WO2013014765A1

WO2013014765A1 - Vehicle data recording apparatus

Info

Publication number: WO2013014765A1
Application number: PCT/JP2011/067106
Authority: WO
Inventors: 橋本　佳幸
Original assignee: トヨタ自動車株式会社
Priority date: 2011-07-27
Filing date: 2011-07-27
Publication date: 2013-01-31

Abstract

This vehicle data recording apparatus is provided with: a data acquisition means for acquiring data indicative of the use condition or driving condition of a vehicle, in order to reliably record and retain data indicative of the use conditions and driving conditions of a vehicle at the time when a major event occurs, without using a large amount of the recording capacity of a recording unit; and a recording control means for recording in a recording unit the data acquired by the data acquisition means, when a predetermined parameter of the data acquired by the data acquisition means departs from a predetermined range. The recording control means compares data, acquired by the data acquisition means, that includes a predetermined parameter whereby the degree of departure from the predetermined range is large, with data that includes a predetermined parameter whereby the degree is small, assigns priority to the data, and records the data in the recording unit.

Description

Vehicle data recording device

The present invention relates to a vehicular data recording apparatus, and more particularly to a vehicular data recording apparatus which is mounted on a vehicle and is suitable for recording data indicating a use state or a running state of the vehicle in a recording unit.

2. Description of the Related Art Conventionally, a vehicle data recording apparatus that erases data with low priority from a recording unit is known (see, for example, Patent Document 1). In this vehicular data recording apparatus, according to the type of data, a higher priority is given to data, and the priority of data whose importance decreases with time is low. Updated to value. When the remaining capacity that can be recorded and held in the recording unit falls below a predetermined capacity, the data recorded in the recording unit is erased in order from the data with the lower priority so that the data with the higher priority remains.

JP 2009-15789 A

However, in the vehicle data recording apparatus described in Patent Document 1 described above, since the priority of data is lowered with the passage of time, when the data when a serious event occurs becomes old data, the old data is It may be overwritten with new data and erased. For this reason, there is a possibility that data when a serious event occurs does not remain in the recording unit.

The present invention has been made in view of the above points, and provides a vehicular data recording apparatus capable of reliably recording and holding data at the occurrence of a serious event without increasing the recording capacity of a recording unit. The purpose is to do.

The object is to acquire data when a data acquisition unit that acquires data indicating a use state or a driving state of a vehicle and a predetermined parameter out of a predetermined range among the data acquired by the data acquisition unit. And a recording control unit that records the data acquired by the recording unit in a recording unit, wherein the recording control unit includes the predetermined parameter acquired by the data acquiring unit within the predetermined range. This is achieved by a vehicular data recording apparatus that records the data when the degree of deviation from the data is large in the recording unit with priority over the data when the degree is small.

According to the present invention, it is possible to reliably record and hold data indicating the use state and running state of the vehicle when a serious event occurs without increasing the recording capacity of the recording unit.

1 is a configuration diagram of a system including a vehicle data recording apparatus according to an embodiment of the present invention. It is a flowchart of an example of the main routine performed in the vehicle data recording device which is one Example of this invention. It is a flowchart of an example of the subroutine performed in order to perform a data recording process in the data recording device for vehicles which is one Example of this invention.

Hereinafter, specific embodiments of the vehicle data recording apparatus according to the present invention will be described with reference to the drawings.

FIG. 1 shows a configuration diagram of a system including a vehicle data recording apparatus 10 according to an embodiment of the present invention. The vehicle data recording device 10 according to the present embodiment is a device that is mounted on a vehicle and records data indicating the use state and the running state of the vehicle, and analyzes the use state and the running state of the vehicle after the vehicle travels. For this purpose, the recorded data is output externally.

As shown in FIG. 1, the system of this embodiment includes a vehicle data recording device 10. A sensor 12 and an electronic control unit (ECU) 14 are connected to the vehicular data recording apparatus 10 directly or via an in-vehicle communication network 16. In the vehicular data recording apparatus 10 of this embodiment, as shown in FIG. 1, the sensor 12 is directly connected and the ECU 14 is connected via the in-vehicle communication network 16. Each of the vehicle data recording device 10 and the ECU 14 can perform mutual communication according to a protocol suitable for the in-vehicle communication network 16.

