JP6769757B2 - Failure diagnostic device - Google Patents

Description

The present invention relates to a vehicle failure diagnosis device, and specifically relates to a technical field of a failure diagnosis device that causes a presenting unit to present vehicle information based on data indicating vehicle information received from an in-vehicle control unit.

In Patent Document 1 below, there is known a failure diagnosis device having a display means, communicating with an electronic control device of the vehicle to perform a failure diagnosis of the vehicle, and displaying the measurement results of measurement parameters on the display means in a comparable manner. ..

The conventional failure diagnosis device receives vehicle information (for example, information such as engine speed and accelerator opening) from a plurality of in-vehicle control units (hereinafter referred to as "vehicle data"), and each received vehicle data. Some have a function of presenting the image on a presentation unit such as a display. The diagnostician can monitor various vehicle information presented by the function and use it as a reference for failure diagnosis.
At this time, the failure diagnosis device repeatedly makes a transmission request to each in-vehicle control unit to continuously receive various vehicle data. However, according to the communication standard, each in-vehicle control unit has an interval of vehicle data transmission requests. Timeout time is set for. That is, when the vehicle-mounted control unit transmits vehicle data in response to the transmission request, if the timeout time elapses before the next transmission request is made from the transmission request, the vehicle-mounted control unit determines that the communication is interrupted and causes an error in the failure diagnosis device. Send information.
When vehicle data is received from only one in-vehicle control unit, the failure diagnosis device can receive the next vehicle data relatively quickly after receiving the vehicle data, so basically a timeout does not occur. Absent.

Japanese Unexamined Patent Publication No. 2011-99773

However, when attempting to sequentially receive vehicle data from a plurality of vehicle-mounted control units, the failure diagnosis device requests and receives vehicle data for one vehicle-mounted control unit, and then obtains vehicle data for another vehicle-mounted control unit. The transmission request and reception of vehicle data cannot be made for the one in-vehicle control unit until the transmission request and reception of the above are completed. Therefore, if there is an in-vehicle control unit that is slow to process or an in-vehicle control unit that has a large number of vehicle data to be transmitted, the interval between transmission requests made for each in-vehicle control unit becomes long, and an in-vehicle control unit that causes a timeout error Occurs. That is, the failure diagnosis device cannot acquire the vehicle information, and the vehicle information presentation process ends abnormally.

If the vehicle information presentation process is abnormally terminated, the diagnostician is forced to interrupt the diagnostic work and must restart the diagnostic work from the beginning.
In recent years, vehicles have become more sophisticated, and the number of vehicle information items to be monitored at the time of diagnosis is also increasing. Therefore, it is easy for abnormal termination of vehicle information presentation processing due to the above communication error to occur. It has become.

Therefore, an object of the present invention is to prevent abnormal termination of vehicle information presentation processing caused by a communication timeout error of the vehicle-mounted control unit.

The failure diagnosis device according to the present invention is a failure diagnosis device that causes a presenting unit to present the vehicle information based on data indicating vehicle information received from a plurality of vehicle- mounted control units, and is set for each of the vehicle-mounted control units. In the test process of receiving the data from each of the in-vehicle control units regardless of the maximum allowable communication interval, a plurality of the in-vehicle control units for which the vehicle information is acquired are sequentially requested to be sequentially requested for each of the in-vehicle control units. Based on the receiving unit that receives data, the measuring unit that measures the receiving interval of the data by the receiving unit for each in-vehicle control unit, the maximum allowable communication interval, and the receiving interval measured by the measuring unit. For each in-vehicle control unit, a calculation unit that calculates a margin value, which is an index value indicating a margin value of the reception interval with respect to the maximum allowable communication interval, and information representing the margin value are presented based on the margin value calculated by the calculation unit. It is provided with a presentation control unit to be presented to the unit.
As a result, for the in-vehicle control unit for which the vehicle information is acquired, the presentation unit is presented with the margin of the reception interval with respect to the maximum allowable communication interval.

In the above-mentioned failure diagnosis device, each of the in-vehicle control units can acquire information by a plurality of items as the vehicle information, and the receiving unit can acquire the information of each of the in-vehicle control units as the data. Of the vehicle information, data representing the vehicle information of the item selected for each vehicle-mounted control unit is requested and received, and the calculation unit calculates the margin value calculated for the vehicle-mounted control unit. The item selection number suggestion value suggesting the number of selections of the item allowed to secure the margin of the vehicle-mounted control unit is calculated, and the presentation control unit uses the item selection number suggestion value calculated by the calculation unit. It is conceivable to have the presentation unit present the numerical information to be represented.
This makes it possible to suggest the number of item selections allowed to the diagnostician in response to the case where items need to be reselected in order to prevent abnormal termination of the vehicle information presentation process.

In the above-mentioned failure diagnosis device, each of the in-vehicle control units can acquire information by a plurality of items as the vehicle information, and the receiving unit can acquire the information of each of the in-vehicle control units as the data. Of the vehicle information, data representing the vehicle information of the item selected for each vehicle-mounted control unit is requested and received, and the item is selected based on the margin value calculated by the calculation unit. It is conceivable to have a part.
As a result, the item is automatically reselected by the failure diagnosis device based on the margin value in response to the case where the item needs to be reselected in order to prevent the abnormal termination of the vehicle information presentation process.

