JP2004153650A - Network communication device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently check the presence/absence of bit sticking in a register. <P>SOLUTION: An access right to a message storing portion 16 is switched between a communication processing portion 12 and an check processing portion 13 by an operation switching portion 11, whereby a switchover between a communication mode transmitting/receiving a control message and a check mode for checking a register is realized. The check processing portion 13 writes a predetermined pattern in the register of a mail box in the check mode, reads the same, and determines whether or not the written pattern is coincident with the read pattern, thereby checking the presence/absence of bit sticking. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a network communication apparatus for transmitting and receiving, by CAN communication, a message including data stored in a data register and ID information defining a type of the data stored in an ID information register, and more particularly, to a method for fixing bits of a register used for CAN communication. The present invention relates to a testable network communication device.
[0002]
[Prior art]
In recent years, with the development of electronic devices, the use of electronic devices has become increasingly diverse. For example, in automobiles, electronic devices are used for electric systems such as lights, engine ignition control, gear box control, anti-lock braking systems, and the like. Conventionally, these electronic devices have been used independently. However, as the number of mounted electronic devices increases, the number of wirings increases, sensors overlap, and the like. In order to obtain higher performance, it is necessary to integrate and control these electronic devices.
[0003]
In order to realize integration of electronic device control, a communication network for performing data communication between electronic devices is required. Electronic devices mounted on automobiles are often used in electrically poor environments such as high temperatures and high vibrations.In addition, each electronic device is manufactured independently and mounted as needed, so the network configuration Are diverse. Therefore, this communication network is required to withstand a poor electrical environment and to have high flexibility.
[0004]
As a network system satisfying this requirement, CAN (Controller Area Network) has been developed. CAN is a serial bus system to which electronic devices are connected, and standards are defined by the International Organization for Standardization. In this CAN, an error detection technique has been studied in order to ensure high reliability (for example, see Patent Document 1).
[0005]
In addition, in order to ensure the flexibility of the network configuration, the CAN adds ID information indicating the content of the message, and determines the destination of the message based on the ID information. That is, the content of the message is defined by the ID information and transmitted to all the electronic devices simultaneously, and each electronic device determines whether to receive the message based on the ID information. Hereinafter, the operation of simultaneously transmitting a message to a plurality of electronic devices connected to the CAN is referred to as multicast.
[0006]
This CAN communication method will be described with reference to FIG. In FIG. 8, in-vehicle computers 101, 102, and 103 as electronic devices are connected to a CAN 105, respectively. The in-vehicle computer 101 includes an engine control module 101a and a communication module 101b. Similarly, the on-board computer 102 includes a brake control module 102a and a communication module 102b, and the on-board computer 103 includes an electrical control module 103a and a communication module 103b.
[0007]
The engine control module 101a includes a sensor that detects the number of revolutions of the engine, and controls the ignition timing based on the number of revolutions of the engine. Further, the engine control module 101a transmits the engine speed to the CAN 105 via the communication module 101b. At this time, the communication module 101b multicasts to the CAN 105 a message in which data indicating the engine speed is added with ID information indicating that the data is the engine speed.
[0008]
As described above, the message transmitted by the communication module 101b has no information indicating its destination, and is transmitted to all the in-vehicle computers, in FIG. 8, both the in-vehicle computers 102 and 103. When receiving the message, the communication modules 102b and 103b confirm the ID information, recognize that the message has data of the engine speed, and determine whether or not to receive the message.
[0009]
For example, the in-vehicle computer 102 is a computer that controls a brake, and thus needs an engine speed for control. Therefore, the communication module 102b receives the message based on the ID information and transmits the engine speed to the brake control module 102a. The brake control module 102a adjusts the brake based on the engine speed. On the other hand, the computer 103 is a computer that controls the electrical system, and does not require engine rotation for control. Therefore, the communication module 103b discards the message based on the ID information and does not transmit the engine speed to the electrical control module 103a.
[0010]
In this way, the content of the message is defined by the ID information and multicast, and each communication module determines whether or not to receive the message based on the ID information, so that the transmission and reception of the message can be performed without specifying the destination. Can do it. Eliminating the need to specify the destination eliminates the need to modify the hardware and software of each in-vehicle computer even when the network configuration is changed, and allows flexible addition and deletion of in-vehicle computers to and from the network. Network has been realized.
[0011]
Each communication module connected to the CAN 105 uses an ID information register for reading and writing ID information and a data register for reading and writing data when transmitting and receiving messages. For example, the communication module 101b has mailboxes 121 to 125 and 131 to 133 as shown in FIG. The mailbox 121 has an ID information register 121a for reading and writing ID information and a data register 121b for reading and writing data. Similarly, each of the mailboxes 122 to 124 and 131 to 133 has an ID information register and a data register.
[0012]
This mailbox generally uses an ID information register assigned to each piece of ID information to be used. For example, the mailbox 121 is used to read / write a message whose ID information is “000000000000”, and the mailbox 122 is used to read / write a message whose ID information is “000000000001”.
[0013]
In addition, a mailbox for inspection may be prepared separately from a mailbox for control used for normal network communication. In FIG. 9, mailboxes 121 to 125 are control mailboxes, and mailboxes 131 to 135 are inspection mailboxes. The inspection mailboxes 131 to 135 are assigned to inspection ID information, and are used to determine whether or not the communication function is operating normally.
[0014]
In CAN communication, since the transmission destination of a message is determined by ID information, a flexible configuration is possible. However, at the time of shipment of each vehicle-mounted computer, it is unclear what configuration will be used. Therefore, inspection ID information for inspection before shipment of each in-vehicle computer is set, and communication is performed using the inspection ID information, thereby inspecting the CAN communication function before shipment. Specifically, the transmission / reception of the message having the inspection ID information, that is, the inspection message, is actually performed. If the transmission / reception of the inspection message is normally performed, the communication function of the product operates normally. Was determined to be.
