JP2869846B2 - Vehicle braking performance measurement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring braking performance of a vehicle, which can easily measure the braking performance of an anti-lock brake system of a vehicle.

[0002]

2. Description of the Related Art In recent years, vehicles such as luxury passenger cars are equipped with, for example, a traction control system (TCS) and a non-slip differential device in addition to a braking device such as the above-described antilock brake system (ABS). A full-time 4DW vehicle is equipped with a center differential device and the like.

[0003]

Although these various types of braking devices provide improved maneuverability and safety to the equipped vehicle, special conditions are required for checking their operation. Therefore, conventionally, a rather large-scale performance measuring device has been required.

[0004] The present invention has been made in view of such a conventional situation, and is intended to measure the performance of the above-mentioned various types of braking devices with a relatively simple device. It is intended to provide a performance measuring device.

[0005]

One of the features of the present invention is that when measuring the braking performance of a vehicle to be measured, a pair of wheels before and after the wheels of the vehicle to be measured are rolled and mounted. A vehicle braking performance measuring device includes a frame frame in which rotating rollers are appropriately separated and arranged in parallel, and a drive source for rotatingly driving a rotating roller in front of the frame frame.

According to the first aspect of the present invention, there is provided a portable frame frame 2 installed on a floor surface of a maintenance shop or the like, and a portable frame frame 2 which is appropriately spaced apart from and parallel to the frame frame 2 and is an object to be measured. A pair of rotary rollers 3 and 4 before and after the wheels of the vehicle are rolled and mounted, and a drive source 5 installed in the frame 2 and for rotating the front rotary rollers 3
And inclined plates 10 and 11 attached to the front and rear edges of the frame 2 perpendicular to the axial direction of the rotating rollers 3 and 4 so as to be swingable or detachable.
Corresponding to the four wheels of the vehicle to be measured, four frame frames 2 are arranged on the four wheel portions with the front rotating roller 3 on the front side, and the front and rear edges of each frame frame 2 are The vehicle braking performance measuring device is characterized in that a slope is formed by the inclined plates 10 and 11 so that a vehicle to be measured is carried in.

According to a second aspect of the present invention, there is provided a portable frame frame 2 installed on a floor surface of a maintenance shop or the like, and an object to be measured which is disposed in the frame frame 2 at an appropriate distance and in parallel. A pair of rotary rollers 3 and 4 before and after the wheels of the vehicle are rolled and mounted, and a drive source 5 installed in the frame 2 and for rotating the front rotary rollers 3
A rotation detector 9 for detecting the rotation of the rotation roller 4 behind the frame 2, and a front and rear edge of the frame 2 perpendicular to the axial direction of the surface rollers 3 and 4. Or, the inclined plates 10 and 11 which are detachably attached ,
Hints, during measurement, 4 to correspond to the wheel to the four-wheel portion of four frames frame 2 with arranging the rollers 3 of the front on the front side of the measurement target vehicle, of the respective frame frame 2 The vehicle braking performance measuring device is characterized in that a slope is formed at the front and rear edges by the inclined plates 10 and 11 so that a vehicle to be measured is carried in.

The present invention according to claim 3 is characterized in that the front and rear pair
Of the vehicle to be measured to the valley between the rollers 3 and 4
Characterized in that a bar-shaped lift 12 is installed.
Item 4. The vehicle braking performance measuring device according to item 1 or 2.

[0009]

As described above, in the present invention, all components are portable.
Compactly housed in the mold frame 2
In front of and behind this frame 2, a slope forming slope is formed.
Since the swash plates 10 and 11 are provided, the measurement
Four frame frames 2 are applied to correspond to the four wheels of the elephant vehicle.
It can be used as needed, and after the measurement,
It can be properly cleared. Of course, the frame 2
A pair of front and rear rotating rollers 3 and 4 are arranged inside
Therefore, the braking performance of each of the rotating rollers 3, 4 and the wheels of the vehicle to be measured can be measured according to the braking device of the vehicle to be measured, as described later.

[0010]

1 to 3 show an embodiment of a vehicle braking performance measuring device according to the present invention. The vehicle braking performance measuring device 1 is shown in a conceptual diagram of FIG. As
The measurement target vehicle front and rear wheels of the A (tire) T ₁ through T _4, to respond at a time, may be placed side by side four <br/> to and fro on the floor surface or the like, such as garages.

