JP4403628B2 - Advance vehicle start notification device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a preceding vehicle start notification device that executes a preceding vehicle start notification (preceding vehicle start warning) when a preceding vehicle stopped ahead of the host vehicle starts.
[0002]
[Prior art]
  Conventionally, when a preceding vehicle that has stopped in front of your vehicle has started,As an apparatus for executing the preceding vehicle start notification, for example,,There is an apparatus described in JP-A-8-115499.
  That is, a distance detection unit that is provided at the foremost part of the vehicle and detects a relative distance from the vehicle (own vehicle) to another vehicle (preceding vehicle) positioned in front of the vehicle (previous vehicle) every predetermined time; A traveling state detection unit that is provided in the traveling system and detects a traveling state and a stopped state, determines whether or not the relative distance detected by the distance detection unit has changed in time, and This is a device configured to determine that the preceding vehicle has started and to output an alarm (preceding vehicle start notification) when the inter-vehicle distance increases.
[0003]
  According to this conventional device, when the preceding vehicle starts,While there is an advantage that it is possible to notify the vehicle occupant (driver) of that fact, on the other hand, a place where the start warning of the preceding vehicle is unnecessary (for example,,(In the vicinity of intersections, immediately before the stop line, in parking lots, in gas stations, etc.),Since the above notification is always executed, there is a problem that an annoyance may occur in some cases.
[0004]
[Problems to be solved by the invention]
  ThisThe invention of,Preceding vehicle that blinks when parking(Front obstacle)The hazard lampofAn object of the present invention is to provide a preceding vehicle start notification device that can prevent warning output when lighting is detected.
[0005]
  This invention,Also,Opening the fuel lid that is opened when refuelingCondition detectedSometimes,An object of the present invention is to provide a preceding vehicle start notification device that can prevent alarm output.
[0006]
[Means for Solving the Problems]
  The preceding vehicle start notification device according to the present invention detects a distance from the front obstacle by transmitting a detection wave in front of the host vehicle and receiving a reflected wave from the front obstacle of the detection wave. When the distance increasing rate with the front obstacle during the stop determination by the means, the stop determination means for determining that both the vehicle and the obstacle are stopped, and the stop determination by the stop determination means is greater than a predetermined value, Alarm means for outputting an alarm, and hazard detection means for detecting lighting of a hazard lamp of a preceding vehicle that is a front obstacle,
At the time of detecting the lighting of the hazard lamp of the preceding vehicle, there is provided an alarm prohibiting means for prohibiting the alarm means from outputting an alarm.
[0007]
  According to the above configuration,The distance detection means described above transmits a detection wave (see ultrasonic wave, millimeter wave, laser radar, etc.) in front of the vehicle and receives a reflected wave from an obstacle ahead (see the preceding vehicle) of the detection wave. Thus, the distance between the front obstacle and the own vehicle is detected, the stop determination means described above determines that both the own vehicle and the front obstacle are stopped, and the alarm means is determined by the stop determination means. Outputs an alarm when the rate of increase in distance to the obstacle ahead is greater than the specified value during stop judgmentTo do. Moreover,Hazard detection means,Detection of the hazard lamp of the preceding vehicle is detected and the warning prohibition means is the hazard of the preceding vehicleLamp lightingUpon detectionOf the above alarm meansSince the output of the warning is prohibited, when the preceding vehicle is going to park with the hazard lamp lit, unnecessary output of the preceding vehicle start warning can be prevented.
[0008]
  The preceding vehicle start notification device according to the present invention also detects a distance from the front obstacle by transmitting a detection wave in front of the host vehicle and receiving a reflected wave from the front obstacle of the detection wave. The distance increase rate between the distance detection means, the stop determination means for determining that the host vehicle and the obstacle are both stopped, and the front obstacle during the stop determination by the stop determination means is greater than a predetermined value. An alarm means for outputting an alarm and a lid open state detecting means for detecting an open state of the fuel lid of the own vehicle, and an alarm prohibition for prohibiting an alarm output of the alarm means when detecting the open state of the fuel lid Means are provided.
