JPH0617405Y2 - Anomaly detection device in automobile integrated wiring system - Google Patents

Description

The present invention relates to an abnormality detection device in an integrated wiring system for an automobile, and particularly detects an abnormality that occurs when controlling a control target such as lamps and various sensors provided in various places of the automobile. Related to the device.

Recently, with the increase of controlled objects such as lamps and various sensors installed in automobiles, electric wiring becomes complicated, wiring work becomes difficult, erroneous wiring is likely to occur, the amount of electric wires used increases, and it becomes expensive. There is a problem. In order to solve this problem, the following can be considered.

That is, a plurality of control objects equipped in a vehicle are grouped by those whose arrangement positions are close to each other, and the control objects included in each group are configured to be controllable by a corresponding terminal control unit. Then, one central control unit is provided for the plurality of terminal control units, and the central control unit and each terminal control unit are connected by a data transmission line. The central control unit controls the load of the central control unit itself based on a signal from each operation means or data from each terminal control unit, or transmits control data to each terminal control unit. Each terminal control unit drives and controls the corresponding controlled object based on the control data given from the central control unit, and also sends signals from sensors and switches connected to itself to the central control unit as series data. To do.

According to the above-mentioned method, one data transmission line can be integrated between the central control unit and each terminal control unit. Therefore, it is possible to simplify the wiring work, reduce the amount of electric wires used, and configure the device at low cost.

By the way, when an abnormality occurs in a certain terminal control unit, it becomes impossible to perform control based on data from the certain terminal control unit and normal drive control of a control target corresponding to that terminal control unit.
In such a case, the traveling of the automobile may fall into an extremely dangerous state depending on the type of the controlled object. For example,
If the controlled object is a headlight, it cannot drive at night, and if it is a turn signal, it cannot notify another vehicle that it will turn right or left, which causes a traffic accident. Therefore, it is important to monitor the data exchanged between the central control unit and each terminal control unit for errors and to check whether the terminal control unit has any abnormality. However,
There are many sources of noise such as an engine in an automobile, and these noises may be mixed in the communication data to temporarily cause an error in the data. Therefore, with the above method,
Abnormalities in the terminal control unit are frequently detected, and smooth driving cannot be expected.

Therefore, a main object of the present invention is to provide an abnormality detection device in an integrated wiring system of an automobile in which a temporary data error due to noise mixing and a data error due to an abnormality in a terminal control unit can be easily recognized. It is to be.

In summary, this invention is provided with a central control unit common to a plurality of terminal control units, and further provided with a lighting display unit and a manually operable command unit for each terminal control unit. The control unit monitors the data received from the terminal control unit, detects an error thereof, turns on the corresponding lighting display means for a short time according to the error of the data, and responds to the instruction from the instruction means to the corresponding terminal. The control by the data from the control unit is prohibited.

Specific embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an outline of an integrated wiring system of an automobile to which the present invention is applied. In the configuration, for example, a master processor (hereinafter referred to as a master MPU) 10 as an example of a central control unit is provided under the dashboard or the like. A DC voltage is supplied from the storage battery 1 to the master MPU 10. In this embodiment, the master MPU 10 itself also has a function as a terminal, and is mainly connected to the operation means 2A and the controlled object 2B located in the center of the automobile. The operation unit 2A includes various operation switches provided in association with, for example, an instrument panel or a handle. The MPU 10 is also connected with illuminated push button switches 3A to 3D. These switches 3A to 3D
Are terminals MPUs 20A to 20D described later, respectively.
And the fact that an abnormality has occurred in the corresponding terminal MPU is displayed by its lighting. Then, the switch in the lighted state is turned off by being pressed.

