JPH03124141A - On-vehicle communication equipment - Google Patents

Abstract

PURPOSE:To eliminate inconvenience of a controller due to disabled communication and to restore the operation to usual control automatically by receiving a sent consecutive command by the controller so as to allow the controller side to detect the disabled communication in a communication equipment making communication between the controller and a device diagnosing the controller. CONSTITUTION:A master station 9 constitutes an off-board diagnostic device diagnosing a control section of a vehicle comprising plural controllers 1, 3 in the on-vehicle communication equipment and a desired controller among the plural controllers is selected and a control command making a prescribed control operation to the selected controller is sent and an execution command is sent to execute the control operation by the control command. Moreover, a consecutive command relating to the consecution of the control operation by the execution command is sent and the time when the execution command or the consecutive command is received is counted and when the count time exceeds a predetermined prescribed time, the control operation by the execution command is terminated.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a control device such as a vehicle engine control unit, and a device such as a master station for diagnosing this control device. The present invention relates to a vehicle communication device that performs communication with a vehicle.

(Prior Art) In recent years, with the advancement of semiconductor technology, the electronic control of various parts of automobiles has progressed rapidly, and many microprocessors are installed in electronic control units (ECUs) such as engine control units.
is used as.

Although such highly electronically controlled systems realize vehicles that can provide high performance and comfortable driving, they also complicate failure diagnosis. This process involves electronically processing a large number of input signals in a complex manner, making it difficult to grasp the causal relationship between the phenomena that occur and their causes, and requiring advanced knowledge to analyze these phenomena. This is because intermittent interruptions in the signal are easily affected by external noise.

For this reason, many electronic control units are equipped with a self-diagnosis function, but since this diagnosis is an on-board diagnosis, processing capacity is limited, and an off-board diagnosis that allows more advanced failure diagnosis and analysis is required. A master station that constitutes an off-board diagnostic device is being developed.

When diagnosing each electronic control unit of a vehicle using such a master station, the master station selects the desired electronic control unit to be diagnosed from among multiple electronic control units, and performs diagnostic tests on the selected electronic control unit. Data communication is performed by transmitting a control command and receiving reply data from the electronic control unit in response to the control command.

In such data communication, the master station first initializes the communication line with each electronic control unit, and waits to receive a system selection command to select a desired electronic control unit from among multiple electronic control units. An initialization command is sent to each electronic control unit to set each electronic i-control unit to the state. By sending this initialization command, the communication line is initialized, and
When each electronic control unit is set to a standby state for receiving a system selection command, the master station transmits the system selection command, selects only the desired electronic control unit, and transfers data to and from the selected electronic control unit. Establish a link.

When the data link between the master station and the selected electronic control unit is established, the master station sends a control command, such as a parameter set command, to the selected electronic control unit to cause the selected electronic control unit to perform a desired control operation. , following the control command, two information bytes related to the control command are successively transmitted at a predetermined interval, so that, for example, the first information byte sets the item to be controlled, and the second information byte sets the item to be controlled. Then, the control tllllff1 etc. are set. Then, an execution command is sent to monitor the response performance of the vehicle, specifically the engine, etc. in response to the set state, and diagnosis is performed based on this. Furthermore, the diagnosis is terminated by sending a termination command.

(Problems to be Solved by the Invention) As mentioned above, in an electronic control unit in which a data link is established with a master station,
The control state of the electronic control unit is changed and internal data is output according to the control command and information byte sent from the master station, and these control operations continue until the end command is received from the master station. It is done.

However, data communication between the master station and the electronic control unit is carried out via signal lines, connectors, etc. Therefore, for example, after the control operation of the electronic control unit is changed by a control command from the master station, the master station Inconveniences may occur if the connector of the signal line connecting the station and the electronic control unit is disconnected.

In other words, since the electronic control unit does not have a means to detect the connection state of the connector, when the connector is removed as described above, it cannot detect this removal and the connector is removed. The control operation immediately before the start is continued. In addition, in order to cancel this control operation, it is necessary to reconnect the connector and send a termination command from the master station, or to perform a hardware reset using a power switch such as an ignition switch. It had become complicated.

Furthermore, since the control action when the connector is disconnected is set for failure diagnosis and analysis, it is not necessarily necessary for normal driving, and this control state may not be maintained for a long period of time. Leaving things unattended is not a good idea, and improvements are desired.