The sensor 12 is a sensor that outputs an electrical signal corresponding to longitudinal acceleration, accelerator opening, brake oil pressure, tire air pressure, etc., indicating the use state or running state of the vehicle. The ECU 14 is mainly composed of a microcomputer and outputs an electrical signal corresponding to longitudinal acceleration, vehicle speed, accelerator opening, brake hydraulic pressure, tire air pressure, shift position, steering angle, etc., indicating the use state or running state of the vehicle. This is a control circuit that can be supplied to another ECU via the in-vehicle communication network 16.

The sensor 12 and the ECU 14 may be provided with only one sensor that outputs a signal indicating one specific use state or traveling state, but outputs a signal indicating a different use state or traveling state. Two or more may be provided. For example, the sensor 12 is a longitudinal acceleration sensor that outputs an electrical signal corresponding to the longitudinal acceleration, and the ECU 14 is an engine control ECU that performs engine control, a brake control ECU that performs brake control, and a steering control ECU that performs steering control. is there. The output signal of the sensor 12 is supplied to the vehicle data recording device 10, and the output signal of the ECU 14 can be supplied to the vehicle data recording device 10.

The vehicular data recording device 10 is a data recording ECU mainly composed of a microcomputer 20. The microcomputer 20 has a built-in memory 22. The memory 22 includes a volatile RAM 24 that is a temporary recording area and a rewritable nonvolatile flash ROM 26 that is a permanent recording area. The RAM 24 can be recorded only when the ignition switch of the vehicle is turned on, and the flash ROM 26 can be recorded even when the ignition switch of the vehicle is turned off.

Next, the operation of the vehicle data recording apparatus of this embodiment will be described with reference to FIGS. FIG. 2 shows a flowchart of an example of a main routine executed by the microcomputer 20 in the vehicle data recording apparatus 10 of the present embodiment. FIG. 3 shows a flowchart of an example of a subroutine executed by the microcomputer 20 to perform data recording processing to the flash ROM 26 in the vehicle data recording apparatus 10 of the present embodiment.

In the vehicular data recording apparatus 10 according to the present embodiment, when the ignition switch of the vehicle is turned on, the microcomputer 20 thereafter periodically transmits a signal from the sensor 12 and the ECU 14 at a predetermined sampling interval s (for example, 500 ms). Based on the signal from the vehicle, various usage states and running states of the vehicle are sampled (step 100). Then, the sampled data indicating the use state and the running state at substantially the same timing are collectively recorded in the RAM 24 (step 200). In the RAM 24, all data sampled in the past predetermined time (for example, 2 seconds, 5 seconds, 10 seconds, 1 minute, etc.) t1 is temporarily recorded.

When the microcomputer 20 samples the use state or running state of the vehicle in the step 200, next, whether or not the data indicating the use state or running state of the vehicle should be recorded in the flash ROM 26, or the data recording is performed. It is determined whether or not to end (hereinafter referred to as trigger ON / OFF determination) (step 300). Note that the data as the determination parameter used in the trigger ON / OFF determination may be at least one of the data obtained by using the sensor 12 and the ECU 14 in the current sampling, for example, the longitudinal acceleration of the vehicle May be data indicating. Further, when two or more pieces of data both satisfy the trigger ON condition or the trigger OFF condition, the trigger ON determination or the trigger OFF determination may be affirmed. Further, the data to be recorded in the flash ROM 26 includes at least the data as the determination parameter and includes other data (for example, vehicle speed, accelerator opening, brake hydraulic pressure, shift position, steering angle, etc.). That's fine.

In step 300 described above, the determination as to whether or not the data indicating the use state or the running state of the vehicle should be recorded in the flash ROM 26 is performed before the data recording in the flash ROM 26 is executed (hereinafter, referred to as “recording data”). This is referred to as “pre-trigger ON determination”, and is affirmed when the sampled data as a determination parameter indicating the use state or running state of the vehicle satisfies the trigger ON condition. The determination as to whether or not the data recording to the flash ROM 26 should be terminated is a determination performed when the data recording to the flash ROM 26 is being executed (hereinafter referred to as a determination after trigger ON), and is sampled. The determination is affirmed when data as a determination parameter indicating the use state or running state of the vehicle satisfies the trigger OFF condition.

