JPH01245384A - Data storage - Google Patents

Abstract

PURPOSE:To properly store data relating to a traveling state by providing a data storage with a means for generating a timing signal in each prescribed traveling distance and a means for storing data in synchronizm with the timing signal. CONSTITUTION:When a vehicle speed pulse (a) is inputted to a counter 1 at the time of traveling at 100km/h, traveling distance data (b) are outputted to a data writing circuit 3. The writing circuit 3 outputs a signal (d) to a memory 7 in each prescribed distance based on the data (b). The signal (d) is outputted every 0.1s and drive data (e) are successively stored in the memory 7 in synchronism with the signal (d). At the time of traveling at 10km/h, the signal (d) 8 is generated every 1s and the data (e) are successively stored. When an abnormal signal (c) is inputted to the circuit 3, a signal (f) is sent from a timer 5 to the memory 7 as a writing signal. The signal (f) is a pulse generated every 0.05s e.g. and the data (c) are stored in synchronism with the timing signal generated every 0.05s, so that the number of data can be increased and drive data can be surely stored.

Description

[Detailed Description of the Invention] [Objective of the Invention 1 (Industrial Application Field) The present invention relates to a data storage system, and particularly to a data storage device that can be used for data storage, particularly when the vehicle is running at a low speed to a high speed. The present invention relates to a data storage device that efficiently stores data related to vehicle travel in response to all travel speeds.

(Prior Art) In recent years, a data storage device for recording data related to the running of a vehicle is installed in the vehicle, and by analyzing the data stored in this data storage equipment, it is possible to analyze the unsteady operation of the vehicle. When something like this occurs, we try to investigate the cause of J3 failure.

Such conventional data storage devices include already published publications, such as Automotive Technology, VOI-/10, N0
It is published on page 1337 of I0.

FIG. 4 shows such a conventional data storage device, which stores various data related to vehicle travel based on the control of an 8-bit microcombicoater 100.

An outline of this conventional data storage device will be explained below. The microcomputer 100 is connected to each of a plurality of interface circuits 103, 105, 107 and a plurality of timer modules 108, 109 via a system bus 101, and various Process information.

The interface circuit 103 sends switching information input from the key switch 111 to the system bus 101. The interface circuit 105 receives status signals @11
3 to the system bus 101. Further, the timer module 108 sends measurement information from the fuel gauge 117 to the system bus 101. The timer module 109 also sends speed information from the vehicle speed sensor 119 to the system bus 101.

Next, in the RAM (Random Access Memory) 121 which is a work area, the above-mentioned various kinds of information transferred via the system bus 101 are processed based on the till-in command of the microcomputer 100.

Next, in the RAM 123 which is a data area, various data processed in the RAM 121 which is a work area are sequentially stored every time the shuttle passes over a certain period of time based on instructions from the microcomputer 100. Also, microcomputer 10
Based on various data stored in the RAM 123, the controller 0 diagnoses the cause of the unsteady operation of the vehicle, for example.

This diagnostic result is sent to the display device 127 via the interface circuit 103 and display driver 125.
The diagnostic results are displayed.

Further, various data stored in each predetermined cycle are outputted to a data output device (not shown) every time the vehicle travels a certain distance, for example, 101V.

By the way, in order to reliably protect the data stored in the RAM 123 even in the event of an unsteady operation of the vehicle or an accident, the RAM 12
3 with a secondary battery, or use an erasable programmable read-only memory (EPROM) as a storage means to store data, or
It is constructed using electrically erasable programmable read only memory (EEPROM) J to ensure that the data stored in these storage means is protected.

Another conventional example is known as shown in Japanese Patent Publication No. 55-28324. In this conventional example, the storage section for storing data is divided into two parts, one of which is configured to be replaceable, and the storage section used is locked so that it cannot be replaced. At least one parameter out of a plurality of individual meters required for running is stored in synchronization.

Also, as a so-called flight data recorder used in aircraft etc., the one shown in FIG. 5 is known (Publication Patent Publication No. 501176 of 1986).

The conventional example shown in FIG. 5 is composed of a signal acquisition unit 201 and a memory unit 301 that can store data in the event of a collision.

Signal acquisition 1: L unit 01 has data acquisition system 2
03, an interface unit 211, and a central processing unit 219. Data acquisition (η system 20
3 inputs data from the analog data source 205 and the individual data source 207, and sends the various input data to the central processing unit 219. Also, digital data source 2
13 data are provided to a central processing unit 219 via an interface unit 211. Various data processed by the central processing units 1 to 219 are sent to the memory unit 301 where they can be stored in the event of a collision.

