JP2013248103A - Driver state detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driver state detection device capable of detecting abnormality of a driver in an early stage without a restraint of a driver or the like.SOLUTION: In a driver state detection device 100 including a detection part 2 for detecting the state of a driver and a control part 1 for determining the state of the driver on the basis of information from the detection part 2 and vehicle information, the detection part 2 detects the pressure change of a right leg on a seat surface where the driver sits, the vehicle information is an operation amount of an accelerator pedal of a vehicle, and the control part 1 determines the state of the driver on the basis of the pressure change of the right leg of the driver and the operation amount of the accelerator pedal.

Description

  The present invention relates to a driver state detection device that detects the state of a driver of a vehicle that is sitting and driving.

  Conventionally, there is one disclosed in Patent Document 1. This driver state detection device is a device that detects the state of the driver based on information from the imaging means.

Japanese Patent Laid-Open No. 2005-18656

  Conventionally, the driver state detection device disclosed in Patent Document 1 directly monitors the driver and performs state estimation, and can detect anomalies before appearing in the vehicle behavior, but it is difficult to define a human state. There are problems such as being restricted, depending on the information that monitors the driver.

  Therefore, the present invention focuses on the above-described problems, and an object thereof is to provide a driver state detection device that can detect a driver's abnormality at an early stage without restraining the driver.

  A driver state detection device according to the present invention includes a detection unit that detects a driver's state, and a control unit that determines the state of the driver based on information from the detection unit and vehicle information. In the state detection device, the detection unit detects a pressure change of a right leg of a seating surface on which the driver sits, the vehicle information is an operation amount of an accelerator pedal of the vehicle, and the control unit The state of the driver is determined based on a change in leg pressure and an operation amount of the accelerator pedal.

  Moreover, the said detection part is provided in the right front of the seat surface on which the said driver | operator sits.

  With the above configuration, the present invention provides a driver state detection device that can achieve the intended purpose, can detect the driver's abnormality at an early stage without restraining the driver, and the like. Can do.

The block diagram of the driver | operator state detection apparatus of 1st Embodiment of this invention. The perspective view of the seat of the embodiment. The top view of the seat surface of the seat of the embodiment. Sectional drawing of the seat surface which provided the detection part of the embodiment. The flowchart which shows the judgment method which detects the driver | operator state of the embodiment.

  Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings.

  The driver state detection device 100 of the present invention includes a control unit 1, a detection unit 2, a vehicle information input unit 3, and a notification unit 4.

  The control unit 1 includes a ROM (Read Only Memory) that stores programs and the like, a RAM (Random Access Memory) as storage means used as a work memory, a CPU (Central Processing Unit) that performs control operations according to the ROM program, It is mainly composed of a known microcomputer comprising an I / O port for inputting / outputting signals to / from the outside and a bus line for connecting these.

  As shown in FIG. 4, the detection unit 2 includes a pressure sensor 2a and pressure transmission units 2b and 2c. Note that 210 a is a cushion of the seating surface 210, and 210 b is a skin of the seat 200. In the present embodiment, as shown in FIG. 3, four detection units 2 are provided on the right front side of the seat surface 210 on which the driver sits so as to correspond to the right leg portion of the driver. In addition, D in FIG. 3 has shown the part where the said driver contacts the seat surface 210. FIG.

  The pressure sensor 2 a is a film-type pressure-sensitive pressure sensor, and is provided on a frame 210 c constituting the seat 200.

  The pressure transmission parts 2b and 2c transmit the pressure generated when a person is seated to the pressure sensor 2a. The pressure transmission parts 2b and 2c are made of an elastic member, for example, a soft urethane foam, and the pressure transmission part 2b and the pressure transmission part 2c are securely joined by an adhesive or the like.

  When the driver is seated on the seat 200, the detection value detected by the detection unit 2 is output to the control unit 1. Since the detection part 2 should just detect the pressure concerning the seat surface 210 of the seat 200, you may use a sheet-like pressure sensor.

  The vehicle information input unit 3 connects to a control unit provided on the vehicle side by connecting to a network provided in the vehicle, and acquires vehicle information. In the present embodiment, it is sufficient that only the accelerator opening can be acquired, and the present invention is not limited to the acquisition method of the present embodiment. For example, the accelerator opening is connected to an accelerator sensor that outputs a signal corresponding to the depression amount of the accelerator pedal. May be.

  The notification means 4 is a warning for the driver and passengers when the control unit 1 determines that the driver's condition is abnormal. The sound generating unit 42 is configured to call attention.

  The display unit 41 includes a display panel capable of displaying an image, such as a dot matrix type liquid crystal panel or an organic EL panel, and is connected to the control unit 1 via a drive driver or wiring (not shown), and receives a control signal from the control unit 1. For example, a warning indicating a vehicle display or a driver's condition abnormality consisting of shift position, total travel distance, remaining fuel amount, trip meter, clock display, instantaneous fuel consumption, average fuel consumption, cruising range, external temperature, etc. Display the image. Specifically, the warning display, for example, by flashing a character display such as “decrease in alertness, driving attention” displayed on the liquid crystal panel, or by changing the backlight color of the liquid crystal panel to red, etc. It is a display to call attention to the person.

  The sound generation unit 42 is configured by a speaker, a buzzer, or the like that outputs sound. Specifically, the output sound is output from the speaker, for example, “The awakening level is reduced. The vehicle is stopped and immediately rested. Such as a warning sound output from a buzzer. In this case, the sound generation unit 42 is built in the vehicle meter, but it is also conceivable to use a speaker of an in-vehicle acoustic device, for example.

  As described above, in the configuration of the driver state detection device 100 according to the present invention, the driver state determination method in the driver state detection device 100 according to the present invention will be described with reference to FIG.