The braking performance measuring device 1 basically includes
As shown in FIG. 1, the four vehicles have the same portable structure, and a pair of rotating rollers 3 before and after one of the wheels T _{1 to} T ₄ of the measurement target vehicle A is rolled and mounted. 4 has a frame 2 that is appropriately spaced and arranged in parallel.
The front rotating roller 3 includes a driving source 5 such as a motor installed in a part of the frame 2 and a driving force transmission mechanism such as a pulley 6 mounted on a rotating shaft 3a of the rotating roller 3 and a belt or a chain. Through means 7 and pulley 8 of drive source 5
It is rotatably connected. On the other hand, the rear rotating roller 4
A rotation detector 9 for detecting the rotation of the rotation roller 4 is mounted on the rotation shaft 4a.

In addition, when the frame frame 2 is simply installed on a floor surface of a maintenance shop or the like, an inclined plate 10 for filling the upper and lower steps is provided at the front and rear edges of the frame frame 2. 11 is attached to be able to swing. Of course, even if freely configured Remove the inclined plates 10 and 11
Good. Further, in parallel the gap portion between the rollers 3 and 4, each wheel T ₁ through T ₄ to be measured vehicle A that has been carried between the rollers 3 and 4, after the completion of the measurement, push the rotation A lift 12 is provided so that it can be easily carried out (escape) from the valley between the rollers 3 and 4. Although not shown, the lift 12 is configured to move up and down by a hydraulic mechanism or the like.

With the vehicle braking performance measuring apparatus 1 of the present invention configured as described above, the braking apparatus for the vehicle A to be measured is
For example, the performance of an antilock brake system is measured as follows.

First, as shown in the conceptual diagram of FIG. 4, the wheels T _{1 to} T ₄ of the vehicle A to be measured are rolled between the pair of rotating rollers 3 and 4 of the four braking performance measuring devices 1. Place.
In this case, as shown by an arrow B in FIG. 4, each braking performance measuring device 1 is configured such that the rotating roller 3 in front of the braking performance measuring device 1 is on the front side with respect to the front side (front) side of the vehicle A to be measured. , So that the rear rotating roller 4 is on the rear side.

In this state, a measurer (driver) enters the vehicle A to be measured, and the braking system of each of the wheels T _{1 to} T ₄ is set to a neutral state (free state).
Thereafter, the driving source 5 is driven to rotate the front rotating roller 3. By the rotation of the rotating roller 3,
Each wheel _T 1 through T ₄ to be measured vehicle A is rotated. This rotation is performed until the rotation speed corresponding to the operating speed of the antilock brake system (for example, a speed of about 20 to 60 km / h) is reached.

When the predetermined number of revolutions is reached in this way,
The measurer depresses the brake pedal. At this time, if the anti-lock brake system is operating normally, a reaction force (kickback force) for returning the brake pedal acts on the stepping foot of the measurer. From the sense, the measurer can intuitively know the operation of the antilock brake system. in this case,
From the interior of the measurement side, but do not know whether the operation of each individual wheel T ₁ through T _4, from the outside of the measurer (observer), during operation of anti-lock braking system, the rotational speed of the corresponding wheel Since the vehicle repeats deceleration and acceleration, it is also possible to visually confirm the operating state of the anti-lock brake system on each individual wheel from the rotational state of the wheel.

Of course, it can be seen from the rotation data from the rotation detector 9 attached to each rear rotation roller 4. Therefore, to record the rotation data from the rotation detector 9, or if the monitor by a display device (such as a CRT or a liquid crystal display), the more accurately the operating state of the anti-lock braking system in each wheel T ₁ through T ₄ You can figure out.

Such an operation state will be described with reference to FIG.
More specifically, first, before the brake is applied, the center point O of each of the wheels T _{1 to} T ₄ is located on the center line between the rotating rollers 3 and 4 just before and after. Load F at each of the wheels T _{1 to} T _{4 of the} vehicle A to be measured
Is equally divided and loaded on each of the rotating rollers 3 and 4 just before and after. That component force _{F 3} and _{F 4} for each rotation rollers 3 and 4 of the front and rear is kept equal _(F 3 ₌ F 4).
Therefore, the rotational force of the front rollers 3, wheels T ₁ ~
Through T _4, it is smoothly transmitted to the rotary roller 4 behind the at substantially the same speed, rapidly rises to the rotation speed of the desired speed.

[0019] In this state, when applying a braking, for wheel T ₁ to T4 is about to stop, and in particular increase the frictional force between the rotating roller 3 forward, as a result, wheels T
₁ through T ₄ will be moved only slightly to the rear. That is, the wheels _T 1 through T ₄ is moved to the position of the broken line in the figure, the center point O of the moving wheel _T 1 '~T _4' 'also slightly shifted to the rear. Then, the moved wheel T ₁ ′ ~
Component force for each rotation rollers 3,4 'of the load F in the part' T ₄ varies with _{F 3} 'and _{F 4',} moreover, _{F 3}
> F ₃ ′, and F ₄ <F ₄ ′.

