JPS6327232Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device that calculates and displays the degree of fatigue due to driving, and relates to a device for calculating the degree of driving fatigue that accurately displays the display.

When driving long distances by car, fatigue caused by continuous driving for long periods of time tends to cause a decline in forward alertness and drowsiness while driving. For this reason, a driving fatigue level calculation device has been proposed that urges the driver to take a break according to the fatigue level by calculating and displaying the fatigue level.

The driving fatigue level calculation device counts the driving time T _D and rest time T _R and performs a predetermined calculation (T = T _D −4T _R ).
Calculate the cumulative operating time T, and as shown in Figure 1,
Ranking (A~
F) The display unit 1 indicating the current driving fatigue level is displayed in accordance with the calculated cumulative driving time T.

By the way, the driving time _TD is the time when the handbrake is released or the shift lever is shifted to the drive position to start driving, and then the handbrake is pulled after the vehicle stops traveling. , or when the continuation of the operating state, such as when the shift lever is shifted to the parking position, does not reach a certain period of time (for example, 5 minutes) _TO , it is the time until the operating state stops. Further, the rest time _TR is the time from the start of the operation after stopping running to the above-mentioned operation taken to start driving when the continuation of the operation state reaches a certain time _TO . That is, in calculating the cumulative driving time T, the handbrake is pulled or the shift lever is shifted to the parking position in order to avoid misjudging a temporary driving stop operation performed when waiting at a traffic light or the like as a break. Until the continuation of the predetermined operation stop operation reaches the specified time T _O , a predetermined calculation is performed assuming that the operation is in progress, and when the specified time T _O has elapsed, the predetermined operation stop operation is performed for the purpose of starting a break. It is determined that the movement was taken as a break time, and the specified time T _O is counted up to the rest time T _R.
Calculation of cumulative operating time T was being performed. Therefore, even if the driver looks at the fatigue level display and performs a predetermined operation to stop driving, such as pulling the handbrake to start a break or shifting the shift lever to the parking position, the specified period of time T _O
Since it is determined that the user is driving during this period, the level display section 1 indicating the degree of fatigue changes in the direction of increasing the degree of fatigue based on the calculation result of the cumulative driving time T based on the driving time T _D counted during the certain period of time. There is a risk that the condition may change, causing the driver to feel strange.

This idea was made in view of the above, and in order to make the display accurate in a device that counts driving time and rest time and calculates and displays the driver's fatigue level using a predetermined calculation. A means for detecting the occurrence of a stop operation and outputting a stop signal is provided, and the calculation of the fatigue level is stopped within a certain period of time from the start of output of the stop signal, and the output of the stop signal is If the operation stop signal does not continue for a certain period of time, the time from the start of output of the operation stop signal to the output stop is counted as the operation time, and when the output of the operation stop signal continues for the specified period, the specified period is counted as the rest time. Then, calculation of fatigue level is restarted using the respective counting results.

Embodiments of this invention will be described below with reference to the drawings.

Figure 2 shows an example of this invention.
Reference numeral 1' indicates a display unit, and 3 indicates an operation unit that detects the stop state of a vehicle stop device, such as when a handbrake is pulled or a shift lever is shifted to a parking position, by the driver, and outputs a stop signal. Stop operation detection means, 5 is an ignition switch (hereinafter simply referred to as "IGN switch"), 7 is operation stop operation detection means 3 and IGN switch 5
It consists of a microcomputer that counts the driving time T _D and the rest time T _R based on the output signal from the driver, calculates the driver's fatigue level by a predetermined calculation, and displays the result on the display unit 1'. This is a means of calculating driving fatigue level. In addition, the calculation method is
It has a configuration including a CPU 9, a ROM 11, a RAM 13, and an input/output port 15.

Next, we will explain the operation of this embodiment using the CPU shown in Figure 3.
This will be explained based on the processing flowchart of No. 9.

