阅读说明：本技术 车辆机动化系统的监控方法 (Method for monitoring a vehicle motorized system ) 是由 安托万·佩罗汀 皮埃尔·苏姆 奥利维尔·罗奇 亚历克西斯·杜·加尔丁 于 2019-07-08 设计创作，主要内容包括：本发明涉及一种用于监控车辆的机动化系统的方法,包括：将预确定参数组的值记录在电子控制单元的易失性存储器中的步骤；在某一时刻发生异常时,确定在发生异常的时刻之前的时间段内的参数组的值的记录序列的步骤,该时间段包括三个子时间段：在第一子时间段内,该序列具有第一采样步长,在第二子时间段内,该记录序列具有大于第一采样步长的第二采样步长,在第三子时间段内,该记录序列具有大于第二采样步长的第三采样步长；将该记录序列存储在易失性存储器中的步骤。(The invention relates to a method for monitoring a motorized system of a vehicle, comprising: a step of recording values of the predetermined parameter group in a volatile memory of the electronic control unit; a step of determining, when an abnormality occurs at a certain time, a recorded sequence of values of the parameter group in a period before the time at which the abnormality occurs, the period including three sub-periods: during a first sub-period, the sequence has a first sampling step size, during a second sub-period, the recording sequence has a second sampling step size larger than the first sampling step size, during a third sub-period, the recording sequence has a third sampling step size larger than the second sampling step size; a step of storing the recording sequence in a volatile memory.)

1. A method for monitoring a motorized system of a vehicle, in particular of a motor vehicle, the motorized system comprising an electronic control unit having a volatile memory and a non-volatile memory, the monitoring method comprising:

-a step of recording the values of a predetermined set of parameters in a volatile memory of the electronic control unit;

-when an anomaly occurs at a certain moment, a step of determining a recorded sequence of values of said set of parameters in a time period preceding the moment at which the anomaly occurred, said time period comprising three sub-time periods:

recording the values of the parameter set in the recording sequence in a first sub-period before the instant of occurrence of the anomaly in a first sampling step,

recording the values of the parameter set in the recording sequence in a second sub-period preceding the first sub-period with a second sampling step larger than the first sampling step,

recording the values of the parameter set in the recording sequence in a third sub-period preceding the second sub-period with a third sampling step larger than the second sampling step;

-a step of storing said recorded sequence in said non-volatile memory.

2. The method of claim 1, wherein the first sampling step is equal to 100ms, the second sampling step is equal to 500ms, and the third sampling step is equal to 10 seconds.

3. The method of claim 1 or 2, wherein the first sub-period of time has a duration equal to 5 seconds, the second sub-period of time has a duration equal to 10 seconds, and the third sub-period of time has a duration equal to 285 seconds, the period of time having a total duration equal to 300 seconds.

4. The method according to any of the preceding claims, wherein the recorded sequence of values of the predefined set of parameters further comprises values of the set of parameters acquired in a sampling step equal to the first sampling step for a period of time after an anomaly occurred.

5. Method according to the preceding claim, wherein said period of time after the occurrence of an anomaly has a duration less than or equal to said first sub-period of time.

6. Method according to any one of the preceding claims, wherein the occurrence of an anomaly is determined by the electronic control unit generating a code P.

7. Method according to the preceding claim, characterized in that the step of recording the values of the set of parameters comprises erasing in the volatile memory values having a duration of presence greater than six minutes with respect to the current time.

8. Method according to any one of the preceding claims, wherein the storing of the recording sequence in the non-volatile memory is performed when the electronic control unit is deactivated.

9. An electronic control unit for a motorized system of a vehicle, comprising volatile memory and non-volatile memory, the electronic control unit being configured to implement the method according to any one of the preceding claims.

10. A motor vehicle comprising an electronic control unit according to the preceding claim.

Technical Field

The present invention relates generally to an electronic control unit, referred to as ECU, also referred to as electronic control unit, which is installed in particular in a motor vehicle.

The invention relates in particular to a method for monitoring the occurrence of anomalies in motor vehicles, in order to improve the quality of the electronic control unit by better understanding the faults.

