JPH0321466Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is designed to prevent double collisions between the moving barrier and the collided vehicle in rear collision tests using a moving barrier.Double collision prevention in rear collision tests using a moving barrier Regarding equipment.

FMVSS (United States Safety Regulations) safety standards require that there be no fuel leaks in the vehicle being hit during a rear collision test using a moving barrier. In a rear collision test using such a moving barrier, the moving barrier has a driving force, so after colliding with the collision vehicle, the moving barrier temporarily retreats in a direction away from the collision vehicle, but the driving force causes the collision vehicle to move again. A double collision occurred when the moving barrier collided with
The drawback was that the accuracy of the rear impact test was poor.

This idea was made in view of the above points,
The purpose of this test is to prevent double collisions between the moving barrier and the vehicle being collided in rear collision tests using a moving barrier, and to improve the test accuracy of rear collision tests using a moving barrier.
The purpose of the present invention is to provide a heavy collision prevention device.

Hereinafter, a double collision prevention device for a rear collision test using a moving barrier according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram schematically showing the apparatus. In the figure, reference numeral 11 indicates a vehicle to be collided, and a contact point a1 is provided on a rear bumper 12 of the vehicle to be collided. Further, 13 is a moving barrier, and the collision wall 14 is provided with a strip-shaped contact point a2. Further, 15 is a tire, and 16 is an emergency stop device for stopping the moving barrier 13. Signals from the contacts a1 and a2 and the emergency stop device 16 are connected to a control box 17, respectively. This control box 1
The control circuit in 7 will be described later using FIG.

Next, FIG. 2 is a wiring diagram of the double collision prevention device shown in FIG. 1. In FIG. 2, the contact a1 shown in FIG. 1 is connected to the terminal a of the control box 17, and the contact a2 is connected to the terminal b via a 3V battery 21, for example. That is, when the moving barrier 13 rear-ends the collided vehicle 11, the contacts a1 and a2 close. Therefore, a potential difference in the battery 21 is generated between terminal a and terminal b. Also, 22 is for example
The control box 17 is supplied with a 12V battery. Here, B1 and B2 are check buttons for checking the voltages of the batteries 21 and 22. Further, a relay 23 is connected to the control box 17, and an excitation coil 23l of the relay 23 is connected to a control circuit within the control box 17. Further, the relay switch 23S of the relay 23 is connected to the emergency stop device 16 shown in FIG. That is, when the excitation coil 23l is excited, the relay switch 23S is closed and, for example, 100V AC power (not shown) is supplied to the emergency stop device 16, and the moving barrier 13 is stopped. Here, switch S1 is an emergency stop switch for the moving barrier 13, and B3 is a check button for checking the voltage across the relay switch 23S.

Next, use Fig. 3 to set up control box 1.
The detailed control circuit in 7 will be explained. In FIG. 3, terminals a and b shown in FIG. 2 are each connected to a photocoupler 31. In FIG. The collector of the transistor Q1 in the photocoupler 31 is connected to an integrating circuit 32 consisting of a resistor R2 and a capacitor C2.
is connected. Furthermore, the output of the integration circuit 32 is input to a buffer circuit 36. This buffer circuit 36 includes two inverters 34 and 35 and a resistor R.
Consists of 4. Furthermore, the output of the buffer circuit 36 is input to a first mono-multivibrator 37. The output pulse width of this first mono-multivibrator 37 is determined by the values of resistor R5 and capacitor C5. Further, the output of the first mono-multivibrator 37 is input to a second mono-multivibrator 38. The output pulse width of this second mono-multivibrator 38 is set by a resistor R6,
It is determined by the value of capacitor C6. moreover,
The output of the second mono-multivibrator 38 is connected to the base electrode of the transistor Q2 via an inverter 39. Furthermore, the emitter of the transistor Q2 is input to the base electrode of the transistor Q3. By the way, the example shown in Figure 2
The 12V voltage of the battery 22 is connected to the collector of the transistor Q3 via the diode D1 and the relay coil 23l in the relay 23. By the way, R
1, R7, and R8 are resistors, and C1 and C7 are capacitors.