A memory unit 301 that can be saved in the event of a collision processes various data sent out by the signal acquisition unit 201 .

A memory controller 305, a memory unit 307, an address decoder 309, and an erase/lQ memory unit 311 are each built into the environment enclosure 306, and these devices are not affected by the external environment. It's like being surrounded.

The scale data processed by the central processing unit 219 is provided to the memory controller 305 via the receiver 303. Memory controller 305 is memory unit 3
07. Various data are stored in the memory unit 307 by operating the address decoder 309 and the erase/circle memory unit 311. That is, the memory unit 307 sequentially stores various data at addresses decoded by the address decoder 309 in synchronization with timing signals from the erase/write memory unit 311 at predetermined intervals.

In the conventional example shown in Fig. 5, data for a certain period of time, for example, 10 minutes, is stored sequentially in a steady state, and in an unsteady state, the data recording operation is stopped after this certain period of time ``A'' has elapsed. Data after the occurrence of an unsteady state is reliably stored. Therefore, based on this stored data, it can be used to analyze failures, accidents, etc., and reduce m1 during repair or identify the cause of the accident. This contributes to speeding up the analysis of

(16 Problems to be Solved by the Invention) However, since the conventional data storage Sln stores scaled data at predetermined intervals,
It was necessary to set the storage section M of the storage section for storing data to be large.

For example, if a word formed by 8 pit data is 5
If we take one word as one unit and store each unit of data every 0.1 seconds for 10 minutes 1N, we get
A memory capacity of about 234 kilobits was required, which caused the problem of increased cost.

Furthermore, in the method of storing various data at predetermined intervals, there is a problem in that the amount of data obtained per unit distance varies depending on the traveling speed of the vehicle.

For example, when driving at low speeds, the amount of data m obtained per unit traveling distance increases, while when driving at high speeds,
1 per 1st place distance! This reduces the amount of data that is stored.

For this reason, when the 1111 J3 cars were running at high speed and an unsteady operation occurred, the data stored during such an unsteady operation became less volatile.

The present invention has been made in view of the above, and an object of the present invention is to provide a data storage device that can appropriately store data related to the running of a vehicle in any running state from low-speed running to high-speed running. do.

[Structure 1 of the Invention (Means for Solving Problem J) In order to achieve the above object, the present invention provides a timing signal output means for outputting a timing signal at a predetermined distance of 1!1m for running as shown in FIG. 2, and a storage means 4 for storing data related to traveling in synchronization with the timing signal.

(Function) 'The present invention is provided with a timing signal output means 2 for outputting a timing signal at a predetermined stroke f1 distance 1σ,
Data related to running is stored in the storage means 1 in synchronization with the timing signal Y) outputted from the timing signal output means 2. Therefore, the data of the gods is stored sequentially every predetermined distance traveled.

(Embodiment) Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

First, the configuration will be explained with reference to FIG.

The terminal P1 is connected to a vehicle speed sensor (not shown) and also to the counter 1. A vehicle speed pulse a corresponding to the traveling speed of the vehicle from the vehicle speed sensor is applied to the counter 1 via the terminal P1. The counter 1 is connected to a data writing circuit 3, and counts vehicle speed pulses a to obtain travel distance data b formed from a pulse signal outputted every time a vehicle travels at a predetermined distance, for example, 2°8V. Data write circuit 3
Output to.

The data writing circuit 3 is connected to an abnormality C viewing device (not shown) through the terminals 1]3, and an abnormality signal C such as an abnormality signal from a sensor or a runaway signal due to a runaway program of a microcomputer is transmitted through the terminal P3. 1 is input to the data write circuit 3, and the data write circuit 3 is connected to the timer 5. This timer 5 is set for a predetermined time, for example, 0.0.
It has a built-in timer circuit for outputting a timer signal "f" every 5 seconds, and sends out the timer signal "f" to the data writing circuit 3 every f times.

The memory circuit 7 is, for example, RAM or IE ROM.
It is made up of etc. In addition, the memory circuit 7 has a plurality of terminals pa
, pb...pn, and are connected to various sensors (not shown) through these terminals, and receive, for example, speed information CI and engine control parameters e.
2. Information related to pedal operation (33, and various drive data C such as parameters en related to transmission control)
is given to the memory circuit 7.

