JPS6357344A - Travel condition memory device - Google Patents

Abstract

PURPOSE:To prevent the waste of a consuming current by operating a memory means and storing various data on traveling conditions in said memory means for a defined period of time, when it is judged that the acceleration of a vehicle becomes above a defined value by an acceleration judging means. CONSTITUTION:When an ignition switch 20 is turned on, first, a CPU 18 judges whether an accelerator judging switch 12 is turned on, i.e., whether the stepping quantity of an accelerator pedal 10 is above a defined value. And, when judged an accelerating condition in which the stepping quantity is above the defined value, the data of an accelerator stroke from an accelerator sensor 11, the on/off of a brake switch 14, a vehicle speed from a vehicle speed sensor 15 are read and stored into a RAM 19 for a defined period of time (about 5sec). And, if, e.g., a collision accident occurred, various data on a traveling condition stored in the RAM 19 are read and used for analyzing the cause of the accident.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for storing the running conditions of a vehicle, such as the running speed of the vehicle and whether or not the brakes are used. Records of driving conditions made by such a device are used to analyze the cause of an accident, especially when a major collision occurs.

(Prior Art) Conventionally, there is a device as shown in FIG. 7 as a device for recording the running state of a vehicle (see Japanese Patent Laid-Open No. 15552/1983).

In the same figure, l, 2.3 is a driving state detection sensor that detects the driving state of the vehicle, such as the vehicle's running speed, brake pressure, steering angle, etc., and 4 is a driving state detection sensor l, 2.
．． 3 is a memory circuit that stores the detection results over time; and 5 is an operation inhibiting means that prohibits the memory circuit 4 from further operation when the deceleration of the vehicle exceeds a certain value. The memory circuit 4 is supplied with power from the hatch lift when the ignition switch 6 is ON, and sequentially updates and stores the detection results input from the driving state detection sensors 1 and 2. When the deceleration exceeds a certain value, the operation inhibiting means 5 prohibits further memory processing, and the relay 8
The vehicle receives power directly from the battery 7 via the battery 7 to maintain the running state for a predetermined period of time (for example, 5 seconds) before the accident occurs. Therefore, in order to analyze the cause of the accident, it is necessary to read out the record of driving conditions held in the memory circuit 4 and analyze whether or not the brake was pressed and to what degree the steering wheel was turned before the accident occurred. Good.

[The problem that the invention attempts to solve]

By the way, in this conventional memory device, while the vehicle is running, the memory circuit 4 is always driven to write data from the running state detection sensors 1 to 3, but this is not the cause of the accident. Generally speaking, major collisions that require analysis are rare cases, and constantly driving the memory circuit 4 during normal driving is wasteful in terms of power consumption and may cause deterioration of the device. There is a problem in that it can also be a cause of haste.

Therefore, the present invention aims to efficiently operate the storage means and other devices constituting the driving state storage device d to prevent consumption of current, and to prevent deterioration of these devices to maintain their reliability. With the goal.

[Means for solving the problems] In order to achieve the above objectives and solve the problems of the prior art,
The driving condition storage device according to the present invention is provided with a driving condition detecting means for detecting the driving condition of the vehicle with respect to a predetermined detection item, and a storing means for storing the detection result of the driving condition detecting means. Provided with an acceleration determination means for determining that at least one of the pedal depression amount and the throttle valve opening amount exceeds a predetermined value,
The storage means is driven based on the determination result of the acceleration determination means.

[Effect]

According to the present invention, when the acceleration determining means determines that the vehicle is in an accelerated state exceeding a predetermined value, the storage means is activated and various data inputted from the traveling state detection means are stored in the storage means for a predetermined period of time. is memorized. The reason why the present invention is configured to store driving state data when the vehicle accelerates is that in the event of a major collision that requires analysis of the cause of the accident, when the vehicle is overtaking the vehicle in front or when the vehicle is swayed while trying to avoid a collision,
This is based on a rule of thumb that this often occurs when the vehicle is suddenly accelerating, such as when the accelerator pedal is mistakenly pressed for the brake pedal.

〔Example〕

Hereinafter, the present invention will be described in detail based on the accompanying drawings.

