JPH0868719A - Automobile collision experiment device - Google Patents

Abstract

PURPOSE: To achieve collision at a target speed by automatically correcting the amount of reduction until the collision after disconnecting the towing of a vehicle to be experimented. CONSTITUTION: In a collision experiment device for achieving collision by controlling an electric motor 2 for driving a wire 4 for towing a vehicle to be experimented with a speed command VR in a specific pattern and disconnecting the towing in a constant-speed state after acceleration ends, an operation circuit 21 for obtaining a towing force F from an electric motor detection current I and a detection part 22 for detecting the end of acceleration from the towing force F are provided. Also, a memory part 23 for storing a friction FM of the towing device at a speed V at that time by driving the vehicle only with the towing device immediately before the experiment, a part 24 for setting a mass MV of the vehicle to be experimented, and an operation circuit 25 for obtaining an amount of reduction ΔV from a driving resistance FL and an equivalent mass MV of the vehicle which is set by obtaining the driving resistance FL by subtracting the stored towing device friction FM from electric motor drive force after the end of acceleration are provided and then the amount of reduction ΔV is added to a speed command VR for controlling the electric motor 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle collision test apparatus for pulling a vehicle to be tested by a wire and separating and colliding after completion of acceleration, and more specifically, for compensating for deceleration after separating and colliding at a target speed. Car crash test equipment.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, an automobile collision test apparatus has a vehicle under test 1 towed by a towing vehicle 5 and travels from a point P _{0, and at a} point P _{2 the} vehicle is separated and coasted. Collide with the colliding object 7 at the point P ₃ . The tow truck 5 is towed by the wire 4 traveling by the rotation of the wire drum 3 driven by the drive electric motor 2, and the electric motor 2 is accelerated in the sections P ₀ and P ₁ when the speed of the vehicle under test 1 is increased as shown in FIG. P ₁ ,
The speed is controlled to be constant in the P ₂ section.

[0003]

The vehicle under test 1 is required to be in a free state at the time of a collision, and needs to be separated from the towing vehicle 5. In order to reduce the deceleration amount ΔV due to coasting after separation, it is considered to make the section P ₂ and P ₃ (L ₃ ) as short as possible, but the vehicle condition at the time of collision is high just before the collision object 7. There is a pit 8 for shooting with a speed camera or the like, and the separating device 6 has to be provided closer to the starting point than this.

Therefore, the deceleration amount ΔV cannot be made zero, and the speed command of the electric motor 2 is set to a slightly higher value in consideration of this ΔV. Usually, this ΔV is estimated in consideration of the target collision speed, the mass of the vehicle under test (including the mounted object), the running resistance, the wind direction and the strength, and the like. However, since the running resistance of the vehicle under test is unknown, the accuracy of this ΔV value is often not very good.

The present invention has been made in view of the above-mentioned problems of the prior art, and its object is to automatically correct the deceleration amount of the vehicle under test after the towing and disconnecting until the collision and set the target. An object of the present invention is to provide an automobile collision experiment device capable of colliding at a speed.

[0006]

In order to achieve the above object, the collision test apparatus according to the present invention controls a prime mover that drives a wire for pulling a vehicle under test with a speed command in a predetermined pattern, and after acceleration is completed. In the collision experiment device that separates the tow in the constant speed state and collides, (1) if the standard running resistance of the vehicle under test is unknown, a memory unit that stores the friction amount of the tow device in advance corresponding to the vehicle speed, By calculating the running resistance of the vehicle under test by subtracting the stored friction value corresponding to the vehicle speed of the traction device from the driving force of the known prime mover after the acceleration, the running resistance of the known vehicle and A calculation circuit for calculating a deceleration amount from the pulling separation to a collision based on the set known equivalent mass of the vehicle and a circuit for adding the deceleration amount to the speed command after the acceleration is completed are provided.

(2) When the standard running resistance of the vehicle under test is known, the running resistance memory section for storing the standard running resistance of the vehicle under test and the wind direction, wind speed, vehicle weight, air density, etc. during the experiment are set. A correction constant setting unit, a standard running resistance stored by the set correction constant is corrected and calculated, and a deceleration speed calculation circuit that back-calculates the deceleration from traction separation to collision from the corrected running resistance, A circuit for adding this deceleration amount to the speed command after the acceleration is completed is provided.

[0008]

In the case of (1), the running resistance after the acceleration of the vehicle under test is obtained by subtracting the stored friction value corresponding to the vehicle speed of the towing device from the driving force of the prime mover after the acceleration is completed. Further, the amount of deceleration due to coasting can be obtained from this running resistance and the set known vehicle equivalent mass.

Therefore, if the deceleration amount is added to the speed command after the end of acceleration to increase the speed of the driving prime mover, the deceleration amount until the collision is compensated, so that the speed at the time of collision can be set as the target speed. It will be possible.

