A Device For Testing Braking Force Of A Vehicle

Inaccurate ABS brake platform detection data, sensor failure and system parameter setting errors may be the key reasons, in addition, there are other factors will also lead to deviations in the detection data, the following is your detailed analysis: Sensor failure 1. The sensor is damaged Reason: The sensor of the ABS brake table is in a complex working environment for a long time, such as high temperature, humidity, vibration, etc., which may cause damage to the electronic components inside the sensor. For example, the induction coil of the wheel speed sensor may break due to vibration, or the chip of the sensor may burn due to excessive temperature. In addition, the sensor by external impact, corrosion, etc., will also make it damaged. Performance: The detected data may have abnormal fluctuations, value jumps or no signal output at all. For example, when the wheel speed sensor is damaged, the corresponding wheel speed data may be displayed as zero or a fixed error value, or the data may fluctuate greatly in a short period of time, resulting in the ABS brake station unable to accurately calculate the brake performance parameters. 2. The sensor is improperly installed Cause: If the sensor installation position is not accurate, it will affect the accurate acquisition of signals. For example, if the gap between the wheel speed sensor and the gear ring is too large or too small, the inductive signal will be weakened or unstable. In addition, the installation Angle of the sensor is not correct, which may also make the collected signal inaccurate. Performance: The test data may be biased and inconsistent with 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, you can find the problem of improper installation. 3. Sensor contamination Reason: If the sensor surface is covered by dust, oil, iron filings and other pollutants, it will affect its induction performance. For example, the sensor head of the wheel speed sensor is adsorbed by iron debris, which will interfere with its sensing of the tooth tip and tooth valley of the gear ring, resulting in inaccurate signals collected. Performance: Test data may fluctuate or be inaccurate. For example, wheel speed data may have intermittent error values, or the stability of the data may become worse. After cleaning the sensor surface, the detection data may return to normal. The system parameters are incorrectly set 1. Vehicle parameters are incorrectly set Reason: When using the ABS brake platform for testing, it is necessary to input the relevant parameters of the vehicle, such as vehicle type, tire specifications, wheelbase, etc. If these parameters are set incorrectly, the calculation model of the brake station will be inaccurate, and the detection data will be biased. For example, the input tire specifications do not match the actual tire specifications, which will affect the calculation of the wheel circumference, which in turn affects the calculation of wheel speed and braking distance. Performance: There are great differences between the test data and the actual situation, and the test data of different vehicles may have unreasonable consistency errors. For example, when a number of vehicles with different specifications are detected by the brake platform, the parameters such as the braking distance are very close, which may be caused by the wrong setting of vehicle parameters. 2. Check whether standard parameters are set incorrectly Reason: The test standard parameters of ABS brake platform, such as the qualified range of brake deceleration and the standard value of braking distance, need to be set according to relevant regulations and standards. If these parameters are set incorrectly, the detection results will be misjudged. For example, setting the qualifying lower limit for brake deceleration too low may allow some vehicles with substandard braking performance to pass the test. Performance: The test results may show a large number of qualified or unqualified vehicles that do not meet the actual situation. By checking the Settings of standard parameters, you can find the problem of parameter setting errors. 3. The system compensation parameters are incorrectly set Reason: In order to improve the detection accuracy, the ABS brake platform usually sets some compensation parameters, such as temperature compensation, humidity compensation, etc. If these compensation parameters are set incorrectly, the detection data will be affected by environmental factors and not accurate. For example, if the temperature compensation parameter is not set properly, the detection data may be biased when the ambient temperature changes. Performance: The test data will fluctuate unreasonably with the change of environmental factors. For example, in the case of large temperature changes, the detection data of the same vehicle is greatly different, which may be due to the wrong setting of temperature compensation parameters. Other factors 1. Mechanical parts wear Reason: The mechanical parts of the ABS brake platform, such as rollers, chains, gears, etc., will wear out after long-term use. The wear of these components will affect the transmission accuracy and stability of the brake platform, resulting in inaccurate detection data. For example, the friction between the wheel and the drum will change due to the wear of the drum surface, affecting the measurement of the wheel speed. Performance: The detection data may fluctuate or be biased, and the accuracy of the data will gradually decrease with the increase of use time. By checking the wear of mechanical parts, you can find the impact of wear on the test data. 2. Electrical interference Reason: The electrical system of the ABS brake station may be subject to electromagnetic interference in the surrounding environment, such as nearby motors, transformers, radio equipment, etc. These electromagnetic interference will affect the signal transmission of the sensor 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 anomalies are related to the working status of the surrounding electromagnetic interference sources. For example, when a nearby motor is started, the detection data will fluctuate significantly. By taking shielding measures or adjusting the position of the device, the impact of electromagnetic interference on the detection data can be reduced. 3. The data processing system is faulty Reason: the data processing system of ABS brake platform, such as computer, data acquisition card, etc., may fail. These faults may cause 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, the collected data may be lost or incorrect. Performance: The detection data may be missing, incorrect, or not displayed properly. By checking the hardware and software of the data processing system, you can find the cause of the failure and repair it. When emergency braking occurs or the road resistance suddenly increases, the ABS system will automatically adjust the brake pressure, so that the vehicle will not have brake failure, skidding and other conditions, while ensuring the stability of the vehicle to prevent the vehicle from losing control. With the ABS braking system, we can brake stably and ensure safe driving. The design of the ABS braking structure and principle greatly improves the driving stability of the vehicle. When driving at high speed, the vehicle will not slip and even roll over after emergency braking. According to the survey, the ABS braking system can reduce the stopping distance of the vehicle during braking, and can reduce the stopping distance under the wet road by 20%, which greatly reduces the incidence of traffic accidents. Today, most modern cars have been equipped with ABS braking system, we should meditate to learn and understand the structure and principle of this innovative braking system, so as to better use in daily driving and avoid accidents.