JPH04338891A - Operation data recording system for vehicle - Google Patents

Abstract

PURPOSE:To make a sharp distinction between an accident during forward running and that during backward running to analyze the operation condition just before the accident by making a distinction between forward running and backward running to record the latest operation data in a prescribed running time in a prescribed recording area. CONSTITUTION:Vehicle speed data read in each sampling period and what is called operation data of time data read out from a clock part 10C at the time of running start or division processing of continuous recording are successively recorded in a prescribed recording area of a RAM card 12 from the first address to the last address. Simultaneously, a graph end address and a graph start address are updated, and data are successively recorded again from the first address if either of both updated addresses exceeds the last address, and operation data is repeatedly recorded in the same recording area, and the latest operation data in a prescribed time is recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recording operating data such as running speed, running distance, and running time of a vehicle such as an automobile in a semiconductor memory.

[0002] Conventionally, this kind of recording method captures the running speed of a vehicle (hereinafter referred to as vehicle speed) as a change in amplitude via a converter such as a governor that is linked to the output shaft for measuring vehicle speed of the transmission, and records this as a change in amplitude. The so-called tachograph is a well-known device that records vehicle speed data continuously over time in an analog format by writing with a pen on a disc-shaped recording paper that is superimposed and attached to a disc that rotates in conjunction with the tachograph. .

[0003] Furthermore, with the recent increase in the capacity of semiconductor memories, devices have been proposed in which vehicle speed data is recorded digitally. For example, a vehicle speed sensor that outputs a pulse signal proportional to the rotation of the output shaft is installed between the output shaft for measuring vehicle speed of the transmission and a cable connected to the speedometer. A data collection and processing device formed from a microcomputer etc. is installed near the seat, and this device collects vehicle speed data obtained by counting the output of the vehicle speed sensor at each predetermined sampling period, time data from a clock, and engine key. Operating data such as vehicle speed from on/off signals of switches is processed and stored in semiconductor memory (hereinafter simply referred to as memory).
The information is recorded sequentially at each sampling period.

[0004] After the operation is completed, the semiconductor memory in which the operation data is recorded is subjected to arithmetic processing by an external computer processing device such as a personal computer and output.

[0005]

However, in the former recording method, for example, one disk-shaped recording paper has one
When daily operation data is recorded, the recording paper rotates once every 24 hours, so the recording per minute is 0.25° (=360°/24 x 60). The operating status for one minute is recorded in a very narrow range of rotation angles, and in order to analyze the records, it must be enlarged and judged using a special analyzer, making safe driving difficult for managing a large number of vehicles. This has been a problem in that it is complicated and time-consuming for managers, and it is also difficult to make judgments, making it difficult to provide appropriate individual guidance on safe driving to each driver.

In the latter case, although it is possible to sequentially record vehicle speed data for each sampling period in the memory, it is not possible to clearly distinguish whether the vehicle speed data is when the vehicle is moving forward or when it is reversing. This means that the cause of many traffic fatalities in recent years is not only "excessive speed" but also fatal accidents when reversing, or so-called reversing, which cannot be ignored. The problem is that the situation cannot be analyzed accurately.

Moreover, if the sampling period of vehicle speed data is shortened in order to obtain detailed operation data, the amount of data increases accordingly, resulting in a huge memory capacity.On the other hand, if the sampling period is made long, Although an increase in memory capacity can be avoided, the problem is that it is not possible to accurately grasp the driving situation immediately before an accident occurs, and safe driving managers are unable to analyze the accident and take sufficient measures to prevent recurrence. have.

[0008] The present invention has been made in view of the above-mentioned points, and its object is to record operation data that distinguishes between forward and backward movements in memory without increasing the memory capacity, and to prevent accidents from occurring. The objective is to provide something that allows time analysis to be performed accurately.

