JP2004318266A - Display device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device for a vehicle enabling safer operations by optimally outputting a display output from an existing inner display device according to the awakened state of a driver. <P>SOLUTION: This display device 100 for the vehicle comprises a display part 6, a vehicle state detection part 1, a driver state detection part 2, and an awakened state determination part 3 determining the awakened state of the driver on the basis of the state information of the vehicle and the state information of the driver. In the display device 100, there is provided a display change part 4 changing the display of the display part 6 on the basis of the determination of the awakened state determination part 3. Thereby, since the display part 6 can be changed according to the awakened state determined by the awakened state determination part 3, the driver can operate the vehicle with the optimal awakened state. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicular display device that changes a display on a display means in a vehicle according to a degree of awakening of a driver.
[0002]
[Prior art]
Conventionally, the arousal level of a driver is determined, and if the determined arousal level is equal to or less than a predetermined value, it is determined that the driver is dozing, and the arousal level of the driver is increased, that is, A display device for a vehicle that outputs a stimulus signal for waking up has been devised.
[0003]
For example, as described in Patent Literature 1, vehicle state detecting means for detecting vehicle speed, engine water temperature, oil temperature, engine speed, and the like, and driving based on a driver's heart rate, blinking state, and operating state. Driver state detecting means for detecting a physiological state of the driver, and visual recognition detecting means for detecting the driver's visual recognition of the display device of the vehicle. A display device for a vehicle including a detection unit and a stimulus signal generation unit that generates a light stimulus or a sound stimulus to the driver based on each detection information from the visual recognition action detection unit. If it is determined from the detected information that the driver's awakening level is low = dozing, the stimulus signal generating means outputs a flash signal as a light stimulus or "pawn pawn ..." as a sound stimulus. To tell There are things to say wake up signal is output.
[0004]
[Patent Document 1]
Japanese Patent Publication No. 2993455
[Problems to be solved by the invention]
However, humans are not only in a state of low alertness, but also in a state of high alertness (for example, when they are panicking or angry) during driving work that requires careful judgment and agile action Even in the case of the above, a mistake in driving operation is likely to occur.
[0006]
In the vehicle display device as described above, since the stimulus signal is output only when the driver's arousal level is low, that is, when there is a high possibility that the driver is dozing, the detected arousal level of the driver is not suitable for driving. Even if it shows that it is high, it has no effect to make the driver's driving safe.
[0007]
Also, the dozing state of humans is awakened by an acute stimulus (light stimulus or sound stimulus) for a period of time, but when the stimulus stops, the arousal level decreases again, and there is a tendency to enter a dozing state, Even when the stimulus (light or sound) is output only when the arousal level is lower than the predetermined value, the effect of preventing the driver from constantly falling asleep may be low.
[0008]
In addition, in order to output a stimulus signal, for example, to output a flash signal (light stimulus), it is necessary to newly install a dedicated light source, and similarly, to output an alarm signal (sound stimulus). However, it is necessary to provide a dedicated speaker or to install the speaker so as to be output to an existing music speaker as an external signal, and there is a problem that the mounting or the installation takes time.
[0009]
The present invention has been made in view of the above points. That is, the display output from the existing display device in the vehicle is changed according to the driver's arousal level, and the driving operation can be performed with the desired arousal level, so that a display for a vehicle that enables a safer driving operation. The purpose is to provide the device.
[0010]
[Means for Solving the Problems]
The vehicle display device according to claim 1, wherein the display unit displays information of each part of the vehicle, a vehicle state detection unit that detects a state of the vehicle, and a driver state detection unit that detects a state of the driver. Arousal level determination means for determining the arousal level of the driver based on the vehicle state information detected by the vehicle state detection means and the driver state information detected by the driver state detection means; And a display changing means for changing the display on the display means based on the determination by the arousal degree determining means.
[0011]
According to the present invention, when it is detected that the driver's arousal level is low (drowsy state), the driver is awakened from the dozing state, and the driver's awakening level is high (the driver is unsuitable for driving work. In the (state), the display means can be changed in each case so as to lower the arousal level in order to calm down, so that the driver can perform the driving work with the optimal arousal level.
[0012]
3. The vehicle air conditioner according to claim 2, wherein the display change unit is configured to display a color of the display unit when the determination by the arousal level determination unit determines that the driver has a higher arousal level than a predetermined level. Is changed to a warm color system, and when it is determined that the arousal level is lower than a predetermined value, the display color is changed to a cool color system.
[0013]
According to the present invention, the display color of the existing display means in the vehicle can be set to a display color that is optimal for the arousal level of the driver.
[0014]
4. The air conditioner for a vehicle according to claim 3, wherein the display changing unit changes the brightness of the display unit when the determination of the arousal level determination unit determines that the driver has a higher arousal level than a predetermined level. If the awakening degree is determined to be lower than a predetermined value, the brightness is changed to be higher.
[0015]
According to the present invention, it is possible to make the luminance of the display means already installed in the vehicle optimal for the arousal level of the driver.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
A vehicle display device 100 according to one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram schematically showing a configuration of a vehicle display device 100 according to the present invention. The vehicle display device 100 of the present invention includes a vehicle state detection unit 1, a driver state detection unit 2, an awakening degree determination unit 3, a display change unit 4, and a display unit 5.
