JPS626394A - Operation recorder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an automobile operation recording device, and in particular to an operation recording device suitable for recording when an external input signal changes over time during vehicle operation. Regarding.

(Background of the Invention) For example, as shown in Japanese Unexamined Patent Application Publication No. 58-84394, a conventional device uses a constant input signal (e.g., engine rotation speed data, etc.) especially with respect to an external input signal that changes over time. The data captured at the sampling time was recorded as is.In other words, with this method, even if the data is the same as the data from the previous sampling, that data is stored, which shortens the sampling time. In this case, the memory capacity used for data storage increases, and no consideration is given to the effective use of the limited memory capacity.

Furthermore, in JP-A-59-30184, the vehicle speed is sampled using a linear interpolation method, and the data is not stored in the memory when the vehicle speed changes within ±3 km/h. is stated,
No consideration was given to external input data that changes over time other than vehicle speed data as in the present invention.

[Purpose of the invention]

The purpose of the present invention is to make effective use of limited memory capacity and store as much long-term data as possible in memory by recording data input from the outside together with the time only when the data changes during vehicle operation. An object of the present invention is to provide a driving recording device that takes storage into consideration.

[Outline of this project]

The operation recording device used in the present invention is a device used for operation management of vehicles used in the transportation industry, for example, and in compiling a ``tachograph'' and ``operation record,'' vehicle speed data, work content data, time, etc. Data such as vehicle number data are handled, but in order to create data that takes into consideration fuel consumption during vehicle operation, data such as engine rotation speed is required.

There are also requests for temperature data on refrigerated vehicles.

In this case, it is not advisable to periodically sample this data and store it in memory in terms of efficiency in using the limited memory capacity.

Therefore, in the present invention, by storing the data and the time of change in the memory only when the input signal changes, it is possible to store as much data as possible with the limited memory capacity. .

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a diagram showing the appearance of the operation recording device implemented this time, and this device is roughly divided into the following three parts.

In other words, the main body of the device shown by 10 (hereinafter referred to as the on-vehicle device main body) is inserted into the main body of the on-vehicle device while the vehicle is in operation, and stores information necessary for operation management such as vehicle speed and vehicle number 2 work data along with time. It consists of a memory cassette 30 for storage, and a hand-operated unit 20 connected to the vehicle-mounted device via a cable 14.

Here, the in-vehicle device main body 10 includes a memory cassette eject switch 12 and a lamp 13 which indicates that the operation recording device is operating normally when the memory cassette 5 is installed. A window 11 is provided for inserting a plate with a vehicle number written on it.

In addition, the one-hand operation unit 20 includes a keyboard 22 for inputting various data, and a 5x7 dot matrix 16-digit liquid crystal display 21 for displaying input data and time data.
is installed.

Figure 2 shows the memory cassette 30 taken out from the in-vehicle unit.
Shows the appearance.

It has an anti-slip groove 31 engraved on the exterior, and 32 indicates a transparent lid for inserting the driver code.

Next, FIG. 3 shows a block diagram of the operation recording device of this embodiment.

Part (A) shows the main body of the in-vehicle device, including the CPU 100 and the CPU
4 KB written with instructions to operate U
ROM10I, RAM102. It is composed of a clock IC 103, a data parallel-to-serial conversion IC 104 for serial communication with a memory cassette, an interface section 105 thereof, and a power supply section 106 of the device.

The power supply 106 is divided into two systems, and +5V is always output when the vehicle's storage battery is connected.
7 is that-, (A) part CPU100, ROM10I
, the RAM 102, and the clock IC 103 are always in the ON state, and in particular, the RAM 102 is backed up when the memory cassette 8 is not installed, and the clock IC 103 performs timekeeping operation.
Ru.

The other is switch 1, which is turned on when the memory cassette is installed.
08, the power output 109 becomes +5V, and (B
It is used as a power source for all of the sections ) (hand-held operation section), section (C) (memory cassette section), and the memory cassette interface section of section (A).

Further, the switch 12 is a memory cassette eject switch, and this signal is received by the interrupt input terminal of the CPU 100, the time at that time is recorded in the memory cassette, and when the CPU 100 turns on the solenoid 110, the memory cassette is removed. It is ejected from the onboard machine body.

Further, 111 is an input terminal for an output signal from a vehicle speed sensor, and in this embodiment, a signal of 24 pulses/rotation is input.

Reference numeral 112 indicates external signal input terminals that play an important role in the present invention, and in this embodiment, there are five (5 bits) binary logic signal input terminals.

(B) fflHt, hand control unit Tear 4J, CPU 100
ROM201. RAM 202 and data display section 20
3. Consists of a data input keyboard section 204, and data transfer between the in-vehicle device main body and the handheld operation section is performed directly through a serial communication port built into the CPU.
This is done via cable.

Section (C) is a memory cassette section, in which the CPU 300,
ROM301, RAM302 for storing operation management data. It is composed of a serial communication interface section 303.

Here, details of an embodiment using an external input terminal according to the present invention will be described.

In this embodiment, in order to obtain the engine rotation speed, the engine rotation speed data is not directly recorded at each sampling time, but the gear position data is input to the external input terminal, and the gear position data is input only when the gear position changes. Record data to memory cassette.

A flowchart of a program related to this invention will be explained using FIGS. 4, 5, and 6.

