JP3347672B2 - ABS function inspection method for brake tester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ABS function inspection method for a brake tester having an ABS inspection function, the ABS function inspection being improved.

[0002] The present applicant has already disclosed a pair of front and rear rotating rollers appropriately arranged as a brake tester with an ABS inspection function, a power transmission mechanism connected between the rotating shafts of the two rotating rollers, and A drive source for transmitting torque to the power transmission mechanism, a torque or braking force detector interposed between the drive source and the power transmission mechanism, a rotation shaft of the rear rotating roller, and the power transmission mechanism A clutch mechanism interposed therebetween and a rotation speed detector for detecting the rotation speed of the rear rotation roller (Japanese Patent Application No. 09-017887).
No.) has been proposed.

In this brake tester with an ABS inspection function, the wheel of the vehicle to be measured is rolled and mounted between a pair of rotating rollers, a rear rotating roller is set in a free state by a clutch mechanism, and a front driving source is driven by a rear driving source. By rotating the rotating roller at a certain speed or more, braking the measured vehicle in this state, and detecting the rotating speed of the rear rotating roller at this time, the ABS function of the measured vehicle operates properly. It is to check whether or not. More specifically, the number of rotations of the rear rotating roller is continuously monitored for a certain period of time, and it is confirmed that the number of rotations exceeds a predetermined number and a predetermined number of rotations (band) within a predetermined time. If
It is determined that the ABS function is operating normally.

[0004]

However, an ABS function for detecting that the number of rotations of the rear rotating roller has changed more than a predetermined number of times or more than a predetermined number of rotations within a specified time period. In the inspection, there was a concern that special cases could not be handled well.

(1) First, the above-mentioned brake tester with an ABS inspection function takes a form having at least two (two sets) of a pair of front and rear rotating rollers when inspecting the ABS function of the vehicle to be measured. Front left and right wheels,
Alternatively, the rear left and right wheels are rolled and mounted on the pair of front and rear rotating rollers, and the left and right wheels are inspected. At this time, for example, as shown in FIG. rotational speed of the rollers of the rear corresponding to the respective wheel (speed) N _R, as N _L, to monitor continuously a certain time, the number of more than the default value to the specified time t ₁ ~t in ₂ (for example, several times ), It is determined that the ABS function of the vehicle to be measured is operating normally due to a change in the rotation speed range (V _{1 to} V ₂ ) or more.

However, the rotation speeds N _R and N _{L of} the rear rotating rollers corresponding to the left and right wheels of the vehicle to be measured are always shown in FIG.
As shown in FIG. 4, it was found that almost the same rotation pattern (fluctuation pattern) was not taken, but a rotation pattern (fluctuation pattern) was taken as shown in FIG. In this case, for example, the rotation speed N _R of the right wheel does not change beyond a predetermined rotation speed range (V _{1 to} V ₂ ), which is a condition for judging acceptance, and the ABS function of the measured vehicle operates normally. If not, it will be determined.

However, in the vehicle to be measured, for various reasons, even if the ABS function can be operated normally, the rotation speed N of the rear rotating roller corresponding to each of the left and right wheels of the vehicle to be measured. The rotation pattern of _R and _NL may vary.

For example, one of the reasons is that there is a variation between the left and right wheel bases of the vehicle to be measured. For example, when the front left and right wheels are rolled and mounted on a pair of front and rear rotating rollers. In the case where the right and left wheels cannot roll against the corresponding rear rotating rollers with uniform rolling contact force (adhesion force), for example, when the rolling contact force of the right wheel is small, FIG. Such a rotation pattern N _R appears. Another reason is that, depending on the target vehicle to be measured, the ABS corresponding to each wheel is different.
When the unit is incorporated (the left and right wheels on the rear side may be shared by one ABS unit), the ABS unit itself has variations, and each of the left and right wheels is also In some cases, the rotation speed of the rear-side rotating roller corresponding to the above may vary.

