EP3619689A1

EP3619689A1 - Method and device for situation-dependent storage of data of a system

Info

Publication number: EP3619689A1
Application number: EP18728591.1A
Authority: EP
Inventors: Heribert BR UTIGAM; Heiko Diederichs
Original assignee: Audi AG
Current assignee: Audi AG
Priority date: 2017-06-02
Filing date: 2018-05-29
Publication date: 2020-03-11
Also published as: US20200210336A1; US11580021B2; WO2018219886A1; CN110709899A

Abstract

The proposed invention relates to a method for situation-dependent storage of data of a system, in which data of the system is detected, is amalgamated in at least one data block (9, 9a) and is stored in a volatile memory, and in which, in response to the occurrence of at least one predefined trigger event (5) in the at least one data block, amalgamated data are transferred from the volatile memory into a read-only memory, and in which a time window, in which the data for the at least one data block is captured, is selected automatically and dynamically according to the at least one trigger event (5).

Description

Method and device for situation-dependent storage of

Data of a system

The present invention relates to a method for situation-dependent storage of data of a system and a recording system for storing data of a system in the event of the occurrence of a predetermined triggering event.

Systems, such as vehicles, may be equipped with data recorders for recording in an accident. The main task of such data recorders is to ensure the intended behavior of

Vehicle systems in accident situations to make comprehensible. For this purpose, relevant data from a period of a few seconds before the accident are recorded in accident situations and near-accident situations, such as when an airbag is triggered or when emergency braking is triggered. These data are designed to objectify accidents to individual accident parties and to assist in understanding the course of the accident and understanding its circumstances. With currently available data recorders are usually at a trigger, d. H. when a trigger event occurs, only data stored in a period prior to the triggering event. Thus, for example, a data recording can end with the triggering of a restraint system. Such a fixed end of data storage may result in the loss of important information after the triggering event.

The document DE 0 2015 208 358 A1 discloses a method and a system for recording and / or securing video data in one Vehicle revealed. It is provided that the video data

detected event-controlled and stored in a ring buffer.

Document DE 10 2013 206 948 A1 discloses an apparatus and a method for providing data of an autonomous system and a method for producing an autonomous system. It is provided that during operation of the device by means of an autopilot in a certain interval of a sensor detected data are stored in a local memory.

A memory unit for a vehicle data recording is in

Publication DE 10 2014 205 924 A1 discloses.

Against this background, it is an object of the present invention to provide a way to store data of a system both before and after an accident.

To solve the above object, a method for situation-dependent storage of data of a system is presented. For this purpose, it is provided that data of the system recorded in at least one

Data block and stored in a volatile memory. It is further provided that, in response to an entry of at least one predetermined triggering event, data combined in the at least one data block is transferred from the volatile memory to a read-only memory. In this case, it is further provided that a time window in which the data for the at least one data block is detected is automatically and dynamically selected as a function of the at least one triggering event. Embodiments of the present invention will become apparent from the

Description and the dependent claims.

The presented method is used, in particular, for storing data of a system, such as, for example, a vehicle when an entry occurs

Tripping event, such as a switch from an automatic drive to a manual drive, in an accident or emergency braking. For this purpose, the proposed method is based on the idea of a "recording window" or a time window in which data is detected that is to be transferred into a volatile memory and finally from the volatile memory into a read-only memory, variably at a time for triggering the data Data collection, d. H. a triggering event,

parameterizable to define. It can be those shares of

Time windows that are before or after the triggering event, each firmly defined or influenced by other parameters.

It is envisaged that current data of the system, i. H. Data that has been detected by sensors of the system and / or processed by control units of the system, initially in a volatile memory, such as a ring buffer cached and in the case of

Occurrence of a triggering event from which volatile memory is transferred to a read only memory, ie a nonvolatile memory such as an EEPROM or a flash memory. In this case, the time window from which the data recorded therein in the event of the occurrence of the triggering event is transferred from the volatile memory in the non-volatile memory variable at the time for triggering the recording (trigger) of the data and their transmission in the non-volatile Memory parameterizable defined. In order to obtain an impression of a state of the system after a triggering event, such as an ignition of an airbag has taken place, it is provided according to the invention that in a time window determined by the triggering event, ie, depending on a type of triggering event, data of the system , ie, for example, a vehicle detected, are first transferred to a volatile memory and then into a permanent memory. It is provided that the data to be transferred into the volatile memory in at least one

Data block summarized in the volatile data memory to be transferred. At this time, the data stored in the volatile memory is continuously updated.