Further, the master MPU 10 is connected with terminal processors (hereinafter referred to as terminal MPUs) 20A to 20D, which are examples of terminal control units provided at appropriate places of the automobile, via cables 30A to 30D. Each of the terminals MPU20A-20D has
A plurality of control targets and / or detection targets (hereinafter collectively referred to as a control target group) 40A to 40D are connected. Here, the controlled object refers to electrical components such as various lamps and wipers that are mounted on the vehicle, as will be described with reference to FIGS. 2A to 2D described later. The detection targets are various types of sensors that detect the targets of various indicators included in the instrument panel of the automobile. These controlled object groups 40A to 4
0D is a group of a plurality of controlled objects that are arranged close to each other, and is a terminal MP corresponding to each group.
It is controlled by U20A to 20D. Here, the case where the number of terminal MPUs is four is shown in the figure, but this is to represent the case where various control targets are grouped separately in the front, rear, left and right of the vehicle. For that purpose, the controlled object group 40A includes various controlled objects provided in the front left portion of the vehicle, and the terminal MPU 20A is provided in a position close to the front left portion of the vehicle. Similarly, the control target groups 40B, 40C, and 40D are provided in association with the front right side portion, the rear left side portion, and the rear right side portion of the vehicle, respectively, and corresponding terminals MPUs 20B, 20C, and 20D are provided.

2A to 2D are diagrams schematically showing an example of a control target or a detection target connected in association with the output terminal or the input terminal of each of the terminals MPU 20A to 20D. Therefore, each of the output terminals is associated with a signal line for various types of controlled objects shown in the figure or a switch for putting these controlled objects into an operating state. As is apparent from the figure, the output terminal and the input terminal of each of the terminals MPU 20A to 20D are formed after a fixed number of bits (for example, 8 bits), and the operating state of the controlled object is controlled by the logical state output from one bit. It is a thing. As shown in FIGS. 2B and 2C, the data input to each of the terminals MPU 20B, 20C is detected by a sensor for detecting the water temperature of an example of the detection target or a sensor for detecting the amount of gasoline. This is the value that was set.

Further, although not shown in FIGS. 2A to 2D, the energization signal of each control target is input to each of the terminals MPU 20A to 20D.

Further, FIG. 2E shows a connection mode of the operating means and the controlled object to each terminal of the master MPU 10. If the number of operating means is more than 1 byte (for example, 8 bits) as shown in the figure, the output of all operating means is received as an input in a plurality of bytes.

Each of these terminals MPU 20A to 20D and master MP
The types of control target and detection target connected to U10 are
This is only an example, and it differs depending on the model and model of the car.

FIG. 3 is a sectional view showing a specific configuration of the cables 30A to 30D. The cables 30A to 30D include a power line 31 at the center thereof. Around the power line 31, a data transmission line 33 including a set of system power supply line 32 and a set of optical fibers 331 and 332.
Are placed. Insulation 34 coats the peripheral portion of each line or optical fiber.

FIG. 4 is a concrete circuit diagram of an embodiment of an integrated wiring system which is a feature of the present invention. In the illustrated embodiment, the master MPU 10 and one terminal MPU (for example, 2
0A).

In the configuration, the master MPU 10 includes a central processing unit (hereinafter CPU) 11. Bus line 1 for CPU 11
Memory for storing programs and data tables (hereinafter ROM) 13 and memory for storing data (hereinafter RA
M) 14, transmission control circuit 15, input / output interface 1
6 and the interface 18 are connected. CPU11
, Includes registers J, K, and I, although not shown. A power supply circuit 19 for controlling on / off of the system power supply circuit of each terminal is connected to the interface 18. The input / output interface 16 includes terminals M
The operation means 2A for selecting the operation state of the plurality of control objects corresponding to the PUs 20A to 20D and the control object 2B such as various indicators and meters are connected. The operation unit 2A includes a plurality of operation switches 2a to 2n.
The transmission control circuit 15 includes a transmission buffer amplifier 51a corresponding to the pair of optical fibers 331 and 332 included in each of the cables 30A to 30D (only 30A is shown in the figure).
To 51d and reception buffer amplifiers 58a to 58d are connected. Further, the master MPU 10 includes a system power supply circuit 17. The system power supply circuit is supplied with power from the storage battery 1.