[0020] 'When changes, wheel _T 1 is in front of the rotating roller 3 side' Thus the component force _{F 3} of the load force component _{F 3} through T
₄ 'While transmission force tends to decrease with respect to the measurement target vehicle A wheels _T 1''it can coupled with that braked against the wheel _T 1' through T ₄ of through T ₄ ' The rotation speed is
It will decrease rapidly.

At this time, if the antilock brake system of the vehicle A to be measured is operating normally, the vehicle speed is determined from the wheel speeds of the wheels T ₁ ′ to T ₄ ′, and the vehicle speed and the wheel T than the wheel speed of _{1 'through} T _4', with respect to the wheel where the wheel speed is rapidly decreased, the brake liquid of the wheel with reduced pressure, the wheel speed is controlled so as to approach the vehicle speed. When this control is performed, as described above, a reaction force is applied to the stepped foot of the mileage pedal of the measurer such that the mileage pedal is pushed back, and the wheels themselves exhibit a phenomenon of repeating deceleration and acceleration. become.

However, at this time, if any of the anti-lock brake systems of the vehicle A to be measured is defective, when the measurer depresses the brake pedal as described above, the abnormal wheels are locked or all of them are locked. One of the wheels will lock up. of course,
In this case, no reaction force is felt against the stepping foot of the measurer. That is, from the non-sense of the reaction force, it is easy to determine whether the anti-lock brake system is abnormal or defective.

The operating state of such an anti-lock brake system can be graphed as shown in FIG.
V _T is the wheel speed, V _R is measured when the speed level of the rotating roller before and after, V _TF change curve before the wheel speed, V _TB change curve of the rear wheel speed, F _f is the depression of the measurer of the brake pedal The force, F _f ′, shows the curve of the depression force, and C, the normal operation period of the antilock brake system. From this figure, it can be seen that during the normal operation period of the antilock brake system, the front and rear wheel speeds are repeatedly increased and decreased, and the depressing force of the brake pedal is correspondingly changed.

As described above, in the vehicle braking performance measuring device 1 according to the present invention, in addition to being able to measure the antilock brake system, when the vehicle A to be measured is equipped with a traction control system, the performance of the system is measured. Can also be measured as follows.

First, as in the case of the conceptual diagram of FIG.
The wheels T _{1 to} T ₄ of the vehicle A to be measured are rolled and mounted between the pair of rotating rollers 3 and 4 of the braking performance measuring device 1. In this state, a measurement person (driver) gets into the measurement target vehicle A, stops driving the driving source 5, and sets the front and rear rotation rollers 3, 4 in a rotation-free state. The engine of the target vehicle A is driven. This engine driven, via a respective drive wheels _T 1 through T ₂ or _T 3 through T _4, each revolution of the free state rollers 3 and 4
To rotate.

In this case, the traction control system compares the vehicle speed with the drive wheel speed, and determines, for a wheel whose drive wheel speed is abnormally high with respect to the vehicle speed,
Increase the brake fluid pressure to approximate the vehicle speed,
Since the system reduces the rotation of the engine, when the system operates normally, even if the measurer depresses the accelerator pedal, the drive wheels do not rotate and try to maintain a low speed. On the other hand, when there is an abnormality in the traction control system, when the accelerator pedal is depressed, the drive wheels rotate correspondingly. Therefore, the measurer can easily know whether the traction control system is normal or abnormal from these feelings when the accelerator pedal is depressed.

In the case where the left and right wheels of the vehicle A to be measured, for example, the rear left and right wheels T _{3 to} T ₄ are equipped with a non-slimp differential device, the left and right wheels T ₃ to T _{4 are used} .
Since the speed difference T ₄ is controlled to be minimized, the traction control left and right rotation speed difference of the wheels T ₃ through T ₄ during the same operation as in the system (each corresponding rotation detection 9, Difference in rotation speed obtained in 9)
Thus, the quality of the non-slimp differential device can be easily measured.

Further, the vehicle A to be measured is full-time 4W
In the case of the D vehicle, when the center differential device is provided, the vehicle is controlled so that the speed difference between the front and rear wheels T _{1 to} T ₃ and T _{2 to} T ₄ is minimized. If the same operation before and after when the wheel T ₁ ~T _3, T ₂ rotational speed difference through T ₄ by (difference in rotational speed obtained in each of the corresponding rotation detection 9,9), the center differential device Pass / fail can be easily measured.

[0029]

As is clear from the above description, the following excellent effects can be obtained by the apparatus for measuring the braking performance of a vehicle according to the present invention.