FIG. 1 shows an example of a driving state storage device according to the present invention. In the same figure, lO is the accelerator pedal, 11
1 is an accelerator sensor that detects the amount of depression of the accelerator pedal 10; 12 is an acceleration discrimination switch that outputs a discrimination signal to a subsequent stage when the amount of depression of the accelerator exceeds a predetermined amount;
3 is a brake pedal, 14 is a brake switch that determines whether or not the brake is being used, and 15 is a vehicle speed sensor that detects vehicle speed. 16 is an A/D converter, 17 is CPU1B, R
A memory device for running status consisting of AM 19, CPU
i s is the input various data is acceleration discrimination switch 1
2 is ON for a predetermined period of time (for example, 5 seconds).
Written in 19. The CPU 18 receives power from the battery 21 via the ignition switch 20, or the RAM 19 receives power from the battery via a relay (not shown) or directly without a relay when subsequent storage is prohibited under the control of the CPtJ18. It receives power supply from 21 and retains the written memory.

Next, the operation of this device will be explained.

The processing flow of the storage device fi 17 is as shown in FIG. 2, for example, and when the ignition switch 20 is turned on, the storage device fi 17 is activated every Zoom by an operating system (not shown). When started, C
PU1B first determines whether flag AFP is set (1-1), flag AFP is set when acceleration determination switch 12 is ON, that is, when the amount of depression of accelerator pedal 10 is north of a predetermined value. The flag determination at step (1-1) is to determine whether the vehicle was in a predetermined acceleration state at the previous startup, that is, before LOOms. Then, when the flag AFP is set, step (1-
5), and if it is not set, press step (1).
-2) Then, in step (1-2), it is determined whether the acceleration determination switch 12 is ON or not, and if Yes, the flag AFP and flag ST are set.1-3) (1
-4), if no, clear flag AFP (1-8)
. Therefore, the flag ST is set only when the acceleration discrimination switch 12 was OFF at the previous startup and is now ON. On the other hand, in step (t-S), it is determined whether the acceleration determination switch 12 is ON or not.
If so, keep the flag AFP set (1-6); if No, clear the flag AFP (1-7); then, in step (1-9), determine whether the flag ST is set; If No, the process ends. If Yes, proceed to step (1-10). In step (1-10), determine whether the counter i exceeds 50. If No, proceed to step (1-11). Step At (1-11), the counter i is incremented. Here counter i is 5
If it does not exceed 0, this flow is executed every 100m5, so it means that it is within 5 seconds after flag ST is set. Next, in step (1-12), the accelerator stroke is changed, the vehicle speed is set to V, and the brake switch is turned on or off.
Read the data B of F and store it in each register statement i, Vi, Bi in step (1-13), and also to store when the ignition switch 20 is 0FFL/0FFL within 5 seconds. The value of counter i is stored in register ■. By the way, step (1-10)
When counter i exceeds 50, step (1-14
), it is determined whether the flag AFP is cleared or not, and if it is not cleared, the process ends, and if it is cleared, the flag ST and counter i are cleared in step (1-15) and the process ends. .

Next, an example of the running state of the vehicle and the operation of this device when the vehicle is actually driven will be explained based on FIG.

First, time t. At time 1, the ignition switch 20 is turned on and the vehicle continues to run.
．． When the accelerator is depressed and the vehicle accelerates, the acceleration discrimination switch 12 is turned ON and the flag ST is set at step (1-4) in FIG. 2, and the vehicle running state data is stored for 5 seconds. As described above, the data recorded at this time includes the depression of the accelerator pedal, whether or not the brake is used, the vehicle speed, and the value of the counter i. After that, I drove normally, and when I tried to step on the brake at time t yu to avoid a collision, I got upset and stepped on the accelerator pedal, resulting in a collision at time t4, and I tried to stop the car somehow, but at time ts I turned off the ignition. Switch to 0FFL
/Suppose you then step on the brake. In this case as well, time t
From step 3 onwards, the driving state data is stored. Then, when the contents of RAM 19 are analyzed at a repair shop or the like, it is determined that there was a collision based on the sudden change in vehicle speed, and that the brake was not being depressed at that time, but the accelerator was being depressed. Further, it can be seen that the ignition switch 20 was turned off at time t5 because the value of the counter i stored in the register (2) has not changed.

4 to 6 show a second embodiment of the present invention. Figure 4 shows its basic configuration and shows the above-mentioned first
In addition to the illustrated embodiment, a collision sensor 25 for detecting a vehicle collision is provided. still.