The terminal MPU (for example, 20A) includes the CPU 21,
ROM connected to CPU 21 via bus line 22
23, a RAM 24, a transmission control circuit 25 and an input / output interface 26. Furthermore, the terminal MPU20A
A system power supply circuit 27 for supplying electric power to each unit is included. The transmission control circuit 25 includes a reception buffer amplifier 54a.
And the transmission buffer amplifier 55a is connected. The transmission buffer amplifier 51a and the reception buffer amplifier 54a are
Optical coupler 52a, optical fiber 331 and optical coupler 53
It is connected via a. The transmission buffer 55a and the reception buffer 58a are composed of an optical coupler 56a, optical fibers 332, and
It is connected via the optical coupler 57a. The system power supply circuit 27 is connected to the storage battery 1 via the system power supply line 32.

In relation to a plurality of control objects included in the control object group 40A, for example, a headlight (H beam) 410 and a wiper 415,
A drive circuit is provided. This drive circuit includes a headlight 41
A power switch 430 and a diode 440 connected in series to 0, and a power switch 435 and a diode 445 connected in series to the wiper 415 are included.
These power switches 430 ... 435 are connected to the positive electrode terminal of the storage battery 1 via the power line 31. CP
A driver 42 is provided to selectively turn on or off each of the power switches 430 ... 435 by the output of U21.

Note that the other terminals MPU 20B to 20D have the same circuit configuration as 20A and are different only in the control target group to be connected, and thus detailed configurations thereof will be omitted.

FIG. 5 is a diagram schematically showing the storage contents of the ROM 13 included in the master MPU 10. In the figure, the control target is shown in correspondence with the number of each operation switch included in the operation means 2A. The ROM 13 has a storage area of 4 bytes for each operation switch, and each byte has a high-order 3 bytes.
The bit indicates the terminal number corresponding to the controlled group, and the subsequent 3 bits indicate the load number to be operated.
The remaining 2 bits (lower 2 bits) are not used because it is assumed in this embodiment that the number of loads provided in one terminal MPU is 16 or less, but the terminal MPU is not used.
Used when the number of and the number of loads increase.

For example, the load corresponding to the high beam switch of the headlight (headlamp) connected to the 0th input terminal (IN) of the master MPU 10 is the load number 0 of the terminal MPU 20A (RS # O if the terminal number is shown). , Terminal MPU20B
(RS # 1) load number 0, terminal MPU20C (RS #
The load number of 3) is 4, and the load number of the master MPU 10 (MS # 4) is 0. When each 1-byte storage area of the ROM 13 is considered as a table, each table is represented by M (J, I) in the figure. However, J
Means the byte number (0 to 3) of the storage area corresponding to one operation switch, and I is the operation switch number (0
~ 15) is meant.

It should be noted that the terminal control unit has five when the master MPU 10 is included, but when there is a switch having five or more loads, one load requires an area of 5 bytes or more.

FIG. 6 is a diagram schematically showing a storage area of the RAM 14 included in the master MPU 10. In the figure, RAM1
4 includes storage areas MSW, MOUT and MRCV. Here, the storage area MSW includes 16-byte storage areas SW _{0 to} SW ₁₅ if the number of operation switches connected to the master MPU 10 is 16, and the number (# _{0 to} # ₁₅₎ of the operation switches that are turned on. ) Is sequentially written from the upper area and stored. The storage area MOUT is for each terminal M
Area M of 1 byte for PU 20A to 20D (RS # 0 to RS # 3) and master MPU 10 (MS)
Including OUT _{0 to} MOUT ₄ , a load number to be driven is stored by a plurality (8 in the figure) of 1 byte each. The storage area MRCV is used for each terminal MPU 20A to 20D (RS
Area MRCV _{0 of} 1 byte for # _{0 to} # ₃₎
To MRCV ₃ and stores the received data transmitted from the corresponding terminal MPU to each area.

Further, the RAM 14 includes storage areas D, MA and MB. Here, the storage area D is for each terminal MPU 20 to 20.
D (RS # ₀ to RS # 3) includes areas D _{0 to} D ₃ of 1 byte each. In these areas D _{0 to} D ₃ , when the corresponding terminal MPU is determined to be abnormal, its terminal number is registered. The storage area MA is for each of the terminals MPU 20A to 2
0D (RS # _{0 to} # ₃ ) includes areas MA _{0 to} MA ₃ of 1 byte each, and temporarily stores the received data transmitted from the corresponding terminal MPU to each area. The storage area MB includes the terminals MPU 20A to 20D (RS # 0
To # 3) area of each byte MB _{0 to} MB ₃
And temporarily stores the received data from the corresponding terminal MPU in each area.

