JPS5912968B2 - Vehicle information recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle information recording device that records various vehicle information on a magnetic tape.

As a conventional vehicle information recording device, the
As described in Japanese Patent No. 556 and Japanese Patent Publication No. 45-25036, a magnetic disk is rotated in proportion to the vehicle speed,
A pulse signal of a constant frequency is applied to this magnetic disk via a magnetic head, and the vehicle speed, which is one of the vehicle information, is recorded on the magnetic disk at the intervals of the pulse signals.

However, with the above-mentioned conventional device, not only can the vehicle speed be recorded only for a short period of time, which is only one revolution of the magnetic disk, but also
Since the recording time varies depending on the vehicle speed, there is a drawback that it is difficult to record the driving state of the vehicle for a long period of time, such as one day or more. It is also possible to use a magnetic tape instead of a magnetic disk and record vehicle information on this magnetic tape, but the recording time of a general magnetic tape is -51 hours, and the maximum recording time is about 2 hours. Therefore, in order to record the driving conditions of a vehicle over a long period of time, such as one day or more, a specially complicated speed reduction device is used to reduce the speed of the magnetic tape to 1/24 to 1/12 of the normal speed. There is a drawback that it must be done. In order to solve the above-mentioned drawbacks, the present invention stores the information to be input into the vehicle in a temporary storage IC memory device, and records the stored information in the IC memory device in a magnetic tape recording device, so that complex deceleration is not possible. Vehicle information can be collected over a long period of one day or more without using any equipment and with a relatively small device.
It is possible to magnetically record each piece of information stored in the IC memory device, and even if the power supply is cut off, such as when the ignition switch is opened or the power line of the in-vehicle power source is cut off, the IC memory device By continuing to supply power to the 10th position to maintain memory content, even if the power supply is cut off due to an unexpected accident or opening of a power switch such as the ignition switch, information will be automatically saved in the IC memory device and valuable information will be preserved. It is an object of the present invention to provide a vehicle information 35 recording device that can prevent information from disappearing. Furthermore, the present invention provides power to the magnetic tape recording device from the backup storage battery even after the power supply is cut off, and causes the magnetic tape recording device to store the information stored in the 1C memory device when the power supply is cut off. The object of the present invention is to provide an information recording device for a vehicle that allows a magnetic tape recording device to more reliably record information stored in an IC memory device immediately before power supply is cut off. be. The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 is a program diagram showing an outline of the configuration when the device of the present invention is applied to a taxi. 1st
In the figure, reference numeral 1 denotes an information input device, which includes a magnetic card reader 1B, a keyboard input device 1C, a mileage detection circuit 1D including a counter circuit, and a time signal input device 1E. Reference numeral 2 denotes an IC memory device, which consists of four shift registers 2A, 2B, 2C, and 2D.

