JP2015151936A - vehicle information recording device and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle information recording device capable of recording vehicle information more surely.SOLUTION: A CPU11, when there is a trigger for recording start in S2 (S2: YES), starts recording of vehicle information in S3. The CPU11 creates a data file for writing the vehicle information on a storage region configured by a nonvolatile memory 13. Then the data file is opened, and the vehicle information is written at a predetermined time interval (for example, 100 ms) together with time information. In S4, presence/absence of a termination trigger is determined, and when the termination trigger is absent, it is determined whether or not a vehicle is in an engine stall state and a vehicle stop state in the next S6. When the vehicle is determined to be in the engine stall state and in the vehicle stop state (S6: YES), the data file in which the wiring of the vehicle information is being executed is closed in S7.

Description

  The present invention relates to a vehicle information recording apparatus that stores vehicle information indicating a running state of a vehicle in a storage device.

  2. Description of the Related Art Conventionally, there is a vehicle information recording device that stores vehicle information indicating a running state of a vehicle in a nonvolatile memory. For example, an automobile data recording device has been proposed that records engine speed, accelerator opening, etc. in an EEPROM at a timing determined by at least two combinations of vehicle speed, engine speed, and ignition switch on / off (patent). Reference 1). This automobile data recording apparatus records data for 10 seconds after the vehicle speed reaches 0 km / h.

Japanese Patent Laid-Open No. 5-104985

  If an engine stall occurs during driving and the cranking is performed by operating the starter motor in an attempt to restart the engine immediately, the battery's sudden voltage drop will occur and the data being recorded will be lost. There is a possibility.

  The objective of this invention is providing the vehicle information recording device and program which can record vehicle information more reliably.

  The invention according to claim 1, which has been made to solve the above-described problem, stores vehicle information indicating a state of a vehicle including an engine as a driving source for traveling on a storage area configured by a nonvolatile memory (13). A vehicle information recording device (1) comprising recording control means (11) for continuously writing to a data file and engine stall determination means (11) for determining whether or not the engine has stalled.

  The recording control means in the vehicle information recording apparatus of the present invention closes the data file in which the vehicle information has been written when the engine determination means determines that the engine has stalled. Features.

  The vehicle information recording apparatus configured in this way can quickly close the data file that was being written when the stall was made. Therefore, even if the battery voltage temporarily drops suddenly due to cranking after the engine stall, the possibility of an open state where the data file is likely to be lost at that timing can be reduced, and vehicle information can be obtained more reliably. Can be recorded.

  By the way, although each means which comprises the vehicle information recording device of the said Claim 1 may be implement | achieved by hardware, a computer is functioned as each means of a vehicle information recording device as described in Claim 4. You may implement | achieve by the program for making it do. With such a program, the computer can function as the vehicle information recording device according to claim 1.

  In addition, the code | symbol in the parenthesis described in this column and a claim shows the correspondence with the specific means as described in embodiment mentioned later as one aspect, Comprising: The technical scope of this invention is shown. It is not limited.

It is a block diagram which shows schematic structure of a vehicle information recording device. It is a figure explaining the specific example of the recording operation of vehicle information. It is a flowchart which shows the process sequence of a vehicle information recording process.

Embodiments of the present invention will be described below with reference to the drawings.
[Embodiment]
(1) Overall Configuration As shown in FIG. 1, a vehicle information recording device 1 (hereinafter referred to as ECU 1) of this embodiment is used by being mounted on a vehicle including an engine as a driving source for traveling. It is a device that records vehicle information that is data indicating information. The vehicle information corresponds to, for example, data indicating engine (E / G) rotation speed, vehicle speed, acceleration, angular velocity, steering angle information, data indicating GNSS information (position information), and the like.

  The ECU 1 includes a CPU 11, a nonvolatile memory 13, a RAM 15, a ROM 17, an output interface (I / F) 19, a power circuit 21, a power detection circuit 23, a GNSS receiver 25, a vehicle information detection circuit 27, a switch detection circuit 29, and a sensor detection circuit. 30 and the like.

  The CPU 11 controls the ECU 1 according to a program stored in the ROM 17 or the like. This CPU 11 is an example of a recording control means, an engine stall determination means, and a vehicle speed determination means in the present invention.