FIG. 7 is a time chart for explaining the operation of the integrated wiring system according to the embodiment of the present invention. Prior to the description of the operation of this embodiment, an outline will be given with reference to FIG. From the master MPU 10, each terminal MPU 20A-2
One frame data for sequentially designating 0D is transmitted. This 1-frame data contains the destination data SDA,
Source data SSD, control data and BCC code are included. The control data is data for driving and controlling each load (control target) corresponding to the destination terminal MPU, and is, for example, 1-byte data. The BCC code is used for error control, and for example, a vertical / horizontal parity check code is used. Each of the terminals MPU20A to 20D is a master MPU10.
If the one-frame data from 1 is received and the destination data specifies itself, the corresponding load is driven based on the control data.

The master MPU 10 is connected to a plurality (4 in the embodiment).
Information transmission means (for example, water temperature sensor, fuel amount sensor, etc.) connected to each terminal MPU by sequentially designating each terminal MPU 20A to 20D after sequentially transmitting 1 frame of data to each terminal MPU 20A to 20D. The polling signal for instructing the transmission of the detection data of is derived.
When the polling signal designates itself, each of the terminals MPU 20A to 20D transmits one frame data including the operation state detection data to the master MPU 10.

8 to 11 are flowcharts for explaining the operation of the embodiment of the present invention, particularly FIGS. 8 to 10 show the operation flow on the master side, and FIG. 11 shows the operation on the terminal side. The flow is shown. Note that FIG. 9 is an operation flow showing details of the subroutine of the step (abbreviated as S in the figure) 33 shown in FIG.

Next, the specific operation of this embodiment will be described with reference to FIGS.

Initialization Processing Operation of RAM 14 First, in step 10, area D _{0 of} RAM 14
It is written (logic "1" to all other words of 8 bits) to D ₃ in hexadecimal display of "FF" data. Also, the area _MA 0 to MA ₃ and areas _MB 0 to MB ₃ in hexadecimal data "00" (all ie 8 bits are logic "0") is written. Then, in step 11, the areas MSW _{0 to} MSW ₁₅ of the RAM 14 are updated to 16 areas.
The data of "FF" is written in decimal notation. Also, data of "OO" in the area MOUT ₀ ~MOUT ₄ hexadecimal display is written.

Step 12 of registering operation switch number in ON state
In # _{16 to} # ₁₆ , among the various operation switches (SW _{0 to} SW ₁₅ ) included in the operation means 2A, the operation switch numbers in the ON state are registered in the respective areas of the storage area MSW. That is, in step 12, the register K and the register J included in the CPU 11 are included.
Is set to 0. In step 13, register K
It is determined whether the operation switch (initially SW ₀ ) corresponding to the value stored in is ON. If the ON state of the switch is judged, the area MSW corresponding to the value of the register J (initially 0) is determined in step 14.
The contents of register K are written into _J. As a result, the number of the switch in the ON state is registered. At the same time,
The value of register J is incremented by 1. In step 15, the value of register K is incremented by 1. Step 1
At 6, it is determined whether the value of the register K has become equal to the total number of operation switches (for example, 16). If it is determined that the number of all the switches is not all, it is determined that the operation of determining whether or not all the operation switches (SW _{0 to} SW ₁₅ ) are in the ON state has not been completed, and the process returns to step 13. In step 13, the register K
If it is determined that the operation switch designated by the value of is not in the on state (is in the off state), step 14
The process proceeds to step 15 without performing the process. In this way, the operations of steps 13 to 16 are repeated until the operation of determining whether or not all the operation switches included in the operation means 2A are in the ON state is completed.