Then, the magnetic card reading device 1B reads the information written on the magnetic card 1A such as a credit card, converts only necessary unique information into a binary code of several bits, and then controls this unique information. A clock pulse from the circuit 10 causes the clock pulse to be serially output from the output terminal 1b and is input to the input terminal 2d of the shift register 2A, and a shift pulse is applied from the control circuit 10 to the shift register 2A in accordance with this input information. And this magnetic card reader 1
The unique information encoded by B is stored in the shift register 2A having a capacity of several tens of bits until a timing signal for writing is received from the control circuit 10. Further, the keyboard input device 1c inputs desired information (
For example, you can enter the taxi fare. The input desired information is similarly converted into a binary code and then outputted from the output terminal 1d, inputted to the shift register 2B from the input terminal 2e of the shift register 2B, and shifted according to this input information. A shift pulse is applied from the control circuit 10 to the register 2B, and the desired information is stored in the shift register 2B, which has a capacity of several hundred bits, until the write timing comes. The keyboard input device 1c has an information input start switch, a storage start switch, and a storage stop switch, and by operating the information input start switch, an information input start signal is generated at its output terminal 1m, and recording starts. By operating the switch, a recording start signal is generated at the output terminal 1k, and by operating the recording stop switch, the power switch 1C1 is opened. The input terminal 1e of the mileage detection circuit 1D is connected to a speed sensor S, which is generally known and includes a permanent magnet that rotates in accordance with the rotation of the wheel, and a reed switch that opens and closes depending on the rotation of the permanent magnet. One pulse signal is input. For example, at a running speed of 60 [Kya/h], 63
If the speed sensor S is set to rotate 7 times and generates distance signal pulses at a rate of 4 times per revolution, the interval between the pulses corresponds to 0.375 Cn11 in travel distance. Therefore, from the time when the information input start signal from the output terminal 1m of the keyboard input device 1C is applied, the mileage is calculated by dividing the pulse from the speed sensor S by the counter circuit of the mileage detection circuit 1D. Can be detected. For example, by frequency-dividing the output pulse of the speed sensor S to V266, the output terminal 1f of the traveling distance detection circuit 1D has approximately 1001 m.
A mileage signal of one pulse is generated for each pulse. and,
This detected mileage signal is applied from the output terminal 1f to the input terminal of the shift register 2c for temporary storage, and is recorded on the magnetic tape while shifting its contents to the right every pulse in synchronization with the input pulse. It is temporarily stored in this shift register 2C until timing occurs. Note that if the shift register 2C requires storage for two hours, a capacity of 2000 bits is sufficient. The time signal input device 1E mainly consists of a clock circuit that generates a reference time signal, and generates a time signal in units of, for example, 10 seconds from the time when the information input start signal from the output terminal 1m of the keyboard input device 1c is applied. and its output terminal 1g
By applying the output to the shift register 2D, the integration result is temporarily stored in the shift register 2D in synchronization with the input pulse. The capacity of this shift register 2D is 7, assuming that it can store 2 hours.
About 20 bits are used. 3 is an encoding circuit, and when a magnetic tape write trigger signal is applied from the control circuit 10 to each register 2A to 2D1 of the IC memory device 2, the magnetic tape recording device 4, and the encoding circuit 3 at an appropriate timing. , each register 2A to 2D
After adding phase modulation, which is the code form to be recorded on the magnetic tape, to the natural binary code information serially output from the 3
It is serially output from each encoding circuit output terminal of h to 3m. 4 is a magnetic tape recording device, and 4A is a four-channel write head for a generally known force-set magnetic tape, which is connected to the encoding circuit 3, and the phase-modulated data signal is sent to the write head 4A. 04B added to each channel and recorded on the magnetic tape is a generally known cassette magnetic tape containing a magnetic tape.

Reference numeral 4C denotes a magnetic tape drive device, which is mainly composed of a generally known direct current motor, and is adapted to drive a force-set magnetic tape winding shaft via a suitable speed reduction device.

4a and 4b are input terminals of the magnetic tape drive device, and a voltage is supplied to either of these terminals 4a or 4b through a power supply selection circuit 9, and a write control signal is applied from an output terminal 10h of a control circuit 10. Only then will the motor begin to rotate, and the motor will drive the take-up shaft, causing the magnetic tape to run in contact with the head surface.

5 is a generally known in-vehicle storage battery as an in-vehicle power source,
Reference numeral 06 which supplies a DC voltage of 12CV1 is a reserve storage battery, which is charged from the on-vehicle storage battery 5 via the supply power selection circuit 9 during normal driving.

Then, only when the power failure detection circuit 8 detects a disconnection of the ignition switch or a disconnection of the wiring from the on-board storage battery 5, the backup storage battery 6 functions to supply voltage to each part of the device for holding or driving. supply the power supply voltage. Reference numeral 7 denotes a buffer circuit, which detects the state of the ignition switch based on a signal input to the input terminal 7a from a switch 7d that opens and closes in conjunction with an ignition switch (not shown). When the vehicle is in the closed state, that is, in a state where the vehicle can run, 1 is applied to the output terminal 7b.
21 DC voltage signals are generated.

Further, when the ignition switch is opened, the open/closed state of the ignition switch is detected by generating a signal of 0CV1 at the output terminal 7b. 8 is a power failure detection circuit, and one input terminal 8a is connected to the output signal of the buffer circuit 7.

Further, the other input terminal 8b is directly wired from the vehicle storage battery 5. Therefore, the input terminal 8b is always 12 (
9) DC voltage is applied. FIG. 2 shows a specific configuration of the power-off detection circuit 8. As shown in FIG. In this FIG. 2, TRl and TR2 are the first and second transistors, Rl,
R2, R3, R4, and R are resistors, respectively. Currently, during general driving, both input terminals 8a and 8b have 12 (to).
power supply voltage is applied. At this time, the first transistor TRl becomes conductive, so that the second transistor TR2 is cut off, and the terminal 8c has 12
- A voltage of R' (R4+R5) (7) is generated.