Components similar to those in FIG. 1 are given the same reference numerals and redundant explanations will be omitted. The processing flow in the storage device 17 is almost the same as that in the previous embodiment, or as a result of providing the collision sensor 25, the processing flow becomes as shown in FIG. That is, when the flow starts, it is determined in step (2-1) whether or not flag F is set, and if it is set, it ends, and if it is not set, it is determined in step (2-1).
-2), flag F indicates the subsequent step (2-5)
If a collision occurs during or after data storage, this flag is set so that data will not be stored even if the acceleration discrimination switch 12 is turned on. Once set, this flag is set. It cannot be cleared. When this flag F is not set, step (2-2) determines whether a collision has occurred, and if Yes (if a collision has occurred), step (2-2) determines whether or not a collision has occurred.
-3), set the flag CRUSH and step (1)
Proceed to -1). If No (when no collision has occurred), proceed directly to step (1-1). Step (1
-1) The subsequent flow is substantially the same as in the previous embodiment, but in this embodiment, when the counter i exceeds 50 in step (1-10), the process proceeds to step (2-4). and step (
In 2-4), it is determined whether the flag CRUSH is set, and if YES, the flag F is set in step (2-5) and the process ends. If no, step (1-14
) and performs the same processing as in the previous embodiment. Figure 6 shows
This figure shows an example of the relationship between the actual driving conditions of a vehicle equipped with such a device and data storage. The relationship between the driving state and data storage is almost the same as that in the first embodiment, or in the case of this embodiment, the flag CRUSH is set when a collision occurs at time t4 (step 2-- in FIG. 5). 3)
When data storage is completed, flag F is set (step 2-5 in Figure 2). From then on, flag F will not be cleared and new data will not be stored. Therefore, after a collision, take the vehicle to a repair shop. Even if you press the accelerator pedal to accelerate before you go, the data will not be updated and the data at the time of the collision will remain saved. Furthermore, if the above-mentioned flag F is set only during data storage, that is, when acceleration exceeds a certain level, then even if the collision sensor 25 is activated due to a minor collision caused by a driving error at extremely low speed, for example, the original purpose is still set. It will be possible to record data in the event of a major collision. In this embodiment, the collision sensor 25 may be used as means for prohibiting new storage of data, or further storage may be prohibited by detecting a sudden decrease in vehicle speed. In addition to these conditions, the condition for prohibiting the storage of new data includes the case where the ignition switch is turned off while the accelerator pedal is being depressed. The reason why the ignition switch is turned OFF during acceleration is thought to be because the vehicle is agitated in an attempt to avoid a collision and acts to stop the engine. In addition, the present invention starts storing the driving state data when the accelerator pedal is depressed to a predetermined value or more or when the opening amount of the throttle valve reaches a predetermined value or more. Conditions for stopping the operation include stopping the operation when a predetermined time has elapsed from the start of storage in the RAM 19 as in the case of the above embodiment, and also stopping the operation when the amount of depression of the accelerator pedal becomes less than a predetermined value. It may be stopped.

(Effects of the Invention) As explained above, the driving state storage device according to the present invention has the following features:
Since the vehicle running state data is stored when the accelerator pedal is depressed to a predetermined value or more or when the throttle valve opening amount exceeds a predetermined value, the storage device and other detection means can be efficiently driven. This not only prevents wasted current consumption, but also prevents deterioration of these devices and maintains the reliability of the entire device.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing a first embodiment of the driving state storage device according to the present invention, FIG. 2 is a flowchart showing an example of the operation of the device shown in FIG. 1, FIG. 4 is an overall configuration diagram showing a second embodiment of the driving state storage device according to the present invention, and FIG. Fig. 3 is a flowchart showing an example of the operation of the device shown in Fig. 3, Fig. 6 is a time chart showing an example of the relationship between the running state of the vehicle and data stored in the device shown in Fig. 3, and Fig. i7 is a conventional running state storage device. FIG. 2 is a block diagram showing the configuration of FIG. lO...Accelerator pedal 11...-Accelerator sensor 12...Acceleration discrimination switch 13...Brake pedal 14...Brake switch 15...Vehicle speed sensor 17...Storage device 18...CP U19
...RAM 20...Ignition switch 21...Battery patent applicant Nissan Motor Co., Ltd. Representative Patent attorney Kaoru Uezumi 1 No. 111! 1 Fig. 4 (1 father t7?) Fig. 7

Claims (1)

[Claims] A driving state storage device comprising a driving state detecting means for detecting a traveling state of a vehicle with respect to a predetermined detection item, and a storing means for storing a detection result of the driving state detecting means,
Acceleration determining means is provided for determining whether at least one of the amount of depression of the accelerator pedal and the amount of opening of the throttle valve exceeds a predetermined value, and the storage means is driven based on the determination result of the acceleration determining means. Features a driving state memory device.