Pipeline leakage detection method and system for brake-by-wire system

Abstract

The invention relates to the technical field of vehicle brake-by-wire, and discloses a pipeline leakage detection method and system for a brake-by-wire system, and the method comprises the steps: obtaining the temperature, longitudinal acceleration and pressure of a pipeline; performing temperature anomaly judgment according to the pipeline temperature and a preset temperature threshold value to obtain a temperature anomaly signal, and performing pressure anomaly judgment according to the pipeline pressure and a preset pressure threshold value to obtain a pressure anomaly signal; performing vibration analysis according to the longitudinal acceleration to obtain a relative vibration abnormal value; when the temperature abnormal signal or the pressure abnormal signal is received and the relative vibration abnormal value is larger than a preset first vibration threshold value, a pipeline leakage signal is generated; generating an execution mechanism abnormal signal according to the relative vibration abnormal value; and according to the pipeline leakage signal and the execution mechanism abnormal signal, a braking state is judged, and a leakage detection result is generated. According to the method, the pipeline detection precision can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle brake-by-wire control, and in particular to a pipeline leakage detection method and system for a brake-by-wire control system. Background Art

[0002] The vehicle's electromechanical brake-by-wire system (EMB) is an advanced automotive braking technology that uses electronic circuits and electromechanical units to achieve precise control of vehicle braking during driving. Unlike traditional hydraulic or pneumatic brake systems, EMB eliminates the mechanical connection between the brake pedal and the brake wheel cylinder and replaces it with an intelligent control system consisting of an electronic control unit (ECU), a pedal simulator, and an electromechanical actuator. This design not only simplifies the vehicle chassis structure and reduces weight, but also improves the braking response speed, optimizes the overall vehicle performance, and makes the driving experience smoother and more stable.

[0003] In the prior art, in order to ensure the safety and reliability of the wire control brake system, temperature sensors, pressure sensors or displacement measuring devices are used to monitor the status of the brake system. Specifically, when the driver steps on the brake pedal, the pedal simulator transmits a signal to the electronic control unit, which calculates the required braking force based on the received information and sends instructions to the electromechanical actuator to perform the actual braking operation. At the same time, the monitoring sensors in the system collect data in real time, such as temperature changes, pressure levels, piston displacement and other parameters, so as to promptly detect and deal with existing problems. For example, in terms of detecting whether there is a leak in the pipeline, the traditional approach is to set a fixed pressure threshold. Once the monitored pressure value is lower than this threshold, it is considered that there is a leak in the system.

[0004] However, existing monitoring methods have some shortcomings. Relying on a single type of sensor alone cannot fully and accurately reflect the health of the brake system. For example, although using only a pressure sensor can monitor the pressure changes in the system, it does not work when faced with false alarms caused by temperature fluctuations or pressure loss due to other reasons; similarly, if you only rely on a temperature sensor, it is difficult to directly perceive abnormal pressure conditions, especially when there are problems such as oil leakage or pipeline damage in the wire control brake system. The method of using a single threshold method for leak detection is also too simple, ignoring the impact of temperature factors on the results, resulting in low accuracy of pipeline detection. Summary of the invention

[0005] The present invention provides a pipeline leakage detection method and system for a brake-by-wire system, so as to improve the accuracy of pipeline leakage detection of the brake-by-wire system.

[0006] In a first aspect, in order to solve the above technical problems, the present invention provides a pipeline leakage detection method for a wire control brake system, comprising:

[0007] Obtain pipeline temperature, longitudinal acceleration and pipeline pressure;

[0008] Performing temperature abnormality judgment according to the pipeline temperature and a preset temperature threshold to obtain a temperature abnormality signal, and performing pressure abnormality judgment according to the pipeline pressure and a preset pressure threshold to obtain a pressure abnormality signal;

[0009] Performing vibration analysis according to the longitudinal acceleration to obtain a relative vibration abnormality value;

[0010] When the temperature abnormality signal or the pressure abnormality signal is received and the relative vibration abnormality value is greater than a preset first vibration threshold, a pipeline leakage signal is generated;

[0011] When the relative vibration abnormal value is greater than a preset second vibration threshold, an actuator abnormal signal is generated;

[0012] The braking state is judged according to the pipeline leakage signal and the actuator abnormality signal to generate a leakage detection result.