[0015]
[Patent Document 1]
JP 2001-339412 A (Pages 6-8, FIG. 6)
[0016]
[Problems to be solved by the invention]
However, in this conventional network communication device for CAN, since the communication function is confirmed by transmitting and receiving the inspection message, it is strictly and inexpensively determined whether the transmission and reception of the control message can be performed normally. There was a problem that it was not possible.
[0017]
Specifically, “0010000000000” is used as the ID information for inspection, and when communication using the ID information for inspection is normally performed, it is conventionally determined that the communication function is normal. If there is a bit fixation in which a specific bit always outputs the same value in a register for storing ID information used sometimes, an abnormality in this register may be overlooked. For example, if bit sticking occurs in the third bit in the register assigned to ID “000000000111”, “00100000111” will be output during the transmission operation of the control message whose ID information is “000000000111”.
[0018]
As described above, even if the transmission and reception of the message using the test ID information can be normally performed, the communication using the register not assigned to the test ID information, that is, the register used for normal communication control, is performed. Anomalies could occur. In other words, in the test using the test ID information, the propriety of communication itself could be checked, but the operation of the ID information register used for actual communication could not be checked.
[0019]
In the CAN communication, the content of the message is defined and the destination of the message is determined based on the ID information. Therefore, if the ID information is erroneously transmitted, erroneous data will be multicast, which significantly impairs the reliability of the network. It will be. In addition, in order to perform an inspection using a message used for control, it is necessary to connect an electronic device that is a communication partner and to perform an inspection on a control message to be used, which greatly increases the required cost.
[0020]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem of the related art, and has as its object to provide a network communication device capable of inspecting, at a low cost, bit fixation of a register used for transmitting and receiving a control message. I do.
[0021]
[Means for Solving the Problems]
In order to solve the above-mentioned problems and achieve the object, a network communication device according to the present invention is characterized in that a message comprising data stored in a data register and ID information defining a type of the data stored in an ID information register. A network communication device for transmitting and receiving the CAN communication by CAN communication, wherein an inspection state transition unit that transitions to an inspection state, and when the inspection state transition unit transitions to the inspection state, a predetermined pattern is written to the ID information register. Inspection processing means for inspecting whether a read pattern obtained by reading the written pattern from the ID information register matches a write pattern;
It is characterized by having.
[0022]
According to the first aspect of the present invention, the network communication device writes a predetermined pattern in the ID information register, reads the written pattern, compares the written pattern with the read pattern, By checking whether or not the read pattern matches the read pattern, it is configured to perform the check of the bit fixation.
[0023]
Also, in the network communication apparatus according to a second aspect of the present invention, in the first aspect of the present invention, the inspection state transition unit transitions to the inspection state when receiving a message instructing start of the inspection processing. It is characterized by.
[0024]
According to the second aspect of the present invention, when the network communication device receives the message instructing the start of the inspection process, the network communication device shifts to the inspection state and starts the inspection of the ID information register for the bit fixation.
[0025]
Further, in the network communication apparatus according to a third aspect of the present invention, in the first or second aspect of the invention, the inspection processing means further writes a predetermined pattern into the data register, and writes the written pattern into the data register. It is characterized in that it is checked whether or not the read pattern read from the register matches the write pattern.
[0026]
According to the third aspect of the present invention, the network communication device checks the presence / absence of bit fixation in the data register in addition to the ID information register.
[0027]
Also, in the network communication apparatus according to the invention of claim 4, in the invention of claims 1, 2, or 3, the predetermined pattern is a pattern in which a value “0” is continuous, a pattern in which a value “1” is continuous, It is characterized by including a pattern in which “01” is continuous or a pattern in which a value “10” is continuous.
[0028]
According to the fourth aspect of the present invention, the network communication device has a pattern in which the value "0" is continuous, a pattern in which the value "1" is continuous, a pattern in which the value "01" is continuous, or a value in which the value "10" is continuous. The pattern is checked for bit sticking in the ID register and the data register.
[0029]
In the network communication apparatus according to a fifth aspect of the present invention, in the first to fourth aspects, the predetermined pattern includes a pattern of ID information used when actual CAN communication is performed. And
[0030]
According to the fifth aspect of the present invention, the network communication apparatus checks the bit fixation of the ID register and the data register by using the pattern of the ID information used when the actual CAN communication is performed.
[0031]
Further, in the network communication apparatus according to a sixth aspect of the present invention, in the invention of the first to fifth aspects, the inspection processing means determines that the read pattern and the write pattern for the specific pattern do not match. Inspection processing for a specific pattern is repeated a plurality of times, and when it is determined that the patterns do not match continuously for a certain number of times or more, a register abnormality is determined.
[0032]
According to the sixth aspect of the present invention, the network communication device repeats the inspection processing for the specific pattern when the read pattern and the write pattern do not match, and registers the pattern when the read pattern and the write pattern do not match continuously for a certain number of times. Judge as abnormal.
[0033]
Also, in the network communication apparatus according to the invention of claim 7, in the invention of claims 3 to 6, the inspection processing means performs the inspection processing using a pattern in which all bits forming the data register are to be inspected. It is characterized by performing.
[0034]
According to the seventh aspect of the present invention, the network communication device detects the stuck bits using a pattern in which writing is performed for all bits forming the data register.
[0035]
Further, in the network communication apparatus according to the invention of claim 8, in the invention of claims 3 to 7, the inspection processing means may determine a bit used in actual CAN communication among all bits forming the data register. The inspection process is performed using a pattern to be inspected.
[0036]
According to the eighth aspect of the present invention, the network communication apparatus uses a pattern in which writing is performed on bits actually used in CAN communication among a plurality of bits forming data bits, to fix bit fixation. Perform an inspection.
[0037]
According to a ninth aspect of the present invention, in the network communication device according to the third to eighth aspects, when the plurality of pairs of the ID information register and the data register exist, all of the ID information registers And all data registers are to be inspected.
[0038]
According to the ninth aspect of the present invention, when there are a plurality of pairs of the ID information register and the data register, the network communication device checks all the ID registers and the data registers for bit sticking.
