JP2000347707A - Method for transmitting signal for dual system and single system coexisting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform signal transmission between a dual system controller and a single system controller with a few signal lines. SOLUTION: In this dual system and single system coexisting system which consists of a dual system controller 1 consisting of two controllers 4 controlling the same control object 3 and a single system controller 2 that selects one signal between signals from the respective controllers 4 of the controller 1 and transmits a feedback signal from the object 3 to the respective controllers 4 of the controller 1, the signals from the respective controllers 4 to the single system device 2 and a signal from the device 2 to the respective controllers 4 respectively consist of two kinds of signals, the signal levels of the two kinds of signals are set to mutually different areas and the signals are respectively transmitted through one signal line 11 to 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transmitting a signal between two systems when a controlled object is controlled by a mixed system of a double system and a single system.

[0002]

2. Description of the Related Art In a control requiring high reliability, such as an aircraft engine, a control device for controlling a control target (for example, an actuator) is provided in duplicate, and the reliability of the control device is checked to obtain a high reliability. Control is performed using signals from the control device.

FIG. 2 shows an example of a control system in which a dual system and a single system are mixed. The dual system control device includes two control devices that control the same control target. The single system controller has a selector for selecting a control signal from two controllers and controlling a control target, and a failure determiner for analyzing a feedback signal from the control target to determine a failure. Each control device of the dual system control device sends a control signal for controlling the control target and a failure signal indicating its own soundness by self-diagnosis to the selection unit of the single system control device. The selection unit examines the failure signals from both control devices and selects a sound control signal. Further, the failure determination unit of the single system controller analyzes the feedback signal to determine whether a failure has occurred in the control target, and transmits a failure signal and a feedback signal indicating the result of the study to each controller.

[0004]

As described above, since two types of signals are transmitted between each control device and the selection unit and between the failure determination unit and each control device, a signal is transmitted between each control device and the selection unit. As shown in FIG. 2, two signal lines were provided between the failure determination unit and each control device. Since there are many signal lines as described above, there are problems such as a large number of connector terminals, an increase in the size of the connector, an increase in cable weight, and the necessity of an additional circuit.

The present invention has been made in view of the above-mentioned problems, and has as its object to perform signal transmission between a dual system control device and a single system control device with a small number of signal lines.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, the same control target is controlled.
And a control unit that selects one of the signals from each control unit of the dual control unit to control the control target, and outputs a feedback signal from the control target to the double control unit. Signals from each control device to a single system device and signals from the single system device to each control device in a dual system and a single system mixed system consisting of a single system device transmitted to each control device of the control device Are composed of two types of signals, respectively.
Set the signal level of each type of signal to a different area,
Each signal is transmitted by one signal line.

[0007] The signal level is divided into two regions, one of the two types of signals is allocated to one region, and the other signal is allocated to the other region. When a signal is transmitted in one area, no signal is transmitted in the other area, and when a signal is transmitted in the other area, no signal is transmitted in one area. Two types of signals can be transmitted. As a result, it is possible to transmit a signal from one control device to the single system device by one signal line, and to transmit a signal from the single system device to one control device by one signal line. it can.

According to the second aspect of the present invention, the single-system control device analyzes a feedback signal from the control target by selecting one of the signals from each control device to control the control target. A failure determination unit for determining failure,
A signal from each control device to the selection unit includes a control signal and a failure signal, and a signal from the failure determination unit to each control device includes a feedback signal and a failure signal.

The control unit transmits a control signal for controlling the control target and a failure signal indicating the soundness of its own state, so that the selection unit can determine which control device has a high reliability. In addition, by receiving the feedback signal and the failure signal obtained by analyzing the feedback signal, the control device can accurately grasp the state of the control target and generate the next appropriate control signal.

According to a third aspect of the present invention, the signal levels L of the two types of signals are set to 0 ≦ L <4 mA and 4 ≦ L ≦ 20 mA.
Alternatively, 0 ≦ L <1V and 1 ≦ L ≦ 5V.

