JPS592926B2 - Movement record reading device for mobile objects - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operation record reading device for a moving body using a non-volatile RAM.

BACKGROUND ART Mobile objects such as vehicles and aircraft are sometimes equipped with recording speedometers, various equipment operation recorders, etc. to assist in investigating the circumstances of an accident when an accident occurs.

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 Cleaning requires considerable effort. However, these recording devices for accident investigation only need 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 The vehicle must be operated at all times when the vehicle is running. However, when conducting an actual investigation, it is sufficient to record the operating conditions from the time of the accident to a certain time period or distance. This specific time period or distance range is sufficient for a regular vehicle to recognize the occurrence of an accident and apply the brakes to stop the vehicle from its normal operating state; for example, for a general railway. In the case of a vehicle, it is generally said that a maximum brake stopping distance of about 600 m is sufficient. 20
In this way, the movement recorder of a moving object continuously records extremely short sections while the moving object is running, and once the moving object has traveled a certain distance, the previous recording can be erased.

Therefore, a movement recorder for a moving object has the function of reliably recording the movement for a certain period of time or a certain distance25, erasing it after traveling for a certain time or a certain distance, and recording the next subsequent movement. Any recording device may be used as long as it has a memory that can be used repeatedly. However, even if the input power to the device is cut off or some shock occurs, the contents of this memory must not be volatile for a while, and the memory It is necessary to be able to reliably and easily read the data stored in the computer when examining it.

In this respect, recording paper and 35 magnetic tape can be said to be excellent, but 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 these methods are expensive, require complicated peripheral circuits for reading and writing, and There are problems such as there are limits to miniaturization. Random access memory (RAM) is a well-known random access memory (RAM) using metal oxide semiconductor (MOS) or TTL semiconductor integrated circuits that can digitally write and read various data at any time.
) is widely used in various types of memory because it has excellent read/write capabilities, is small in size, and has simple peripheral circuitry, but RAM requires a power source to operate, and the power supply may be cut off. In this case, the internal data will be completely volatile.

Therefore, as a countermeasure against power outage, a method of adding a small mercury battery only to the power source of the RAM is sometimes used. However, recently, it has become possible to write and read data freely, and it continues to retain its 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 in use in some areas. Functionally, this known non-volatile RAM consists of a normal RAM section and a read-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 to the PROM prevents data from volatilizing, and when the power is restored, the data in the PROM is read out to the RAM and used.

Reading to the RAM can be performed many times unless a special erase command is issued to the RPOM. If this non-volatile RAM is used, for example, in a motion recorder for a moving object that needs to repeat motion records every fixed distance, maintenance will be unnecessary, the external circuitry will be extremely simple compared to core memory, and it will be compact. This makes it possible to realize highly reliable equipment.

The feature of this device is that this non-volatile RAM can normally be erased one after another, and if it becomes necessary to record its operating status due to an accident, it can be reliably stored even in the event of a power outage. The data is stored in the
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 in which information does not volatilize 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 a non-volatile RAM is used as an operation recorder for the purpose described above, its memory capacity is limited, so once the RAM is full of data, 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. Data stored in this way is transferred to PROM and recorded when it is necessary to record it, but when you try to read and analyze this data later, you need to know the boundary between new data and old data. For example, they cannot be organized in order of time or distance. It is an object of the present invention to provide an operation record reading device for a moving body which has an extremely simple structure and can clearly distinguish between old and new data, thereby making it possible to easily write and read 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 Fp 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 body; 1 is a timing pulse generating circuit for operating the writing circuit 3 and the non-volatile RAM 5; 1 is a timing pulse generating circuit for operating the moving body; and 1, when the moving body travels a certain distance, the distance counter 6 overflows. This is a frequency divider that generates an output CD that alternately changes from "1" to "0" and from Z to T each time the output is changed.
The data is input to the RAM section of M5 in parallel with the data from the operating state detection device 4.

10 is a reader consisting of a display device, a business graph, etc.;
Reference numeral 11 denotes a read pulse generator for incrementing a distance counter 6 that specifies the order of read data.

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 in the nonvolatile RAM and read out when necessary.

The distance pulse Fp is input to the distance counter 6, which takes out the count value as a binary output of LO-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 comes, the output CD of the frequency divider 7 is 50
1→T, T→101. Therefore distance counter 6
From the moment a pulse is started to be input until the first overflow occurs, CD remains at L, and from then on until the next overflow occurs, CD remains at T. Therefore this C
By writing the D output signal together with the operation data at each address in the memory 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. Figure 2 shows a case where the memory capacity of non-volatile RAM is 8 addresses, Fp is a position pulse, LO-L2 is a binary count output of Fp, and shows the addresses that are sequentially and cyclically addressed in the RAM section. ing.

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 Af of the RAM address)
ν at addresses O to 7, and T at addresses O to 7 in the next cycle Bf), and changes from ν to T, T−+0'' every cycle of the RAM address.

Assuming that the memory in the RAM section is transferred to the PROM at point B due to a power cut or emergency stop, the operating state detection data will be stored at addresses 0 to 7 of the PROM memory, 4 to 7, 0 to 3.
They are stored in address order.