(1) First, a frame frame in which a pair of rotating rollers before and after the wheels of the vehicle to be measured are rolled and mounted are appropriately separated and arranged in parallel, and a rotating roller in front of the frame frame. The driving source is driven in a state where the wheel of the vehicle to be measured is rolled and mounted between the pair of front and rear rotating rollers, and the front rotating roller is rotationally driven. On the other hand, when the brake is applied, the performance of the anti-lock brake system can be easily measured by the sense of the measurer (driver) or visually by an external measurer (observer).

(2) If a rotation detector is mounted on the rear rotating roller, the performance of the antilock brake system can be measured from the rotation state of the rear rotating roller.

(3) In the performance measurement of the anti-lock brake system, a method is used in which the front rotating roller is driven to rotate, and at this time, a large load of the vehicle to be measured is applied to the rear rotating roller side. Since the load of the front rotating roller is reduced, a small driving source can be sufficiently used. As a result, this drive source
All the components, including the components , can be easily incorporated into the frame, and all components are
It can be compactly stored in the frame body, and the vehicle to be measured during measurement
Four frame frames are appropriately arranged to correspond to the four wheels
It can be used after the measurement is completed.
Therefore, it is possible to provide a braking performance measuring device that is excellent in usability.

[0033] (4) Since it has an inclined plate is provided on the front and rear of the frame frame, it can be easily carried in the measurement target vehicle,
If a lift is provided between the front and rear rotating rollers,
The measurement target vehicle can be easily carried out, and good usability can be obtained.

(5) Further, the braking performance measuring device for a vehicle not only measures the performance of the antilock brake system, but also measures the performance of a traction control system, a non-slip differential device, and a center differential device for a full-time 4DW vehicle. Can be performed, and broad versatility is obtained.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an installed state according to an embodiment of a vehicle braking performance measuring apparatus according to the present invention.

FIG. 2 is a partially cutaway plan view showing the vehicle braking performance measuring device of FIG. 1;

3 is a partially cutaway side view showing a rolling contact relationship between front and rear rotating rollers and wheels of a vehicle to be measured in the vehicle braking performance measuring device of FIG. 1;

FIG. 4 is a conceptual diagram showing an outline at the time of measurement by the vehicle braking performance measuring device of FIG. 1;

FIG. 5 is an explanatory diagram showing an operation principle of the braking performance measuring device for a vehicle in FIG. 1;

FIG. 6 is a graph showing an operation state of the vehicle braking performance measuring device of FIG. 1;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 vehicle braking performance measuring device 2 frame frame 3 front rotating roller 4 rear rotating roller 5 drive source 9 rotation detector 10 inclined plate 11 inclined plate 12 lift

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-214731 (JP, A) JP-A-4-24038 (JP, U) JP-B-57-56011 (JP, B2) JP-A-4-14738 1481 (JP, Y2) US Patent 3,455,153 (US, A) US Patent 3,277,703 (US, A) US Patent 3,383,909 (US, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01M 17/00 -17/007

Claims (3)

(57) [Claims] 1. A portable frame frame 2 installed on a floor surface of a maintenance shop or the like, and a wheel of a vehicle to be measured which is disposed parallel to the frame frame 2 with a proper distance therebetween. A pair of rotating rollers 3 and 4 before and after being placed, a driving source 5 installed in the frame 2 and driving the front rotating roller 3 to rotate;
An inclined plate 10, which is attached to the front and rear edges of the frame 2 perpendicular to the axial direction so as to be swingable or detachable.
And a 11, at the time of measurement, a four-frame frame 2 with arranging the rollers 3 of the forward front side is allowed to the four-wheel portion corresponding to the measurement target vehicle re four wheels, each framework At the front and rear edges of the body 2, the inclined plates 10, 1
A braking performance measuring device for a vehicle, characterized in that a slope is formed by 1 and a vehicle to be measured is carried in. 2. A portable frame frame 2 installed on a floor of a maintenance shop or the like, and a wheel of a vehicle to be measured which is disposed parallel to the frame frame 2 with a proper distance therebetween. A pair of rotating rollers 3 and 4 before and after being placed, a driving source 5 installed in the frame 2 and driving the front rotating roller 3 to rotate, and a rotating roller behind the frame 2 A rotation detector 9 for detecting rotation of 4;
Includes inclined plates 10 and 11 attached to the front and rear edges of a frame 2 perpendicular to the axial direction of the rotating rollers 3 and 4 so as to be swingable or detachable. Four frame frames 2 are arranged on the four wheel portions with the front rotating roller 3 on the front side, and the inclined plates 10 and 11 are provided on the front and rear edges of each frame frame 2. To form a slope,
A braking performance measuring device for a vehicle, wherein a vehicle to be measured is reloaded. 3. The vehicle according to claim 1, wherein a bar-shaped lift 12 for carrying out wheels of the vehicle to be measured is installed in a valley between the pair of front and rear rotating rollers 3 and 4. Braking performance measurement device.