Brake table slip rate measuring method

Abstract

The invention discloses a brake table slip rate measuring method, which comprises the following steps of: measuring the linear speed of a main roller of a brake table in real time by using a high-precision encoder, and controlling the linear speed of a third roller of the brake table to be consistent with the linear speed of the main roller through a driving and control integrated motor; after the linear speed of the main roller reaches a set value V0 and the main roller continuously rotates at V0, controlling the third roller to decelerate step by step through the driving and control integrated motor; in the speed reduction process, an alternating current mutual inductor is used for detecting whether a brake table driving motor stops or not, and a driving and control integrated motor reads the linear speed of a third roller in real time; when the brake table driving motor stops, the linear speed V1 of the third roller at the moment is recorded, and the slip rate of the brake table is calculated according to V0 and V1; and repeating the steps, and taking the average value of the slip rates of the brake table calculated for three times as the measured slip rate of the brake table. The invention provides a new solution for the slip rate measurement of the brake table, and has the advantages of higher precision, real-time monitoring and control capability and result stability.

Description

Technical Field

[0001] The invention relates to the field of brake platform detection, and in particular to a brake platform slip rate measurement method. Background Art

[0002] The brake rig is mainly composed of a roller device, a drive motor, a speed reduction mechanism, a measurement and control system, and a display instrument. It is an important measuring device for measuring the braking force of motor vehicle wheels. The slip rate is an important parameter for checking braking performance and grip performance. The JJG 906-2015 "Drum Reaction Brake rig" calibration procedure issued by the General Administration of Quality Supervision, Inspection and Quarantine states that for a brake rig with a third roller, the slip rate of its drive motor when it is stopped is one of the mandatory items for the first and subsequent calibrations.

[0003] In the existing brake platform slip rate measurement method, the commonly used technology includes using photoelectric sensors to measure the linear speed of the brake platform main roller and the third roller of the brake platform, and adding a support wheel between the brake platform main roller and the third roller of the brake platform to achieve the consistency of the linear speed of the two. However, the measurement accuracy of the photoelectric sensor is limited by its detection distance and may be affected by light, dirt interference or the surface flatness of the measured object, resulting in inaccuracy of the measurement result. If both the main roller and the third roller are measured using photoelectric sensors, the measured slip rate error is large. At the same time, the support wheel, as a transmission device connecting the main roller and the third roller, may cause inaccuracy in speed transmission due to wear, and there is a certain transmission delay in the support wheel transmission, that is, after the speed of the main roller changes, the speed of the third roller does not immediately follow the change. This transmission delay will cause the timeliness problem of the slip rate measurement, especially when the braking operation is frequent or the slip rate changes rapidly. Another problem with using the support wheel is that when the third roller of the brake platform is controlled to decelerate step by step, the support wheel needs to be manually removed, and after the support wheel is removed, it needs to be reinstalled for the next measurement, making the entire measurement process very cumbersome and inconvenient. Furthermore, existing methods often lack the ability to monitor and control in real time. Summary of the invention

[0004] The purpose of the present invention is to provide a brake platform slip rate measurement method to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0005] The present invention adopts the following technical solutions to achieve the above-mentioned invention object:

[0006] The present invention provides a brake platform slip rate measurement method, comprising:

[0007] Use a high-precision encoder to measure the linear speed of the main roller of the brake platform in real time, and control the linear speed of the third roller of the brake platform to keep it consistent with the linear speed of the main roller through the integrated drive and control motor;

[0008] After the linear speed of the main roller of the brake platform reaches the set value V0 and continues to rotate at V0, the third roller is controlled to decelerate step by step by the drive-control integrated motor;

[0009] During the deceleration process, an AC mutual inductor is used to detect whether the brake platform drive motor is stopped, and the drive-control integrated motor reads the linear speed of the third roller in real time;

[0010] When the brake platform driving motor stops, the linear velocity V1 of the third roller is recorded, and the brake platform slip rate is calculated based on V0 and V1;

[0011] Repeat the above steps and take the average of the brake platform slip rates calculated three times as the measured brake platform slip rate.