[0039]
According to a tenth aspect of the present invention, in the network communication device according to the third to eighth aspects, when the plurality of pairs of the ID information register and the data register exist, the inspection processing means performs actual CAN communication. A pair of an ID information register and a data register to be used is to be inspected.
[0040]
According to the tenth aspect of the present invention, when a plurality of pairs of ID information registers and data registers exist, the network communication device fixes bits to the ID information registers and data registers actually used in CAN communication. Inspection of
[0041]
In the network communication device according to the eleventh aspect of the present invention, in the ninth or tenth aspect, the inspection processing unit determines that there is at least one normal pair among the pair of the ID information register and the data register. In this case, a test result transmitting means for transmitting the test result by the test processing means by CAN communication using the pair of the normal ID information register and the data register is further provided.
[0042]
According to the eleventh aspect of the present invention, when the network communication device has a plurality of ID information registers and data registers, and at least one normal ID register and data register pair exists, the normal ID register And a data register, and transmits a bit fixation inspection result by CAN communication.
[0043]
In a twelfth aspect of the present invention, in the network communication device according to the first to eleventh aspects, the inspection processing means sequentially receives a message including a plurality of patterns for performing the inspection processing by actual CAN communication. In addition, the inspection process is performed using the received patterns.
[0044]
According to the twelfth aspect of the present invention, the network communication apparatus receives the bit sticking inspection pattern by the CAN communication, and checks the bit sticking based on the received pattern.
[0045]
BEST MODE FOR CARRYING OUT THE INVENTION
An on-board computer as a preferred embodiment of a network communication device according to the present invention will be described below with reference to the accompanying drawings. In the first embodiment, a network communication device that executes a register check by a vehicle-mounted computer alone will be described. In the second embodiment, a network communication device that executes a register check via a CAN will be described.
[0046]
(Embodiment 1)
First, a schematic configuration of the on-vehicle computer according to the present embodiment will be described. FIG. 1 is an explanatory diagram illustrating a schematic configuration of the on-vehicle computer according to the present embodiment. In FIG. 1, the in-vehicle computer 1 is connected to an inspection device 6 via a CAN 5. The in-vehicle computer 1 includes an acquisition output processing unit 2, an engine control module 3, and a communication module 3 therein.
[0047]
The input / output processing unit 2 is connected to a sensor that measures the number of revolutions of the engine, an ignition device of the engine, and the like. The input / output processing unit 2 transmits the engine speed measured by a sensor (not shown) to the engine control module 3. The engine control module 3 determines the ignition timing of the engine based on the rotation speed of the engine received from the input / output processing unit 2, and controls an ignition device (not shown) via the input / output processing unit 2. Further, the engine control module transmits the number of revolutions of the engine received from the input / output processing unit 2 to the communication module 4.
[0048]
The communication module 4 includes an operation switching unit 11, a communication processing unit 12, an inspection processing unit 13, an inspection procedure storage unit 14, a message storage unit 16, and a network connection unit 17 therein. The message storage unit 16 further includes mailboxes 21 to 23 used for transmission and reception with the CAN 5. Each of the mailboxes 21 to 23 has an ID information register used for reading and writing ID information and a data register used for reading and writing data.
[0049]
The operation switching unit 11 switches the access right to the message storage unit 16 between the communication processing unit 12 and the inspection processing unit 13. When the vehicle-mounted computer 1 is communicating with another vehicle-mounted computer via the CAN 5 (hereinafter, this state is referred to as a communication mode), the operation switching unit 11 sets the access right to the message storage unit 16 to the communication processing unit 12. Has given to. On the other hand, in a state where the communication function of the on-vehicle computer is being inspected (hereinafter, this state is referred to as an inspection mode), the operation switching unit 11 gives the inspection processing unit 13 an access right to the message storage unit 16.
[0050]
The communication processing unit 12 transmits and receives a message to and from the CAN 5 using a register in the message storage unit 16 when the communication mode state is satisfied, that is, when there is an access right to the message storage unit 16. Specifically, the communication processing unit 12 receives data indicating the number of revolutions of the engine from the engine control module 3, forms a message by adding ID information to the data, and stores the message in the message storage unit 16. The message stored in the message storage unit 16 is transmitted to the CAN 5 at a predetermined timing. Further, the communication processing unit 12 confirms the ID information of the message received from the CAN 5 and stored in the message storage unit 16, and reads out the data of the message when the message is specified to be received by the engine processing module. To the engine control module 3.
[0051]
The inspection device 6 transmits a message instructing the start of the inspection to the CAN 5. The operation switching unit 11 switches from the communication mode to the inspection mode when receiving a message instructing the start of the inspection via the network connection unit 17. The inspection processing unit 13 starts inspecting the register of the message storage unit 16 when the mode is shifted from the communication mode to the inspection mode, that is, when the operation switching unit 11 is given an access right to the message storage unit 16. The inspection of this register is performed according to the inspection procedure data stored in the inspection procedure storage unit 14. Further, when the inspection processing is completed, the inspection processing unit 13 outputs the inspection result, and notifies the operation switching unit 11 of the completion of the inspection. The operation switching unit 11 switches from the inspection mode to the communication mode when notified of the end of the inspection from the inspection processing unit 13.
[0052]
The inspection of the register by the inspection processing unit 13 will be described in detail. The inspection of the register by the inspection unit 13 is performed by writing a predetermined pattern to the register, reading this data, and comparing the value of the written data with the value of the read data. As the predetermined pattern, a pattern in which “000...” And a value “0”, that is, a continuous dominant, and a pattern in which “1111...” And a value “1”, that is, a continuous recessive pattern are used. .
[0053]
Reading and writing are performed on the dominant continuous pattern and the recessive continuous pattern, respectively, and when reading and writing are normally performed, each register can output the dominant and the recessive.