For example, when the longitudinal acceleration as the determination parameter sampled this time by the sensor 12 exceeds the trigger threshold (for example, 0.3 G) (for example, 0.5 G), the determination before trigger ON is affirmed, and data is recorded in the flash ROM 26. The trigger is turned on. In this case, recording of data indicating the use state and the running state of the vehicle in the flash ROM 26 is permitted. Further, when the longitudinal acceleration as the determination parameter sampled this time by the sensor 12 falls below the trigger threshold (for example, 0.3 G) (for example, 0.1 G), the determination after the trigger is turned on is affirmed, and the trigger is turned off. In this case, the recording of the data indicating the use state and the running state of the vehicle in the flash ROM 26 is terminated.

When the microcomputer 20 performs the trigger ON / OFF determination in the above step 300, the microcomputer 20 next performs a process for recording data indicating the use state or the running state of the vehicle in the flash ROM 26 (hereinafter referred to as a data recording process). Execute (step 400). Note that the data per trigger to be recorded in the flash ROM 26 when the trigger is switched from OFF to ON includes all the data within the predetermined past time t1 temporarily recorded in the RAM 24, and will be described later. Data obtained using the sensor 12 or the ECU 14 before the predetermined time t2 elapses after the trigger is switched from OFF to ON may be included.

In the data recording process, the microcomputer 20 first determines whether or not the determination before trigger ON is affirmed in step 300, that is, whether or not the trigger is switched from OFF to ON from the previous sampling to the current sampling. (Step 402). For example, whether the longitudinal acceleration sampled by the sensor 12 was a value smaller than the trigger threshold (for example, 0.3 G) in the previous sampling, but has shifted to a value larger than the trigger threshold in the subsequent sampling. Is determined.

If the microcomputer 20 determines in step 402 that the trigger has been switched from OFF to ON, it then determines whether or not the recording area of the flash ROM 26 is full of past data (step 404). Whether or not the recording area of the flash ROM 26 is full is determined by determining whether the flash ROM 26 includes data at least within the past predetermined time t1 temporarily recorded in the RAM 24 (specifically, past data temporarily recorded in the RAM 24). It may be performed based on whether or not there is a remaining area in which data for one trigger including data within the predetermined time t1 and data until the predetermined time t2 after the trigger elapses can be recorded.

If the microcomputer 20 determines in step 404 that there is a remaining area where data for one trigger can be recorded in the flash ROM 26 and the recording area of the flash ROM 26 is not full, then the remaining area is used as the current trigger. Is set as a recording area for storing all data (data acquired within the past predetermined time t1 temporarily recorded in the RAM 24 and data acquired until the predetermined time t2 after the current trigger elapses). Perform (step 406).

On the other hand, if it is determined in step 404 that there is no remaining area in the flash ROM 26 where data for one trigger can be recorded and the recording area of the flash ROM 26 is full, then all the data recorded in the flash ROM 26 is next stored. For each of the triggers, when the trigger is switched from OFF to ON (that is, when the trigger is established), a process of reading the value of data (determination parameter) indicating the use state or running state of the vehicle that satisfies the trigger ON condition is performed ( Step 408). For example, as a trigger in which data is recorded in the flash ROM 26, events in which the longitudinal acceleration as a determination parameter is larger than a trigger threshold (for example, 0.3 G) in the past are “0.35 G”, “0.38 G”, When “0.40 G” and “0.55 G” have occurred 5 times, the longitudinal acceleration as the determination parameter for 5 times is read from the flash ROM 26.

The microcomputer 20 obtains the degree of deviation from the trigger threshold (in the case of longitudinal acceleration, the degree of increase) of the determination parameter that satisfies the trigger ON condition at the time when the trigger is established and is temporarily recorded in the RAM 24 by the current sampling. Compared with the degree of deviation from the trigger threshold (in the case of longitudinal acceleration, the degree of increase) of the determination parameter satisfying the trigger ON condition at the time of trigger establishment for every past trigger read in 408.

