JPH0813635B2 - Measuring method of vehicle braking performance - Google Patents

Description

The present invention relates to a method for measuring the braking performance of a vehicle, and more particularly to a method for measuring the braking performance of a vehicle, in particular, controlling the brake lock of front and rear wheels according to the braking state while changing the vehicle during braking. The present invention relates to a vehicle braking performance measuring method that incorporates a so-called anti-skid brake control mechanism (hereinafter referred to as ABS), which prevents the vehicle from moving forward and ensures vehicle stability and steerability during sudden braking.

"Prior Art" Conventionally, a front wheel speed sensor for detecting a front wheel speed, a rear wheel speed sensor for detecting a rear wheel speed, a switch means for sending a brake signal to a computer, and a selected computer An actuator that controls the hydraulic pressure supplied to the brake cylinder etc. based on the control signal is provided, and an appropriate braking force according to the vehicle speed and the condition of the road surface is provided on the computer side based on the wheel speed signal from each sensor. As shown in FIG. 3, the wheel speed RS drops significantly with respect to the wheel speed CS while transmitting a control signal for obtaining to the actuator and adjusting the mode of the actuator based on the control signal. If the wheel speed RS was close to the vehicle speed CS, the hydraulic pressure supplied to the brake cylinder, etc. was reduced to reduce the braking force. If the ABS system to obtain an optimum braking operation while repeating the operation such as increasing the braking force boosts the hydraulic pressure supplied to the brake cylinder or the like are known.

Vehicles incorporating such an ABS system are expected to spread rapidly in the fields of large-sized vehicles and luxury vehicles in particular, and therefore brakes for determining whether or not the ABS system is operating smoothly. There was a strong demand for the development of a measurement method, but in the ABS system, the ABS system must be a measurement method that can artificially restore the drop situation of the wheel speed RS corresponding to the road surface condition with respect to the vehicle speed CS. It is impossible to determine whether it is operating smoothly.

"Problems to be Solved by the Invention" For example, as a conventional brake measuring method, as shown in FIG. 4, for example, a pair of rotating wheels 1 and 2 arranged in parallel are arranged at positions corresponding to tire mounting positions, respectively. The rotating wheel 1,
The tires 3 are arranged so as to be orthogonal to each other on two pairs, and the motor 4 is attached to one of the pair of the rotating wheels 1 and 2.
To form a drive wheel, and a pulse meter 5 for detecting the rotation speed is provided on the other end side of the drive wheel or the driven wheel to configure a brake tester, and in order to perform brake measurement in such a device, first, After rotating the tire 3 at a high speed at a predetermined speed or higher through the driving wheels by the motor 4,
A method of detecting the wheel rotation speed, which fluctuates and attenuates by the ABS system according to the braking state of the motor 4 at the same time as the rotation of the motor 4 is stopped, by the driving wheel or the driven wheel, is detected. Had adopted.

The decay curve of the rotation speed is as shown in FIG. 2 (a), and the operating condition of the ABS system can be checked for a while. However, in the measuring method described above, the rotation of the motor 4 is changed after the brake is depressed. It means that the ABS system operation is being measured in a state where is stopped, in other words, in a free state.

However, in actual running of the wheels, in order to perform braking operation while always receiving load resistance from the road surface side, when measuring the operation of the ABS system in the free state as described above, a situation different from the actual road surface situation Since the braking operation is measured with, it is difficult to determine whether the ABS system is operating correctly and inevitably, misjudgment is easy.

Further, in the known braking operation measuring system, for example, a torque meter is connected between the motor and the driving wheel, and a belt is interposed between the driving wheel and the driven wheel so that they rotate at the same speed, First, in an unrestrained state,
After rotating the drive wheels and driven wheels by the motive force of the vehicle itself, stop the motive force of the vehicle itself and activate the brakes,
At the same time, by starting the motor and driving the driving wheel and the driven wheel at the same time, while causing a load resistance to the tire to which the braking force is applied, while detecting the torque fluctuation that occurs between the two with the torque meter, There are methods for measuring the braking operation status of a vehicle. (Actual exploitation 55-170647
However, in the configuration in which the motor is started at the same time as the braking operation as described above, the motor is started while the tire is rotating, so the load resistance between the rotating wheel and the tire at the initial stage of starting the motor is large. If the load is applied to the motor and the motor is started, the time required for the motor to shift to the steady state becomes long, and the above-mentioned drawbacks are further promoted. Even if the braking operation is measured with, the accuracy of the measurement is questionable, and the operating state of the ABS system cannot be accurately determined.

The present invention has been made in view of the above drawbacks of the prior art, and an object of the present invention is to provide a vehicle braking performance measuring method capable of accurately determining the operating state of an ABS system.

"Means for Solving Problems" The present invention proposes a vehicle braking performance measuring method capable of accurately determining the operating state of an ABS system based on the following procedure.

