JPH0453359B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multiplex signal transmission system, and particularly to an integrated wiring system in an automobile.

[Conventional technology]

Automobiles are equipped with a large number of electrical components such as various lamps, motors, and sensors, and the number of these components is increasing, and the bundles of electric wires called wire harnesses that connect these electrical components are also becoming more complex and larger. I've been doing it. For this reason, productivity, ease of assembly, cost,
This is becoming a major problem in terms of maintainability, etc. Furthermore, wire harnesses are susceptible to inductive noise;
It may also cause malfunction.

As one method for solving these problems, an integrated wiring system has been proposed that applies multiplex transmission technology to transmit a large number of signals with a small number of wiring lines.
It may also cause malfunction. As one method for solving these problems, optical fiber cables, which are lightweight and non-inductive, are often used as multiplex transmission lines. Such a wiring system is disclosed in, for example, Japanese Unexamined Patent Publication No. 171852/1983.

By the way, there is data transmission in automobiles that does not have a one-to-one input/output relationship. In other words, there are those that do not operate unless multiple switch inputs are turned ON at the same time (hereinafter referred to as AND input loads), those that operate only if any of the multiple switch inputs are ON (hereinafter referred to as OR input loads), Some devices operate multiple loads with one switch input.
An example of an AND input load is the key switch
An example of a load with an OR input is a rear differential follicle that operates with the AND of ON and the rear differential follicle switch, and a room lamp that operates with the OR of the door switch.

FIG. 2 shows an example of wiring between a room lamp and a rear differential camera. One side of the room lamp 95 is connected to the + terminal of the battery 90, and the other side is connected to the door switch 91, 9 installed in each door.
Connected to 2. For the rear defogatsuga 96,
Key switch 93 and rear differential switch 94
are directly connected.

[Problem to be solved by the invention]

There are two methods for realizing the above-mentioned conventional integrated wiring system: a hardware method and a software method. However, the hardware method uses a signal after ANDing or ORing multiple inputs. If the number of AND inputs and OR inputs increases, the number of wires increases and the benefits of implementing an integrated wiring system are halved. There was a problem.
Therefore, it is necessary to use software to efficiently process these inputs and outputs, and also to easily deal with differences in the input/output relationship due to different models, but the above-mentioned conventional technology does not take this into account sufficiently. Ta.

An object of the present invention is to provide an integrated wiring system that can easily accommodate various input/output relationships and can communicate efficiently.

[Means to solve the problem]

The above purpose is to provide a central control means having respective means for collecting data, creating transmission data, and transmitting the data, and connecting with a plurality of data generation sources and a plurality of loads, and controlling the data transmitted from the central control means. a terminal control means having means for receiving, controlling the load based on the received data, and transmitting data from the data source to the central control means; the central control means and the terminal control means; In an integrated wiring system comprising multiple signal transmission means for coupling, the central control means has a wiring table in which a data transmission/reception relationship between the data generation source and the load is described, and a data transmission order in which the data transmission order is described. a transmission control table for storing received data, a monitor table for storing received data, and a control data table for storing transmitted data; the monitor table stores received data when data is received from the terminal control means; The control data in the control data table is configured to be updated to the control data calculated based on the wiring table corresponding to the changed input when the input changes in the monitor table. It will be achieved.

[Effect]

The received data is stored in the monitor table when data is received from the terminal control means, and when the input of the monitor table changes, the control data is calculated based on the corresponding wiring table. Since the data in the data table is updated, the control data table can be updated based on the latest monitor data table information during data transmission, so the load on the central control means related to communication can be reduced.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 shows an example of an integrated wiring system installed in an actual vehicle. CCU1 and terminal control unit (LocalControlUnit.hereinafter referred to as LCU) 11-1
7 is connected in a star shape with optical fiber 2, and CCU1 transmits information such as switches to LCU11~
17, control data is created in response to the input, and loads such as lamps are controlled through LCUs 11 to 17. Taking the room lamp 95 as an example, the CCU 1 reads the values of the door switches 9 and 92 through data transmission with the LCU 13 and LCU 15, and controls the room lamp 95 by transmitting control data to the LCU 15. At this time, data is transmitted to turn on the room lamp 95 when at least one of the door switches 91 and 92 is ON. In the example of the rear defogger 96, the key switch 93 is
Read the Acc and ON status from the LCU 13, read the rear differential switch 94 status from the LCU 14,
The CCU 1 performs an AND operation, transmits the AND result to the LCU 17, and controls the rear differential camera 96.