[0009]

[Means for Solving the Problems] In order to achieve the above object, the present invention sets in advance a recording area in which operation data for a predetermined period of time can be recorded in a memory, and causes the operation data to be sequentially and repeatedly recorded in the recording area. The latest operation data is always recorded in the area along with the graph start address and graph end address, and the vehicle speed data is recorded so that backward driving can be identified, so that the detailed operation status at the predetermined time immediately before the accident is continuously and The output can be displayed in an analog manner.

0010

Embodiments Hereinafter, embodiments of the present invention will be explained with reference to FIGS. 1 to 7. FIG. 1 is a block diagram showing the basic configuration. In the figure, reference numeral 1 denotes vehicle speed data detection means for outputting vehicle speed data when the vehicle is running. This is a vehicle speed sensor section that is inserted between an output shaft for measuring vehicle speed of a transmission (not shown) and a speedometer connected to this output shaft via a flexible wire, and outputs a pulse signal proportional to the vehicle speed. , the pulse signal of this and the timing signal output from the operation signal generating means 2 (
The vehicle speed counter section counts the pulse signal at every instantaneous sampling period (for example, 0.2 second period) using a clock signal of 0.2 seconds, and outputs this count value as vehicle speed data. There is. The operating signal generating means 2 divides the basic clock oscillated by a crystal oscillator or the like using a frequency divider or the like to generate a clock signal corresponding to the sampling period, and outputs this as a timing signal. There is. Reference numeral 3 denotes a switch signal detecting means for detecting whether the engine key switch 4 is on or off and outputting it. For example, a light-emitting diode of a photocoupler connected to the battery 5 via the engine key switch 4 turns on and off a light-receiving transistor connected to the base of a main transistor connected to a constant voltage power supply (not shown), and the collector of the main transistor is turned on and off. The output is sent as an on/off detection signal for the key switch 4 via a knot circuit. Reference numeral 6 denotes a reversing light (so-called backing lamp) connected to the battery 5 via the engine key switch 4 and a reversing switch 7 that is turned on and off in conjunction with a change lever (not shown). Reference numeral 8 denotes a reverse signal detecting means for detecting whether the reverse switch 7 is turned on or off and outputting the detected result. For example, similar to the switch signal detection means 3, the battery 5 is connected to the base of a main transistor connected to a constant voltage power supply (not shown) by a photocoupler light emitting diode via the key switch 4 and the reverse switch 7. The light-receiving transistor of the photocoupler is turned on and off, and a detection signal indicating whether the reverse switch 7 is turned on or off is sent from the collector of the main transistor via a NOT circuit. Reference numeral 9 denotes a high-speed travel detection means for sending detection signals for driving on a general road (hereinafter referred to as general travel) and traveling on a highway (hereinafter referred to as high-speed travel). For example, a changeover switch and a resistor are connected in series to a constant voltage power source (not shown), and a high-speed running detection signal is output from a connection point between the changeover switch and the resistor when the changeover switch is turned on. The changeover switch is turned on and off by direct operation by the driver. 10 is the above vehicle speed data, an on/off signal of the key switch 4, an on/off signal of the reverse switch 7,
Input the high-speed driving signal, process it, and connect it to connector 11.
This data collection processing means is composed of a microcomputer or the like and is configured to record data in a recording means 12 which is removably inserted and connected via a microcomputer or the like. This includes memory parts 10a and 10b that store processing programs, data, etc., and a serial I
