JPS6013240B2 - Mobility memory device for mobile objects - Google Patents

Description

[Detailed Description of the Invention] When an accident occurs, moving objects such as vehicles and aircraft are equipped with recording speedometers, various equipment operation recorders, etc. to assist in investigating the circumstances of the accident. There may be cases.

These are performed by recording on recording paper or endless magnetic tape, which must be updated, but in the former case, the recording paper must be updated, and in the latter case, the magnetic tape must be replaced due to wear and tear over time, and the magnetic head This requires considerable effort such as cleaning. However, ``These recording devices for accident investigation are sufficient to record the operational status of a moving object for a short period of time in the vicinity of an accident, but in reality, it is not known when an accident will occur, so However, when actually conducting an investigation, it is necessary to record the operating status from the time of the accident to a specific time period or distance before the accident occurred. In the case of a vehicle, this specific time period or distance period is usually sufficient for a vehicle to recognize the occurrence of an accident and apply the brakes to stop the vehicle from its normal driving condition. For example, in the case of a general railway vehicle, it is said that the maximum braking distance of 60 mh is sufficient.In this way, the movement memory of a moving object continuously covers extremely short sections while the moving object is running. If a moving body memorizes the motion for a certain period of time or a certain distance, and then travels a certain distance again, the previous memory will be erased. Any storage device may be used as long as it has a memory that can be erased after a specific time or a specific distance has been traveled, and then repeatedly store the next action.However, this memory cannot be erased due to the occurrence of an accident. Even if the input power is cut off or there is some shock, the contents of the memory must not be volatile for a while, and the memo must be able to read the stored data reliably and easily when investigating. It needs to be possible.

Although recording paper and magnetic tape can be said to be excellent in this respect, they have problems in terms of durability, maintenance, and structural complexity. In some cases, known magnetic cores are used to digitally record the speed of moving objects and the operating status of devices, but they are expensive, have complicated peripheral circuits for reading and writing, and There are problems such as there are limits to miniaturization. Known random access using metal oxide G semiconductor (MOS) or TTL semiconductor integrated circuits that can digitally write and read various data at any time.

Memory (RAM) has excellent read/write functions, is small in size, and has simple peripheral circuits, so it is widely used in various types of memory. However, RAM requires a power source to operate, and there is no possibility that the power will be cut off. If this happens, all internal data will be completely volatile. Therefore, as a measure against power outage, a method is sometimes used in which a small mercury battery is added only to the power source of the RNM. However, recently, it has become possible to write and read data freely, and it continues to retain internal data as needed or when the power is cut off, without the need for batteries.
So-called non-volatile RAM has been developed and is used in some areas. Functionally, this known nonvolatile RAM consists of a normal RAM section and a program-only memory (PROM) section that can be electrically written and erased.
When the power is cut off, the RAM
The principle of writing the data held in the PROM into the PROM prevents data volatilization, and when the power is restored, the data in the PROM is read out to the RAM and used.

Data can be read out to the RAM many times unless an erasure command is given to the PROM. This non-volatile RAM can be used, for example, in a motion memory device for a moving object that needs to repeat motion memory every fixed distance.
There is no need for maintenance, the external circuit is extremely simple compared to core memory, and it is possible to create a compact and highly reliable device.

The feature of this device is that this non-volatile RAM can normally be erased sequentially, and if it becomes necessary to memorize the operating state due to an accident, it can be stored reliably even in the event of a power outage. Store that data and save it whenever you need it.
The purpose is to read out and use the data so that it can be analyzed.

From a functional perspective, the nonvolatile RAM explained above is
Although we have described an example consisting of an M section and a PROM section, MNO
Some non-volatile RAMs manufactured by S (Metal Nitrite Oxide Semiconductor) operate as RAM and cannot be separated into two functions, such as a RAM part and a PROM part (or have PROM elements added to them). do not)
In addition, a type of RAM that does not condense information even if the power supply is cut off is already known, and this type of RAM will also be collectively referred to herein as nonvolatile RAM. When non-volatile RAM is used as an operation memory for the above-mentioned purpose, its memory capacity is limited.
When the data written to the memory becomes full, no more data can be stored. Therefore, every time it is necessary to write new data, it is necessary to sequentially erase old data according to the address and replace it with new data before storing it.
Data stored in this way is transferred to PROM and stored when storage is necessary, but when this data is later submitted for analysis, the boundary between new data and old data may not be clear. Otherwise, it would not be possible to organize them in chronological order or distance order. This invention has an extremely simple configuration.
The object of the present invention is to provide a motion storage device for a mobile object that can clearly distinguish between old and new data. The present invention will be explained below with reference to the drawings.