[0012] In one implementation, the high-precision encoder is used to measure the linear velocity of the main roller of the brake platform in real time, and the linear velocity of the third roller of the brake platform is controlled by driving and controlling the integrated motor to be consistent with the linear velocity of the main roller, including:

[0013] The high-precision encoder measures the position change of the main roller of the brake platform and converts it into an electrical signal, and calculates the linear speed of the main roller of the brake platform by counting the number of pulses output by the encoder;

[0014] The real-time measured linear velocity value of the main roller is used as the target speed setting value of the drive-control integrated motor, so as to keep the linear velocity of the third roller of the brake platform consistent with that of the main roller.

[0015] In one implementation, after the linear velocity of the main roller of the brake platform reaches the set value V0 and continues to rotate at V0, the third roller is controlled to decelerate step by step by driving the integrated motor, including:

[0016] The time during which the linear speed of the main drum of the brake platform continues to rotate is from the time when it reaches V0 to the time when the driving motor of the brake platform automatically stops;

[0017] After the linear speeds of the main roller and the third roller both reach V0, the third roller is gradually decelerated by driving and controlling the integrated motor.

[0018] In one implementation, the stepwise deceleration of the third roller by driving and controlling the integrated motor further includes:

[0019] Switching the control mode of the integrated drive-control motor, switching the control strategy from speed control to step-by-step deceleration control to achieve step-by-step deceleration of the third roller;

[0020] The step-by-step deceleration reduces the linear velocity of the main drum by one percent each time, and continues to run for 1 second after each deceleration.

[0021] In one implementation, during the deceleration process, an AC transformer is used to detect whether the brake platform drive motor is stopped, and the drive-control integrated motor reads the linear speed of the third roller in real time, including:

[0022] When the brake platform drive motor stops, its current value will change, and the AC transformer determines whether the brake platform drive motor stops by detecting and recording the current change waveform;

[0023] The drive-control integrated motor reads the pulse signal of its encoder in real time, and obtains the position change per unit time based on the count and time interval of the pulse signal, thereby calculating the linear speed of the third roller.

[0024] In one implementation, when the brake platform driving motor stops, the linear velocity V1 of the third roller is recorded, and the brake platform slip rate is calculated based on V0 and V1, including:

[0025] The brake platform slip rate is calculated from V0 and V1, and the formula is:

[0026]

[0027] Where: V1 is the linear velocity of the third roller when the brake station stops, V0 is the linear velocity of the main roller, ξ is the percentage of the difference between the linear velocity of the main roller and the linear velocity of the third roller and the linear velocity of the main roller at the moment when the brake station driving motor stops automatically;

[0028] The beneficial effects of the present invention are as follows:

[0029] The present invention realizes reliable measurement of the slip rate of the brake platform, and measures the main roller linear speed in real time through a high-precision encoder, thereby improving the measurement accuracy. The AC mutual inductor is used to detect whether the drive motor is stopped, and the linear speed of the third roller is recorded in real time, ensuring that accurate data is obtained at critical moments. At the same time, the average value is taken through multiple measurements, thereby improving the accuracy and stability of the measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A flow chart of a brake platform slip rate measurement method provided by an embodiment of the present invention; DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention is further described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The embodiment of the present invention provides a brake platform slip rate measurement method. When it is implemented, the present embodiment first uses a high-precision encoder to measure the linear velocity of the brake platform main roller in real time, and controls the linear velocity of the third roller of the brake platform to be consistent with the linear velocity of the main roller through the drive-control integrated motor. Then, after the linear velocity of the main roller of the brake platform reaches the set value V0 and continues to rotate at V0, the third roller is controlled by the drive-control integrated motor to decelerate step by step. Secondly, during the deceleration process, an AC mutual inductor is used to detect whether the brake platform drive motor is stopped, and the drive-control integrated motor reads the linear velocity of the third roller in real time. Subsequently, when the brake platform drive motor stops, the linear velocity V1 of the third roller at this time is recorded, and the brake platform slip rate is calculated by V0 and V1. Finally, the above steps are repeated, and the average value of the brake platform slip rate calculated three times is taken as the measured slip rate of the brake platform. The present invention measures the linear velocity of the main roller in real time through a high-precision encoder, provides a high-precision and accurate slip rate measurement result, eliminates errors and uncertainties that may exist in traditional measurement methods, and ensures the reliability of the measurement result.

