JPH02100192A - Travel recorder for automobile - Google Patents

Abstract

PURPOSE:To electronically record the crash accidents of automobiles and the traveling states of the automobiles set right before the accidents by using a microcomputer to store periodically the traveling states of automobiles into a replaceable FIFO memory for several minutes or longer. CONSTITUTION:A microprocessor mup 1 which started its working with the fixed cycle interruption signal received from a timepiece 4 reads the time of the timepiece 4 and stores this time in a prescribed address of a random access memory RAM 3. Then the mup 1 reads the output values of sensors 7A-7F for the impact, the speed, the brake position, the position of the direction indicator, and the steering wheel angle respectively and stores these values successively in the prescribed addresses of the RAM 3. Thus it is possible to record the time point of the automobile crash accident and the traveling states of the automobile set before and after the accident including the actions of the driver. These records are carried out in terms of an electronic circuit and can serve as the objective evidence.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is an automobile driving recording device, and in particular, realizes an accurate driving record when a car accident occurs, and objectively handles insurance operations associated with the occurrence of a car accident. The present invention relates to a travel recording device that can be effectively used for rapid processing.

[Conventional technology]

Car users should take precautions to protect themselves in case of an accident.

Are you compulsorily or voluntarily enrolled in property, vehicle, etc. insurance? When we look at cases where vehicle accidents occur, which is the most common type of automobile accident, based on the application of the two drivers concerned, an employee or agent of the insurance company in question conducted an interview or an actual vehicle inspection. We are dealing with the accident.

In handling this accident, if the claims of both drivers are in agreement, the accident handling will proceed fairly smoothly, but if the claims of both drivers conflict, the accident handling will be delayed due to the difficulty of verification. This not only puts a mental burden on both parties, but also increases the insurance company's accident handling costs.

[Problem to be solved by the invention]

Traditionally, the only evidence available at the time of an accident is the claims (memories) of both drivers and the two cars involved, that is, there is no data from before or after the accident, so there is a lack of evidence to objectively handle the accident. There is a problem.

Therefore, an object of the present invention is to provide a recording device capable of recording data before and after an automobile accident occurs.

[Means to solve the problem]

In order to solve the above-mentioned problems, a driving recording device that electronically stores various data is installed in the car, and this driving recording device records the speed, brake position, etc. sampled at regular intervals.
A group of data such as the condition of the steering wheel, the position of the direction indicator, and the impact (output of the impact sensor attached to the vehicle body, front bumper, rear bumper, etc.) is collected for the required time using a first-in, first-out method ( First In F
irst out method: a method in which the latest data is always recorded).

[Effect]

Vehicle speed and brake position sampled at regular intervals (usually about 0.1 seconds) using a driving recorder.

A group of data such as the position of the turn signal, the state of the steering wheel, and the immediate impact are recorded for the required time, and the driving state of the car at the time when the impact occurs and before and after that, including the driver's actions, is recorded. This recording is performed electronically, so
It can be used as extremely objective evidence.

〔Example〕

FIG. 1 shows a block diagram of the travel recording device. 1 is a microprocessor (μp) that reads values such as speed and impact at regular intervals and stores them in the memory 5; 2 is a read-only memory (ROM) that holds programs for μp1; and 3 is a run in the work memory of μP1. A signal is issued. 5 is F
irst In First Out's driving record memory, which is removable. For this reason, a battery is built-in to prevent information from being lost. 6 is an input section that takes in sensor signals such as speed, impulse *, brake position, etc.
It consists of a preset counter, analog input, reversible counter, etc.

The operation of μp1 will be explained. μp1, which starts operating in response to a periodic interrupt signal from the clock 4, first reads the time from the clock 4 and stores it at a predetermined address in the RAM 3. Next, read the output values from each sensor 7A to 7F for impact, speed, brake position, direction indicator position, and steering wheel angle υ, RAM3
are sequentially stored at predetermined addresses. An example of these storage states is shown in FIG. In other words, start directly at the time of impact.

The order is speed, brake position, turn signal position, steering wheel angle, and reserve. When all sensor values are stored, μp
1 sequentially transfers the time and sensor values stored in the RAM 5 to the travel recording memory 5.

FIG. 3 shows an example of the configuration of the memory 5. This memory has 1~
Since there are 4096 blocks, if one block is 16 bytes, the total memory capacity is 64 bytes. At first, when the car starts moving and recording begins, data is written to the memory 5 from the 1st block, and when it is written up to the 4096th block, it is written again from the 1st block. ing. The address (indicated by a ">" mark in FIG. 3) to which the latest data is to be written is stored in μp1. Increase the capacity of memory 5 to 40
If there are 96 blocks and samples are taken every 0.15, then
It is possible to record approximately 410 seconds (just under 7 minutes). this is,
This can be said to be sufficient time before and after the accident occurred. Even if the time resolution is increased and sampling is performed every 0.053, approximately 3.5 minutes can be recorded, which is sufficient for the amount of accident recording. Further, the memory 5 is of a cassette type and can be removed. This is so that it can be carried around as evidence in the event of an accident. Although not directly related to the present invention, the operation check of the memory 5 is performed by μp1.
This function is executed by writing and reading when the engine is started, and displays whether it is normal or abnormal as necessary.