If the trigger threshold value is not changed, the determination parameter value itself that satisfies the trigger ON condition at the time when the trigger is established and is temporarily recorded in the RAM 24 is obtained for each trigger read in step 408 above. Even when comparing with the value of the determination parameter satisfying the trigger ON condition itself at the time when the trigger is established, there is no difference from the comparison result of the above divergence degrees, so instead of comparing the above divergence degrees, determination The parameter values themselves may be compared.

Then, the degree of deviation from the trigger threshold of the determination parameter satisfying the trigger ON condition at the time when the trigger is acquired that is obtained by sampling this time and temporarily recorded in the RAM 24 is set to the trigger ON condition at the time when the trigger is satisfied for every past trigger. Whether or not the degree of deviation of the satisfied determination parameter from the trigger threshold is greater than any one, that is, data obtained by all the past triggers recorded in the flash ROM 26 is acquired by the current sampling and stored in the RAM 24. It is determined whether or not there is a parameter that includes a determination parameter at the time when the trigger is established whose degree of deviation is smaller than the degree of deviation from the trigger threshold of the determination parameter that satisfies the trigger ON condition when the trigger is temporarily recorded (step 410). .

For example, the trigger threshold is 0.3 G, the longitudinal acceleration at the current sampling is 0.5 G, and the longitudinal acceleration at the time when all past triggers recorded in the flash ROM 26 are 0. In the case of 35G, 0.38G, 0.40G, and 0.55G, the longitudinal acceleration (0.5G) or the degree of deviation from the trigger threshold (+ 0.2g) at the current sampling is recorded in the flash ROM 26. It is determined whether or not it is larger than any one of the longitudinal acceleration at the time when all the triggers are established or the degree of deviation from the trigger threshold.

As a result, when it is determined that the degree of deviation from the trigger threshold of the determination parameter at the time when the current trigger is established is smaller than any of the degree of deviation from the trigger threshold of the determination parameter at the time when the trigger is established for every past trigger Thereafter, the process of step 402 is executed again without any further process. On the other hand, it is determined that the degree of deviation of the determination parameter from the trigger threshold at the time when the trigger is established is greater than any one of the degrees of deviation of the determination parameter from the trigger threshold at the time of establishment of the trigger for every past trigger. In this case, next, the record that stores the data by the trigger having the smallest deviation from the trigger threshold value of the determination parameter at the time when the trigger is established among the data for all the past triggers recorded in the flash ROM 26. The area stores all data acquired by the current trigger (data acquired within the past predetermined time t1 temporarily recorded in the RAM 24 and data acquired until the predetermined time t2 after the current trigger elapses). Setting as a recording area is performed (step 412). In the above example, an area in which data based on the trigger of the determination parameter (longitudinal acceleration = 0.35G) having the smallest deviation from the trigger threshold is stored is the determination parameter (longitudinal acceleration = 0. 5G) is a recording area for storing data.

When the microcomputer 20 sets the recording area for storing all the data acquired by the current trigger in the

above step

406 or 412, the microcomputer 20 acquires it by sampling from the past predetermined time t1 temporarily recorded in the RAM 24 to the present time. The data from the sensor 12 and the ECU 14, that is, the data from the sensor 12 and the ECU 14 obtained at the time when the trigger is obtained and the past sampling temporarily recorded in the RAM 24 before the time when the trigger is established. A process of recording the acquired data from the sensor 12 and the ECU 14 in the flash ROM 26 which is a permanent recording area is performed (step 414). When the microcomputer 20 records the data in the flash ROM 26, the microcomputer 20 executes the process of step 402 again.

If the microcomputer 20 does not determine in step 402 that the trigger has been switched from OFF to ON, that is, if it is determined that the trigger has not changed or the trigger has been switched from ON to OFF, the next trigger is After switching from OFF to ON, it is determined whether or not recording of all data from the sensor 12 and ECU 14 to the flash ROM 26 is completed until a predetermined time t2 after the trigger elapses (step 416). . As a result, if it is determined that the recording has not been completed, the sensor 12 or ECU 14 that is acquired until the predetermined time t2 after the trigger elapses after the previous trigger is switched from OFF to ON. Are sequentially recorded in the flash ROM 26 (step 418), and then the process of step 402 is executed again. On the other hand, if it is determined in step 416 that the recording has been completed, the process of step 402 is executed again.