FIG. 3 is a block diagram showing an embodiment of the configuration of the CCU and LCU in FIG. 1. The CCU 1 has a microcomputer 5 because it requires a high degree of judgment processing ability. Signal transmission control circuit 6
(CIM: Communication and Interface Module
) has the function of serially converting control data generated by a microcomputer and transmitting it, and when receiving serial data, synchronizing, detecting errors, converting to parallel, and outputting an interrupt request signal. There is. The analog switch 8 is used to select the LCU to which the data is transmitted. 21-2
3 is a photoelectric converter, which is equal to the number of LCUs. 9
is a memory device for storing various tables.

On the other hand, LCU13 to 17 are photoelectric converter 4, CIM
7, an input/output interface 4, an A/D converter 3, etc. As is clear from Figure 3,
CIM is used in CCU and LCU and is one of the important components.

The circuit configuration of the CIM is shown in FIG. 4, and the state transition diagrams are shown in FIGS. 5 and 6. CIM can be roughly divided into a control section and an interface section.The control section includes a synchronous circuit 6
1, a control circuit 62, and an address comparator 63.
The interface section includes a shift register 64,
A/D converter control circuit 65, input/output buffer 66
It consists of The synchronization circuit 61 is connected to the line 68
This is the part that synchronizes the clock within the CIM with the received data. The control circuit 62 controls the shift operation of the shift register 64, transmission error control, and the like. The address comparator 63 compares the address included in the received data with the address (not shown) assigned to the CIM to check whether the received data is addressed to itself. The CIM in Figure 4 is
Although the case where it is used in the LCU is shown, as mentioned earlier, CIM is also used in the CCU.
CIM has an address terminal, and by changing the address value, it can be
Can be used within LCU.

The operation of the CIM within the LCU will be explained using the state transition diagram shown in FIG. A reset signal causes the device to enter an idle state, that is, to wait for data reception. When data is received here, it shifts to the receiving state. Transmission error detection is performed during reception, and when an error is detected, the state returns to the idle state and waits for reception again. The received data is stored in the shift register 64, and when reception is completed, it is transferred to the input/output buffer 66 and sent to the external Control the load. At the same time, the switch information is taken into the input/output buffer 66, the state becomes zero transmission, and then the state shifts to the transmittal state. At this time, the data in input/output buffer 66 is loaded into shift register 64 and transmitted on line 69. Once the transmission is complete, it becomes idle.

Next, the operation of the CIM in the CCU will be explained using the state transition diagram shown in FIG. Becomes idle by a reset signal. Idle is waiting for reception, but it is greatly different from FIG. 5 in that it can transition to zero transmission and transmission. This transition allows the CCU to initiate transmission. When receiving data, a transmission error is detected in the receiving state, and if there is no error, an interrupt request flag is set and the operation returns to idle.

FIG. 7 shows a flowchart of data processing in the centralized wiring system shown in FIG. 1, which uses the above-mentioned CIM for the CCU and LCU. It consists of a main routine that generates control data, an IRQ routine that controls transmission, and a timer interrupt processing routine that handles abnormalities. The main routine initializes memory, timers, etc., and starts transmission. After starting the transmission, the control data table that stores the transmission data is repeatedly updated.

The IRQ routine is executed by interrupting the execution of the main routine when data is received from the LCU.
It takes in the received data, stores it in the monitor data table, changes the transmission destination to the next CIM, and sends the control data.

The timer interrupt routine
This is executed when data cannot be received from the LCU, and if data cannot be received continuously from the same CIM, there may be a failure in the transmission line, etc., so an alarm is issued in some way. It also sends control data to the next CIM so that transmission does not stop.

In order to efficiently execute the process shown in FIG. 7, the present invention uses four types of tables as described below. They are the transmission control table of FIG. 8, the monitor data table and control data table of FIG. 9, and the wiring table of FIG. 10.

First, the transmission control table shown in Fig. 8 is a 1-byte table that shows the order in which the CIMs of the transmission destination are transmitted.The upper 4 bits indicate the address of the CIM, and the lower 4 bits indicate the address of the analog switch 8 ( 3) is shown. n in FIG. 8 is the total number of CIMs in the LCU.