[0009]
  According to the above configuration, the above-described distance detection means transmits a detection wave (see ultrasonic waves, millimeter waves, laser radar, etc.) in front of the host vehicle, and from the obstacle ahead of the detection wave (see the preceding vehicle). By receiving the reflected wave, the distance between the front obstacle and the own vehicle is detected, and the stop determination means described above determines that both the own vehicle and the front obstacle are stopped, and alarm means. Outputs a warning when the rate of increase in distance to the front obstacle becomes greater than a predetermined value during the stop determination by the stop determination means. Moreover,The lid open state detection means,Detecting the open state of the vehicle's fuel lid,,Opening the fuel lidCondition detectionSometimesOf the above alarm meansSince the alarm output is prohibited, it is possible to prevent an unnecessary preceding vehicle start alarm from being output when refueling the vehicle's fuel tank.
[0010]
【Example】
  An embodiment of the present invention will be described in detail with reference to the drawings.
  The drawing shows a preceding vehicle start notification device, and this preceding vehicle start notification device is,In the own vehicle A in FIG. 1 (hereinafter simply referred to as own vehicle), an ultrasonic sensor 2 is embedded in the front bumper 1.,As shown in FIG.,It is configured to detect a distance R between the own vehicle A and a preceding vehicle B in front of the own vehicle or another object (a front obstacle).
[0011]
  That is, the ultrasonic sensor 2 is,A distance between the preceding vehicle B and the own vehicle A by transmitting an ultrasonic wave as a detection wave in front of the own vehicle A and receiving a reflected wave from a front obstacle including the preceding vehicle B of the ultrasonic wave. R is detected.
[0012]
  FIG. 3 shows a control circuit block diagram of the preceding vehicle start notification device. The CPU 10 as the control means includes an ultrasonic sensor 2, a vehicle speed sensor 3, a parking brake switch 4, a foot brake switch 5, and a gear position switch. Such a shift position switch 6, a fuel lid detection switch 7 for detecting the open / close state of the fuel lid, a GPS sensor 8, a CD-ROM 9 that stores road map information as data, a road-to-vehicle transmitter / receiver 11 as road-to-vehicle communication means, and between vehicles Based on various signal inputs from the vehicle-to-vehicle transceiver 12 and the power switch 13 as communication means, the ultrasonic sensor 2 and the road-to-vehicle distance according to the program stored in the ROM 14SendingThe receiver 11, the inter-vehicle transmitter / receiver 12, and the buzzer 15 as an example of an alarm (alarm) are driven and controlled, and a RAM (storage means) 16 stores necessary data and the like.
[0013]
  Here, the GPS sensor 8 described above is,It is a current position detection unit that receives a GPS signal from the GPS satellite 17 and detects the current position of the vehicle A.
  The road-to-vehicle transceiver 11 described above is,This is a receiving means for receiving information from the information transmitting means 18 using FM multiplex broadcasting, radio wave beacons, and optical beacons of the road traffic information system provided on the road side. The GPS sensor 8 and the road-to-vehicle transceiver 11 may be used alternatively.
[0014]
  Furthermore, the inter-vehicle transceiver 12 described above is,Hazard detection means for performing transmission / reception (communication) between the vehicle of the preceding vehicle B and the host vehicle A and detecting lighting of the hazard lamp of the preceding vehicle B.
  In addition, the CPU 10 described above includes own vehicle speed detecting means for detecting the own vehicle speed V based on an input from the vehicle speed sensor 3 (see the first step S1 in the flowchart shown in FIG. 4),
  Distance detecting means for detecting a distance R between the own vehicle A and a preceding vehicle B as a front obstacle using the ultrasonic sensor 2 (see the third step S3 of the flowchart shown in FIG. 4);
Stop determination means for determining that the host vehicle A and the preceding vehicle B are both stopped (see the seventh step S7 in the flowchart shown in FIG. 4);
This stop determination means(S7)Warning means for outputting a warning when the rate of increase in distance with the preceding vehicle B becomes larger than a predetermined value during the stop determination by (see the ninth step Q9 of the subroutine shown in FIG. 9);
Environment determination means for determining the environment of the current position of the vehicle A (see the first step Q1 of the subroutine shown in FIG. 9);
This environment judgment means(Q1)When the vehicle A is determined to be in a specific location based on the output of the above, it also serves as an alarm prohibiting means for prohibiting the output of the above-described alarm (see the tenth step Q10 of the subroutine shown in FIG. 9).
[0015]
  The environment determination means (see the first step Q1) is based on both the detection result of the GPS sensor 8 and the stored contents of the CD-ROM 9 as the road map information storage means storing the road map information. The environment of the current position of the host vehicle A is determined based on the reception result of the road-to-vehicle transmitter / receiver 11 that determines the environment of the current position or receives information from the information transmission means 18.