The above-mentioned failure diagnosis device includes a determination unit for determining a diagnosis purpose using the failure diagnosis device, and the selection unit may select the item based on the diagnosis purpose determined by the determination unit. Conceivable.
This makes it possible to make it difficult for items required for diagnostic purposes to be deselected in response to the case where items need to be reselected in order to prevent abnormal termination of the vehicle information presentation process. ..

In the above-mentioned failure diagnosis device, it is conceivable that the calculation unit calculates the margin value for each of the vehicle-mounted control units by using the maximum reception interval among the reception intervals measured by the measurement unit.
As a result, the margin value is calculated based on the reception interval calculated under the strictest communication conditions.

According to the present invention, it is possible to prevent abnormal termination of vehicle information presentation processing due to a communication timeout error of the vehicle-mounted control unit.

It is a block diagram which shows the state which the failure diagnosis apparatus as 1st Embodiment is connected to a vehicle control system. It is a functional block diagram of the CPU in 1st Embodiment. It is explanatory drawing of the reception interval of vehicle data and the like. It is explanatory drawing in the case of receiving vehicle data from a plurality of vehicle-mounted control units. It is a flowchart of the processing of CPU in 1st Embodiment. It is explanatory drawing of the main menu screen. It is explanatory drawing of the vehicle-mounted control unit and the item selection screen. It is explanatory drawing of the confirmation screen of selection information. It is explanatory drawing of the test result screen. It is a functional block diagram of the CPU in the 2nd Embodiment. It is explanatory drawing of the diagnostic purpose database. It is explanatory drawing of the diagnosis purpose selection screen. It is a flowchart of processing of CPU in 2nd Embodiment.

<1. Overall configuration of the embodiment>
FIG. 1 is a block diagram showing a state in which the failure diagnosis device 1 as the first embodiment of the present invention is connected to the vehicle control system 2. In the present embodiment, the failure diagnosis device 1 is connected to the vehicle control system 2 via the vehicle interface 3.

[1-1. Configuration of fault diagnosis device]
First, the configuration of the failure diagnosis device 1 will be described with reference to FIG. The failure diagnosis device 1 can be realized as a computer device as shown in FIG. 1 capable of information processing and information communication. The failure diagnosis device 1 in this example is configured as, for example, a PC (Personal Computer).

In FIG. 1, the CPU (Central Processing Unit) 101 of the failure diagnosis device 1 follows a program stored in the ROM (Read Only Memory) 102 or a program loaded from the storage unit 108 into the RAM (Random Access Memory) 103. Execute various processes. The RAM 103 also appropriately stores data and the like necessary for the CPU 101 to execute various processes.

The CPU 101, ROM 102, and RAM 103 are connected to each other via the bus 104. An input / output interface 105 is also connected to the bus 104.
The input / output interface 105 includes an input unit 106 including a keyboard, a mouse, and a touch panel, a display including an LCD (Liquid Crystal Display), a CRT (Cathode Ray Tube), an organic EL (Electroluminescence) panel, and an output including a speaker. A storage unit 108 composed of a unit 107, an HDD (Hard Disk Drive), a flash memory device, and the like is connected. Further, the input / output interface 105 is subjected to communication processing with an external device, particularly communication processing with each control unit (vehicle-mounted control unit) of the vehicle control system 2 which can be connected via the vehicle interface 3 in the present embodiment. The communication unit 109 that performs the above is connected. The communication unit 109 in this example is capable of performing communication corresponding to the USB (Universal Serial Bus) standard.
Further, a media drive 110 is connected to the input / output interface 105 as needed, and a removable media 111 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory is appropriately mounted to write information to the removable media 111. And read.
The communication between the communication unit 109 and the vehicle interface 3 may be wireless communication instead of wired communication.

In such a failure diagnosis device 1, data and programs can be uploaded and downloaded by communication by the communication unit 109, and data and programs can be delivered via the removable media 111. When the CPU 101 performs a processing operation based on various programs, necessary information processing and communication as the failure diagnosis device 1 are executed.

The failure diagnosis device 1 has a function of receiving data indicating vehicle information (hereinafter referred to as “vehicle data”) from a control unit in the vehicle control system 2 and presenting the data to a diagnostician who diagnoses the failure of the vehicle. The presentation of vehicle information based on the received vehicle data is performed using the display of the output unit 107.

[1-2. Vehicle control system configuration]
As shown in FIG. 1, the vehicle control system 2 includes a driving support control unit 201, a memory 202, an image processing unit 203, an imaging unit 204, an engine control unit 211, a transmission control unit 212, a brake control unit 213, and a display control unit 214. The engine-related actuator 221 and the transmission-related actuator 222, the brake-related actuator 223, the display unit 224, and the bus B are provided. Note that FIG. 1 mainly extracts and shows only the configuration of the main part according to the present invention from the configuration of the vehicle control system 2.
Each of the above control units is configured to include, for example, a microcomputer equipped with a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. These control units are connected via the bus B, and data communication can be performed with each other. In this example, as the communication protocol of the bus B, for example, a protocol by CAN (Controller Area Network) is adopted.
Hereinafter, each of the above control units will also be referred to as an “in-vehicle control unit”.