The monitor data table and the control data table have the same table specifications and are shown in FIG. This is a 3-byte table, and has the same bit configuration as the shift register 64 in the CIM (Figure 4), so that the data in the shift register 64 can be stored as is in the monitor data table when data is received. . n is the total number of CIMs.
The monitor data table and control data table are
This is a table created in RAM and updated by transmission, and both tables are initially at θ.

Finally, FIG. 10 shows the wiring table. The wiring table is a table that shows the logical relationship between input and output.
The number of bytes in the unit is not fixed. The more complex the item, the longer it will be. m is the total number of wires. The wiring logic formulas include those with one-to-one input/output relationships, those with AND inputs, those with OR inputs, and those with more complicated relationships. An example of the wiring table is shown in FIG. This is a wiring table of the logical formula in the lower part of FIG. Focusing on the inputs, they are summarized by input. The delimiter "/" is used only when the input/output is one-to-one. If this symbol is not added, at input C, there will be a line indicating that output X ₃ is the same as the value of X ₂ , and a line where outputs Y ₁ and Y ₂ have values determined by input C. It becomes difficult to tell the difference.

FIG. 12 shows a flowchart of the "update control data table" portion of the main routine of FIG. 7. First, check whether there is a change in the monitor data. If there is a change, the wiring logical formula related to the input is searched from the wiring table, processed, and the control data is updated. The wiring logic processing is sequentially performed for all the wiring logic formulas for the changed inputs, and the process exits from the flowchart of FIG. In processing the wiring logic,
Logical operation processing of AND or OR, inversion processing of control data during one-to-one input/output, output of the example in Figure 11
It handles reading and updating of control data in case of _X3 .

〔Effect of the invention〕

According to the present invention, a large number of
Since the control of the load that is an AND input or an OR input is performed by software in the CCU, even if the switch is far away, it only needs to be connected to the nearest LCU, and this can be achieved without adding hardware. , the integrated wiring system can be downsized. Furthermore, since wiring logic is processed using a table, differences in input/output relationships due to different models can be easily accommodated by simply changing the table. Furthermore, since the wiring logic is represented by a logical formula in the wiring table alone, it has the effect of easily supporting not only simple AND and OR, but also combinations of AND and OR.

[Brief explanation of drawings]

Fig. 1 is a diagram of an integrated wiring system installed in an actual vehicle to which an embodiment of the present invention is applied, Fig. 2 is an explanatory diagram showing a part of the wiring harness, Fig. 3 is a block diagram showing the configuration of the integrated wiring system, and Fig. 3 is a diagram showing a part of the wiring harness. FIG. 4 is a circuit configuration diagram of CIM, FIGS. 5 and 6 are state transition diagrams of CIM, FIG. 7 is a flowchart showing the operation of an embodiment of the data processing method according to the present invention, and FIGS. 8 to 11 Figure 12 is an explanatory diagram showing an example of a table used in the data processing method according to the present invention.
The figure is a flowchart showing one embodiment of wiring logic according to the present invention. 1... CCU, 2... Optical fiber, 5... Microcomputer, 6, 7... CIM, 8... Analog switch, 9... Memory device, 21-24... Photoelectric conversion device, 11-17... LCU, 61... Synchronous circuit, 62
...control circuit, 64...shift register, 66...input/output buffer.

Claims (1)

[Claims] 1 A central control means having respective means for collecting data, creating transmission data, and transmitting the same, connected to a plurality of data generation sources and a plurality of loads, and receiving data transmitted from the central control means; a terminal control means having respective means for controlling the load based on the data generated and transmitting data from the data source to the central control means; and a multiplex signal coupling the central control means and the terminal control means. In the centralized wiring system, the central control means includes a wiring table that describes a data exchange relationship between the data generation source and the load, and a transmission system that describes the data transmission order. It has a control table, a monitor table for storing received data, and a control data table for accumulating transmitted data, and the monitor table stores the received data when data is received from the terminal control means, and the monitor table stores the received data when the data is received from the terminal control means. An integrated wiring system characterized in that control data in a data table is updated to control data calculated based on the wiring table corresponding to the changed input when there is a change in the input in the monitor table.