JP4816430B2 - Vehicle collision test equipment - Google Patents

Description

  The present invention relates to a vehicle collision test apparatus suitable for use in a vehicle collision experiment.

  The vehicle collision test apparatus is installed at a vehicle research institute for research and development of a risk prevention technique in the event of a traffic accident. This collision test apparatus accelerates a test vehicle from a stopped state to a target speed, then disconnects the test vehicle, and places the test vehicle on a concrete collision barrier placed in front of the runway or an object installed in a collision space. It is what makes it collide.

  Conventionally, in this type of vehicle collision test apparatus, depending on the technology (for example, Patent Document 1) for controlling the traction force generated on the wire in order to cause the test vehicle to collide with the abstract barrier at the target speed, depending on the vehicle type and vehicle weight There exists a technique (for example, patent document 2) which controls the traction force generated on a wire.

JP-A-8-68719 JP-A-7-35651

  However, the techniques described in Patent Documents 1 and 2 do not have a function of detecting a decrease in target speed that occurs due to deterioration over time due to wire slipping or the like. For this reason, the operator notices that the wire slip has occurred when the target speed is lowered during the experiment, that is, only after the collision test fails. As a result, the cost of the collided development vehicle, the delivery date, and the like were wasted due to the re-experiment.

Hereinafter, the structure of a basic vehicle collision test apparatus will be described.
As shown in FIG. 4, the vehicle collision test apparatus 10 is driven by pulling the wire rope 11. The wire rope 11 is installed in a loop shape through a wire guide (both not shown) in a wire groove installed on the runway r (from the stop position to the release position R), and at least one of the both ends thereof. At the end, a rope winch 12 is provided for applying a traction force to the wire rope 11. The rope winch 12 is driven by a DC motor 13 and applies a traction force acting in the direction of arrow A to the wire rope 11 to move the test vehicle C in the stop position S in the direction of arrow A.

  The wire rope 11 and the test vehicle C are connected by a dolly wire 15 via a pulling dolly 14 provided in a wire groove. The pulling dolly 14 cuts off the dolly wire 15 by contacting the striker 16 fixed at the release position R. The separated test vehicle C slides toward the collision barrier B.

  The DC motor 13 is provided with a rotation speed detector 17. The DC motor 13 is current-controlled by the controller 18 so that the speed calculated from the rotational speed of the DC motor 13 detected by the rotational speed detector 17 becomes a vehicle speed diagram as shown in FIG. The controller 18 controls the current supplied to the DC motor 13 while monitoring the rotational speed from the rotational speed detector 17 so that the speed changes along the vehicle speed diagram. The speed is easily calculated from the drum diameter and the rotational speed of the rope winch 12.

  However, in the vehicle collision test apparatus 10 described above, the traction force applied to the wire rope 11 is transmitted by the frictional force generated between the wire rope 11 and the rope winch 12. The pulling dolly 14 connects the dolly wire 15 by a frictional force when the dolly wire 15 is sandwiched by the clamp on the pulling dolly 14 side.

  As described above, since the wire is constrained by the frictional force, mechanical slip occurs when the rope winch 12 is driven due to deterioration with time or the like. For this reason, before the actual test vehicle C reaches the release position R, the vehicle C reaches the release position R on the vehicle speed diagram. That is, as the slip increases, the time point on the vehicle speed diagram when the actual test vehicle C reaches the release position R moves in the arrow d direction (dotted line). When wear is promoted and mechanical slip increases, the actual test vehicle C reaches the release position R at the position where the vehicle speed starts to decelerate, and the test vehicle C slides at the target speed. It becomes impossible to do.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a vehicle collision test apparatus that can detect a decrease in target speed when a test vehicle is disconnected due to mechanical wear. Yes.

To achieve the above object, the configuration of a vehicle collision test apparatus to which the present invention is employed, just before before Symbol collision barrier disconnect the traction wire releases the position of the collision barrier is towed the test vehicle by towing wire A collision test apparatus for a vehicle to be collided, comprising: a rotation driving unit that rotationally drives a winding drum that applies a pulling force to the pulling wire; and a rotational speed of the rotation driving unit is detected to measure a moving speed of the pulling wire. A speed measuring means, a rotational speed control means for controlling the rotational speed of the rotational drive means so that the speed measured by the speed measuring means becomes a predetermined speed curve, and provided at the release position, and arrival detection means for testing for a vehicle to detect the arrival, vehicle wherein the test the winding drum from the start of the driving rotation reaches to the release position The actual arrival value measuring means for measuring the actual arrival value, which is the arrival value until the arrival detection means detects the actual arrival value, the actual arrival value measured by the actual arrival value measuring means, and the winding drum rotating Comparing means for comparing with a theoretical reach value set in advance as a reach value from when the driving is started until the test vehicle reaches the release position is provided.