[0016]
  The operation of the preceding vehicle start notification device configured as described above will be described in detail below with reference to the flowchart shown in FIG.
[0017]
  In the first step S <b> 1, the CPU 10 measures the host vehicle speed V based on the input from the vehicle speed sensor 3.
  Next, in the second step S2, the CPU 10 determines whether or not a predetermined timing, for example, 100 msec timing, and returns to the first step S1 when determining NO, while moving to the next third step S3 when determining YES.
[0018]
  In the third step S <b> 3, the CPU 10 measures the inter-vehicle distance R using the ultrasonic sensor 2. This inter-vehicle distance R can be obtained by the following [Equation 1].
  [Equation 1]
      R = Va × t ÷ 2
          However, Va is the speed of sound (340 m / sec)
                t transmits an ultrasonic wave, which is the preceding vehicle B or other object
                The time required to receive the reflected wave after being reflected at the unit, in seconds
[0019]
  Next, in a fourth step S4, the CPU 10 executes a filtering process of the inter-vehicle distance R for the purpose of eliminating errors and smoothing.
[0020]
  Next, in the fifth step S5, the CPU 10 calculates the relative speed Vb based on the following [Equation 2].
  [Equation 2]
      Vb = (Rn-1-Rn) / [Delta] t [m / s]
            However, Rn-1 is the inter-vehicle distance measured last time.
                  Rn is the inter-vehicle distance measured this time
                  Δt is 100 msec as an example of the predetermined timing
[0021]
  Next, in a sixth step S6, the CPU 10 executes a filtering process of the relative speed Vb and smoothes it for the purpose of eliminating errors and the like.
[0022]
  Next, in a seventh step S7, the CPU 10 determines whether or not both the own vehicle A and the preceding vehicle B have stopped based on the own vehicle speed V and the smoothed relative speed Vb. When V = 0 and Vb = 0, both the own vehicle A and the preceding vehicle B are stopped, so a YES determination is made. Otherwise, a NO determination is made.
  If YES is determined in the seventh step S7, the process proceeds to the next eighth step S8, and if NO is determined, the process returns to the first step S1.
[0023]
  8th step aboveS8In (confirming means), the CPU 10 determines whether or not the stop of the preceding vehicle B is recognized for a predetermined time, for example, 1 second.
  In this case, as shown in FIG.,Sample timings n, n-1, n-2, n-3, n-4 (where n is the current sample timing, n-1 is the previous sample timing, and n-2 is the previous sample timing) , N-3 is a predetermined area of the RAM 16, and the inter-vehicle distances Rn, Rn-1, Rn-2, Rn-3, and Rn-4 corresponding to the three previous sample timings and the n-4 is the fourth previous sample timing). And the average value Rs of the inter-vehicle distance R is obtained according to the detection situation examples a and b.
[0024]
  In the case of detection status example a in FIG.,That is, when the preceding vehicle detection and the preceding vehicle non-detection are included, the average value Rs is obtained by the following [Equation 3] in order to exclude the preceding vehicle non-detection data.
  [Equation 3]
      Rs = (Rn + Rn-1 + Rn-2 + Rn-3) / 4
[0025]
  In the case of detection status example b in FIG.,That is, when the minimum value and the maximum value of the preceding vehicle detection are included, the average value Rs is obtained by the following [Equation 4] in order to exclude these minimum and maximum values.
  [Equation 4]
      Rs = (Rn-1 + Rn-2 + Rn-3) / 3
[0026]
  Next, the inter-vehicle distance Rn−i (where 0 or 1, 2, 3 is substituted for i) and the inter-vehicle distance average value Rs used in calculating the inter-vehicle distance average value Rs with the preceding vehicle B. The absolute value Ra of the difference is calculated by the following [Equation 5].
  [Equation 5]
      Ra = | Rs−Rn−i |
[0027]
  next,The absolute value Ra described above is an allowable value ΔR for stop determination (for example,,It is determined whether ΔR = 5 cm) or less, that is, whether Ra <ΔR, and it is determined that the preceding vehicle B has stopped when Ra <ΔR. The above is the processing content of the eighth step S8. When YES is determined, the process proceeds to the next ninth step S9, and when NO is determined, the process returns.