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 operating data, and this is also transferred to the PROM, so the point where the CD signal changes from 1) 01F->T or T-+10° 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. Generally speaking, the reading procedure is (1) Transfer the written data from PROM to RAM.

(2) Specify an address and output data from the RAM.

(3) At this time, do you control whether the data is read (READ) or written (WRITE)? Switch the mourning signal to readout.

(4) At the same time, a route is set using, for example, a tri-state gate to switch the output (information to be read) of the nonvolatile RAM so that it does not differ from the input as operating state information.

(5) Since the data to be output comes out according to the address, this is displayed or printed.

The order is as follows.

By the way, there is no problem with the above (1) because the PROM is set to the RAM when power is applied to the nonvolatile RAM.

In addition, (2) and (4) can be realized using well-known techniques, although it is a question of how to control them from the outside. Above (2
) is the usual method using non-volatile RAM.
This is a method of extracting data by giving a binary code address to the address terminal of the device.

However, in the case of this method, some kind of binary code generator is required on the reader side, and when providing that input, the output of the address designator (in this case, the distance counter) of the recorder and the output of the reader There is a problem in that a gate must be provided on the motion recorder side so that the input can be switched.

In the present invention, in consideration of the above problems, the distance counter of the movement recorder is used as a binary code generator for the read address.

That is, in FIG. 3, the area inside the two-dot chain line is the operation recorder, and the area outside is the reader.The operation status information is applied here through the contact 12, and is applied to the tristate gate 14 through the buffer gate 13.

The tristate gate 14 is provided for the purpose of preventing shortcuts with operating state information during reading. The distance pulse from the speed generator TG is input to the distance counter 6, and since this counter is a binary counter, its contents (distance value) are output in binary.

This binary value is the address of the nonvolatile RAM. The flip-flop frequency divider 7 following the distance counter is used to separate old and new data as described above. Now, if the distance pulse 0R of the speed generator is input from the repeater using the self-resetting push button 15, the number of times the push button is pressed becomes a binary address in the non-volatile memory, and the address in the memory is advanced one by one. Next, the reader 10 should be equipped with one that displays and prints the output of the nonvolatile memory, but the above-mentioned tri-state gate is provided at the output of this output to separate it from the operating status information. removed.

During this reading, the switch 17 is set to the reading side.

The read information is received by buffer gate group 18,
The light emitting diode group 19 is turned on.

In the reader configured in this manner, each time the push button 15 is pressed, the information in the nonvolatile memory at the corresponding address can be displayed on the light emitting diode group 19. There is no need for an address setter including a binary code generator or the like for address specification.

Furthermore, if reading is to be performed automatically, the oscillator 20 and frequency divider 21 generate a pulse of an appropriate time as shown in FIG. 4, and this is applied to the A terminal in FIG. It is possible to send the data, and in order to record the output, data for each address can be recorded by applying the same pulse to the A terminal on the sending side of the Visigraph, which can control the sending.

In this way, we do not have to prepare a special address setting device for the non-volatile memory reader, and instead use the distance counter used in the recorder (or the time counter when the movement recorder records time) as a binary address setting device. Reading becomes possible.

As explained above, according to the present invention, an operation recording device for a mobile body stores operation state detection data in a nonvolatile RAM while sequentially rewriting it according to an address by a counter.
By storing in parallel with the above data a bit signal that alternately changes to "0" and "1" at each round of addresses in the nonvolatile RAM, together with the above data,
A simple and rational mobile device that can detect the boundaries between old and new memories in RAM and read out the stored information using the same counter as for addresses in the memory, thereby reading data in the correct temporal order. It is possible to obtain an operation record reading device.

Furthermore, although the above description uses a position pulse and a distance counter, it is also possible to record and read out the operating state at regular time intervals using a time pulse and a time counter.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing the basic configuration of the present invention, FIG. 2 is a timing chart showing operation signals of each part in the present invention,
FIG. 3 is a circuit diagram showing one embodiment of the reading section in FIG. 1, and FIG. 4 is a circuit diagram showing another embodiment. DESCRIPTION OF SYMBOLS 1...Position pulse generator, 2...Timing pulse generation circuit, 3...Write circuit, 4...Operation state detection device, 5...Nonvolatile RAM, 6...Distance counter, 7... Frequency divider, 10... Reader, 11... Read pulse generator, 14... Tri-state gate, 15
... Readout push button switch, 17... Readout changeover switch, 19... Light emitting diode, 20... Oscillator,
21... Frequency divider.

Claims (1)

[Claims] 1 Equipped with a counter that addresses a memory address in a non-volatile RAM, and a frequency divider whose output signal alternately changes to "0" and "1" each time this counter overflows, and the output of this frequency divider R signal in parallel with the motion signal of the moving object
A mobile object that stores an operating signal in RAM and "0" and "1" signals of the frequency divider sequentially in accordance with the count of the counter, and stores them in an AM while being rewritten sequentially according to the address. Operation record reading device.