Thus, in the vehicle data recording apparatus 10 of the present embodiment, in principle, when the determination parameter satisfies the trigger ON condition in the trigger ON / OFF determination, the data for one time by the current trigger, that is, the current trigger. Permanent recording of all data acquired by sampling before and after (specifically, past data acquired before a predetermined time t1 when the trigger is established and data acquired until a predetermined time t2 has elapsed since the trigger is established) It can be permanently recorded in the flash ROM 26, which is an area.

Specifically, when the trigger parameter satisfies the trigger ON condition in the trigger ON / OFF determination, if there is a remaining area in the flash ROM 26 where data for one trigger can be recorded, the data for the first trigger is flashed. Record in the remaining area of the ROM 26.

On the other hand, when the determination parameter in the trigger ON / OFF determination satisfies the trigger ON condition, if there is no remaining area in the flash ROM 26 where data for one trigger can be recorded, the recording control is performed as follows. That is, the degree of divergence of the determination parameter from the trigger threshold at the time when the trigger is established with the current trigger is any of the degree of divergence from the trigger threshold of the determination parameter at the time when the trigger is established for every past trigger recorded in the flash ROM 26. If it is smaller than this, recording of data for one time by the present trigger in the flash ROM 26 is not performed. On the other hand, the degree of deviation of the determination parameter from the trigger threshold at the time when the trigger is established in the current trigger is any of the degree of deviation of the determination parameter from the trigger threshold at the time of establishment of the trigger for each of the past triggers recorded in the flash ROM 26. If it is larger than one, data for one time triggered by the current trigger is recorded in the flash ROM 26.

The degree of deviation of the determination parameter from the trigger threshold at the time when the trigger is established in the current trigger described above is the degree of deviation from the trigger threshold of the determination parameter at the time when the trigger is established for every past trigger recorded in the flash ROM 26. When the data is larger than any one of the above, the recording of the data for one time by the present trigger in the flash ROM 26 is performed from the trigger threshold value of the determination parameter among the data for all the past triggers recorded in the flash ROM 26. This is performed for a recording area in which data based on a trigger having the smallest deviation is stored.

When the recording control as described above is performed, when the recording area of the flash ROM 26 is full of past data, among the data acquired for all triggers, the determination parameter that satisfies the trigger ON condition when the trigger is established The data when the degree of deviation from the trigger threshold is large is recorded in the flash ROM 26 with priority over the data when the degree of deviation is small.

The greater the degree of deviation from the trigger threshold of the determination parameter that satisfies the trigger ON condition when the trigger is established, the higher the possibility that a serious event has occurred in the vehicle. The use state and the running state are useful, and it is effective to record data indicating the use state and the running state in the flash ROM 26. On the other hand, the data when the deviation degree from the trigger threshold of the determination parameter satisfying the trigger ON condition at the time of the trigger establishment is less useful than the data when the deviation degree is large, and is recorded in the flash ROM 26. Lack of need.

Therefore, according to the vehicle data recording apparatus 10 of the present embodiment, the data indicating the use state and the running state of the vehicle at the occurrence of a serious event is reliably recorded and held in the flash ROM 26 without increasing the recording capacity of the flash ROM 26. It is possible to record data in the flash ROM 26 efficiently. For this reason, even if the data is old in time series, data when the degree of deviation from the trigger threshold of the determination parameter that satisfies the trigger ON condition at the time when the trigger is established is relatively large should be recorded and held in the flash ROM 26. Is possible.

In the above-described embodiment, the microcomputer 20 temporarily records in the RAM 24 data indicating the use state or the running state of the vehicle that is sampled based on the signal from the sensor 12 or the ECU 14 at a predetermined sampling interval s. In the “data acquisition means” described in the above range, the determination parameter used in the trigger ON / OFF determination is in the “predetermined parameter” described in the claim, and the range in which the determination parameter does not satisfy the trigger ON condition is claimed In the “predetermined range” described in the range, the flash ROM 26 executes the step 400 in the routine shown in FIG. 2, that is, the routine shown in FIG. These correspond to “recording control means” recited in the claims.

