JPH05116622A - Approach alarming device - Google Patents

Abstract

PURPOSE:To prevent collision with a car behind or the like due to careless opening of a door by providing ultrasonic transceivers on the rear part of an automobile so as to measure the danger degree and the dislocation width from the car behind or the like, and for example locking the door on the dangerous side in the dangerous case. CONSTITUTION:Ultrasonic transceivers 3, 4 to detect the distance from the car behind 2 are arranged respectively on the right and left of the rear part of an automobile 1. The respective detected signals of the transceivers 3, 4 are respectively input to a computer 5. The respective control signals of the computer 5 are output to various alarming devices 6, a door lock device 7, a seat belt winding device 8, an automobile take-off device 9, and the like. Respectively at this time by means of the computer 5, the distance between this car and the car behind is detected based on the respective detected signals from the transceivers 3, 4, a danger quantity related to the relative speed between the automobiles is measured based on the distance between the automobiles, and the dislocation width between the automobiles is computed. In case of danger, for example the door on the dangerous side is locked so as to prevent collision with the car behind 2 due to careless opening of the door.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a proximity warning device for an automobile.

[0002]

2. Description of the Related Art Conventionally, when starting a vehicle or opening a door, it has been necessary to visually check the presence or absence of a following vehicle. In addition, there has been a conventional back scanner that detects an obstacle behind and issues an alarm (Actual development: Shokai 6).
No. 2-151163, etc.).

[0003]

However, due to carelessness, the car may start without knowing that the following car will come,
There is a risk of accidents such as opening the door. There are currently no specific measures to prevent the above-mentioned rear-end collision with the following vehicle and to ensure maximum safety.

[0004]

The present invention has been made in view of the above problems, and ultrasonic waves for detecting distances l ₁ and l ₂ to the vehicle 2 approaching from the rear on both sides of the rear of the vehicle 1. The transmitters / receivers 3 and 4 and the computer 5 for receiving the signals of the transmitters / receivers 3 and 4 are provided, and the computer 5 uses the transmitters / receivers 3 and 4 to calculate the distances l ₁ and l ₂ and a means P ₄ for calculating the distances l ₁ and l _2. Relative speed between cars 1 and 2 vf _R /
Means P ₁₁ , P ₂₁ , P for measuring the dangerous quantity X related to f _0
31 , P ₄₀ and means P ₁₃ , P ₁₄ , P ₂₃ , P ₂₄ , P ₃₃ , P ₃₄ , P ₄₁ , for calculating the relative deviation width W between the automobiles 1 and 2.
P ₄₂ and P ₄₃ are provided, and the door lock device 7 on the dangerous side is operated in a dangerous situation.

Further, it is a proximity alarm device which activates the alarm device 6 in case of danger.

Further, it is a proximity warning device which operates the seat belt retractor 8 in case of danger.

[0007]

The dangerous amount X and the deviation width W lock the door on the right side or the left side on the dangerous side at the time of danger and generate an alarm sound. Alternatively, in case of danger, the seat belt retractor 8
To operate.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, ultrasonic wave transmitters / receivers 3 and 4 for detecting distances l ₁ and l ₂ to a vehicle 2 approaching from the rear are respectively provided on the right and left rear portions of a vehicle body of an automobile 1. Provided,
As shown in FIG. 2, the signals of the transmitters / receivers 3 and 4 are input to a computer 5, and the computer 5 is used for various alarm devices 6, a door lock device 7, a seat belt retractor 8, a vehicle starter 9 and the like. Send a signal. In addition, x is automobile 1,2
And y represents the vehicle width (distance between the transceivers 3 and 4).

The transmitters / receivers 3 and 4 transmit ultrasonic waves at regular time intervals and receive reflected waves from the succeeding vehicle 2,
The computer 5 calculates the distances l ₁ and l ₂ between the cars 1 and ₂ from the time differences t ₁ and t ₂ between the transmission and reception, and also calculates the speed of the following car 2 using the Doppler effect.

Next, the flow of the computer 5 will be described with reference to FIGS. As shown in FIG. 3, the vehicle starts at step P ₀ , and at step P ₁ , the speed v ₁ of the vehicle 1 v ₁ = 0.
Detecting a time difference t ₁ of transmission and reception signals of the transceiver 3 is calculated in step P _2, the time difference t ₂ of the transmission and reception signals of the transceiver 4 is calculated in step P _3, the transceiver 3, 4 in Step P ₄ Distances l ₁ (= t ₁ v) and l ₂ (= t ₂ v) with the following car 2 are calculated. Note that v is the propagation velocity of ultrasonic waves. In step P ₅ , the size of the distance l ₁ is judged, and if it is longer than the predetermined value c ₁ (= 40 m), the step P 5
It ends at ₆ .