[0013] In an optional implementation, the obtaining of pipeline temperature, longitudinal acceleration and pipeline pressure includes:

[0014] Collect pipeline temperature, longitudinal acceleration and pipeline pressure according to the preset sampling period;

[0015] The pipeline pressure includes a first control air pressure value and a second control air pressure value.

[0016] In an optional embodiment, the step of performing temperature abnormality judgment according to the pipeline temperature and a preset temperature threshold to obtain a temperature abnormality signal, and performing pressure abnormality judgment according to the pipeline pressure and a preset pressure threshold to obtain a pressure abnormality signal, includes:

[0017] When the pipeline temperature is lower than a preset minimum temperature threshold, a low temperature abnormality signal is generated;

[0018] When the pipeline temperature is greater than a preset maximum temperature threshold, a high temperature abnormality signal is generated;

[0019] When the first control air pressure value is less than a preset minimum pressure threshold, a low pressure abnormality signal is generated;

[0020] When the second control air pressure value is greater than the preset maximum pressure threshold, a high pressure abnormality signal is generated;

[0021] The temperature threshold includes the minimum temperature threshold and the maximum temperature threshold, and the pressure threshold includes the minimum pressure threshold and the maximum pressure threshold.

[0022] In an optional implementation manner, performing vibration analysis according to the longitudinal acceleration to obtain a relative vibration abnormality value includes:

[0023] The relative vibration anomaly value is calculated by the following formula:

[0024] D max =|V max (t)-V max (t-1)|

[0025] D min = |Vmin(t) -V min (t-1)|

[0026] D=D max +D min

[0027] Among them, D max is the maximum vibration difference, D min is the minimum vibration difference, D is the relative vibration abnormality, V max (t) is the maximum acceleration value of the current sampling period, V max (t-1) is the maximum acceleration value of the previous sampling period, V min (t) is the minimum acceleration value of the current sampling period, V min (t-1 ) is the minimum acceleration value of the previous sampling period, and t and t-1 are the sampling period numbers.

[0028] In an optional implementation, after generating a pipeline leakage signal when the temperature abnormality signal or the pressure abnormality signal is received and the relative vibration abnormality value is greater than a preset first vibration threshold, the method further includes:

[0029] When the temperature abnormality signal or the pressure abnormality signal is not received and the relative vibration abnormality value is less than the first vibration threshold, it is determined that the pipeline is not leaking, and the pipeline temperature, longitudinal acceleration and pipeline pressure are re-acquired.

[0030] In an optional implementation, the step of judging the braking state according to the pipeline leakage signal and the actuator abnormality signal to generate a leakage detection result includes:

[0031] When the pipeline leakage signal is received but the actuator abnormality signal is not received, the leakage detection result is output as leakage;

[0032] When the pipeline leakage signal is received and the actuator abnormality signal is received, the leakage detection result is output as a serious leakage;

[0033] When the pipeline leakage signal is not received and the actuator abnormality signal is not received, the leakage detection result is output as a normal state.

[0034] In an optional implementation, the temperature abnormality signal includes: a low temperature abnormality signal and a high temperature abnormality signal; the pressure abnormality signal includes: a low pressure abnormality signal and a high pressure abnormality signal.