When it is determined in step 16 that the value of the register K has reached the total number of operation switches, the process proceeds to step 17. In steps 17 to 26, the load number to be controlled is determined based on the number of the operation switch in the ON state and the terminal number and load number of each operation switch set in the ROM 13. More specifically, in step 17, 0 is set in the register K. In step 18, 0 is set in the register J. In step 19, area M corresponding to the value of register K
The content of SW _K (that is, the operation switch number) is stored in the register I. For example, if the operation switch number is 0, the contents of area MSW ₀ are stored in register I. In step 20, it is judged whether the content of the register I is "FF" in hexadecimal display. In other words, it is determined whether or not the stored content of the first area MSW ₀ of the storage area MSW is the data that has been initialized.
If any one of the plurality of operation switches (SW _{0 to} SW ₁₅ ) is in the ON state, the number of the operation switch is stored in the area MSW ₄ , so that the content of the register I is not “FF”. Is determined, step 21
Go to.

Operation for Determining Load Number to be Turned On In steps 21 to 24, it is determined whether or not each 4-byte data corresponding to the operation switch number stored in the register I is "FF". That is, step 21
1-byte data designated by the table M (J, I) in the ROM 13 (where the value of I corresponds to the operation switch number, and the value of J is the number of the byte of the data corresponding to the operation switch). Is read out, and it is determined whether the data is "FF". If M (J,
If the data in the table of I) is not "FF", there is a load to be driven, so the process proceeds to step 22. In step 22, the data of the table M (J, I) in the ROM 13, for example M (0,0), the terminal MPU20.
Data for turning on load 0 of A (RS # 0) is read and written in area MOUT ₀ . Step 23
At, 1 is added to the contents of register J. In this state, the table to be read next from the ROM 13 is M
It becomes (1, 0). In step 24, register J
Is determined to be 4 or not. When it is determined that J = 4 is not satisfied, the process returns to step 21. Then, until any of the data of the 4-byte table corresponding to the operation switch (SW ₀ ) becomes “FF”, or the value of J becomes 4
The operations of steps 21 to 24 are repeated until.

Then, in step 25, 1 is added to the value of the register K. In step 26, it is determined whether or not the content of the register K is the total number (for example, 16) of the operation switches, and if it is determined that it is not the maximum number, the process returns to step 18. Then, if the numbers of the operation switches in the ON state are stored in all of the areas MSW _{0 to} MSW ₁₅ , the operations of steps 18 to 26 are repeated as many times as the number of ON states of the operation switches.

On the other hand, if the number of operation switches in the ON state is less than the total number, the area MSW corresponding to the number of operation switches in the ON state
After the operation of writing the data (logic “1”) for turning on the bit corresponding to each load included in each of the terminals MPU 20A to 20D based on the content of _K, the content of the register I in step 20 is performed. Is determined to be “FF” and the process proceeds to step 27.

Driving of Corresponding Load In step 27, the driving of the load corresponding to master MPU 10 is performed based on the data of each bit in area MOUT ₄ .

1 Frame Data Transmission Operation Then, in steps 28 to 32, the area MOUT ₀ to
The contents of MOUT ₃ are sequentially transmitted according to a predetermined transmission format. Specifically, in step 28, 0 is set in the register K. This is to specify 20A (RS # 0) as the terminal MPU to which data should be transmitted first. Then, it proceeds to step 28a and registers K
Of the area D _K is determined, that is, whether or not the terminal MPU with the terminal number K is already registered as an abnormal terminal. If a match is determined, the process proceeds to step 28b and the corresponding terminal system power supply circuit is shut down. As a result, the abnormal terminal is disconnected from the master MPU 10. On the other hand, if no match is determined, the process proceeds to step 29. In step 29, the terminal M
One frame data to be transmitted to the PU 20A is edited. In this 1-frame data, the destination data SDA is #
0, the source data SSA is # 4 representing the master MPU 10, the control data is the contents of the area MOUT ₀ , and the BCC code is added to these data.
In step 30, the one-frame data edited in step 29 is transmitted to each terminal MPU 20A to 20D via the optical fiber 331 included in each cable 30A to 30D.