In particular, it is provided that a time window or a time range in which the data, which may in particular be operating data of a system, to be captured and transmitted to the read-only memory, is selected as a function of a respective triggering event, ie a trigger. This means that the time window is adapted or parameterized dynamically depending on a respective triggering event. For this purpose, a list may be provided, the respective triggering events, which are predetermined, for example, by a number of sensor values and / or settings of devices of a respective system, a time window, ie a first time at which data acquisition starts and a second time to which the data collection ends. By successive transfers of respective data into the volatile memory, which may, for example, be a ring buffer, the data in the volatile memory is updated continuously by respective transmissions. In this case, provision is made, in particular, for the data to be updated, for example, in a first region of the volatile memory which corresponds to a predetermined time range of, for example, 30 seconds before a current time Time is assigned, so that the volatile memory in this first area always maps the data that were detected in the specified time range before the current time. Furthermore, the volatile memory may have a second area or additional areas

Have storage capacities in which the data to be acquired after the occurrence of a triggering event is to be written.

According to the invention, data is transferred from a volatile memory to a read-only memory in response to a triggering event. In this case, it can be provided, in particular, that data acquired even after the triggering event are transmitted to the volatile memory and subsequently to the read-only memory. This means that after an occurrence of the triggering event, the volatile memory continues to be filled with data for a period of time which may for example be predetermined or is determined by an available memory space and the data is then transferred from the volatile memory into the read-only memory that in the read-only memory also data is stored, which were detected after the occurrence of the triggering event. In an embodiment of the presented method is provided in particular that the data stored in the volatile memory by means of a so-called "sliding window protocol" depending on the at least one triggering event with a different time horizon before and after the at least one triggering event in the read-only memory. In this case, the time window is chosen to be so large that at most the first area of the volatile memory is filled when respective data acquired in the time window is transferred to the volatile memory. If a triggering event, such as, for example, an activation of a restraint mechanism, is detected within the time window or at a current time, the time window is increased, so that a second triggering event is also activated Area of volatile memory is filled with data. In this case, the second area of the volatile memory is filled with data which were or will be recorded in time after the triggering event. This means that the time window, which specifies a time range in which data is recorded, written into the volatile memory and subsequently in the read-only memory, depends on the occurrence of a

Trigger event changed dynamically, d. H. especially becomes larger compared to a standard operation. If no trigger event is detected, the data written to the volatile memory is not transferred to the read-only memory. In this case, the data written to the volatile memory is overwritten by new or current data. The time window provided according to the invention can be varied by a respective triggering time, ie. H. a trigger, can be defined parameterizable. In this case, respective portions of a recording period before or after the triggering time can be firmly defined or influenced by currently detected parameters.

It is of course provided that in the event that one

Trigger event is detected, each recorded data, after they have been written to the memory, in the memory no longer be overwritten.

A possible example of a sequence of the presented method in a system can be configured, for example, as follows:

1) acquiring data of the system by reading sensors and / or controllers at a time t0; 2) transferring the data read out to a volatile memory at a time t1;

3) acquiring data of the system by reading sensors and / or controllers at a time t2;

3a) transmitting the read-out data and overwriting the data in the volatile memory at a time t4, if no triggering event was detected;

3b) If a triggering event was detected at a time t3, t2 <t3 <t4: transferring data acquired in a predetermined time range [f.3-x, t3] before the triggering event into the fixed memory;

3c) detecting data acquired by the sensors after the triggering event or processed by the control units,

3d) transmitting the read-out data into the volatile memory at a time t5, and

3e) transferring the data acquired in a predetermined time range [t3, t3 + y] after the triggering event into the fixed memory in addition to the data transmitted in step 3b). x and y are respective periods of time, where x, y can each be in the seconds, minutes or hours range. The times t0, t1, t2, t3, t4 and t5 are concrete times, which can be defined in each case with date and concrete time.

In one possible embodiment of the presented method, it is provided that the predetermined triggering event is predetermined by a list of predetermined triggering events. It is provided that at least one value of a sensor of the system and / or a state of a component of the system is assigned by the list to each triggering event of the list. In particular, the inventively provided system a

Vehicle, a wind turbine, an escalator, an elevator, an autonomous flying drone, an alarm system or any other technical system.

Of course, a plurality of trigger events may be provided, each leading to a collection of data beyond a time of occurrence of the respective triggering event, i. H. lead to a collection of data that are after the time of the occurrence of the triggering event. In this case, a triggering event, for example, can be reported by a central control unit or recognized by a safety control device by matching values detected by respective sensors of a respective system with values specified in the above list.