[0011] The distance l ₁ is is longer or shorter than a predetermined value c ₂ (= 30m) in the step P ₁₀ is determined when less than the predetermined value c _1, long time car 1 in step P ₁₁
Relative speed vf _R / f ₀ of the vehicle is corrected by the turn-around speed of the following vehicle, that is, the dangerous amount

[Equation 2] (However, f ₀ : transmission frequency, f _R : reception frequency, v: ultrasonic wave propagation velocity) is determined, and it is a predetermined value X ₁ (=
9.7 m / s) when smaller than ends in step P _12,
When it is larger than the predetermined value X ₁ (= 9.7 m / s), the process proceeds to step P ₁₃ , where the relative deviation width W between the automobiles 1 and 2 is W.
(= L ₁ ² −l ₂ ² ) is determined.

This will be described with reference to FIG.
Can be represented by x = (l ₂ ² -l ₁ ² -y ² ) / 2y. On the other hand, how much the succeeding car 2 is displaced from the car 1 to the left and right can be expressed by 0 <x ≦ y. Therefore, 0 <(l ₂ ² −l ₁ ² −y ² ) /
From 2y ≦ y, y ² <l ₂ ² −l ₁ ² ≦ 3y ² .
This is the case when the following vehicle passes the right side as shown in FIG. 1, but when the following vehicle passes the left side in the same manner,
The ^{_{-3y 2 ≦ l 2 2 -l 1}} 2 ≦ -y 2. Then, in this embodiment, y = 2 m, 4 <W ≦ 12, −12 ≦
We obtain W ≦ −4. When the shift width W is outside the range from -12 -4, the process proceeds to step P _14, also terminates in step P ₁₅ when outside the range from 12 to 4. The deviation width W is from -12
When in the range of 4, i.e. when the following vehicle passes through the right side, the right side of the door is locked at step P _16, alarm sound exits in step P _17.

When the deviation width W is within the range of 4 to 12, that is, when the following vehicle passes on the left side, the left door is locked in step P ₁₈ , and an alarm sound is emitted in step P ₁₉ .

When the distance l ₁ is smaller than the predetermined value c ₂ (= 30 m), as shown in FIG. 4, it is judged from the point A whether it is larger or smaller than the predetermined value c ₃ (= 20 m) in step P ₂₀ . big time dangerous amount X is determined in the step P _21,
When it is smaller than the predetermined value X ₂ (= 6.9 m / s), the process ends in step P ₂₂ , and when it is larger than X ₂ (= 6.9 m / s), the deviation width W is determined in step P _23. To be judged.

The steps P ₁₄ , P ₁₅ , P ₁₆ , and
The same operations as P ₁₇ , P ₁₈ , and P ₁₉ are performed in steps P ₂₄ , P ₂₅ , and P.
₂₆ , P ₂₇ , P ₂₈ , P ₂₉ , when the following vehicle passes on the right side or the left side, the door on the right side or the left side is locked and an alarm sounds.

Distance l₁Is a predetermined value c₃Less than (= 20m)
Step P₃₀And the predetermined value c _FourFrom (= 10m)
It is determined whether it is large or small.
P P _{twenty one}~ P₂₉The same operation as step P₃₁~ P₃₉Done in
Be done. The comparison value of the dangerous amount X at this time is the predetermined value X.
₃(= 4.2 m / s).

When the distance l ₁ is smaller than the predetermined value c ₄ (= 10 m), the dangerous amount X is judged from the point B at step P ₄₀ as shown in FIG. 5, and the dangerous amount X is the predetermined value X ₃ (= 4). .2 m /
s) and a predetermined value X ₄ (= 0 m / s), the deviation width W is determined in steps P ₄₁ , P ₄₂ and P ₄₃ , and the deviation width W is in the range −12 and −4, −. 4 and 4,4 and the determination whether the range of 12, when out of range ends at step P _44.

That is, the deviation width W when the preceding vehicle passes the right side is y ₂ <l ₂ ² −l ₁ ² ≦ 3y ² , and the deviation width W when the following vehicle passes the left side is −3y. ^{In addition to 2} ≦ l ₂ ² −l ₁ ² ≦ −y ² , there is a possibility that a following vehicle may collide with own vehicle 1, −y ² ≦ l ₂
Consider ² -l ₁ ² ≦ y ^2. And in this embodiment,
When y = 2 m, -4 ≦ W ≦ 4 is obtained.

[0019] When the shift width W is in the range of -12 and -4 are locked right door step P _45, Step P
_{At 46} , an alarm sounds.

When the deviation width W is within the range of 4 and 12, the left door is locked in step P ₄₇ and step P ₄₈
Sounds an alarm.

