JPH05238376A - Brake performance diagnosing device for vehicle - Google Patents

Abstract

PURPOSE:To provide a device which reproduces a road state in which a slip is easy to occur by arbitrarily regulating a friction force (a slip) between the wheel of a vehicle placed on rollers and the rollers. CONSTITUTION:A brake performance diagnosing device for a vehicle is formed such that wheels (a)-(d) of a vehicle V to be diagnosed are placed on paired rollers 2 and 4 at each of the front, the rear, the right, and the left. Brake operation of the vehicle V is performed as the rollers 2 and 4 are rotated togetherwith the wheels (a)-(d) of the vehicle V to diagnose brake performance. A main lift 12 to push up or lift the vehicle V to be diagnosed is arranged in the pit 1 of a floor F or on the floor F and sublifts 18 to independently push up the wheels (a)-(d) at the front and the rear of the vehicle V to be diagnosed are incorporated in the four corner parts of the upper frame of the main lift 12. A friction force (a slip) between the wheels (a)-(d) of the vehicle V to be diagnosed and the rollers 2 and 4 can be arbitrarily regulated by means of a plurality of sublifts 18. This constitution freely reproduces a road state in which a slip is easy to occur.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle braking performance diagnosing device, and more particularly to a slippery road surface condition by arbitrarily adjusting a frictional force (slip) between a vehicle wheel placed on a roller and the roller. The present invention relates to a device for freely reproducing.

[0002]

2. Description of the Related Art In recent high-class passenger cars and the like, in order to improve safety and operability, ABS (Attlock Lock) is used to prevent the brakes from being locked when sudden braking is applied on slippery roads. (Brake-system) and functions such as a traction control system that prevents wheel spin from occurring during sudden starts. Therefore, it is necessary to check whether these systems are functioning normally at the production stage or the maintenance stage.

[0003]

As a device for checking such a function, some devices and methods have been proposed in the past, but many of them are still incomplete. For example, a method in which the front and rear wheels of a test vehicle (vehicle to be diagnosed) are mounted on a pair of front and rear and left and right rotating wheels (rollers) driven by a motor to perform a brake operation to check the ABS function, and a method to be diagnosed A device has been proposed in which two wheels having different frictional forces are provided on a roller on which front and rear wheels of a vehicle are mounted, and which is rotated by a rotational force of the wheel to realize a pseudo slippery road surface. However, the method of (1) does not take into account the complicated friction that is seen on the actual road surface between the wheel and the rotating wheel, and the latter device realizes a pseudo slippery surface in actual operation. There was a problem that it was difficult to do.

That is, with the conventional method and apparatus, it is difficult to freely reproduce a slippery road surface state for each wheel of the test vehicle (vehicle to be diagnosed).

The present invention has been made in view of such a conventional situation, and freely adjusts the frictional force (slip) between a wheel of a vehicle mounted on a roller and the roller to freely slip. An object of the present invention is to provide a vehicle braking performance diagnosing device adapted to reproduce a road surface condition.

[0006]

The feature of the present invention lies in that the wheels of the vehicle to be diagnosed are mounted on a pair of front, rear, left, and right rollers, respectively, and the rollers are rotated together with the wheels of the vehicle. A braking performance diagnosing device for a vehicle for diagnosing braking performance by performing a braking operation of the vehicle, wherein a main lift for pushing up or lifting the vehicle to be diagnosed is provided in a pit on the floor or on the floor, and Sub lifts that independently push up the front and rear wheel portions of the vehicle to be diagnosed are incorporated in the four corners of the upper frame of the main lift, and the frictional force (sliding) between each wheel of the vehicle to be diagnosed and the rollers by the plurality of sub lifts. Can be adjusted arbitrarily, and if necessary, a load detector for detecting the push-up load of the sublift is installed in the sublift section, and the load detector The shipment weight data in braking performance diagnostic apparatus for a vehicle to estimate the frictional force between each wheel and the roller of the object to be diagnosed vehicle.

[0007]

Therefore, in the present invention, the frictional force between each wheel of the vehicle to be diagnosed and the roller can be adjusted arbitrarily, so that it is possible to freely reproduce the pseudo slippery road surface condition.
Further, by detecting the push-up load of the sub-lift portion by the load detector, it is possible to estimate and realize an arbitrary slipping road surface condition.

