JPH1035546A - Method and device for recording/reading traveling condition of traveling automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always record driving conditions including a car speed from a time of several seconds to several tens of seconds before the current time of a traveling car to the current time, a steering wheel operation state, a brake condition, the size and direction of impacts and an air bag operating time and to read and display the recorded driving condition later. SOLUTION: A driving condition including the car speed of a traveling automobile, a steering wheel operation state, or a brake operation condition is detected by a sensor section 1, a detected signal is fetched into the one-chip microcomputer 13 of a microcomputer section 3 from an interface section 2, a car speed signal from a timer/counter unit 11, an acceleration signal caused by impacts, an air bag operating signal, a steering wheel signal, an signal, an axle signal, a direction indicating signal and a brake signal from a port 12, these are recorded in a given time nonvolatile RAM 14 for last several seconds or several tens of seconds, the bits of information thereof are fetched in the flash memory 19 of a separately provided reading device, and the driving condition including a car speed for a time of several seconds to several tens of seconds before 4 to 6 seconds after the stop of the car, a steering wheel operation state, or the direction and size of impacts is displayed on the display 23 of a driving condition analyzer 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle speed for several seconds to several tens of seconds, from four to six seconds after a vehicle stops due to an accident in a running vehicle, acceleration due to impact and its direction,
The present invention relates to a method of recording operating conditions such as a steering wheel operating condition, an accelerator operating condition, an ON / OFF state of a direction indicator, a brake operating condition, and an air bag operating condition, and reading and displaying the recorded items.

[0002]

2. Description of the Related Art An automobile is equipped with a speedometer, a tachometer, and the like, so that a driver can know the speed of his or her own vehicle while driving and the rotation speed of an engine. However, these devices can know the speed of the car and the rotation speed of the engine during traveling, but do not record them, so that the speed at the time of an accident or the like cannot be known as a recorded matter later. Further, depending on the type of vehicle, a tachograph is further provided, and changes in speed during traveling are recorded in a time-series graph. This device can know the speed change state while traveling at a later time, but the speed change of the car in a short time of several seconds to tens of seconds,
It was not possible to obtain detailed data on changes in driving conditions, such as changes in acceleration and its direction due to the impact of the accident, steering directions, operating times of airbags, or brake operating conditions. By the way, when a running car causes an accident, a driver performs a driving operation for avoiding an accident within a short time of several seconds from the discovery of a driving obstacle to the occurrence of an accident.
The car stops several seconds to several tens of seconds after the accident. However, the change in the speed of the car for several seconds to several tens of seconds, including the driving operation time for avoiding the accident and the time until the car stops after the occurrence of the accident, the change in acceleration and its direction due to the impact of the accident, the steering wheel operation There has been no device that knows the change of the driving situation such as the situation, the operation time of the airbag, and the brake operation situation after the accident.

[0003] When an accident occurs in a car, it is extremely important to find out the cause of the accident by knowing the change in the driving conditions of the car, for example, the speed of the car at the time of the accident. This is a situation where judgment is made based on traces on the road surface at the time of tire slip, breakage of a car or surrounding objects, and hearing from a driver or a witness. However, the trace on the road surface when the tire slips due to the sudden braking is not constant or ambiguous due to the road surface condition at that time, for example, the condition of fine rain or asphalt, and accurate data could not be obtained. Also,
When the car stops instantaneously due to a collision and wrecked without any braking due to inattentive driving or drowsy driving, the hand of the speed meter does not return to 0 and it points to the speed position, The speed indicated by the vehicle speed may be the vehicle speed at the time of the collision. However, in this case, there is no evidence that the speedometer hand truly points to the vehicle speed immediately before the collision without returning, and is not necessarily authoritative. Furthermore, the number of vehicles equipped with an anti-lock brake system, so-called ABS, is increasing in recent vehicles. In the case of vehicles equipped with this system, traces of tire slip due to sudden braking do not adhere to the road surface. For this reason, it may not be possible to analyze an accident occurrence situation due to such a slip trace. Also, hearing from drivers or witnesses was not reliable.