In the above embodiment, the data amount for one trigger is “predetermined amount” described in the claims, and the microcomputer 20 executes the process of step 404. The “region discriminating means” corresponds to the “comparing means” described in the claims that the microcomputer 20 executes the processing of step 410, and the RAM 24 corresponds to the “temporary recording unit” described in the claims. ing.

By the way, in the above-described embodiment, when the longitudinal acceleration is taken as an example of the determination parameter, it means that the longitudinal acceleration exceeds the trigger threshold value means “out of the predetermined range” described in the claims. The degree of increase from the trigger threshold value means the “degree that deviates from the predetermined range” described in the claims. However, depending on the determination parameter, the determination parameter may be lower than the trigger threshold value. It means “out of the predetermined range”, and the degree of lowering from the trigger threshold of the determination parameter may mean “degree out of the predetermined range” recited in the claims.

In the above-described embodiment, the longitudinal acceleration, the vehicle speed, the accelerator opening, the brake hydraulic pressure, the tire pressure, the shift position, and the steering angle are given as the use state or the running state of the vehicle. However, the present invention is not limited to this. It is good also as applying to the image of the camera etc. which image | photograph the surroundings of the own vehicle and the vehicle interior of the own vehicle instead of what.

10 vehicle data recording device 12 sensor 14 ECU
20 Microcomputer 22 Memory 24 RAM
26 Flash ROM

Claims

Acquired by the data acquisition means when the data acquisition means for acquiring data indicating the use state or the running state of the vehicle and a predetermined parameter out of the predetermined range among the data acquired by the data acquisition means. A vehicle data recording device comprising: a recording control means for recording the data in a recording unit;
The recording control unit gives priority to the data when the predetermined parameter acquired by the data acquisition unit is largely out of the predetermined range as compared with the data when the degree is small. A vehicular data recording apparatus characterized in that recording is performed on the vehicle.
A remaining area determining means for determining whether or not there is a remaining area capable of recording a predetermined amount of the data in the recording unit;
When the predetermined parameter acquired by the data acquisition unit is out of the predetermined range and the remaining area determination unit determines that the remaining area does not exist in the recording unit, the current acquisition unit acquires the current parameter. Comparison means for comparing the degree of the predetermined parameter deviating from the predetermined range with the degree of the predetermined parameter included in the past data recorded in the recording unit being out of the predetermined range;
As a result of the comparison by the comparison unit, the recording control unit is configured so that the predetermined parameter acquired by the data acquisition unit this time is less than the predetermined range in the past data recorded in the recording unit. In a case where the predetermined parameter having a small degree of deviating from the predetermined range is included, the data acquisition unit this time in the recording area of the recording unit in which the data including the predetermined parameter having the smallest degree is recorded. The vehicle data recording apparatus according to claim 1, wherein the acquired data is recorded.
As a result of the comparison by the comparison unit, the recording control unit is configured so that the predetermined parameter acquired by the data acquisition unit this time is less than the predetermined range in the past data recorded in the recording unit. 3. The recording of the data acquired by the data acquisition unit at this time to the recording unit is not performed when there is nothing that includes the predetermined parameter whose degree of deviation from the predetermined range is small. Vehicle data recording apparatus.
The recording control means, when the predetermined parameter acquired by the data acquisition means is out of the predetermined range, while the remaining area determining means determines that the remaining area exists in the recording unit, 3. The vehicular data recording apparatus according to claim 2, wherein the data acquired by the data acquisition means is recorded in the remaining area of the recording unit.
5. The vehicle data recording apparatus according to claim 1, wherein the recording unit is a permanent recording area.
The vehicle data recording apparatus according to any one of claims 1 to 5, wherein the data acquisition means acquires the data by periodically sampling the data.
The vehicle data recording apparatus according to claim 6, further comprising a temporary recording unit capable of recording the data acquired by the data acquisition means for a predetermined time.