At this time, each of the terminals MPU 20A to 20D
As shown in FIG. 11, in step 51, it is judged whether or not the destination data SDA specifies its own terminal number (#K). If the destination data SDA is # 1, the CPU 21 included in the terminal MPU 20A determines that it has been designated, and proceeds to step 52. In step 52, the BCC code is judged,
If it is determined that there is no error, the process proceeds to step 53. In step 53, the received data (ie area MO
The control data stored in the UT ₀ ) is stored in the reception data storage area 24a of the RAM 24. In step 54, the contents of the area 24a are given to the driver 42 via the input / output interface 26. Driver 42
Is the power switch 430-4 based on the control data.
One of the 35 corresponding to the load to be driven is turned on to drive the load. In step 55, input signals from various sensors as an example of a detection target connected to the input / output interface 26 are read and stored in the transmission data storage area 24b (not shown) included in the RAM 24. After that, the CPU 21 determines in step 56 whether or not the bowling signal specifies itself, and waits until its own terminal number (# 0) is specified.

On the other hand, on the master MPU 10 side, after transmitting one frame data, the contents of the register K are set to 1 in step 31.
Is added to the end MP to send 1 frame data next
The terminal number of U20B is stored in the register K. In step 32, it is determined that the content of the register K is not 4, and the process returns to step 29. Then, the operations of steps 29 to 32 are repeated in the order of the remaining terminals MPU 20B to 20D, and the other terminals MPU are accordingly accompanied.
20B to 20D perform the operations of steps 51 to 56 shown in FIG. As a result, each of the terminals MPU20A-2
Control data for driving the load corresponding to 0D is transmitted to each terminal MPU.

Then, when one frame data is transmitted to all the terminals MPU 20A to 20D, it is determined in step 32 that the content of the register K has become 4, and step 3
Go to 3.

Data Reception and Abnormality Control Operation The subroutine of step 33 is executed according to the flow chart shown in FIG. That is, 0 is set in the register K in step 101. The register K
The following explanation will be easily understood by considering that the setting value of specifies the terminal number. Then, step 10
After the second operation (described later), in step 103,
It is determined whether the set value of the register K matches the set content of the area D _K , that is, whether the terminal MPU with the terminal number K is already registered as an abnormal terminal. Initially,
Since the area D _K is set with "FF" in hexadecimal (which is initially set in step 10 above), mismatch is determined. Then, the process proceeds to step 104, where the terminal number corresponding to the contents of the register K (first is the terminal MPU).
# 0) designating 20A is transmitted. Accordingly
The CPU 21 of the terminal MPU 20A executes step 56 (first
(See FIG. 1), it is determined that the boring signal specifies itself, and the routine proceeds to step 57. In step 57, one frame data (including detection data) stored in the transmission data storage area 24b is transmitted to the transmission control circuit 25, the transmission buffer 55a, the optical coupler 56a,
It is transmitted to the transmission control circuit 15 via the optical fiber 332, the optical coupler 57a, and the reception buffer 58a.

Here, in the 1-frame data transmitted from the terminal MPU 20A (see FIG. 7), the destination data SDA is # 4, the source data SSD is # 0, and the control data is the detection target corresponding to the terminal MPU20A. Data indicating the operating state of the above, and the BCC code is added to them.

On the other hand, in the CPU 11, in step 105, the terminal M
Receive 1 frame data from PU. Then, the process proceeds to step 106, and it is determined whether or not there is an error in the BCC code included in the received one frame data. BC
If it is determined that there is no error in the C code, step 107
Proceeds to only the data portion representing the operation state of the detection target of the received data of one frame data is written to area MA K _(first time area MA _0). And step 1
In step 08, it is determined whether the stored contents of the area MA _{0 and} the stored contents of the area MB ₀ match. First time since the "00" in the area MB ₀ 16 hexadecimal is initially set, both stored contents becomes necessarily different values, Step 1
Proceed to 11. In step 111, the stored contents of the area MA ₀ is transferred to the area MB _0. Then, in step 112, 1 is added to the content of the register K.
Then, in step 113, whether the content of the register K is 4 or not, in other words, all the terminals MPU 20A to 20
A bowling signal is transmitted to D, and it is determined whether or not received data is received. Since the content of the register K is 1 at the first time, the process returns to step 102 again. And each terminal MP
The above operation is repeated for each of U20B to 20D.