Next, the acquisition of sensor signals will be explained.

As the speed sensor 7A, for example, a so-called photoelectric speed sensor that converts the rotation of the transmission into a vehicle speed pulse using a photointerrupter is used. The vehicle speed pulse is measured by a pulse counter, but in order to reduce the calculation processing of μp1, the pulse counter is configured to be reset to zero each time μp1 reads a mutter. The bit length of the counter is 8 bits (-
1 byte) is sufficient. The brake sensor 7B uses the brake pedal operation detection signal (rear indicator light 0N10FF signal) because the important point is whether or not the driver operated the brake pedal and the time. This signal is 0
Since it is an N10FF signal, the digital input circuit (Dl
), the state value of the υ brake pedal (°゛1”/″′0#
) will be loaded. Since the important point is when and in which direction the direction indicator sensor 7C is operated, the direction indicator status signal is read by the digital input circuit Di.

Although standard automobiles are not currently equipped with the steering wheel angle sensor 7D, it can be realized by mounting a rotation sensor on the steering wheel shaft that detects rotation in both directions. The rotation sensor is magnetic, and the output is a pulse signal. A magnetic rotation sensor has a permanent magnet attached to the handle shaft, and its movement is detected by a magnetic detection element attached to the fixed side. To detect the direction, two magnetic detection elements are installed (A, B sensor, the mounting angle of both detection elements is 1/2 of the mounting angle of the permanent magnet.
This can be achieved by setting it slightly smaller.

In other words, it is possible to determine whether the pulse train is in the order of A-+B or B-+A. Also, the steering wheel angle is ``0'' when the steering wheel is in the center position, and clockwise rotation is positive.
Measure with a reversible counter that takes counterclockwise rotation as negative. μ
p1 reads the state value of this steering wheel angle at regular intervals. If a signal of 20 pulses is generated for one rotation, and the maximum rotation of the handle is 3 rotations, this will be ±60 pulses, so 1 byte including the sign is sufficient.

The impact is detected by impact needles (acceleration sensors) 7E and 7F.

The impact is measured using two acceleration sensors attached to the chassis, one in the direction the car is traveling and one in the direction perpendicular to it.

In order to precisely identify the location where the impact occurs, it is recommended to install it at two locations, for example, the front right and the rear left. Acceleration sensors include those using piezoelectric elements and those using differential transformers.

〔Effect of the invention〕

According to this invention, a microcomputer is used to periodically determine the driving state of the car, i.e., speed, brake position,
The angle of the steering wheel, the position of the direction indicator, the shock wave, etc. - the first in which can read the data of the group and replace the direct.
Since the configuration is such that the data can be stored in the first-out memory for several minutes or more, it is possible to electronically record the driving conditions at the time of a single collision accident and immediately before. As a result, objective data at the time of the accident can be obtained, which has the effect of allowing the accident to be handled objectively. Furthermore, since the memory mentioned above was configured to be replaceable,
It also has the effect of dramatically reducing the amount of time spent on-site and in front of actual objects when dealing with accidents. This is extremely effective in objectively and quickly processing insurance operations associated with the occurrence of automobile accidents, and has great economic effects.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram for explaining an example of automobile travel record data, and FIG. 6 is a schematic diagram showing an example of the configuration of a travel record memory. Code explanation 1... Microprocessor (μp), 2...
...ROM, 3...RAM, 4...
Time counting unit, 5...Memory for driving record,
6...Sensor input unit, 7A...
Speedometer, 7B... Brake sensor, 7C...
...Direction indicator sensor, 7D...Steering wheel angle sensor, 7E. 7F...Impact needle.

Claims (1)

[Claims] 1) An automobile includes a microcomputer, a time counting unit, a driving record memory, a sensor input unit that inputs outputs from various sensors of the automobile, and a read-only computer that stores processing programs of the microcomputer. The microcomputer is equipped with a memory, and the microcomputer uses a fixed periodic pulse transmitted from the time counting unit as a trigger to at least record the running speed of the vehicle at each point in time, the state of the brake pedal,
A driving recording device for an automobile, characterized in that the condition of the steering wheel, the driving direction of the automobile, and each acceleration in a direction perpendicular thereto are measured, and these counted values are stored in the driving recording memory in chronological order. 2) The driving recording device for an automobile according to claim 1, wherein the driving recording memory stores a group of data collected at regular intervals in a chronological manner in a first-in first-out manner. Vehicle driving recording device. 3) A driving recording device for a motor vehicle according to claim 1 or 2), wherein the driving recording memory is configured to be replaceable.