[0035] In a second aspect, the present invention provides a pipeline leakage detection system for a wire control brake system, comprising:

[0036] A data acquisition module, used to obtain pipeline temperature, longitudinal acceleration and pipeline pressure;

[0037] an abnormality detection module, used to judge temperature abnormality according to the pipeline temperature and a preset temperature threshold value, and obtain a temperature abnormality signal, and to judge pressure abnormality according to the pipeline pressure and a preset pressure threshold value, and obtain a pressure abnormality signal;

[0038] A vibration analysis module, used for performing vibration analysis according to the longitudinal acceleration to obtain a relative vibration abnormality value;

[0039] A leakage detection module, configured to generate a pipeline leakage signal when the temperature abnormality signal or the pressure abnormality signal is received and the relative vibration abnormality value is greater than a preset first vibration threshold;

[0040] A mechanism detection module, used for generating an actuator abnormality signal when the relative vibration abnormality value is greater than a preset second vibration threshold;

[0041] The result generating module is used to judge the braking state according to the pipeline leakage signal and the actuator abnormality signal, and generate a leakage detection result.

[0042] In a third aspect, the present invention further provides an electronic device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the method for detecting pipeline leakage for a brake-by-wire system described in any one of the above is implemented.

[0043] In a fourth aspect, the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute any one of the above-mentioned pipeline leakage detection methods for a wire control brake system.

[0044] Compared with the prior art, the present invention has the following beneficial effects: the present invention discloses a pipeline leakage detection method and system for a wire control brake system, the method comprising obtaining pipeline temperature, longitudinal acceleration and pipeline pressure; judging temperature anomaly according to the pipeline temperature and a preset temperature threshold to obtain a temperature anomaly signal, and judging pressure anomaly according to the pipeline pressure and a preset pressure threshold to obtain a pressure anomaly signal; performing vibration analysis according to the longitudinal acceleration to obtain a relative vibration anomaly value; generating a pipeline leakage signal when the temperature anomaly signal or the pressure anomaly signal is received and the relative vibration anomaly value is greater than a preset first vibration threshold; generating an actuator abnormality signal according to the relative vibration anomaly value; judging the braking state according to the pipeline leakage signal and the actuator abnormality signal to generate a leakage detection result. This method can improve the accuracy of pipeline detection.

[0045] Specifically, the technical means of collecting the pipeline temperature, longitudinal acceleration, and pipeline pressure including the first control air pressure value and the second control air pressure value according to the preset sampling period provides data support for the wire control brake system. The use of the preset sampling period for data collection ensures the regularity and consistency of data collection. This not only helps to establish a stable and reliable data stream, but also enables subsequent data analysis and processing to be carried out based on a time series, so as to better capture the trend of vehicle operation status changing over time. Secondly, the specific parameters of pipeline temperature, longitudinal acceleration and pipeline pressure (including the first control air pressure value and the second control air pressure value) are collected, reflecting the comprehensive coverage of the working environment and internal state monitoring of the wire control brake system. The measurement of pipeline temperature can help understand the operating temperature range of brake fluid or gas, which is crucial for judging whether there is an overheating risk; while the longitudinal acceleration information provides key clues about the dynamic process of vehicle acceleration or deceleration, which is of direct significance for evaluating the braking effect. More importantly, recording the first control air pressure value and the second control air pressure value separately means that the method can distinguish the pressure differences at different stages or positions, which provides an important basis for identifying potential leaks. This method introduces a multi-dimensional data monitoring mechanism into the pipeline leakage detection of the wire control brake system by periodically collecting key physical quantities. This method enhances the fault diagnosis capability and can achieve more accurate pipeline leakage detection.