/O A clock unit 10c formed of a clock LSI with a calendar or the like and configured to output time data such as year, month, day, hour, minute, and second.
and via an input/output section 10d connected to the vehicle speed data detection means 1, switch signal detection means 3, reverse signal detection means 8, and high speed running detection means 9, and connected to the recording means 12 via the connector 11. The input/output unit 10d processes the input vehicle speed data and each detection signal, and sends a write command to the input/output unit 10d to sequentially record the vehicle speed data, etc. for each sampling period at a specified address of the recording means 12 via a control unit (not shown). and an arithmetic processing unit 10e that transmits data through the
If the detection signal of the switch signal detection means 3 is an ON signal of the key switch 4, and the recording to the recording means 12 is new (that is, new data collection after the recorded data has been processed by a personal computer or the like, or no new data collection) If this is the first data collection), the recording means 12 reads at least day, hour, minute, and second data from the clock section 10c to start running.
The first address number of the preset recording area
Then, the vehicle speed data input from the vehicle speed data detection means 1 at each sampling period is recorded, and when the input vehicle speed data is the same as the previous vehicle speed data, the sampling period is counted as the same vehicle speed, and this count value is is added until it is no longer the same as the previous vehicle speed data and recorded next to the vehicle speed data.After that, data collection processing is performed in which a write command is sent to sequentially record the vehicle speed data for each sampling period in the same manner, and the operation data is recorded. If exceeds the final address Nm of the recording area, specify the first address No. and send a write command to it, and the same process is repeated sequentially, and the latest operation data at a predetermined time is stored in the recording area. is now recorded. In addition, when the vehicle speed data is continuously recorded, the data collection processing means 10 collects at least each day, hour, minute, and second data from the clock section 10c every preset time interval tS (for example, 1 minute). is read out and recorded. At this time, recording of time data for each delimiter time is stopped while the input vehicle speed data continues to be 0, and is restarted from the point in time when the vehicle speed data is no longer 0. Further, the data collection processing means 10 is configured to sequentially update the address data of the graph start address and graph end address of the record management area set in advance in the recording means 12 each time the operation data is recorded. Furthermore, if the detection signal of the reverse signal detection means 8 is an ON signal of the reverse switch 7, the data collection processing means 10 attaches a reverse identification to the input vehicle speed data and records it in a distinguishable manner. There is. Furthermore, if the detection signal of the high-speed travel detection means 9 is a high-speed travel signal, the data collection processing means 10 is configured to record the detection signal so that it can be discriminated with an identification thereof. Further, when the input vehicle speed data exceeds a preset upper limit value for recording (for example, 80 km/h), the data is shifted and recorded. Furthermore, if the detection signal of the switch signal detection means 3 is an off signal of the key switch 4, the data collection process is stopped. The recording means 12 is a so-called IC card (hereinafter referred to as a RAM card) having a random access memory, connection terminals, etc. ) A data recording area (hereinafter simply referred to as a recording area) where operation data can be recorded and a data recording management area are set in advance, and operation data is sequentially recorded from the first address number of the recording area, and the last address number of the area is set in advance. If the number exceeds the address Nm, the data collection processing means 10 sends the first address No.
is designated and recorded repeatedly and sequentially, and address data of a graph start address and a graph end address are recorded in the data recording management area.