[0008]

1 to 5 show an embodiment of a vehicle braking performance diagnosing device according to the present invention. In the figure,
Reference numeral 1 denotes a pit formed on the floor surface F, and inside the pit 1, rollers, a main lift and a sub lift, which will be described later, are provided. That is, 2 is a pair of left and right front rollers located at the front, and the left and right of these front rollers 2 and 2 are connected via a universal joint 3. Reference numeral 4 denotes a pair of left and right rear rollers located rearward, and the left and right of these rear rollers 4 and 4 are connected via a universal joint 5. 6 is a third roller which is provided further behind the rear roller 4 and rotates in the same direction as the rear roller 4 by the rear wheel of the vehicle to be diagnosed V. The left and right of these third rollers 6 and 6 are also the universal joint 7 Are connected via.

The rollers 2, 4, 6 are
The frame 8 provided in the pit 1 as shown in FIG.
The front roller 2 and the rear roller 4 are provided so as to be synchronously interlocked with each other by a power transmission means 11 including a pulley 9 and a belt 10. Has been.

Next, 12 is a front roller 2 and a rear roller 4.
It is a main lift provided in the pit 1 so as to be located in the middle of. This main lift 12 is shown in FIGS.
As shown in FIG. 2, the lower frame 13 installed on the inner bottom surface of the pit 1 and the cylinders 15 a mounted on the right and left two positions of the standing frame 14 installed on the lower frame 13.
And an ascending / descending section 15 composed of a cylinder rod 15b, a rectangular upper frame 16 installed at an upper end of the cylinder rod 15b of the ascending / descending section 15, four bottom surface corners of the upper frame 16 and corresponding portions of the lower frame 13. It is provided with a cylinder 17a standing upright and a guide portion 17 composed of a guide rod 17b. Therefore, in the main lift 12, if the lifting / lowering portion 15 is driven, the upper frame 16 is moved by the vertical movement of the cylinder rod 15b.
It is possible to move up and down by being guided by 7 to move up and down the entire vehicle V to be diagnosed.

Reference numeral 18 denotes an upper frame 1 of the main lift 12.
It is a sub-lift built in the four corners of No. 6. As shown in FIGS. 4 to 5, the sub-lift 18 includes an elevating part 19 including a cylinder 19a fixed to the upper frame 16 and a cylinder rod 19b, and a load cell installed at an upper end of the cylinder rod 19b of the elevating part 19. The load detector 20 and the like, and an attachment 21 for receiving the vehicle body, which is composed of a rectangular plate or the like that is mounted on the load detector 20 in an exchangeable manner. Therefore, in the sub-lift 18, if the elevating part 19 is driven, the cylinder rod 19b
The attachment 21 is moved up and down via the load detector 20 by the vertical movement of the vehicle, and the corner portion of the vehicle body of the vehicle V to be diagnosed can be moved up and down. Furthermore, since the sub-lifts 18 at each of the four corners are independent of each other, it is possible to raise and lower any corner portion.

Reference numeral 22 denotes a vehicle V to be diagnosed mounted on rollers 2 and 4.
A plurality of vehicle clamps, four in this embodiment, are arranged on the left and right sides of the front and rear of the vehicle V to be diagnosed. As shown in FIG. 2, each of these vehicle clamps 22 has a fixed support column 23 standing upright on the floor F, and one end attached to the support column 23, while the other end is appropriately attached to the vehicle V to be diagnosed. It comprises a connecting belt, a chain or a rope 24.

Next, as shown in FIG. 3, 25 is attached to an appropriate portion of or around the vehicle to be diagnosed V,
Sensor rotors a ₁ , b ₁ , c ₁ , d ₁ respectively attached to the axles of the wheels a, b, c, d of the vehicle to be diagnosed V
Is a plurality of rotation speed detectors for detecting the rotation speed of the vehicle, and 26 receives signals from the rotation speed detectors 25 and diagnoses the ABS control unit 27 on the vehicle side and the braking performance of the vehicle. It is a signal distributor that sends signals to the diagnostic device main body 28. The signal distributor 26 is installed at an appropriate place around the vehicle to be diagnosed V. The diagnostic device body 28 is a central processing unit (CPU).
And is connected to the display 30 and the recorder 31 via the input / output interface 29.