The driving support control unit 201 executes various control processes for driving support (hereinafter referred to as "driving support control process"). The driving support control process is performed based on, for example, the captured image data obtained by the imaging unit 204 that images the front of the vehicle. In this example, the image processing unit 203 detects an object such as a preceding vehicle or an obstacle existing in front of the vehicle based on the image data captured by the image capturing unit 204, and also detects the size of the object, the distance to the object, and the relative speed. Acquire object information such as. The memory 202 temporarily stores captured image data, result information of object detection processing, and the like. The driving support control unit 201 executes the driving support control process based on the result information of the object detection process obtained by the image processing unit 203.
The driving support control unit 201 is one of the driving support control processes, such as a process for realizing cruise control with inter-vehicle distance control (ACC: Adaptive Cruise Control) as an auto cruise control, and a process for realizing pre-crash brake control. Perform processing, etc.

The engine control unit 211 controls the operation of the engine by controlling various actuators provided as engine-related actuators 221 based on detection signals from various sensors provided in the vehicle, operation input information by an operator, and the like. .. As the engine-related actuator 221, various actuators related to engine drive such as a throttle actuator for driving a throttle valve and an injector for injecting fuel are provided. Further, examples of various sensors include a vehicle speed sensor, a throttle opening degree sensor, and an accelerator pedal opening degree sensor.

The transmission control unit 212 controls various actuators provided as the transmission-related actuator 222 based on detection signals from various sensors provided in the vehicle, operation input information by the operator, and the like. As the transmission-related actuator 222, for example, an actuator for performing shift control of an automatic transmission is provided.
For example, when the automatic shift mode is selected in the vehicle, the transmission control unit 212 outputs a shift signal to the actuator according to a predetermined shift pattern to perform shift control. Further, when the manual shift mode is set, the transmission control unit 212 outputs a shift signal according to the shift up / down operation to the actuator to perform shift control.

The brake control unit 213 controls various actuators provided as brake-related actuators 223 based on detection signals from various sensors provided in the vehicle, operation input information by the operator, and the like. As the brake-related actuator 223, various brake-related actuators such as a hydraulic pressure control actuator for controlling the output hydraulic pressure from the brake booster to the master cylinder and the hydraulic pressure in the brake fluid piping are provided. For example, the brake control unit 213 controls the hydraulic pressure control actuator to brake the own vehicle based on the above information indicating the hydraulic pressure. Further, the brake control unit 213 calculates the wheel slip ratio from the detection information of a predetermined sensor (for example, an axle rotation speed sensor or a vehicle speed sensor), and presses or depressurizes the hydraulic pressure by the hydraulic pressure control actuator according to the slip ratio. By doing so, so-called ABS (Antilock Brake System) control is realized.

The display control unit 214 controls the display operation by the display unit 224 based on detection signals from various sensors provided in the vehicle, operation input information by the operator, and the like. For example, based on an instruction from the driving support control unit 201, it is possible to display a predetermined warning message on the display unit 224 as a part of the driving support.
The display unit 224 is a display device for presenting information to the driver, such as various meters such as a speedometer and a tachometer, an MFD (Multi Function Display) provided in a meter panel installed in front of the driver. Is comprehensively represented. Various information such as the total mileage of the own vehicle, the outside air temperature, the instantaneous fuel consumption, and the like can be displayed on the MFD at the same time or by switching.

Here, in each control unit of the driving support control unit 201, the engine control unit 211, the transmission control unit 212, the brake control unit 213, and the display control unit 214, the vehicle control system 2 and the failure diagnosis device 1 provide the vehicle interface 3. When connected via the vehicle, vehicle data is transmitted in response to a transmission request from the CPU 101 of the failure diagnosis device 1. Examples of the vehicle data that can be transmitted by the driving support control unit 201 include vehicle data obtained by the image processing unit 203, such as vehicle data indicating the distance between the vehicle and the preceding vehicle and the relative speed with the preceding vehicle. Further, as the information that can be transmitted by the engine control unit 211, the transmission control unit 212, and the display control unit 214, for example, detection data by a sensor connected to these control units can be mentioned. Specifically, the engine control unit 211 includes vehicle data such as vehicle speed, throttle opening, and accelerator pedal opening, and the transmission control unit 212 includes the transmission case temperature, gear ratio, and rotation of the power transmission shaft. Vehicle data such as a number can be mentioned, and if it is the display control unit 214, vehicle data such as the outside temperature can be mentioned. Further, as the information that can be transmitted by the brake control unit 213, for example, the drive current value of the brake-related actuator 223 such as the hydraulic pressure control actuator described above can be mentioned.

[1-3. Vehicle interface configuration]
As shown in FIG. 1, the vehicle interface 3 includes at least a conversion unit 301. The conversion unit 301 performs mutual data format conversion between the communication data according to the bus communication standard of the vehicle control system 2 and the communication data according to the communication standard by the communication unit 109 of the failure diagnosis device 1. Specifically, in this example, mutual data format conversion between CAN communication data and USB communication data is performed.
As a result, bidirectional communication can be performed between the failure diagnosis device 1 and each in-vehicle control unit in the vehicle control system 2.

<2. CPU function configuration>
FIG. 2 is a functional block diagram showing a functional configuration of the CPU 101 of the failure diagnosis device 1 according to the embodiment. In the functional block diagram, various processes executed by the CPU 101 are divided into blocks for each function.
As shown in FIG. 2, the CPU 101 includes a receiving unit 11, a measuring unit 12, a calculation unit 13, and a presentation control unit 14.