[0046] Furthermore, the method introduces a more detailed and comprehensive logic mechanism in processing abnormal signals and judging the state of the actuator. This method not only improves the accuracy of the system's judgment on the pipeline leakage status, but also enhances the ability to identify different leakage degrees. First, after the pipeline leakage signal is generated when the temperature abnormality signal or the pressure abnormality signal is an abnormal signal and the relative vibration abnormality value is greater than the preset first vibration threshold, when these abnormal signals are converted to normal signals and the relative vibration abnormality value is less than the first vibration threshold, it is determined that there is no leakage in the pipeline, and the data collection process is restarted. This mechanism ensures that the leakage detection process is reset only when all monitoring indicators return to normal, avoiding the occurrence of misjudgment, and maintaining the continuity and stability of the system through cyclic monitoring. The above strategy achieves accurate control of the health status of the wire control brake system by comprehensively analyzing multi-dimensional data such as temperature, pressure and vibration, and combining the working status of the actuator to evaluate the leakage situation. This approach effectively improves the accuracy of fault diagnosis, reduces the false alarm rate, effectively improves the detection efficiency by distinguishing between ordinary leakage and severe leakage, and achieves accurate pipeline detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a schematic flow chart of a pipeline leakage detection method for a wire control brake system provided by a first embodiment of the present invention;

[0048] Figure 2 It is a schematic diagram of the structure of a pipeline leakage detection system for a wire control brake system provided by the second embodiment of the present invention. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] The vehicle's electromechanical brake-by-wire system (EMB) is an advanced automotive braking technology that uses electronic circuits and electromechanical units to achieve precise control of vehicle braking during driving. Unlike traditional hydraulic or pneumatic brake systems, EMB eliminates the mechanical connection between the brake pedal and the brake wheel cylinder and replaces it with an intelligent control system consisting of an electronic control unit (ECU), a pedal simulator, and an electromechanical actuator. This design not only simplifies the vehicle chassis structure and reduces weight, but also improves the braking response speed, optimizes the overall vehicle performance, and makes the driving experience smoother and more stable.

[0051] In the prior art, in order to ensure the safety and reliability of the wire control brake system, temperature sensors, pressure sensors or displacement measuring devices are used to monitor the status of the brake system. Specifically, when the driver steps on the brake pedal, the pedal simulator transmits a signal to the electronic control unit, which calculates the required braking force based on the received information and sends instructions to the electromechanical actuator to perform the actual braking operation. At the same time, the monitoring sensors in the system collect data in real time, such as temperature changes, pressure levels, piston displacement and other parameters, so as to promptly detect and deal with existing problems. For example, in terms of detecting whether there is a leak in the pipeline, the traditional approach is to set a fixed pressure threshold. Once the monitored pressure value is lower than this threshold, it is considered that there is a leak in the system.

[0052] However, existing monitoring methods have some shortcomings. Relying on a single type of sensor alone cannot fully and accurately reflect the health of the brake system. For example, although using only a pressure sensor can monitor the pressure changes in the system, it does not work when faced with false alarms caused by temperature fluctuations or pressure loss due to other reasons; similarly, if you only rely on a temperature sensor, it is difficult to directly perceive abnormal pressure conditions, especially when there are problems such as oil leakage or pipeline damage in the wire control brake system. The method of using a single threshold method for leak detection is also too simple, ignoring the impact of temperature factors on the results, resulting in low accuracy of pipeline detection.

[0053] To solve the above problems, refer to Figure 1 A first embodiment of the present invention provides a pipeline leakage detection method for a wire control brake system, comprising the following steps:

[0054] S11, obtaining pipeline temperature, longitudinal acceleration and pipeline pressure;

[0055] S12, performing temperature abnormality judgment according to the pipeline temperature and a preset temperature threshold to obtain a temperature abnormality signal, and performing pressure abnormality judgment according to the pipeline pressure and a preset pressure threshold to obtain a pressure abnormality signal;

[0056] S13, performing vibration analysis according to the longitudinal acceleration to obtain a relative vibration abnormality value;

[0057] S14, when the temperature abnormality signal or the pressure abnormality signal is received and the relative vibration abnormality value is greater than a preset first vibration threshold, generating a pipeline leakage signal;

[0058] S15, when the relative vibration abnormal value is greater than a preset second vibration threshold, generating an actuator abnormality signal;

[0059] S16, judging the braking state according to the pipeline leakage signal and the actuator abnormality signal, and generating a leakage detection result.

