JP3247209B2 - Multiplex transmission equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a plurality of communication nodes connected via a multiplex line, and the multiplexing is performed from a communication node connected to an input switch to another communication node connected to an electrical component. The present invention relates to a multiplex transmission device configured to output an operation command signal via a line.

[0002]

2. Description of the Related Art Conventionally, as shown in, for example, Japanese Patent Application Laid-Open No. Hei 4-207837, by connecting a plurality of communication nodes mounted on a vehicle or the like in a network by a common multiplex line, each electric component and its In a multiplex transmission system configured to simplify the structure of a harness that connects an input switch to operate a switch, by transmitting data for failure determination from a specific communication node to another communication node when the engine is started, It is performed to determine the failure of each communication node.

That is, a fail transmission request frame is transmitted from a communication node operating at the time of engine start to another communication node, and a reception state of a fail frame transmitted from each communication node in response to the fail transmission request frame is received. , It is determined whether or not each communication node is connected in an appropriate state on the multiplex transmission path.

[0004]

As described above, a conventional failure transmission request frame for failure determination for performing failure determination and a failure frame corresponding to the failure transmission request frame are transmitted and received to perform failure determination. The multiplex transmission device has a problem in that the traffic on the multiplex transmission line increases when the engine is started, and a response delay may occur.

At the time of starting the engine, as shown in, for example, JP-A-1-143533, event data indicating the state of each communication node is transmitted through a multiplex transmission line, so that start-up delay due to abnormal power supply can be prevented. 2. Description of the Related Art A malfunction of a system due to a startup delay due to a variation in startup time of a power supply circuit has been prevented. Therefore, when the engine is started, if a failure transmission request frame for failure determination and a failure frame are transmitted and received in addition to the event data indicating the state of each communication node, traffic on the multiplex transmission path However, there is a problem that a response delay occurs due to an increase in the distance.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is intended to prevent an increase in traffic on a multiplex transmission line at the time of engine start and to prevent communication between communication nodes before a vehicle travels. It is an object of the present invention to provide a multiplex transmission device capable of appropriately detecting an abnormality.

[0007]

The invention according to claim 1 is
Multiple transmission having a plurality of communication nodes connected via a multiplex line and configured to transmit operation data indicating a state of the own communication node to another communication node when an ignition key switch is turned on. A determination means for determining whether or not the transmission of the operation data is completed after the ignition key switch is turned on by the device; and, when the determination means confirms that the transmission of the operation data is completed, each communication is performed. Transmission means for transmitting data for failure detection to detect communication abnormality between nodes.

According to a second aspect of the present invention, the determination means determines whether or not the traveling start condition of the vehicle is satisfied, thereby displaying the state of its own communication node after the ignition key switch is turned on. It is configured to determine whether data transmission has been completed.

According to a third aspect of the present invention, there is provided a non-multiplex line connecting each communication node, and transmission of operation data for displaying a state of the own communication node according to data transmitted through the non-multiplex line. Is determined by the determining means.

According to a fourth aspect of the present invention, at least two communication nodes are provided with transmission means for transmitting operation data for failure detection for detecting a communication abnormality between the communication nodes.

[0011]

According to the first aspect of the present invention, when the ignition key switch is turned on, the operation data indicating the state of the own communication node is transmitted to the other communication nodes, and then the operation data is transmitted. When the determination unit confirms that the communication has been completed, data for failure detection is output from the transmission unit to each communication node, and by determining the reception state, whether a communication abnormality has occurred between the communication nodes is determined. The detection of whether or not it is performed will be performed.

According to the second aspect of the present invention, when the ignition key switch is turned on, the determination means determines whether or not the vehicle start condition is satisfied, and the vehicle start condition is satisfied. When it is confirmed, the data for failure detection is output from the transmitting means to each communication node, and by determining the reception state, it is detected whether or not a communication abnormality has occurred between the communication nodes. Will be.

According to the third aspect of the present invention, it is determined by the determining means whether or not the traveling start condition of the vehicle is satisfied according to the data transmitted from the non-multiplex line, and the traveling start condition of the vehicle is satisfied. When it is confirmed that the failure has occurred, the data for failure detection is output from the transmission means to each communication node.

According to the fourth aspect of the present invention, when the determination means confirms that the transmission of the operation data has been completed after the ignition key switch is turned on,
At appropriate times, the transmission means of at least two communication nodes output failure detection data to each communication node, and by determining the reception state of these data signals, a communication abnormality occurs between the communication nodes. Detection is performed.