[0032] Exemplary Methods

[0033] like Figure 1 As shown in , a brake platform slip rate measurement method of this embodiment includes the following steps:

[0034] Step S1, using a high-precision encoder to measure the linear velocity of the main roller of the brake platform in real time, and controlling the linear velocity of the third roller of the brake platform to be consistent with the linear velocity of the main roller by driving and controlling the integrated motor.

[0035] In this embodiment, when using a high-precision encoder, it should be ensured that the axis of the high-precision encoder is in the same straight line as the axis of the main roller of the brake platform to reduce measurement errors.

[0036] Specifically, the high-precision encoder measures the position change of the main roller of the brake platform and converts it into an electrical signal, and calculates the linear speed of the main roller of the brake platform by counting the number of pulses output by the encoder.

[0037] In addition, the real-time measured linear velocity value of the main roller is used as the target speed setting value of the drive-control integrated motor, so as to keep the linear velocity of the third roller of the brake platform consistent with that of the main roller.

[0038] Step S2: After the linear velocity of the main roller of the brake platform reaches the set value V0 and continues to rotate at V0, the third roller is controlled to decelerate step by step by driving the integrated motor.

[0039] The time for the main roller of the brake platform to rotate continuously should be from reaching V0 to the time when the brake platform driving motor automatically stops. After both the main roller linear speed and the third roller linear speed reach V0, the third roller is controlled to decelerate step by step through the integrated drive motor.

[0040] Specifically, the control mode of the integrated drive motor is switched, and the control strategy is switched from speed control to step-by-step deceleration control to achieve step-by-step deceleration of the third roller. The step-by-step deceleration reduces the linear speed of the main roller by 1% each time, and continues to run for 1 second after each deceleration.

[0041] Step S3: During the deceleration process, an AC mutual inductor is used to detect whether the brake platform drive motor is stopped, and the drive-control integrated motor reads the linear speed of the third roller in real time.

[0042] When the brake platform drive motor stops, its current value will change, and the AC transformer determines whether the brake platform drive motor stops by detecting and recording the current change waveform;

[0043] The drive-control integrated motor reads the pulse signal of its encoder in real time, and obtains the position change per unit time based on the count and time interval of the pulse signal, thereby calculating the linear speed of the third roller.

[0044] Step S4, when the brake platform driving motor stops, record the linear velocity V1 of the third roller at this time, and calculate the brake platform slip rate based on V0 and V1.

[0045] The brake platform slip rate is calculated from V0 and V1, and the formula is:

[0046]

[0047] Where: V1 is the linear velocity of the third roller when the brake station stops, V0 is the linear velocity of the main roller, ξ is the percentage of the difference between the linear velocity of the main roller and the linear velocity of the third roller and the linear velocity of the main roller at the moment when the brake station driving motor stops automatically;

[0048] Step S5, repeat the above steps, and take the average of the brake platform slip rates calculated three times as the measured brake platform slip rate;

[0049] It can be seen that the brake platform slip rate measurement method of this embodiment has the following differences compared with the existing method:

[0050] 1) A high-precision encoder is used to measure the linear speed of the main roller in real time. Compared with the existing method of using photoelectric sensors for measurement, the high-precision encoder has the advantages of high speed measurement accuracy, fast response speed, and no interference to the main roller of the brake platform during the measurement process.