The receiving unit 11 sequentially makes a request to a plurality of vehicle-mounted control units for which vehicle information is acquired, and receives vehicle data for each vehicle-mounted control unit. Since it is required to monitor the transition of the vehicle data detected on the vehicle side in the failure diagnosis, the transmission request and the reception of the vehicle data by the receiving unit 11 are repeatedly performed for each target vehicle-mounted control unit.

The measuring unit 12 measures the reception interval of vehicle data by the receiving unit 11 for each in-vehicle control unit.
FIG. 3 is an explanatory diagram when the receiving unit 11 receives the vehicle data of a certain vehicle-mounted control unit.
The reception interval refers to the time elapsed from the reception unit 11 receiving the vehicle data of a certain vehicle-mounted control unit to the reception of the next vehicle data of the vehicle-mounted control unit. In FIG. 3, the reception interval is shown as “t0”.

Returning to FIG. 2, the calculation unit 13 calculates a margin value for each vehicle-mounted control unit based on the maximum allowable communication interval T set for each vehicle-mounted control unit and the reception interval measured by the measuring unit 12.
The maximum allowable communication interval T is a timeout time defined in the communication standard for the transmission request interval of vehicle data, and a different value can be set for each in-vehicle control unit. The in-vehicle control unit determines that a communication timeout error occurs when the next transmission request is not made within the time length set as the maximum allowable communication interval T from the timing of transmitting the vehicle data in response to the transmission request. Then, the error information is output according to the determination of the timeout error.
In the case of FIG. 3, regarding the reception of vehicle data from the same vehicle-mounted control unit, the reception interval of each vehicle data is sufficiently shorter than the maximum allowable communication interval T defined for the vehicle-mounted control unit. In that case, no communication error occurs.
The difference between the maximum allowable communication interval T and the reception interval t0 is called the margin time (see "t1" in FIG. 3).

As shown in FIG. 3, when the receiving unit 11 receives vehicle data from one in-vehicle control unit, it is not usually assumed that the reception interval t0 exceeds the maximum allowable communication time T.
However, when vehicle data is acquired from a plurality of vehicle-mounted control units and presented, as shown in FIG. 4, the interval between transmission requests in a certain vehicle-mounted control unit (“vehicle-mounted control unit A” in FIG. 4) is the relevant. The maximum allowable communication interval T of the in-vehicle control unit may be exceeded, and a communication error may occur. Since the vehicle-mounted control unit in which the communication error has occurred does not transmit the vehicle data in response to the transmission request, the vehicle data presentation process in the failure diagnosis device 1 ends abnormally due to the communication error.

Therefore, in the present embodiment, in order to prevent such abnormal termination, a margin value is calculated based on the maximum allowable communication interval T and the measured reception interval for each in-vehicle control unit. The margin value means an index value indicating a margin of the reception interval with respect to the maximum allowable communication interval T. In this example, the calculation unit 13 calculates the margin ratio, which is the ratio of the margin time t1 in the maximum allowable communication interval T, as the margin value.

The presentation control unit 14 causes the output unit 107 to present information representing the margin based on the margin value (margin ratio) calculated by the calculation unit 13. Specifically, it is displayed on the display of the output unit 107. The details of the information representing the margin will be described later.

<3. Processing procedure>
A specific processing procedure executed by the CPU 101 in order to realize the function of the embodiment described above will be described with reference to the flowchart of FIG. Further, the transition of the display screen accompanying the processing will be described with reference to FIGS. 6 to 9.

First, in step S101, the CPU 101 displays the main menu screen 30 as shown in FIG. 6 on the display of the output unit 107. The main menu screen 30 is a screen for selecting various functions that can be executed by the failure diagnosis device 1.
The main menu screen 30 is provided with a plurality of function selection buttons 31 (five examples of 31a to 31e in the figure). Various functions that can be executed by the failure diagnosis device 1 are associated with the plurality of function selection buttons 31. When the CPU 101 receives the selection information of any of the function selection buttons 31, the CPU 101 executes the function corresponding to each function selection button 31.

In FIG. 5, the CPU 101 waits until the function selection button 31b corresponding to the “multiple unit monitor” is operated in step S102, and if there is such an operation, proceeds to step S103 as shown in FIG. The selection screen 40 is displayed on the display of the output unit 107.
In FIG. 7, on the selection screen 40, a unit list area 41 for selectively displaying a list of vehicle-mounted control units for which vehicle information is to be acquired and detailed items of vehicle information that can be acquired from the selected vehicle-mounted control unit can be selected. The item list area 42 listed in the above and the decision button 43 are provided.

In step S104, the CPU 101 performs an operation acceptance process. That is, the CPU 101 performs screen content update processing (for example, adding a check mark to a check box in which a check operation has been performed) according to an operation on the selection screen 40. Then, in the following step S105, the CPU 101 determines whether or not the determination operation, that is, the operation of the determination button 43 has been performed, and if the determination operation has not been performed, the reception process of step S104 is executed.

When the determination operation is performed, the CPU 101 causes the confirmation screen 50 as shown in FIG. 8 to be displayed on the display in step S106.
The confirmation screen 50 asks the diagnostician to confirm the in-vehicle control unit and its items selected on the selection screen 40 of FIG. 7, and performs a test for confirming the communication margin, or does not perform the test and directly carries out the vehicle. This is a screen for selecting whether to perform a display operation for information monitoring. The confirmation screen 50 includes a selection unit confirmation area 51 for displaying the selected in-vehicle control unit, a selection item confirmation area 52 for displaying the selected items, a test execution button 53 as a test execution instruction button, and a diagnostician. An information monitoring execution button 54 is provided as an execution instruction button for a display operation for monitoring vehicle information.