  The non-volatile memory 13 is a memory that can hold data even when power is not supplied, and a memory controller (not shown) receives a command from the CPU 11 and stores vehicle information. Typical examples of the nonvolatile memory include a flash memory and an EEPROM. The non-volatile memory 13 stores engine information in addition to vehicle information.

  The engine stall information is data including a flag indicating that the vehicle has stalled during the recording of the vehicle information (hereinafter also simply referred to as engine stall) and time information. The engine stall is a phenomenon in which the engine stops regardless of the driver's intention.

The output interface 19 is an interface for connecting to an external device when the vehicle information stored in the nonvolatile memory 13 is output to the external device.
The power supply circuit 21 is a circuit that is connected to a constant power supply (+ B) and an accessory power supply (ACC) of the vehicle and converts input power from these to necessary power, and the converted output power is each of the components constituting the ECU 1. Supplied to the site. Major processing in the ECU 1 is executed when the accessory power supply is on.

  The power supply detection circuit 23 is connected to a constant power supply, an accessory power supply, and an ignition power supply (IG), and is a circuit that outputs a power supply state signal indicating the on / off state of each power supply to the CPU 11. Note that these power sources are output from a common battery, and the output can be switched on and off by operating the ignition key. The IG signal may be acquired from the CAN 33 described later by the vehicle information detection circuit 27.

A GNSS (Global Navigation Satellite System) receiver 25 receives a signal output from a GNSS satellite by the GNSS antenna 31 and outputs the signal to the CPU 11.
The vehicle information detection circuit 27 is connected to a CAN (Controller Area Network) 33, and is a circuit that acquires information indicating the state of the vehicle output by another ECU connected to the CAN 33 and outputs the information to the CPU 11.

  The switch detection circuit 29 is a circuit that acquires a signal indicating an input operation on the driver's switch 35 and outputs the content of the input operation to the CPU 11. The switch 35 is configured to be capable of an on operation for starting the recording of the vehicle information and an off operation for stopping the recording of the vehicle information, and is provided at a position where the driver can operate, for example, in the vicinity of the instrument panel. .

  The sensor detection circuit 30 is connected to a plurality of travel information sensors 37 and is a circuit that outputs travel information acquired from the travel information sensor 37 to the CPU 11. The traveling information sensor 37 is a sensor that acquires data indicating the traveling state of the vehicle. For example, the traveling information sensor 37 corresponds to an acceleration sensor or an angular velocity sensor, but information from other sensors may be acquired.

  The CPU 11 starts recording vehicle information when the switch 35 is turned on when the accessory power is on, and the vehicle information is recorded when the accessory power is turned off or when the switch 35 is turned off. End recording.

The ECU 1 includes a well-known real time clock (not shown), and the CPU 11 can acquire information on the current time.
(2) Control by CPU 11 (2-1) Recording operation of vehicle information at the time of occurrence of engine stall A specific example of the vehicle information recording control at the time of engine stall by the ECU 1 of the present embodiment will be described with reference to FIG. FIG. 2 shows the operation of the ECU 1 in time series when the engine is stalled while the vehicle is running and the driver starts the engine after a predetermined time has elapsed.

  In FIG. 2, “key state” indicates a switching state of the ignition key (IG key). The IG key is switched by the driver's operation. The IG key has a lock position where only the power supply is always on ((iii) in FIG. 2), an ACC position where the constant power supply and the accessory power supply are on (same (iv)), any of the constant power supply, the accessory power supply, and the IG power supply. Switch to the ON position (same (i), (ii), (vii)) where the motor is turned on, and the START position (same (v), (vi)) where the power supply is always on and the cranking by the starter motor is executed Is possible.

  The “vehicle state” is information necessary for the recording control of vehicle information by the CPU 11. Specifically, the E / G rotation speed, the traveling speed (vehicle speed) of the vehicle, the output state of the constant power source (+ B), and the output state of the accessory power source (ACC) correspond to the vehicle state.

  Further, in “inside the ECU”, “+ B−DET” and “ACC-DET” are power state signals indicating the on / off states of the constant power source and the accessory power source. The “ECU state” indicates the state of operation / processing of the ECU 1, and the “processing / determination” indicates the specific processing content.

  The “logging state” indicates whether or not the vehicle information is written to the data file (being logged). When the ECU state is “writing to the non-volatile memory” and the logging state is “logging”, it means that the vehicle information is written to the data file.