[0028]
  In the ninth step S9 described above, the CPU 10 drives the buzzer 15 and informs the occupant that the stop of the preceding vehicle B is recognized only for the first time when the stop of the preceding vehicle B is recognized.,Initialization of acceleration motion detection count Y) described later is executed.
[0029]
  The buzzer 15 drive described above is a confirmation means (eighth step) for confirming the stop of the preceding vehicle B.S86) in this embodiment, as shown in FIG.,In the above notification, the buzzer 15 outputs one notification sound. In this step S9, it is possible to execute only initialization of various parameters so as not to output a notification sound.
[0030]
  Next, in the tenth step S10 (preceding vehicle start detection means), the CPU 10 verifies and determines the moving distance of the preceding vehicle B. That is, when the preceding vehicle B starts, the change value (increase rate) of the inter-vehicle distance R between the own vehicle A and the preceding vehicle B is not less than the creep running characteristic corresponding to the acceleration 0.03G shown in FIG. It is verified and determined whether or not it is within a predetermined range (see the hatched portion in FIG. 7) between the sudden acceleration characteristics corresponding to 3G.
[0031]
  In FIG. 7, the horizontal axis represents time, the vertical axis represents the inter-vehicle distance R, and shows the preceding vehicle travel distance from the preceding vehicle start point. When the preceding vehicle B starts,,In the region between the acceleration 0.03G and the acceleration 0.3G in FIG.
[0032]
  in short,In the tenth step S10 described above,It is determined whether or not the moving distance of the preceding vehicle B is within the hatching in FIG. 7, and when the determination is NO, the process returns, while when the determination is YES, the process proceeds to the next eleventh step S11.
[0033]
  In this eleventh step S11 (counting means), the CPU 10 counts up the acceleration motion detection count Y. Next, in the twelfth step S12 (comparison means), the CPU 10 compares the current number of detections Y with the number of times X of the preceding vehicle start recognition, and proceeds to the next thirteenth step S13 only when Y> X.
[0034]
  That is,Since it is impossible to accurately recognize the start of the preceding vehicle B if the current number of detections Y is only one.,Detection and measurement are executed until a predetermined number of times X is reached.
  In addition, as shown in FIG. 8, the measurement count X (predetermined value) of the preceding vehicle start recognition is varied corresponding to the inter-vehicle distance R between the own vehicle A and the preceding vehicle B (in other words, the preceding vehicle stop distance). .
[0035]
  In this example,When the inter-vehicle distance R is up to 4 m, the measurement count X is 5 times, when the inter-vehicle distance R is 4 to 4.5 m, the measurement count X is 4 times, and when the inter-vehicle distance R is 4.5 m or more, the measurement count Although X is set to 3 times, it is not limited to these numerical values.
[0036]
  In other words, when the inter-vehicle distance R between the host vehicle A and the preceding vehicle B stopped in front thereof is short, a sufficient number of measurements can be secured even if the preceding vehicle B starts, so start detection accuracy can be improved. In order to improve the number of times of measurement X, conversely, when the inter-vehicle distance R between the host vehicle A and the preceding vehicle B stopped in front of it is long, the number of times of measurement is sufficient when the preceding vehicle B starts. Therefore, the number of times of measurement X for reliably detecting whether or not the vehicle has started is decreased.
[0037]
  Thus, if it is determined in the twelfth step S12 that Y> X (YES determination), the process proceeds to the next thirteenth step S13.
  In the thirteenth step S13, the CPU 10 executes alarm control. Details of the alarm control will be described in detail below with reference to a subroutine shown in FIG.
[0038]
  In the first step Q1 (environment determination means), the CPU 10 inputs the current position data from the GPS sensor 8 and the road map data from the CD-ROM 9, and detects and determines the environment of the current position of the vehicle A. Alternatively, the received data from the road-to-vehicle transceiver 11 is input to detect and determine the environment of the current position of the vehicle A.
[0039]
  Next, in the second step Q2, the CPU 10 reads an ON / OFF output signal of the fuel lid detection switch 7.
  Next, in the third step Q3, the CPU 10 determines whether or not the vehicle A is in the vicinity of the intersection or in the intersection (specific location). When YES is determined, the process proceeds to the tenth step Q10. 4 The process proceeds to Q4.