As a triggering events, for example, a change of an operating mode of a respective system, such as. A vehicle from a

fully automatic operation in a manual operation or activation or deactivation of an assistance system may be provided. Of course, it is also possible to detect a plurality of triggering events of different systems or triggering events of the same system that occur several times in succession, which in each case lead to a transmission into the system

Lead to permanent memory. In a further possible embodiment of the presented method, it is provided that the time window in which the data is acquired and transmitted into the volatile memory extends from a first time before the triggering event to a second time after the triggering event. It is provided in particular that the first time and / or the second time are provided in a fixed predetermined time interval to a respective triggering event or each other. By a fixed time interval to a respective triggering event, a storage space requirement can be set, so that by a fixed time interval of the first time from the trigger event always enough space in a respective volatile memory is ready to data, from the triggering event to the second time were collected, cached.

In a further possible embodiment of the presented method, it is provided that as the first time a time between 40 seconds and 20 seconds, preferably between 35 seconds and 25 seconds, more preferably exactly 30 seconds before the triggering event and as the second time a time between 40 seconds and 20 seconds, preferably between 35 seconds and 25 seconds, more preferably exactly 30 seconds after the triggering event is selected.

A distance of 30 seconds to a respective trigger event has been found to be particularly advantageous, for example, to reconstruct an accident.

In a further possible embodiment of the presented method, it is provided that the first time and / or the second time are selected as a function of the triggering event.

Since different triggering events require different event horizons, it may be useful to adapt a data collection to a type of a respective triggering event. Thus, for example, be provided that in an accident as a triggering event on a particularly large Time window of, for example, several minutes, data is captured and

get saved. In contrast, it can be provided that in a

Error message as a triggering event only for a few seconds data is collected and stored. In either case, the respective time window may extend beyond the time of the triggering event, i. H. the first time as the start of the time window may be before and the second time as the end of the time window may be after the time of the occurrence of the trigger event.

In a further possible embodiment of the presented method, it is provided that as the second time a time is selected, to which the volatile memory is completely filled.

In order to determine as much data as possible on a trigger event, such as an accident, it may be provided that a respective volatile memory is used completely. For this purpose, it may be provided that a predefined first area of the volatile memory is described with data which were acquired prior to a respective triggering event and a corresponding remaining area or area of the volatile memory not associated with the first area is described with data which is determined according to FIG

Trigger event were recorded. For this purpose, the volatile memory, for example, so long to be described with data until the volatile memory is full.

In a further possible embodiment of the presented method, it is provided that a permanent memory via a

Communication interface of the system to be contacted server is selected.

The solid-state memory provided according to the invention can, in particular, be, for example, a server designed as a so-called "cloud storage" or each be to be contacted via a communication interface of the inventively provided system server or memory.

Of course, the solid-state memory provided according to the invention may also be a solid-state memory, such as an EEPROM, which is encompassed by the system provided according to the invention.

Furthermore, the presented invention relates to a recording system for storing data of a system in the event of an occurrence of a

predetermined trigger event, wherein the recording system comprises at least one volatile memory, at least one read-only memory and a controller, wherein the controller is configured to detect data of the system, in at least one data block

to store the at least one data block in the at least one volatile memory and to transfer data stored in the volatile memory to a read-only memory in response to an occurrence of the predetermined trigger event, wherein a time window in which to acquire the data for the at least one data block are in

Dependent on the at least one triggering event is dynamically and automatically specified.

The presented recording system is used in particular for carrying out the presented method. Further advantages and embodiments will become apparent from the description and the accompanying drawings.

It is understood that the features mentioned above and those yet to be explained not only in the particular combination given, but also in other combinations or in isolation are usable without departing from the scope of the present invention.

The invention is schematically illustrated by means of embodiments in the drawing and will be described schematically and in detail with reference to the drawing.

FIG. 1 shows a schematic representation of a sequence of a possible embodiment of the presented method.

FIG. 1 shows a flow chart which is oriented along a time axis 1. For example, at an instant t0, an automated driving function of a system, such as a vehicle, is active, as indicated by bar 3. At a time t1, a triggering event occurs by a request to a driver to control the vehicle by taking manual control. At a time t2, another triggering event, such as activation of a restraint system of the vehicle, occurs, as indicated by symbol 5. In accordance with traditionally employed methods, data recording of data of the vehicle ends with the deactivation of the automatic

Driving function at time t1, as indicated by bar 7, which represents a record of data during an automatic driving operation according to traditional methods, so that events that occur after the time t1 can not be reconstructed.