Even if the above-described operation is performed for each of the terminals MPU 20A to 20D for the first time, none of them goes through step 109, so that the areas MRCV _{0 to} MRCV ₃ are all initialized to hexadecimal number “00”. It remains. Therefore, even if the operations of steps 40 and 41 are executed after the operation of step 113, the display or instruction on the controlled object 2B is not performed.

When the operation of FIG. 9 the routine again one round is performed, if a match is determined the content of the area MA _K (receiving data currently) and area MB K _(data received the last time), step Go to 109. In step 109, it transfers the contents of the area MA _K in area MRCV _K. Then, the process proceeds to step 110, in the area MA _K 0
Is set. Similar to the previous time, each terminal MPU20A ~ 2
When the data reception from 0D is completed, the operations of steps 40 and 41 are executed. This time, area, MRCV
_Since data is stored in _{0 to} MRCV ₃ , the controlled object 2B is controlled accordingly.

That is, in step 40, the corresponding indicator lamp included in the controlled object 2B is lit and displayed based on the content of the area MRCV ₀ . In addition, the terminal MPU20
If the detection targets of B and 20C are the water temperature and the amount of gasoline, respectively, the respective data are the areas MRCV ₀ and MRC.
Stored at V ₂ . Therefore, in step 41, the water temperature is instructed to the water temperature gauge of the control target 2B based on the data stored in the area MRCV ₀ . Also,
Area MRCV ₂ Based on the stored data,
The remaining gasoline amount is instructed by the gasoline amount indicator of the control target 2B.

As described above, in this embodiment, each terminal MPU 20A ...
The controlled object 2B is controlled only when the data received from 20D and the previously received data match. This is because the data transmitted from each terminal MPU to the master MPU 10 becomes unreliable due to chattering immediately after the states of the sensors and switches connected to each terminal MPU change. That is, in this embodiment, the time required for the first execution of the routine of FIGS. 9 and 10 (for example, 20 ms) is the malfunction prevention time due to chattering.

Next, the operation when it is determined in step 106 that the BCC code has an error will be described. Note that such a situation can occur even when the routine is first executed. First, in step 114, one of the illuminated push button switches 3A to 3D corresponding to the terminal number #K (specified by the register K) is turned on. Then, the process proceeds to step 115 and 0 is set in the area MRCV _K. This prohibits the display or instruction of data from the terminal MPU having the terminal number #K. After that, the process proceeds to step 112 described above.

The illuminated push button switch turned on in step 114 is turned off in step 102 when the operation shown in FIG. 9 is executed next time. Therefore, when it is determined that the BCC code included in the data received from a certain terminal MPU is erroneous, the corresponding illuminated push button switch executes the routine shown in FIGS. 8 and 9 almost once. The light is turned on (for example, 20 ms). Here, when an error occurs in the BCC code temporarily due to the inclusion of noise, the corresponding illuminated push-button switch is only turned on once. Therefore, the illuminated push button switch is only lighted for a moment and is barely visible to the driver. On the other hand, when an abnormality occurs in a certain terminal MPU, the frequency of occurrence of an error in the BCC code from that terminal MPU increases. Therefore, the lighting ratio of the corresponding illuminated push-button switch (the ratio of the lighting time to the off time) is increased. For example, when the BCC code error occurs continuously, the illuminated push button switch remains almost lit. Therefore, the driver can visually recognize the lighting of the illuminated push button switch.

When the driver recognizes that the illuminated push button switch is lit, he / she presses the corresponding illuminated push button switch. By pressing the illuminated push button switch, the CPU
21 performs an interrupt operation as shown in FIG. That is, in step 201, the terminal number #K corresponding to the pressed illumination type push button switch is set in the register K. Then, the process proceeds to step 202, and the illuminated push-button switch is turned off. Next, in step 203, the contents of register _K are transferred to area D _K. As a result, the number of the terminal in which the abnormality has occurred is registered. Then, the process proceeds to step 204 and the area M
RCV _K is set to 0.

After that, the operation returns to that before interruption.

In the above-mentioned interrupt operation, if the number of the terminal in which the abnormality has occurred is registered, step 103 is performed before the boring and data reception to the corresponding terminal in FIG.
It is determined that there is registration. In this case, the bowling and the reception of data are not performed, and the process directly proceeds to step 112. That is, the terminal MPU registered in the area D _K
Reception of data from is prohibited. This prohibits control by incorrect data.