The CPU 101 determines whether or not a test operation (operation of the test execution button 53) has been performed in step S107 following step S106, and if no test operation has been performed, an information monitoring execution operation (information monitoring execution) in step S111. It is determined whether or not the button 54 operation) has been performed, and if the information monitoring execution operation has not been performed, the process returns to step S107. That is, it waits until either a test operation or an information monitoring execution operation is performed.

When the information monitoring execution operation is performed in step S111, the CPU 101 proceeds to step S112 and starts the information monitoring display processing. That is, the CPU 101 transmits the vehicle data of each item selected on the selection screen 40 and displayed in the list on the confirmation screen 50 by making a transmission request to the corresponding in-vehicle control unit, and displays the received vehicle data on the display. Start the process to make it. At this time, the CPU 101 repeatedly requests transmission of vehicle data corresponding to each vehicle-mounted control unit, and displays the vehicle data on the display each time vehicle data is received in response to the transmission request. This makes it possible for the diagnostician to monitor the transition of vehicle information.

In the following step S113, the CPU 101 waits until the end condition of the information monitoring display process is satisfied. Examples of the end condition include the fact that the end operation has been performed by the diagnostician, the elapse of a preset diagnosis time (monitoring time), and the like.
When the end condition is satisfied, the CPU 101 ends the process shown in this figure.

If the test operation is performed in step S107 described above, the CPU 101 proceeds to step S121 to start the test process. In the test process, in order to calculate the margin rate described above, the vehicle data of each item selected on the selection screen 40 and displayed in a list on the confirmation screen 50 is supported in the same manner as the information monitoring display process in step S112. The process of receiving is repeated by making a transmission request to the in-vehicle control unit. During this period, in the test process, the above-mentioned reception interval is measured for each in-vehicle control unit that has made the transmission request.

In the following step S122, the CPU 101 waits until the end of the test. In this example, the test execution time (for example, 5 minutes, 10 minutes, etc.) is set in advance, and the test process ends according to the elapse of the test execution time from the start of the test in step S121.
The test process may be terminated according to the operation.

When the test is completed, the CPU 101 calculates the margin rate and the number of recommended items in step S123.
The margin rate is calculated for each vehicle-mounted control unit based on the reception interval measured for each vehicle-mounted control unit in the above test process and the maximum allowable communication interval T set for each vehicle-mounted control unit. Here, during the test process, the vehicle data is repeatedly received from each in-vehicle control unit, so that the reception interval is measured a plurality of times for each in-vehicle control unit. In this example, the CPU 101 calculates the margin ratio for each in-vehicle control unit each time the reception interval is newly measured. That is, in the process of step S123, a plurality of margin ratios are calculated for each in-vehicle control unit. The margin ratio calculated a plurality of times for each in-vehicle control unit can have different values due to changes in communication conditions and the like.

The recommended number of items is a kind of item selection number suggestion value suggesting the number of item selections allowed to secure the communication margin, and is calculated for each in-vehicle control unit in this example. The recommended number of items may be calculated so that the margin rate calculated as a result of the test process is at least lower than the target margin rate. In this example, the number of recommended items is calculated for each in-vehicle control unit by the following method.
● Reduction value Basic coefficient = margin rate / target margin rate is calculated.
At this time, as the margin rate, one of a plurality of margin rates calculated for the target vehicle-mounted control unit (vehicle-mounted control unit for which the reduction value basic coefficient is calculated) is used. Specifically, in this example, the margin ratio calculated from the maximum reception interval and the maximum allowable communication interval T is used.
The reduction value basic coefficient is "1" when "1" or more, and has a value from "1" to "0".
● Set the reduction value coefficient according to the following rules.
-Reduction value coefficient = If the reduction value basic coefficient is within the range of "1" to "0.5", it is set as the value of the reduction value basic coefficient.
-If the reduction value basic coefficient is less than "0.5", it is set to "0.5".
● Number of recommended items = Number of selected items x Reduction value coefficient.
The “number of selected items” means the number of items selected for the target vehicle-mounted control unit.

In response to the execution of the calculation process in step S123, the CPU 101 proceeds to step S124 to display the test result screen 60 as shown in FIG. 9 on the display.
In FIG. 9, the test result screen 60 displays the maximum value, the minimum value, the average value, and the maximum allowable communication interval T of the measured reception intervals for each in-vehicle control unit whose vehicle data is acquired in the test process. are doing. In this example, the information on the reception interval is displayed in a bar graph, and the information on the maximum allowable communication interval T is also displayed in an manner matching the graph.
Further, on the test result screen 60, information on the margin rate for each in-vehicle control unit (for example, the margin rate calculated using the maximum reception interval), the number of selected items, and the number of recommended items calculated in step S123 is displayed. There is.
When the diagnostician receives the presentation of the margin rate calculated as the test result and performs the information monitoring display processing (so to speak, the display processing as the actual production) for the failure diagnosis for the selected item, the display processing is performed. It is possible to easily grasp the high / low possibility of abnormal termination due to a communication error.
In addition, by receiving the presentation of the recommended number of items, the diagnostician can easily grasp the allowable number of item selections in case the item needs to be reselected in order to prevent abnormal termination of the information monitoring display processing. can do.