[0054]
Further, as the predetermined pattern, a pattern in which “0101...” And dominant and recessive alternately continue, and a pattern in which “1010...” And recessive and dominant alternate alternately may be used. When reading and writing can be normally executed for each of the dominant-recessive pattern and the recessive-dominant pattern, each register can output a dominant and a recessive pattern.
[0055]
Note that an abnormality may occur in which one register is affected by another register such as an adjacent register, and always outputs the same value as the other register or the opposite value of the other register. When detecting such an abnormality, it is desirable to execute reading and writing for each of the dominant continuous pattern, the recessive continuous pattern, the dominant-recessive continuous pattern, and the recessive-dominant continuous pattern.
[0056]
Information on the contents of the test, such as which pattern to use as a pattern to read from and write to this register, and in what order, are described in the test procedure data 15. Further, a plurality of inspection procedures may be stored in the inspection procedure data so that the inspection content can be selected as necessary, such as the time available for the inspection and the importance of the inspection object. It may be rewritable.
[0057]
Next, with reference to FIG. 2, an operation process of the register check in the communication module 4 will be described. FIG. 2 is a flowchart illustrating an operation process of the register check in the communication module 4. In FIG. 2, the communication module 4 first receives a test start message instructing a test start from the CAN 5 (step S101). Next, the operation switching unit 11 switches the access right to the message storage unit 16 from the communication processing unit 12 to the inspection processing unit 13, that is, switches from the communication mode to the inspection mode (step S102).
[0058]
Subsequently, the inspection processing unit 13 designates the first mailbox among the mailboxes of the message storage unit 16 as an inspection target (step S103). Next, the inspection processing unit 13 writes the dominant continuous pattern into the register of the mailbox to be inspected (step S104). Thereafter, the inspection processing unit 13 reads the written data, and determines whether the read data is a dominant continuous pattern, that is, whether the data has been normally read (step S105).
[0059]
If the data cannot be read normally (No at Step S105), the inspection processing unit 13 outputs that there is an abnormality in the mailbox to be inspected (Step S116). On the other hand, when the data can be read normally (step S105, Yes), the inspection processing unit 13 writes the recessive continuous pattern into the register of the mailbox to be inspected (step S106). Thereafter, the inspection processing unit 13 reads the written data, and determines whether the read data is a recessive continuous pattern, that is, whether the data has been normally read (step S107).
[0060]
If the data could not be read normally (No at Step S107), the inspection processing unit 13 outputs that there is an abnormality in the mailbox to be inspected (Step S116). On the other hand, when the data can be read normally (step S107, Yes), the inspection processing unit 13 writes the dominant-recessive pattern to the register of the mailbox to be inspected (step S108). Thereafter, the inspection processing unit 13 reads the written data, and determines whether the read data is a dominant-recessive pattern, that is, whether the data has been normally read (step S109).
[0061]
If the data could not be read normally (No at Step S109), the inspection processing unit 13 outputs that there is an abnormality in the mailbox to be inspected (Step S116). On the other hand, when the data can be normally read (step S109, Yes), the inspection processing unit 13 writes the recessive-dominant pattern into the register of the mailbox to be inspected (step S110). Thereafter, the inspection processing unit 13 reads the written data, and determines whether the read data is a recessive-dominant pattern, that is, whether the data has been normally read (step S110).
[0062]
If the data could not be read normally (No at Step S111), the inspection processing unit 13 outputs that there is an abnormality in the mailbox to be inspected (Step S116). On the other hand, when the data can be read normally (step S111, Yes), the inspection processing unit 13 determines whether the inspection has been completed for all the mailboxes (step S112).
[0063]
If there is a mailbox that has not been checked (No at Step S112), the check processing unit 13 specifies the next mailbox as a check target (Step S115), and proceeds to Step S104. On the other hand, when the inspection is completed for all the mailboxes (Step S112, Yes), the inspection processing unit 13 outputs that there is no abnormality in the mailbox (Step S113). Further, after step S116 or step S113, the operation switching unit 11 switches the mode from the inspection mode to the communication mode, and ends the processing.
[0064]
Here, referring to FIG. 3, the range of the register in which the inspection processing unit 13 performs the inspection will be described. FIG. 3 is an explanatory diagram illustrating the inside of the message storage unit 16. 3, the message storage unit 16 has mailboxes 21 to 24, 31, and 32. Each mailbox has an ID information register and a data register. Here, among the mailboxes, the mailboxes 21 to 23 are assigned to the control messages. In addition, mailboxes 31 and 33 are assigned to the inspection message.
[0065]
That is, no ID information is assigned to the mailbox 24, and the communication processing unit 12 does not use the mailbox 24. Therefore, by omitting the check of the register included in the mailbox 24, the time required for the check can be reduced.
[0066]
Although the ID information of the message is defined as 11 bits, the number of bits in the data portion of the message is variable. Therefore, the ID information registers 21a, 22a, and 23a need to read and write the test pattern for all the bits, but the data registers 21b, 22b, and 23b do not read and write the bits used by the communication processing unit 12. By selectively reading and writing patterns, the processing amount required for inspection can be reduced.
[0067]
In FIG. 3, the inspection for the unused mailbox and the unused register bit is omitted, so that the inspection range 16a to be inspected is reduced, and the time and processing capacity required for the inspection are reduced.
[0068]
Next, the output of the inspection result by the inspection processing unit 13 will be described. The output of the inspection result may be notified by some output means provided in the on-vehicle computer 1, or may be output via the CAN 5. When outputting the inspection result via the CAN 5, it is necessary that at least one normally functioning mailbox exists. Therefore, it is necessary to provide a notification means when there is no normally functioning mailbox, or to provide a mechanism for determining that there is an abnormality in the mailbox when there is no result notification message within a predetermined time from the start of the inspection. is there.
[0069]
FIG. 4 shows the processing operation of the communication module 4 when notifying the inspection result via the CAN 5. In FIG. 4, first, the communication module 4 receives the inspection start message (step S201), and switches from the communication mode to the inspection mode (step S202). Next, the first mailbox is specified as the inspection target (step S203), and the dominant continuous pattern is written in the inspection target mailbox (step S204).
