JPH066868A - On-vehicle communication controller - Google Patents

Abstract

PURPOSE:To improve the using efficiency of a controller and a wiring for communication, to improve the controlling efficiency of plural objects to be controlled, and to make it difficult to be affected by an adverse influence due to an external noise from an ignition plug. CONSTITUTION:In an on-vehicle communication controller in which a desired control is performed from a controller 10 to plural devices 20 to be controlled through a wiring 30 for communication, the device to be controlled is equipped with a data holding circuit 22 which fetches control data transmitted to its own address, and holds the control data, comparator circuit 23 which compares the held content with the content of a specially inputted feedback signal, equipment control circuit 25 which controls an object 24 to be controlled according to the compared output of the comparator circuit, and monitor device 26 which monitors the control state of the object to be controlled, and outputs the feedback signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted communication control device, and more particularly to a vehicle-mounted communication control device in which a control device and a controlled device are connected via a communication wiring.

[0002]

2. Description of the Related Art This type of vehicle-mounted communication control device is used to perform desired control (positioning control, etc.) from a control device to a plurality of controlled devices through a common communication wiring. Conventionally, the configuration is as shown in FIG. 5, for example. In FIG. 5, the control device 50 has a data instruction device 51, a data operation selection circuit 52, and a control side communication circuit 53.

The controlled device (typically one is shown) 60 is
It has a controlled communication circuit 61, a received data conversion circuit 62, a device control circuit 63, a controlled object 64, a monitor device 65, and a monitor data conversion circuit 66. Communication wiring (data bus) 70
Connects between the control-side communication circuit 50 and the controlled-side communication circuit 60.

In the control device 50, desired control data (eg, positioning data) is output by the data indicating device 51.
Is designated, the desired data is selected by the data operation selection circuit 52, and this desired data is sent to the communication wiring 70 by the control side communication circuit 53.

In the controlled device 60, the controlled side communication circuit 61 takes in data from the communication wiring 70, the received data conversion circuit 62 converts it into a control signal required by the device control circuit 63, and the device control circuit Object controlled by 63 64
Positioning control is performed for. The control state of the controlled object 64 is monitored by the monitor device 65, the output signal thereof is converted into required data by the monitor data conversion circuit 66, and this data is wired by the controlled side communication circuit 61 for communication.
Send to 70.

In the control device 50, the control side communication circuit 53 takes in the data from the communication wiring 70, and the data operation selection circuit 52 obtains the difference data representing the difference from the desired data previously transmitted. The difference data is sent again to the communication wiring 70 by the control side communication circuit 53. Until the difference data falls within the preset allowable error range, the control data from the control device 50 and the monitor data from the controlled device 60 as described above are alternately repeated until the control target is finally reached. Desired positioning control is performed on the object 64.

However, in the conventional vehicle-mounted communication control device as described above, it is usually necessary to use the data operation selection circuit 52 of the control device 50 a plurality of times when controlling one control object 64. During this time, the data operation selection circuit 52 is occupied and the processing time for another job is reduced.

Similarly, the transmission of control data from the control device 50 and the transmission of monitor data from the controlled device 60 are alternately repeated through the communication wiring 70, and the control for one controlled object 64 is completed. Until the communication wiring 70 is occupied,
The time for which the communication wiring 70 is used for controlling another controlled object 64 that shares the communication wiring 70 is reduced. As a result, the use efficiency of the control device 50 and the communication wiring 70 is poor, and there is a problem that the control efficiency for the plurality of control objects 64 cannot be sufficiently obtained.

Moreover, in the in-vehicle communication control device,
There is a problem that noise from an ignition plug or the like is likely to travel on the communication wire 70, and if the communication wire 70 is occupied for a long time until the control of the controlled object 64 is finished, it is likely to be adversely affected by external noise.

[0010]

As described above, in the conventional vehicle-mounted communication control device, the use efficiency of the control device and the communication wiring is poor, and the control efficiency for a plurality of control objects cannot be sufficiently obtained. There is a problem that it is easily affected by external noise.

The present invention has been made to solve the above-mentioned problems, and the use efficiency of the control device and the communication wiring is improved, the control efficiency for a plurality of control objects is improved, and the adverse effect of external noise is reduced. An object of the present invention is to provide a vehicle-mounted communication control device that is hard to receive.