[0021] When the shift width W is in the range -4 and 4 is determined on-off of the left turn signal or hazard in step P _49, when the off-locked left and right doors at step P _50, step P ₅₁ Sounds an alarm. When on car 1 is locked on the right of the door in step P _52, it is assumed that stops at the left roadside body, warning sound exits in step P _53.

When the dangerous amount X is larger than the predetermined value X ₃ (= 4.2 m / s), the routine proceeds to step P ₆₀ , where the deviation width W is judged at step P ₆₁ , and the deviation width W is -12 and 12. when in range seat belt and take-up (preload) in step P _62, comprising a collision warning sound is emitted in step P _63.

[0023] When the shift width W is outside the range of -2 and 12 ends in step P _64.

In this embodiment, step P₁₃, P_{twenty three},
P₃₃When the deviation width W is −12 ≦ W ≦ −4,
P₁₄, P_{twenty four}, P₃₄When the deviation width W is 4 <W ≦ 12,
I turned it down, but I got off the center line of my car 1
Width W ', that is, step P ₁₃, P_{twenty three}, P₃₃Deviation width
When W ′ is −12 ≦ W ′ ≦ 0, step P₁₄,
P_{twenty four}, P₃₄When the deviation width W ′ is 0 <W ′ ≦ 12,
You may judge each.

As described above, the distances l ₁ and l ₂ between the own vehicle 1 and the succeeding vehicle 2 and the lateral shift width W between the two vehicles
When it is determined that the vehicle is within a certain range, the left, right, left and right doors are locked or the alarm device 6 notifies the danger according to the distance to the following vehicle and the speed of the following vehicle.

[0026]

As described above, according to the present invention, the ultrasonic transmitters / receivers 3, 4 are installed in the rear portion of the automobile to measure the dangerous amount X of the succeeding automobile or the rear object and the deviation width W thereof. However, the dangerous amount X and the deviation width W are used to lock the door on the right side or the left side on the dangerous side at the time of danger and to generate an alarm sound, so that the door is opened carelessly by the following vehicle. It is possible to prevent contact with a following vehicle and a collision accident due to a collision with the vehicle, and to ensure maximum safety. Further, when it is determined that there is a high possibility of collision with the following vehicle, the seat belt is wound (preloaded) and an alarm sound is emitted to notify the danger, so that the safety is high.

[Brief description of drawings]

FIG. 1 is a plan view of an automobile according to an embodiment of the present invention.

FIG. 2 is a block diagram thereof.

FIG. 3 is a flowchart of a computer.

FIG. 4 is a flowchart of a computer.

FIG. 5 is a flowchart of a computer.

[Explanation of symbols]

1 Car 2 Car 3,4 Transceiver 5 Computer 6 Alarm device 7 Door lock device 8 Seat belt retractor l ₁ , l ₂ Distance X Danger amount W Deviation width

Claims (5)

[Claims] 1. An ultrasonic transmitter / receiver for detecting a distance to a car approaching from the rear and a computer for receiving signals from these transmitters / receivers are provided on both sides of a rear part of the car, and the computer determines the distance from the transmitter / receiver. It has means for calculating, a means for measuring a dangerous amount related to the relative speed between the vehicles and a means for calculating the deviation width between the vehicles, and operates the door lock device on the dangerous side in case of danger. Proximity alarm device. 2. An ultrasonic transmitter / receiver for detecting a distance to a car approaching from the rear and a computer for receiving signals from these transmitters / receivers are provided on both sides of a rear part of the car, and the computer is arranged to detect the distance from the transmitter / receiver. A proximity warning device having means for calculating, a means for measuring a dangerous amount related to the relative speed between the vehicles and a means for calculating a deviation width between the vehicles, and for activating the warning device at the time of danger .. 3. An ultrasonic transmitter / receiver for detecting a distance to a car approaching from the rear and a computer for receiving signals from these transmitters / receivers are provided on both sides of a rear part of the car, and the computer determines the distance from the transmitter / receiver. A means for calculating, a means for measuring a dangerous amount related to the relative speed between the vehicles and a means for calculating the deviation width between the vehicles are provided, and the seat belt retractor is operated at the time of danger. Proximity alarm device. 4. The dangerous amount is the relative speed vf _R / of the vehicle.
The amount obtained by correcting f ₀ with the turn-around speed of the following vehicle, that is, the dangerous amount X is The proximity alarm device according to claim 1, wherein f _{0 is a} transmission frequency, f _{R is a} reception frequency, and v is a propagation velocity of ultrasonic waves. 5. The proximity warning device according to claim ₁ , wherein the deviation width W is W = l ₁ ² −l ₂ ² .