JP2016151471A - Vehicle inspection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle inspection device capable of efficiently performing inspection with respect to multiple electronic control devices mounted on a vehicle.SOLUTION: A vehicle inspection device 1 includes: an inspection processing unit 2 for generating a communication request; and a communication processing unit 3 for transmitting the communication request to the ECU of a transmission destination. The inspection processing unit 2 includes: an inspection control section 51 for generating multiple communication requests; a transmission flow control section 52 having a communication request buffer for storing multiple communication requests, writing the communication requests generated in the inspection control device 51 in memory areas divided for each ECU of transmission destinations of the communication requests of the communication request buffer, and also reading the communication requests stored in the communication request buffer in accordance with previously regulated scan order for each memory area; a communication request transmission buffer 53 for storing the communication requests read by the transmission flow control section 52; and a communication request transmission section 54 for transmitting the communication requests stored in the communication request transmission buffer 53 to the communication processing unit 3.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle inspection apparatus. More specifically, a vehicle that communicates with a plurality of electronic control devices mounted on the vehicle from the outside of the vehicle and determines pass / fail of a plurality of inspection items based on data acquired from the electronic control device of the vehicle through this communication. It relates to an inspection device.

  The vehicle has a plurality of vehicle parts such as an engine, an exhaust emission control device, and a sensor, and a plurality of electronic control devices for electronic control of these vehicle parts (hereinafter referred to as “ECU (Electric Control Unit)”). May be used). A vehicle inspection device for inspecting these vehicle parts and ECU includes an on-board failure inspection device (so-called OBD (On-Board Diagnostics)) mounted on the vehicle, an on-vehicle failure inspection device used by connecting from outside the vehicle, It is divided into.

  The in-vehicle failure inspection apparatus includes an in-vehicle ECU that inspects whether or not the above-described parts or the like are in failure while the vehicle is traveling, and a warning lamp that notifies the user when a failure is detected.

  The out-of-vehicle failure inspection apparatus is a computer having a communication function, and is called a scan tool or a test tool. The out-of-vehicle failure inspection device is used by connecting to a plurality of ECUs mounted on the vehicle via a test port, and whether or not these plurality of ECUs and a plurality of parts controlled by these are not in failure. Inspect using the function. More specifically, the out-of-vehicle failure inspection apparatus transmits a communication request determined according to the inspection item to a specific ECU of the vehicle, and determines whether the inspection item is good or bad by using a response from the ECU to the communication request. judge.

  This out-of-vehicle failure inspection device is used, for example, in a final inspection of a vehicle manufactured in a production factory. In this case, it is necessary to continuously determine the quality of many inspection items. For this reason, techniques for improving the efficiency of inspection by an out-of-vehicle failure inspection apparatus have been proposed. For example, in Patent Document 1, when a plurality of inspection programs are simultaneously executed and the types of communication requests to the ECU of the vehicle are the same, the amount of communication data is reduced by collectively transmitting this type of data to the ECU. Technology to do is shown. Patent Document 2 discloses a technique for improving the efficiency of a writing process by dividing and transmitting a program to be written in a plurality of ECUs. In the following, when simply referred to as a vehicle inspection device, this means an out-of-vehicle failure inspection device.

JP 2011-107042 A JP-A-2005-78324

  FIG. 9 is a diagram illustrating a configuration of the vehicle inspection device 100 and a vehicle V to which the vehicle inspection device 100 is connected.

  The vehicle inspection apparatus 100 includes an inspection processing unit 101 that performs processing such as execution of a program according to an inspection item and determination of pass / fail of the inspection item, and between the inspection processing unit 101 and a plurality of ECUs mounted on the vehicle V. A communication processing unit 102 responsible for processing related to communication. The inspection processing unit 101 executes an inspection program determined for each inspection item according to an order determined by the user or according to a predetermined order, and generates a plurality of communication requests including control commands for a specific ECU of the vehicle V. These are transmitted to the communication processing unit 102. The communication processing unit 102 transmits the communication request transmitted from the inspection processing unit 101 to the transmission destination ECU, receives a response to the communication request from the same ECU, and transmits this to the inspection processing unit 101. The inspection processing unit 101 determines pass / fail of the inspection item by using the received response.

  In this way, communication between the inspection processing unit 101 and the communication processing unit 102 is performed via a data signal regarding a communication request to the vehicle V and a response from the vehicle V. At this time, since there is an upper limit on the number of communication requests transmitted from the inspection processing unit 101 in the communication processing unit 102 at the same time, in the inspection processing unit 101, the communication processing unit 102 depends on the state of the communication processing unit 102. So-called flow control is performed to reduce or increase the number of communication requests transmitted to the network. By performing such flow control, it is possible to prevent the communication processing unit 102 from missing a communication request.

  However, in the flow control in the conventional vehicle inspection apparatus, only the number of communication requests transmitted from the inspection processing unit 101 to the communication processing unit 102 is controlled, and the order is not considered. For this reason, when the communication request | requirement toward the same ECU is continuously transmitted in multiple times from the test | inspection process part 101 to the communication process part 102, test | inspection efficiency may fall as follows.

  In the communication processing unit 102, while the communication request is being processed (that is, from when the communication request is received, until the communication request is transmitted to a specific ECU and a response to the communication request is received), A new communication request exceeding the upper limit number cannot be received from the inspection processing unit 101. In order to ensure the reliability of the inspection, a plurality of communication requests are not transmitted to the ECU at the same time. For this reason, when a plurality of communication requests are concentrated on a specific ECU as described above, the communication processing unit 102 is in a communication waiting state until the processing for all the communication requests in the specific ECU is completed. Cannot receive new communication requests.

  When such a situation occurs, the plurality of ECUs on the vehicle side can execute the inspection process in parallel, but only a specific ECU is in a state of executing the inspection process, resulting in a decrease in inspection efficiency. To do. As a result, the time taken until the pass / fail determination for all the inspection items is completed may be longer than necessary (more specifically, for example, see FIGS. 4 and 5 described later).

  An object of this invention is to provide the vehicle inspection apparatus which can test | inspect efficiently with respect to the some electronic control apparatus mounted in the vehicle.

  (1) A vehicle inspection apparatus according to the present invention (for example, vehicle inspection apparatuses 1, 1B, 1C described later) is installed in the vehicle by executing an inspection program determined in accordance with inspection items relating to the vehicle. An inspection processing unit (for example, 2, 2B, 2C, which will be described later) that generates a communication request to the electronic control device, and a communication request that is connected to the plurality of electronic control devices and is generated by the inspection processing unit. Communication processing units (for example, communication processing units 3, 3B, 3C described later) that transmit to the electronic control device, and determine whether the inspection item is acceptable based on a response from the vehicle to the communication request. The inspection processing unit includes an inspection control unit (for example, an inspection control unit 51 described later) that generates a communication request by executing the inspection program, and a communication request buffer (for example, a communication described later) that stores a plurality of the communication requests. A memory area (for example, buffers 522_1 to 522_n which will be described later) that is divided for each electronic control device that is the transmission destination of the communication request in the communication request buffer. ) And a communication flow control unit (for example, transmission flow control units 52 and 52B described later) for reading communication requests stored in the communication request buffer in accordance with a predetermined scanning order for each memory area, and the transmission flow A communication request transmitter that transmits a communication request read by the controller to the communication processor (for example, It includes a predicate communication request transmitter unit 54 of) the said communication processing unit, and transmits the communication request according to the order transmitted from the communication request transmitting unit in the vehicle.

  (2) In this case, when a communication request is generated by the communication request buffer and the inspection control unit, the transmission flow control unit specifies a transmission destination of the communication request and sends the communication request to the communication request buffer. A request transmission destination registration unit (for example, a request transmission destination registration unit 521 described later) to be written in a memory area corresponding to the specified transmission destination, and a communication request stored in each memory area of the communication request buffer in the scanning order. It is preferable to include a flow control unit (for example, a flow control unit 523, which will be described later).

  (3) In this case, the inspection processing unit includes a communication request transmission buffer (for example, a communication request transmission buffer 53 to be described later) that stores a communication request read by the transmission flow control unit. The communication request stored in the communication request transmission buffer is transmitted to the communication processing unit, and the communication processing unit receives a communication request transmitted from the communication request transmission unit (for example, described later) A communication request receiving unit 61), a communication request receiving buffer (for example, a communication request receiving buffer 62 described later) in which a communication request received by the communication request receiving unit is written, and a communication request stored in the communication request receiving buffer. A vehicle communication unit (for example, vehicle communication units 65 and 65B described later) that transmits the communication request to the electronic control device of the transmission destination, the communication request transmission buffer And said communication request receiving buffer preferably each is a cache memory configured based on a predetermined serial communication standard.

  (4) In this case, the communication request includes an address for specifying one of a plurality of electronic control devices mounted on the vehicle to be inspected, and control for the electronic control device specified by the address. It is preferable that the transmission flow control unit specifies a transmission destination using an address included in the communication request.

  (5) In this case, the vehicle includes a plurality of communication lines (for example, communication lines L1 to L3 described later) having different standards, and the memory area of the communication request buffer is divided for each of the electronic control unit and the communication line. When the communication request is generated by the inspection control unit, the transmission flow control unit is configured to store the communication request for each electronic control device to which the communication request is transmitted and the communication line in the communication request buffer. It is preferable to write in a region (for example, a communication request buffer of transmission flow control units 52Ba to 52Bc described later).

  (6) A vehicle inspection apparatus (for example, vehicle inspection apparatuses 1A, 1B, 1C described later) of the present invention is installed in the vehicle by executing an inspection program determined according to inspection items relating to the vehicle. An inspection processing unit (for example, inspection processing units 2, 2B, 2C described later) that generates a communication request for the electronic control device, and a communication request that is connected to the plurality of electronic control devices and is generated by the inspection processing unit. A communication processing unit (for example, communication processing units 3, 3B, 3C, which will be described later) that transmits to the electronic control device of the transmission destination, and whether the inspection item is acceptable or not based on a response from the vehicle to the communication request judge. The inspection processing unit includes an inspection control unit (for example, an inspection control unit 51 described later) that generates a communication request by executing the inspection program, and a communication request buffer (for example, a communication described later) that stores a plurality of the communication requests. A request buffer 522A) that writes a communication request generated by the inspection control unit to the communication request buffer, and that has one destination from the plurality of communication requests written to the communication request buffer. A transmission flow control unit (for example, a transmission flow control unit 52A described later) that selectively reads in an order that does not continue, and a communication request transmission that transmits a communication request read by the transmission flow control unit to the communication processing unit (For example, a communication request transmission unit 54 described later), and the communication processing unit follows the order of transmission from the communication request transmission unit. And transmitting the communication request to the vehicle Te.

  (7) In this case, the inspection processing unit includes a communication request transmission buffer (for example, a communication request transmission buffer 53 described later) that stores a communication request read by the transmission flow control unit, and the communication request transmission unit The communication request stored in the communication request transmission buffer is transmitted to the communication processing unit, and the communication processing unit receives a communication request transmitted from the communication request transmission unit (for example, described later) A communication request receiving unit 61), a communication request receiving buffer (for example, a communication request receiving buffer 62 described later) in which a communication request received by the communication request receiving unit is written, and a communication request stored in the communication request receiving buffer. A vehicle communication unit (for example, vehicle communication units 65 and 65B described later) that transmits the communication request to the electronic control device of the transmission destination, the communication request transmission buffer And said communication request receiving buffer preferably each is a cache memory configured based on a predetermined serial communication standard.

  (8) In this case, the communication request includes an address for specifying one of a plurality of electronic control devices mounted on the vehicle to be inspected, and control for the electronic control device specified by the address. It is preferable that the transmission flow control unit specifies a transmission destination using an address included in the communication request.

  (9) In this case, the vehicle includes a plurality of communication lines (for example, communication lines L1 to L3 described later) having different standards, and a memory area of the communication request buffer is partitioned for each communication line, and the transmission flow When a communication request is generated by the inspection control unit, the control unit divides the communication request into a memory area (for example, transmission flow control described later) divided for each communication line of the communication request transmission destination of the communication request buffer. It is preferable to write in the communication request buffers of the sections 52Ba to 52Bc.

  (1) In the transmission flow control unit of the present invention, a communication request buffer that is a plurality of memory areas partitioned for each of a plurality of electronic control devices mounted on the vehicle is provided, and a communication request generated by the inspection control unit is After writing in the memory area corresponding to the electronic control device that is the transmission destination of the communication request buffer, the written communication request is transmitted to the communication processing unit in accordance with a scanning order defined in advance for each of the plurality of memory areas. That is, in the inspection processing unit of the present invention, the communication requests generated by the inspection control unit are temporarily stored in the communication request buffer and then arranged in an order determined for each electronic control unit by the scanning process in the transmission flow control unit. After being replaced, it is transmitted to the communication processing unit. As a result, even when communication commands for a specific electronic control device are generated in a concentrated manner in the inspection control unit, communication requests for different electronic control devices are continuously transmitted to the communication processing unit, and thus the vehicle. Can be. That is, regardless of the order in which the communication requests are generated in the inspection control unit, the processing on the vehicle can be performed simultaneously on as many electronic control devices as possible on the vehicle side. And a plurality of electronic control devices can be efficiently inspected. In addition, this makes it possible to reduce the time required for inspection even when there are many inspection items for which pass / fail is to be determined.

  (2) In the present invention, the transmission flow control unit that performs the flow control as described above for a communication request includes a communication request selection unit, a communication request buffer, and a flow control unit. As a result, the process of distributing and writing communication requests to the communication request buffer and the process of reading the communication request written to the communication request buffer and writing it to the predetermined buffer can be performed by separate modules at independent timings. Therefore, the processing in the transmission flow control unit can be performed with high efficiency and high speed.

  (3) In the present invention, the communication request transmission buffer of the inspection processing unit and the communication request reception buffer of the communication processing unit are configured by a cache memory configured based on the serial communication standard. Thereby, for example, the USB communication standard can be adopted as communication between the inspection processing unit and the communication processing unit. As a result, high-speed processing can be performed while reducing the number of physical communication lines between the inspection processing unit and the communication processing unit.

  (4) In the present invention, the efficiency of processing in the transmission flow control unit can be improved by specifying the transmission destination using the address included in the communication request.

  (5) In the present invention, the memory area of the communication request buffer is partitioned for each electronic control unit and communication line, and the communication request is determined according to the destination electronic control unit and communication line in the memory area of the communication request buffer. Write on things. Thereby, even when a plurality of communication lines of different standards are provided in the vehicle, communication requests can be prevented from being concentrated on the same electronic control device, and as a result, the time required for inspection can be shortened. .

  (6) In the transmission flow control unit of the present invention, a communication request buffer for storing a plurality of communication requests is provided, and the communication request generated by the inspection control unit is written into the communication request buffer. The transmission flow control unit selectively reads one of the plurality of communication requests written in the communication request buffer in an order such that the same transmission destination does not continue, and transmits this to the communication processing unit. That is, in the inspection processing unit of the present invention, the communication request generated by the inspection control unit is temporarily stored in the communication request buffer, and then transmitted to the communication processing unit through a search by the transmission flow control unit. As a result, even when communication commands for a specific electronic control device are generated in a concentrated manner in the inspection control unit, communication requests for different electronic control devices are continuously transmitted to the communication processing unit, and thus the vehicle. Can be. That is, regardless of the order in which the communication requests are generated in the inspection control unit, the processing on the vehicle can be performed simultaneously on as many electronic control devices as possible on the vehicle side. And a plurality of electronic control devices can be efficiently inspected. In addition, this makes it possible to reduce the time required for inspection even when there are many inspection items for which pass / fail is to be determined.

  (7) In the present invention, the communication request transmission buffer of the inspection processing unit and the communication request reception buffer of the communication processing unit are configured by a cache memory configured based on the serial communication standard. Thereby, for the same reason as the invention of (3), high-speed processing is possible while reducing the number of physical communication lines between the inspection processing unit and the communication processing unit.

  (8) In the present invention, the efficiency of processing in the transmission flow control unit can be improved by specifying the transmission destination using the address included in the communication request.

  (9) In the present invention, the memory area of the communication request buffer is partitioned for each communication line, and the communication request is written in the memory area of the communication request buffer corresponding to the destination communication line. Thereby, even when a plurality of communication lines of different standards are provided in the vehicle, communication requests can be prevented from being concentrated on the same electronic control device, and as a result, the time required for inspection can be shortened. .

1 is a block diagram showing a hardware configuration of a vehicle inspection device and a vehicle according to a first embodiment of the present invention. It is a block diagram which shows the network structure between an inspection process part and a communication process part. It is a block diagram which shows the procedure of the flow control performed in a transmission flow control part. It is a time chart which shows an example of the flow of the communication request | requirement and communication result at the time of determining the quality of the some test | inspection item using the conventional vehicle inspection apparatus. It is a time chart which shows an example of the flow of the communication request | requirement at the time of determining the quality of a some test | inspection item using the vehicle inspection apparatus of the said embodiment, and a communication result. It is a block diagram which shows the procedure of the flow control performed in the transmission flow control part of the vehicle inspection apparatus which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the network structure between the inspection process part and communication process part in the vehicle inspection apparatus which concerns on 3rd Embodiment of this invention. It is a block diagram which shows the network structure between the inspection process part and communication process part in the vehicle inspection apparatus which concerns on 4th Embodiment of this invention. It is a figure which shows the structure of the conventional vehicle inspection apparatus and the vehicle to which this vehicle inspection apparatus is connected.

<First Embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a hardware configuration of a vehicle inspection apparatus 1 according to the present embodiment and a vehicle V as an inspection target of the vehicle inspection apparatus 1.

  A plurality of ECUs are mounted on the vehicle V. Each of these ECUs electronically controls a plurality of vehicle components (not shown) such as an engine, an exhaust purification device, and a sensor mounted on the vehicle V. In the vehicle V, the plurality of ECUs are connected via a communication line based on a predetermined communication standard (for example, CAN, K-Line, etc.), and can communicate with each other. Although FIG. 1 shows an example in which the first communication line L1, the second communication line L2, and the third communication line L3 are provided in the vehicle V, the present invention is not limited to this. The number of communication lines provided in the vehicle may be one or more.

  The plurality of ECUs mounted on the vehicle V are divided into a plurality of groups by the plurality of communication lines L1 to L3. More specifically, the plurality of ECUs include p ECUs 11, 12,..., 1p connected to the communication line L1, and q ECUs 21, 22,..., 2q connected to the communication line L2. , 3r connected to the communication line L3. Each communication line L1, L2, L3 can be connected to the vehicle inspection apparatus 1 via a connector C. This enables communication between the vehicle inspection apparatus 1 and a plurality of ECUs mounted on the vehicle V. In the following, it is assumed that the number of ECUs mounted on the vehicle V and connected to the vehicle inspection apparatus 1 so as to be communicable is n.

  The vehicle inspection device 1 is connected to a plurality of ECUs of the vehicle V via the connector C, transmits a communication request corresponding to the inspection item relating to the vehicle V to the ECU, and an inspection item based on a response to the communication request Judge whether or not The vehicle inspection apparatus 1 generates a communication request by executing a predetermined inspection program and determines whether or not the inspection item is acceptable, and communication between the inspection processing unit 2 and a plurality of ECUs of the vehicle V It is divided into a communication processing unit 3 as a network controller responsible for transmission / reception of requests and communication results.

  The inspection processing unit 2 includes a CPU (Central Processing Unit) 21, a storage device 22, an input device 23, an audio output device 24, a display device 25, and an external communication device 26.

  The CPU 21 executes various processes such as inspection of the vehicle V and communication between the inspection processing unit 2 and the communication processing unit 3 according to various programs stored in the storage device 22. The storage device 22 includes a storage medium such as a ROM, a RAM, a hard disk, and a DRAM, for example. The storage device 22 includes a plurality of inspection programs for the vehicle V, a program for realizing a network having a structure shown in FIGS. 2 and 3 to be described later between the inspection processing unit 2 and the communication processing unit 3, and the like. Various programs and data related to the execution of the inspection are stored.

  The input device 23 includes a plurality of buttons that receive instruction operations from the user. The external communication device 26 controls communication between the vehicle inspection device 1 and other devices via a network including the Internet. The external communication device 26 is used, for example, when a new inspection program is added to the storage device 22 or an existing inspection program is modified. The display device 25 displays guidance for prompting the user to operate the input device 23 when inspecting the vehicle V, the result of the inspection, and the like.

FIG. 2 is a block diagram illustrating a network configuration between the inspection processing unit 2 and the communication processing unit 3.
The inspection processing unit 2 includes an inspection control unit 51, a transmission flow control unit 52, a communication request transmission buffer 53, a communication request transmission unit 54, a communication result reception unit 55, and a hardware configuration as described above. A communication result reception buffer 56. The communication processing unit 3 includes a communication request receiving unit 61, a communication request receiving buffer 62, a communication result transmission buffer 63, a communication result transmission unit 64, and a vehicle communication unit 65. Hereinafter, functions of the modules configured in the inspection processing unit 2 and the communication processing unit 3 will be described in order.

First, the configuration on the inspection processing unit 2 side will be described.
The inspection control unit 51 selects m (m is an integer of 1 or more) inspection programs P1, P2,..., Pm corresponding to the model of the vehicle to be inspected from a plurality of predetermined inspection programs. The inspection programs P1 to Pm are selected and executed in a predetermined order. The order in which the m selected inspection programs P1 to Pm are executed is determined in advance according to the inspection contents or determined by the user. In the following, it is assumed that the inspection programs P1 to Pm are executed in order from the smallest number.

  Each of the inspection programs P1 to Pm is determined in accordance with an inspection item related to a specific ECU mounted on the vehicle or a specific vehicle part electronically controlled by the specific ECU. This inspection item evaluates whether the above-mentioned specific ECU or vehicle parts are functioning normally by good or bad. Each inspection program P1 to Pm defines a procedure for determining pass / fail of each inspection item. More specifically, each of the inspection programs P1 to Pm uses a procedure for generating a communication request according to the inspection item and a communication result that is a response from the vehicle to the generated communication request. And a procedure for judging pass / fail.

  The inspection control unit 51 determines the quality of the m inspection items by executing these inspection programs P1 to Pm. When a predetermined inspection program is executed by the inspection control unit 51, a communication request corresponding to the inspection item is generated first. This communication request includes an address for specifying an ECU that is a transmission destination, and a control command in which a command for the ECU of the transmission destination is described. The communication request generated by executing the inspection program is transmitted to the ECU specified by the address according to the procedure described later. The ECU that has received this communication request executes a process according to the control command, and transmits the result to the vehicle inspection apparatus 1 as a communication result. The inspection control unit 51 receives the communication result transmitted from the ECU and uses this to determine pass / fail of the inspection item. Thereby, one inspection program is completed. The inspection control unit 51 can execute a plurality of inspection programs as described above in parallel.

  Note that the number of communication requests and communication results transmitted and received between the vehicle inspection apparatus 1 and the vehicle V by executing one inspection program is not limited to one, and may be plural. That is, in one inspection program, by repeating the transmission of the communication request from the vehicle inspection apparatus 1 to the vehicle V and the transmission of the communication result from the vehicle V to the vehicle inspection apparatus 1 multiple times, the quality of one inspection item is determined. You may judge.

  The transmission flow control unit 52 acquires a plurality of communication requests generated by executing a plurality of inspection programs in the inspection control unit 51 in the order generated by the inspection control unit 51, and will be described with reference to FIG. By performing flow control, the order of a plurality of communication requests is optimized so that the inspection time by the vehicle inspection apparatus 1 is shortened, and then the plurality of communication requests are written in the communication request transmission buffer 53.

FIG. 3 is a block diagram illustrating a flow control procedure executed in the transmission flow control unit 52.
The transmission flow control unit 52 includes a request transmission destination registration unit 521, a communication request buffer 522, and a flow control unit 523.

  The communication request buffer 522 is a memory that temporarily stores a plurality of communication requests generated by the inspection control unit. As shown in FIG. 3, the memory area of the communication request buffer 522 is partitioned for each ECU mounted on the vehicle to be inspected. In the following, among the communication request buffers 522, memory areas partitioned according to the first, second,..., Nth ECUs are defined as a first buffer 522_1, a second buffer 522_2,. To do. Each of these buffers 522_1 to 522_n can store at least two communication requests. The buffers 522_1 to 522_n are so-called FIFO buffers that are output in the order of writing.

  In FIG. 3, the symbol “Cmdi_j_k” indicates a communication request. The subscript “i” means a communication request generated due to the execution of the “i” th inspection program. The subscript “j” means a communication request generated at the “j” th time in the inspection program. The subscript “k” means a communication request with the “k” -th ECU as a transmission destination.

  The plurality of buffers 522_1 to 522_n may be prepared in advance by the number of ECUs mounted on the vehicle before performing the inspection, or a plurality of inspection programs are selected by the inspection control unit 51. Depending on the situation, the ECUs may be prepared for the communication requests that can be transmitted by executing the plurality of inspection programs.

  When a new communication request is generated by the inspection control unit, the request transmission destination registration unit 521 specifies an ECU to which the communication request is to be transmitted by using an address included in the communication request, and this communication The request is written in a buffer that is partitioned according to the transmission destination ECU of the communication request buffer 522. That is, the request transmission destination registration unit 521 distributes and writes the communication request generated by the inspection control unit in the buffers 522_1 to 522_n corresponding to the addresses.

  The flow control unit 523 reads the communication request stored in the communication request buffer 522 in accordance with the scanning order defined in advance for each of the buffers 522_1 to 522_n and writes the communication request in the communication request transmission buffer 53. More specifically, as indicated by a thick arrow in FIG. 3, the flow control unit 523 is the first communication request stored in each of the buffers 522_1 to 522_n according to a predetermined scanning order (ie, The communication request written first in each of the buffers 522_1 to 522_n is read and written to the communication request buffer 53. 3 illustrates an example in which the first communication request is sequentially read from the buffer 522_1 to the buffer 522_n and then returned to the buffer 522_1 again. However, the scanning order is not limited to this example. As described above, in the present embodiment, by writing what has been read by the flow control unit 523 into the communication request transmission buffer 53, when the top communication request of each of the buffers 522_1 to 522_n is repeatedly scanned as described above, an error occurs. The same communication request is not read repeatedly.

  Further, the flow control unit 523 writes a communication request in the communication request transmission buffer 53 up to a capacity permitted in the communication request transmission buffer 53. Here, the capacity permitted in the communication request transmission buffer 53 is the capacity (so-called window size) that can be transmitted from the communication request transmission unit 54 described later to the communication processing unit 3, the inspection processing unit 2, and the communication processing unit 3. The smaller of the total amount of packet sizes that can be transmitted at one time in the data communication. The window size can be acquired by a known method such as a sliding window method.

  Returning to FIG. 2, the communication request transmission buffer 53 stores a plurality of communication requests output from the transmission flow control unit 52 through the flow control as described above. The communication request transmission buffer 53 is a FIFO buffer that outputs communication requests in the order written. The communication request transmission unit 54 reads the communication request stored in the communication request transmission buffer 53 and transmits it to the communication processing unit 3.

  The communication result receiving unit 55 receives the communication result transmitted from the communication processing unit 3 and writes the communication result in the communication result receiving buffer 56. The communication result reception buffer 56 is a FIFO buffer that outputs communication results in the order in which they are written. When the communication result corresponding to the currently executed inspection program is written in the communication result reception buffer 56, the inspection control unit 51 reads this communication result and determines the quality of the inspection item according to this inspection program or makes a new communication request. Is generated.

Next, the configuration on the communication processing unit 3 side will be described.
The communication request receiving unit 61 receives the communication request transmitted from the communication request transmitting unit 54 of the inspection processing unit 2 and writes it in the communication request receiving buffer 62. The communication request reception buffer 62 is a FIFO buffer that outputs communication requests in the order written.

  The communication result transmission unit 64 reads the communication result stored in the communication result transmission buffer 63 and transmits it to the communication result reception unit 55 of the inspection processing unit 2. The communication result transmission buffer 63 is a FIFO buffer that outputs communication results in the order written.

  The vehicle communication unit 65 performs processing related to transmission / reception of communication requests and communication results between the vehicle inspection apparatus 1 and the vehicle V. More specifically, the vehicle communication part 65 reads the communication request memorize | stored in the communication request reception buffer 62, and transmits this communication request to ECU of the transmission destination via a communication line. Thus, the plurality of communication requests generated by the inspection control unit 51 are transmitted to the vehicle V according to the order of transmission from the communication request transmission unit 54 after passing through the transmission flow control unit 52. Further, when the vehicle communication unit 65 receives a communication result from the ECU of the vehicle V via the communication line, the vehicle communication unit 65 writes the communication result in the communication result transmission buffer 63.

  The communication between the inspection processing unit 2 and the communication processing unit 3 configured as described above is preferably compliant with, for example, a serial communication standard (in particular, USB (Universal Serial Bus)). In this case, the communication request transmission buffer 53, the communication request reception buffer 62, the communication result reception buffer 56, and the communication result transmission buffer 63 are configured as a cache memory based on this serial communication standard.

Next, the effect of flow control on the communication request in the transmission flow control unit 52 described above will be described.
FIG. 4 is a time chart showing an example of a flow of a communication request and a communication result when determining the quality of a plurality of inspection items using a conventional vehicle inspection device.
FIG. 5 is a time chart showing an example of the flow of communication requests and communication results when the quality of the same number of inspection items is determined using the vehicle inspection apparatus of the present embodiment.
Here, the conventional vehicle inspection device refers to a device that does not perform the flow control as described above in response to a communication request, and the order in which a plurality of communication requests are generated in the inspection control unit from the inspection processing unit to the inspection control unit. That are sent in the same order.

  In the example of FIGS. 4 and 5, the number of inspection items to be determined (that is, the number of inspection programs to be executed) is four, and the total number of ECUs mounted on the vehicle is four. In addition, the number of communication requests that can be simultaneously processed in parallel by the communication processing unit (in other words, the number of communication requests that can be received by the communication processing unit) is two. The number of acceptable communication requests is determined according to the performance of the communication processing unit. Further, the communication processing unit issues a communication request so that the correspondence between the communication request transmitted from the vehicle inspection device to the ECU and the communication result transmitted from the ECU to the vehicle inspection device as a response to the communication request becomes clear. The transmission of the communication request to the same ECU was temporarily stopped until the communication result for the ECU was received after the transmission to the ECU.

  4 and 5 show a case where four inspection programs are executed in the order of P1, P2, P3, and P4. Moreover, each inspection program P1-P4 shall transmit / receive a communication request and a communication result twice each between a vehicle inspection apparatus and a vehicle. Further, between the inspection processing unit and the communication processing unit, the communication request and the communication result are periodically transmitted and received at a constant cycle by the serial communication described above.

  In FIGS. 4 and 5, the symbol “Resi_j_k” indicates a communication result. The subscript “i” means a communication result for a communication request generated due to the execution of the “i” -th inspection program. The subscript “j” means a communication result for the communication request generated at the “j” th time in the inspection program. The subscript “k” means a communication result with the “k” th ECU as the transmission source.

  First, FIG. 4 will be described. First, the four inspection programs P1 to P4 are executed in this order by the inspection control unit. Thereby, the first communication requests Cmd1_1_1, Cmd2_1_1, Cmd3_1_3, and Cmd4_1_4 corresponding to the inspection programs P1 to P4 are generated in this order. As shown in FIG. 4, in this example, two communication requests Cmd1_1_1 and Cmd2_1_1 directed to the first ECU among the four ECUs are generated in succession.

  Under conventional flow control, a communication request is transmitted from the inspection processing unit to the communication processing unit in the order generated within a range that does not exceed the number acceptable by the communication processing unit. Therefore, in the first communication cycle, only two communication requests Cmd1_1_1 and Cmd_2_1_1 among the four communication requests generated first are transmitted from the inspection processing unit to the communication processing unit. However, since these two communication requests Cmd1_1_1 and Cmd_2_1_1 are sent to the same first ECU, the communication processing unit cannot transmit the communication request Cmd2_1_1 until the response Res1_1_1 to the communication request Cmd1_1_1 is received. For this reason, only one ECU can be operated for inspection between the first and second communication cycles.

  In the second communication cycle, since the communication processing unit has not received a response to the previously transmitted communication request Cmd2_1_1, the number of communication requests that can be newly accepted at this time is only one. Therefore, the communication request Cmd3_1_3 can be newly transmitted to only one ECU between the second and third communication cycles.

  As described above, under the conventional flow control, when communication requests are concentrated toward the same ECU, a plurality of ECUs cannot be operated in parallel, and communication requests for other ECUs are accordingly increased. Transmission is delayed, and as a result, the number of times of communication performed between the inspection processing unit and the communication processing unit is increased until the four inspection programs are finished (in the example of FIG. 4, six cycles).

  Next, FIG. 5 will be described. First, the first communication requests Cmd1_1_1, Cmd2_1_1, Cmd3_1_3, and Cmd4_1_4 corresponding to the respective inspection programs P1 to P4 are generated in the same order as in FIG.

  Here, under the flow control shown in FIG. 3, the generated plurality of communication requests are written in a memory area partitioned for each ECU of the communication request buffer 522 by the request transmission destination registration unit 521. Then, the flow control unit 523 reads the communication request stored in the communication request buffer 522 in accordance with the scanning order determined for each ECU. Therefore, in the first communication cycle, two communication requests Cmd1_1_1 and Cmd3_1_3 are transmitted from the inspection processing unit to the communication processing unit. These two communication requests Cmd1_1_1 and Cmd3_1_3 are communication requests directed to the first ECU and the third ECU, respectively. Therefore, unlike the example of FIG. 4, the communication processing unit can transmit the communication request Cmd3_1_3 to the third ECU without waiting for the response Res1_1_1 to the communication request Cmd1_1_1. For this reason, two ECUs can be operated in parallel for the inspection between the first and second communication cycles.

  Also, for this reason, in the second communication cycle, the communication processing unit has already received responses to the two communication requests transmitted earlier, so the number of communication requests that can be newly accepted at this point is two. Become. Therefore, communication requests Cmd2_1_1 and Cmd4_1_4 can be newly transmitted to two different ECUs between the second and third communication cycles.

  As described above, even if communication requests are concentrated and generated toward the same ECU under the flow control of FIG. 3, the order of these communication requests is arranged so that a plurality of ECUs operate in parallel as much as possible. As a result, the number of communications performed between the inspection processing unit and the communication processing unit until the four inspection programs are ended as a result is smaller than that in the example of FIG. 4 (5 cycles in the example of FIG. 5). . Thereby, even when there are many inspection items for which pass / fail is determined, the time required for the inspection can be shortened.

Second Embodiment
Next, a vehicle inspection apparatus 1A according to a second embodiment of the present invention will be described with reference to the drawings. Below, a different code | symbol is attached | subjected about the structure different from the vehicle inspection apparatus 1 of 1st Embodiment, the same code | symbol is attached | subjected about the same structure, and the description is abbreviate | omitted.

FIG. 6 is a block diagram illustrating a flow control procedure executed in the transmission flow control unit 52A of the vehicle inspection apparatus 1A of the present embodiment. The vehicle inspection apparatus 1A of the present embodiment is different from the vehicle inspection apparatus 1 of the first embodiment in the configuration of the transmission flow control unit 52A.
The transmission flow control unit 52A includes a request transmission destination registration unit 521A, a communication request buffer 522A, and a flow control unit 523A.

  The communication request buffer 522A is a memory that temporarily stores a plurality of communication requests generated by the inspection control unit. As described with reference to FIG. 3, in the transmission flow control unit 52 of the first embodiment, the memory area of the communication request buffer 522 is partitioned for each ECU. In contrast, in the communication request buffer 522A of the present embodiment, the memory area is used without being divided for each ECU. When a new communication request is generated by the inspection control unit, the request transmission destination registration unit 521A writes the communication requests in the communication request buffer 522A in the order of generation.

  The flow control unit 523A selectively reads one of the plurality of communication requests stored in the communication request buffer 522A in an order so that the same transmission destination does not continue, and writes it to the communication request transmission buffer 53. More specifically, the flow control unit 523A determines a search order in advance for a plurality of ECUs that can be transmission destinations, and a communication request with the corresponding ECU as a transmission destination in accordance with the search order is a communication request buffer. It is determined using the address included in the communication request whether or not it exists in the plurality of communication requests stored in 522A. As a result of this determination, if there is a communication request with the corresponding ECU as the transmission destination, the flow control unit 523A reads one of the corresponding communication requests and writes it in the communication request buffer 53. Further, as a result of this determination, if there is no communication request with the corresponding ECU as the transmission destination, the flow control unit 523A decrements the search order by one, and a communication request with the corresponding ECU as the transmission destination again. It is determined whether or not the communication request buffer 522A exists. In this way, by searching the communication request buffer 522A by the flow control unit 523A, the communication requests can be selectively read and written in the communication request transmission buffer 53 in such an order that the same destinations do not continue. it can.

  According to the vehicle inspection apparatus 1A including the transmission flow control unit 52A as described above, the same effects as those of the vehicle inspection apparatus 1 of the first embodiment can be obtained.

<Third Embodiment>
Next, a vehicle inspection apparatus 1B according to a third embodiment of the present invention will be described with reference to the drawings. Below, a different code | symbol is attached | subjected about the structure different from the vehicle inspection apparatus 1 of 1st Embodiment, the same code | symbol is attached | subjected about the same structure, and the description is abbreviate | omitted.

  FIG. 7 is a block diagram illustrating a network configuration between the inspection processing unit 2B and the communication processing unit 3B in the vehicle inspection apparatus 1B according to the present embodiment. The vehicle inspection apparatus 1B of the present embodiment is different from the vehicle inspection apparatus 1 of the first embodiment in the configuration of the inspection processing unit 2B and the communication processing unit 3B. As described above, the vehicle V is provided with three communication lines L1 to L3, and p, q, and r ECUs are connected to the communication lines L1 to L3, respectively (see FIG. 1). ). The vehicle inspection apparatus 1B of the present embodiment is the first implementation in that a number of communication systems equal to the number of communication lines L1 to L3 provided in the vehicle V are provided between the inspection processing unit 2B and the communication processing unit 3B. It differs from the vehicle inspection apparatus 1 of a form.

  The inspection processing unit 2B includes an inspection control unit 51, a transmission flow control unit 52B, an integrated flow control unit 57B, a communication request transmission buffer 53, a communication request transmission unit 54, a communication result reception unit 55, and a communication result. A reception buffer 56.

  The transmission flow control unit 52B includes a first transmission flow control unit 52Ba provided corresponding to the first communication line, a second transmission flow control unit 52Bb provided corresponding to the second communication line, and a third communication. And a third transmission flow control unit 52Bc provided corresponding to the line. Each of the transmission flow control units 52Ba, 52Bb, and 52Bc includes a communication request buffer that is partitioned independently for each communication line. By performing the flow control described with reference to FIG. 3, the inspection control unit 51 has a function of optimizing the order of a plurality of communication requests.

  More specifically, the first transmission flow control unit 52Ba, among the plurality of communication requests generated by executing the plurality of inspection programs in the inspection control unit 51, the transmission destination ECU becomes the first communication line. Optimizes the order of multiple communication requests among those belonging to the first communication line by acquiring only those that are connected and performing the flow control described with reference to FIG. 3 for the acquired communication requests. To do.

  The second transmission flow control unit 52Bb performs the same flow control as the first transmission flow control unit 52Ba, so that the order of the plurality of communication requests generated in the inspection control unit 51 belongs to the second communication line. Optimize.

  The third transmission flow control unit 52Bc performs the same flow control as the first transmission flow control unit 52Ba, so that the order of the plurality of communication requests generated in the inspection control unit 51 belongs to the third communication line. Optimize.

  In addition, the flow control performed in each transmission flow control part 52Ba-52Bc is not restricted to what was demonstrated with reference to FIG. 3, For example, you may perform what was demonstrated with reference to FIG.

  The integrated flow control unit 57B reads a plurality of communication requests rearranged so as to be optimal for each communication line via any of the transmission flow control units 52Ba to 52Bc, and writes them into the communication request transmission buffer 53.

  The communication processing unit 3B includes a communication request reception unit 61, a communication request reception buffer 62, a reception flow control unit 66B, a communication result transmission buffer 63, a communication result transmission unit 64, and a vehicle communication unit 65B. Is done.

  The reception flow control unit 66B includes a separation flow control unit 661B, a first communication request reception buffer 662Ba provided corresponding to the first communication line, and a second communication request reception provided corresponding to the second communication line. A buffer 662Bb, and a third communication request reception buffer 662Bc provided corresponding to the third communication line.

  Each of these communication request reception buffers 662Ba to 662Bc is a FIFO buffer that outputs the communication requests in the order in which they are written, and stores a plurality of communication requests whose destination is the ECU connected to each communication line. The separation flow control unit 661B reads the communication request stored in the communication request reception buffer 62, specifies the communication line to which this communication request is to be transmitted by using the address included in this communication request, and executes this communication The request is written in the communication request reception buffers 662Ba to 662Bc corresponding to the specified communication line.

  The vehicle communication unit 65B includes a first communication unit 65Ba responsible for communication with the ECU connected to the first communication line, a second communication unit 65Bb responsible for communication with the ECU connected to the second communication line, and a third 3rd communication part 65Bc which bears communication with ECU connected to the communication line.

  The first communication unit 65Ba reads the communication request stored in the first communication request reception buffer 662Ba, and transmits this communication request to the destination ECU via the first communication line. Further, when the first communication unit 65Ba receives the communication result from the vehicle V via the first communication line, the first communication unit 65Ba writes the communication result in the communication result transmission buffer 63.

  The second communication unit 65Bb reads the communication request stored in the second communication request reception buffer 662Bb, and transmits this communication request to the destination ECU via the second communication line. In addition, when the second communication unit 65Bb receives a communication result from the vehicle V via the second communication line, the second communication unit 65Bb writes the communication result in the communication result transmission buffer 63.

  The third communication unit 65Bc reads the communication request stored in the third communication request reception buffer 662Bc, and transmits this communication request to the destination ECU via the third communication line. In addition, when the third communication unit 65Bc receives the communication result from the vehicle V via the third communication line, the third communication unit 65Bc writes the communication result in the communication result transmission buffer 63.

  According to the vehicle inspection apparatus 1B as described above, the following effects are obtained in addition to the effects of the vehicle inspection apparatus of the first or second embodiment. For example, according to the vehicle inspection apparatus 1B, transmission flow control units 52Ba to 52Bc are provided for each communication line, and flow control is performed to optimize the order of a plurality of communication requests for each communication line. Thereby, even when a plurality of communication lines of different standards are provided in the vehicle, communication requests can be prevented from being concentrated on the same ECU, and as a result, the time required for inspection can be shortened.

  In addition, according to the vehicle inspection apparatus 1B, the communication request reception buffer 62 is provided between the communication request reception unit 61 and the reception flow control unit 66B, and the communication request before the communication request sorting process in the reception flow control unit 66B is performed. By storing in the communication request reception buffer 62, the time restriction necessary for the sorting process in the reception flow control unit 66B can be relaxed.

<Fourth embodiment>
Next, a vehicle inspection apparatus 1C according to a third embodiment of the present invention will be described with reference to the drawings. Below, a different code | symbol is attached | subjected about the structure different from the vehicle inspection apparatus 1B of 3rd Embodiment, the same code | symbol is attached | subjected about the same structure, and the description is abbreviate | omitted.

  FIG. 8 is a block diagram illustrating a network configuration between the inspection processing unit 2C and the communication processing unit 3C in the vehicle inspection apparatus 1C according to the present embodiment. The inspection processing unit 2C according to the present embodiment further includes a reception flow control unit 58C with respect to the inspection processing unit 2B according to the third embodiment. Further, the communication processing unit 3C further includes a transmission flow control unit 67C with respect to the communication processing unit 3B of the third embodiment.

  The reception flow control unit 58C, the separation flow control unit 581C, the first communication result reception buffer 582Ca provided corresponding to the first communication line, and the second communication result reception provided corresponding to the second communication line. A buffer 582Cb, and a third communication result reception buffer 582Cc provided corresponding to the third communication line.

  Each of these communication result reception buffers 582Ca to 582Cc is a FIFO buffer that outputs the communication results in the order in which they are written, and stores a plurality of communication results with the ECU connected to each communication line as a transmission source. The separation flow control unit 581C reads the communication result stored in the communication result reception buffer 56, specifies the communication line that is the transmission source of this communication result, and uses this communication result as the communication result reception buffer corresponding to the specified communication line. Write to 582Ca, 582Cb, 582Cc.

  The transmission flow control unit 67C includes an integrated flow control unit 671C, a first communication result transmission buffer 672Ca provided corresponding to the first communication line, and a second communication result transmission provided corresponding to the second communication line. A buffer 672Cb, and a third communication result transmission buffer 672Cc provided corresponding to the third communication line.

  Each of these communication result transmission buffers 672Ca to 672Cc is a FIFO buffer that outputs the communication results in the order in which they are written, and stores a plurality of communication results having the ECU connected to each communication line as a transmission source. When the communication units 65Ba to 65Bc receive the communication results, the communication results are written in the communication result transmission buffers 672Ca to 672Cc. The integrated flow control unit 671C reads a plurality of communication results stored in the communication result transmission buffers 672Ca to 672Cc, and writes them into the communication result transmission buffer 63.

  According to the vehicle inspection apparatus 1C as described above, the following effects can be obtained in addition to the effects of the vehicle inspection apparatus 1B of the third embodiment. For example, according to the vehicle inspection apparatus 1C, the communication result reception buffer 56 is provided between the communication result receiving unit 55 and the reception flow control unit 58C, and the communication result before the communication result sorting process in the reception flow control unit 58C is performed. Is stored in the communication result reception buffer 56, the time restriction necessary for the sorting process in the reception flow control unit 58C can be relaxed.

  Moreover, according to the vehicle inspection apparatus 1C, the communication result transmission buffers 672Ca to 672Cc are provided for each communication line. Thereby, even if the communication result transmission buffer 63 temporarily exceeds the capacity, by recording the communication results in these communication result transmission buffers 672Ca to 672Cc, a part of the communication results can be inspected. It can be prevented from being transmitted to 2C.

  It should be noted that the present invention is not limited to the above-described embodiment, but includes modifications and improvements as long as the object of the present invention can be achieved.

1, 1A, 1B, 1C ... Vehicle inspection device 2, 2B, 2C ... Inspection processing unit 3, 3B, 3C ... Communication processing unit 51 ... Inspection control unit 52, 52A, 52B ... Transmission flow control unit 52Ba, 52Bb, 52Bc ... Transmission flow control unit 521 ... Request transmission destination registration unit 522 ... Communication request buffer 522_1 to 522_n ... Buffer 523 ... Flow control unit 53 ... Communication request transmission buffer 54 ... Communication request transmission unit 61 ... Communication request reception unit 62 ... Communication request reception buffer 65, 65B ... Vehicle communication unit V ... Vehicle L1, L2, L3 ... Communication line

Claims (9)

An inspection processing unit that generates a communication request for a plurality of electronic control devices mounted on the vehicle by executing an inspection program determined according to an inspection item related to the vehicle;
A communication processing unit connected to the plurality of electronic control devices and transmitting a communication request generated by the inspection processing unit to an electronic control device that is a transmission destination of the communication request, and based on a response from the vehicle to the communication request Vehicle inspection device for determining pass / fail of the inspection item,
The inspection processing unit
An inspection control unit that generates a communication request by executing the inspection program;
A communication request buffer for storing a plurality of the communication requests, and writing the communication request generated by the inspection control unit in a memory area partitioned for each electronic control device to which the communication request is transmitted in the communication request buffer A transmission flow control unit that reads a communication request stored in the communication request buffer according to a scanning order defined in advance for each memory area;
A communication request transmission unit that transmits the communication request read by the transmission flow control unit to the communication processing unit,
The vehicle processing apparatus, wherein the communication processing unit transmits the communication request to the vehicle according to an order transmitted from the communication request transmission unit. The transmission flow control unit
The communication request buffer;
When a communication request is generated by the inspection control unit, a request transmission destination registration unit that identifies a transmission destination of the communication request and writes the communication request in a memory area corresponding to the identified transmission destination of the communication request buffer; ,
The vehicle inspection apparatus according to claim 1, further comprising: a flow control unit that reads communication requests stored in each memory area of the communication request buffer according to the scanning order. The inspection processing unit includes a communication request transmission buffer for storing a communication request read by the transmission flow control unit,
The communication request transmission unit transmits the communication request stored in the communication request transmission buffer to the communication processing unit;
The communication processing unit
A communication request receiver that receives a communication request transmitted from the communication request transmitter;
A communication request receiving buffer in which a communication request received by the communication request receiving unit is written;
A vehicle communication unit that transmits the communication request stored in the communication request reception buffer to the electronic control device of the transmission destination,
The vehicle inspection device according to claim 1, wherein each of the communication request transmission buffer and the communication request reception buffer is a cache memory configured based on a predetermined serial communication standard. The communication request includes an address for specifying one of a plurality of electronic control devices mounted on a vehicle to be inspected, and a control command for the electronic control device specified by the address,
The vehicle inspection apparatus according to claim 1, wherein the transmission flow control unit specifies a transmission destination using an address included in the communication request. The vehicle includes a plurality of communication lines with different standards,
The memory area of the communication request buffer is partitioned for each of the electronic control device and the communication line,
When a communication request is generated by the inspection control unit, the transmission flow control unit is configured to store the communication request in a memory area partitioned for each electronic control device to which the communication request is transmitted and a communication line in the communication request buffer. 5. The vehicle inspection device according to claim 1, wherein the vehicle inspection device is written. An inspection processing unit that generates a communication request for a plurality of electronic control devices mounted on the vehicle by executing an inspection program determined according to an inspection item related to the vehicle;
A communication processing unit connected to the plurality of electronic control devices and transmitting a communication request generated by the inspection processing unit to an electronic control device that is a transmission destination of the communication request, and based on a response from the vehicle to the communication request Vehicle inspection device for determining pass / fail of the inspection item,
The inspection processing unit
An inspection control unit that generates a communication request by executing the inspection program;
A communication request buffer for storing a plurality of the communication requests, writing the communication request generated by the inspection control unit in the communication request buffer, and one of the plurality of communication requests written in the communication request buffer, A transmission flow control unit that selectively reads in an order in which the same destination does not continue,
A communication request transmission unit that transmits the communication request read by the transmission flow control unit to the communication processing unit,
The vehicle processing apparatus, wherein the communication processing unit transmits the communication request to the vehicle according to an order transmitted from the communication request transmission unit. The inspection processing unit includes a communication request transmission buffer for storing a communication request read by the transmission flow control unit,
The communication request transmission unit transmits the communication request stored in the communication request transmission buffer to the communication processing unit;
The communication processing unit
A communication request receiver that receives a communication request transmitted from the communication request transmitter;
A communication request receiving buffer in which a communication request received by the communication request receiving unit is written;
A vehicle communication unit that transmits the communication request stored in the communication request reception buffer to the electronic control device of the transmission destination,
The vehicle inspection apparatus according to claim 6, wherein each of the communication request transmission buffer and the communication request reception buffer is a cache memory configured based on a predetermined serial communication standard. The communication request includes an address for specifying one of a plurality of electronic control devices mounted on a vehicle to be inspected, and a control command for the electronic control device specified by the address,
The vehicle inspection apparatus according to claim 6, wherein the transmission flow control unit specifies a transmission destination using an address included in the communication request. The vehicle includes a plurality of communication lines with different standards,
The memory area of the communication request buffer is partitioned for each communication line,
The transmission flow control unit, when a communication request is generated by the inspection control unit, writes the communication request in a memory area partitioned for each communication line to which the communication request is transmitted in the communication request buffer. The vehicle inspection device according to any one of claims 6 to 8.

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