(2) Next, depending on the ABS system of the measured vehicle, if all the wheels are decelerated at the same deceleration at the time of braking, the assumed vehicle speed to be a reference and the speed of each wheel match. It has been found that the ABS function does not operate even if each wheel is locked as it is.

That is, at the time of braking of the ABS, the speed of each wheel is detected, and from these speeds, an assumed vehicle speed to be used as a reference is calculated from, for example, the speed of the fastest wheel. From the comparison with, the slow speed wheel is
In an ABS system in which the lock is released as a wheel in a locked state, if all the wheels are decelerated at the same deceleration, the difference between the assumed vehicle speed and the speed of each wheel almost disappears. The vehicle speed cannot be obtained and AB
A situation occurs in which the S function does not operate normally. For example, as shown in FIG. 5, when the left and right wheels on the front side are decelerated at the same deceleration, the speeds of the left and right wheels, that is, the rotation speeds N _R and N _{L of the} rotating rollers become substantially the same, and the assumed vehicle Since there is almost no difference between the speed and the speed of each wheel, AB
The S function does not operate, and each wheel comes to a locked state. Also in this case, it is determined that the ABS function of the measured vehicle is not normally operating even if the ABS function can operate normally.

The present invention has been made in view of such circumstances, and when checking the pass / fail of the ABS function, the rotation speed of the rear rotation roller corresponding to each wheel has changed by a predetermined rotation speed width or more. Instead of uniformly determining whether or not the rotation speed of the rotating roller in a predetermined period is reduced
Negative rate of change and positive rate of change as speed is increased
Repeatedly to capture and, also, by providing a speed difference of at least 2 or more of the wheels or the axles, even if they are decelerated at the same deceleration, acceptance of the ABS function has to be properly determined An ABS function inspection method for a brake tester is not provided.

[0012]

According to the first aspect of the present invention, a pair of rotating rollers before and after the wheels of the vehicle to be measured are placed in rolling contact with each other are appropriately separated from each other, and these rotating rollers have a certain speed. An ABS function test using a brake tester that can apply a brake to the measured vehicle in the above-mentioned rotating state and detect the number of rotations of the rear rotating roller of the pair of rotating rollers at this time. a method, rotation of the rollers of the rear at the time of braking of the measured vehicle
The speed is reduced and the speed is increased with a negative rate of change
An ABS function test in a brake tester , which catches repetition of a positive change rate and compares these change rates with a previously assumed change pattern to determine whether the ABS function of the measured vehicle is acceptable or not. In the way.

According to a second aspect of the present invention, at least two or more of the pair of front and rear rotating rollers are provided, and when the pair of rotating rollers are rotated by a driving source, at least two or more of the at least two vehicles of the vehicle to be measured are set in advance. 2. The method according to claim 1, wherein a speed difference is provided between the wheels or the respective axles, and the measured vehicle is braked in this state.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an AB for implementing an ABS function inspection method in a brake tester according to the present invention.
1 shows an example of a brake tester with an S inspection function. In the drawing, reference numerals 1 and 2 denote a pair of front and rear rotating rollers which are appropriately separated from each other, 3 denotes a power transmission mechanism provided continuously between the rotation shafts 1a and 2a, and 4 denotes a power transmission mechanism to the power transmission mechanism 3. 5 is a torque or braking force detector interposed between the drive source 4 and the power transmission mechanism 3, and 6 is, for example, a connection side of the rear rotation roller 2 to the power transmission mechanism 3. A rotation speed detector 7 which is attached to the rotation shaft 2a on the opposite side (can also be attached to the power transmission mechanism 3 side) and comprises a tachometer generator or a pulse encoder for detecting the rotation speed, 7 This is a clutch mechanism interposed between the rear rotating roller 2 and the power transmission mechanism 3. In this device system, at least two pairs of front and rear rotating rollers 1 and 2 are provided, and preferably four are used side by side as shown in the figure.