A pair of rotating wheels 1 and 2 arranged in parallel are arranged at a position corresponding to the mounting position of the tire 3 of the vehicle, and the pair of rotating wheels 1 and 2 are respectively arranged.
2. Install tire 3 on top.

Next, at least one rotating wheel 1 is driven with the tire 3 installed, and the tire 3 installed on the rotating wheel pair 1 and 2 is rotated at a high speed, for example, around 30 to 60 km / h.

After the rotational speed of the tire 3 shifts to a steady state, the braking operation is started while the driving rotation of the rotating wheels 1 and 2 is maintained.

After the start of the braking operation, the torque meter 6 or other detector detects a torque or load fluctuation generated between the tire 3 and the driving rotary wheels 1 and 2 according to the braking state of the brake.

[Operation] According to the technical means, in the state where the driving rotation of the rotating wheel 1 is maintained, in other words, the load resistance is always received from the rotating wheels 1 and 2 side corresponding to the road surface, as in the actual traveling of the vehicle. However, since the measurement is possible, it is possible to measure the braking performance corresponding to the actual road surface condition.

Further, the drive rotation of the rotary wheel 1 is not performed after the braking operation is started as in the prior art, but conversely, the rotary wheel 1 is driven in advance and installed on the rotary wheel pair 1 and 2. In order to start the braking operation at the stage when the tire 3 shifts to the high speed and steady rotation operation, the braking performance according to the actual actual road surface condition can be measured without changing the load resistance between the rotating wheel 1 and the tire 3. I can.

Therefore, the braking operation status of the vehicle controlled by the anti-skid brake control mechanism can be measured with high accuracy only by the technical means.

The actual road surface may have load fluctuations during braking due to the presence of water pools, but by changing the rotation speed of the rotary wheel 1 after the start of the braking operation,
Such a road surface condition can also be realized in a pseudo manner.

[Embodiment] Hereinafter, a preferred embodiment of the present invention will be exemplarily described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative positions, etc. of the constituent parts described in this embodiment are not intended to limit the scope of the present invention thereto only unless there is a particularly stable description, and are merely illustrative examples. Nothing more than.

FIG. 1 shows a measuring device according to an embodiment of the present invention. To schematically explain the structure thereof, a pair of rotating wheels 1 arranged in parallel are arranged at positions corresponding to the tire 3 mounting device, respectively. A tire 3 is arranged on the pair of rotating wheels 1 and 2 so as to be orthogonal to each other, and one of the pair of rotating wheels 1 and 2 is connected to a motor 4 via a torque meter 6. The driving wheel 1 is formed and the other side is formed as a non-restrained driven wheel 2.

The driven wheel 2 may be connected to the drive wheel 1 via a belt so that both rotary wheels 1 can rotate at the same speed.

Further, a pulse meter 5 for detecting the rotation speed is provided on the other end side of the driving wheel 1 or the driven wheel 2.

 Next, the operation of this embodiment will be described.

First, after installing the tire 3 on the rotating wheel pair 1 and 2, respectively, the motor 4 is driven to rotate the drive wheel 1, and the tire 3 installed on the rotating wheel pair 1 and 2 is, for example, 30 to 60 km. After a high speed rotation around / h and confirming that the rotation speed of the tire 3 has shifted to a steady state by the pulse meter 5, the brake operation is started while the driving rotation of the motor 4 is maintained.

After the start of the braking operation, a torque meter 6 connected between the motor 4 and the driving wheel 1 detects a torque fluctuation generated between the tire 3 and the driving wheel 1 in accordance with the control state of the brake, and the torque fluctuation As shown in FIG. 2 (b), it is determined whether or not the anti-skid brake control mechanism is operating normally by measuring in time series.

[Advantages of the Invention] As described above, according to the present invention, the
It is possible to realize a vehicle braking performance measurement method that can accurately determine the operating state of the S system, and its practical value is extremely large.

[Brief description of drawings]

1 and 4 are schematic diagrams showing a vehicle braking performance measuring device applied to the present invention and the prior art, respectively, and FIG. 3 is an operation diagram showing braking performance based on such a device. FIGS. 2A and 2B are graphs showing the relationship between the wheel speed and the vehicle speed due to the anti-skid brake.

Claims (1)

[Claims] 1. A tire mounted on a pair of rotating wheels is rotated at a high speed by driving at least one rotating wheel of a pair of rotating wheels arranged in parallel, and the rotating speed shifts to a steady state. After that, the brake operation is started in a state where the driving rotation of the rotating shaft is maintained, and the load fluctuation or the change in the rotation speed generated between the tire and the driving rotating wheel is detected by the detector according to the braking state of the brake. A method for measuring braking performance of a vehicle, characterized in that the braking operation state of the vehicle controlled by the anti-skid brake control mechanism is measured.