However, when the ignition switch is turned off, the switch 7d is closed in conjunction with the ignition switch, and the potential of the output terminal 7b of the buffer circuit 7 becomes zero (9). The potential of the input terminal 8a also becomes zero, the first transistor TRl is cut off, the second transistor TR2 becomes conductive, and a voltage of approximately zero (9) is output to the output terminal 8c.

Furthermore, when the wiring from the on-vehicle storage battery 5 is disconnected, the power supply voltage is no longer applied to the power-off detection circuit 8, so that its output terminal 8c becomes equal to zero potential.

In other words, the power-off detection circuit 8 shown in FIG. 2 has an input terminal 8a.
, 8b as input and output terminal 8c as output, so if one or both of the two inputs becomes zero at the same time, zero (9) will be output from output terminal 8c. . Also, R5l2x? is applied to the output terminal 8c only in a normal running state. (7) The output of the DC voltage results in R4+R5.

Reference numeral 9 denotes a supply power selection circuit, and FIG. 3 shows an example of a concrete example of the circuit.

In this Fig. 3, 9A is a relay, and input terminal 9
When the voltage at a is zero (9), contacts 9j and 9k are closed, contacts 9g and 9h are kept open, and they are excited only while voltage is applied to input terminal 9a. A current flows through the coil 91, which connects the contacts 9g and 9h and opens the contacts 9j and 9k. C1 is a capacitor with a large capacity, and after the voltage to be supplied from the input terminal 9e is cut off by the relay 9A, the voltage is supplied from the reserve storage battery 6 to the output terminal 9c through the input terminal 9d and relay contacts 9k and 9J. Output terminal 9b only for a very short time before it becomes supplied.
It is inserted with the role of maintaining the voltage. D1 is a diode, and the charge charged in the capacitor C1 is transferred to the output terminal 9f.
This is to prevent it from flowing to the side. 10 is a control circuit, which controls the time signal input device 1 according to the trigger signal from the keyboard input device 1c and the power-off detection circuit 8.
Control signals and timing pulses are sent to various parts of the apparatus by clock pulses from the output terminal 11 of E, 10a is an input terminal to which a recording start signal is applied via a NAND circuit 10A, and 10b and 10c are power supply terminals. 10d is an input terminal to which a voltage is supplied; 10d is an output terminal for applying a clock pulse for encoding to the encoding circuit 3;
e is an output terminal for applying a shift pulse to each of the shift registers 2A to 2D of the IC memory device 2 for continuing or writing in some cases; 10f is a magnetic card reading device 1B of the input device 1; 10g is an input terminal to which a basic clock pulse is applied from the output terminal 11 of the time signal input device 1E.

Next, the operation of the apparatus of the present invention with the above configuration will be explained.

If the ignition switch is closed and the vehicle is ready to run, the input terminal 8a of the power failure detection circuit 8,
A DC voltage of 12 CV) is applied to both transistors 8b, and the second transistor TR is in a cut-off state, and a voltage of approximately 12 CV1 is output to the output terminal 8c. This voltage is applied to the input terminal 9a of the supply power selection circuit 9, and the relay 9A is activated to connect the relay contacts 9g and 9h.
is connected, and the relay contacts 9j and 9k are briefly disconnected, so that power supply voltage is supplied from the on-vehicle storage battery 5 to each part of the device through the output terminal 9b.

Also, before the vehicle starts running, the time signal input device 1E can be activated by turning on the information input start switch using the keyboard input device 1C in the information input device 1 or by inputting a predetermined code. starts counting the time after that and stores time information in the register 2D moment by moment. The distance detection circuit 1D also counts the distance traveled, and after the distance traveled, the keyboard input device 1C
By operating the recording start switch, the information is read from the magnetic card 1A, along with the unique information stored in the temporary storage register, the mileage information and cumulative time information temporarily stored in the registers 2C and 2D. Desired information input from the keyboard input device 1C is recorded on the magnetic tape. The timing of recording on this magnetic tape is shown in the time chart of FIG. Now, by operating the recording start switch of the keyboard input device 1C, the output terminal 1
When the recording start signal shown in FIG.
When the motor drive signal shown in FIG. By driving the winding shaft of the set magnetic tape 4B, the magnetic tape starts running.