[0015]

FIG. 1 shows the overall configuration of a multiplex transmission apparatus according to the present invention. This multiplex transmission device has first to fourth communication nodes 1 to 4 mounted at a predetermined position on a vehicle or the like, and a multiplex line 5 composed of a twisted pair line that connects adjacent communication nodes 1 to 4 to each other. ing.

Each of the communication nodes 1 to 4 has a predetermined number of input switches 6 to 10 such as input switches and sensors.
Electrical components 11 to 14 such as a lamp and a motor are connected to each other. For example, to the first communication node 1, input means 6 comprising an inhibitor switch of an automatic transmission and input means 7 comprising an engine speed sensor are connected via non-multiplex lines 6a, 7a. Node 3
Input means 9 comprising a vehicle speed sensor is provided
b.

As shown in FIG. 2, the first communication node 1 has a microcomputer 15 and a multiplexing device connected to the microcomputer 15 via a signal line 5a for inputting and outputting a control signal composed of multiplexed signals. Module 1
6, the input means 6, 7 and the microcomputer 15
, An output interface 18 connecting the electrical component 11 and the microcomputer 15, and a power supply circuit 20 activated in response to an ON operation of an ignition key switch 19.

The microcomputer 15 of the first communication node 1 has an ignition key switch 19
After the N operation, determining means 21 for determining whether or not the traveling start condition of the vehicle is satisfied, and when the determining means 21 confirms that the traveling start condition of the vehicle is satisfied, each of the communication nodes 1 to 4 And a transmitting means 22 for outputting a signal frame, which will be described later, for detecting an abnormality of the signal.

After the determination means 21 detects that the ignition key switch 19 has been turned ON in response to the output signal of the power supply circuit 20, the determination means 21 controls the automatic transmission in accordance with the output signals of the input means 6 and 7. When it is confirmed that the shift lever is operated to a driving range such as the D range and the engine speed is equal to or higher than a preset reference speed, it is determined that the traveling start condition of the vehicle is satisfied. It is configured.

The transmitting means 22 transmits a signal frame 23 as shown in FIG. 3 to another communication in response to a command signal output from the determining means 21 when it is confirmed that the conditions for starting the vehicle have been satisfied. It is configured to output to nodes 2 to 4.

The signal frame 23 includes an ID code in which data (for example, 55H) indicating a failure determination signal is written, a D3 code in which failure determination data (AAH) is written, and a transmission source. A D2 code in which an address is written, a D1 code in which arbitrary data is written, data FFH indicating a return request mode, or data OOH indicating a non-return request mode
Is composed of the written D0 code. That is, there are two types of signal frames 23: a signal frame for transmission requesting return and a signal frame for return not requesting return.

When the ignition key switch 19 is turned on, the transmitting means 22 transmits a data signal indicating the state of the first communication node 1, that is, the operation state of the input means 6 and 7, to the multiplexing module 16 and the multiplexing module. It is configured to output to other communication nodes 2 to 4 via a line 5.

The power supply circuit 20 outputs a signal notifying that the ignition key switch 19 has been turned ON to the determination means 21 of the microcomputer 15, and in the sleep state of the first communication node 1,
When the ignition key switch 19 is turned on, a command signal for forcibly setting the microcomputer 15 and the multiplex module 16 to a wake-up state is output.

In addition, in the third communication node 3, it is confirmed by the determining means 21 that the running speed of the vehicle has become equal to or higher than the preset reference vehicle speed in accordance with the output signal of the input means 9 comprising the above-mentioned vehicle speed sensor. In this case, it is determined that the traveling start condition of the vehicle is satisfied, and the signal frame 2 for the failure detection is determined.
3 is configured in the same manner as the first communication node 1 except that the third communication node is configured to output 3 from the transmission unit 22.

On the other hand, in the second communication node 2 and the fourth communication node 4, the judgment means 21 for judging that the condition for starting the vehicle is satisfied is omitted, and the second communication node 2 and the fourth communication node 4 The function of the transmitting means 22 for outputting a signal frame for transmission requesting a return is omitted, and except for this point, the first and third communication nodes 1 and 3 are omitted.
It is configured similarly to.

The control operation of the first and third communication nodes 1 and 3 having the above configuration will be described with reference to the flowchart shown in FIG. When the above control operation starts, first, in step S
In 1, it is determined whether or not the traveling start condition of the vehicle is satisfied. For example, in the case of the first communication node 1, after the ignition key switch 19 is turned ON, the shift lever of the automatic transmission is operated to the travel range,
When the condition that the engine speed is equal to or higher than the preset reference vehicle speed is satisfied, it is determined that the traveling start condition of the vehicle is satisfied.