  FIG. 5 is a flowchart of the driver state detection determination method according to the present invention.

  First, in step S0, the driver state detection device is activated. This activation is performed, for example, by turning on an ignition switch of the vehicle or by an activation operation of a driver state detection device in an operation unit (not shown) in the vehicle.

  Next, in step S1, each holding data described later is initialized.

  In step S2, the moving average of the past four times is taken with respect to the pressure value P obtained from the detection unit 2, and is set as an average value PAve. However, the process of inputting the initial acquisition value as past data only for the first time is performed.

  In step S3, accelerator opening information A (%) is acquired from the vehicle information obtained from the vehicle information input unit 3.

  In step S4, the accelerator opening degree information A acquired in step S3 is compared with the previous accelerator opening degree information A (Aold), and the magnitude is determined. The determination is made with a width of W, and the same determination is made when the difference between the two is within W. If YES is determined in step S4, the process proceeds to step S5. If NO is determined, the process proceeds to step S9.

  In step S5, the average value PAve acquired in step S2 is compared with the previous average value (Pold) to determine whether the magnitude is the same. The determination has a width of R, and the same determination is made when the difference between the two is within R. If YES is determined in step S5, the process proceeds to step S6. If NO is determined, the process proceeds to step S7.

  In steps S6 and S7, the consciousness counter e is operated. In step S6, e = e + 1 (increment), and in step S7, the count is maintained.

  In step S8, it is determined whether or not the consciousness counter e has reached a specified value D preset in the ROM of the control unit 1 at regular intervals T.

  If the consciousness counter e> the specified value D at the determination timing, Flag = False, and the driver has shown a certain number of reactions for a certain period T, so that the consciousness level is in the normal range. Then, the process proceeds to step S12.

  The state determined in step S12 is a state in which there is consciousness and a reaction of a certain level or more with respect to a change in the external environment, and is a normal state.

  If the consciousness counter e ≦ the specified value D at the determination timing, Flag = True, it is determined that the driver's reaction frequency during the predetermined period T is small, and the consciousness level is lowered, and the process proceeds to step S13.

  The state determined in step S13 is a state in which the level of consciousness is reduced and a response of a certain level or more is not shown in response to a change in the external environment, and is an abnormal state.

  Regardless of the determination result, in steps S12 and S13, the consciousness counter is initialized (e = 0) after a predetermined period T has elapsed.

  In step S18, the state determination results for the past 10 times are tabulated. The dangerous state determination is converted into 2, the normal state determination is converted into 0, and the other states are converted into 1 and the sum is taken.

  In step S19, if the total for the past 10 times exceeds 5, it is determined that a warning is required. The warning state is not updated unless the judgment result is overturned.

  In step S20, a warning is given to the driver. Note that the type of warning can be changed in accordance with the numerical value of the sum.

  In step S4, NO is determined. In step S9, the results obtained in steps S2 and S3 are compared to determine whether the changes are in the same direction. That is, the pressure value of the seat increases in the direction in which the accelerator opening is opened (depressing the accelerator pedal). Alternatively, the accelerator opening is closed (the foot is released from the accelerator pedal) and the seat pressure value is reduced. Determine whether or not. If YES is determined in step S9, the process proceeds to step S10. If NO is determined, the process proceeds to step S11.

  In step S10, it is determined whether or not the increase in accelerator opening has continued for a certain period of time. In the present embodiment, it is assumed that the flow cycle is 10 milliseconds, and this cycle is repeated 40 times for 40 milliseconds. If YES is determined in step S10, the process proceeds to step S14. If NO is determined, the process proceeds to step S15.

  The state determined in step S14 is a state in which the driver keeps stepping on the accelerator pedal for some reason, and is determined to be a dangerous state and an abnormal state.

  The state determined in step S15 is a normal state that can occur in normal accelerator operation (acceleration / deceleration).

  In step S9, it is determined as NO, and in advanced step S11, it is determined whether or not the accelerator opening is increasing. If YES is determined in step S11, the process proceeds to step S16. If NO is determined, the process proceeds to step S17.

  The state determined in step S16 is a state in which the accelerator is open (opening increase / pressure decrease), and the pedal operation is performed contrary to the movement of the leg (change in leg pressure). Is in a dangerous state.

  The state determined in step S17 is a state where the foot is released from the accelerator (opening reduction / pressure increase), which is a leg extension state.

  Further, the flow of steps S2 to S20 is repeated. A series of flows is performed periodically.

  By configuring as described above, it is possible to provide a driver state detection device that can detect a driver's abnormality at an early stage without any restraint or contact of the driver.

  Further, it is only necessary to provide the seat 200 with the detection unit 2 for detecting the driver, and the number of the detection units 2 can be reduced.

  INDUSTRIAL APPLICABILITY The present invention is applicable to a driver state detection device that detects the state of a driver of a vehicle that drives while sitting.

DESCRIPTION OF SYMBOLS 1 Control part 2 Detection part 3 Vehicle information input part 4 Notification means 100 Driver state detection apparatus 200 Seat 210 Seat surface

Claims (2)

In a driver state detection apparatus comprising: a detection unit that detects a driver's state; and a control unit that determines the state of the driver based on information from the detection unit and vehicle information.
The detection unit detects a change in pressure of the right leg of the seat on which the driver sits, the vehicle information is an operation amount of an accelerator pedal of the vehicle, and the control unit detects a change in pressure of the driver's right leg and the pressure A driver state detection device that determines the state of the driver based on an operation amount of an accelerator pedal. The driver state detection device according to claim 1, wherein the detection unit is provided in front of a right side of a seating surface on which the driver sits.

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