  The operation example of FIG. 2 starts from a state in which the IG key is at the position (i), the vehicle is running, and vehicle information is being recorded. During logging, vehicle information is continuously written in a data file on a storage area composed of the nonvolatile memory 13. The continuous writing means that the writing process is executed at a predetermined cycle or a short time interval.

  When engine stall occurs in this state, the E / G rotation speed decreases. At the same time, the vehicle speed decreases, the vehicle speed becomes zero, and the vehicle stops. The key state remains on as shown in (ii) until the driver operates.

  The CPU 11 checks the engine stall and vehicle stoppage by monitoring the E / G rotation speed and the vehicle speed. As shown in “Processing / Determination”, the occurrence of engine stall is confirmed when the IG key is on and the E / G rotation speed is equal to or lower than a predetermined threshold (200 rpm in the present embodiment). Further, when the vehicle speed becomes equal to or lower than a predetermined threshold (10 km / h in this embodiment), the stop of the vehicle is confirmed.

  When the engine stall and the vehicle stop are confirmed, the CPU 11 executes the closing of the data file being logged so that the data is not easily lost due to the battery voltage drop. Further, the CPU 11 backs up the engine stall information in a predetermined storage area of the nonvolatile memory 13. After the file close and backup are completed, the ECU 1 enters a standby state.

  Here, when the driver operates the IG key to set the lock position as shown in (iii), the accessory power supply is turned off and ACC-DET goes to a low level, and each function of the ECU 1 is safely stopped to save power. An ACC termination process is executed to set the standby state.

  When the driver operates the IG key in the standby state to set the ACC position as shown in (iv), the accessory power supply is turned on, and the startup process is executed to bring the ECU 1 into a startup state in which each function can be executed. .

  When the ECU 1 is in an activated state, the E / G rotation speed is confirmed and whether the engine stall information is backed up. The E / G rotation speed is equal to or greater than a predetermined threshold (500 rpm in the present embodiment), the backup of the engine stall information exists, and the elapsed time from the time information included in the engine stall information to the current time is equal to or less than the predetermined threshold. Logging is resumed when all of the above are satisfied.

Here, although the backup of the engine stall information exists, the E / G rotation speed is equal to or less than the predetermined threshold value, so that logging is not started and a standby state is entered.
Thereafter, when the driver tries to start the engine and switches the IG key to the START position (v), the accessory power supply is turned off, so the above-described ACC termination process is executed. In addition, as a result of the voltage of the power supply constantly decreasing due to the cranking, + B-DET temporarily becomes a low level, and + B end processing is started. After that, when the voltage of the power supply is restored, the standby state is maintained until the accessory power supply is turned on.

  When the engine starts and the E / G speed increases, the driver returns the IG key from the (vi) START position to the (vii) ON position. As a result, the accessory power supply is turned on, and the ECU 1 executes the startup process described above.

  When the ECU 1 is in an activated state, the E / G rotation speed is confirmed and whether the engine stall information is backed up. Here, there is a backup of engine stall information, and the E / G rotation speed exceeds a predetermined threshold. In addition, since the elapsed time from the time information included in the engine stall information to the current time is less than or equal to a predetermined threshold (in this embodiment, 5 minutes), the backup engine engine information is deleted and logging is restarted.

(2-2) Vehicle information recording process The vehicle information recording process which CPU11 of ECU1 performs is demonstrated based on the flowchart of FIG. This process is started when the ECU 1 is activated by receiving power from the accessory power source.

  In this process, first, in S1, it is determined whether or not the engine stall information is backed up. If the stall information has not been backed up (S1: NO), the process proceeds to S2. If the engine stall information has been backed up (S1: YES), the process proceeds to S9.

  In next S2, it is determined whether or not there is a trigger to start recording. The trigger for starting recording is that the switch 35 is turned on, but other triggers may be used. If there is no recording start trigger (S2: NO), S2 is executed again, and the process waits until there is a trigger. If there is a recording start trigger (S2: YES), the process proceeds to S3.

  In the next S3, recording of vehicle information is started. The CPU 11 creates a data file in which vehicle information is written on a storage area configured from the nonvolatile memory 13. Then, the data file is opened, and vehicle information is written together with time information at a predetermined time interval (for example, 100 ms).