Here, the test result screen 60 is provided with an information monitoring execution button 61 and a reselection button 62 for recalling the selection screen 40 shown in FIG. 7, together with information representing the test result such as the above margin ratio. ing.

The CPU 101 determines whether or not the reselection operation (operation of the reselection button 62) has been performed in step S125 in response to executing the display process of the test result screen 60 in step S124, and the reselection operation is performed. If not, it is determined in step S126 whether or not the information monitoring execution operation (operation of the information monitoring execution button 61) has been performed, and if the information monitoring execution operation has not been performed, the process returns to step S125. That is, it waits until either the reselection operation or the information monitoring execution operation is performed.

When the reselection operation is performed in step S125, the CPU 101 returns to step S103 and performs display processing on the selection screen 40. As a result, the diagnostician can reselect the in-vehicle control unit and items in response to the case where it is determined that there is no communication margin.

On the other hand, when the information monitoring execution operation is performed in step S126, the CPU 101 proceeds to step S112 to start the information monitoring display processing.

In the above, an example of calculating the recommended number of items is given as an item selection number suggestion value that suggests the number of item selections allowed to secure the communication margin, but the item selection number suggestion value is communication. The number of items to be deleted in order to secure a margin (hereinafter referred to as "the number of items to be deleted") may be calculated. As the number of items to be deleted, for example, it is conceivable to calculate according to the difference between the margin rate calculated according to the test process and the target margin rate. Specifically, for example, the value (β) of the number of items to be deleted per 1% of the margin rate is determined, and the value of the difference between the margin rate and the target margin rate is multiplied by the value (β) to obtain the number of items to be deleted. An example of this can be given.

<4. Second Embodiment>
The second embodiment will be described with reference to FIGS. 10 to 13.
The second embodiment is a system in which a diagnostician is made to select a diagnostic purpose using the failure diagnosis device 1, and an in-vehicle control unit or an item to be displayed is automatically selected by information monitoring display processing based on the diagnostic purpose. It is a premise.
In the following, the parts with the same reference numerals and the processes with the same step numbers in the drawings will not be duplicated with the parts having the same function and the same processes unless otherwise specified.

[4-1. CPU function configuration and database]
FIG. 10 is a functional block diagram showing a functional configuration of the CPU 101 of the failure diagnosis device 1 according to the second embodiment.
The CPU 101 of the failure diagnosis device 1 according to the second embodiment includes a determination unit 15 and a selection unit 16 in addition to the functional configuration of the first embodiment.

The determination unit 15 determines a diagnostic purpose using the failure diagnosis device 1. Various categories such as "acceleration control diagnosis", "driving support control diagnosis" such as auto cruise control, and "body system control diagnosis" such as brake control can be considered as the purpose of diagnosis.

In the failure diagnosis device 1 of the second embodiment, the diagnostic purpose DB (database) 20 to which the in-vehicle control unit to be selected for each diagnostic purpose and the item information of the vehicle information are associated with each other is stored (FIG. 10). And FIG. 11). As an example, in the diagnostic purpose DB 20, as shown in FIG. 11, a vehicle in which the in-vehicle control unit as the engine control unit 211 and the engine control unit 211 such as the engine speed can be acquired for the diagnostic purpose of "acceleration control diagnosis". Item information of information is associated.
Further, particularly in the case of this example, the diagnostic purpose DB 20 is associated with priority information for each item of vehicle information.

The failure diagnosis device 1 (CPU101) of the second embodiment has a diagnostic purpose selection screen as shown in FIG. 12 in response to the operation of the plurality of unit monitoring buttons 31b on the main menu screen 30 shown in FIG. 70 is displayed on the display.
As shown in the figure, on the diagnostic purpose selection screen 70, a plurality of purpose selection buttons 71 are provided for each diagnostic purpose. In the present embodiment, for example, purpose selection buttons 71a, 71b, 71c corresponding to the diagnostic purposes of "acceleration control diagnosis", "driving support control diagnosis", and "vehicle body system control diagnosis" are provided.

When the diagnostician selects and operates any of the purpose selection buttons 71, the confirmation screen 50 as shown in FIG. 8 is displayed on the display. In this case, the confirmation screen 50 is the operated purpose selection button 71. A screen is displayed in which the in-vehicle control unit and items are selected according to the diagnostic purpose specified from. In selecting the vehicle-mounted control unit and the item at this time, the CPU 101 refers to the information on the vehicle-mounted control unit and the item stored in the diagnostic purpose DB 20.

In FIG. 10, the determination unit 15 of this example determines the diagnosis purpose using the failure diagnosis device 1 based on the diagnosis purpose selection operation on the diagnosis purpose selection screen 70 as described above.
The determination method for the purpose of diagnosis is not limited to the above method. For example, under the premise that the diagnostician manually selects the item to be monitored as in the first embodiment, the selected item. It is also possible to make a judgment according to the above.