[0012]

A vehicle-mounted communication control device of the present invention includes a control device for sending control data for performing desired control to a plurality of controlled devices via a common communication wiring. , A holding circuit which is provided in each of the controlled devices and takes in control data addressed to itself from the communication wiring and holds this control data, and compares the holding content of this holding circuit with the content of a feedback signal separately input. And a device control circuit that receives the comparison output of the comparison circuit as a control input and controls the controlled object according to the control input, monitors the control state of the controlled object, and returns the feedback. And a monitor device for outputting a signal.

[0013]

Since the controlled communication circuit has the control data holding circuit and the feedback control loop, the control device only needs to send the control data to the controlled device only once for controlling one controlled object. I'm done.

As a result, it becomes possible to quickly use the data operation selection circuit and the communication wiring of the control device for another work, the use efficiency of the control device and the communication wiring is improved, and a plurality of control devices are used. The control efficiency for the object is improved.

Moreover, since the occupation time of the communication wiring until the control of the controlled object is completed is short and the control loop is relatively short, it is less likely to be adversely affected by external noise from the spark plug or the like.

[0016]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows the basic configuration of an in-vehicle communication control device according to the present invention.

The control device 10 has a function of sending out control data for performing desired control to a plurality of controlled devices 20 via a common communication wiring (data bus) 30.

That is, the control device 10 is a data indicating device.
Desired control data (for example, positioning data) is designated by 11, the desired data is selected by the data operation selection circuit 12, and this desired data is sent out to the communication wiring 30 by the control side communication circuit 13.

Each controlled device (typically one is shown) 20
Is a controlled side communication circuit 21 that takes in control data addressed to itself from the communication wiring 30, a data holding circuit 22 that holds the control data taken in by this circuit, and the contents held in this data holding circuit separately. A comparison circuit 23 for comparing the content of the feedback signal and a comparison output of this comparison circuit are given as control inputs, and a device control circuit 25 for controlling (for example, positioning control) the controlled object 24 according to the control inputs.
And a monitor device 26 for monitoring the control state of the controlled object and outputting the feedback signal.

The comparison circuit 23, the device control circuit 25, the controlled object 24, and the monitor device 26 form a feedback control loop, adjust the control amount for the controlled object 24, and control the controlled state of the controlled object 24. Is controlled to fall within a predetermined tolerance range.

According to the on-vehicle communication control device, since the controlled device 20 has the data holding circuit 22 and the feedback control loop, the control device 10 controls the communication wiring 30 for controlling one controlled object 24. Then, the control data need only be transmitted once (that is, the communication wiring 30 is occupied only once).

As a result, the data operation / selection circuit 12 and the communication wiring 30 of the control device 10 can be quickly used for another task, and the control device 10 and the communication wiring 30 can be used.
The efficiency of use of the control object is improved, and the control efficiency for a plurality of control objects 24 is improved. Moreover, since the communication wiring 30 is occupied for a short time until the control of the controlled object 24 is completed and the control loop is relatively short, it is less likely to be adversely affected by external noise from the spark plug or the like. Figure 2
Shows a first embodiment of the vehicle-mounted communication control device of the present invention, and the same parts as those in FIG. 1 are designated by the same reference numerals. In FIG. 2, a data selection switch circuit is used as the data instruction device 11, and the contents of the control data are instructed by the switch operation. A microcomputer is used as the data operation selection circuit 12. A data register is used as the holding circuit 22.

As the comparison circuit 23, a digital-analog conversion circuit (D / A conversion circuit) 231 for converting the data held in the holding circuit into a control signal, and the control signal obtained by this conversion circuit are input from the monitor device. And a voltage comparison circuit 232 for comparison with the feedback signal. In this voltage comparison circuit 232, the output voltage of the D / A conversion circuit 231 is input to the positive phase (+) side input terminal, and the feedback signal is input to the (−) side input terminal. A motor control circuit is used as the device control circuit 25, and a motor is used as the controlled object 24. A potentiometer attached to the motor output shaft is used as the monitor device 26, and the monitor output is supplied as a feedback signal.

When the (+) side input voltage and the (-) side input voltage are different from each other, the voltage comparison circuit 232 controls the motor 24 so as to rotate the motor 24 clockwise or counterclockwise according to the magnitude relationship between the two inputs. Generate output. Then, the feedback control loop performs feedback control so that the monitor output becomes substantially equal to the output voltage of the D / A conversion circuit 231. FIG. 3 shows a second embodiment of the vehicle-mounted communication control device of the present invention.

