JP2018103647A - Obstacle notification device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid that an alarm becomes excessive by switching acoustic pressure to high pressure and low pressure when an own vehicle approaches and separates from an obstacle even if an alarm pattern is set to the same alarm pattern when switching the alarm pattern according to a distance of the obstacle.SOLUTION: When there is no change in an alarm pattern which is switched by pattern changeover means 4, it is determined that an own vehicle and an obstacle approach each other or separate from each other by acoustic pressure changeover means 5 by deriving a difference average ΔAv of a measurement value by distance measurement means 2 at a current measurement time by the distance measurement means 2, and a measurement time two times ago which is held in a memory 6. When the own vehicle approaches the obstacle, acoustic pressure is switched to high pressure in order to raise the acoustic pressure at a pronouncing pattern of an alarm buzzer 3 which is switched by the pattern changeover means 4, and when the own vehicle separates from the obstacle, the acoustic pressure is switched to low pressure in order to lower the acoustic pressure at the pronouncing pattern of the alarm buzzer 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle obstacle notification device that detects obstacles around a host vehicle and varies the sound generation state of an alarm sound by an alarm sound generating means according to the distance from the obstacle.

  2. Description of the Related Art Conventionally, a vehicle obstacle notification device has been proposed in which obstacles around a host vehicle are detected by a sensor, and an alarm pattern of an alarm sound by an alarm sound generating means is switched according to the distance from the detected obstacle. (Patent Document 1). In this vehicle obstacle notification device, for example, when there is an obstacle approaching the host vehicle, the alarm buzzer is driven to alert the driver, and the driver is given a sense of the distance to the obstacle. The alarm pattern such as the buzzer time interval is changed to notify the user.

JP 2004-345495 A (see paragraph 0015)

  However, in the case of the vehicle obstacle notification device described above, for example, in the case of passing through a narrow alley, the distance from the obstacles such as walls on both sides that are obstacles is narrow while passing through the alley, The alarm buzzer will continue to sound at the same sound pressure in a pattern to call attention until it has passed the alley and moved away from the predetermined distance after approaching the alley at a predetermined distance, resulting in excessive warning and annoying for the driver. There is a problem of giving.

  In the present invention, when switching the alarm pattern according to the distance of the obstacle, the sound pressure is switched between large and small when the vehicle approaches the obstacle and when the vehicle moves away even if the same alarm pattern is set. The purpose is to avoid excessive alarms.

  In order to achieve the above-described object, the vehicle obstacle notification device according to the present invention detects an obstacle around the own vehicle, and indicates the sound generation state of the alarm sound by the alarm sound generating means according to the distance from the obstacle. In a variable vehicle obstacle alarm device, distance measuring means for measuring a distance to an obstacle around the host vehicle at predetermined measurement times, and the warning sound generating means according to a distance measurement value by the distance measuring means The pattern switching means for switching the alarm pattern, and the current measured value by the distance measuring means and the past measured value at least several times before the measurement time are compared, and when the own vehicle is approaching the obstacle, the alarm The sound pressure in the alarm pattern switched by the sound generating means is switched greatly, and the sound pressure in the alarm pattern switched by the alarm sound generating means is switched small when moving away. It is characterized in that it comprises a sound pressure switching unit.

  According to the present invention, the alarm pattern of the alarm sound generating means is switched by the pattern switching means according to the measured value of the distance between the host vehicle and the obstacle by the distance measuring means, and at least several times the current measured value by the distance measuring means. As a result of comparison with the past measured value before the measurement time, the sound pressure switching means increases the sound pressure in the alarm pattern switched by the alarm sound generating means when the host vehicle is approaching the obstacle. Since the sound pressure is switched to decrease when moving away, even if the distance between the vehicle and the obstacle does not lead to the switching of the alarm pattern, the obstacle is approached or obstructed in the same alarm pattern. The sound pressure changes depending on the distance from the vehicle, and the alarm buzzer does not continue to sound at the same sound pressure as in the past. The give annoyance to the driver by preventing Rukoto can be prevented.

1 is a block diagram of an embodiment of a vehicle obstacle notification device according to the present invention. It is operation | movement explanatory drawing of one Embodiment. It is a flowchart for operation | movement description of one Embodiment.

  An embodiment of a vehicle obstacle notification device according to the present invention will be described in detail with reference to FIGS. 1 to 3.

  As shown in FIG. 1, the vehicle obstacle notification device 1 includes a distance measuring means 2, an alarm buzzer 3 that is an alarm sound generating means, a pattern switching means 4, a sound pressure switching means 5, and a memory 6. Prepare.

  The distance measuring means 2 is composed of a distance measuring sensor 2a such as an ultrasonic sensor, a laser radar, a millimeter wave laser, etc., and a distance to an obstacle around the host vehicle is determined by the sensor 2a for a predetermined measurement time Δt (for example, 100 ms). ), The measured value at each measurement time and the alarm pattern switched by the pattern switching means 4 are stored in the memory 6.

  The pattern switching means 4 switches the alarm pattern of the alarm buzzer 3 according to the measured value of the distance between the host vehicle and the obstacle measured by the distance measuring means 2. Specifically, as shown in FIG. 2A, if the measured value Dt at the current measurement time t is smaller than 45 cm which is the first threshold value D1, the alarm level by the alarm buzzer 3 becomes “alarm”. The pattern switching means 4 performs switching setting so that a continuous buzzer sound “Pipipi ...” of pattern A is generated as an alarm pattern at that time.

