JPS5911126B2 - Movement recording device for moving 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 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 It must be operated during all hours of driving. However, when actually conducting an investigation, it is necessary to
It is sufficient to record the operating state up to a certain time period or distance period before that. In the case of a vehicle, this specific time period or distance period is usually enough time for the vehicle to recognize the occurrence of an accident and apply the brakes to stop the vehicle from its normal driving condition. In the case of railway vehicles, it is generally considered that the maximum stopping distance of 600 meters is good. In this way, the motion recorder of a moving object continuously records extremely short sections while the moving object is running, and if the moving object has traveled a certain distance for another 25 days, the previous recording can be erased.

Therefore, a movement recorder for a moving object reliably records the movement for a certain period of time or a certain distance, erases it after a certain time or travels a certain distance, and then repeats the action of recording the next movement. Any recording device may be used as long as it has a memory that can perform the recording 30 times. However, even if the input power to the recording device is cut off due to an accident, or even if there is some shock, the contents of this memory will volatize for a while35.
Furthermore, it is necessary that the data stored in the memory can be reliably and easily read during investigation.

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 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 for various types of memory because it has excellent read/write functions, is small in size, and has simple peripheral circuitry, but it requires a power supply to operate, so if the power is cut off, 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 RAM. Recently, however, so-called non-volatile RAM has been developed, which can be freely written to and read from, and retains internal data as needed or when the power is cut off, without the need for batteries. Used in some parts.

This known non-volatile RAM is functionally similar to a normal RAM.
It consists of an M section and a read-only memory PROM section that can be electrically written and erased, and is normally operated as a RAM.The principle is that when the power is cut off, the data held in the RAM is written to the PROM. This prevents data from volatilizing, 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. If this non-volatile RAM is used, for example, in a motion recorder for a moving object that needs to repeat motion records every certain distance, it will require no maintenance, 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.

A common use of non-volatile RAM is to move data from RAM to PROM for recording when power is removed. However, in the above-mentioned application as an operation recorder, in addition to the time when the power is cut off, for example, when the emergency brake is activated and the vehicle is stopped, there may be cases where a record of the operation before that time is desired.

In this case, regardless of whether or not the power is subsequently cut off, it is important to keep a record of the emergency braking. The present invention has been made in view of the above-mentioned needs, and is a mobile object capable of operating under conditions other than power-off as described above, giving priority to that condition over power-off. The present invention provides an operation recording device. 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. A write circuit 3 is composed of a write condition logic circuit 8 and a write command generation circuit 9.

Specific circuit examples of the write condition logic circuit 8 and write command generation circuit 9 are shown in FIGS. 2 and 3, respectively. 2
4 is a timing pulse generating circuit for operating the write circuit 3 and the nonvolatile RAM 5, and 4 is an operating state detection device for obtaining operating data of the moving body.

Now, in FIG. 1, the address of the non-volatile RAM is distance sending, so the pulse Fp from the position pulse generator 1, which includes the speed generator and its waveform shaping circuit, is counted by the distance counter 6, and the distance value is is a BCD code and becomes the address of the nonvolatile RAM 5. As the distance increases, the addresses are sequentially changed and various signals, operating conditions, speeds, etc. related to the moving body are stored in the RAM section of the nonvolatile RAM 5 from the operating state detecting device 4. Non-volatile RA
In the normal usage of M, when the power is turned off, the data stored in the RAM section as described above is stored in M as shown in FIG.
By controlling the G signal, the memory contents are transferred to the PROM. For the MG signal, for example, a -28V pulse is R.
It becomes the write signal from AM to PROM, and +28V becomes P.
This is a signal to erase the contents of the ROM. In addition, in addition, R
There is a /W signal, and the ±5V signal is used to write to and read from the RAM, respectively.