The data gj input circuit 3 is connected to the memory circuit 7.

This data write circuit 3 stores a write signal d formed by a pulse signal outputted to the running pressure fllii'+ every predetermined running distance, for example, every 2.8 m, based on the running distance data b from the counter 1. Output to circuit 7. Further, when the data write circuit 3 receives the abnormal signal C via the terminal P3, it outputs the timer signal ``from the timer 5 to the memory circuit 7 as a write signal d.

The memory circuit 7 sequentially stores various drive data e based on the output timing of the m write signal d from the data write circuit 3. That is, the memory circuit 7 stores drive data C every predetermined distance traveled in a normal running state, and stores drive data 0 every predetermined time in an unsteady state where an abnormality signal C is generated by 1q.

Also, in a high-speed driving condition, for example, when the vehicle is traveling at -100 per hour, this can be obtained in a period of, for example, 10 minutes! To store your drive data, set the memory capacity of the memory circuit 7 to approximately 188 kilobits.

The various drive data C stored in the memory 7 in this manner can be read out by a readout circuit (not shown) or the like.

Next, the operation will be explained with reference to FIG.

First, a data writing operation in a high-speed running state, for example, a state in which the vehicle is running at 100 km/h, as shown in FIG. 3(A), will be described.

When the counter 1 receives a vehicle speed pulse a from a vehicle speed sensor via a terminal P1, it outputs mileage data b to the data writing circuit 3 based on this medium speed pulse a. The data write circuit 3 outputs a write signal @d to the memory circuit 7, which is pulsed every predetermined distance traveled, for example, every 2.8 m, based on the traveled distance data b. This write signal d is 0.0 when the vehicle is running at -100 per hour.
Output every second. The memory circuit 7 maintains a predetermined running pressure tl.
Various drive data e are sequentially stored in synchronization with the input signal d of the IFJ, that is, a timing signal obtained every 0.1 seconds.

Next, a data writing operation in a low-speed running state, for example, a state in which the vehicle is running at 10 km/h, as shown in FIG. 3(B), will be described.

The data writing circuit 3 reads the running pressure 1 based on the running distance data b! A write signal d consisting of a pulse signal of fff2.8m/ff is output to the memory circuit 7. When the vehicle is running at 10 km/h, the write signal @d is output every second. The memory circuit 7 sequentially stores various drive data e in synchronization with a circular signal @d, that is, a timing signal obtained every second.

Next, a description will be given of the rounding operation of the drive data when an unsteady operation occurs in a low-speed running state as shown in FIG. 3(C).

At time t when the vehicle is running at 10 km/h
1, when the abnormal signal C is input to the data write circuit 3, the data write circuit 3 outputs the timer signal t from the timer 5 to the memory circuit 7 as a write signal d. Timer signal
For example, a pulse signal is output every 0.05 seconds. Therefore, the data write circuit 3 switches the 1 second fQ timing signal to the 0.05 second timing signal at J3 at time jl, and uses this 0.05 second iσ timing signal as the write signal d to the memory circuit. Output to 7. As a result, the memory circuit 7 sequentially stores the drive data e in synchronization with the timing signal every 0.05 seconds.

Therefore, it is clear from FIGS. 3(A) and (B) that within a certain period of time, the number of drive data e stored in the memory circuit 7 is larger in the high-speed running state than in the low-speed running state. Become.

Also, as shown in FIG. 3(C), when an unsteady state occurs in a low-speed running state, the drive data e to the memory circuit 7
Since the storage cycle 11 is made faster, a large amount of drive data in an unsteady state can be reliably stored.

[Effects of the Invention] As explained above, the present invention has the following advantages: Since the data related to the running of the vehicle are stored sequentially for each predetermined distance traveled, the Appropriate drive data can be reliably stored no matter which running state J3 is in.

Furthermore, since the storage capacity of the storage means can be reduced, costs can be further reduced.

[Brief explanation of the drawing]

Fig. 1 is a complaint correspondence diagram, Fig. 2 is a block diagram showing an embodiment according to the present invention, Fig. 3 is an explanatory diagram showing the operation of Fig. 2, and Fig. 4 is a block diagram showing a conventional example. 5 are block diagrams showing other conventional examples. 1...Counter 3...Data writing circuit 5...Timer 7...Memory circuit

Claims (1)

[Scope of Claims] A data storage device comprising: timing signal output means for outputting a timing signal every predetermined distance traveled; and storage means for storing data related to travel in synchronization with the timing signal. .