Next, the operation of this invention configured as described above will be explained. The double collision prevention device according to this invention will be explained in detail while explaining a rear collision test using a moving barrier. When the moving barrier 13 moves as shown by arrow A in FIG. 1 and collides with the stopped vehicle 11, the contact point a1 and the contact point a
2 closes. Then, after the collision, the moving barrier 13 and the collided vehicle 11 are separated by reaction, so that the contacts a1 and a2 are opened. When the contacts a1 and a2 are closed, the voltage of the battery 21 shown in FIG. 2 is supplied between the terminals a and b in FIG. 3. Therefore, the photocoupler 31 is activated, and after the collision, the photocoupler 31 is deactivated. Figure 4 shows the voltage waveform at point A in Figure 3 from the time of the collision to after the collision.
Shown below. In FIG. 4A, t ₁ indicates the time of the collision, and t ₂ indicates the end of the collision. Then, the voltage at point A as shown in FIG. 4A is input to the integrating circuit 32.
As a result, the output of the integrating circuit 32 (that is, point B)
The waveform becomes as shown in FIG. 4B. Next, the voltage at point B as shown in FIG. 4B is input to the buffer circuit 36. As a result, the output (ie, point C) waveform of the buffer circuit 36 becomes as shown in FIG. 4C. Next, the voltage at point C as shown in FIG. 4C is input to the first mono-multivibrator 37. As a result, the first mono-multivibrator 3
The output waveform of point 7 (that is, point D) is as shown in FIG. 4D. That is, from the time of collision _t1 , a one-shot pulse that is at the H level for a certain period of time in synchronization with the fall of the voltage waveform shown in FIG. 4C is outputted from the first mono-multivibrator 37. Next, the output of the first mono multivibrator 37 is input to a second mono multivibrator 38. As a result, the output waveform of the second mono-multivibrator (that is, point E) becomes as shown in FIG. 4E.
The output of the second monomultivibrator 38 shown in FIG. 4E is inputted to the base of the transistor Q2 via an inverter 39. As a result, transistor Q2 is turned on, and accordingly transistor Q3 is also turned on. Therefore, the exciting coil 23l is excited and the relay switch 23S is closed. Therefore, the emergency stop device 16 is driven and the moving barrier 13 is stopped. Relay switch 23
The emergency stop device 16 is driven only while S is closed, and this time is determined by the time constant of the resistor R6 and capacitor C6 connected to the second mono-multivibrator 38. In other words, the emergency stop device 16 is activated with a delay of the output pulse width a (for example, 0.55 seconds) of the first mono-multivibrator 37 from the time of collision _t1 . Therefore, the output pulse width a is determined by the resistance R5 and capacitor C5 connected to the first monomultivibrator 37.
The optimum value can be determined by the time constant. That is, by appropriately selecting this time constant, the emergency stop device 16 can be activated after a predetermined number of seconds have elapsed from the end of the collision at _t2 .

As detailed above, according to this invention, in a rear collision test using a moving barrier, when the moving barrier collides with a vehicle and then moves away from the vehicle due to the reaction, the emergency stop device is activated. I made the moving barrier stop, so
Double collisions between the moving barrier and the collided vehicle can be prevented. Therefore, the accuracy of the combustion leak test in the rear collision test using the moving barrier can be improved, and excellent automobiles can be produced.

[Brief explanation of the drawing]

Fig. 1 is a diagram schematically showing a double collision prevention system for a rear collision test using a moving barrier according to an embodiment of this invention, and Fig. 2 is a wiring diagram of the double collision prevention system according to the same embodiment. , FIG. 3 is a diagram showing the detailed control circuit inside the control box shown in FIG. 2,
FIG. 4 is a timing chart showing the operation. 11... Collided vehicle, 13... Moving barrier, 16... Emergency stop device, 17... Control box, 31... Photo coupler, 37... First mono multivibrator, 38... Second mono multivibrator .

Claims (1)

[Scope of utility model registration request] A first contact provided on the collided vehicle, a second contact provided on the moving barrier side, an emergency stop device provided on the moving barrier side that stops moving, and an operation that activates this emergency stop device. means, a delay means for delaying a signal generated by closing the first contact and the second contact for a predetermined period of time, and means for activating the actuating means by the output signal of the delay means. A dual collision prevention device tested in rear collisions using a distinctive moving barrier.