The device of the second embodiment is different from the device of the first embodiment shown in FIG. 2 in comparison circuit 23 and monitor device 26.
2 and the other parts are the same, and are therefore assigned the same reference numerals as in FIG. As the monitor device 26, a counter for counting the number of rotations of the motor output shaft is used.

A subtraction circuit is used as the comparison circuit 23, and the data held in the holding circuit 22 is input to one input terminal thereof, and the output data of the counter 26 is input to the other input terminal thereof. . Then, by using the carry flag output of the subtraction circuit 23, the motor 24 is controlled to rotate rightward or leftward. According to the device of the second embodiment described above, the number of analog systems in the feedback control loop is reduced, and the device is resistant to external noise. Further, the zero flag output indicating that the output content of the subtraction circuit 23 has become zero can be used to control the power supply 27 of the motor 24 for which control has been completed to the off state. FIG. 4 shows a third embodiment of the vehicle-mounted communication control device of the present invention.

The device of the third embodiment is different from the device of the second embodiment shown in FIG. 3 in the controlled side communication circuit 21 and the control side communication circuit 13, and the other parts are the same, and therefore, the device shown in FIG.
The same symbols as in the inside are attached.

The controlled-side communication circuit 21 is guided by the zero flag output of the subtraction circuit 23. When this zero flag signal is input, a control end signal indicating that the control of the motor 24 has ended is sent to the communication wiring. Send to 30. When the control end communication circuit 13 receives the control end signal from the communication wiring 30, the control side communication circuit 13 notifies the microcomputer 12 of the control end.

In each of the above embodiments, the motor 24
However, the present invention is not limited to this, for example, when controlling the power window, control data designating the upper limit position of the window is transmitted to monitor the rising speed of the window. , When it is detected that the rising speed has decreased while the window was rising to the specified position (a situation that hinders the rising operation of the window has occurred), the rising operation of the window is stopped or the window is lowered. By configuring the control system in the, it becomes possible to enhance the safety when the window is closed.

[0030]

As described above, according to the vehicle-mounted communication control device of the present invention, the control device only needs to transmit the control data once to the controlled device for controlling one controlled object. Therefore, the use efficiency of the control device and the wiring for communication is improved, the control efficiency for a plurality of control objects is improved, and it is less likely to be adversely affected by external noise from the spark plug or the like. Therefore, it is very advantageous when a large amount of data is handled by adopting a LAN (Local Area Network) configuration for controlling a large number of control objects.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of a vehicle-mounted communication control device of the present invention.

FIG. 2 is a block diagram showing a first embodiment of a vehicle-mounted communication control device of the present invention.

FIG. 3 is a block diagram showing a second embodiment of the vehicle-mounted communication control device of the present invention.

FIG. 4 is a block diagram showing a third embodiment of the vehicle-mounted communication control device of the present invention.

FIG. 5 is a block diagram showing a conventional vehicle-mounted communication control device.

[Explanation of symbols]

10 ... Control device, 11 ... Data instruction device, 12 ... Data operation selection circuit, 13 ... Control side communication circuit, 20 ... Controlled device, 21 ... Controlled communication circuit, 22 ... Holding circuit, 23 ... Comparison circuit, 24 … Control object, 25… Equipment control circuit, 26… Monitor device, 27…
Motor power supply, 30 ... Communication wiring (data bus).

Claims (2)

[Claims] 1. A control device for sending out control data for performing desired control to a plurality of controlled devices via a common communication wiring, and a control device provided in the controlled device, wherein the communication wiring is connected to the controlled device. A holding circuit that takes in control data addressed to itself and holds this control data, a comparison circuit that compares the contents held in this holding circuit with the contents of a feedback signal that is input separately, and the comparison output of this comparison circuit is used as the control input. A device control circuit for controlling a controlled object according to a given control input, and a monitor device for monitoring the control state of the controlled object and outputting the feedback signal. In-vehicle communication control device. 2. The in-vehicle communication control device according to claim 1, wherein the monitor device outputs a digital signal, and the comparison circuit outputs digital data from the data holding circuit and digital data output from the monitor device. An in-vehicle communication control device characterized by comparing with a signal.