Next, the operation will be explained with reference to FIGS. 2 to 7. Now, when the RAM card 12 is inserted and connected to the input/output unit 10d via the connector 11 and the key switch 4 is turned on, the switch signal detection means 3 sends a signal to the key switch 4.
An on-detection signal is sent. The arithmetic processing unit 10e that receives this via the input/output unit 10d determines that the running has started (1
00), a timer is started, and it is determined whether the RAM card 12 records new data (new data collection after previous data has been processed by a personal computer or the like, or initial data collection) (101). If it is a new record, write the first address No. of the recording area of the RAM card 12 to the graph start address (abbreviation: GSA) and graph end address (abbreviation: GEA) in the data recording management area, and write the above record specified by the graph end address. First address of area N
Write the engine-on mode (for example, 71H) to o, write the day, hour, minute, and second data read from the clock section 10c sequentially from the address No. In the example, 4) is added and rewritten, and after the address specified by this rewritten graph end address, the specified data write address m
(For example, clear m=5) to 0 (write 00H)
, data recording first round flag (hereinafter simply referred to as first round flag)
is cleared to 0 (102), and the process proceeds to step 105, which will be described later.

In step 101, if it is not a new record, it is determined whether the engine on flag is 1 (103).
), if the flag is 1, proceed to step 105 described below; if the flag is not 1, set the engine on flag to 1, and retrieve the day, hour, minute, and second data from the address specified by the graph end address. Sequential writing, rewriting by adding the number of data writing to the address data of the graph end address, and from this rewritten address onwards, m for a predetermined data writing address is cleared to 0 (104). Next, the vehicle speed data DS is read from the vehicle speed data detection means 1 (105
), and determines whether the read vehicle speed data DS is 0 (1
06), if it is 0, proceed to step 109 described below, D
If S is not 0, it is determined whether the delimiter time tS (for example, 1 minute) has been reached (107), and if it has not been reached, the process proceeds to step 109 described below; if it has been reached, the vehicle speed data DS is continuously updated. Assuming that the data is being recorded (i.e., recording while the running is continuing), day, hour, minute, and second data (so-called time data) is recorded every preset time interval ts, and the graph end address and graph start address are recorded. Performs continuous recording separation processing to update addresses (10
8).

Next, when the vehicle speed data DS read in each sampling period is the same as the previous data, the sampling period is counted and recorded, and when it is different, the read vehicle speed data DS is recorded and the graph end address is Then, the vehicle speed data DS is recorded to update the graph start address (109).

Then, it is determined whether the sampling period has ended (for example, whether 0.2 seconds have elapsed) (110), and if the sampling period has ended, the timer is cleared and the operations from step 100 are repeated to read the contents of the RAM card 12. Operation data is sequentially recorded from the first address No. to the final address Nm in the recording area, and the recording of this operation data is temporarily stopped by turning off the engine key switch 4. At this time, if the RAM card 12 is not removed from the connector 11, recording is restarted by the next ON operation of the engine key switch 4, and the above recording operation is repeated until the RAM card 12 is removed.

Next, the continuous recording separation process performed in step 108 will be further explained with reference to FIG. First, day, hour, minute, and second data are sequentially written to the address specified by the graph end address (200), and the number of data written (in this example, 4) is written to the address data of the graph end address.
) is added and rewritten, and from this rewritten address, the predetermined data write address m is cleared to 0 (00H is written) (201), and then the operation data is recorded in the recording area of the RAM card 12 once. It is determined whether the graph end address and the graph start address have been updated (202), and the process returns.

Further, the recording process of the vehicle speed data DS carried out in step 109 will be further explained with reference to FIG. As shown in the figure, first, it is determined whether the vehicle is traveling at high speed (300).
, if the vehicle is running at high speed, determine whether the high speed flag is 1 (
301), if set to 1, step 30 described below
If the flag is not set to 1, the high-speed running flag is set to 1, day, hour, minute, and second data are written (302), and the process proceeds to step 305, which will be described later. In the above step 300, if the high-speed traveling is not performed, it is determined whether the high-speed traveling flag is 0 (303), and if it is 0,
Proceeding to step 305, which will be described later, if the flag is not 0, the high-speed running flag is set to 0, and day, hour, minute, and second data are written (304). Next, it is determined whether to retreat (305),
If reversing, determine whether the reversing flag is 1 (306);
If it is 1, the process proceeds to step 310, which will be described later. If it is not 1, the backward flag is set to 1, and each data of day, hour, minute, and second is written (307), and the process proceeds to step 310, which will be described later. In step 305, if it is not a backward movement, it is determined whether the backward flag is 0 (308), and if it is 0, the process proceeds to step 310, which will be described later. Minute and second data are written (309). Next, it is determined whether the input vehicle speed data DS is the same as the previous vehicle speed data (310), and if they are the same, it is determined whether the data at the address specified by the graph end address is a count value (311), and the count value If so, the count value is added to the data at the address specified by the graph end address, and when this count value exceeds 1 byte, it is carried to the next address, and when it exceeds this address, it is carried to the next address. When this address is exceeded, carry it to the next address and write the number of times of the same vehicle speed (312), then add the above data writing number to the address data of the graph end address and rewrite it. , After this rewritten address, clear m to 0 (write 00H) for a predetermined data write address (3
13), similarly to step 202 above, update the graph end address and graph start address (
314), returns. In step 310, if the vehicle speeds are not the same, it is determined whether the vehicle speed data DS exceeds the vehicle speed Sm as the data recording upper limit set in advance (DS > Sm) (315), and if not, the vehicle speed shift flag is set. is 0 (316),
If it is 0, the process proceeds to step 321, which will be described later. If it is not 0, the vehicle speed shift flag is set to 0 (317), and the process proceeds to step 321, which will be described later. In step 315, the vehicle speed data DS exceeds the vehicle speed Sm. If so, it is determined whether the vehicle speed shift flag is 1 (318), and if it is 1, the process proceeds to step 320, which will be described later.If it is not 1, the vehicle speed shift flag is set to 1 (319), and then the vehicle speed data DS is set. Arithmetic processing is performed on recording vehicle speed data DSS (=DS − Sm) shifted by vehicle speed Sm (320).
, writes the vehicle speed data DS (or shifted recording vehicle speed data DSS) to the address specified by the graph end address (321), executes steps 313 and 314, and returns. Further, in step 311, if the data is not a count value, 1 is added to the address specified by the graph end address, the number of times the same vehicle speed is written to that address (322), and step 313 is performed.
, 314 and return.