[0060] In step S11 , the pipeline temperature, longitudinal acceleration and pipeline pressure are acquired.

[0061] In one implementation, the pipeline temperature, longitudinal acceleration and pipeline pressure are collected according to a preset sampling period; the pipeline pressure includes a first control air pressure value and a second control air pressure value.

[0062] It is worth noting that the system regularly collects the above parameters according to the preset sampling period. The sensor will measure once at each set time interval and transmit the result to the electronic control unit (ECU) or other processing device. The set sampling period is 3ms and the sampling rate is 1000hz. For the line pressure, it is not just a single pressure value, but contains two different control air pressure values-the first control air pressure value and the second control air pressure value. This is to monitor the pressure difference in different wheel cylinders during braking separately. The first control air pressure value and the second control air pressure value represent the highest pressure and the lowest pressure in the braking system respectively.

[0063] In step S12, a temperature anomaly is determined based on the pipeline temperature and a preset temperature threshold to obtain a temperature anomaly signal, and a pressure anomaly is determined based on the pipeline pressure and a preset pressure threshold to obtain a pressure anomaly signal.

[0064] In one embodiment, when the pipeline temperature is lower than a preset minimum temperature threshold, a low temperature abnormality signal is generated; when the pipeline temperature is higher than a preset maximum temperature threshold, a high temperature abnormality signal is generated; when the first control air pressure value is lower than a preset minimum pressure threshold, a low pressure abnormality signal is generated; when the second control air pressure value is higher than a preset maximum pressure threshold, a high pressure abnormality signal is generated; wherein the temperature threshold includes the minimum temperature threshold and the maximum temperature threshold, and the pressure threshold includes the minimum pressure threshold and the maximum pressure threshold.

[0065] It is worth noting that the minimum temperature threshold is -10℃ and the maximum temperature threshold is 80℃. For the first control air pressure value, the minimum pressure threshold is set to 0.5bar; for the second control air pressure value, the maximum pressure threshold is set to 16bar. For example: if the sensor detects that the pipeline temperature has dropped to -12℃, which is lower than the minimum temperature threshold of -10℃, the system will generate a low temperature abnormality signal. This means that the ambient temperature is too low or there is a cooling problem. If the temperature reported by the sensor reaches 85℃, which exceeds the maximum temperature threshold of 80℃, a high temperature abnormality signal will be generated. This situation is caused by excessive heat generated during braking or other heat sources. If the first control air pressure value drops to 0.4bar, which is lower than the minimum pressure threshold of 0.5bar, a low pressure abnormality signal will be generated. This indicates that there is a leak in the system or other problems that cause insufficient pressure. If the second control air pressure value rises to 17bar, which exceeds the maximum pressure threshold of 16bar, a high pressure abnormality signal will be triggered. This is an abnormal pressurization phenomenon caused by excessive braking operation or other reasons.

[0066] In step S13, a vibration analysis is performed according to the longitudinal acceleration to obtain a relative vibration abnormality value.

[0067] In one implementation, the relative vibration anomaly value is calculated using the following formula:

[0068] D max =|V max (t)-V max (t-1)|

[0069] D min =|V min (t)-V min (t-1)|

[0070] D=D max +D min

[0071] Among them, D max is the maximum vibration difference, D min is the minimum vibration difference, D is the relative vibration abnormality, V max (t) is the maximum acceleration value of the current sampling period, V max (t-1) is the maximum acceleration value of the previous sampling period, V min (t) is the minimum acceleration value of the current sampling period, V min (t-1) is the minimum acceleration value of the previous sampling period, and t and t-1 are the sampling period numbers.