[0017]
The vehicle state detection unit 1 is formed by collecting a plurality of sensors (not shown) described later, and transmits information detected by these sensors to an awakening degree determination unit 3 described later.
[0018]
These sensors include, for example, an accelerator opening sensor, a steering angle sensor, a brake depression force sensor, and the like. The accelerator opening sensor detects an average value or a variance value of the accelerator opening (ACS change amount) per unit time, It is transmitted to the arousal level determination unit 3.
[0019]
Similarly, the steering angle sensor detects the average value or the variance of the amount of change in the steering angle per unit time, and the brake pedal force sensor detects the value equivalent to the pedal force from the hydraulic pressure of a braking device (not shown) of the vehicle. It is transmitted to the degree judging unit 3. The vehicle state detection unit 1 corresponds to a vehicle state detection unit described in the claims.
[0020]
The driver state detection unit 2 is also a group of a plurality of sensors (not shown) described later, and transmits information detected by these sensors to an awakening degree determination unit 3 described later.
[0021]
These sensors include, for example, a blink sensor, a body temperature sensor, a pulsation sensor, and the like. The blink sensor detects the blink frequency (opening and closing time) per unit time of the driver, and the awakening degree determination unit 3 Has been communicated to.
[0022]
Similarly, the body temperature sensor and the pulsation sensor detect body temperature, heart rate, and pulse information per unit time, respectively, and transmit the information to the arousal level determination unit 3.
[0023]
The blink sensor is disclosed in detail in pages 41 and 42 of "Automotive Engineering, June 1996" (published by Railroad Nippon), in which the opening and closing of a driver's eyelids is detected and transmitted. And are known.
[0024]
The driver state detecting section 2 corresponds to a driver state detecting means described in the claims.
[0025]
The awakening determination unit 3 is a part of the ECU connected to the above-described vehicle state detection unit 1 and the driver state detection unit 2, and based on the respective information transmitted from the two detection units, Is determined.
[0026]
The judging steps are, for example, 10 steps from 1 to 10, the arousal levels 1 to 3 are low arousal levels, and are not suitable for driving work, including a dozing state, and the arousal levels 4 to 7 Is a middle arousal level, which is appropriate for driving work; arousal level 8-10 is a high arousal level, which may cause panic, anger, or in-car audio This state is unsuitable for driving work as in the low arousal level stage. The wakefulness determination unit 3 corresponds to wakefulness determination means.
[0027]
The display change unit 4 is a calculation unit that occupies a part of the same ECU as the arousal level determination unit 3, and is connected and described later based on the arousal level information of the driver determined by the arousal level determination unit 3 described above. The display unit 6 existing in the vehicle in which the vehicle is located, for example, various instruments of the vehicle, a display device of a navigation device (not shown), and a control for changing a display such as a HUD are performed.
[0028]
The display contents changed and controlled by the display change unit 4 are mainly display colors and luminances. For example, if the arousal level determination unit 3 determines that the driver is in the high arousal level stage (rousal level 8 to 10), The display of each of the display devices constituting the display unit 6 is changed to a warm color system having an effect of lowering the arousal level, and the luminance is reduced by a predetermined ratio, for example, several% to several tens%. Control the display device.
[0029]
If it is determined that the wakefulness level is low (a wakefulness level 1 to 3), the color is changed to a cool color system that has the effect of increasing the wakefulness, and the luminance is increased by a predetermined ratio, for example, several percent to several tens percent. Each display device is controlled to output the data.
[0030]
Further, if it is determined that it is the middle arousal level stage (arousal level 4 to 7), the display color is not changed and the current state is maintained, or the display color is changed to an intermediate color between the low arousal level and the high arousal level. Control each display device.
[0031]
In this case, the existing instruments (speedometer, tachometer, etc.) in the vehicle directly control the display color and brightness, but in the case of a navigation device or a HUD (head-up display) separately equipped with a display control unit. Transmits a control signal to these display control units to change the display color and luminance. The display change unit 4 corresponds to a display change unit described in the claims.
[0032]
The display pattern of the display unit 6 may be changed in addition to the display color and luminance described above.
[0033]
The display unit 6 is divided into existing instruments in the vehicle, a navigation device, a HUD (head-up display), and the like separately provided in the vehicle.
[0034]
Existing instruments include speedometers, tachometers, fuel gauges, thermometers, odometers, trip meters, A / T shift indicators, door opening lamps, and other instruments that may be in the driver's view. All apply.
[0035]
In particular, the meters of self-luminous analog meters (optitron meters) or digital meters used in speedometers and tachometers, etc., have a large total light emission compared to other meters. Therefore, the driver can easily enter the driver's field of view or the driver's gaze time is long, so that the display content (display color and brightness) of the present invention is changed to contribute to stabilization of the occupant's awakening degree. Could be great.
[0036]
In the present embodiment, the arousal level determination unit 3 and the display change unit 4 are described as an integrated ECU as the control unit 5, but may be separate units. The display unit 6 corresponds to a display unit described in the claims.