In this brake tester with an ABS inspection function, first, wheels 100 (four wheels) of a vehicle to be measured are rolled and mounted between a pair of four front and rear rotating rollers 1 and 2. Of course, two pairs of front and rear rotating rollers 1 and 2 may be used to roll and mount the front left and right wheels or the rear left and right wheels of the measured vehicle. And with this device,
When a normal brake test is performed, the clutch mechanism 7 is connected, the drive source 4 is driven, and the pair of front and rear rotation rollers 1 and 2 are rotated via the power transmission mechanism 3. In this state, if the driver of the vehicle under test applies the brake, the braking torque or the braking force is detected by the detector 5, and the detected value is regarded as the degree of the braking force, so that the so-called braking performance can be determined.

Next, when the ABS function is checked,
The clutch mechanism 7 is disengaged so that only the front rotating roller 1 can be driven. However, in this case, since the rotation of the front rotation roller 1 is transmitted to the rear rotation roller 2 via the wheels 100, the rear rotation roller 2 also follows the rotation. In this state,
When the driver of the vehicle under test applies the brake and the ABS function is activated, the braking force is temporarily reduced when the wheel 100 approaches the locked state, whereby the rotation speed (speed) of the wheel 100, that is, the rear rotation When the rotational speed of the roller recovers, the increase and decrease of the rotational speed are repeated such that the braking force is increased again.

Therefore, as shown in FIG.
For example the rotational speed (speed) N _R of the rotary roller on the rear side corresponding to the left and right wheels, as N _L, detected by the rotational speed detector 6, the rotating pattern monitoring continues (variation pattern) for a predetermined time and, the specified time t ₁ ~t number than the default value in ₂ (for example, several times), the default number of revolutions width (V ₁ ~
If changes V ₂₎ above, the ABS function of the measured vehicle is operating normally, it can be determined.

When the ABS function is operated, if the braking force of the brake is large, a slip may normally occur between the wheel 100 and the roller. In the case of the brake tester with the ABS inspection function, the front rotating roller Only the rotation roller 1 is driven by the drive source 4 and the rear rotation roller 2 is separated by the clutch mechanism 7 and is driven to rotate by the rotation of the wheel 100, thereby causing a slip. There is almost no fear and the rotation speed detector 6 can always faithfully reproduce the rotation speed of the wheel 100.

However, in the brake tester with the ABS inspection function, if there is a variation between the left and right wheel bases of the vehicle to be measured, or if there is a variation in the ABS unit of each wheel, for example, the front right wheel for, as shown in FIG. 4 described above, the rotational speed N _R
Will appear as a rotation pattern.

[0020] In the present invention (the invention according to claim 1), for this case, the rotation pattern N _R, specified time t ₁ ~t ₂
Number of more than the default value within the default rotation speed width (V ₁ ~V ₂₎
Due to the above change, the rate of change of the rotation pattern of the right wheel during a predetermined period is determined instead of determining that the ABS function of the measured vehicle is operating normally.

When the rotation pattern N _R of the right wheel is captured by a change rate, a negative change rate at which the rotational speed is reduced and a positive change rate at which the rotational speed is increased appear repeatedly. although not changed default rotational speed width (V ₁ ~V ₂₎ above, the wheel side, it can be seen that the brake and the release are repeated. In particular, when paying attention to the maximum value, this change rate substantially coincides with a previously assumed fluctuation pattern (rotation pattern) in which it is determined that the ABS function of the measured vehicle is operating normally. . Therefore, even in such a case, in the present invention, it can be determined that the ABS function of the measured vehicle is operating normally.

Therefore, the number of rotations of the rear rotating roller corresponding to each wheel changes more than a predetermined number of times and a predetermined number of rotations width (V ₁ -V ₂ ) within the specified time t ₁ -t ₂ . When uniformly determining whether or not the ABS function is performed, if the ABS function is not operating normally, it is possible to appropriately determine what should be erroneously determined.