The present invention has been made in view of the above circumstances, and its purpose is to prevent problems such as disconnection of connectors during failure diagnosis of control devices such as electronic control units using off-board diagnostic equipment such as master stations. To provide a vehicular communication device capable of detecting the disconnection state, terminating diagnosis, and maintaining normal control operation even when communication from a master station is lost.

[Structure of the Invention] (Means for Solving the Problem) In order to achieve the above object, the vehicle communication device of the present invention has the following features:
A desired control device is selected from a plurality of control devices, a control command is sent to the selected control device to perform a predetermined control operation, and an execution command is sent when the control device is caused to perform a control operation based on the control command. A communication device for a vehicle that transmits a continuation command that transmits a continuation command related to continuation of the m control operation based on the execution command, and a continuation command transmission means that measures the time from the time when the execution command or the continuation command is received, The apparatus further includes a termination means for terminating the control operation based on the execution command when the measured time exceeds a predetermined time set in advance.

(Function) In the vehicle communication device of the present invention, if a continuation command is not received within a predetermined time after receiving an execution command or a continuation command, a termination command is transmitted, and the termination command is set by a control command and executed by an execution command. Terminates the control operation.

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

FIG. 2 is a block diagram showing the system configuration of a vehicle communication device according to an embodiment of the present invention.

In the embodiment shown in the figure, for example, an engine control unit, an A/T! II
A plurality of control devices 1, 3 . ... is the data transmission line Tx,
They are interconnected by a signal line 5 consisting of a data reception line Rx and a clock line CLK, and a master station 9 is connected to these control devices via a signal $115 and a connector 7.

This master station 9 constitutes an off-board diagnostic device for diagnosing the control section of the vehicle, which is composed of, for example, a plurality of control devices 1 and 3, and displays a numeric keypad 11 for inputting various information, diagnostic information, etc. It has a display 13, a power switch 15, an end key 17 for ending the diagnostic operation, and the like.

In addition, in FIG. 2, the first and second control devices 1.3 and 2.
Although only one control device is shown, the present invention is not limited to this, and various other control devices may be provided.

The master station 9 has a plurality of control devices 1 and 3.
Select the desired one of the
Send various commands to this υJtllll device to diagnose the device, and control response information to these commands.
The response information is obtained from the it+ device and the control device is diagnosed based on this response information.

In this way, the master station 9 sends various commands to each control device in order to diagnose each control device, and in data communication between the two to obtain response information, the transmission line code type, so-called data modulation method, is used. is N
The RZ method is used, and LJART is used as the communication circuit. The data format used is one in which a start bit is added at the beginning, then 8-bit data is inserted, and a stop bit is added at the end, as shown in FIG. This allows the commands used for each communication,
It constitutes the information byte. Furthermore, the transmission control method between the master station 9 and each control device employs a polling selection method in which the master station 9 is the master station and each control Vill is a slave station.

Moreover, the master station 9 uses the above-mentioned modulation method,
Multiple based on transmission control method etc. Selects a desired control device from among the II control devices 1.3, sends various commands and information bytes for performing various diagnoses to the selected control device, and controls the echo pack signal that is a response signal to the selected control device. The selection and diagnosis control procedure is divided into four phases O to 3 as shown in the table below.

Next, the operation will be explained with reference to a table showing this phase, a timing chart shown in FIG. 4, and an operation suit for changing the engine speed shown in FIG. 5. In addition, each phase 0 to 3 defined in the above table showing the phases is the fourth phase.
This is shown on the horizontal time axis of the timing chart in the figure, and the control procedure by the master station 9 is sequentially executed according to these phases.

First, each control device 1.
3, connect the master station 9 and each control device M1, 3 using the connector 7 as described at the beginning of the item "One person (operation)" in FIG. Turn on the power and put it into operation.

When the power is turned on in this manner and the master station 9 enters the operating state, the master station 9 enters the state of phase 0, and the display 13 of the master station 9 shows the fifth
As shown by 41 in the figure, all control devices currently connected to the master station 9 [1. "First control device", "2, Second control wJ device", etc. are displayed.

In addition, in order to initialize the line and terminate the link in this phase 0, the master station 9 continuously issues the initialization command INIT twice at a predetermined interval as shown at time 1 and t2 in FIG. and sends it to all control devices.

When each control device 1.3 receives this initialization command,
Each control deviceffl! 1.3 is in a waiting state for receiving a system selection command, which will be described later, and the signal line 5, especially the data transmission line TX of the signal line 5, becomes vacant, and the line consisting of the signal line 5 is initialized (phase O).