In the case of (2), the stored standard running resistance is corrected by the set constants such as wind direction, wind speed, vehicle weight, and air density at the time of the experiment, and the test vehicle is allowed to run at the time of the experiment. Resistance is required. Then, from this corrected running resistance, the deceleration from the separation of the towing to the collision can be obtained by back calculation. Therefore, if this deceleration is added to the speed command, the speed at the time of collision can be set as the target speed as in the case of (1).

[0011]

Embodiments of the present invention will be described with reference to the drawings.

Embodiment 1 FIG. 1 shows a control circuit configuration of a drive motor, and FIG. 2 shows a timing chart for correcting a deceleration amount ΔV by coasting. In FIG.
11 is a speed command generator that gives the speed command V _R by V _R = A√L (A is a coefficient, L is a traction distance), and 12 is a speed command (+), a speed detection value (-), and ΔV correction. A matching device that outputs a signal with which a value (+) is matched, 13 is a motor control device that drives the driving motor 2 with this signal as a speed setting, 1
Reference numeral 4 is a current detection device that detects the electric motor current from the secondary current of the current transformer CT, and 15 and 16 are speed detection devices that detect the traction speed V and the traction distance L from the pulse from the pulse generator provided in the electric motor 2. And distance detection device.

20A (21 to 25) is a deceleration correction device,
Reference numeral 21 is a traction force calculation circuit for obtaining a traction force F from the detected current I. Reference numeral 22 is an input of the traction force F, the velocity V and the distance L from the detection devices 15 and 16, and the acceleration is ended when the velocity V is constant and the traction force F is reduced. An end-of-acceleration detecting unit for detecting the traction device 23, and a traction device friction memory unit 23 for obtaining and storing the friction F _{M of the} traction device with respect to the speed V from the speed V and the traction force F when driven by only the traction device immediately before the experiment, 24
Mass setting section of the test vehicle, the switches S1 ₂ ON operating at the end of acceleration detection 25, the traction force F, the friction F _M of the retraction device, the deceleration amount △ V from the mass setpoint M _V and the deceleration section distance L This is a deceleration amount calculation circuit that calculates and outputs the deceleration amount ΔV to the matching device 12 via the switch S1 ₁ which is interlocked with the switch S1 ₂ .

Next, the operation of the embodiment will be described. For coasting deceleration section is very short, the running resistance F _L of the vehicle is the cause of the reduction can be considered as constant. On the other hand, the traction force F of the drive motor 2 when the vehicle under test is towed at the speed V is represented by the equation (1).

[0015]

[Number 1] _{F = F M + F L +} (M V + M S) α .........
(1) where F _{M is} the friction of the towing device at speed V, M _{V is} the mass of the vehicle, M _{S is} the equivalent mass of the device drive part, and α is:
Acceleration / deceleration.

In the constant speed state, α = 0, therefore

[0017]

[Number 2] _{F L = F-F M .........} (2) Therefore, just prior to the experiment, driven only by the traction device, by storing the F _M value for the speed V in the memory unit 23, F _L value You can know.

On the other hand, when the deceleration during coasting of the test vehicle due to the running resistance F _L is α _L , the distance L _{3 in the} deceleration section is

[0019]

(Equation 3)

[0020] However, V _0: speed ≒ target speed at the time of disconnection (= V _R) t _L: coasting time _{α L · t L = △ V} , therefore

[0021]

[Equation 4]

[0022]

(Equation 5)

Rewriting equation (4),

[0024]

[6] _{^{△ V 2 -2V 0 △ V +}} 2α L · L 3 = 0 ......... (6) (5), the resulting deceleration amount △ V determined from equation (6). That is, the deceleration amount calculating circuit 25 calculates a △ V command by (6), and outputs from the switch S1 ₁ to △ V to butt 12, the speed command V velocity command obtained by adding the _R V _R + △ V Control the drive motor 2. Then, the traction speed V increases by ΔV at the end of acceleration as shown in FIG. As a result, the speed at which the vehicle travels the coasting distance L ₃ and collides with the collision object becomes the target speed.

As described above, in this embodiment, the friction amount of the towing device is stored in advance in correspondence with the vehicle speed, and this value is subtracted from the electric motor driving force after completion of acceleration,
The running resistance of the vehicle under test is calculated, the deceleration amount is calculated from this and the equivalent mass of the known vehicle (including the mounted object), and the drive motor speed is controlled by the speed command added to the target vehicle speed. Therefore, the error due to coasting deceleration after disconnection can be automatically corrected. Therefore, the speed accuracy at the time of collision is improved.

Embodiment 2 FIG. 3 shows the control circuit configuration of the drive motor. In the figure, the same components as those shown in FIG. 1 (Embodiment 1) are designated by the same reference numerals, and the duplicated description thereof will be omitted. Referring to FIG. 3, 20B is a deceleration correction device when the standard running resistance of the vehicle under test is known. The memory unit 26 stores the standard running resistance of the vehicle under test, and the wind direction, wind speed, vehicle weight, and air density correction constant. A setting unit 27, a standard running resistance from the memory unit 26 and various deceleration values from the setting unit 27, a deceleration amount calculation circuit 28 for calculating a ΔV value from a coefficient and outputting the ΔV value to the matching unit 12 at the end of acceleration. It is composed by. Other configurations are the same as those in FIG.