[0070]
Next, the written pattern is read, and it is determined whether or not the pattern was successfully read (step S205). If the pattern was successfully read (Yes in step S205), the recessive continuous pattern is stored in the mailbox to be inspected. Write (step S206). Further, the written pattern is read, and it is determined whether or not the pattern was successfully read (step S207).
[0071]
If the recessive continuous pattern can be read normally (step S207, Yes), a dominant-recessive pattern is written to the mailbox to be checked (step S208), and it is confirmed whether the written pattern can be read normally (step S208). S209). If the dominant-recessive pattern can be read normally (step S209, Yes), the recessive-dominant pattern is written into the mailbox to be checked (step S210), and the written pattern can be read and read normally. It is determined whether or not it is (step S211).
[0072]
If the dominant-recessive pattern has been read normally (step S211, Yes), it is determined whether the inspection has been completed for all mailboxes (step S212). If there is a mailbox for which inspection has not been completed (No in step S212), the next mailbox is designated as an inspection target (step S215), and the process proceeds to step S204, where inspection has been completed for all mailboxes. If so, the fact that there is no abnormality in the mailbox is transmitted via the CAN 5 (step S213).
[0073]
On the other hand, when the written pattern cannot be read normally (step S205, No, step S207, No, step S209, No, step S211, No), the inspection processing unit determines whether there is a normal mailbox. A determination is made (step S217). If there is a normal mailbox (step S217, Yes), the inspection processing unit 13 transmits information on the abnormality of the mailbox to the CAN 5 using the normal mailbox (step S218). On the other hand, when there is no normal mailbox (step S217, No), the inspection processing unit 13 outputs that there is an abnormality in the mailbox to be inspected by a predetermined notification unit (step S216).
[0074]
After outputting the inspection result to the CAN 5 (steps S213 and S218) or outputting the inspection result by a predetermined notifying means (step S16), the communication operation switching unit 11 switches from the inspection mode to the communication mode. (Step S214), the process ends.
[0075]
Next, a method of checking a register will be further described. The inspection processing unit 13 performs a predetermined pattern read / write operation with respect to the register, and determines whether the mailbox is normal based on the read result. If the operation is not performed normally, the read / write operation of the pattern may be recursively repeated, and if a predetermined number of read / write operations have failed consecutively, it may be determined that the mailbox has an abnormality.
[0076]
FIG. 5 shows a processing operation of the communication module 4 when the erroneous determination prevention function is provided. In FIG. 5, the communication module 4 receives the inspection start message from the CAN 5 (step S301), switches to the inspection mode (step S302), and designates the first mailbox as an inspection target (step S303).
[0077]
Thereafter, the dominant continuous pattern is written (step S305), and it is determined whether the pattern can be normally read (step S305). Here, when the data cannot be read normally (No at Step S305), the inspection processing unit 13 checks whether the reading has failed consecutively a predetermined number of times (Step S321), and the number of reading failures reaches the predetermined number. If it is less than the number of times (step S321, No), the dominant continuous pattern is written again to the mailbox to be inspected (step S304).
[0078]
On the other hand, if the dominant continuous pattern can be read normally (step S305, Yes), the inspection processing unit 13 writes the recessive continuous pattern into the mailbox to be inspected (step S306), and determines whether or not it can be read normally. (Step S307). Here, when the data cannot be read normally (No at Step S307), the inspection processing unit 13 checks whether the reading has failed consecutively for a predetermined number of times (Step S322), and the number of times of the reading failure is a predetermined number. If the number is less than the number of times (step S322, No), the recessive continuous pattern is written into the mailbox to be inspected again (step S306).
[0079]
On the other hand, when the recessive continuous pattern can be read normally (step S307, Yes), the inspection processing unit 13 writes the dominant-recessive pattern into the mailbox to be inspected (step S308), and determines whether or not it can be read normally. Is determined (step S309). Here, when the data cannot be read normally (No at Step S309), the inspection processing unit 13 checks whether the reading has failed consecutively for a predetermined number of times (Step S323), and the number of times of the reading failure is a predetermined number. If the number is less than the number of times (step S323, No), the dominant-recessive pattern is written into the mailbox to be checked again (step S308).
[0080]
On the other hand, when the dominant-recessive pattern can be read normally (step S309, Yes), the inspection processing unit 13 writes the recessive-dominant pattern into the mailbox to be inspected (step S310) and determines whether the pattern can be read normally. Is determined (step S311). Here, when the data cannot be read normally (step S311, No), the inspection processing unit 13 checks whether the reading has failed consecutively for a predetermined number of times (step S324), and the number of times of the reading failure is a predetermined number. If the number is less than the number of times (step S324, No), the recessive-dominant pattern is written into the mailbox to be inspected again (step S310).
[0081]
On the other hand, when the recessive-dominant pattern has been read normally (step S311, Yes), the inspection processing unit 13 determines whether the inspection has been completed for all the mailboxes (step S312), and the inspection has not been performed. If there are any remaining mailboxes (step S312, No), the next mailbox is designated as an inspection target (step S315), and the process shifts to step S304. If all mailboxes have been inspected (step S315). (S312, Yes), and output that there is no abnormality in the mailbox (step S313).
[0082]
Further, when reading of any one of the patterns has failed consecutively a predetermined number of times (Step S321, Yes, Step S322, Yes, Step S323, Yes, Step S324, Yes), the inspection processing unit 13 sets the mailbox to be inspected. Is output (step S316). After the end of step S313 or the end of step S316, the operation switching unit 11 switches from the inspection mode to the communication mode (step S314), and ends the operation processing.
[0083]
As described above, in the first embodiment, the control message is transmitted and received by switching the access right to the message storage unit 16 between the communication processing unit 12 and the inspection processing unit 13 by the operation switching unit 11. By switching between the communication mode and the inspection mode for inspecting the register, and by reading and writing a predetermined pattern from / to the mailbox in the inspection mode, it is possible to confirm whether each mailbox functions normally.