[0040]
  In this fourth step Q4, the CPU 10 determines whether or not the vehicle A is in the vicinity of a straight line (a specific place) of the stop line. When YES is determined, the process proceeds to the tenth step Q10. 5 Shift to step Q5.
[0041]
  In this fifth step Q5, the CPU 10 determines whether or not the own vehicle A is in the parking lot (a specific place). When YES is determined, the process proceeds to the tenth step Q10. When NO is determined, the next sixth step Q6 is determined. Migrate to
[0042]
  In this sixth step Q6, the CPU 10 determines whether or not the own vehicle A is in the gas station (a specific place). When YES is determined, the process proceeds to the tenth step Q10. When NO is determined, the next seventh step is determined. Move to Q7.
[0043]
  In this seventh step Q7, the CPU 10 determines whether or not the hazard lamp of the preceding vehicle B is blinking based on the received signal input from the inter-vehicle transmitter / receiver 12, and proceeds to the tenth step Q10 at the time of YES determination, while NO At the time of determination, the process proceeds to the next eighth step Q8.
[0044]
  In this eighth step Q8, the CPU 10 determines whether or not the fuel lid of the own vehicle A is open based on the read data in the previous second step Q2, and when determining YES, the CPU 10 proceeds to the tenth step Q10, When NO is determined, the process proceeds to the next ninth step Q9.
[0045]
  In this ninth step S9 (warning means), the CPU 10 drives the buzzer 15 to notify the occupant that the preceding vehicle B has started. The start notification of the preceding vehicle B, that is, the alarm output, is executed by detecting the previous start state and starting the notification (see FIG. 6) different from the notification mode. In this embodiment, as shown in FIG. The buzzer 15 outputs two intermittent notification sounds.
[0046]
  On the other hand, in the above-mentioned tenth step Q10 (alarm prohibition means), the CPU 10 determines whether the specific location (within the vicinity of the intersection, immediately before the stop line, in the parking lot, in the gas station) or the own vehicle A or the preceding vehicle B by the environmental determination. In response to a specific condition (the fuel lid of the own vehicle A is open and the hazard lamp of the preceding vehicle B is blinking), the alarm output is prohibited. That is,The buzzer 15 is not operated even when the preceding vehicle B starts.
[0047]
  In short,The preceding vehicle start notification device of the above embodiment transmits a detection wave (see ultrasonic waves) in front of the own vehicle A, and receives a reflected wave from an obstacle ahead of the detection wave (see preceding vehicle B). The distance detecting means for detecting the distance R to the front obstacle (see the ultrasonic sensor 2 and step S3) and the stop for determining that the host vehicle A and the obstacle (see the preceding vehicle B) are both stopped. When the rate of increase in distance between the determination means (see step S7) and the front obstacle (see preceding vehicle B) becomes larger than a predetermined value (see 0.03G in FIG. 7) during the stop determination by the stop determination means. Warning means for outputting a warning (see step Q9), environment judgment means for judging the environment of the current position of the vehicle A (see step Q1), and the vehicle A is specified based on the output of the environment judgment means. Alarm prohibition that prohibits the output of the above alarm when it is determined to be in place Is obtained by a stage (see step Q10).
[0048]
  With this configuration, the above-described distance detecting means (ultrasonic sensor and step S3) transmits a detection wave (see ultrasonic wave) in front of the host vehicle A and receives a reflected wave from the preceding vehicle B of the detection wave. Thus, the distance R between the preceding vehicle B and the own vehicle A is detected, and the stop determination means (see step S7) determines that both the own vehicle A and the preceding vehicle B are stopped. The warning means (see step Q9) outputs a warning when the distance increase rate with the preceding vehicle B becomes larger than a predetermined value during the stop determination by the stop determination means, and the above-described environment determination means (see step Q1). ) Determines the environment of the current position of the vehicle A, but the above-described alarm prohibition means (see step Q10) determines that the vehicle A is in a specific place based on the output of the environment determination means. The output of the alarm is prohibited.
[0049]
  Therefore, when the own vehicle A is in a specific place, even if the preceding vehicle B starts, warning output is prohibited so that warning output can be prevented in places where a start warning is unnecessary.
[0050]
  Further, road map information storage means (CD-ROM 9) that stores the detection result of the current position detection means (see GPS sensor 8) for detecting the current position of the vehicle (see own vehicle A) and road map information (see map data). The vehicle A is in the vicinity of the intersection based on the reception result of the receiving means (see the road-to-vehicle transceiver 11) that receives the information from the information transmitting means 18 provided on the road side When it is determined that it is within the range, the alarm output is prohibited.
