JPH0421804B2 - - Google Patents

Abstract

PURPOSE:To collect exactly the operation information and to execute its output, by self-holding an electric power source through a start signal responding to an operation, or an output switch signal, etc., and also releasing it. CONSTITUTION:When an engine of an automobile, etc. is started, a start signal 8 becomes a high level, a switch 2 become on, also the switch 2 is held in an on-state by a CPU5, an electric power source of a battery 1 is self-held, and the operation information is collected into a memory 6 through the CPU5. When the automobile stops and the signal 8 becomes a low level, the information which is being collected from an information source 4 is stored in the memory 6, and after that, the CPU5 released holding of the switch 2, and the operation information is collected exactly. On the other hand, in accordance with a moving operation of an output switch 9, holding of the electric power source of the battery 1 and its release are executed in the same way through the CPU5, and an output for reading out the operation information, which is executed when the automobile stops is executed exactly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to control of power on/off of a driving recorder for recording vehicle driving information.

In recent years, various electronic devices have been installed in automobiles, which have various effects in terms of safety, economy, and comfort.

Among these, a driving recording device has been proposed that takes in various types of vehicle information, processes it appropriately, collects and stores the driving data, and outputs the collected contents to a suitable output device.

By the way, the driving power for electronic devices mounted on a car is usually obtained from an existing power supply device consisting of a generator and a battery, and when the car is not in use, the power supply to the electronic devices is turned off to prevent the battery from discharging. It is necessary to cut it off. However, it goes without saying that the above-mentioned driving recording device must memorize and save the collected data even when the car is not in use, and the output of the collected data must be performed when the car is not in use, that is, when the generator is stopped. There are many opportunities to do so. However, simply providing a manual power switch to turn on and off the power of such a driving recorder may result in the driving recorder not being able to perform its original functions due to forgetting to turn on the power.

This invention was made with the aim of solving the above-mentioned problems, and the power to the driving recording device is reliably supplied when the car is in use or collected data is output, and automatically when the car is not in use. The purpose is to provide a driving recording device that can be disconnected.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a driving recorder according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing an embodiment of the switch means, and FIG. 3 is a flowchart showing the operation of the driving recorder. In Figure 1, 1
Reference numeral 2 indicates a battery of the automobile, and 2 is a switch means that controls conduction and disconnection between d and e by the logical sum of control signals a, b, and c. 3 is a constant voltage power supply device, and a battery 1 is supplied through a switch means 2.
The variable voltage is controlled to a predetermined constant voltage and power is supplied to various load elements described later. 4 is a source of vehicle information necessary for operation management, such as a vehicle speed signal and a fuel flow signal. 5 is an information processing device (hereinafter referred to as CPU)
It takes in information from the information source 4, performs predetermined calculations, and exchanges and controls information with each terminal, which will be described later.

6 is a memory for collecting and storing operation data, 7
is an output device for taking out the operation data from the memory 6, such as a printer.

Reference numeral 8 denotes a starting signal for starting the present operation recording device, and is, for example, a signal from the L terminal (or K terminal) of a voltage regulator.

9 is an output switch for giving a command to output operation information to the output device 7;
It is an on/off switch connected to the

Next, the operation will be explained. When the driver rotates the engine to use the car, the generator rotates, and as is well known, a generator voltage is generated at the L terminal of the voltage regulator. That is, a voltage is generated at the output terminal a of the starting signal 8, the switching means 2 is made conductive by this voltage, the voltage of the battery 1 is supplied to the input side of the constant voltage power supply 3, and as a result, the CPU 5 is started. When the CPU 5 starts, it first outputs an H level signal to the signal c in order to self-hold the power supply to ensure the conduction state of the switch means 2, and then determines the cause of the start by looking at the signals a and b. do. In this embodiment, since the signal a is at the H level and the signal b is at the L level, it is detected that the car is in use, and thereafter, the operation information from the information source 4 is finally taken in,
A series of processing is performed in which predetermined arithmetic processing is performed and operation data is stored in the memory 6.

In addition, in parallel with the above arithmetic processing, the signal a and signal b are constantly taken in to determine the device activation conditions. When the output switch 9 is turned on here, the signal b also becomes H level, and the CPU 5 outputs the operation data up to that point via the output device 7. Output device 7
When the predetermined data is output, the output switch 9 is released and the signal b is kept at L level.

Next, when the driver finishes using the car and stops the engine, the output a of the start signal 8 goes to the L level, the CPU 5 detects this and performs post-processing of the data collection work, that is, the data is stored in the memory 6. If writing is in progress, the power supply hold signal c is automatically set to L level until the writing is completed, or after a predetermined data non-volatization process is performed to protect the data contents of the memory 6, and the switch means 2 to refuse. Therefore, operation information during the period when the car is in use is reliably stored in the memory 6, and power loss when the car is not in use can be reduced to almost zero by turning off the constant voltage power supply 3. Can be done. Furthermore, even when the car is not in use, when the output switch 9 is turned on, an H level voltage is generated at the output b, and the CPU 5 is activated in the same manner as described above.

Therefore, it generates a power hold signal c, detects from signals a and b that it is an output device operation command, performs a predetermined operation data output process on the output device 7, and then automatically switches the hold signal c to L.
level and turn off the power. Of course, if the output switch 9 continues to be turned on at this time, the operation data output process to the output device 7 will be repeated again, and as a result, the same data will be output. FIG. 3 summarizes the above operations as a flowchart.

In the above embodiment, an example is shown in which the L terminal (or K terminal) of the voltage regulator is used as the starting signal 8, but a signal from a key switch installed in any automobile may also be used. In addition to the printer, the output device 7 may be a magnetic tape, a semiconductor memory, or a display device such as a cathode ray tube or a liquid crystal panel.

As shown in FIG. 2, an embodiment of the switching means 2 can be constructed of a wired-OR circuit for signals a, b, and c and a switching transistor.

Note that the number of output switches 9 does not have to be one;
For example, when a printer is configured as the output device 7, it goes without saying that a plurality of switches such as a print switch and a paper feed switch may be provided and arranged in parallel in the same configuration as the output switch 9.

As described above, according to the present invention, the power supply of the driving recording device is activated by at least one operation when using the car or when using the output device, and the device itself holds the power supply, and the above operation is performed. The device is characterized by being equipped with an information processing device that removes the hold signal and shuts off the power after completing the predetermined post-processing when the hold signal is removed, thereby reliably collecting operation information while the vehicle is in use. The data can be memorized, and when the car is not in use, the battery can be prevented from discharging. Furthermore, even when the car is not in use, the output device can be activated to output driving data.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an operation recorder according to an embodiment of the present invention, and FIG. 2 is a diagram showing an embodiment of a switch means. FIG. 3 is a flowchart showing the operation of the operation recorder shown in FIG. In the figure, 1 is a battery, 2 is a switching means, 3 is a constant voltage power supply, 4 is an information source, 5 is an information processing device, 6 is a memory, 7 is an output device, 8 is a start signal, and 9 is an output switch. Note that the same reference numerals in the figures indicate the same parts.

Claims (1)

[Scope of Claims] 1. In a driving recording device that captures vehicle driving information, processes it, collects and stores this information, and outputs this information using an output device, the main power source of the device is activated by at least one of the operation of using the automobile or the operation of using the output device, the main power is maintained by a power hold signal output from an information processing device provided in the device, and the operation of using the output device is removed. After the information processing device completes a predetermined process, the information processing device removes the output of the power hold signal and shuts off the main power source.