  After starting the recording of the vehicle information, it is determined in S4 whether there is a recording end trigger. The recording end trigger is that the switch 35 has been turned off or the accessory power source is turned off, but other triggers may be used. If there is a recording end trigger (S4: YES), the process proceeds to S5. On the other hand, if there is no recording end trigger (S4: NO), the process proceeds to S6.

  In the next S5, the file is closed. Here, the writing operation to the data file in which the writing of the vehicle information has been executed is terminated, and the data file is set in a protected state. Thereafter, the process returns to S2.

  In S6, it is determined whether the engine is stalled and the vehicle is stopped. Here, it is determined that the engine is stalled when the ignition power is on (IG key is in the ON position) and the E / G rotational speed is equal to or less than a predetermined threshold (200 rpm). Further, when the vehicle speed is equal to or lower than a predetermined threshold (10 km / h), it is determined that the vehicle is stopped. When all these conditions are satisfied, it is determined that the engine is in the stalled state and the vehicle is in a stopped state.

  If it is not determined that the engine is stalled and the vehicle is stopped (S6: NO), the process returns to S4. On the other hand, if it is determined that the vehicle is in the stalled state and the vehicle is stopped (S6: YES), the data file in which the vehicle information has been written is closed in S7 as in S5 described above.

  In next S8, the engine stall information related to the engine stall determined in S6 is backed up in the nonvolatile memory 13. The time information included in the engine stall information can be, for example, the time determined in S6 as the engine stalled state and the vehicle stopped state. After this S8, this process ends.

  The time recorded as the time information may be a predetermined timing due to the occurrence of engine stall, and is not limited to the determination timing in S6. For example, the time determined to be in the stalled state may be recorded as time information, or the time at which backup is performed in S8 may be recorded as time information.

  In S9, it is determined whether or not the E / G rotation speed is equal to or greater than a predetermined threshold (500 rpm). If it is not equal to or greater than the predetermined threshold (S9: NO), this process ends. On the other hand, if it is equal to or greater than the predetermined threshold (S9: YES), the process proceeds to S10.

  In next S10, it is determined whether or not the elapsed time from the execution of backup in S8 to the current time is within a predetermined time (5 minutes). Here, the elapsed time is calculated from a comparison between the time information included in the engine stall information and the current time. If it is within the predetermined time (S10: YES), recording of vehicle information is started in S11 as in S3 described above, and the engine stall information backed up in S12 is deleted. Thereafter, the process proceeds to S4.

  On the other hand, if the elapsed time is not within the predetermined time (S10: NO), the engine stall information backed up in S13 is deleted without starting the recording of the vehicle information. Thereafter, the process returns to S2.

(3) Effect The CPU 11 of the ECU 1 of the present embodiment continuously writes vehicle information indicating the state of the vehicle including the engine as a driving source for travel to a data file on a storage area configured by the nonvolatile memory 13. . Further, the CPU 11 determines whether or not the engine has stalled (S6). When it is determined that the engine has stalled, the CPU 11 closes the data file in which the vehicle information has been written (S7).

  That is, the ECU 1 of the present embodiment quickly closes the data file that was being written when the stall was made. After the engine stalls, the engine is restarted. At this time, the ECU 1 is driven by receiving power from a battery mounted on the vehicle, that is, a battery that drives a starter motor that performs cranking. If the power supply voltage is constantly reduced due to ranking, data being written may be lost.

  However, even if the battery voltage temporarily drops suddenly due to cranking after the engine stall, the ECU 1 reduces the possibility that the data file is open at that timing, and the data file is lost. It is suppressed and vehicle information can be recorded more reliably.

  Moreover, ECU1 of this embodiment determines whether CPU11 is the driving speed of a vehicle below a predetermined threshold value (S6). Then, when it is determined that the engine has stalled and the traveling speed of the vehicle is equal to or less than a predetermined threshold, the CPU 11 closes the data file in which the vehicle information has been written (S7). .

  Even if the engine stall is determined, the ECU 1 configured as described above can continue to write the vehicle information in the data file if the vehicle speed is equal to or higher than a certain value, and can acquire vehicle information for a longer period. As a scene where such a function is required, for example, a vehicle traveling on a circuit may slip due to an engine stall. In such a case, there is a desire to record the vehicle information for as long a period as possible after the engine stall.