  As a result, when the own vehicle A is in the vicinity of the intersection or in the intersection (in a specific case), it is possible to prevent an unnecessary preceding vehicle start warning from being output.
[0051]
  Further, a road map information storage means (CD-ROM 9) that stores the detection result of the current position detection means (see the GPS sensor 8) for detecting the current position of the vehicle (see the own vehicle A) and the road map information (see map data). Based on the stored content of the reference) or based on the reception result of the receiving means (see the road-to-vehicle transmitter / receiver 11) that receives information from the information transmitting means 18 provided on the road side, When it is determined that the position is in the vicinity immediately before, the output of an alarm is prohibited.
  As a result, an unnecessary preceding vehicle start warning can be prevented from being output when the vehicle A is in the vicinity of a straight line (specific location) of the stop line.
[0052]
  In addition, road map information storage means (CD-) that stores the detection result of the current position detection means (see GPS sensor 8) for detecting the current position of the vehicle (see own vehicle A) and road map information (see map data). The vehicle A is parked based on the stored contents of the ROM 9) or based on the reception result of the receiving means (see the road-to-vehicle transceiver 11) that receives information from the information transmitting means 18 provided on the road side. When it is determined that the vehicle is in the field or at a gas station, alarm output is prohibited.
  As a result, when the own vehicle A is in a parking lot or a gas station (in a specific case), it is possible to prevent an unnecessary preceding vehicle start warning from being output.
[0053]
  Also, hazard detection means (see inter-vehicle transmitter / receiver 12) for detecting the lighting of the hazard lamp of the preceding vehicle B is provided, and when the hazard of the preceding vehicle B is detected, the above-described alarm prohibiting means (see step Q10) prohibits the output of the alarm. Is.
  As described above, the hazard detection means (see the inter-vehicle transceiver 12) detects the lighting of the hazard lamp of the preceding vehicle B, and the warning prohibiting means (see step Q10) prohibits the output of the alarm when the hazard of the preceding vehicle B is detected. When the preceding vehicle B is about to park by turning on the hazard lamp, unnecessary output of the preceding vehicle start warning can be prevented.
[0054]
  Further, a lid open state detecting means (refer to the fuel lid detection switch 7) for detecting the open state of the fuel lid of the host vehicle A is provided, and the alarm prohibiting means (refer to step Q10) prohibits the output of the alarm when the fuel lid is opened. Is.
[0055]
  Thus, the lid open state detecting means (see the fuel lid detection switch 7) detects the open state of the fuel lid of the vehicle A, and the alarm prohibiting means (see step Q10) prohibits the output of the alarm when the fuel lid is opened. When refueling the fuel tank of the own vehicle A, it is possible to prevent an unnecessary preceding vehicle start warning from being output.
[0056]
  FIG. 11 shows another embodiment of the preceding vehicle start notification device. A processing step Q11 is additionally set between the eighth step Q8 and the ninth step Q9 in the flowchart shown in FIG. 9, and the eleventh step Q11. Thus, it is determined whether or not the current position of the vehicle A is in the vicinity of a railroad crossing without a stop line. When YES is determined, the process proceeds to the 10th step Q10, and when NO is determined, the process proceeds to the 9th step Q9. . Also in this embodiment, the circuit device of FIG. 3 and the main routine of FIG. 4 are used.
[0057]
  Thus, road map information storage means (CD-) that stores the detection result of the current position detection means (see GPS sensor 8) for detecting the current position of the vehicle (see own vehicle A) and road map information (see map data). The own vehicle A stops based on the stored contents of the ROM 9) or based on the reception result of the receiving means (see the road-to-vehicle transceiver 11) that receives information from the information transmitting means 18 provided on the road side. If it is determined that the alarm output is prohibited when it is determined that the vehicle is in the vicinity of a railroad crossing without a line, the alarm output by the buzzer 15 can be prevented when the preceding vehicle start alarm is unnecessary as in the previous embodiment. .
[0058]
  In this embodiment, since the other operations and effects are the same as in the previous embodiment, the same reference numerals are given to the same parts in FIG.AttachedDetailed description thereof will be omitted.