Normal signals are 4 ≦ L ≦ 20 mA or 1 ≦ L
It is performed at a level of L ≦ 5V. Therefore, for example, a control signal or a feedback signal is transmitted in this region, and a fault signal is transmitted in a region of 0 ≦ L <4 mA or 0 ≦ L <1 V.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows Embodiment 2 of the present invention.
1 shows a configuration of a mixed system of a heavy system and a single system. The dual system and the single system mixed system include a dual system controller 1, a single system controller 2, and a control target 3. The dual system control device 1 includes two control devices 4, and each control device 4 includes a control unit 5 and a failure determination unit 6. The failure determination unit 6 analyzes the feedback signal and the failure signal from the single system controller 2 and examines whether the control signal of the control unit 5 is properly implemented.
Further, the control unit 5 diagnoses whether or not the control unit 5 is operating properly and outputs it to the control unit 5 as a failure signal. The control unit 5 is a control target 3
To generate a control signal for controlling. At this time, the failure determination unit 6
The control signal is corrected based on the feedback signal from the controller and the analysis result of the failure signal. The corrected control signal and a failure signal indicating whether the self is operating properly are output to the single system controller 2.

The single system controller 2 includes a selector 7, a controller 8, a feedback signal processor 9, and a failure determiner 10.
Consists of The selector 7 selects a sounder control signal of the controller 5 from the control signal and the failure signal sent from the two controllers 5. The control unit 8 controls the control target 3 based on the control signal selected by the selection unit 7.

The feedback signal processing section 9 controls the control target 3
And processes the signals from the various sensors attached thereto to generate a feedback signal indicating the operation state of the control target 3. The failure determination unit 10 determines the control target 3 based on the feedback signal.
Generates a failure signal indicating whether the is operating properly,
The signal is transmitted to the failure determination unit 6 of the dual system control device 1 together with the feedback signal. Each control unit 5 and the selection unit 7 are connected by one signal line 11 and 12, and the failure determination unit 10 and each failure determination unit 6 are connected by one signal line 13 and 14.

A control signal and a failure signal are sent from the control unit 5 to the selection unit 7 to the signal lines 11 and 12. The signal level of the fault signal is transmitted in the range of 0 ≦ L <4 mA or 0 ≦ L <1 V, and the control signal level is set to 4 ≦ L ≦ 20 mA or 1 ≦ L ≦
Transmit in the 5V region. A feedback signal and a failure signal are sent from the failure determination unit 10 to the control unit 5 on the signal lines 13 and 14. Set the signal level of the fault signal to 0 ≦ L <4 m
A is transmitted in the region of A or 0 ≦ L <1V, and the feedback signal level is transmitted in the region of 4 ≦ L ≦ 20 mA or 1 ≦ L ≦ 5V. As described above, by transmitting two types of signals by dividing the signal level region, two types of signals can be transmitted by one signal line. As a result, the number of signal lines can be reduced, and in addition to the reduction in the number of signal lines, the size of the connector can be reduced, the cable weight can be reduced, and the number of auxiliary circuits can be reduced.

[0016]

As is apparent from the above description, the present invention provides a dual system controller and a single system controller which transmit two types of signals by dividing the signal level region into signal lines. The number of signal lines can be reduced. The connector can be miniaturized by reducing the number of signal lines, reducing the weight of the cable,
The number of auxiliary circuits can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a dual system and a single system mixed system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a conventional dual system and single system mixed system.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 double system control device 2 single system control device 3 controlled object 4 control device 5 control unit 6 failure determination unit 7 selection unit 8 control unit 9 feedback signal processing unit 10 failure determination unit 11, 12, 13, 14 signal line

Claims (3)

[Claims] 1. A dual control device comprising two control devices for controlling the same control target, and selecting one of the signals from each control device of the dual control device to select the control target. In a dual-system / single-system mixed system including a single-system device that controls and transmits a feedback signal from a control target to each control device of the dual-system control device, each control device transmits the signal to the single-system device. The signal and the signal from the single unit to each control device are respectively composed of two types of signals. The signal levels of these two types of signals are set in mutually different regions,
A signal transmission method for a dual system and a single system mixed system, characterized in that the signal transmission is performed by a single signal line. 2. The single system control device according to claim 1, wherein the selection unit selects one of the signals from the control devices to control a control target, and determines a failure by analyzing a feedback signal from the control target. A signal from each control device to the selection unit includes a control signal and a failure signal, and a signal from the failure determination unit to each control device includes a feedback signal and a failure signal. Item 2. The signal transmission method of a dual system and a single system mixed system according to Item 1. 3. The signal level L of the two types of signals is 0 ≦
L <4 mA and 4 ≦ L ≦ 20 mA or 0 ≦ L <1 V
2. The signal transmission method according to claim 1, wherein 1 ≦ L ≦ 5V.