The selection unit 16 selects an item based on the margin ratio calculated by the calculation unit 13 according to the test process. There are various possible methods for selecting items according to the results of such test processing. For example, in this example, a non-margin unit having a poor communication margin (for example, a vehicle-mounted control unit having a margin ratio> a target margin ratio) is selected based on the margin ratio and the target margin ratio calculated for each vehicle-mounted control unit by the calculation unit 13. A method is adopted in which the detection process is performed and the selection unit 16 selects an item only when the non-margin unit is detected. At this time, the item selection is performed so that at least the margin ratio of the detected non-margin unit is less than the target margin ratio. For example, it is conceivable to calculate the number of recommended items as described above and select the items with the number of recommended items as the target number of selected items.
By the above item selection method, it is possible to prevent the process for item selection from being performed indiscriminately when the non-margin unit does not exist.

Further, the selection unit 16 of this example performs the above item selection based on the diagnostic purpose determined by the determination unit 15. That is, in the diagnostic purpose DB 20, item selection is performed based on the information associated with the determined diagnostic purpose. At this time, when selecting an item, the priority information associated with each item is used. Specifically, when it is necessary to deselect an item from the viewpoint of communication margin, the item having a low priority is preferentially deselected.
As a result, it is possible to make it difficult for items that are highly necessary for diagnostic purposes to be deselected in response to a case where items need to be reselected in order to prevent abnormal termination of the information monitoring display process.

[4-2. Processing procedure]
A specific processing procedure executed by the CPU 101 in order to realize the function of the second embodiment described above will be described with reference to the flowchart of FIG.
First, in this case, the CPU 101 causes the diagnosis purpose selection screen 70 to be displayed on the display of the output unit 107 in step S131 in response to the operation of the plurality of unit monitoring buttons 31b on the main menu screen 30 in step S102, and the subsequent step. It waits until any of the purpose selection buttons 71 is operated in S132. Then, when the purpose selection button 71 is operated, the CPU 101 selects an item corresponding to the diagnosis purpose based on the information content of the diagnosis purpose DB 20 in step S133, and displays the confirmation screen 50 in the subsequent step S106. As understood from the above description, as the confirmation screen 50 in this case, a screen in which the in-vehicle control unit or the item corresponding to the diagnostic purpose specified by the operated purpose selection button 71 is selected is displayed.

Further, when the test is completed in step S122, the CPU 101 in this case performs the detection process of the non-margin unit in step S141, for example, by the method described above. In step S141, the margin ratio for each in-vehicle control unit required for detecting the non-margin unit is calculated using one reception interval out of the reception intervals measured a plurality of times for each in-vehicle control unit in the test process. To do. Specifically, in this example, the maximum reception interval is used. As a result, the detection accuracy of the non-margin unit can be improved.

In the following step S142, the CPU 101 determines whether or not a non-margin unit exists based on the result of the detection process in step S141, and if it is determined that the non-margin unit does not exist, proceeds to step S112 to perform information monitoring display processing. Start. That is, in this case, since the communication margin is sufficient, the information monitoring display process is started for the item selected in step S133.

On the other hand, if it is determined in step S142 that the non-margin unit exists, the CPU 101 reselects the item in step S143. That is, as described above, the items to be acquired (items to be displayed for information monitoring) are selected based on the diagnostic purpose selected by the diagnostician and the information content of the diagnostic purpose DB 20.
Then, after performing the reselection process in step S143, the CPU 101 proceeds to step S112 to start the information monitoring display process.

In the above, an example of directly shifting from the reselection process of step S143 to the information monitoring display process of step S112 has been given, but the process shifts to the confirmation screen display process of step S106 according to the execution of the reselection process of step S143. This may give the diagnostician room to select items.
Further, in the above, an example in which the non-margin unit determination processing is performed in order to reselect the items according to the test processing result is given, but the non-margin unit determination processing is not essential. For example, as described in the first embodiment, the number of recommended items is calculated for each in-vehicle control unit, and the number of recommended items is set as the target number of selected items for each in-vehicle unit to reselect items. You can also. In that case, the processing of detecting and determining the non-margin unit can be unnecessary.

Further, in each embodiment, an example of calculating the margin rate as a "margin value" is given, but as the "margin value", for example, the above-mentioned margin time (see FIG. 3) is calculated, and various calculation methods are used. It is conceivable.
Further, in each embodiment, the margin value is calculated using the maximum reception interval, but the margin value is calculated using the value selected by the operation or the like from the average value, the minimum value, the latest value, etc. of the reception interval. It can also be calculated.

Further, in the above, an example in which the "margin value" is presented by displaying visual information has been given, but the presentation can also be realized by, for example, outputting audio information.

<5. Summary>
The failure diagnosis device (1) as the above-described embodiment is a failure diagnosis device that causes a presentation unit (output unit 107) to present vehicle information based on data (vehicle data) indicating vehicle information received from an in-vehicle control unit. , A receiving unit (11) that sequentially requests a plurality of vehicle-mounted control units for which vehicle information is acquired and receives vehicle data for each vehicle-mounted control unit, and a receiving unit for receiving vehicle data for each vehicle-mounted control unit. Based on the measurement unit (12) that measures, the maximum allowable communication interval (T) set for each vehicle control unit, and the reception interval measured by the measurement unit, the reception interval for the maximum allowable communication interval for each vehicle control unit It is provided with a calculation unit (13) for calculating a margin value which is an index value indicating a margin, and a presentation control unit (14) for causing a presentation unit to present information representing a margin based on the margin value calculated by the calculation unit. There is.

