The ABS brake pad detection data is inaccurate. Is it a sensor fault or an error in system parameter settings?

The inaccurate detection data of ABS brake bench, sensor faults, and incorrect system parameter settings may be the key reasons. In addition, there are other factors that can also cause deviations in the detection data. The following is a detailed analysis for you:

1,Sensor fault
① Sensor damage
Reason: The sensors of ABS brake pads are exposed to complex working environments such as high temperature, humidity, vibration, etc. for a long time, which may cause damage to the electronic components inside the sensors. For example, the induction coil of the wheel speed sensor may break due to vibration, or the sensor chip may burn out due to high temperature. In addition, sensors can also be damaged by external forces such as impact and corrosion.
Performance: The detection data may exhibit abnormal fluctuations, numerical jumps, or no signal output at all. For example, when the wheel speed sensor is damaged, the corresponding wheel speed data may display as zero or a fixed error value, or the data may fluctuate significantly in a short period of time, causing the ABS brake station to be unable to accurately calculate the braking performance parameters.
②Improper installation of sensors
Reason: If the installation position of the sensor is not accurate, it will affect its accurate acquisition of signals. For example, if the gap between the wheel speed sensor and the ring gear is too large or too small, it will cause the sensing signal to weaken or become unstable. In addition, incorrect installation angles of sensors may also result in inaccurate signals being collected.
Performance: There may be deviations in the detection data that do not match the actual situation. For example, the wheel speed data may be higher or lower than the actual speed, resulting in incorrect calculation of parameters such as braking distance and braking deceleration. By checking the installation position and clearance of the sensor, improper installation issues can be identified.
③ Sensor contamination
Reason: If the surface of the sensor is covered with pollutants such as dust, oil, and iron filings, it will affect its sensing performance. For example, if the sensing head of the wheel speed sensor is adsorbed by iron filings, it will interfere with its sensing of the ring gear tooth top and valley, resulting in inaccurate signal acquisition.
Performance: The detection data may fluctuate or be inaccurate. For example, there may be intermittent erroneous values in the wheel speed data, or the stability of the data may deteriorate. After cleaning the sensor surface, the detection data may return to normal.

2,System parameter setting error
①Incorrect vehicle parameter settings
Reason: When using an ABS brake bench for testing, it is necessary to input relevant parameters of the vehicle, such as vehicle type, tire specifications, wheelbase, etc. If these parameters are set incorrectly, it will lead to inaccurate calculation models of the brake table, resulting in deviations in the detection data. For example, if the input tire specifications do not match the actual tire specifications, it will affect the calculation of wheel circumference, which in turn will affect the calculation of wheel speed and braking distance.
Performance: There are significant differences between the detection data and the actual situation, and there may be unreasonable consistency errors in the detection data of different vehicles. For example, when multiple vehicles of different specifications are tested on the brake bench, the braking distance and other parameters obtained are very close, which may be due to incorrect vehicle parameter settings.
②Error in setting standard parameters for detection
Reason: The testing standard parameters for ABS brake pads, such as the qualified range of braking deceleration and the standard value of braking distance, need to be set according to relevant regulations and standards. If these parameters are set incorrectly, it can lead to misjudgment of the detection results. For example, setting the lower limit of qualified braking deceleration too low may result in some vehicles with unsatisfactory braking performance passing the inspection.
Performance: There may be a large number of qualified or unqualified vehicles that do not match the actual situation in the test results. By checking the settings of the detection standard parameters, the problem of incorrect parameter settings can be discovered.
③ System compensation parameter setting error
Reason: In order to improve detection accuracy, ABS brake pads usually set some compensation parameters, such as temperature compensation, humidity compensation, etc. If these compensation parameters are set incorrectly, it can lead to inaccurate detection data due to environmental factors. For example, if the temperature compensation parameters are set improperly, the detection data may deviate when the ambient temperature changes.
Performance: The detection data may exhibit unreasonable fluctuations with changes in environmental factors. For example, in the case of significant temperature changes, there may be significant differences in the detection data of the same vehicle, which may be due to incorrect temperature compensation parameter settings.

3,Other factors
①Wear and tear of mechanical components
Reason: The mechanical components of ABS brake pads, such as rollers, chains, gears, etc., may experience wear and tear after long-term use. The wear and tear of these components can affect the transmission accuracy and stability of the brake platform, resulting in inaccurate detection data. For example, surface wear on the drum can cause changes in the friction between the wheel and the drum, affecting the measurement of wheel speed.
Performance: The detection data may fluctuate or deviate, and the accuracy of the data will gradually decrease with the increase of usage time. By checking the wear of mechanical components, the impact of wear on the detection data can be discovered.
②Electrical interference
Reason: The electrical system of the ABS brake station may be subject to electromagnetic interference from the surrounding environment, such as nearby motors, transformers, radio equipment, etc. These electromagnetic interferences can affect the signal transmission of sensors and the normal operation of the system, resulting in inaccurate detection data.
Performance: Abnormal fluctuations or incorrect values may occur in the detection data, and these abnormal situations are related to the working status of surrounding electromagnetic interference sources. For example, when nearby motors start, there will be significant fluctuations in the detection data. By taking shielding measures or adjusting equipment positions, the impact of electromagnetic interference on detection data can be reduced.
③ Data processing system malfunction
Reason: The data processing system of the ABS brake station, such as computers, data acquisition cards, etc., may malfunction. These faults can lead to errors in data collection, processing, and storage, resulting in inaccurate detection data. For example, if the interface of the data acquisition card is loose or damaged, it may result in the loss or error of the collected data.
Performance: The detection data may be missing, incorrect, or unable to display properly. By inspecting the hardware and software of the data processing system, the cause of the malfunction can be identified and repaired.