[0051] 2) The third roller of the brake platform is directly controlled by the integrated drive and control motor to keep the linear speed consistent with the main roller of the brake platform. Compared with the existing method achieved by the wheel device, it has the advantages of real-time monitoring, fast following speed, convenient operation, and high speed following accuracy.

[0052] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for measuring a brake platform slip rate, characterized in that: include: Use a high-precision encoder to measure the linear speed of the main roller of the brake platform in real time, and control the linear speed of the third roller of the brake platform to keep it consistent with the linear speed of the main roller through the integrated drive and control motor; After the linear speed of the main roller of the brake platform reaches the set value V0 and continues to rotate at V0, the third roller is controlled to decelerate step by step by the drive-control integrated motor; During the deceleration process, an AC mutual inductor is used to detect whether the brake platform drive motor is stopped, and the drive-control integrated motor reads the linear speed of the third roller in real time; When the brake platform driving motor stops, the linear velocity V1 of the third roller is recorded, and the brake platform slip rate is calculated based on V0 and V1; Repeat the above steps and take the average of the brake platform slip rates calculated three times as the measured brake platform slip rate.

2. A brake platform slip rate measurement method according to claim 1, characterized in that: The method uses a high-precision encoder to measure the linear velocity of the main roller of the brake platform in real time, and controls the linear velocity of the third roller of the brake platform to be consistent with the linear velocity of the main roller through the drive-control integrated motor, including: The high-precision encoder measures the position change of the main roller of the brake platform and converts it into an electrical signal, and calculates the linear speed of the main roller of the brake platform by counting the number of pulses output by the encoder; The real-time measured linear velocity value of the main roller is used as the target speed setting value of the drive-control integrated motor, so as to keep the linear velocity of the third roller of the brake platform consistent with that of the main roller.

3. A brake platform slip rate measurement method according to claim 2, characterized in that: After the linear speed of the main roller of the brake platform reaches the set value V0 and continues to rotate at V0, the third roller is controlled to decelerate step by step by driving and controlling the integrated motor, including: The time for the main roller linear speed of the brake platform to rotate continuously starts from reaching V0 and lasts until the brake platform driving motor automatically stops; after the linear speeds of the main roller and the third roller both reach V0, the third roller is controlled to decelerate step by step through the drive-control integrated motor.

4. A brake platform slip rate measurement method according to claim 3, characterized in that: The third roller is controlled to reduce speed step by step by driving and controlling the integrated motor, and further comprising: Switching the control mode of the integrated drive-control motor, switching the control strategy from speed control to step-by-step deceleration control to achieve step-by-step deceleration of the third roller; The step-by-step deceleration reduces the linear velocity of the main drum by one percent each time, and continues to run for 1 second after each deceleration.

5. A brake platform slip rate measurement method according to claim 4, characterized in that: During the deceleration process, an AC mutual inductor is used to detect whether the brake platform drive motor is stopped, and the drive-control integrated motor reads the linear speed of the third roller in real time, including: when the brake platform drive motor is stopped, its current value will change, and the AC mutual inductor determines whether the brake platform drive motor is stopped by detecting and recording the current change waveform; The drive-control integrated motor reads the pulse signal of its encoder in real time, and obtains the position change per unit time based on the count and time interval of the pulse signal, thereby calculating the linear speed of the third roller.

6. A brake platform slip rate measurement method according to claim 5, characterized in that: When the brake platform driving motor stops, the linear velocity V1 of the third roller is recorded, and the brake platform slip rate is calculated based on V0 and V1, including: The brake platform slip rate is calculated from V0 and V1, and the formula is: Wherein: V1 is the linear velocity value of the third roller when the brake platform stops, V0 is the linear velocity value of the main roller, ξ is the difference between the linear velocity of the main roller and the linear velocity of the third roller at the moment when the brake platform driving motor stops automatically and the percentage of the linear velocity of the main roller.

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