[0004] The inventors of the present invention have proposed a vehicle speed several seconds to several tens of seconds before the current time, for example, 15 seconds before the current time, the vehicle speed, the acceleration due to the impact of the accident, the direction to which the impact was applied, and the steering wheel. Always record the operation status such as operation status, air bag operation time and brake operation status, update the recorded information over time, if the car stops due to collision etc., the first equipment stop condition, That is, immediately after any of the following conditions occurs: when the acceleration value calculated from the speed signal indicates a value equal to or higher than a certain level, when the acceleration sensor indicates a value equal to or higher than a certain value due to an impact, or when an airbag activation signal is generated. Alternatively, stop recording after 1-2 seconds from the occurrence of the same condition, do not perform recording after that, and always update only the record for several seconds to several tens of seconds retroactive from the collision Save Te, a method and its implementation device displays reading these records later time already Hei 7-
291805 or Japanese Patent Application No. Hei 8-126551.

[0005] By the way, according to the invention of the prior application, it is possible to grasp the situation at the time of an accident of a running car. There is such a problem. In particular, the cause of the accident is not always 100% problematic on the perpetrator side. Therefore, it is necessary to know as many driving situations as possible for an accident investigation.

[0006]

The problem to be solved by the present invention is that the speed of a running car is several seconds to several tens of seconds before the current time, for example, 15 seconds before the current time to the current time, and the acceleration due to the impact of an accident. And the operating conditions such as the direction of the impact, the steering wheel operation status, the air bag operation time and the brake operation status, and in addition to these, the accelerator operation status and the on / off status of the turn signal are always recorded. The recorded information is updated as time passes, and if the car stops due to a collision or the like, the first equipment stop condition, that is, when the acceleration value calculated from the speed signal indicates a value equal to or higher than a certain level, the acceleration sensor due to impact Stops recording 4 to 6 seconds after either of the conditions occurs when the value indicates a certain value or more, or when the air bag operation signal is generated, and thereafter Without performing the record, 4 from the time of collision
Only records for a few seconds to several tens of seconds that are traced back after 6 seconds have elapsed, and these records are read out at the accident site to a reading device separate from the accident vehicle and recorded again, and then these records are read out and recorded at a later time. A reading device or a reading device for a vehicle speed condition for several seconds to several tens of seconds immediately before stopping, an acceleration condition due to an impact at the time of an accident, a steering wheel operation condition, an accelerator operation condition, a brake operation condition, a direction indicator operation condition, and an airbag operation condition. An object of the present invention is to provide a method and an apparatus for displaying on a display 23 of a personal computer or printing out by a printer 24 of a separate driving situation analyzing apparatus.

[0007]

