JPS6380386A - Running condition memory - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an apparatus for storing vehicle running conditions such as vehicle running speed and whether or not the brakes are being used.

Records of driving conditions made by such devices are used to analyze the causes of accidents, especially when major collisions occur.

[Technology of technology]

Conventionally, there is a device as shown in FIG. 4 as a device for storing the running state of a vehicle (see Japanese Patent Laid-Open No. 15552/1983).

In the same figure, 1.2, 3, 4.5 are vehicle running speeds,
Running state detection means 6 detects the running state of the vehicle such as brake pressure and steering angle; 6 is running state detection means 1;
7 is a collision detection means for detecting a vehicle collision; 8 is a new storage process in the storage means 6 when this collision detection means detects a vehicle collision; This is a memory stop means that stops the memory. The storage means 6 is supplied with power from the battery 10 when the ignition switch 9 is ON, and sequentially updates and stores the driving state data inputted from the driving state detecting means 1 to 5 in a chronological manner, and the collision detecting means 7. When a vehicle collision is detected, the storage processing in the storage stop means 8 or the storage means 6 is stopped based on the detection result. At this time, the storage means 6 receives power directly from the vehicle controller 10 via the relay 11, and maintains the running state for a predetermined period of time (for example, 5 seconds) immediately before the collision. In order to analyze the cause of the accident, the driving condition data stored in the storage means 6 is read out, and whether or not the brake was pressed immediately before the collision was determined.
All you have to do is analyze how much the handle was turned. Incidentally, in order to detect a collision of a vehicle, in addition to the method of detecting a frontal collision of a bumper using a piezoelectric element or the like, it is also possible to detect whether the deceleration of the vehicle is equal to or higher than a predetermined value.

[Problem that the invention seeks to solve]

By the way, in such a conventional device, when the collision detection means 7 detects a collision of a vehicle, the storage means stops storing new data, so it is difficult to analyze the cause of the accident. Even in the event of a minor, unnecessary collision (for example, a simple cartwheel mistake while parking in a garage), further data storage is stopped.As a result, if there is a major collision that requires an analysis of the cause of the accident, it is possible to When such an accident occurs, there is a problem in that driving condition data immediately before the accident cannot be obtained.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to make it possible to reliably save driving state data immediately before the accident when a collision requiring analysis of the cause of the accident occurs.

(Means for Solving the Problems) A driving state storage device according to the present invention includes a driving state detecting means for detecting the traveling state of a vehicle with respect to predetermined detection items, and a driving state detecting means that systematically stores the detection results of the driving state detecting means. In order to solve the above-mentioned problem, the memory stopping means is provided with a storage means for storing data in the vehicle, and a storage stopping means for stopping new storage processing in the storage means when a vehicle collision is detected. New storage processing in the storage means is stopped only when a collision of the vehicle is detected and the vehicle is in a predetermined running state at that time.

[Effect]

According to the present invention, while the vehicle is running, the running state data of the vehicle is always written into the storage means. Then, when a vehicle collision is detected and the vehicle is in a predetermined traveling state at the time of the collision that is assumed to cause a major collision, writing of the traveling state data in the storage means is stopped. After that, the driving state data stored at that point in time remains stored in the storage means. On the other hand, even if a vehicle collides, if the driving condition of the vehicle at the time of the collision is such that it will not lead to a major accident, the operation of the storage means will not be stopped and the data stored in the storage means will continue to be stored. It is updated and rewritten with new vehicle driving state data.

(Example) Hereinafter, the present invention will be described in detail based on the accompanying drawings.

FIG. 1 shows an example of a running condition storage device according to the present invention. In the same figure, 15 is an accelerator pedal;
6 is an accelerator sensor that detects the amount of depression of the accelerator pedal 15; 17 is a brake pedal; 18 is a brake switch that determines whether the brake pedal 17 is depressed; 19 is a vehicle speed sensor that detects vehicle speed; 20 is a vehicle Collision sensors 21 and 22 are a throttle full-open switch and a throttle full-close switch that detect when the throttle is fully open and fully closed, respectively. Incidentally, the collision sensor 20 may be activated to detect a vehicle collision when the sensor contacts something or is pressed. Alternatively, a collision may be detected when the deceleration of the vehicle is rapid and exceeds a certain value. 23 is cpu24
CPU 24 and RAM 25 are a storage device configured mainly of CPU 24 and RAM 25, and various driving state data input while the vehicle is running is written to RAM 25.* CPU 24 and RAM 2
5 normally receives power from the battery 27 via the ignition switch 26, but as soon as the ignition switch 26 is turned on, the relay 28 is activated and receives power directly from the battery 27, allowing it to operate at a specified level. Even if the vehicle collides under the following driving conditions and writing of data in the storage device 23 is prohibited, the driving state data before the collision stored in the RAM 25 at that time is saved after the collision. There is. In this embodiment, the storage stop means is implemented as a function of the CPU 24.

Next, the operation of this device will be explained.