Further, reference numeral 32 is an actuator for operating the brake cylinders 33a, 33b, 33c, 33d to release the hydraulic pressure applied to each of the brake cylinders 33a, 33b, 33c, 33d based on a control signal from the ABS control unit 27, and 34a, 34b, 34.
c, 34d are calipers, 35 is a master cylinder, 36
Is a brake pedal. Then, the detected load data from the four load detectors 20 is input to the diagnostic device main body 28 through, for example, the input / output interface 29,
It is set so that desired processing described later is performed.

The braking performance diagnosing device for a vehicle according to the present invention thus constructed is used in the following operating procedure. First, the vehicle to be diagnosed V is set to the rollers 2, 4, 6
The vehicle V and the vehicle clamp 22
To fix.

Next, in this state, the sub-lifts 18 at the four corners are driven to drive their upper limit strokes (about 150 m).
m)). After that, the main lift 12 is continuously driven to stop when the wheels a to d of the vehicle to be diagnosed V separate from the rollers 2, 4, and 6. Due to the separation of the wheels a to d, the total weight of the vehicle V to be diagnosed becomes 4 or more.
The individual sublifts 18 are loaded. This load can be detected by a load detector 20 such as a load cell incorporated in each sub-lift 18. Although the detected load data is the load data of the vehicle body portion close to the corresponding wheels a to d and is not the actual load on the actual wheels a to d, the actual load is sufficiently reflected. ..

The actual load on each of the wheels a to d can be calculated based on the load data detected by the load detector 20. For example, as the detected load data detected by the corresponding load detectors 20, the load value of the front left wheel a is W ₁ , the load value of the front right wheel b is W ₂ , and the load of the rear left wheel c is With the value W ₃ and the load value of the rear right wheel d being W ₄ , a calculation formula is obtained from the known weights and dimensions shown in FIG. 2, and if calculated, the actual load on the wheel portion of the vehicle V to be diagnosed is calculated. (Wheel weight)
Can be asked. However, in FIG. 2, W is the total weight of the vehicle V to be diagnosed, L is the distance between the front and rear wheels, L ₁ is the distance between the front wheel center and the vehicle center of gravity, and L ₂ is the distance between the rear wheel center and the vehicle center of gravity. , L is the distance in the front-rear direction between the sub-lifts, l ₁ is the distance between the center of the front sub-lift and the center of gravity of the vehicle,
l ₂ is the distance between the rear sublift center and the center of gravity of the vehicle, and S is the distance between the front wheel center and the front sublift center. In this calculation, the detected load data is input to the diagnostic device body 28 through the input / output interface 29 of FIG. 3 as described above, and the built-in CPU of the diagnostic device body 28 is input.
It may be carried out by.

Thereafter, each sub-lift 18 is driven to lower the corresponding attachment 21 so that the wheels a to d come into contact with the rollers 2, 4 and 6. At this time, the contact loads of the wheels a to d on the rollers 2, 4, and 6 are:
It can be arbitrarily adjusted by the vertical movement of each independent sub-lift 18. That is, the wheels a to d and the rollers 2 and 4
Since the frictional force (slip) with and can be set freely, the slippery road surface condition on the actual road surface can be freely reproduced. Further, by preparing some attachments 21 having different thicknesses and sizes in advance and exchanging them appropriately, it becomes possible to deal with various vehicle types and more delicate adjustments. This contact load is also
Further, it can be detected by the load detector 20, and the frictional force (slip) between the wheel and the roller can be easily estimated from the magnitude of the contact load.

After the frictional forces on the wheels a to d have been adjusted in this way, the engine of the vehicle V to be diagnosed is started and the wheels a to d are rotated until the speed reaches a certain level. Each roller 2, due to the rotational force of this wheel
4, 6 rotate synchronously. When the traveling speed of the vehicle V to be diagnosed reaches the diagnostic speed, a braking performance test such as braking the vehicle V to be diagnosed may be performed.

In this braking performance test, the wheels a to d are
If the frictional force is arbitrarily set in a part, that is, if a certain wheel is made slippery and the braking operation is started, a pseudo slippery road surface state is reproduced, so that the ABS braking performance operates properly. Whether or not the slippery wheels are locked can be diagnosed. This diagnosis may be performed by taking out the respective signals from the rotation speed detector 25 shown in FIG. 3 and inputting them to the diagnostic device main body 28 via the signal distributor 26.