After the time t1 in FIG. 4 when the tape speed reaches a predetermined value after the motor rotates, each register 2A, 2B, When the shift pulse shown in FIG. 4C is applied to the shift pulse input terminal through internal wiring not shown in 2C and 2D, each register 2A to 2
D outputs each stored information. For example, if the information stored in the shift register 2A is output as [10110...10] as shown in FIG. 4D, the encoding circuit 3 applies phase modulation. As a result, a recording signal shown in FIG. 4E is generated, applied to the recording channel 4d in the head 4A, and recorded on the magnetic tape. The above description is based on the case where the information input device 1 is operating normally.
When the ignition switch is turned off or the data input from B to 1E is stored in each register 2A to 2D of the IC memory device 2, but not yet recorded on the magnetic tape, or if the This section explains what happens when the power is cut off due to an accident, etc. Voltage signals from the ignition switch and from the vehicle storage battery 5 are applied to input terminals 8a, 8b of the power failure detection device 8, and input terminals 8a, 8b of the power failure detection device 8. The relationship with the output terminal 8c logically forms an AND circuit.

Therefore, when the ignition switch is opened and/or the wiring from the in-vehicle storage battery 5 is disconnected, the output terminal 8c of the power failure detection device 8 becomes zero (9), which is the power failure detection signal. The voltage becomes , and the supply power selection circuit 9
Current does not flow through the excitation coil 91 of the relay 9A inside, and the relay 9A shifts from an activated state to a non-activated state, until now the contacts 9g and 9h were connected, and the contacts 9j and 9k were disconnected and disconnected. , the contacts 9j and 9k are connected, and the contacts 9g and 9h are disconnected. As a result, the voltage that was previously supplied from the on-vehicle storage battery 5 is now supplied from the reserve storage battery 6. In this state, the IC memory device 2, encoding circuit 3,
Only the magnetic tape recording device 4 and the control circuit 10,
No voltage is supplied from the backup storage battery 6 to the information input device 1. However, only the input terminal 1P of the oscillator that generates the reference clock pulse in the time signal input device 1E outputs the reference clock pulse from the output terminal 11 by being supplied with voltage from the reserve storage battery 6. Then, the power-off detection signal shown in FIG. 4 G from the power-off detection circuit 8 is NAN])
It is also applied to the input terminal 10a of the control circuit 10 via the circuit 10A. This detection signal changes from 12(9) to 0(9)
), the control circuit 10 performs the same function as when the trigger signal shown in FIG. After a time t1 shown in FIG. 4 after the tape starts running, the information temporarily stored in each register 2D is recorded on the magnetic tape at a write time T2. Furthermore, even if the power-off detection signal shown in FIG. 4G is applied to the input terminal 10a of the control circuit 10, if the power switch 1C1 of the control circuit 10 is opened by operating the recording stop switch of the keyboard input device 1C Even if a power outage occurs, data is not transferred and recorded on the magnetic tape, and information that was input before the power outage but has not been recorded on the magnetic tape is stored in each shift register 2A, 2B, 2C, and 2D. Ru.

In the above-described embodiment, the buffer circuit 7 detects the opening of the ignition switch, and the power-off detection circuit 8, which is an AND circuit using transistors, detects the opening of the ignition switch and the power supply line. A main switch that opens in conjunction with the ignition switch is connected in series with the in-vehicle storage battery 5, and this series circuit is connected to the input terminal of the power supply selection circuit 9. 9a and voltage divider to NAND circuit 1
By connecting to one input terminal of the switch 7d1 buffer circuit 7 and the transistor A
The power-off detection circuit 8 consisting of an ND circuit can also be omitted.