In the vehicle collision test apparatus, the actual arrival value measuring means is a period from when the winding drum starts to rotate until the arrival detecting means detects that the test vehicle has reached the release position. The actual traveling time is measured, and the comparing means measures the actual traveling time measured by the actual reached value measuring means and the test vehicle moves from the release position after the winding drum starts to rotate. It is characterized by comparing a theoretical traveling time set in advance as a time until reaching the position.

In the vehicle collision test apparatus, the actual arrival value measuring means is a period from when the winding drum starts to rotate until the arrival detecting means detects that the test vehicle has reached the release position. Meanwhile, an integral value of the speed of the test vehicle calculated from the number of rotations of the rotation driving means is calculated, and the comparison means is configured such that the integral value calculated by the actual reach value measuring means and the winding drum are It is characterized by comparing the distance from the start of rotational driving to the time when the test vehicle reaches the release position .

In the vehicle collision test apparatus, it is preferable that the comparison unit compares the actual reach value with a value obtained by adding a constant value to the theoretical reach value .

<Embodiment>
Hereinafter, a vehicle collision test apparatus according to an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, the same components as those of the vehicle collision test apparatus 10 described in the above-described prior art are denoted by the same reference numerals, and description thereof is omitted.

  A feature of this embodiment is that a current is supplied to the DC motor 13 that drives the rope winch 12 to cause a traction force to act on the test vehicle C at the stop position S, and then the vehicle C moves to the release position R. By comparing the two times as the actual actual travel time (actual reach value) and the theoretical travel time (theoretical reach value) calculated in the controller 23, the time to run on the runway r until passing through is compared. The point is that wire slip is detected before a decrease in the target speed at the time of separation occurs.

  The vehicle collision test apparatus 20 is provided with an arrival detector 21 on the release position R. The arrival detector 21 includes a tape switch 22 attached on the road surface at the release position R. The tape switch 22 detects that the test vehicle C has reached the release position R and has come into contact with the tape 22 </ b> A, and outputs a detection signal to the controller 23.

As shown in FIG. 2, the controller 23 includes a CPU (Central Processing Unit) 24, a ROM (Read Only Memory) 25, a RAM (Random Access Memory) 26, an operation unit 27, and the like. The ROM 25 is provided with a device control program and a timer mechanism, which will be described later, and a storage unit (not shown) stores a vehicle speed diagram, a theoretical travel time T0, and an allowable range value ΔT. The RAM 26 is used as a work area when executing the program.
Further, the arrival detector 21 and the rotational speed detector 17 are connected to the input side of the input / output unit 28 of the controller 23, and the display unit 29 is connected to the output side.

Next, the control operation of the vehicle collision test apparatus 20 will be described with reference to FIG.
The controller 23 starts a control operation and starts a timer according to a setting input of the operation unit 27 by an operator. The controller 23 detects the rotational speed n of the DC motor 13 from the rotational speed detector 17 (step S1), and calculates the rotational speed n from the rotational speed ratio between the DC motor 13 and the rope winch 12 and the drum diameter of the rope winch 12. The velocity v is calculated corresponding to (step S2).

  Next, the controller 23 reads out the speed corresponding to the control start time from the vehicle speed diagram, calculates the command current value supplied to the DC motor 13 by comparing this read speed with the calculated speed v, and outputs the command current value. (Step S3).

  The controller 23 determines whether or not there is a detection signal from the arrival detector 21, and determines whether or not the test vehicle C has reached the release position (step S4). If not reached (step S4; NO), the processing after step S1 is repeated, and feedback control is performed so that the speed v approaches the curve of the vehicle speed diagram.

On the other hand, when the vehicle C reaches the release position R (step S4; YES), the controller 23 proceeds to step S5.
The controller 23 calculates the time until the vehicle C reaches the release position R from the stop position S as the actual travel time T from the timer, and reads the theoretical travel time T0 and the allowable range value ΔT from the storage unit (step S5). .

The controller 23 determines whether or not the actual travel time T <theoretical travel time (T0 + ΔT) (step S6).
In this determination step, when the actual travel time T is less than or equal to the theoretical travel time (T0 + ΔT) (step S6; YES ), it is assumed that the actual travel time is within the theoretically set travel time, and the wire and the wire A message indicating that the wire is operating without "slip", for example, "no slip", is displayed on the display unit 29 (step S7).

On the other hand, in the determination step, when the actual travel time T > theoretical travel time (T0 + ΔT) (step S6; NO ), the actual travel time comes after a theoretically set travel time has elapsed. Therefore, the frictional force generated between the wire and the wire receiving portion is reduced, and a message indicating that the wire is “sliding”, for example, “slipping, maintenance required” is displayed on the display unit 29. (Step S8).