In the above operation, when the vehicle speed Sm exceeds the data recording upper limit value (DS > Sm), the shift mode is switched to, and when the vehicle speed does not exceed the upper limit value (DS ≦Sm),
Although we have explained not to switch the mode, if the mode switching becomes frequent and causes inconvenience, the relationship DS ≦Sm and Sn slightly lower than Sm (Sm>Sn, for example, Sm=8
0 km/h, Sn=70 km/h) and the relationship of DS≦Sn is established, the shift mode may be switched.

The updating process of the graph end address and graph start address performed in steps 202 and 314 will be further explained with reference to FIG. First, by recording the vehicle speed and time data, 1 is added to the address data of the graph end address and graph start address (400
), determines whether the first round flag is 0 (401), returns if it is 0, and if it is not 0, the graph end address is R.
Determine whether the final address Nm of the recording area of the AM card 12 has been exceeded (GEA>Nm) (402), and if so, set the graph end address to the first address No. of the recording area (403) and return. If not, determine whether the graph start address has exceeded the above address Nm (GSA>Nm) (404), and if not, return; if it has, set the graph start address to the above address No. (405) and returns.

In this way, the preset recording area of the RAM card 12 contains the first address N.
o to the final address Nm, the vehicle speed data read in every sampling period and the operation data of so-called time data read from the clock section 10c for the start of travel or continuous recording delimiter processing are sequentially recorded, as well as the graph end address and The graph start address is updated, and if either of the updated addresses exceeds the final address Nm, it is returned to the first address number and sequentially recorded again, and the operation data is repeatedly recorded in the same recording area. The latest operation data within a predetermined period of time will be recorded. Therefore, the operation data recorded in the preset recording area of the RAM card 12 may become reversed over time, but since the operation data is recorded while updating the graph end address and graph start address, When outputting by an external computer processing device (not shown), the operation data is sequentially read from the RAM card 12 from the graph start address to the graph end address, and continuous analog graph output is possible. Figure 6 shows an example of the above graph output. According to the figure, the vertical axis represents the vehicle speed and the horizontal axis represents the time.
Operation data for the 50 seconds before and after the second is output, and as will be understood from now on, the operation data before and after the time specified by a part of the recording area is the vehicle speed of 0 km/h. It is possible to output graphs in the upward direction in the figure based on the vehicle speed, and in the downward direction in the figure based on the vehicle speed of 0 km/h. This means that when an accident occurs, it is possible to output the operation status immediately before the accident based on the time when the accident occurred, which is a great advantage in that it is possible to output operation data that makes it possible to analyze the accident. Moreover, by setting the enlargement designated area a in FIG. 6, it becomes possible to further enlarge and output the part of the area a, and as illustrated in FIG. It is possible to record the operation status for the 12 seconds before and after the minute (6 seconds), and this detailed graph output makes it easier to analyze the accident and accurately investigate the cause of the accident and take measures to prevent recurrence. will be possible. Furthermore, when recording vehicle speed data, time data is added at the instantaneous sampling period and at the start of travel and at the delimitation of continuous recording, so even if the reference point is set arbitrarily, calculations cannot be made. Processing becomes easy and the time can be printed out along with the graph output. Furthermore, data recording is stopped when the engine key switch is turned off, and time data is recorded when the engine key switch is turned on. It is also possible to output the
By moving the reference point before and after this time change line b, the time can also be displayed on the display, making it possible to determine the parking time. In addition, since vehicle speed data is recorded separately for high-speed driving and normal driving, although it is not shown in Figure 6 above, the point of change from high-speed driving to normal driving (or vice versa) is output as a graph. For example, like the time change line b, it is also possible to draw a line and output it, and it is also possible to analyze the driving situation by distinguishing between high-speed driving and regular driving, even in the case of so-called excessive speeding.