[0037]
The operation of changing the display content according to the arousal level of the vehicle display device 100 having the above-described configuration will be described with reference to the flowchart of FIG.
[0038]
In step S1 in FIG. 2, information such as the state of the vehicle, for example, the accelerator opening per unit time, the amount of change in the steering angle, the value equivalent to the pedaling force, and the like is acquired.
[0039]
In step S2, information about the driver's state, for example, blink frequency per unit time, body temperature, heartbeat, and pulse is acquired.
[0040]
In step S3, the degree of awakening of the driver is determined from the state information of the vehicle acquired in steps S1 and S2 and the state information of the driver.
[0041]
For example, when the body temperature, the heart rate, etc. are high and the blink frequency is low, and the accelerator opening per unit time and the value equivalent to the brake pedaling force are larger than predetermined values, the driver's awakening level is high. It is determined that there is.
[0042]
In a state where the body temperature, the heart rate, etc. are low and the blink frequency is high, if the accelerator opening per unit time and the value equivalent to the brake pedaling force are smaller than predetermined values, the awakening degree of the driver is at a low stage. Is determined.
[0043]
In step S4, if the arousal level determined in step S3 is a low arousal level (1 to 3 levels of arousal level), the process proceeds to step S5, and the display color of the display output by the display unit 6 is changed to a cool color display. The color is changed so that the luminance is displayed higher than a predetermined value.
[0044]
Also, in step S4, if the arousal level determined in step S3 is not low arousal level (1 to 3 levels of arousal level), the process proceeds to step S6, and the arousal level determined in step S3 is high arousal level. (Waking degree 7 to 9) is determined.
[0045]
In step S6, if the arousal level determined in step S3 is a high arousal level, the process proceeds to step S7, where the display color output from the display unit 6 is set to a warm color display color and the luminance is set to a predetermined value. Is changed so as to display DOWN than the value of.
[0046]
In step S6, if the arousal level determined in step S3 is not the high arousal level, the process proceeds to step S8, and the display colors of the display output by the display unit 6 are changed to the cool color display color and the warm color display color. The display color is set to an intermediate display color, and the luminance is set to an intermediate luminance between the luminance set in step S5 and the luminance set in step S7.
[0047]
With the above-described configuration and operation, the display output from the existing display device in the vehicle is set to an optimum output in accordance with the degree of awakening of the driver, and a display device for a vehicle that enables more safe driving work Can be provided.
[0048]
(Modification)
In the above-described embodiment, the awakening degree is determined from the acquired vehicle state information and the driver state information, and the display contents of the existing display devices of the vehicle are appropriately changed according to the determined awakening degree. If the time of the high arousal level or the low arousal level, which is unsuitable for the driving operation, has continued for a longer time than a predetermined time, a notification means for notifying the user by voice may be provided.
[0049]
The state in which the high arousal level or the low arousal level stage, which is unsuitable for driving a vehicle, has continued for a longer time than a predetermined time is considered to be, for example, drunk driving due to drinking or sudden heart attack attacks during driving. Can be
[0050]
If these states continue for a predetermined time, for example, 1 minute or more, by a timer (not shown), changing the display color and brightness of each existing display device changes the driver's awakening stage. Since it is not possible to make a transition to a state desirable for driving work, an existing or newly installed speaker (not shown) is in a state unsuitable for driving. A voice recommending that the driver does not perform the driving operation is output to the vehicle interior.
[0051]
This makes it possible to perform safer driving work.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a schematic configuration of a vehicle display device 100 according to an embodiment of the present invention.
FIG. 2 is a flowchart showing a flow of an operation performed by the vehicle display device 100 to change to a display content corresponding to a determined arousal level.
[Explanation of symbols]
1 vehicle state detection unit (vehicle state detection means)
2 Driver status detection unit (driver status detection means)
3 Arousal level determination unit (Arousal level determination means)
4 Display change part (display change means)
5 control unit 6 display unit (display means)
100 Vehicle display device

Claims (3)

Display means for displaying information of each part of the vehicle;
Vehicle state detection means for detecting the state of the vehicle,
Driver state detection means for detecting the state of the driver,
Based on the vehicle state information detected by the vehicle state detection unit and the driver's state information detected by the driver state detection unit, a wakefulness determination unit that determines the wakefulness of the driver. A display device for a vehicle comprising:
A display device for a vehicle, comprising: display change means for changing a display of the display means based on the determination by the arousal degree determination means. The display change unit changes the display color of the display unit to a warm color system when the driver determines that the arousal level is higher than a predetermined value, and the driver determines that the arousal level is a predetermined value. The display device for a vehicle according to claim 1, wherein the display color is changed to a cool color system when it is determined that the display color is lower than the display color. The display change unit, when the determination by the arousal level determination unit, the driver determines that the arousal level is higher than a predetermined value, changes the brightness of the display unit to be lower, and the arousal level is lower than a predetermined value. The vehicle display device according to claim 1, wherein when it is determined that the brightness is higher, the brightness is changed to be higher.

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