Although not shown, some devices are equipped with an NR signal, which is used to transfer the contents of the PROM to the RAM. However, since this operation is normally performed automatically when the power is turned on, it is used when particularly required. Now, as an MG signal, detect the attenuation of the power supply voltage,
First, after erasing the PROM contents with a +28 pulse, -
It is controlled to apply a 28V pulse to transfer the contents of RAM to PROM.

The write command generation circuit 9 has a circuit configuration shown in FIG. 3, for example.

In Fig. 3, the transistor Trl becomes a zener diode ZDl when the +5 and -15V power supply voltages are attenuated.
When the zener voltage drops below one voltage, it turns 0FF and sets the input of the inverter element 1C1 to 0°.Thereby, the ICl
The output of ``1'' becomes ``1''.Since the capacitor C1 is charged at that time, the NAND gate IC2 becomes ``O'', and N
Through the OR gate IC3, a command is issued to the write pulse generation circuit and the erase pulse generation circuit to output the MG signal.
With such an operation, only a write command can be obtained when the power is turned off, so photocouplers PC1 and PC2 are provided and these are controlled using a write condition logic circuit shown in FIG.

In Fig. 2, when the emergency brake is activated as input Y, if a signal of ``11'' is input, the flip-flop I
ClO memorizes and outputs 611 to output Q.

If the vehicle stops under these conditions, a signal of ``11'' will be input from the input
The conditions under which the car suddenly stopped at l2 are memorized and input Z
Outputs "0" to output B in synchronization with the clock signal from input Z. Output B returns to 61 degrees with the next clock signal from input Z. Flip-flop ICl4 performs a memory operation when output B becomes "01". .At this time, ClO and ICl2 are set, but ICl4 indicates that the system has been stopped due to an emergency.
is stored in memory, and the output A is held at 0. Due to this "stoppage due to an emergency", input B in Fig. 3 becomes "0", and photocoupler PC2 operates to generate a write pulse in the MG signal, but after that, input A becomes "60". Therefore, one end of the input of IC2 is pulled to "0" by the photocoupler PCl, thereby masking the generation of the MG signal even if the power is cut off afterwards.

If the emergency brake is applied again to stop the vehicle, the input B becomes 'O', so the MG signal can be generated again.The above operation is shown in a timing chart as shown in Fig. 4.The timing chart in Fig. 4 When the power is cut off at 4, an MG signal is generated, but after the MG signal for stopping due to the first emergency is generated, no MG signal is generated at 0, and when the emergency stop occurs again, an MG signal is generated again. 5th The figure is a timing chart showing the operation of the write condition logic circuit.The above describes an example in which data is stored in PROM when the emergency brake is applied to stop the program.
When writing to OM, various applications are possible by simply modifying the logic circuit.

As explained above, according to the present invention, the nonvolatile RAM
By providing a writing circuit that commands writing from RAM to PROM according to specified conditions in a moving body motion recording device using It is possible to obtain a motion recording device for a moving body that can record required motion information as a nonvolatile memory.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing the basic configuration of the present invention, and FIGS. 2 and 3 are respectively the write condition logic circuit 8 in FIG. 1.
4 and 5 are timing charts showing the operation of each part in the present invention, respectively. DESCRIPTION OF SYMBOLS 1...Position pulse generator, 2...Timing pulse generation circuit, 3...Write circuit, 4
......Operating state detection device, 5...Non-volatile generation RAM16...Distance counter, 8...
-Write condition logic circuit, 9...Write command generation circuit.

Claims (1)

[Claims] 1. In a motion recording device for a moving body using a non-volatile RAM consisting of a RAM section and a PROM section, data is stored in the RAM section in response to a power outage and a predetermined condition determined separately from the power outage. The present invention further includes a write circuit that provides a write command for transferring the operation information of the moving object to the PROM section, and masks a write command caused by a power cut when the write command is given according to the predetermined conditions. Features: A motion recording device for moving objects. 2. The motion recording device for a moving body according to claim 1, wherein the writing command is given on the condition that the moving body has stopped due to an emergency stop.