If YES is determined in step S1, a flag F indicating that the signal frame 23 for failure detection has already been output is set to 1 in step S2.
Is set. At the start of the control, the flag F is normally reset to 0. Therefore, after determining NO in step S2, data FFH indicating the return request mode is written in the DO code in step S3. The transmission means 22 outputs the transmission signal frame 23 to the other communication nodes 2 to 4.

If the determination in step S1 is NO and the determination means 21 of the first communication node 1 has not yet confirmed that the vehicle start condition has been satisfied, then in step S4 the third communication node It is determined whether or not the transmission signal frame 23 in which the data FFH indicating the return request mode is written in the DO code from the communication node 3 is output.

That is, if it is determined that the vehicle start condition is satisfied in the third communication node 3 prior to the first communication node 1, the signal frame 23 is output from the transmission means of the third communication node 3. Therefore, the result of the determination in step S4 is YES. In this case, in step S5, after setting the flag F to 1, a reply signal frame 23 in which the data OOH indicating the non-return request mode is written in the DO code is output.

Next, at step S7, it is determined whether or not the traveling end condition of the vehicle is satisfied. For example, by determining whether or not the ignition key switch 19 has been turned off, it is confirmed that the traveling end condition of the vehicle has been satisfied. Then, when YES is determined in step S7, the flag F is set to 0 in step S8.
And the control operation ends.

The control operation of the second and fourth communication nodes 2 and 4 will be described with reference to the flowchart shown in FIG. When this control operation starts, step S11
, It is determined whether or not the transmission signal frame 23 output from the first communication node 1 or the third communication node 3 has been received.

If "YES" is determined in the step S11, the data FFH indicating the return request mode written in the DO code of the signal frame 23 indicates the non-return request mode in the step S12. A reply signal frame 23 rewritten to the data OOH is output.

As described above, the ignition key switch 1
9 is turned on, a signal for detecting a communication abnormality of each of the communication nodes 1 to 4 by confirming that the traveling start condition of the vehicle is satisfied according to an output signal output from the input means 6 and 7. Since the frame 23 is configured to be output, it is possible to detect the presence or absence of the communication abnormality before the vehicle shifts to the running state while preventing the traffic on the multiplex line 5 from increasing when the engine is started.

That is, when the shift lever is operated to the travel range as described above and the engine speed is increased to the reference speed or more and the vehicle start condition is satisfied, each communication node is started when the engine is started. Since the transmission of the operation data signals indicating the states 1 to 4 has already been completed, the signal frame 23 for failure detection can be used without increasing the traffic on the multiplex line 5 connecting the communication nodes 1 to 4. Can be output.

When the traveling start condition is satisfied, the transmission signal frame 23 output from the first communication node 1 or the like is appropriately transmitted to each of the communication nodes 2 to 4 before the vehicle shifts to the traveling state. By judging whether or not the communication abnormality has been received, and by judging whether or not the reply signal frame 23 corresponding to the signal has been properly output from each of the communication nodes 2 to 4, the presence or absence of the communication abnormality can be accurately determined. Can be detected. As a result, when the vehicle travels, a part of the signal line 5a connecting the multiplex module 16 provided in each of the communication nodes 1 to 4 and the microcomputer 15 or an erroneous signal due to a failure of the multiplex module 16 itself. Can be reliably prevented from being transmitted and received.

In the above embodiment, the third node 3 also determines whether the vehicle start condition is satisfied by the third node 3 in parallel with the determination means 21 of the first communication node 1 determining whether the vehicle start condition is satisfied. It is configured to determine whether or not the condition has been satisfied, and to output the signal frame 23 for transmission when either one of the conditions for starting the driving has been satisfied. Therefore, the detection of the communication abnormality can be performed quickly and accurately. Can be done.

That is, when a failure occurs in one of the communication nodes 1 and 3 and the transmission of the transmission signal frame 23 becomes impossible, or when the determination of the traveling start condition in one of the communication nodes 1 and 3 is delayed for some reason. However, on the other hand, when it is confirmed that the traveling start condition of the vehicle is satisfied, the transmission signal frame 23 is output.
In response to this, it is possible to reliably detect a communication abnormality in each of the communication nodes 1 to 4 according to the transmission state of the reply signal frame 23 output.