Background

It is known to continuously record context information, more generally values of a predefined set of parameters, in an electronic control unit of a vehicle when a fault occurs in the vehicle. When an anomaly occurs, in particular in connection with a motorized system, which is indicated in particular by the electronic control unit by generating a code P within the electronic control unit, this information can be analyzed in order to characterize and resolve the anomaly that occurs.

However, in the prior art, the information collected may not be sufficient to allow analysis of certain anomalies. In fact, the information currently collected gives a "photograph" of the values of the important parameters at the time of signaling the fault, but it does not record the temporal variations of these values in the moment before signaling the fault. In addition, the number of accessible parameters is limited.

Disclosure of Invention

The present invention is therefore directed to solving these drawbacks by proposing a method for storing the values of available parameters in case of an exception, in particular for any exception indicated by an error code. Storing parameter values when an anomaly occurs, the method allows collecting these parameter values in a semi-continuous manner and storing them according to a particular scheme comprising three time periods before the anomaly occurs, wherein the three sampling steps are different.

More precisely, in order to achieve this object, the invention relates to a method for monitoring a motorized system of a vehicle, in particular of a motor vehicle, which motorized system comprises an electronic control unit having volatile memory and non-volatile memory. The monitoring method comprises the following steps:

-a step of recording the values of the predetermined set of parameters in a volatile memory of the electronic control unit;

-a step of determining, when an anomaly occurs at a certain moment, a recorded sequence of values of the set of parameters in a time period preceding the moment at which the anomaly occurred, the time period comprising three sub-time periods:

recording the values of the parameter set in the recording sequence in a first sub-period before the instant of occurrence of the anomaly with a first sampling step,

recording the values of the parameter set in the recording sequence in a second sub-period preceding the first sub-period with a second sampling step larger than the first sampling step,

recording the values of the parameter set in the recording sequence in a third sub-period preceding the second sub-period with a third sampling step larger than the second sampling step;

-a step of storing the recorded sequence in a non-volatile memory.

Advantageously, the first sampling step is equal to 100ms, the second sampling step is equal to 500ms and the third sampling step is equal to 10 seconds.

Advantageously, the first sub-period has a duration equal to 5 seconds, the second sub-period has a duration equal to 10 seconds and the third sub-period has a duration equal to 285 seconds, the period having a total duration equal to 300 seconds.

Advantageously, the recorded sequence of values of the set of predefined parameters further comprises values of the set of predefined parameters acquired in a sampling step equal to the first sampling step during a period of time after the occurrence of the anomaly.

Advantageously, the period of time after the occurrence of the anomaly has a duration less than or equal to the first sub-period of time. Advantageously, the first sub-period has a duration equal to 2 seconds, the second sub-period has a duration equal to 10 seconds, the third sub-period has a duration equal to 347 seconds, and the period following the instant of occurrence of the anomaly has a duration equal to 1 second, this period having a total duration equal to 360 seconds.

Advantageously, the occurrence of an anomaly is determined by the electronic control unit generating a code P.

Advantageously, the step of recording the values of the set of parameters comprises erasing in a volatile memory the values having a duration of presence greater than six minutes with respect to the current instant.

Advantageously, the recording sequence is stored in a non-volatile memory when the electronic control unit is deactivated.

Advantageously, the duration of the sub-periods and/or the sampling steps is calibratable.

The invention also relates to an electronic control unit for a motorized system of a vehicle, comprising a volatile memory and a non-volatile memory, the electronic control unit being configured to implement the method as briefly described above.

The invention also relates to a motor vehicle comprising such an electronic control unit.

Drawings

Further features and advantages of the invention will appear upon reading the detailed description of embodiments of the invention, given by way of example only and with reference to the accompanying drawings, in which:

fig. 1 is a schematic diagram illustrating a chronological sequence of generating records in accordance with the present invention.

Detailed Description

In the following, the described embodiments relate in particular to implementing data sampling according to the invention in a motor vehicle. However, the invention also relates to any embodiment in different situations, in particular in any type of vehicle.

The method according to the invention allows monitoring the context information received by the electronic control unit during a period of time before the occurrence of an anomaly, in particular indicated by the generation of the code P. Starting from the start of the motorised system, the electronic control unit saves in its data memory data, in particular values of a predefined set of parameters, such as context information allowing an analysis of anomalies, that is to say accidents or feared events. Exceptions, accidents or feared events are for example: the lighting of an engine warning Light called MIL (refer to a fault indicator Light in english), or the stalling of a motorized system.