FIG. 2 shows an example of the processing flow of the storage device 23. When the ignition switch 26 is turned on, the operating system (not shown)
This flow is executed every s. The CPU 24 first determines whether the flag 5TOP is set or not.1-1
), if it is not set, proceed to step (1-2), and if it is not set, the process ends. flag 5
TOP is set in a subsequent step (1-11) when storing new driving state data is stopped. Flag 5T
Once OP is set, it will not be cleared, so if this flag 5TOP is set, RA will no longer be cleared at that point.
The driving state immediately before the collision stored in M25 is not updated and is stored as is. Next step (1
In -2), the relay 28 is set to ONt so that it not only receives power through the storage device 23 or the ignition switch 26 but also receives power directly from the battery 27.

Then, in step (1-3), the running status data in the storage register is sequentially rewritten to the next address. In this embodiment, 2 bytes are stored as data for one time, and the storage location is A. 0 to A5° are available, for example AS
O means 50x100ms = data from 5 seconds ago will be saved. In the next step (1-4), the accelerator sensor 16, brake switch 18, throttle fully open switch 21, and throttle fully closed switch 22 are set to 0N-OFF.
The driving state of the vehicle is read, for example, the ON-OFF state of the ignition switch 26, the ON-OFF state of the collision sensor 20, and data from the vehicle speed sensor 19, and the data is stored at the current data storage location.

Store in Ao. In subsequent steps, it will be determined whether or not the vehicle was involved in a collision, and if the vehicle did collide, whether the vehicle was in a state of travel at the time of the collision and whether it would have led to a major accident that would require an analysis of the cause of the accident. . In this embodiment, storage of new data is stopped when the accelerator is fully open at the time of the collision, or when the throttle valve is fully open even though the brake pedal 17 is depressed. Steps (1-5) to (1-10) are used to determine whether the accelerator is fully open and there is a collision, or when the brake is depressed and the throttle is fully open and there is a collision, step (1-11) is performed.
The process ends by setting flag 5TOP. - Once this flag is set, new data will not be stored from the next cycle, and the relay 28 will also be set to 0FFL/
Therefore, even if the ignition switch 26 is turned off, the power to the storage device 23 is not turned off and the data is stored as is. Further, when there is no collision in a predetermined running state, the ignition switch 26 is determined to be ON or OFF (1-12), and when it is ON, the process ends as is, and when it is OFF, the relay 28 is turned OFF and the process ends (1-13).

FIG. 3 illustrates the relationship between the running state of the vehicle and the operation of the storage device. This figure shows a case where the throttle is fully opened at time t1, the vehicle causes a collision in that state, and then the brake is depressed at time t3. In this case, as shown in FIG. 2, the conditions of "fully open throttle and collision" are met, so the CPU 24, which serves as a storage stop means, prohibits storage of new data in the storage device 23 after time t2. Therefore, the RAM 25 stores running state data from, for example, about 5 seconds before time t2 (indicated by time t0). Note that the method for outputting the stored data is not shown in the drawings, or a switch is input to the storage device 23 from the outside, and this signal is used as an output start signal.Once this input is obtained, 16 bits of data are output A at regular intervals. By outputting from A5o to A5o and blinking a lamp, for example, the data becomes readable or 1F. Also,
Read the data into an existing device (such as a personal computer),
A method of automatically reading the data, such as processing the data and printing it out, may also be used.

Furthermore, when implementing the present invention, the conditions for stopping the storage process of new data in the storage device 23 include when the vehicle speed at the time of the collision is higher than a certain speed, or when the ignition switch is turned off immediately before or after the collision. This includes cases where the driving condition at the time of the collision is unnatural, such as in cases where the vehicle is in an unnatural state at the time of the collision. In other words, it is possible to implement various conditions, except in cases where it is assumed that the collision will be just a minor collision.

(Effects of the Invention) As explained above, the driving state storage device according to the present invention is configured to stop storing new driving state data only when a vehicle collides under predetermined driving conditions. Therefore, when a collision occurs that requires analysis of the cause, rather than a collision caused by a simple driving error, it is possible to reliably record and save the driving state data for a predetermined period of time before the collision.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of the driving state storage device according to the present invention, FIG. 2 is a flowchart showing an example of the operation of the driving state storage device according to the invention, and FIG. 3 is a block diagram showing an example of the driving state storage device according to the invention. A flowchart showing an example of the relationship between the operation of such a driving state storage device, and FIG. 4 is a block diagram showing an example of a conventional driving state storage device. 15 - Accelerator pedal 16 Accelerator sensor 17 Brake pedal 18 Brake switch 19 Vehicle speed sensor 20 Collision sensor 21 Throttle fully open switch 22 Throttle fully closed Switch 23--Storage device 24-=CPU (memory stop means) 25-RAM

Claims (1)

[Scope of Claims] A driving state detecting means for detecting the traveling state of the vehicle with respect to predetermined detection items, a storage means for chronologically storing the detection results of the driving state detecting means, and a vehicle collision is detected. In a driving state storage device comprising a storage stop means that sometimes stops new storage processing in the storage means, the storage stop means is configured to stop a new storage process in the storage means when a collision of the vehicle is detected and the vehicle is at a predetermined state at that time. A driving state storage device characterized in that a new storage process in the storage means is stopped only when the vehicle is in a driving state.