On the other hand, another invention of the present invention (the invention according to claim 2)
Then, as shown in FIG. 2, when inspecting the ABS function, the clutch mechanism 7 is disengaged and, for example, the driving sources corresponding to the rotational speeds (speeds) of the front left and right wheels, respectively. The rotation speeds of the rollers 4 and 4 are controlled, and a speed difference is provided from the beginning to rotate each of the rotation rollers 1 and 1 on the front side.

Then, as described above, at the time of braking of the ABS, the speeds of the respective wheels are detected, and from these speeds, an assumed vehicle speed to be used as a reference is calculated from, for example, the speed of the fastest wheel. From the comparison between the speed of each wheel and the speed of each wheel, in the vehicle under measurement adopting the ABS system in which the wheel of the lower speed is unlocked as the wheel in the locked state, the driving of the vehicle under measurement in this state When the driver applies the brakes, even if the left and right wheels on the front side are decelerated at the same deceleration, there is a difference in speed between the left and right wheels on the front side from the beginning, so the assumed vehicle speed to be the reference is properly calculated. The left and right wheels do not reach the locked state, and as shown in the figure, when the rotation speed of each wheel recovers, the braking force is increased again. It so is possible to easily determine that motion.

[0025]

As is clear from the above description, the following excellent effects can be obtained by the method of testing the ABS function in the brake tester according to the present invention.

First, according to the first aspect of the present invention, there is a variation between the left and right wheel bases of the measured vehicle,
Alternatively, even if the ABS unit of each wheel varies, the rotation speed of the rotation roller in a predetermined period of the rotation speed of the rear rotation roller corresponding to each wheel is reduced.
Negative rate of change and positive rate of change as speed is increased
This is a method of capturing the repetition of the above, so that it is possible to appropriately determine that the ABS function is operating normally.

Next, according to the second aspect of the present invention, since each wheel of the vehicle to be measured is rotated with a speed difference from the beginning, even if each wheel is decelerated at the same deceleration, the ABS is maintained.
It is possible to properly determine that the function is operating normally.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing an example of a brake tester with an ABS inspection function for performing an ABS function inspection method in a brake tester according to the present invention.

FIG. 2 is a graph showing the relationship between the number of rotations of a rear rotating roller corresponding to a wheel and an elapsed time, which is an example of an ABS function inspection method in a brake tester according to the present invention.

FIG. 3 is a graph showing a relationship between the number of rotations of a rear rotating roller corresponding to a wheel and an elapsed time in a brake tester with an ABS inspection function.

FIG. 4 is a graph showing a relationship between the number of rotations of a rear rotating roller corresponding to a wheel and an elapsed time in a brake tester with an ABS inspection function.

FIG. 5 is a graph showing a relationship between the number of rotations of a rear rotating roller corresponding to a wheel and an elapsed time in a brake tester with an ABS inspection function.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 front rotation roller 1a rotation shaft 2 rear rotation roller 2a rotation shaft 3 power transmission mechanism 4 drive source 5 detector for torque or braking force 6 rotation speed detector 7 clutch mechanism 100 wheels N _R , N _L wheels Number of rotations (number of rotations of rear rotating roller)

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01M 17/007 B60T 8/32

Claims (2)

(57) [Claims] A pair of front and rear rotating rollers on which the wheels of a vehicle to be measured are rolled and mounted are appropriately spaced apart from each other, and the rotating rollers are rotated at a certain speed or higher. An ABS function inspection method using a brake tester capable of operating braking and detecting a rotation speed of a rear rotation roller of the pair of rotation rollers at this time. The negative change rate and the number of revolutions at which the number of revolutions of the rear rotating roller is reduced are
Capturing the repetition with a positive rate of change
By comparing these rates of change with the fluctuation pattern assumed in advance,
An ABS function inspection method for a brake tester, comprising determining whether or not the ABS function of the measured vehicle is acceptable. 2. When there are at least two pairs of front and rear rotating rollers, and when the pair of rotating rollers are rotated by a drive source, a speed difference is previously determined between at least two or more wheels or axles of the vehicle to be measured. 2. An ABS function inspection method for a brake tester according to claim 1, wherein braking is applied to the vehicle under measurement in this state.