FIG. 1 is a system diagram showing the basic configuration of the present invention. 1st
In the figure, 5 is a non-volatile RAM which is sequentially and periodically addressed by the output signal of a distance counter 6 which counts the output p of a pulse counter 1 which generates a number of pulses proportional to the moving distance of the moving object. 3 is a write circuit, which is composed of a write condition logic circuit 8 and a write command generation circuit 9, and when the power is cut off or an emergency stop signal is applied to inputs X and Y,
Memory data in the RAM section of non-volatile RAM 5 is transferred to PROM.
A command signal MG is generated to be transmitted to the section.

2 is a timing pulse generation circuit for operating the write circuit 3 and non-volatile RAM 5; 4 is an operating state detection device for obtaining operating data of the moving object; 7 is a timing pulse generating circuit for operating the writing circuit 3 and the non-volatile RAM 5; 7 is a timing pulse generating circuit for operating the moving object; and 7, when the moving object travels a certain distance, the distance counter 6 overflows. Output CD that changes alternately from “1” to “0” and “0” to “1” each time
The "1" and "0" output CD thereof is input to the RAM section of the nonvolatile RAM 5 in parallel with the data from the operating state detection device 4.

By using the above configuration, the output of the operating state detection device 4 and the output CD of the frequency divider 7 are written into the nonvolatile RAM.

The distance pulse p is input to the distance counter 6, which takes out the count value as a binary output of Lo to L2 and uses it as an address designation of the nonvolatile RAM. Further, the overflow output CA of this counter is input to the frequency divider 7,
Every time this pulse reaches one, the output CD of the frequency divider 7 becomes “0”.
” → “1”, “1” → “0”. Therefore, from the time you start inputting pulses to the distance counter 6 until the first overflow occurs, “CD is “0”, and then the next overflow It remains "1" until the output of the distance counter 6 occurs.Therefore, by writing this CD output signal together with the operation data to each memory address corresponding to the output of the distance counter 6, it becomes possible to distinguish between old and new data. A timing chart of these operations is shown in Fig. 2. Fig. 2 shows the case where the memory capacity of the nonvolatile RAM is 8 addresses, where NAP is the position pulse, and L to L2 are the binary count outputs of NAP. , which indicates addresses that are sequentially and cyclically addressed in the RAM section.

CA is an overflow output signal of the distance counter 6, which is generated once every time the moving object moves a distance corresponding to 8 pulses of the position pulse generator 1.

CD is the output signal of the frequency divider 7 and is one period (a) of the RAM address.
It becomes “0” at addresses 0 to 7 of
”, changes from “1” to “0”. If the memory of the RAM section is transferred to PROM at point B due to a power cut or emergency stop, the operating state detection data will be stored in PROM memory addresses 0 to 7. Data is stored in the order of addresses 4 to 7 and 0 to 3. However, since the actual memory is arranged in the order of addresses O to 7, the correct operating state cannot be determined unless the starting point, address 4, is detected. However, as mentioned above, the CD signal is stored in parallel with the operation data, and this is also PR.
Since the signal is transferred to the OM, the point where the CD signal changes from "0" to "1" or from "1" to "0" can be detected as the starting point.
This allows the operating states to be detected in a temporally correct order. Note that a description of the operation of the write circuit 3 will be omitted since it is not directly related to the gist of the present invention.

As explained above, according to the present invention, in a motion storage device for a mobile body that stores non-volatile RAM operating state detection data while sequentially rewriting them according to the addresses, the non-volatile RAM addresses are To “
By rewriting and storing bit signals that alternately change to 0 and 1 together with the above data, RA
The boundaries between old and new storage in M can be detected, thereby providing a simple and rational mobile operational storage system that uses addressed storage to read data in the correct temporal order.

Further, in the above description, a position pulse and a distance counter are used, but it is also possible to use a time pulse and a pulse counter to store the operating state at fixed time intervals.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing the basic configuration of the present invention, and FIG. 2 is a timing chart showing operation signals of each part in the present invention. 1...Position pulse generator, 2...Timing pulse generation circuit, 3...Write circuit, 4...
...Operating state detection device, 5...Nonvolatile R
AM, 6... Distance counter, 7... Frequency divider. Figure 1 Figure 2

Claims (1)

[Claims] 1. A motion storage device for a movable body that sequentially and periodically addresses a nonvolatile RAM and stores detected motion state data of the movable body while rewriting according to the address, comprising a pulse generator and an input terminal connected to the pulse generator. A counter whose output terminal is connected to a terminal that addresses a memory address in RAM and an overflow terminal of this counter, and each time the overflow signal is received, the output signal changes to "0" and "1" alternately. A frequency divider, and an output terminal of the frequency divider is connected to a terminal for inputting data stored in the RAM, and the output signal of the frequency divider is sequentially stored in the RAM in parallel with the operating state data of the mobile body according to the address. A motion storage device for a mobile object, characterized in that the memory is stored while being rewritten.