Figure 4 shows the reset processing/main routine of the on-vehicle unit, and when a memory cassette (hereinafter referred to as M/C) is inserted into the on-vehicle unit, the on-vehicle unit is reset by hardware. It starts and starts. After initializing each part, a start signal is sent to the keyboard and M/C. M/
By receiving the return code from C, the inserted M/C determines whether all contents have been cleared, and if all the M/C data has been cleared, new vehicle number data, Year, month, date 2 Work start time data, etc. are written in the predetermined area shown in FIG. If all are not cleared, these data will not be written, and vehicle speed data, work data, etc. will be written starting from the data written last in the daily report area and tacho area.

Additionally, if the power to the in-vehicle device is turned off (due to battery disconnection, etc.), the time data and vehicle number data in the in-vehicle device are no longer guaranteed, so in this case, a message to that effect will be displayed on the keyboard. This will prompt you to reset your data, and.

Sends time data to be displayed on the keyboard.

Move to main routine (loop). Normally, the in-vehicle device goes around this loop.

Next, in the iRQ interrupt processing of the in-vehicle device main body.

Data is taken in from the external input terminal of the present invention.

FIG. 5 is a flowchart showing this situation.

In addition to importing external input, this processing routine also imports vehicle speed data, sends time display data to the keyboard every minute,
This is a routine for receiving data from the M/C.

Here, every 250+*gsc, the on-vehicle unit takes in the value of the vehicle speed counter and sends it to the M/C as vehicle speed data.
Next, the data at the external input terminal is compared with the state 250 m5ec ago, and if there is a change, the data is transmitted to the M/C.

It also sends time data to the keyboard every minute. If data is coming from 1M/C, it will take in the data from M/C and process it. In this case, the data from the M/C is data indicating the state of the M/C itself.

FIG. 6 is a flowchart of the M/C program, and FIG. 7 is a data area map of the M/C.

When the M/C is inserted into the vehicle-mounted device main body, a reset processing routine is started and a loop is entered after initializing each part.

When data is received from the vehicle-mounted device, a sci processing routine is activated each time to perform processing corresponding to the received data.

If data is now being transmitted from the external input terminal from the vehicle-mounted device main body, this data is shown in FIG. Temporarily store external input data in the work area.

This area stores 2 data with a minimum interval of 0.25m5ec.
It has a 96-byte area so that it can be stored for 4 seconds, and with that Add as the time axis, data is written to the Add corresponding to the time of the change point.

Specifically, when vehicle speed data is transmitted from the on-vehicle device every 0.25 m5ec, it is temporarily stored in the speed raw data area shown in FIG. Like the external input data work area, this area also has a 96-byte configuration with Add as the time axis, and the time (Add) is synchronized with the external input data.

Here, when the speed data reaches 24 seconds, all the speed data is moved to the -phase tacho data work area, data compression calculation processing is performed in a fixed format, and the data is sequentially recorded in the tacho data area shown in Figure 7. go. Next, extract the external input data that forms the basis of the present invention from the external input data work area, calculate the time from that Add, and add it together with the external input data (each as 1-byte data).
Record in the tacho data area.

Next, this method will be described in detail.

This method is closely linked to vehicle speed data, and the vehicle speed data includes regular vehicle speed data in which the vehicle speed value is always recorded in the tacho data area every 24 seconds. This data is the basis for determining the time when the tacho data is analyzed later, and is itself recorded as 1-byte data including the vehicle speed and time. This data uses the value of Addφ in the tacho data work area and the external input data work area.

Next, look at the data in the external input data work area, and if data is written to a certain Add, that A
Count what number dd is from the regular time (24 second interval),
The number n (n Xo, 25 sec).

Added as time data after external input data.

Figure 8 is an example of this, and in this case, n=4, so
This means that the external input data changes after 0.25 x 4 = 1 sec from the regular data. That is, it is sufficient to record this φ1φ4 in the tacho data area.

In this example, this method was used to record changes in gear position in tacho data as changes in external input. Since the gear ratio of the car can be determined from the gear position, when analyzing tach data, the engine speed at that time can be easily determined from the vehicle speed and gear ratio at that time in the tach data area. Become.

Furthermore, by using this method and combining it with a temperature sensor and an A/D converter, it becomes possible to record data on the freezer temperature of a refrigerated vehicle in the M/C tacho data area.

It can be applied to a wide range of applications, such as recording the weight of a loading platform in combination with a fuel consumption sensor and a two-weight sensor.

〔Effect of the invention〕

As described above, according to the present invention, by recording the data together with the time only when the external input signal input to the external input terminal changes during vehicle operation, the data can be stored for as long as possible with limited memory capacity. It has the advantage that it can store a large amount of data over time and can be effectively used for many types of input signals.

[Brief explanation of drawings]

FIG. 1 is an external view of the operation recording device in this embodiment, FIG. 2 is an external view of the memory cassette, FIG. 3 is a block diagram of the operation recording device, and FIGS. 4, 5, and 6. 7 shows a flowchart of the program of the driving recorder, FIG. 7 shows a data area map of the memory cassette, and FIG. 8 shows an example of the external input data work area. 10... Vehicle-mounted device main body, 20... Hand operation unit, 3o.
...Memory cassette, 112...External input terminal.

Claims (1)

[Scope of Claims] 1. An operating section including a keyboard for inputting various data during vehicle operation and a display for confirming and displaying the data, vehicle speed input, time data, and data sent from the operating section. In a device consisting of a device main body that can send the data to a memory section for storing the data, and a memory section that can be attached to the device main body and can store the data, it is possible to store input data from the outside that changes over time. input into the device main body at each sampling time of the characteristics,
A driving recording device characterized in that a calculation section provided within the device main body compares the data with previous input data, and stores the data in a memory section only when there is a change in the data. 2. The driving recording device according to claim 1, characterized in that the input data is data other than vehicle speed data.