Furthermore, if there is a control device that is establishing a data link at this time, this control device terminates communication and similarly enters a state of waiting to receive a system selection command.

Note that the initialization command INIT is a command that targets all control devices, but if echobacks, which are response signals, are returned from multiple control devices, there is a risk that the echoback data may not be read by the master station 9. , only when there is a control device that is establishing a data link, only this control device that is establishing a data link returns an echo back.

As described above, when the line consisting of the signal I5 is initialized and each control device 1.3 enters the state of waiting to receive a system selection command, the master station 9 enters the phase 1 state, but in this state, multiple operators Control unit @1.
In order to select a desired control device to be diagnosed out of 3, use the numeric keypad 11 of the master station 9 to select the number of the desired control device, and perform one-to-one communication with the control device with the selected number. Then, the corresponding system selection command 5C(i) is transmitted as shown at time t3 in FIG. The figure shows a case where the first control device M1 is selected, and a system selection command 5C(i) is transmitted.

The system selection command SC(i'') sent from the master station 9 is the selected first control tg+.
Once received by the device 1, this first control device 1 sends to the master station 9 an echo back signal 5O(i) which is an inversion of the system selection command 5C(i) in order to inform the master station 9 of the reception. Fourth
It is returned as shown at time t4 in the figure.

The master station 9 receives this inverted echo back signal 5.
C(i) is received, and this inverted echoback signal SC(+
) is from the selected first control device 1, a data link is established between the master station 9 and this first control device 1 (phase 1). Note that other control devices such as the second control device fi3 that are not selected at this time return to the state with the initialization command,
Until the next initialization command INIT is received twice,
Retain state. Therefore, only the selected first control device 1 that is establishing a data link can communicate with the master station 9.

Once the first control device 1 has been selected in this way and the data link between this first control device 1 and the master station 9 has been established, the master station 9 enters phase 2 and enters the diagnostic mode. You will have to set it up, but
In this state, a list of diagnostic functions that can be executed by the master station 9 is displayed on the display 13 of the master station 9, as shown at 42 in FIG.

In order to set the diagnostic mode in this phase 2,
The master station 9 sends a mode setting command, and there are various commands in this mode setting command, and they can be roughly divided into commands that are defined independently, and control commands that have an information byte following the command, such as a parameter set command PS. There is a suburban command.

The parameter set command PS is a command that instructs to set, for example, the state of the engine to a specific state, and following this command, for example, two information bytes are successively transmitted at a predetermined interval. ing. For example, if you want to set the engine's idling speed to 1500 rpm, use this parameter command PS
Subsequently, a first information byte indicating "engine idling speed" and a second information byte indicating "N 500 revolutions" may be transmitted.

Therefore, the operator now selects the case where the engine fitting rotation speed is set to 1500 rotations as described above as the diagnosis mode, and the operator selects the case where the engine fitting rotation speed is set to 1500 rotations.
Select the diagnostic mode for the parameter set command from the display 13 using the numeric keypad 11, and
As the information byte for this parameter set command PS, enter "number of revolutions" and "r1500 revolutions" on the numeric keypad.
When specified by , the display 13 of the master station 9 shows the "number of revolutions" and N as shown at 43 in FIG.
500 revolutions" is displayed, and then a parameter set command PS is transmitted from the master station 9 to the first control device 1 as shown at time [5 in FIG. 4.

When the first control device 1 receives the parameter set command PS from the master station 9, the first control device 1 returns an echo back signal PS, which is an inverted version of the parameter set command PS, to the master station 9 to confirm the reception (Fig. At time t6), the information byte is held.

When the master station 9 confirms that the inverted echo back signal from the first control device 1 is the inverted data of the previously transmitted parameter set command PS, the master station 9 transmits [first information byte 1 indicating rotation speed J] te+++ is transmitted to the first control device 1 as shown at time t7 in FIG.

The first control device 1 reads this first information byte IteIl.
When the first information byte is received, an echo back signal of the same data as this first information byte, that is, an echo back signal that is not inverted, is sent back to the master station 9 (time t8 in FIG. 4).
) When the master station 9 verifies that the echoback signal from the first control device 1 is the same as the first information byte sent earlier, it sends a second information byte I ten indicating "1500 revolutions". It is transmitted to the first control device 1 (time [9 in FIG. 4).

When the first control device 1 receives this second information byte Item, it returns an echo back signal of the same data as this second information byte Htem to the master station 9 (time t10 in FIG. 4).