[0084]
Also, by using a dominant continuous pattern, a recessive continuous pattern, a dominant-recessive pattern, and a recessive-dominant pattern as a pattern used for inspection, it is possible to confirm that no bit sticking has occurred in a register of a mailbox, It can be confirmed that the value of each register does not depend on the adjacent register.
[0085]
Further, the inspection is efficiently performed by selectively inspecting the mailboxes to which the ID information is assigned, and selectively inspecting a range expected to be used in the data register of each mailbox. be able to.
[0086]
Further, when an abnormal mailbox is detected in a state where at least one normal mailbox is present as a result of the mailbox inspection, the CAN communication is performed by transmitting the inspection result to the CAN using the normal mailbox. Inspection results can be transmitted and received via the PC.
[0087]
Furthermore, when data cannot be read normally during mailbox inspection, a predetermined pattern of reading / writing to the mailbox is recursively executed. By determining that there is, erroneous determination can be prevented.
[0088]
(Embodiment 2)
In the first embodiment, the network communication device that executes the register check by the vehicle-mounted computer alone has been described. In the second embodiment, the network communication device that executes the register check through the CAN will be described.
[0089]
In the second embodiment, the in-vehicle computer and the inspection apparatus respectively store the same inspection procedure data, transmit an inspection message in accordance with the inspection procedure data, and check the received message content for the inspection procedure data. I refer to it. FIG. 6 is a schematic configuration diagram illustrating a schematic configuration of the in-vehicle computer 41 and the inspection device 51 according to the second embodiment. Note that the same components as those of the on-vehicle computer 1 shown in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0090]
6, the inspection device 51 includes a network connection unit 52, an inspection execution unit 3, an inspection procedure storage unit 54, and a message storage unit 56 therein. The in-vehicle computer 41 includes an inspection processing unit 43 and an inspection procedure storage unit 44. Here, the inspection procedure storage unit 44 and the inspection procedure storage unit 54 store the same inspection procedure data 45.
[0091]
FIG. 7 shows an operation process in the inspection of the in-vehicle computer 41 via the CAN 5 using the in-vehicle computer 41 and the inspection device 51. In FIG. 7, first, the test execution unit 53 of the test apparatus 51 transmits a message instructing the start of the test via the network connection unit 52 (step S401). The operation switching unit 11 of the in-vehicle computer 1 receives the inspection start message (step S501), gives the access right to the message storage unit 16 to the inspection processing unit 43, and shifts from the communication mode to the inspection mode (step S502). .
[0092]
On the other hand, after transmitting the test start message (step S401), the test execution unit 53 transmits a message for test to the CAN 5 according to the test procedure data 45 (step S402). The inspection executing unit 53 uses the mailbox 61 of the message storage unit 51 for transmitting the inspection message.
[0093]
The inspection processing unit 43 receives the inspection message from the CAN 5, and temporarily stores the message in the message storage unit 16 (Step S503). Further, the inspection processing unit 43 reads the stored message (Step S504), and compares whether the content of the read inspection message is the same as the content stored in the inspection procedure data 45 (Step S505). When the read inspection message is not the same as the content stored in the inspection procedure data 45 (Step S505, No), the inspection processing unit 43 outputs that there is an abnormality in the mailbox (Step S509).
[0094]
On the other hand, when the read inspection message is the same as the content stored in the inspection procedure data (step S505, Yes), the inspection processing unit 43 transmits the inspection message based on the inspection procedure data 45 (step S506). ), And output that there is no abnormality to the mailbox (step S507). After outputting the inspection result of the mailbox (Step S507, Step S509), the operation switching unit 11 switches from the inspection mode to the communication mode (Step S508), and ends the processing operation.
[0095]
On the other hand, the inspection execution unit 53 receives the inspection message transmitted by the on-vehicle computer 41 (step S403), and writes the message in the mailbox of the message storage unit 56. Further, the inspection execution unit 53 reads out the message written in the mailbox and compares it with the inspection procedure data 45 (Step S404). If the read message is the same as the content stored in the inspection procedure data 45 (step S404, Yes), the inspection execution unit 53 outputs no abnormality to the mailbox (step S405), and ends the processing operation. If the read message is not the same as the content stored in the inspection procedure data 45 (No at Step S404), the inspection executing unit 53 outputs that there is an abnormality in the mailbox (Step S406), and ends the processing operation. .
[0096]
As described above, in the in-vehicle computer 41 according to the second embodiment, the operation switching unit 11 switches the communication mode from the communication mode to the inspection mode, and transmits / receives a message to / from the inspection device 6 in the inspection mode. The inspection can be performed using the defined ID information. In this inspection mode, the ID information can be handled as a simple bit string without being used for identifying data contents or specifying a transmission destination. Further, regarding the contents of the message to be transmitted and received, since the inspection procedure data 45 determined in advance is shared between the inspection procedure storage unit 44 and the inspection procedure storage unit 54, it is determined whether the received message is normal. , And the content of the message to be transmitted.
[0097]
Here, as the message to be transmitted and received, ID information defined in the communication mode may be used, or a predetermined pattern such as a dominant continuous pattern may be used.
[0098]
In the first and second embodiments, the mode is shifted to the inspection mode when the inspection start message is received via the CAN 5. However, the start of the inspection mode does not necessarily have to be based on the inspection start message. Alternatively, the start of inspection may be directly input to the on-board computer, or may be input via a network different from CAN.
[0099]
Further, the contents of the data read / written to / from the register as the inspection processing are not limited to the patterns shown in the first and second embodiments and the ID information defined in the communication mode, but may be arbitrary patterns or IDs. What is necessary is just to determine by information and its combination.
[0100]
Further, in the first and second embodiments, when any one of the plurality of mailboxes has an abnormality, "abnormal" is output and the inspection is terminated. With this configuration, it is possible to prevent further inspection of the network communication device having an abnormality in the mailbox and to improve the inspection efficiency, but the use of the present invention is limited to this configuration. It is not done. For example, the configuration may be such that the inspection is performed on all the mailboxes regardless of the inspection result of each mailbox, and the inspection result is output for each mailbox.