In other words, the power failure detection circuit can be constructed by simply connecting a voltage dividing circuit and lead wires. In the above-described embodiment, the reference oscillator and the IC memory device 2 in the strength time signal input device 1E are configured to switch between the reserve storage battery 6 and the on-vehicle storage battery 5 by the power supply selection circuit 9.
, the encoder circuit 3, the magnetic tape recording device 4, and the control circuit 10 are constantly supplied with power supply voltage from the reserve storage battery 6, and each other circuit is supplied with power supply voltage from the on-vehicle storage battery 5, thereby selecting the power supply. The circuit 9 can also be omitted. Furthermore, if only the input from the keyboard input device 1C is input to the input terminal 10a of the control circuit 10 so that the output signal from the power-off detection circuit 8 is not input, the IC memory can be stored even after the power supply is cut off. The device 2 can store the information recorded on the magnetic tape recording device 4 immediately before the power supply is cut off. In addition, in the case where information is stored in the IC memory device 2 even after the power supply is cut off, after the power supply is cut off, the IC memory device 2 is supplied with power for retaining the stored contents from the reserve storage battery 5. Moreover, by always supplying power supply voltage only to the IC memory device 2 from the reserve storage battery 5, the power-off detection circuit 8 can be omitted entirely. Further, in the above-described embodiment, the IC memory device is configured with a plurality of shift registers 2A to 2D, but the number of shift registers may be one or more depending on the number of information to be recorded on the magnetic tape recording device 4. is possible, and the IC can be stored using other digital C memories other than shift registers.
In some cases, the IC memory device may be configured with an analog IC memory, and in this way, the IC memory may be configured with an analog IC memory. It is also possible to omit the encoding circuit 3 when configuring the device. As described above, in the recording device of the present invention, information from an information input device is temporarily stored in an IC memory device with a predetermined capacity, and this IC
The information stored in the memory device is recorded on the magnetic tape of the magnetic tape recording device, and even after the power supply from the vehicle power source is cut off, such as by turning off the ignition switch or disconnecting the wiring from the vehicle power source, the vehicle power source Since the C memory device is supplied with power for retaining the stored contents from the spare storage battery charged by The IC memory device can magnetically record each piece of information stored in the IC memory device, and even if the power supply from the on-vehicle power source is cut off before the recording on the magnetic tape is completed after the information is generated, the IC memory device It is possible to retain the information stored in the internal memory without losing it, and therefore prevents frequent power offs such as ignition switches, etc.
Even if the power line is cut off due to an unexpected accident, valuable information will not be lost and will be reliably retained in the IC memory device, which can be expected to have a great effect. Since the analysis can be easily performed electrically, it is expected to be effective in terms of vehicle design and traffic safety.

Furthermore, the present invention provides power to the magnetic tape recording device from the backup storage battery even after the power supply from the on-vehicle power source is cut off.
Since the information stored in the 1C memory device is recorded on the magnetic tape recording device when the power supply is cut off, the information stored in the IC memory device immediately before the power supply from the vehicle power source is cut off is recorded on the magnetic tape. Therefore, it is possible to record data more reliably, and therefore, even if the backup storage battery becomes over-discharged after this, there is an excellent effect that information can be reliably prevented from disappearing.

[Brief explanation of drawings]

FIG. 1 is a program diagram showing one embodiment of the recording device of the present invention, FIG. 2 is a specific electrical circuit diagram of a power failure detection circuit used in the device of the present invention shown in FIG. 1, and FIG. A specific electrical circuit diagram of the power supply selection circuit used in the device of the present invention,
FIG. 4 is a time chart showing recording timing on a magnetic tape and phase-modulated information in the apparatus of the present invention shown in FIG. 1... Information input device, 2... IC memory device, 4... Magnetic tape recording device, 5...
...In-vehicle storage battery as an in-vehicle power source, 6...
Spare storage battery, 8...Power failure detection circuit.

Claims (1)

[Claims] 1. An information output device that generates information to be input into a vehicle;
An IC memory device with a predetermined capacity that temporarily stores information generated in this information input device, a magnetic tape recording device that records information stored in this IC memory device, and an IC memory device that temporarily stores information generated in this information input device, a magnetic tape recording device that records information stored in this IC memory device, and a power-off detection circuit that detects interruption of the power supply from the on-vehicle power supply such as disconnection and gives a recording start signal to the magnetic tape recording device; and a power-off detection circuit that is charged by the on-vehicle power supply and detects the interruption of the power supply. An information recording device for a vehicle, characterized in that the information recording device for a vehicle is provided with a backup storage battery that provides power for retaining stored contents and power for driving the IC memory device and the magnetic tape recording device even after the IC memory device and the magnetic tape recording device have been stored.