 307/9.1, 307/10.1
• US Class Current: 307/39
• CPC Class Codes: H02J 1/10 Parallel operation of dc sources

Abstract

A system and method for controlling plural load with high reliability, comprising plural control devices for respectively controlling the plural electric loads, plural switches for respectively giving ordering signals to the control devices to control the respective loads, and a monitor circuit for detecting an out of order control device and generating ordering signals for selecting another control device which is not out of order based on the superiority of the other electric load and the ordering signals from the switches which correspond to the other control device to change from the control device which is out of order to the other control device.

Claims

1. A system for controlling plural loads with high reliability, comprising

plural control devices which are provided corresponding to the respective loads for respectively controlling a corresponding one of the plural loads,

plural switches for switching over a control device connected to the load from one of the plural loads to another of the plural loads, and

a monitor circuit for detecting at least one of the control devices which is out of order, for selecting another of the control devices which is out of order, for selecting another of the control devices which is not out of order based on superiority among the loads and for actuating the plural switches so as to disconnect said one of the control devices from the loads corresponding to said one of the control devices and to switch over said one of the control devices from the load having been connected to said one of the control devices to the load corresponding to said other of the control devices.

2. A system for controlling plural loads as defined in claim 1, characterized in that

said plural control devices respectively have plural control programs for controlling plural loads which are corresponding to the control device being out of order and the other control device.

3. A system for controlling plural loads as defined in claim 1, characterized in that

said plural control devices respectively supply electric power to the electric loads from an electric source.

4. A system for controlling plural loads as defined in claim 1, characterized by

said monitor circuit for selecting the other control device based on the superiority which is defined by using frequency of use of the other control device or importance of the load corresponding to the other control device.

8. A system for controlling plural loads as defined in claim 1 or 5, characterized in that

said plural control devices are divided into plural groups including the plural control devices which are near each other and the monitor circuit selects the other control device in the same group.

9. A system for controlling plural loads as defined in claim 1 or 5, characterized in that

said monitor circuit detects the trouble of the control device, and selects or actuates the other control device using a bus line which is commonly connected between the plural control devices and plural loads.

10. A system for controlling plural loads as defined in claim 1 or 5, characterized in that

said monitor selects said other control devices based on the superiority of the load which is not controlled by the corresponding control device.

5. A system for controlling plural loads with high reliability, comprising

plural control devices which are provided corresponding to the respective loads for respectively controlling a corresponding one of the plural loads,

plural switches for switching over a control device connected to the load from one of the plural loads to another of the plural loads, and

a monitor circuit for detecting at least one of the control devices which is out of order, for selecting another of the control devices which is not out of order based on superiority among the loads and for actuating the plural switches so as to disconnect said other of the control devices from one of the loads corresponding to the other control device and to switch over the load corresponding to said one of the control devices between said one of the control devices and said other of the control devices in a time sharing mode.

6. A system for controlling plural loads as defined in claim 5, characterized in that

said plural control devices respectively have plural control programs for controlling plural loads which are corresponding to the control device being out of order and the other control device.

7. A system for controlling plural loads as defined in claim 5, characterized in that

said plural control devices respectively supply electric power to the electric loads from an electric source.

11. A method for controlling plural loads respectively corresponding to plural control devices with high reliability, comprising the steps of

detecting at least one of the control devices which is out of order,

selecting another of the control devices which is not out of order based on superiority among the electric loads, and

disconnecting said other of the control devices from one of the loads corresponding to the other control device and switching over the load corresponding to said one of the control devices from said one of the control devices to said other of the control devices.

13. A method for respectively controlling plural loads as defined in claim 11 or 12, characterized in that sad superiority is based on the load which is not controlled y the corresponding control device.

12. A method for controlling plural loads respectively corresponding to plural control devices with high reliability, comprising the steps of

detecting at least one of the control devices which is out of order,

selecting another of the control devices which is not out of order based on superiority among the electric loads, and

disconnecting said other of the control devices from one of the loads corresponding to the other control device and switching over the load corresponding to said one of the control devices between said one of the control devices and said other of the control devices in a time sharing mode.