[0101]
In the first and second embodiments, the in-vehicle computer having the engine control module has been described. However, the use of the present invention is not limited to the case where the engine control module is used. It is needless to say that the present invention can be widely applied to an in-vehicle computer that performs the following.
[0102]
Further, CAN is used not only for on-board computers but also for networks of medical equipment and industrial machines, but the present invention can be applied to communication modules mounted on these medical equipment and industrial machines. It is possible.
[0103]
Further, the present invention does not depend on the CAN protocol. Therefore, the present invention can be widely applied to a network communication apparatus for defining a message content by the ID information and constructing a network for determining a destination of the message by the ID information.
[0104]
(Supplementary Note 1) A method for inspecting a network communication device for transmitting and receiving, by CAN communication, a message including data stored in a data register and ID information defining a type of the data stored in an ID information register by CAN communication,
Inspection state transition process,
When a transition is made to the inspection state by the inspection state transition step, a predetermined pattern is written to the ID information register, and a read pattern obtained by reading the written pattern from the ID information register matches a write pattern. Inspection processing process to inspect whether or not
A method for inspecting a network communication device, comprising:
[0105]
(Supplementary note 2) The inspection method of the network communication device according to supplementary note 1, wherein the inspection state transition step transitions to the inspection state when a message instructing start of the inspection processing is received.
[0106]
(Supplementary Note 3) In the inspection processing step, a predetermined pattern is further written to the data register, and whether the read pattern read from the data register matches the write pattern is checked. 3. The method for testing a network communication device according to claim 1 or 2, wherein
[0107]
(Supplementary Note 4) The predetermined pattern includes a pattern in which values “0” are continuous, a pattern in which values “1” are continuous, a pattern in which values “01” are continuous, or a pattern in which values “10” are continuous. The inspection method for a network communication device according to any one of supplementary notes 1, 2, and 3, wherein
[0108]
(Supplementary note 5) The inspection of the network communication device according to any one of Supplementary notes 1 to 4, wherein the predetermined pattern includes a pattern of ID information used in performing actual CAN communication. Method.
[0109]
(Supplementary Note 6) In the inspection processing step, when it is determined that the read pattern and the write pattern of the specific pattern do not match, the inspection processing of the specific pattern is repeated a plurality of times, and the inspection processing is repeated a certain number of times or more. 6. The inspection method for a network communication device according to any one of supplementary notes 1 to 5, wherein it is determined that the register is abnormal when it is determined not to be performed.
[0110]
(Supplementary Note 7) The inspection process according to any one of Supplementary Notes 3 to 6, wherein the inspection process is performed using a pattern in which all bits forming the data register are to be inspected. An inspection method for a network communication device.
[0111]
(Supplementary Note 8) The inspection processing step is characterized in that the inspection processing is performed using a pattern in which bits used in actual CAN communication among all bits forming the data register are to be inspected. The inspection method of a network communication device according to any one of 3 to 7.
[0112]
(Supplementary Note 9) In the inspection processing step, when a plurality of pairs of the ID information register and the data register exist, all the ID information registers and all the data registers are to be inspected. The inspection method of a network communication device according to any one of the above.
[0113]
(Supplementary Note 10) In the inspection processing step, when a plurality of pairs of the ID information register and the data register exist, the pair of the ID information register and the data register used in the actual CAN communication is set as an inspection target. The inspection method for a network communication device according to any one of supplementary notes 3 to 8, wherein
[0114]
(Supplementary Note 11) When it is determined in the inspection processing step that there is at least one normal pair of the ID information register and data register pair, the normal ID information register and data register pair is used. The inspection method for a network communication device according to claim 9 or 10, further comprising an inspection result transmitting step of transmitting an inspection result of the inspection processing step by CAN communication.
[0115]
(Supplementary Note 12) In the inspection processing step, a message including a plurality of patterns for performing the inspection processing is sequentially received by actual CAN communication, and the inspection processing is performed using each of the received patterns. 12. The method for testing a network communication device according to any one of supplementary notes 1 to 11, wherein
[0116]
【The invention's effect】
As described above, according to the first aspect of the present invention, the network communication device writes a predetermined pattern in the ID information register, reads the written pattern, and compares the written pattern with the read pattern. By comparing and checking whether or not the write pattern and the read pattern match, it is configured to perform the check of the bit fixation, so that a network communication device that can efficiently execute the check of the bit fixation is obtained. This has the effect.
[0117]
According to the invention of claim 2, when the network communication device receives the message instructing the start of the inspection process, the network communication device shifts to the inspection state and starts the inspection of the ID information register for bit fixation. There is an effect that a network communication device that can efficiently execute the inspection of the bit fixation and can start the inspection of the bit fixation through the CAN communication is obtained.
[0118]
According to the third aspect of the present invention, the network communication apparatus checks whether or not the data register has a bit stuck in addition to the ID information register, so that the bit stuck between the ID information register and the data register is efficiently executed. There is an effect that a possible network communication device is obtained.
[0119]
Further, according to the invention of claim 4, the network communication device is configured such that the pattern in which the value "0" is continuous, the pattern in which the value "1" is continuous, the pattern in which the value "01" is continuous, or the value "10" is continuous Since the check of the bit fixation of the ID register and the data register is performed by using the pattern, it is possible to reduce the number of processing steps required for the check and obtain a network communication device capable of efficiently executing the check of the bit fixation.
[0120]
According to the fifth aspect of the present invention, the network communication device performs the check of the bit fixation of the ID register and the data register by using the pattern of the ID information used in performing the actual CAN communication. It is possible to obtain a network communication device that can efficiently perform the inspection of the sticking and that operates reliably with the ID information used for the actual CAN communication.
[0121]
Further, according to the invention of claim 6, the network communication device repeats the inspection process for the specific pattern when the read pattern and the write pattern do not match, and when the read pattern and the write pattern do not match continuously more than a certain number of times. Since it is determined that the register is abnormal, it is possible to obtain a network communication device that can efficiently execute the check for bit sticking and prevent erroneous determination.