In addition, in the above-described embodiment, the illuminated push button switch 3 is used.
Although the number of the terminal in which an abnormality has occurred due to the interruption operation by pressing A to 3D is registered, this registration operation may be performed in the flowchart shown in FIG. The registration operation may be performed with 115. That is, step 11
After the operation of 4, it is determined whether or not the illuminated push button switch corresponding to the terminal number #K (specified by the register K) is pressed. If it is determined that the illuminated push button switch is pressed, the terminal number is registered in the area D _K. Then, the corresponding illuminated push button switch is turned off, and the process proceeds to step 115. On the other hand, if it is not judged that the illuminated push button switch is pressed, step 11 is directly executed.
Operation 5 is performed. In this way, even if pressed by mistake button switch illuminated push off, the terminal number of the corresponding is not registered in the area D _K. Therefore,
It is possible to prevent the reception of data from a normal terminal MPU from being prohibited due to an erroneous operation.

As described above, according to the present invention, the corresponding lighting display means is lit only for a short time in response to the occurrence of an error in the data transmitted from the terminal control unit to the central control unit. It is possible to easily distinguish the temporary data error caused by the error from the data error caused by the abnormality of the terminal control unit. Further, according to the present invention, the control based on the data from the corresponding terminal control unit is prohibited in response to the command from the manually operable command unit, so that the driver displays, for example, the lighting display unit. If it is recognized that an abnormality has occurred in a certain terminal control unit, the operation of the command means can prohibit the acquisition of data from that terminal control unit.

[Brief description of drawings]

FIG. 1 is a block diagram showing the outline of an embodiment of the present invention. 2A to 2D are diagrams schematically showing an example of a terminal MPU as an example of a terminal control unit and a control target connected thereto, and FIG. 2E is an input / output of a master MPU as an example of a central control unit. It is a figure which shows the relationship between a terminal and each control object. FIG. 3 is a detailed view of the cable. FIG. 4 is a concrete circuit diagram of an embodiment of the present invention. FIG. 5 is a diagram schematically showing the storage area of the ROM 13. FIG. 6 is a diagram schematically showing the storage area of the RAM 14. FIG. 7 is a time chart for explaining a specific operation of the embodiment of the present invention. 8 to 11 are flow charts for explaining the operation of the embodiment of the present invention, particularly the eighth embodiment.
1 to 10 show flowcharts on the master side.
FIG. 1 shows a flowchart on the terminal side. In the figure, 2A is an operating means, 2B is a controlled object, 3A-
3D is an illuminated push button switch, 10 is a master MPU
(Central control unit), 20A to 20D are terminals MPU (terminal control unit), 30A to 30D are cables, 33 is an optical fiber, and 40A to 40D are control targets / detection targets.

Claims (1)

[Scope of utility model registration request] 1. A plurality of various control objects and information detecting means mounted on an automobile are grouped according to their close arrangement positions, and a certain number of control objects and information detecting means included in each group are aggregated for each group. In the wired system, a device for intensively detecting an operation abnormality, wherein a terminal control unit provided for each group, and an operating state of a certain load among a plurality of loads included in each terminal control unit Operating means for selecting, which is provided in common to each of the terminal control units, derives a control signal for controlling the operating state of the load to each terminal control unit based on the operating state of the operating means, and controls each Central control unit for remotely controlling the target, lighting display means provided corresponding to each of the terminal control unit,
And a plurality of manually operable command means provided corresponding to each of the terminal control units, wherein the terminal control unit detects the information detection unit connected to the central control unit with the terminal control unit. And a means for transmitting data, wherein the central control unit responds to an error occurrence of the data based on an output of the data error detecting unit and a unit for detecting that the data received from each of the terminal control units has an error. Means for turning on the lighting display means corresponding to the terminal control section that has transmitted the error data for a short time, and means for prohibiting control by the data from the corresponding terminal control section in response to the instruction of the instruction means. An abnormality detection device in an integrated wiring system for an automobile, including: