JP3969130B2 - Vehicle data recorder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle data recorder that records various types of information included in a plurality of in-vehicle electronic control devices installed in a vehicle.
[0002]
[Prior art]
Conventionally, there is a vehicle data recorder that records data of an electronic control device mounted on a vehicle. The vehicle data recorder includes a ring buffer memory inside. This ring buffer memory uses the recording area cyclically, and can store a certain amount of input data every time.
[0003]
The vehicle data recorder also includes a non-volatile memory, and when receiving a signal for informing a predetermined storage start condition to be described later, data of a predetermined time width including the time when the storage start condition is stored in the ring buffer memory. Store in non-volatile memory.
[0004]
FIG. 2 shows an example in which a vehicle data recorder 200A is connected to a vehicle 100A including a plurality of on-vehicle electronic control devices.
In-vehicle electronic control devices 111A, 112A, and 113A are provided in vehicle 100A, and sensors 111B, 112B, and 113B that are used for control by each in-vehicle electronic control device and actuators that are driven based on information from each sensor 111C, 112C, and 113C are connected.
[0005]
The in-vehicle electronic control devices 111A, 112A, and 113A are connected to the control system multiplex communication bus 104, respectively. Control system multiplex communication bus 104 is connected to vehicle data recorder 200 </ b> A via connector 120. The on-vehicle electronic control devices 111A, 112A, and 113A are connected to the diagnostic communication bus 105 and connected to the vehicle data recorder 200A via the connector 120.
[0006]
Each on-vehicle electronic control device 111A, 112A, 113A communicates control information (sensor value) from the sensors 111B, 112B, 113B connected to the vehicle-mounted electronic control device 111A, 112A, 113A by the broadcast system through the control system multiplex communication bus 104, and controls We are exchanging. Each in-vehicle electronic control device controls the connected actuator using control information from the sensor connected to itself and control information from another in-vehicle electronic control device input through the control system multiplex communication bus 104. I do.
[0007]
The ring buffer memory 201, the non-volatile memory 202, and the storage start condition determination unit 203 provided in the vehicle data recorder 200A are communicated to the control system multiplex communication bus 104 via the control system multiplex communication interface (I / F) 204. Is connected to the diagnostic communication bus 105 via an interface (I / F) 205.
[0008]
The vehicle data recorder 200 </ b> A can obtain control information from each of the on-vehicle electronic control devices 111 </ b> A, 112 </ b> A, 113 </ b> A through the control system multiplex communication bus 104 every time. The vehicle data recorder 200A performs diagnostic communication with a predetermined electronic control device set in advance among the on-vehicle electronic control devices 111A, 112A, and 113A via the diagnostic communication bus 105. Specific information such as the control information held and the self-diagnosis execution result performed in response to a request from the vehicle data recorder 200A can be obtained.
[0009]
Specific information transmitted to the vehicle data recorder 200A via the diagnostic communication bus 105 includes, for example, a preset sensor value of a predetermined in-vehicle electronic control device 111A, a self-diagnosis execution result, and the like. In the diagnostic communication performed using the diagnostic communication bus 105, data exchange is performed by one-to-one communication between a predetermined vehicle-mounted electronic control device set in advance and the vehicle data recorder 200A.
The ring buffer memory 201 receives control information from each on-vehicle electronic control device input through the control system multiplex communication bus 104 and unique information from a predetermined preset on-vehicle electronic control device input through the diagnostic communication bus 105. Remember every moment.
[0010]
The storage start condition determination unit 203 constantly monitors control information and unique information input to the vehicle data recorder 200A. When a data abnormality occurs in the control information or the unique information and the storage start condition determination unit 203 determines that the storage start condition is satisfied, the vehicle data recorder 200A determines the storage start condition stored in the ring buffer memory 201 and The control information and the specific information having a predetermined time width including the point in time are stored in the nonvolatile memory 202.
[0011]
FIG. 3 shows data stored in the nonvolatile memory by the vehicle data recorder.
The ring buffer memory 201 receives the control information of each in-vehicle electronic control device and the unique information of a predetermined in-vehicle electronic control device set in advance and stores it as data A every time. At time t1, the storage start condition determining unit 203 detects an abnormality in the control information or unique information transmitted by the predetermined on-vehicle electronic control device, and determines that the predetermined storage start condition is satisfied.
[0012]
Here, a time before the predetermined time T10 from the time t1 is set as a time t0, and a time after the predetermined time T21 from the time t1 is set as a time t2.
When the storage start condition is satisfied, the vehicle data recorder 200A stores, in the nonvolatile memory 202, the data X stored in the ring buffer memory 201 from time t0 to time t2, including the time t1 when the abnormality of the received control information occurs. .
[0013]
As described above, when the storage start condition determination unit 203 determines that the storage start condition is satisfied because an abnormality has occurred in the control information or unique information transmitted by a predetermined vehicle-mounted electronic control device, the ring Control information and specific information of a predetermined time width including the time point when the abnormality stored in the buffer memory 201 occurs is stored in the nonvolatile memory 202. By analyzing the cause of the occurrence of the abnormality based on the stored data before and after the occurrence of the abnormality, it can be used for elucidating the cause of the non-reproduction trouble.
[0014]
[Problems to be solved by the invention]
In such a conventional method, since the vehicle-mounted electronic control device that performs diagnostic communication with the vehicle data recorder 200A using the diagnostic communication bus 105 is determined in advance, other than the vehicle-mounted electronic control device that performs diagnostic communication. When an abnormality is detected in the control information transmitted from the in-vehicle electronic control device, there is a problem that the vehicle data recorder 200A cannot obtain the unique information of the in-vehicle electronic control device that has transmitted the abnormal control information. It was.
[0015]
Therefore, in view of such a conventional problem, the present invention provides an in-vehicle electronic control device even when an abnormality is detected in control information transmitted by the in-vehicle electronic control device other than the in-vehicle electronic control device performing diagnostic communication. An object of the present invention is to provide a vehicle data recorder capable of recording unique information possessed by.
[0016]
[Means for Solving the Problems]
According to the first aspect of the present invention, a plurality of in-vehicle electronic control devices are connected to the first communication bus, and control information of the plurality of in-vehicle electronic control devices is transmitted between the in-vehicle electronic control devices through the first communication bus. In a vehicle data recorder configured to record information transmitted from a plurality of in-vehicle electronic control devices, connected to the first communication bus, input control information through the first communication bus, and input control information An abnormality detecting means for detecting an abnormality of the in-vehicle electronic control device, a diagnostic communication means for performing diagnostic communication with the in-vehicle electronic control device and inputting unique information possessed by the in-vehicle electronic control device, and an input from the in-vehicle electronic control device Recording means for recording information, and when an abnormality is detected in the control information input from the on-vehicle electronic control device by the abnormality detection means, an abnormality is detected among the plurality of on-vehicle electronic control devices. It has been subjected to diagnostic communication by the in-vehicle electronic control unit and diagnostic communication means, recording means and shall be recorded unique information inputted by diagnostic communication means.
[0017]
The invention according to claim 2 is provided with an abnormality prediction means for predicting the occurrence of an abnormality of the in-vehicle electronic control device from the control information input through the first communication bus, and the occurrence of the abnormality is predicted by the abnormality prediction means. The diagnostic communication means performs diagnostic communication with the in-vehicle electronic control device in which the occurrence of an abnormality is predicted, and the recording means records unique information input by the diagnostic communication means from the time when the occurrence of the abnormality is predicted It was.
[0018]
According to the third aspect of the present invention, when an abnormality is detected by the abnormality detection means in the other vehicle-mounted electronic control device during diagnostic communication with the vehicle-mounted electronic control device, or another vehicle-mounted electronic control is performed by the abnormality prediction means. When an abnormality is predicted in the device, the diagnostic communication means stops the diagnostic communication with the on-vehicle electronic control device that is currently performing the diagnostic communication, and another on-vehicle electronic control device in which the abnormality is detected, or an abnormality is predicted. Diagnostic communication was performed with other on-vehicle electronic control devices.
[0019]
According to a fourth aspect of the present invention, a plurality of in-vehicle electronic control devices are connected to the second communication bus, and diagnostic communication is performed through the second communication bus.
According to a fifth aspect of the present invention, when the recording means records the unique information of the in-vehicle electronic control device, the control information of the predetermined in-vehicle electronic control device is recorded at the same time.
[0020]
According to the sixth aspect of the present invention, when the abnormality predicting means predicts the occurrence of abnormality of the in-vehicle electronic control device from the input control information, and the diagnostic communication means is performing diagnostic communication with the in-vehicle electronic control device. The abnormality detection means monitors the unique information of the in-vehicle electronic control device that performs diagnostic communication, and records the unique information by the recording means when an abnormality is detected.
[0021]
The invention according to claim 7 includes sub-recording means for temporarily recording information inputted from the on-vehicle electronic control device, and the sub-recording means records information inputted from each on-vehicle electronic control device every time. If an abnormality is detected by the abnormality detection means, the control information of a predetermined time width including the time point when the abnormality recorded in the sub-recording means is detected, and the vehicle in which the abnormality occurred before the abnormality occurred When performing diagnostic communication with the electronic control unit, specific information having a predetermined time width including the time point when the abnormality is detected and input from the in-vehicle electronic control unit in which the abnormality has occurred is recorded. It was recorded on the recording means.
In the invention described in claim 8, the recording means can start recording of control information and unique information of the in-vehicle electronic control device by an external recording switch provided outside.
[0022]
【The invention's effect】
According to the first aspect of the present invention, when an abnormality is detected by the abnormality detecting means, diagnostic communication is performed with the in-vehicle electronic control device in which the abnormality is detected, and the unique information of the in-vehicle electronic control device is recorded by the recording means. Since it records, the specific information of the vehicle-mounted electronic control apparatus in which abnormality occurred can be recorded reliably.
[0023]
According to the second aspect of the present invention, when an abnormality of the in-vehicle electronic control device is predicted by the abnormality predicting means, diagnostic communication is performed with the in-vehicle electronic control device in which the occurrence of the abnormality is predicted, and the abnormality is predicted. Since the unique information input by the diagnostic communication means from the time point is recorded, the unique information at the time point when the abnormality occurs can be recorded before the abnormality occurs.
[0024]
According to the third aspect of the present invention, when an abnormality is detected in the other vehicle-mounted electronic control device by the abnormality detection means or an abnormality is predicted while performing diagnostic communication with the vehicle-mounted electronic control device. An in-vehicle electronic control device in which an abnormality has occurred or an abnormality has been predicted by stopping communication with the on-vehicle electronic control device that is currently performing diagnostic communication and performing diagnostic communication with another on-vehicle electronic control device Information can be reliably recorded by the recording means.
[0025]
According to the invention of claim 4, each on-vehicle electronic control device is connected to the second communication bus, and diagnostic communication is performed through the second communication bus, so that the first communication bus is connected to each on-vehicle electronic control device. Diagnostic communication can be performed using the second communication line even in a high load state due to the concentration of control information transmitted by the device, so that a large amount of unique information can be recorded in the recording means. .
[0026]
According to the fifth aspect of the present invention, when recording the specific information of the in-vehicle electronic control device in which an abnormality has occurred or the abnormality is predicted, the recording unit simultaneously records the control information of the other in-vehicle electronic control device. Therefore, both control information and unique information can be recorded by the recording means.
[0027]
According to the invention described in claim 6, when abnormality occurs in the unique information transmitted by the in-vehicle electronic control device, the unique information is recorded by the recording means, so that only the unique information is displayed without any abnormality in the control information. Even when an abnormality is recognized in the recording means, the unique information can be recorded in the recording means.
[0028]
According to the seventh aspect of the present invention, the control information and the unique information transmitted from each in-vehicle electronic control device is temporarily recorded by the sub-recording means temporarily, so that the control information or the unique information transmitted by the in-vehicle electronic control device is recorded. When an abnormality is detected in the information, control information and unique information before the abnormality is detected can be recorded in the recording means.
According to the eighth aspect of the present invention, the control information and unique information of the on-vehicle electronic control device can be recorded at any timing by the operator by causing the recording means to record the information on the on-vehicle electronic control device by an external recording switch provided outside. Can be recorded.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment of the present invention.
The vehicle 100 includes in-vehicle electronic control devices 111A, 112A, and 113A. Each on-vehicle electronic control device is connected to a control system multiplex communication bus 104 and a diagnostic communication bus 105, respectively. Vehicle data recorder 200 is connected to control system multiplex communication bus 104 and diagnostic communication bus 105 via connector 120 provided in vehicle 100.
[0030]
The control multiplex communication bus 104 communicates by the broadcast method. On the other hand, the diagnostic communication bus 105 performs diagnostic communication individually with each on-vehicle electronic control device, and a predetermined on-vehicle electronic control device set by a method described later and the vehicle data recorder 200 perform diagnostic communication. .
The internal configuration of the vehicle 100 is the same as that of the above-described conventional example except that the diagnostic communication bus 105 is connected to each of the vehicle-mounted electronic control devices 111A, 112A, and 113A, and the description thereof is omitted.
[0031]
Next, the configuration of the vehicle data recorder 200 will be described.
The vehicle data recorder 200 includes a control system multiplex communication interface 204 and a diagnosis communication interface 205, which are connected to the control system multiplex communication bus 104 and the diagnosis communication bus 105 via the connector 120, respectively. Thereby, the vehicle data recorder 200 is transmitted from the control information transmitted from each of the in-vehicle electronic control devices 111A, 112A, and 113A and the predetermined in-vehicle electronic control device according to the situation among the in-vehicle electronic control devices 111A, 112A, and 113A. Specific information can be received. The control system multiplex communication interface 204 and the diagnostic communication interface 205 are controlled by a communication interface (I / F) control unit 208.
[0032]
The vehicle data recorder 200 is connected in advance to an external device 213 (for example, a PC) via an external communication interface (I / F) 212, and various conditions for recording data according to instructions from the external device 213 include recording conditions. It is set in the recording unit 207. The external communication interface 212 is also used when data stored in the nonvolatile memory 202 is transmitted to the external device 213.
[0033]
The control information input via the control system multiplex communication interface 204 and the specific information input via the diagnostic communication interface 205 are selected by the data recording control unit 209 and the data selected by the ring buffer memory 201 are selected. Is memorized cyclically. The data selection of the control information and unique information performed by the data recording control unit 209 is performed based on the conditions of the recording data set in the recording condition recording unit 207.
[0034]
The storage start condition determination unit 203 monitors whether the received control information and unique information have any data abnormality, and determines whether to store the data in the ring buffer memory 201 in the nonvolatile memory 202. This determination is made based on the conditions set in the recording condition recording unit 207.
[0035]
When the storage start condition determination unit 203 determines that the storage start condition is satisfied, the control information and unique information stored in the ring buffer memory 201 are stored in the nonvolatile memory 202 by the data recording control unit 209. By storing the control information and the unique information in the nonvolatile memory 202, the data can be reliably held.
[0036]
The in-vehicle electronic control device in which an abnormality occurs next from the control information received via the control system multiplex communication interface 204 or the unique information received via the diagnostic communication interface 205 by the diagnostic communication switching condition determination unit 206. Predict and determine whether to switch the on-vehicle electronic control device that performs diagnostic communication with the vehicle data recorder 200.
[0037]
The vehicle data recorder 200 includes a recording switch interface (I / F) 210 and is connected to an external recording switch (SW) 211 provided outside. The external recording switch 211 is a switch for the operator to manually store control information and unique information stored in the ring buffer memory 201 in the nonvolatile memory 202. When the external recording switch 211 is turned on, a storage start instruction signal is transmitted to the storage start condition determining unit 203 via the recording switch interface 210, and control information and unique information are stored in the nonvolatile memory 202.
[0038]
The operation of the vehicle data recorder in the present embodiment will be described.
First, a case where the control information and the unique information stored in the ring buffer memory are stored in the nonvolatile memory without switching the on-vehicle electronic control device that performs the diagnostic communication will be described.
For example, when the vehicle data recorder 200 is connected to the vehicle 100, the in-vehicle electronic control device 111A is set as the in-vehicle electronic control device that performs diagnostic communication first, and the control information transmitted from the in-vehicle electronic control device 111A is set. This is a case where an abnormality is detected and the storage start condition is satisfied.
[0039]
The vehicle data recorder 200 is connected in advance to the external device 213 via the external communication interface 212, and in accordance with an instruction from the external device 213, data recording conditions (vehicle electronic control device that performs diagnostic communication first, recording data, diagnostic communication switching) Conditions, storage start conditions, etc.) are set in the recording condition recording unit 207.
[0040]
Vehicle data recorder 200 is connected to vehicle 100 via connector 120. Since the control system multiplex communication bus 104 performs communication by the broadcast method, the vehicle data recorder 200 is transmitted from each of the in-vehicle electronic control devices 111A, 112A, and 113A when the vehicle data recorder 200 is connected to the vehicle 100. Control information can be received via the control system multiplex communication interface 204. Note that the control information received here is defined under preset recording conditions, and it is possible to receive only specific control information or all control information depending on the judgment of the data recording control unit 209. Is possible.
[0041]
At the same time, the vehicle data recorder 200 is also connected to the diagnostic communication bus 105 in the vehicle 100 via the diagnostic communication interface 205. Based on the conditions set in the recording condition recording unit 207, the communication interface control unit 208 requests necessary unique information from the first in-vehicle electronic control unit 111A that performs diagnostic communication. The in-vehicle electronic control device 111 </ b> A sends the unique information requested from the communication interface control unit 208 onto the diagnostic communication bus 105.
The ring buffer memory 201 stores the control information and unique information received from the control-system multiplex communication bus 104 and the diagnostic communication bus 105 one after another.
[0042]
When the control information sent to the control multiplex communication bus 104 by the in-vehicle electronic control device 111A or the unique information sent to the diagnostic communication bus 105 is determined by the storage start condition determination unit 203 to match the storage start condition, or When the external recording switch 211 is turned on by an operator's operation and a storage start instruction signal is input via the external communication interface 212, the data recording control unit 209 controls the control information stored in the ring buffer memory 201 and the unique information. Based on the information, data of a predetermined time width including the time when the storage start condition is satisfied is stored in the nonvolatile memory 202.
[0043]
The predetermined time interval before and after the storage start condition is satisfied is determined based on the value set in the recording condition recording unit 207.
After the storage of data in the nonvolatile memory 202 is completed, the stored data is transmitted to the external device 213 via the external communication interface 212 by the operation of the operator, and is used as data for analyzing the cause of abnormality.
[0044]
Next, a case will be described in which switching of the in-vehicle electronic control device that performs diagnostic communication is performed simultaneously with the establishment of the storage start condition, and the unique information from the in-vehicle electronic control device after switching is stored in the nonvolatile memory.
In a state where the vehicle data recorder 200 is performing diagnostic communication with the in-vehicle electronic control device 111A initially set in the recording condition recording unit 207, the control information transmitted by the in-vehicle electronic control device 112A to the control system multiplex communication bus 104 is Assume that the storage start condition determination unit 203 determines that the storage start condition is met.
[0045]
When the storage start condition is satisfied, the data recording control unit 209 stores, in the nonvolatile memory 202, control information having a predetermined time width including the time when the storage condition is stored, which is stored in the ring buffer memory 201. At the same time, the communication interface control unit 208 stops diagnostic communication with the in-vehicle electronic control device 111A, newly starts diagnostic communication with the in-vehicle electronic control device 112A, and requests necessary unique information.
[0046]
When the vehicle data recorder 200 receives the unique information transmitted from the in-vehicle electronic control unit 112A through the diagnostic communication, the vehicle data recorder 200 stores the unique information having a predetermined time width in the nonvolatile memory 202 from the time when the storage start condition is satisfied.
The unique information requested to the in-vehicle electronic control device 112A through the diagnostic communication is performed based on the recording conditions set in advance in the recording condition recording unit 207.
[0047]
As a result of the above operation, the vehicle data recorder 200 has received the control information of each on-vehicle electronic control device for a predetermined time width including the time when the storage condition is satisfied from the control system multiplex communication bus 104, and an abnormality has occurred from the diagnostic communication bus 105. The unique information having a predetermined time width can be received from the time when the storage start condition is transmitted, which is transmitted from the in-vehicle electronic control device, and can be stored in the nonvolatile memory 202.
[0048]
After the data storage in the nonvolatile memory 202 is completed, the control information and unique information stored in the nonvolatile memory 202 are transmitted to the external device 213 via the external communication interface 212 by the operator's operation, and as abnormality cause analysis data, etc. used.
[0049]
Furthermore, the case where switching of the vehicle-mounted electronic control apparatus which performs diagnostic communication is performed before the storage start condition is satisfied, and the data of the ring buffer memory is stored in the nonvolatile memory is shown.
It is assumed that the vehicle data recorder 200 is in a state of performing diagnostic communication with the in-vehicle electronic control device 111A.
[0050]
There is no data abnormality in the control information transmitted to the control system multiplex communication bus 104 by the in-vehicle electronic control device 112A, and it does not match the storage start condition determined by the storage start condition determination unit 203, but an abnormality may occur in the control information. The diagnostic communication switching condition determining unit 206 determines that the diagnostic communication switching condition is met. When the diagnostic communication switching condition is met, the communication interface control unit 208 switches the in-vehicle electronic control device that performs diagnostic communication from the in-vehicle electronic control device 111A to the in-vehicle electronic control device 112A.
[0051]
At this time, the unique information input to the vehicle data recorder 200 through the diagnostic communication bus 105 by the diagnostic communication is always stored in the ring buffer memory 201, and thus transmitted from the in-vehicle electronic control unit 112A stored in the ring buffer memory 201. A flag is set in the first unique information so that unique information between the in-vehicle electronic control device 111A and the in-vehicle electronic control device 112A that have been performing diagnostic communication before can be distinguished.
[0052]
For example, it is assumed that the engine water temperature data transmitted from the in-vehicle electronic control unit 112A is set to Y, the diagnosis communication switching condition is set to 90 ° C. <Y, and the storage start condition to the nonvolatile memory 202 is set to 100 ° C. <Y.
[0053]
When the vehicle data recorder 200 is performing diagnostic communication with the in-vehicle electronic control unit 111A, if the water temperature data Y from the in-vehicle electronic control unit 112A transmitted through the control system multiple communication bus 104 exceeds 90 ° C., the diagnostic communication is switched. The condition determination unit 206 determines that the diagnostic communication switching condition is satisfied.
[0054]
When the diagnostic communication switching condition is satisfied, the communication interface control unit 208 stops diagnostic communication with the in-vehicle electronic control device 111A and starts diagnostic communication with the in-vehicle electronic control device 112A. The ring buffer memory 201 stores control information received via the control system multiplex communication bus 104 and unique information of the in-vehicle electronic control unit 112A received via the diagnostic communication bus 105. Thereafter, when the water temperature data y exceeds 100 ° C., the storage start condition determination unit 203 determines that the storage start condition is satisfied.
[0055]
When the storage start condition is satisfied, the control information transmitted from each in-vehicle electronic control device having a predetermined time width including the time when the storage start condition stored in the ring buffer memory 201 is satisfied, and the in-vehicle electronic control device 112A are transmitted. The unique information is stored in the nonvolatile memory 202.
[0056]
In this way, the diagnosis communication switching condition is set, the vehicle-mounted electronic control device 112A that is likely to transmit the next abnormal data is predicted, and the diagnosis communication with the vehicle-mounted electronic control device 112A is performed in advance before the storage start condition is satisfied. Thus, the unique information of the in-vehicle electronic control device 112A before the storage start condition important for the cause analysis of the abnormality is established can be stored in the nonvolatile memory 202.
[0057]
In this embodiment, the control system multiplex communication bus 104 constitutes a first communication bus, and the diagnostic communication bus 105 constitutes a second communication bus. The ring buffer memory 201 constitutes a sub-recording unit, the non-volatile memory 202 constitutes a recording unit, and the storage start condition determination unit 203 constitutes an abnormality detection unit. Further, the diagnostic communication switching condition determination unit 206 constitutes an abnormality prediction unit, and the communication interface control unit 208 constitutes a diagnostic communication unit.
[0058]
The present embodiment is configured as described above, and when performing a diagnostic communication with the in-vehicle electronic control device that has been initially set, if the storage start condition is satisfied in the in-vehicle electronic control device that has been initially set, the storage start condition The unique information by the diagnostic communication having a predetermined time width including the time of establishment can be stored in the nonvolatile memory 202.
[0059]
In addition, when the storage start condition is satisfied in the in-vehicle electronic control device other than the in-vehicle electronic control device performing the diagnostic communication, the in-vehicle electronic control in which the vehicle data recorder 200 performs the diagnostic communication in the in-vehicle electronic control device in which the storage start condition is satisfied. By switching the devices, unique information by diagnostic communication of a predetermined time width can be stored in the nonvolatile memory 202 from the time when the storage start condition is satisfied.
[0060]
Further, when the diagnostic communication switching condition is satisfied in the in-vehicle electronic control device other than the in-vehicle electronic control device performing the diagnostic communication, the in-vehicle data recorder 200 performs the diagnostic communication in the in-vehicle electronic control device in which the diagnostic communication switching condition is satisfied. The electronic control unit is switched, and unique information by diagnostic communication is stored in the ring buffer memory 201. Thereafter, when the storage start condition is satisfied in the in-vehicle electronic control device that performs diagnostic communication, the unique information stored in the ring buffer memory 201 having a predetermined time width including the time when the storage start condition is satisfied is stored in the nonvolatile memory 202.
[0061]
That is, the occurrence of an abnormality in the in-vehicle electronic control device in which an abnormality has occurred by predicting the next in-vehicle electronic control device that is most likely to cause an abnormality from the control information transmitted from the in-vehicle electronic control device and performing diagnostic communication in advance The previous unique information can be stored in the nonvolatile memory 202.
As described above, by storing the unique information of the in-vehicle electronic control device in which an abnormality has occurred in the nonvolatile memory 202, it is possible to efficiently perform the cause analysis of the in-vehicle electronic control device.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of the present invention.
FIG. 2 is a diagram showing a configuration of a conventional vehicle data recorder.
FIG. 3 is a diagram showing data stored in a non-volatile memory from a ring buffer memory.
[Explanation of symbols]
100, 100A vehicle
104 Control system multiplex communication bus
105 Diagnostic communication bus
111A, 112A, 113A In-vehicle electronic control device
200, 200A Vehicle data recorder
201 Ring buffer memory
202 Nonvolatile memory
203 Storage start condition determination unit
206 Diagnostic communication switching condition determination unit
207 Recording condition recording section
208 Communication interface controller
209 Data recording controller
210 Interface for recording switch
211 External recording switch
212 External communication interface
213 External device

Claims (8)

A plurality of in-vehicle electronic control devices are connected to the first communication bus,
The control information of the plurality of in-vehicle electronic control devices is configured to be transmitted between the in-vehicle electronic control devices through the first communication bus,
In a vehicle data recorder for recording information transmitted from the plurality of on-vehicle electronic control devices,
An abnormality detection means connected to the first communication bus, inputting control information through the first communication bus, and detecting an abnormality of the in-vehicle electronic control device from the input control information;
Diagnostic communication means for performing diagnostic communication with the on-vehicle electronic control device and inputting unique information of the on-vehicle electronic control device;
Recording means for recording information input from the in-vehicle electronic control device,
When an abnormality is detected in the control information input from the in-vehicle electronic control device by the abnormality detection means, a diagnostic communication is performed by the in-vehicle electronic control device in which the abnormality is detected among the plurality of in-vehicle electronic control devices and a diagnostic communication means. And the recording unit records the unique information input by the diagnostic communication unit. Comprising an abnormality predicting means for predicting the occurrence of an abnormality of the in-vehicle electronic control device from the control information input through the first communication bus;
When the occurrence of an abnormality is predicted by the abnormality predicting means, the diagnostic communication means performs diagnostic communication with the on-vehicle electronic control device in which the occurrence of the abnormality is predicted,
2. The vehicle data recorder according to claim 1, wherein the recording means records unique information input by the diagnostic communication means from the time when occurrence of an abnormality is predicted. While performing diagnostic communication with the on-vehicle electronic control device, if an abnormality is detected in the other on-vehicle electronic control device by the abnormality detection unit, or an abnormality is predicted on the other on-vehicle electronic control device by the abnormality prediction unit If
The diagnostic communication means stops diagnostic communication with the on-vehicle electronic control device that is currently performing diagnostic communication, and another on-vehicle electronic control device in which an abnormality is detected or another on-vehicle electronic control device in which an abnormality is predicted The vehicle data recorder according to claim 1 or 2, wherein diagnostic communication is performed. 4. The vehicle data recorder according to claim 1, wherein the plurality of in-vehicle electronic control devices are connected to a second communication bus, and the diagnostic communication is performed through the second communication bus. 5. The vehicle data recorder according to claim 1, wherein the recording means records control information of a predetermined on-vehicle electronic control device at the same time when recording the unique information of the on-vehicle electronic control device. . When the abnormality predicting means predicts the occurrence of abnormality of the in-vehicle electronic control device from the input control information, and the diagnostic communication means is performing diagnostic communication with the in-vehicle electronic control device,
4. The abnormality detection unit monitors unique information of an in-vehicle electronic control device that performs diagnostic communication, and records the unique information by the recording unit when an abnormality is detected. 4. The vehicle data recorder according to 4 or 5. Sub-recording means for temporarily recording information input from the on-vehicle electronic control device,
The sub-recording means records information input from each on-vehicle electronic control device every time,
When an abnormality is detected by the abnormality detection unit, control information of a predetermined time width including a time point when the abnormality recorded in the sub-recording unit is detected,
In addition, when diagnostic communication is performed with the in-vehicle electronic control device in which an abnormality has occurred before the occurrence of the abnormality, the abnormality input from the in-vehicle electronic control device in which the abnormality has occurred and recorded in the sub-recording means is detected. 7. The vehicle data recorder according to claim 1, 2, 3, 4, 5 or 6, wherein the specific information having a predetermined time width including the specified time point is recorded in the recording means. The recording means can start recording of control information and unique information of the on-vehicle electronic control device by an external recording switch provided outside, or 1, 2, 3, 4, 5, 6 or 8. The vehicle data recorder according to 7.

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