  Also, if the measured value Dt at the current measurement time t is equal to or greater than the first threshold value D1 (45 cm) and smaller than the second threshold value of 60 cm, the alarm level by the alarm buzzer 3 becomes “warning”. The pattern switching means 4 performs switching control so that an intermittent buzzer sound of “Beep” of the pattern B is generated as an alarm pattern at that time, and the measured value Dt at the current measurement time t is further controlled. Is greater than or equal to the second threshold value D2 (60 cm) and smaller than the third threshold value of 100 cm, the alarm level by the alarm buzzer 3 is set to “information provision”, and the pattern as the alarm pattern at that time Switching setting by the pattern switching means 4 is performed so that a discrete buzzer sound of “Pi ……… pi ……… pi ………” is generated.

  By the way, as shown in FIG. 2 (b), the sound pressure switching means 5 is not close to the vehicle and the obstacle when the alarm pattern set by the pattern switching means 4 is not changed. The sound pressure of the alarm buzzer 3 is switched to low (for example, 40), middle (for example, 50), and high (for example, 60), respectively, depending on whether there is no change or approaching.

  Specifically, as shown in the flowchart of FIG. 3, the distance from the vehicle to the obstacle is measured by the sensor 2a of the distance measuring means 2 (step S1), and the alarm pattern of the alarm buzzer 3 corresponding to the measured value Is switched by the pattern switching means 4 (step S2), and then the alarm level such as “alarm”, “warning”, “information provision”, etc. in the alarm pattern by the pattern switching means 4 at the current measurement time t and once The alarm level at the previous measurement time t−1 is compared, and it is determined whether the alarm level has been lowered from “warning” to “information provision” or has been raised from “warning” to “warning” (step) S3).

  At this time, if the alarm level is lowered, the sound pressure switching means 5 switches the sound pressure of the alarm buzzer 3 to low (40 in FIG. 2B) (step S4), and if the alarm level is raised, the sound is switched. The sound pressure of the alarm buzzer 3 is switched and set to high (60 in FIG. 2B) by the pressure switching means 5 (step S5), and the alarm buzzer 3 is operated with the set sound pressure (step S6).

  Furthermore, if the alarm level is the same without changing by the sound pressure switching means 5, it is determined whether or not the measured value of the distance from the current time to the previous two times is in the memory 6 (step S7). If NO is determined, the process returns to the above-described step S5. If the determination result is YES, the measured values Dt and Dt-1 of the distance between the current measurement time t and the measurement times t-1 and t-2 up to two times before are determined. , Dt−2 is derived (step S8), and the difference average ΔAv is determined to be negative or positive (step S9).

  If the difference average ΔAv is negative as a result of the determination in step S9, the sound pressure in the same warning pattern is high (60 in FIG. 2 (b)) because the approaching degree between the host vehicle and the obstacle is approaching. If the difference average ΔAv is ± 0 without change (step S10), there is no change in the degree of approach between the host vehicle and the obstacle, and the sound pressure in the same alarm pattern is middle (50 in FIG. 2 (b)). (Step S11), if the difference average ΔAv is positive, the sound pressure in the same alarm pattern is low (40 in FIG. 2B), indicating that the degree of approach between the host vehicle and the obstacle is moving away. (Step S12), and then the process proceeds to step S6 to activate the alarm buzzer 3 with the set sound pressure.

  Thus, if there is no change in the alarm pattern switched by the pattern switching means 4, the current measurement time t by the distance measurement means 2, the measurement times t−1 held two times before held in the memory 6, By deriving the average difference ΔAv of the measured values Dt, Dt-1, and Dt-2 at t-2, it is determined by the sound pressure switching means 5 whether the host vehicle and the obstacle are approaching or moving away. If so, it is switched to high to increase the sound pressure in the alarm pattern of the alarm buzzer 3 switched by the pattern switching means 4, and low to decrease the sound pressure in the alarm pattern of the alarm buzzer 3 when moving away. Can be switched to.

  Therefore, according to the above-described embodiment, the sound pressure is switched between large and small (high, low) depending on whether the object approaches or moves away from the obstacle in the same alarm pattern, and the alarm buzzer sounds the same as in the conventional case. It does not continue to ring with pressure, can prevent an excessive warning for the driver, and does not bother the driver.

  The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the spirit of the present invention.

  For example, in the above-described embodiment, the alarm level serving as a reference when the alarm pattern is switched and set by the pattern switching means 4 has been described as the three levels of “alarm”, “warning”, and “information provision”. You may set in four steps or more.

  Further, although the case where the sound pressure for switching the sound pressure by the sound pressure switching means 5 is set to three levels of high, middle, and low has been described, this may be set to two levels or four or more levels.

  In the above-described embodiment, the distance measurement value Dt at the current measurement time t and the difference average ΔAv between the measurement values Dt−1 and Dt−2 at the measurement times t−1 and t−2 up to the previous time. However, it is also possible to derive a difference average up to a predetermined number of times three or more times.

DESCRIPTION OF SYMBOLS 1 ... Obstacle notification apparatus for vehicles 2 ... Ranging means 3 ... Alarm buzzer (alarm sound generating means)
4 ... Pattern switching means 5 ... Sound pressure switching means

Claims (1)

In the vehicle obstacle notification device that detects obstacles around the host vehicle and varies the sound generation state of the warning sound by the warning sound generating means according to the distance from the obstacle,
Ranging means for measuring the distance to obstacles around the vehicle every predetermined measurement time;
Pattern switching means for switching the alarm pattern of the alarm sound generating means according to the distance measured by the distance measuring means;
A warning pattern that is switched by the warning sound generating means when the current measured value by the distance measuring means is compared with a past measured value at least several times before the measurement time and the vehicle is approaching the obstacle. And a sound pressure switching means for switching the sound pressure in the alarm pattern switched by the alarm sound generating means to be small when the sound pressure is switched away.

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