FIG. 1 shows a timeline representing sampling of context data at different frequencies over three time periods. The timeline begins with the start of the motorized system 8, and the anomaly to be analyzed occurs at time 4. The values of the predefined parameter sets are continuously recorded in a volatile memory of the electronic control unit. When an anomaly occurs at time 4, a recording sequence of values of the predefined parameter set is implemented. The recording sequence comprises sampling of values recorded in a volatile memory of the electronic control unit. In other words, the recording sequence corresponds to a "movie", allowing reproduction of variations in the values of the predefined parameter set around the time of occurrence of the anomaly.

According to the invention, this sampling extends over the period of time in fig. 1 comprised between the instant 7 and the instant 4 at which the anomaly occurred. Thus, the time period is prior to the time at which the anomaly occurred, and has three consecutive different sub-periods. The first sub-period 1 extends from instant 5 to before instant 4. The duration of time segment 1 is, for example, five seconds, and the sampling step size at the first sub-time segment 1 corresponds in particular to saving the values of the predefined parameter set every 100 ms. The second sub-period 2 extends from instant 6 to instant 5 onward and has in particular a duration of ten seconds. Thus, in this case, time 6 is located thirteen seconds before time 4. The sampling step size of the second sub-period 2 corresponds in particular to saving the values of the predefined set of parameters every 500 ms. The third partial time period 3 extends from instant 7 to instant 6 onwards and lasts in particular 285 seconds. In this case, time 7 is 300 seconds before time 4. The sampling step size over the third sub-period 3 corresponds in particular to saving the values of the predefined parameter set every 10 seconds.

Thus, the generated recording sequence, i.e. "movie", comprises the changes in the values of this predefined set of parameters over the period of time before the occurrence of anomaly 4, and has differentiated sampling steps: more data is retained very close to time 4 where the anomaly occurred.

Since different sampling steps are used over different sub-periods, a large amount of data can be recorded around the anomaly. Thus, in particular, only one fifth of the information is retained during the second sub-period and only one twentieth of the information is retained during the third sub-period with respect to the first sub-period.

According to an embodiment, the recording sequence thus comprises a 6 minute sequence in which the values of the set of predefined parameters are recorded in sample steps that increase with the age of the data.

According to an embodiment, parameter values having a lifetime of more than 6 minutes are automatically erased from the volatile memory and replaced by updated values.

When an anomaly occurs, a recording sequence is thus generated. This recorded sequence is stored, for example, in a non-volatile memory of the electronic control unit during deactivation of the electronic control unit, in particular of the motorized system.

The data collected by the recording sequence constitutes a backup that allows it to be analyzed in order to allow understanding of the origin of the anomaly and the way it is resolved if necessary.

According to an embodiment, the recording sequence further comprises values of the predefined set of parameters recorded after the occurrence of an anomaly, preferably within a time period of less than or equal to the first sub-period, i.e. in particular less than or equal to 3 seconds. During this period of time after the occurrence of an anomaly, the sampling step size of the values recorded in the recording sequence is in particular equal to the first sampling step size, i.e. in particular 100 ms. This allows the abnormality to be analyzed over a total period of time extending before and after the time at which the abnormality occurs.

When an unexpected event or a worrying event occurs, such as a thermal engine stall or a MIL warning light on, in particular accompanied by the generation of the code P by the electronic control unit, indicating that the abnormality occurred is related to a malfunction of the motorised system, the values of the predefined set of parameters may be aborted to the last known value.

Preferably, the duration of the sub-periods and the sampling steps are calibrated.

Additionally, multiple recording sequences may be collected in parallel to resolve multiple companion anomalies that may occur. In this case, the material resources of the electronic control unit are adapted to the purpose.

When the vehicle is started again, the electronic control unit starts collecting new data.

The method according to the invention therefore has the advantage of allowing a large amount of data to be collected for posterior analysis thereof. Collecting values of a predefined set of parameters over time allows a faster understanding of the cause of an anomaly in order to formulate a suitable solution.