As described above, the vehicle collision test apparatus 20 monitors the mechanical “slip” caused by a decrease in frictional force when the wire rope 11 or the dolly wire 15 is restrained, and thereby monitors the diameter early. “Slip” due to time degradation can be detected, and it can be known in advance that the test vehicle has not reached the target speed before the target speed at the time of separation changes.
As a result, an inexpensive vehicle collision test apparatus 20 with a simple structure can be realized without performing complicated arithmetic processing with a plurality of detectors. Further, it is possible to restrict the test without noticing that the target speed has decreased when the test vehicle C is disconnected, and the reliability of the vehicle collision test apparatus 20 can be improved.

<Modification 1>
In the embodiment described above, the actual reached value is the actual actual running time with respect to the time during which the test vehicle C slides on the runway r from the stop position S to the release position R. However, the present invention is not limited to this, and the actual reached value for the distance of the runway r until the test vehicle C passes the release position R from the stop position S is not limited to this. The actual actual travel distance may be used, and the theoretical reach value may be the theoretical travel distance calculated in the controller 23.

  In this case, the theoretical travel distance L0 and the allowable range value ΔL are stored in the storage unit, and the controller 23 sequentially stores the speed v calculated from the rotation speed n with respect to the elapsed time, and integrates this speed v. Thus, the actual travel distance L is calculated. Then, the “slip” may be determined by comparing the actual travel distance L and the theoretical travel distance (L0 + ΔL).

<Modification 2>
In the embodiment and the first modification, mechanical “slip” is determined by arithmetic processing in the controller 23, but a hardware circuit may be used.

<Modification 3>
Furthermore, although the arrival detector 21 has been described as a detector that detects that the test vehicle C has contacted the hanging tape 22A, the present invention is not limited to this, and the test vehicle C is in the release position R. If this can be detected, not only a mechanical sensor but also an optical sensor or the like may be used.

1 is a schematic configuration diagram showing a vehicle collision test apparatus according to an embodiment of the present invention. It is a block diagram which shows the controller used for this embodiment. It is a flowchart which shows the control program of a collision test apparatus. It is a schematic block diagram which shows the vehicle collision test apparatus by a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 20 ... Vehicle collision test apparatus, 11 ... Wire rope, 12 ... Rope winch, 13 ... DC motor, 14 ... Traction dolly, 15 ... Dolly wire, 16 ... Striker, 17 ... Revolution detector, 21 ... Arrival detector, 22 ... tape switch, 22A ... tape, 23 ... controller.

Claims (4)

The test vehicle a collision test apparatus for a vehicle colliding before Symbol collision barrier release position disconnecting said traction wire immediately before the collision barrier is towed by towing wire,
Rotation drive means for rotationally driving a take-up drum that applies traction force to the traction wire;
Speed measuring means for detecting the rotational speed of the rotation driving means and measuring the moving speed of the pulling wire;
A rotation speed control means for controlling the rotation speed of the rotation drive means so that the speed measured by the speed measurement means becomes a predetermined speed curve;
Arrival detection means provided at the release position for detecting that the test vehicle has arrived;
Actual reach value measuring means for measuring an actual reach value that is a reach value until the arrival detection means detects that the test vehicle has reached the release position after the winding drum starts to rotate. When,
The actual reaching value measured by the actual reaching value measuring means and the theoretical reaching value set in advance as the reaching value until the test vehicle reaches the release position after the winding drum starts to rotate. A vehicle collision test apparatus comprising a comparison means for comparing The vehicle collision test apparatus according to claim 1,
The actual arrival value measuring means calculates an actual traveling time which is a time from when the winding drum starts to rotate until the arrival detecting means detects that the test vehicle has reached the release position. Measure and
The comparison means is preset as an actual travel time measured by the actual arrival value measurement means and a time from when the winding drum starts to rotate until the test vehicle reaches the release position. A vehicle collision test apparatus characterized by comparing the theoretical travel time . The vehicle collision test apparatus according to claim 1,
The actual reached value measuring means is a period between the start of rotation of the winding drum and the detection of the arrival of the test vehicle at the release position by the arrival detecting means. Calculate the integral value of the speed of the test vehicle calculated from the number of revolutions,
The comparing means compares the integral value calculated by the actual reached value measuring means with a distance from when the winding drum starts to rotate until the test vehicle reaches the release position. A vehicle collision test apparatus. The vehicle collision test apparatus according to claim 1,
The comparison means compares the actual reached value with a value obtained by adding a constant value to the theoretical reached value .

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