According to the first aspect of the present invention, there is provided an accident detecting means for detecting a vehicle speed of a traveling vehicle as a vehicle speed signal with a vehicle speed sensor and receiving the vehicle speed signal in a front-rear direction and a left-right direction. Acceleration sensors that detect the impact at each time are detected as acceleration signals by the acceleration sensors directed in each direction, the air bag operation status at the time of accident is detected as the air bag activation signal by the air bag activation sensor, and the operation status of the steering wheel is detected by the steering wheel position sensor The signal is detected as a signal, the operation status of the accelerator is detected as an accelerator signal by the throttle position sensor, the on / off status of the direction indicator is detected as a direction instruction signal from the turn signal lamp circuits of the left and right direction indicators, and further, the brake operation is performed. The condition is detected from the brake lamp circuit as the brake lamp voltage as a brake signal. Each signal obtained by the detection is input to the interface unit, and the vehicle speed signal, the acceleration signal due to impact and the accelerator signal are respectively amplified and shaped in the interface unit, the steering wheel signal is amplified and shaped or voltage level converted, and the air bag activation signal is After signal conversion to microcomputer input enable signal, and turn signal and brake signal respectively to voltage level conversion, vehicle speed signal from timer / counter unit, acceleration signal due to impact, air bag activation signal, steering wheel signal , The accelerator signal, the direction signal and the brake signal are respectively taken into the one-chip microcomputer from the ports, and these signals are grouped and recorded in the non-volatile RAM for a certain period of time, and the last few seconds to several tens of seconds are always recorded. Update the vehicle speed signal 4 to 6 from when any one of the following conditions occurs: when the acceleration value calculated from the calculated value indicates a value equal to or more than a certain level, when the acceleration signal indicates a value equal to or more than a certain value due to an impact, or when an airbag activation signal is generated. After a second, the recording operation is stopped, the subsequent recording is stopped, and only the recording for the last few seconds to several tens of seconds is stored, and the information stored in the nonvolatile RAM is used for security of a reading device separate from the traveling vehicle. All the above information on the vehicle running conditions before and after the occurrence of the accident is read by a one-chip microcomputer of the reading device having a release function, and temporarily recorded in a flash memory or a battery backup memory of the reading device. Stop recording operation from chip microcomputer to personal computer of separate operating condition analysis device Display or print out the vehicle speed status for the last few seconds to several tens of seconds, the acceleration status due to the impact at the time of the accident, the steering wheel operation status, the accelerator operation status, the brake operation status, the turn signal operation status, and the airbag operation status. This is a method for recording and reading out a traveling state of a traveling automobile.

According to the second aspect of the present invention, a vehicle speed sensor 4 for detecting a vehicle speed of a traveling vehicle, an acceleration sensor 7 for detecting a longitudinal impact and a lateral impact in the event of an accident, an air bag operation detecting sensor 8, and a steering wheel operating condition A sensor unit comprising a steering wheel position sensor 5 for detection, a brake lamp voltage extracting circuit 6 of a brake lamp circuit, a throttle position sensor 9 for detecting the operation state of the accelerator, and a turn signal lamp circuit 10 for detecting the operation state of the left and right direction indicators. 1, a circuit for amplifying and shaping a vehicle speed signal from the sensor unit, a circuit for amplifying and shaping an acceleration signal due to an impact, a signal conversion circuit for converting an airbag activation signal into a microcomputer input enable signal, and a circuit for amplifying and shaping a steering wheel signal or a voltage level conversion circuit And brake signal voltage level conversion circuit and accelerator signal amplification and shaping circuit An interface unit 2 comprising a voltage level conversion circuit for a winker signal, a timer / counter unit 11 for obtaining a vehicle speed signal obtained from the interface unit 2, an acceleration signal due to an impact, an airbag operation signal, a steering wheel signal, a brake signal, and an accelerator signal; A port 12 for inputting a winker signal from the interface unit 2, a vehicle speed signal converted by the timer / counter unit 11, an acceleration signal obtained from the interface unit 2 via the port 12, an airbag activation signal, a steering wheel signal, and a brake signal And the accelerator signal and the turn signal are recorded as a set, and when the acceleration value calculated from the vehicle speed signal due to a collision indicates a value equal to or higher than a certain level, when the acceleration signal indicates a value equal to or higher than a certain value due to an impact, or when air Bag activation signal is issued A control program for stopping the recording operation 4 to 6 seconds after the occurrence of any of the above conditions, stopping the subsequent recording, and updating and saving only the last few seconds to several tens of seconds of recording. A vehicle mounted on a vehicle, comprising a one-chip microcomputer 13 having a built-in memory, a nonvolatile RAM 14 for controlling the recording of the one-chip microcomputer 13, and a microcomputer unit 3 having a security lock function for preventing abuse of the recording. It is an operation status recording device.