A series of events leading to the activation of the

Restraint system of the vehicle have led to the time t2, according to the presented method is provided that data not only before the time t1 but also on the time t1 Be detected. It is envisaged that a

Recording readiness of a recording system for detecting the data from the time t1, when the driver is indicated that he should control the vehicle manually, remains active for a predetermined or variable period of time. Accordingly, it is envisaged that the

Recording system "observed" beyond the time t1, d. H. Writes data to a volatile memory. For this purpose, currently acquired data are combined in a data block 9 and transferred to the volatile memory. The data stored in the volatile memory is continuously replaced by new data blocks 9, updated and / or expanded.

When a triggering event, such as the changes in the operating state of the vehicle from the autonomous operation to the manual operation, is detected at time t1, a time window in which data in the volatile memory and finally in the volatile memory becomes a ROM to be transferred, depending on the

Tripping event selected. In the case of the triggering event at time t1, the data in a time range 9a, which extends from a first time before time t1 to a second time after time t1, can be transferred into the read-only memory and evaluated accordingly later. For this purpose, it is provided that the data lying after the time t1 are detected after the time t1, written into the volatile memory and then, for example, after expiration of the time range 9a, written to the read-only memory.

In the case of a triggering event, the data stored in the volatile memory can be retroactively transferred to the read-only memory in the period between t1 and t2, even if the fully automatic operating mode has already ended. It is envisaged that the recording period in a so-called "sliding window approach" can be made variable in time, as indicated by bar 9. Only when a triggering event is detected, the data stored in the volatile memory becomes one

Fixed memory and saved for evaluation. It is

provided that a size or a border region of a respective

Window of the "sliding window approaches" can be fixed and / or possibly changed depending on a respective detected triggering event.

It is also conceivable that only data is transferred to the read-only memory before a respective triggering event, such as the activation of the restraint system at time t2. This can the

Trigger event "activation of the restraint system" to be associated with a time window that is characterized by times that lie before or at the time t2.

Claims

claims

1 . A method for situationally storing data of a system in which data of the system is acquired, in at least one

Data block (9, 9a) are combined and stored in a volatile memory, and in which data combined in the at least one data block in response to an occurrence of at least one predetermined triggering event (5) is transferred from the volatile memory to a read only memory; a time window in which the data for the at least one data block are detected is selected automatically and dynamically as a function of the at least one triggering event (5).

2. Method according to claim 1, in which data recorded as data of the system are selected by at least one sensor of the system and / or data processed by at least one control unit of the system.

3. The method of claim 1 or 2, wherein the at least one predetermined triggering event (5) by a list of predetermined

Trigger events (5) is given, and in which by the list each trigger event (5) of the list is associated with at least one value of a sensor of the system and / or a state of a component of the system.

4. The method of claim 1, wherein the time window is from a first time before the at least one triggering event to a second time after the

Trigger event (5) extends.

5. The method of claim 4, wherein the first time and / or the second time in a fixed predetermined time interval to the at least one triggering event (5) are provided.

6. The method of claim 5, wherein as the first time a time between 40 seconds and 20 seconds, preferably between 35 seconds and 25 seconds, more preferably exactly 30 seconds before

Trigger event (5) and as a second time a time between 40 seconds and 20 seconds, preferably between 35 seconds and 25 seconds, more preferably exactly 30 seconds after the

Tripping event (5) is selected.

7. The method of claim 4, wherein the first time and / or the second time depending on the at least one trigger event (5) are selected dynamically.

8. The method of claim 4, wherein the second time a

Time is chosen at which the volatile memory is completely filled.

9. The method according to any one of the preceding claims, wherein the data stored in the volatile memory by means of a so-called "sliding window protocol" depending on the at least one

Trigger event with a different time horizon before and after the at least one trigger event are transferred to the memory.

A method according to any one of the preceding claims, wherein deactivating autonomous operation of the system is selected as the at least one triggering event.

1 1. Method according to one of the preceding claims, in which a server to be contacted via a communication interface of the system is selected as the fixed memory.

A recording system for storing data of a system in the event of occurrence of at least one predetermined triggering event (5), the recording system comprising at least one volatile memory, at least one read-only memory and a controller, the controller being configured to continuously acquire data of the system in at least one data block (9, 9a) and storing the at least one data block in the at least one volatile memory, and wherein the controller is further configured to respond in response to an occurrence of the predetermined trigger event (5) in the at least one volatile memory Memory to transfer stored data in the at least one read-only memory, wherein a time window from which the data collected therein and summarized to at least one data block of the at least one volatile memory to be transferred to the at least one read-only memory, depending on the min at least one triggering event (5) is or will be set dynamically and automatically.