[0059]
  In the correspondence between the configuration of the present invention and the above-described embodiment,
  The detection wave of the present invention corresponds to the ultrasonic wave of the embodiment,
  Similarly,
  The front obstacle corresponds to the preceding vehicle B,
  The distance detection means corresponds to the third step S3 controlled by the ultrasonic sensor 2 and the CPU 10,
  The stop determination means corresponds to the seventh step S7,
  The alarm means corresponds to the ninth step Q9.,
  The alarm prohibition means corresponds to the tenth step Q10.,
  The hazard detection means corresponds to the inter-vehicle transceiver 12,
  The lid open state detection means corresponds to the fuel lid detection switch 7,
  The present invention is not limited to the configuration of the above-described embodiment.
[0060]
  For example, other detection waves such as millimeter waves and leather radars may be used as the detection waves instead of the ultrasonic waves. Each step under the control of the CPU 10 constitutes each means corresponding to the processing.
[0061]
【The invention's effect】
  According to the first aspect of the present invention, the hazard detecting means detects lighting of the hazard lamp of the preceding vehicle, and the alarm prohibiting means prohibits the alarm means from outputting an alarm when detecting the lighting of the hazard lamp of the preceding vehicle. Therefore, when the preceding vehicle is about to park by turning on the hazard lamp, there is an effect that it is possible to prevent unnecessary output of the preceding vehicle start warning.
[0062]
  According to a second aspect of the present invention, the lid open state detecting means detects the fuel lid open state of the host vehicle, and the alarm prohibiting means outputs an alarm output from the alarm means when the fuel lid open state is detected. Since the prohibition is prohibited, it is possible to prevent an unnecessary preceding vehicle start warning from being output when refueling the fuel tank of the own vehicle.
[Brief description of the drawings]
FIG. 1 is a front view of a host vehicle equipped with a preceding vehicle start notification device of the present invention.
FIG. 2 is an explanatory diagram showing a distance between the own vehicle and a preceding vehicle.
FIG. 3 is a control circuit block diagram of a preceding vehicle start notification device.
FIG. 4 is a flowchart showing stop and start determination control.
FIG. 5 is an explanatory diagram showing sampling of the inter-vehicle distance.
FIG. 6 is an explanatory diagram of a notification sound when starting detection of a preceding vehicle start.
[Fig. 7] Acceleration motion of the preceding vehicleTheFIG.
FIG. 8 is an explanatory diagram showing the setting of the number of measurements according to the distance between the vehicles.
FIG. 9 is a flowchart showing a preceding vehicle start warning and warning output prohibition control.
FIG. 10 is an explanatory diagram of a notification sound when the preceding vehicle starts.
FIG. 11 is a flowchart showing another embodiment of the alarm output prohibition control.
[Explanation of symbols]
  A ... Own car
  B ... preceding car
  2 ... Ultrasonic sensor (distance detection means)
  7: Lid open state detection means (fuel lid detection switch)
  12 ... Inter-vehicle transceiver (hazard detection means)
  S3: Distance detection means
  S7 ... Stop determination handSteps
  Q9 ... Alarm means
  Q10 ... Alarm prohibition means

Claims (2)

A distance detection means for detecting a distance from the front obstacle by transmitting a detection wave in front of the host vehicle and receiving a reflected wave from the front obstacle of the detection wave;
Stop determining means for determining that the vehicle and the obstacle are both stopped;
Alarm means for outputting an alarm when the rate of increase in distance to the front obstacle is greater than a predetermined value during stop determination by the stop determination means;
A hazard detection means for detecting lighting of a hazard lamp of a preceding vehicle that is a front obstacle, and
A preceding vehicle start notification device provided with an alarm prohibiting means for prohibiting the output of the alarm of the alarm means when detecting the lighting of the hazard lamp of the preceding vehicle. A distance detection means for detecting a distance from the front obstacle by transmitting a detection wave in front of the host vehicle and receiving a reflected wave from the front obstacle of the detection wave;
Stop determining means for determining that the vehicle and the obstacle are both stopped;
Alarm means for outputting an alarm when the rate of increase in distance to the front obstacle is greater than a predetermined value during stop determination by the stop determination means;
A lid open state detecting means for detecting an open state of the fuel lid of the own vehicle; and
A preceding vehicle start notification device comprising alarm prohibiting means for prohibiting the alarm means from outputting an alarm when the fuel lid is opened.

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