According to the third aspect of the present invention, the security release function 18 for releasing the security lock of the microcomputer unit of the driving condition recording device mounted on the vehicle, and the flash for temporarily recording the read information on the driving condition of the traveling vehicle. A personal computer of a memory 19 or a battery backup memory, an operation of taking out driving state information recorded in the flash memory 19 or the battery backup memory and displaying or printing out the information on a display 23 or a printer 24 or a separate operation state analyzing device 21 A one-chip microcomputer 20 containing a control program for controlling transfer to the
The information on the vehicle operation before and after the occurrence of the accident recorded in the microcomputer of the automobile is read out from the microcomputer of the driving condition recording device mounted on the automobile, and all the information on the operation of the vehicle before and after the occurrence of the accident is stored in the flash memory 19 or the battery backup memory. The data is temporarily read from the flash memory 19 or the battery backup memory at a later time, and the data is transferred to the personal computer 22 of the separate operating condition analyzer 21 for a few seconds or several seconds immediately before the recording operation of the traveling vehicle is stopped. The vehicle speed status for 10 seconds, the acceleration status due to the impact at the time of the accident, the steering wheel operation status, the accelerator operation status, the brake operation status, the direction indicator operation status and the airbag operation status are displayed or printed out. Description of driving situation in the means of item 2 In combination with apparatus a read apparatus used.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the block diagram shown in FIG. In FIG. 1, reference numeral 1 denotes a sensor unit in the apparatus of the present invention. The sensor unit 1 includes a vehicle speed sensor 4 for detecting a vehicle speed of a traveling vehicle, a handle position sensor 5 for detecting a steering operation state, and a brake lamp for extracting a braking operation state. A voltage extraction circuit 6, an acceleration sensor 7 for detecting a change in acceleration due to the impact of the front-rear and left-right accidents and the direction of the impact, an airbag operation sensor 8, a throttle position sensor 9 for detecting an operation state of an accelerator, and a direction indication It comprises a turn signal lamp circuit 10 for sensing the operation state of the device. The vehicle speed sensor 4 is, for example, an axle or a speedometer outlet,
That is, a permanent magnet attached to a disk that rotates together with the gear meshed with the transmission gear is combined with a Hall element to obtain an electric signal representing the vehicle speed, or a photo interrupter is provided in a slot periodically cut into a disk. The electric signals are obtained in combination, and these signals are obtained as periodic signals. The handle position sensor 5 for detecting the operation state of the handle is provided with two micro switches for turning clockwise and counterclockwise which are turned on when the handle is moved by a certain angle or more. Alternatively, a signal indicating whether the vehicle is traveling straight ahead is obtained. Brake lamp voltage extraction circuit 6 for detecting brake operation status
Is a circuit for extracting the voltage applied to the brake lamp by the action of the brake switch when the brake is applied.
The acceleration sensor 7 for detecting the change in acceleration due to the impact of the front-rear and left-right accidents and the direction of the impact comprises an acceleration sensor for the front-rear direction and an acceleration sensor for the left-right direction. Signals obtained from the respective acceleration sensors are combined into a vector by the one-chip microcomputer 13 of the microcomputer unit 3 at the subsequent stage, and the magnitude and direction of the impact received from all directions, that is, front, rear, left and right and oblique directions are detected. The air bag operation sensor 8 includes a sensor for detecting an electric signal from the detonating device at the time of collision of the air bag or a vibration sensor for detecting explosion vibration at the time of collision of the air bag installed in the air bag storage section. The throttle position sensor 9 is a sensor that senses the state of depression of the accelerator based on the movement position of the throttle. The turn signal lamp circuit 10 for sensing the operation state of the turn signal senses the on / off state of the left and right turn signal lamp switches.

Reference numeral 2 denotes a microcomputer interface unit. Here, the vehicle speed signal composed of the periodic signal obtained by the vehicle speed sensor 4 is amplified and shaped so that the detection signal obtained by the sensor unit 1 can be input to the subsequent microcomputer unit 3.
The timer / counter unit 11 takes the data into the microcomputer unit 3. The on / off signal of the switch indicating the operation of the steering wheel detected by the steering wheel position sensor 5 is amplified or converted into a high or low level of the voltage, and the brake operation voltage taken out from the brake lamp voltage take-out circuit 6 is converted into a voltage level so as to be an appropriate voltage. I do. Further, the acceleration signal detected by the acceleration sensor 7 which detects the acceleration due to the impact at the time of the accident is amplified and shaped, and the airbag signal from the airbag operation sensor 8 which detects the operation state of the airbag is converted into a signal to detect the operation state of the accelerator. The accelerator signal from the throttle position sensor 9 is amplified and shaped, and the turn signal from the turn signal lamp circuit 10 which senses the operation state of the turn signal is converted into a voltage level. These signals are sent from the port 12 of the microcomputer section 3 to the microcomputer section. Take in 3.