The CPU 9 is caused to start driving when the IGN switch 5 is turned on, and first calculates the time during which the engine has been stopped, that is, the rest time _TR . That is, the time difference between the time when the IGN switch is turned on and the time t _O when the IGN switch 5 was last turned off stored in the RAM 13 (step 250, which will be described later) is calculated (steps 100 and 110). The cumulative driving time T is calculated using the calculated rest time _TR , and the level of driving fatigue is displayed according to the calculated result (steps 120 and 130).

Next, the presence or absence of an operation stop signal is detected, and
If there is no input, the process goes to step 150, and if the input is in progress, the process goes to step 200. Proceeding to step 150, if a predetermined operation stop operation has not been performed, the engine executes a processing loop that counts the operating time T _D , uses the counted time to calculate the cumulative operating time T, and displays the degree of driving fatigue. The process is repeated until a stop or operation stop signal is input (steps 140 to 190).

On the other hand, when proceeding to step 200, that is, when a predetermined operation stop operation is performed, counting of the operation time T _D and rest time is stopped, and the elapsed time from the start of input of the operation stop signal is counted. It is determined whether the elapsed time has reached a certain time (for example, 5 minutes) T _O (steps 200 and 210). Then, when the elapsed time reaches a certain time T _O ,
It is determined that the predetermined operation stop action taken before the specified period of time _TO is for the purpose of rest, the specified period of time _TO is counted as the rest period _TR , and the counted rest period _TR is used. The process proceeds to step 170 to calculate the cumulative operating time T (steps 220 and 23).
0). Conversely, if the elapsed time has not reached the predetermined time T _O , it is confirmed that the IGN switch 5 is on, and the process returns to step 140, but here the input of the operation stop signal is stopped, that is, when the predetermined time is reached. When it is detected that the state of the operation stop operation has been canceled, it is determined that the predetermined operation stop operation taken before the elapsed time (<T _O ) was temporary due to waiting at a traffic light, etc. The process proceeds to step 150 to count the elapsed time to the driving time and restart calculation of the cumulative driving time T (steps 210, 190, 1).
40). Note that when it is detected in step 190 that the IGN switch 5 has been turned off, the detection time is
t _O is memorized (step 250).

As explained above, according to this invention, in a device that calculates and displays the fatigue level of a driver by counting driving time and rest time and using a predetermined calculation, fatigue level is determined within a certain period of time from the start of a predetermined operation stop operation. When the operation stop operation state is canceled within the specified period of time by discontinuing the calculation of the operation stop operation state, the time from the start of the operation stop operation state to the cancellation is counted as the operation time, and the operation stop operation state is canceled within the specified period of time. When the driving time and the rest time are exceeded, the specific period of time is counted as the break time and the calculation of the fatigue level is restarted using the respective counting results. The degree of driving fatigue can be accurately displayed according to the counting results.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of the display unit and display method in the driving fatigue level calculation device, Figs. 2 and 3 show examples of this invention, Fig. 2 is a circuit block diagram, and Fig. 3 is a diagram showing an embodiment of the invention. FIG. 3 is a processing flowchart. Explanation of the symbols representing the main parts of the figure, 1'...
Display section, 3... Operation stop operation detection means, 5...
IGN switch, 7...Driving fatigue level calculation means.

Claims (1)

[Scope of utility model registration request] In a device that calculates and displays the driver's fatigue level using a predetermined calculation by counting driving time and rest time, the driver's driving stop action is detected by a vehicle stopping device such as when the handbrake is pulled or the shift lever is in the parking position. means for detecting the stop state of the operation stop signal and outputting the operation stop signal; means for stopping the calculation of the fatigue level within a certain period of time from the start of output of the operation stop signal; If the output does not continue, the time from the start of the output of the operation stop signal to the output stop is counted as the operation time, and when the output of the operation stop signal continues for the specified period of time, the specified period is counted as the break time, and 1. A driving fatigue level calculation device comprising means for restarting calculation of fatigue level.