[0020]

[Effects of the Invention] According to the present invention, a reverse signal detecting means for detecting whether the reverse switch of the vehicle is turned on or off is provided, and vehicle speed data is recorded by distinguishing between forward traveling and backward traveling based on the output signal of this detecting means. Therefore, even if an accident occurs during operation, it is possible to clearly distinguish whether the accident occurred when the vehicle was traveling forward or backward, and to analyze the operation situation immediately before the accident.

Furthermore, when the engine key switch is turned off, data recording is stopped, and when the vehicle speed data is the same as the previous vehicle speed data, the number of times the same vehicle speed is counted by counting the sampling period is recorded, and when the vehicle speed is at a predetermined value. Since the shifted vehicle speed data is recorded when the value exceeds 1, the vehicle speed data can be recorded over a wide range without increasing the memory capacity even at an instantaneous sampling period.

Furthermore, since a high-speed driving detection means is installed to distinguish and record high-speed driving and normal driving, excessive speeding can be accurately analyzed, allowing accurate understanding of the cause of the accident and prevention of recurrence. Prevention measures can be easily taken, and safe driving managers can accurately provide individual guidance to vehicle drivers.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the basic configuration of the present invention.

FIG. 2 is a flowchart diagram illustrating a data collection operation.

FIG. 3 is a flowchart illustrating a continuous recording delimiter processing operation in FIG. 2;

FIG. 4 is a flowchart diagram illustrating a recording operation of vehicle speed data in FIG. 2;

FIG. 5 is a flowchart illustrating an operation of updating the graph end address and graph start address shown in FIGS. 3 and 4;

FIG. 6 is an exemplary diagram of an output display.

FIG. 7 is an exemplary diagram in which a part of FIG. 6 is enlarged and displayed.

[Explanation of symbols]

1 Vehicle speed data detection means 2 Operation signal generation means 3 Switch signal detection means 4 Engine key switch 7 Reverse switch 8 Reverse signal detection means 10 Data collection processing means 12 Recording means

Claims (3)

[Claims] [Claim 1] A vehicle speed data detection means that counts a pulse signal proportional to the vehicle speed at every instantaneous sampling period and outputs the value as vehicle speed data, and detects and outputs the on/off state of an engine key switch. A switch signal detecting means, a reverse signal detecting means detecting on/off of the reverse switch and outputting the reverse signal detecting means, and the output signals of the respective detecting means are used to perform arithmetic processing on the vehicle speed data and send a write command to the recording means. and a data collection processing means, which is configured to determine whether the vehicle is traveling forward or backward based on the reverse signal detection signal, and to output a write command to the recording means. Data recording method. 2. The data collection processing means is configured to shift the vehicle speed data and send a write command when the vehicle speed data exceeds a predetermined vehicle speed. Vehicle operation data recording method. 3. A high-speed travel detection means that outputs an output during high-speed travel is connected to the data collection processing means, and a command to write vehicle speed data that distinguishes between high-speed travel and normal travel is sent out. The vehicle operation data recording method according to claim 1 or claim 2.