In the above embodiment, the non-multiplex lines 6a, 7a, 9 provided separately from the signal line 5a connecting the microcomputer 15 and the multiplex module 16 are provided.
Since it is configured to determine whether or not the traveling start condition of the vehicle is satisfied according to the output signals of the input means 6 and 7 input through the signal line 5a, the signal line 5a, the multiplex module 15 and the multiplex line 5 Even when a failure occurs, it is possible to reliably detect whether the traveling start condition is satisfied. Therefore, it is possible to prevent a situation in which the transmission signal frame 23 is not output due to the failure of the signal line 5a or the like, and to always appropriately perform the failure determination.

In the above embodiment, the input means 6, 7,
9, the first communication node 1 and the third communication node 3 are configured to determine whether or not the traveling start condition of the vehicle is satisfied. The types and the number of communication nodes to be executed are not limited to those in the above embodiment, and various modifications are possible.
Further, by detecting the transmission state of the operation data output from each communication node when the engine is started, the end of the transmission of the operation data may be directly detected.

[0040]

As described above, according to the present invention, the state of each communication node is displayed when the engine is started by, for example, determining whether or not the driving start condition of the vehicle is satisfied after the ignition key switch is turned on. When it is confirmed that the transmission of operation data has been completed, data for detecting a communication abnormality between the communication nodes is output, thereby preventing an increase in traffic on multiple lines when the engine is started. Meanwhile, the presence or absence of the communication abnormality can be detected before the vehicle shifts to the running state.

Therefore, it is possible to accurately detect the presence or absence of the communication abnormality according to the data for failure detection while preventing the occurrence of a response delay due to the increase in traffic, thereby providing a communication node in each communication node. A part of the multiplex line connecting the multiplex module and the microcomputer, or the multiplex module itself has failed,
It is possible to reliably prevent a situation in which the vehicle shifts to the running state.

Also, according to the output signal of the input means which is input through a non-multiplex line provided separately from the multiplex line connecting the microcomputer of the communication node and the multiplex module, the state of each communication node is determined. When it is configured to determine whether or not the transmission of the operation data indicating is completed, even if a failure occurs in the multiplex line, it is possible to reliably detect the establishment of the traveling start condition and the like, and There is an advantage that the failure determination can always be properly performed.

Further, according to the configuration in which the determination means of the plurality of communication nodes determines whether or not the transmission of the operation data indicating the state of each communication node at the time of starting the engine is completed, the specific communication node If a failure occurs and the transmission of the data signal for failure determination becomes impossible, or if the determination in one communication node is delayed for some reason, the failure detection output from the other communication node is used. It is possible to accurately and quickly detect whether or not a communication abnormality has occurred in each communication node in accordance with the data.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the overall configuration of a multiplex transmission device according to the present invention.

FIG. 2 is a block diagram showing an internal structure of a communication node.

FIG. 3 is an explanatory diagram showing a configuration of a signal frame for failure determination.

FIG. 4 is a flowchart illustrating a control operation of a first communication node.

FIG. 5 is a flowchart illustrating a control operation of a third communication node.

[Explanation of symbols]

 1-4 communication node 5 multiplex line 5a signal line 19 ignition key switch 21 determination means 22 transmission means

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-62-111543 (JP, A) JP-A-1-143533 (JP, A) JP-A-4-207837 (JP, A) JP-A-5-111 153195 (JP, A) JP-A-5-175971 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04J 3/00-3/26 H04L 5/22-5/26 H04L 12/28-12/46 H03J 9/00-9/06 H04Q 9/00-9/16 JICST file (JOIS)

Claims (4)

(57) [Claims] 1. A communication system comprising: a plurality of communication nodes connected via a multiplex line; and, when an ignition key switch is turned on, operation data indicating a state of the communication node is transmitted to another communication node. In the configured multiplex transmission device, after ON operation of the ignition key switch, a determination unit for determining whether or not the transmission of the operation data has been completed, and the determination unit has confirmed that the transmission of the operation data has been completed. A transmission unit for transmitting data for failure detection in order to detect a communication abnormality between the communication nodes. 2. The transmission of operation data for displaying the state of its own communication node is completed after the ignition key switch is turned on by determining whether or not the traveling start condition of the vehicle is satisfied by the determination means. 2. The multiplex transmission apparatus according to claim 1, wherein the multiplex transmission apparatus is configured to determine whether or not the multiplex transmission is performed. 3. A non-multiplexed line connecting each communication node, and whether or not transmission of operation data indicating the state of the own communication node is completed according to data transmitted through the non-multiplexed line. 2. The multiplex transmission apparatus according to claim 1, wherein the judgment is made by a judgment means. 4. The multiplex transmission apparatus according to claim 1, wherein at least two communication nodes are provided with transmission means for transmitting failure detection data for detecting a communication abnormality between the communication nodes. .