The microcomputer unit 3 processes each signal from the interface unit 2 and writes and saves it in a nonvolatile RAM.
The ALU of the microcomputer unit 3 includes a one-chip microcomputer 13 having a built-in security lock function for securing a control program read out when necessary and stored information and the above-mentioned nonvolatile RAM 14 for recording these signals.
Is an arithmetic logic unit 15. As described above, in the microcomputer section 3, the vehicle speed signal from the interface section 2 is captured by the timer / counter unit 11 as indicated by an arrow, while the steering wheel signal, the acceleration signal, the accelerator signal, the brake signal, the airbag signal, and the turn signal are transmitted from the port 12. The data is read by the one-chip microcomputer 13 and written into the nonvolatile RAM 14. The two acceleration signals, front and rear and left and right, respectively, due to the impact of the accident are processed by the microcomputer 13 and vector-combined to determine the magnitude and direction of the impact at the time of the collision and recorded in the nonvolatile RAM 14. The nonvolatile RAM 14 may be a flash memory or a battery backup RAM. A vehicle speed signal to be written into the nonvolatile RAM 14, a handle signal of a handle operation condition, a brake signal of a brake operation condition, an acceleration signal due to an impact of an accident, an accelerator signal of an accelerator operation condition, an air bag operation signal indicating an air bag operation condition and a direction. The turn signal indicating the operation state of the indicator is grouped and recorded in the non-volatile RAM 14 for a certain period of time, and the last several seconds to several tens of seconds are always updated. When the acceleration value calculated from the vehicle speed signal indicates a value equal to or higher than a certain level, when the acceleration sensor indicates a value equal to or higher than a certain value due to an impact, or when an airbag activation signal is generated, After 4 to 6 seconds, the recording operation is stopped, the subsequent recording to the non-volatile RAM is stopped, only the last few seconds to several tens of seconds are stored, and the last few seconds to several tens of seconds are always recorded. A microcomputer is programmed to save the data. In addition, the signals from the front, rear, left and right acceleration sensors are used to detect vibrations caused by separate front, rear, left and right shocks at the time of a vehicle collision with separate acceleration sensors, and that the magnitude of one of the detected values is a certain value or more. When the value reaches, the recording operation is stopped. At that time, the time difference between the front, rear, left and right impacts is also stored.

Since the nonvolatile RAM is used, the vehicle speed signal, steering operation state, brake operation state, air bag operation state and the like for the last few seconds to several tens of seconds are always provided unless the nonvolatile RAM is destroyed even if the power is turned off in an accident. Acceleration information indicating the direction of operation and the magnitude of impact by combining the front, rear, left and right vectors and the magnitude of the impact, and the operation status of the accelerator and the operation status of the left and right direction supports from the left and right turn signal lamp circuits can be saved according to the throttle position. This enables detailed analysis of vehicle operation information before and after a collision and how to apply a shock.

Reference numeral 17 denotes a reading device, which is a microcomputer unit 3
Is a device for connecting the flat cable 16 or the like from the connector 15 of the microcomputer unit 3 and reading out the record of the driving operation status of the traveling vehicle stored in the nonvolatile RAM 14.
The reading device 17 includes a security release function 18 for releasing a security lock provided to prevent unauthorized reading of the record of the microcomputer unit 3, a flash memory 19 for temporarily writing and storing information read from the microcomputer unit 3, The information is stored in the flash memory 19 once and read out again by the one-chip microcomputer 20, and the information is stored in the flash memory 19. The information is displayed on the display 23 of the computer 22 or printed out by the printer 24.