[0122]
According to the seventh aspect of the present invention, the network communication device detects the stuck bits using the pattern in which the writing is performed for all the bits forming the data register. There is an effect that a network communication device capable of efficiently performing the inspection of the adhesion can be obtained.
[0123]
Further, according to the invention of claim 8, the network communication device performs bit fixation using a pattern in which writing is performed on bits actually used in CAN communication among a plurality of bits forming data bits. Is performed, it is possible to obtain an effect that a network communication apparatus with further reduced processing in the inspection of bit fixation can be obtained.
[0124]
According to the ninth aspect of the present invention, when there are a plurality of pairs of ID information registers and data registers, the network communication apparatus performs a check for bit sticking on all ID registers and data registers. This makes it possible to obtain a network communication device capable of efficiently executing the bit stuck inspection for the register (1).
[0125]
Further, according to the tenth aspect of the present invention, when a plurality of pairs of ID information registers and data registers exist, the network communication apparatus sets bits for the ID information registers and data registers actually used in CAN communication. Since the fixation check is performed, it is possible to obtain a network communication apparatus that can check the bit fixation of a register to be used, reduce the processing required for the check, and efficiently execute the check.
[0126]
According to the invention of claim 11, the network communication device has a plurality of ID information registers and data registers, and when at least one pair of a normal ID register and a data register exists, the normal ID Since the check result of the bit fixation is transmitted by the CAN communication using the register and the data register, the effect that the check of the bit fixation is efficiently executed and the network communication device capable of transmitting the check result by the CAN communication is obtained. Play.
[0127]
According to the twelfth aspect of the present invention, the network communication device receives the bit fixation inspection pattern by CAN communication and checks the bit fixation by the received pattern. There is an effect that a network communication device capable of executing the inspection of the above is obtained.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram illustrating a schematic configuration of a vehicle-mounted computer according to an embodiment;
FIG. 2 is a flowchart illustrating an operation process of a register check in a communication module.
FIG. 3 is an explanatory diagram illustrating the inside of a message storage unit.
FIG. 4 is a flowchart illustrating a processing operation of a communication module that outputs an inspection result via a CAN.
FIG. 5 is a flowchart illustrating a processing operation of a communication module provided with an erroneous determination prevention function.
FIG. 6 is an explanatory diagram illustrating an in-vehicle computer and an inspection device according to a second embodiment;
FIG. 7 is a flowchart illustrating an inspection method for an in-vehicle computer according to the second embodiment;
FIG. 8 is an explanatory diagram illustrating a CAN network.
FIG. 9 is an explanatory diagram illustrating a mailbox in a conventional CAN communication module.
[Explanation of symbols]
1,41 In-vehicle computer
2 Input / output processing unit
3 Engine control module
4,42 Communication module
5 CAN
6 Inspection equipment
11 Operation switching unit
12 Communication processing unit
13,43 Inspection processing unit
14,44,54 Inspection procedure storage
15,45 Inspection procedure data
16,56 message storage
16a Inspection range
17,52 Network connection unit
21-24, 31, 32, 61, 62 Mailbox
51 Inspection device
53 Inspection execution unit

Claims (12)

A network communication device for transmitting and receiving, by CAN communication, a message including ID stored in a data register and ID information defining a type of the data stored in an ID information register,
Inspection state transition means for transitioning to an inspection state;
When a transition is made to the inspection state by the inspection state transition means, a predetermined pattern is written to the ID information register, and whether or not a read pattern obtained by reading the written pattern from the ID information register matches a write pattern is determined. A network communication device comprising: an inspection processing unit for performing an inspection. 2. The network communication apparatus according to claim 1, wherein the inspection state transition unit transitions to the inspection state when receiving a message instructing start of the inspection processing. The inspection processing means writes a predetermined pattern into the data register, and inspects whether a read pattern obtained by reading the written pattern from the data register matches a write pattern. The network communication device according to claim 1. The predetermined pattern includes a pattern having a continuous value “0”, a pattern having a continuous value “1”, a pattern having a continuous value “01”, or a pattern having a continuous value “10”. Item 4. The network communication device according to item 1, 2, or 3. The network communication device according to any one of claims 1 to 4, wherein the predetermined pattern includes a pattern of ID information used when actual CAN communication is performed. The inspection processing means, when it is determined that the read pattern and the write pattern for the specific pattern do not match, repeats the inspection process for the specific pattern a plurality of times, and determines that the match does not match continuously for a certain number of times The network communication device according to claim 1, wherein it is determined that the register is abnormal when the error occurs. The network communication apparatus according to claim 3, wherein the inspection processing unit performs the inspection processing using a pattern in which all bits forming the data register are inspected. . 8. The inspection processing unit according to claim 3, wherein the inspection processing unit performs the inspection processing using a pattern in which bits used in actual CAN communication among all bits forming the data register are inspected. The network communication device according to any one of the above. 9. The inspection processing unit according to claim 3, wherein when there are a plurality of pairs of the ID information register and the data register, all the ID information registers and all the data registers are to be inspected. A network communication device according to one. 2. The method according to claim 1, wherein when there are a plurality of pairs of the ID information register and the data register, the inspection processing unit sets a pair of the ID information register and the data register used in the actual CAN communication as an inspection target. The network communication device according to any one of items 3 to 8. When the inspection processing means determines that there is at least one normal pair of the pair of the ID information register and the data register, the CAN communication using the pair of the normal ID information register and the data register is performed. 11. The network communication device according to claim 9, further comprising an inspection result transmitting unit that transmits an inspection result by the inspection processing unit. 2. The inspection processing device according to claim 1, wherein the inspection processing unit sequentially receives a message including a plurality of patterns for performing the inspection processing through actual CAN communication, and performs the inspection processing using the received patterns. 12. The network communication device according to any one of items 11 to 11.

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