In the above embodiment, the main lift 12
Need not necessarily be provided in the pit 1, but can be installed on the floor surface F. In this case, the vehicle to be diagnosed V
Should be lifted by a support arm. In the case of the above embodiment, the load detector 20 is the sub lift 1
The vehicle weight of each of the wheels a to d of the vehicle to be diagnosed V is determined in parallel with the vehicle 8 of the vehicle to be diagnosed. It is also possible to directly detect the load (wheel weight). Further, in the above embodiment, an example in which the ABS braking performance is diagnosed by reproducing a pseudo slippery road surface state between the wheels a to d and the rollers 2 and 4 has been described. The application range of the performance diagnostic device is not limited to this. For example, a slippery road surface condition is reproduced in a simulated manner, and it functions when suddenly starting from this condition,
It can also be used as a performance diagnostic device for a traction control system. Furthermore, in the above embodiment, the rollers 2, 4 and 6 were rotated by the rotational force of the wheels of the vehicle V to be diagnosed, but in the braking performance diagnosis apparatus of the present invention, the rollers are driven by a motor. It is also possible to do so.

[0022]

As is apparent from the above description, the braking performance diagnostic device for a vehicle according to the present invention has the following excellent effects. (1) Since the friction force between each wheel and the roller of the vehicle to be diagnosed can be arbitrarily adjusted by the main lift and the sub-lifts installed at the four corners of the upper frame, a pseudo slippery road surface condition can be freely reproduced. be able to. Therefore, various braking performance diagnostic tests such as ABS braking performance test and traction control system performance test can be performed. (2) When a load detector is installed in the sub-lift section, the frictional force between each wheel of the vehicle to be diagnosed and the roller can be easily estimated from the load data detected by this detector, and the road surface can be slipped quickly and appropriately. Status can be provided. (3) When the roller is rotated by the wheel rotational force of the vehicle to be diagnosed, a drive source such as a motor is not required, so that the cost of the device can be reduced. (4) Since the frictional force between this roller and the wheel of the vehicle to be diagnosed is adjusted by the vertical movement of the sub-lift as described above,
No special processing is required on the outer peripheral surface of the roller itself. (5) With such a method of adjusting the frictional force, once the vehicle to be diagnosed is placed on each roller, it is not necessary to move the roller thereafter and extremely good workability can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a vehicle braking performance diagnosing device according to the present invention.

2 is a partial vertical cross-sectional side view showing a braking performance diagnosing device for the vehicle of FIG. 1. FIG.

FIG. 3 is a schematic explanatory view showing a connection state of a vehicle braking performance diagnosing device of the present invention and an ABS electronic device system of a vehicle to be diagnosed.

FIG. 4 is a partially longitudinal enlarged side view showing a main lift and a sub-lift of the vehicle braking performance diagnosis device according to the present invention.

FIG. 5 is a plan view showing an upper frame of a main lift of the vehicle braking performance diagnosis device according to the present invention.

[Explanation of symbols]

 1 pit, 2 roller, 4 roller, 6 3rd roller, 8 frame, 12 main lift, 15 lifting part, 16 upper frame, 18 sub lift, 19 lifting part, 20 load detector, 22 vehicle clamp, 25 rpm detection Vessel, 27 ABS control unit, 28 diagnostic device main body, 29 input / output interface, V diagnostic vehicle, a to d wheels,

Claims (2)

[Claims] 1. A vehicle in which a wheel of a vehicle to be diagnosed is mounted on each pair of front, rear, left and right rollers, and the braking performance of the vehicle is diagnosed by performing a braking operation of the vehicle while rotating the roller together with the wheel of the vehicle. And a main lift for pushing up or lifting the vehicle to be diagnosed is provided in or on a floor pit, and the front and rear of the vehicle to be diagnosed are provided at four corners of an upper frame of the main lift. A sub-lift for independently pushing up each wheel portion of the vehicle is incorporated, and a frictional force (sliding) between each wheel of the vehicle to be diagnosed and the roller can be arbitrarily adjusted by the plurality of sub-lifts. Performance diagnostic device. 2. A load detector for detecting a push-up load of the sublift is installed in the sublift portion, and a frictional force between each wheel of the vehicle to be diagnosed and the roller is estimated based on load data detected by the load detector. The braking performance diagnosing device for a vehicle according to claim 1, wherein