As a result, for the in-vehicle control unit for which the vehicle information is acquired, the presentation unit is presented with the margin of the reception interval with respect to the maximum allowable communication interval.
Therefore, since it is possible to prompt the diagnostician to pre-adjust the amount of vehicle information acquired in the failure diagnosis, it is possible to prevent abnormal termination of the vehicle information presentation process due to the communication timeout error of the vehicle-mounted control unit.

Further, in the failure diagnosis device of the embodiment, each of the in-vehicle control units can acquire information by a plurality of items as vehicle information, and the receiving unit can acquire each in-vehicle control unit as vehicle data. In order to request and receive the vehicle data of the item selected for each in-vehicle control unit among the various vehicle information, the calculation unit secures the margin of the in-vehicle control unit based on the margin value calculated for the in-vehicle control unit. The item selection number suggestion value that suggests the number of allowable item selections is calculated, and the presentation control unit causes the presentation unit to present the numerical information represented by the item selection number suggestion value calculated by the calculation unit.

This makes it possible to suggest the number of item selections allowed to the diagnostician in response to the case where items need to be reselected in order to prevent abnormal termination of the vehicle information presentation process.
Therefore, it is possible to facilitate the item reselection by the diagnostician. Specifically, it is possible to prevent the occurrence of a situation in which the diagnostician repeatedly selects items in order to secure a communication margin.

Further, in the failure diagnosis device of the embodiment, each of the in-vehicle control units can acquire information by a plurality of items as vehicle information, and the receiving unit can acquire each in-vehicle control unit as vehicle data. It is provided with a selection unit (16) that requests and receives vehicle data of an item selected for each in-vehicle control unit among various vehicle information, and selects an item based on a margin value calculated by the calculation unit.

As a result, the item is automatically reselected by the failure diagnosis device based on the margin value in response to the case where the item needs to be reselected in order to prevent the abnormal termination of the vehicle information presentation process.
Therefore, the burden of item reselection by the diagnostician can be reduced.

Further, the failure diagnosis device of the embodiment includes a determination unit (15) for determining a diagnosis purpose using the failure diagnosis device, and the selection unit selects an item based on the diagnosis purpose determined by the determination unit. ing.

This makes it possible to make it difficult for items required for diagnostic purposes to be deselected in response to the case where items need to be reselected in order to prevent abnormal termination of the vehicle information presentation process. ..
Therefore, it is possible to achieve both prevention of abnormal termination of vehicle information presentation processing due to a communication error and contribution to appropriate vehicle failure diagnosis.

Further, in the failure diagnosis device of the embodiment, the calculation unit calculates the margin value for each in-vehicle control unit by using the maximum reception interval among the reception intervals measured by the measurement unit.

As a result, the margin value is calculated and presented based on the reception interval calculated under the strictest communication conditions.
Therefore, the effect of preventing abnormal termination of the vehicle information presentation process can be enhanced.

1 Failure diagnosis device, 2 Vehicle control system, 3 Vehicle interface, 11 Receiver, 12 Measurement unit, 13 Calculation unit, 14 Presentation control unit, 15 Judgment unit, 16 Presentation unit, 101 CPU, 107 Output unit

Claims (5)

A failure diagnosis device that causes a presenting unit to present the vehicle information based on data indicating vehicle information received from a plurality of in- vehicle control units .
In the test process of receiving the data from each of the in-vehicle control units regardless of the maximum allowable communication interval set for each of the in-vehicle control units, the in-vehicle control units for which the vehicle information is acquired are sequentially requested. A receiver that goes and receives the data for each in-vehicle control unit,
A measuring unit that measures the data reception interval by the receiving unit for each in-vehicle control unit,
Based on the maximum allowable communication interval and the reception interval measured by the measurement unit, a calculation unit that calculates a margin value which is an index value indicating a margin of the reception interval with respect to the maximum allowable communication interval for each in-vehicle control unit. ,
A presentation control unit that causes the presentation unit to present information representing the margin based on the margin value calculated by the calculation unit.
A fault diagnostic device equipped with. Each of the in-vehicle control units can acquire information by a plurality of items as the vehicle information.
As the data, the receiving unit requests and receives data representing the vehicle information of the item selected for each vehicle-mounted control unit among the vehicle information that can be acquired by each vehicle-mounted control unit.
Based on the margin value calculated for the vehicle-mounted control unit, the calculation unit calculates an item selection number suggestion value that suggests the number of selections of the item that is allowed to secure the margin of the vehicle-mounted control unit.
The presentation control unit causes the presentation unit to present the numerical information represented by the item selection number suggestion value calculated by the calculation unit.
The failure diagnosis device according to claim 1. Each of the in-vehicle control units can acquire information by a plurality of items as the vehicle information.
As the data, the receiving unit requests and receives data representing the vehicle information of the item selected for each vehicle-mounted control unit among the vehicle information that can be acquired by each vehicle-mounted control unit.
A selection unit for selecting the item based on the margin value calculated by the calculation unit is provided.
The failure diagnosis device according to claim 1 or 2. It is equipped with a judgment unit that determines the purpose of diagnosis using the failure diagnosis device.
The selection unit selects the item based on the diagnostic purpose determined by the determination unit.
The failure diagnosis device according to claim 3. The calculation unit according to any one of claims 1 to 4, wherein the calculation unit calculates the margin value by using the maximum reception interval among the reception intervals measured by the measurement unit for each in-vehicle control unit. Failure diagnostic device.

Images