The reading device 17 is a portable type separate from the traveling vehicle, and is separately carried by an investigative agency for investigating accidents.
In the event of an accident, bring the device to the site, connect the readout device 17 to the connector 15 of the one-chip microcomputer 13 of the microcomputer unit 3 of the accident vehicle, activate the security release function 18 of the readout device 17, and The data is read out by the chip microcomputer 20, temporarily recorded in the flash memory, and brought back from the site.
As described above, since the security lock function is provided in the microcomputer unit 3 of the in-vehicle apparatus of the present invention, the security lock function is provided so that only the investigating organization or the investigating organization can release the security lock, thereby preventing the alteration of records of ordinary people. . On the other hand, the data recorded in the non-volatile memory of the microcomputer is always updated and shifted except for the stoppage of the equipment due to a collision accident.
Since they disappear sequentially in a short time, they cannot be used for general speed control.

The microcomputer unit 3 of the apparatus according to the present invention is placed in a sturdy box and wrapped with a noncombustible material to protect the vehicle from fire due to a collision so that the stored data is not erased.

[0017]

As described above, according to the present invention, when a running vehicle is suddenly stopped due to an accident or the like, 4-6 hours after the stop.
Seconds or tens of seconds from the time after the vehicle, the magnitude and direction of the impact due to the collision, the operating state of the airbag,
The operating conditions of the driver, such as the operating status of the steering wheel, the operating status of the brake, the operating status of the accelerator, and the operating status of the turn signal, are recorded in memory, and the data can be read out later. Has excellent effects that can be pursued. Since the situation is recorded for 4 to 6 seconds after the vehicle stops, data useful for analyzing the situation not only immediately before the accident but also immediately after the accident is obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sensor part 2 Interface part 3 Microcomputer part 4 Vehicle speed sensor 5 Handle position sensor 6 Brake lamp voltage extraction circuit 7 Acceleration sensor 8 Air bag operation sensor 9 Throttle position sensor 10 Turn signal lamp circuit 11 Timer / counter unit 12 Port 13 One chip microcomputer 14 Non-volatile RAM 15 ALU 16 Flat cable 17 Reading device 18 Security release mechanism 19 Flash memory 20 One-chip microcomputer 21 Operating condition analyzer 22 Personal computer 23 Display 24 Printer

Claims (3)