The master station 9 receives the second information byte previously transmitted by the echo-back signal from the first control device 1.
Confirm that it is the same as em, and finish setting the parameter set command PS. Information byte 1 tent can take on any value within the specified byte to represent many items, control values, etc.

When the master station 9 finishes setting the diagnosis mode using the parameter set command PS as described above, it enters phase 3 and sends the diagnosis execution command EX to the first control terminal 1 as shown at time t11 in FIG. do.

When the first control device 1 receives the diagnosis execution command EX from the master station 9, it selects the control values of the control items previously set by the parameter set command PS, that is, in the case described above, the "engine speed" and r150.
Execution is performed for a control value such as "0 rotation", and diagnostic data of the engine rotation speed data at the time of this execution is repeatedly sent back from the first control device 1 to the master station 9.

After transmitting the diagnosis execution command EX, the master station 9 transmits a diagnosis continuation command CNT before a certain period of time tc has elapsed. This diagnostic continuation command CNT is repeatedly transmitted from the master station 9 at intervals shorter than a certain time tc until the end key 17 is operated and the diagnostic end command STP is transmitted.

On the other hand, while the first control device 1 receives the diagnostic continuation command CNT from the master station 9 within the predetermined time tc, it transmits the specified control value and diagnostic data. Further, if the diagnosis continuation command CNT is not received within the predetermined time tc after receiving the diagnosis execution command EX or the diagnosis continuation command CNT, the control state change and the transmission of the diagnosis data are finished, and the control command is set. The state returns to the state where it was not performed, that is, the state of phase 2.

Note that the diagnostic data returned in this way is based on the fourth cause at time t12. ~． As shown at t13, it is returned as one frame consisting of a 1-byte header, 1-byte data length, and 254 bytes or less of data.

The diagnostic data returned from the first control device 1 is received by the master station 9, and the received diagnostic data is displayed on the display 13 of the master station 9 as shown in FIG. 5, so that the control values are adjusted as specified. It is confirmed that the engine relationship is normal. In addition,
In the example shown in FIG. 5, the engine speed in the diagnostic data displayed on the display 13 of the master station 9 is 15.
02 rotations, and it can be seen that it is almost normal.

When the diagnostic data is obtained as described above, the operator presses the end key 17 of the master station 9. End key 1
7 is pressed, the master station 9 sends a diagnosis end command STP to the first control device 1 (time t14 in FIG. 4). The first control device 1 sends a diagnosis end command S
When TP is received, the control command settings that have been set so far are cleared, and an echo back signal STP, which is the inverted data of the received diagnostic end command STP, is sent back to the master station 9 (at time t1 in FIG. 4).
5). The master station 9 terminates the inverted echoback communication from the first control unit W11.

In this embodiment, the diagnosis continuation command CNT is sent in phase 3, but the present invention is not limited to this. In response to this, the diagnosis continuation command CNT may be transmitted in Phase 2 and Phase 3. In addition, the diagnosis continuation command CN
If T is not received, the data link may be terminated after returning to the phase 2 state.

[Effects of the Invention] As explained above, according to the present invention, the control device can detect a communication interruption by receiving the transmitted continuation command at the control device. It is possible to eliminate the inconvenience of the control device and automatically return to normal control operation.

[Brief explanation of drawings]

Figure 1 is a complaint correspondence diagram, Figure 2 is a block diagram showing the system configuration of a vehicle communication device according to an embodiment of the present invention, and Figure 3 is a data format used in the vehicle communication device shown in Figure 2. FIG. 4 is a timing chart showing the operation of the vehicle communication device in FIG. 2, FIG. 5 is a table showing the operation and effect of the vehicle communication device in FIG. 2, and FIG. 6 is a diagnosis continuation command. FIG. 1...First control device 3...Second control device 5...Signal line 9...Master station 11...Numeric keypad 13...Display 17...End key

Claims (1)

[Claims] A desired control device is selected from a plurality of control devices, a control command is sent to the selected control device to perform a predetermined control operation, and the control operation based on the control command is transmitted. A communication device for a vehicle that transmits an execution command when executing the command, comprising a continuation command transmitting means for transmitting a continuation command related to continuation of a control operation based on the execution command, and a time elapsed from the time when the execution command or the continuation command is received. A communication device for a vehicle, comprising: a termination unit that measures the time and terminates the control operation based on the execution command when the measured time exceeds a predetermined time set in advance.