Next, the operation of this embodiment will be described. The running resistance of the vehicle under test that causes coasting deceleration after separation is assumed to be a standard value known from vehicle design data or preliminary experiments. This value is stored in the memory unit 26. The running resistance _FL is usually expressed by the equation (7).

[0028]

(Equation 7)

However, μ: rolling resistance coefficient, W: vehicle weight, C: air resistance coefficient, A: front projected area of the vehicle body, ρ: air density, V: speed.

Here, the rolling resistance coefficient μ depends on the road surface in the experimental field and the tire conditions used, and the air resistance coefficient C and the front projected area A of the vehicle body depend on the vehicle used. And it is not necessary to consider that these change according to the situation at the time of experiment.

The following are the main factors of variation during the experiment, and the accuracy of the deceleration component calculation can be increased by inputting these and making a correction calculation. These are set by the setting unit 27
Set to.

W: Correct the mass of the measuring instruments mounted on the vehicle ρ: Correct by the atmospheric conditions V: Measure the wind direction and speed and calculate it as the atmospheric speed of the experimental vehicle.

The deceleration amount calculation circuit 28 first uses the standard running resistance stored in the memory unit 26 and the correction values W, ρ and V set in the setter 27 to correct the running resistance F _L according to the equation (7). Is calculated, and then the deceleration amount ΔV is calculated by the formula (6) of the first embodiment. This ΔV value is output to the matching device 12 and the deceleration amount ΔV is added to the speed command V _R. The electric motor 2 is controlled by the applied speed command V _R + ΔV.

As described above, in this embodiment, in order to correct the error due to coasting deceleration after disconnecting from the tow wire, the standard running resistance of the vehicle under test is corrected and calculated according to the conditions at the time of the experiment, and the deceleration is thereby performed. Is calculated back and the speed of the drive motor is controlled by the speed command obtained by adding this to the target collision speed, so the traction speed is increased to ΔV at the end of acceleration, so the coasting distance L ₃ travels and the collision object The speed at the time of collision with is the target speed. Therefore, the accuracy of the collision speed is improved as in the first embodiment.

[0035]

Since the present invention is configured as described above, it has the following effects.

(1) According to the invention of claim (1), an error due to coasting deceleration after separation can be automatically corrected to improve collision accuracy.

(2) According to the invention of claim (2), the error due to the coasting deceleration after the disconnection can be corrected by a simple calculation of the known vehicle running resistance by the fluctuation factor at that time to improve the collision accuracy. .

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a wire drum drive control device according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating ΔV correction timing according to the first embodiment.

FIG. 3 is a block diagram showing a configuration of a wire drum drive control device according to a second embodiment.

FIG. 4 is an explanatory view of a towing system of an automobile collision experiment device.

FIG. 5 is a diagram illustrating the speed of the vehicle under test.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Vehicle to be tested 2 ... Driving motor 3 ... Wire drum 4 ... Wire 5 ... Towing vehicle 6 ... Separation device 7 ... Collision object 8 ... Shooting pit 11 ... Speed command generator 12 ... Gating device 13 ... Motor control device 14 ... Current detection device 15 ... Velocity detection device 16 ... Distance detection device 20 ... Deceleration amount (ΔV) correction device 21 ... Traction force calculation circuit 22 ... Acceleration end detection unit 23 ... Traction device friction memory unit 24 ... Mass setting unit 25 ... Deceleration amount (ΔV) arithmetic circuit 26 ... Running resistance memory unit 27 ... Correction constant setting unit 28 ... Deceleration amount (ΔV) arithmetic circuit

Claims (2)

[Claims] 1. A collision experiment device in which a prime mover for driving a wire for pulling a vehicle under test is controlled by a speed command in a predetermined pattern to separate and collide the tow at a constant speed state after completion of acceleration. Minutes corresponding to the vehicle speed, the equivalent mass setting unit of the known vehicle, and the driving force of the prime mover after the acceleration is completed by subtracting the stored friction value corresponding to the vehicle speed of the towing device. A calculation circuit that calculates the running resistance of the experimental vehicle and the deceleration amount from the separation of the towing from this running resistance and the set equivalent mass of the known vehicle to the collision, and the speed after this deceleration amount is accelerated. A vehicle collision experiment device characterized in that a circuit for adding to a command is provided so that a speed at the time of a collision becomes a target value. 2. A collision test apparatus for controlling a prime mover for driving a wire for pulling a vehicle under test with a speed command in a predetermined pattern, and separating the tow to cause a collision at a constant speed state after completion of acceleration, A running resistance memory unit that stores the standard running resistance, a correction constant setting unit that sets the wind direction, wind speed, vehicle weight, air density, etc. during the experiment, and the standard running resistance stored by the set correction constants is corrected. There is a deceleration speed calculation circuit that calculates the deceleration from the towing disconnection to the collision from the corrected running resistance, and a circuit that adds this deceleration to the speed command after acceleration is completed. A vehicle collision test device characterized in that