  If the vehicle speed is above a certain level, the driver needs to operate the vehicle, and during that time, it is unlikely that the engine will be restarted by operating the IG key, so vehicle information will continue to be recorded until the vehicle speed decreases. However, the risk of losing vehicle information does not increase significantly.

  Further, the ECU 1 of the present embodiment resumes the recording in response to the start of the engine even if the recording is interrupted by stopping during the recording of the vehicle information. Therefore, even when it is desired to continuously record the vehicle information, an operation for starting recording by the driver after the engine is started is not required, and convenience is improved.

[Other Embodiments]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that various forms can be taken as long as they belong to the technical scope of the present invention.

  For example, in the above-described embodiment, the configuration in which the data including the flag indicating the engine stall and the time information is recorded in the nonvolatile memory 13 as the engine stall information is illustrated. However, any data that can confirm the engine stall is generated. Data other than the above may be used.

  The engine stall information need not be recorded as a single piece of data. For example, the flag information indicating the engine stall and the data indicating the time information may be recorded as separate data associated with each other.

  Moreover, in the said embodiment, although the structure which determines with having been stalled when the ignition power supply was on and the E / G rotation speed became below a predetermined threshold was illustrated, various determination methods of the engine stall other than the above were also demonstrated. Can be adopted.

  Moreover, in the said embodiment, when the stall state was determined in S6 of FIG. 3, and the vehicle stop state was determined, the structure which performs a file close in S7 was illustrated, but the determination of a vehicle stop state is considered. Alternatively, the file may be closed when the engine stall state is determined. With this configuration, the vehicle information recording period is shortened, but the data file can be securely stored more securely.

  In the above embodiment, the CPU 11 functions as a recording control means, an engine stall determination means, and a vehicle speed determination means in the present invention. However, each means functions as a different CPU, chip, integrated circuit, or the like. May be.

  Moreover, in the said embodiment, in order to measure the time after an engine stall until an engine starts, the structure which compares the time information recorded as engine stall information with the present time was illustrated, but the said time is other than that It may be measured by this method. For example, the structure provided with the timer which counts the time after determining with an engine stall state may be sufficient.

  Moreover, in the said embodiment, although the structure which records vehicle information and engine information in the non-volatile memory 13 was illustrated, the structure memorize | stored in a different recording device may be sufficient. However, in any case, it is desirable to record the data in a recording device capable of holding data without supplying power such as a nonvolatile memory or a hard disk.

Note that the functions of the ECU 1 described above can be realized by a computer by a program.
The program consists of an ordered sequence of instructions suitable for processing by a computer, stored in a ROM or RAM incorporated in the computer, and may be loaded and used from there. It may be loaded into a computer and used via various recording media and communication lines.

  Examples of the recording medium include optical disks such as CD-ROM and DVD-ROM, magnetic disks, and semiconductor memories.

DESCRIPTION OF SYMBOLS 1 ... Vehicle information recording device (ECU), 11 ... CPU, 13 ... Nonvolatile memory, 15 ... RAM, 17 ... ROM, 23 ... Power supply detection circuit, 25 ... GNSS receiver, 27 ... Vehicle information detection circuit, 29 ... Switch detection Circuit 31 ... GNSS antenna 33 ... CAN 35 ... Switch

Claims (4)

A recording control means (11) for continuously writing vehicle information indicating a state of a vehicle including an engine as a driving source for traveling to a data file on a storage area composed of a nonvolatile memory (13);
Engine determination means (11) for determining whether or not the engine has stalled,
The recording control unit closes the data file in which the vehicle information has been written when the engine determination unit determines that the engine has stalled. 1). Vehicle speed determining means (11) for determining whether the traveling speed of the vehicle is equal to or less than a predetermined threshold;
The recording control means determines the vehicle information when the engine determination means determines that the engine has stalled, and the vehicle speed determination means determines that the traveling speed of the vehicle is equal to or less than a predetermined threshold. The vehicle information recording apparatus according to claim 1, wherein the data file that has been written is closed. The vehicle information recording apparatus according to claim 1, wherein the vehicle information recording apparatus is driven by receiving power supply from a battery mounted on the vehicle.   The program for functioning a computer as each means of the vehicle information recording device of Claim 1 or Claim 2.

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