[Claims] A vehicle speed sensor detects a vehicle speed of a traveling vehicle as a vehicle speed signal, and detects an impact at the time of an accident received from the front-rear direction and the left-right direction as an acceleration signal at an acceleration sensor directed to each direction. The bag operation status is detected as an air bag operation signal by an air bag operation sensor, the steering wheel operation status is detected as a steering wheel signal by a steering wheel position sensor, the accelerator operation status is detected as an accelerator signal by a throttle position sensor, and a direction indicator ON / OFF status is detected as a direction indicating signal from the turn signal lamp circuits of the left and right direction indicators,
Further, the brake operation state is detected from a brake lamp circuit as a brake lamp voltage as a brake signal, and each signal obtained by these detections is input to an interface unit. In the interface unit, a vehicle speed signal, an acceleration signal due to an impact, and an accelerator signal are input. Amplify and shape each, handle signals are amplified and shaped or converted to voltage level, air bag activation signals are converted to microcomputer input signals, and turn signal and brake signals are each converted to voltage level, then vehicle speed signal. From the timer / counter unit, as well as the acceleration signal from the impact,
Air bag activation signal, steering wheel signal, accelerator signal,
Direction signal and brake signal are sent from each port.
Each one is taken into a one-chip microcomputer,
When a set of these signals is recorded in the non-volatile RAM for a certain period of time, the last several seconds to several tens of seconds are always recorded and updated, and when the acceleration value calculated from the vehicle speed signal indicates a value equal to or higher than a certain level, When the acceleration signal shows a value equal to or more than a certain value due to an impact or when an air bag activation signal is generated, the recording operation is stopped 4 to 6 seconds after the occurrence of any of the conditions, and the subsequent recording is stopped. And save only the last few seconds or tens of seconds of records,
The information stored in the AM is read out by a one-chip microcomputer of the readout device having a security release function of a readout device separate from the traveling vehicle, and reads all the above information about the vehicle running conditions before and after the occurrence of the accident. Recorded temporarily in the battery backup memory, and later from the one-chip microcomputer of the reading device to the personal computer of the separate operating condition analysis device, the vehicle speed status for several seconds to several tens of seconds immediately before the stop of the recording operation, due to the impact at the time of accident A method for recording and reading a traveling state of a traveling vehicle, comprising displaying a display or printing out an acceleration state, a steering operation state, an accelerator operation state, a brake operation state, a turn signal operation state, and an airbag operation state. 2. A vehicle speed sensor 4 for detecting a vehicle speed of a traveling vehicle, an acceleration sensor 7 for detecting a front-rear impact and a left-right impact in the event of an accident, an airbag operation detecting sensor 8, and a handle position for detecting a handle operation situation. Sensor 5
And a brake lamp voltage extracting circuit 6 of a brake lamp circuit, a throttle position sensor 9 for sensing the operation state of the accelerator, and a blinker lamp circuit 10 for sensing the operation state of the left and right direction indicators. Amplifying and shaping circuit for vehicle speed signal, amplifying and shaping circuit for acceleration signal due to impact, signal converting circuit for air bag activation signal to microcomputer input enable signal, amplifying and shaping for steering wheel signal or voltage level converting circuit, and voltage level converting for brake signal An interface unit 2 comprising a circuit, an accelerator signal amplifying and shaping circuit, and a blinker signal voltage level conversion circuit; a timer / counter unit 11 for transmitting a vehicle speed signal obtained from the interface unit 2; Handle signal and brake signal A port 12 for inputting an accelerator signal and a blinker signal from the interface unit 2; a vehicle speed signal converted by the timer / counter unit 11; an acceleration signal due to an impact obtained from the interface unit 2 via the port 12; When the acceleration signal calculated from the vehicle speed signal indicates a value equal to or higher than a certain level due to a collision, and the acceleration signal indicates a value equal to or higher than a certain value due to a collision, the brake signal, the accelerator signal, and the turn signal are recorded as a set. Or the recording operation is stopped after 4 to 6 seconds from the occurrence of any of the conditions when the air bag operation signal is generated, and the subsequent recording is stopped, and only the recording for the last few seconds to several tens of seconds is performed. A one-chip microcomputer 13 having a built-in control program for updating and saving Driving operation status recording device mounted in a vehicle, characterized by comprising a microcomputer unit 3 having a security locking function to prevent misuse of the recording nonvolatile RAM14 and records responsible for the chip microcomputer 13. 3. A security release function 18 for releasing a security lock of a microcomputer section of a driving condition recording device mounted on a vehicle, a flash memory 19 for temporarily recording read information of a driving condition of the traveling vehicle, or a battery backup. Operation for taking out the information of the driving situation recorded in the memory and the flash memory 19 or the battery backup memory and displaying or printing it out on the display 23 or the printer 24 or the personal computer 22 of the separate driving situation analyzing device 21
The microcomputer consists of a one-chip microcomputer 20 having a built-in control program that controls the transfer to the vehicle. Information about the vehicle operation before and after the occurrence of the accident recorded in the microcomputer of the vehicle is read out from the microcomputer of the driving condition recording device mounted on the vehicle. All the above information about the vehicle operation before and after the occurrence is temporarily recorded in the flash memory 19 or the battery backup memory, and the flash memory
9 or the battery back-up memory, read the data again, and transfer the data to the personal computer 22 of the separate driving condition analysis device 21 for several seconds to several tens of seconds immediately before stopping the recording operation of the traveling vehicle, and the acceleration due to the impact in the event of an accident. The driving status recording device according to claim 2, wherein the status, the steering operation status, the accelerator operation status, the brake operation status, the direction indicator operation status, and the airbag operation status are displayed or printed out. Readout device to use.