[0072] It is worth noting that D maxIndicates the maximum vibration difference, that is, the absolute difference between the maximum acceleration of the current sampling period and the maximum acceleration of the previous sampling period. This value reflects the amplitude of the most violent motion state change in two consecutive periods. min is the minimum vibration difference, which is the minimum acceleration of the current sampling period minus the minimum acceleration of the previous sampling period. This difference shows the trend of the change of the slightest motion state between the two periods. The absolute value is used to ensure that the difference is positive, regardless of the actual direction of change. The relative vibration anomaly value is obtained by adding the maximum and minimum vibration differences to obtain a comprehensive indicator to measure the change in the overall vibration characteristics between two samplings. Here, the difference method is used to filter out the influence of some background noise or short-term fluctuations, because these factors will not cause such obvious differences between adjacent periods. On the contrary, real abnormal events will cause more significant vibration changes, making the relative vibration anomaly value exceed the normal range. The larger the relative vibration anomaly value, the more it means that there is an emergency that changes the stability of the linear control system. For example: in the first sampling period, the vehicle is driving on a flat road with a maximum acceleration of 0.5 and a minimum acceleration of -0.3; in the second sampling period, the vehicle passes through a speed bump with a maximum acceleration of 2.5 and a minimum acceleration of -1.8. The calculated relative vibration anomaly value is 3.5, and the preset threshold is 2, indicating that an abnormal situation has occurred. The unit of all values ​​is meters per square second. But it does not mean that there is a problem with pipeline leakage, so the temperature and pressure conditions also need to be considered.

[0073] In step S14, when the temperature abnormality signal or the pressure abnormality signal is received and the relative vibration abnormality value is greater than a preset first vibration threshold, a pipeline leakage signal is generated.

[0074] In one implementation, when the temperature abnormality signal or the pressure abnormality signal is not received and the relative vibration abnormality value is less than the first vibration threshold, it is determined that the pipeline is not leaking, and the pipeline temperature, longitudinal acceleration and pipeline pressure are reacquired.

[0075] The abnormal signal includes: a low temperature abnormal signal, a high temperature abnormal signal, a low pressure abnormal signal or a high pressure abnormal signal.

[0076] It is worth noting that the vibration level of the system under normal operating conditions can be determined by monitoring and recording vibration data without leakage, and then the first vibration threshold can be set; the first vibration threshold should be slightly higher than the baseline vibration level to distinguish normal vibration from abnormal vibration. The system first checks whether there are any temperature abnormality signals or pressure abnormality signals. If any abnormal signal exists, it will enter the next step of vibration analysis. Next, the system will evaluate whether the relative vibration abnormality value exceeds the preset first vibration threshold. This threshold is used to distinguish between vibration under normal operating conditions and abnormal vibration caused by leakage. If temperature or pressure abnormalities are found in the first step, and the relative vibration abnormality value in the second step exceeds the first vibration threshold, the system will generate a "pipeline leakage signal". This means that there is strong evidence that there is a leak or other serious problem in the pipeline, and immediate action is required for inspection or repair.

[0077] In another embodiment, when all monitoring indicators are normal, the system will continue to monitor without triggering an alarm: if the temperature abnormality signal and the pressure abnormality signal are both normal signals (i.e., no low temperature / high temperature or low pressure / high pressure is detected), and the vibration detection is also within the normal range, in this case, the system can determine that the pipeline is not leaking under the current conditions. In order to continuously monitor the health status of the system, the data collection process will be automatically restarted to obtain the latest pipeline temperature, longitudinal acceleration and pipeline pressure data again for the next cycle of analysis.

[0078] In step S15, when the relative vibration abnormal value is greater than a preset second vibration threshold, an actuator abnormality signal is generated.

[0079] It is worth noting that this embodiment adopts a graded threshold system, where the first vibration threshold is used to preliminarily detect possible anomalies, and the second vibration threshold is used to confirm serious leakage; the second vibration threshold is set significantly higher than the first vibration threshold to ensure that the actuator abnormality signal is triggered only when more severe or unusual vibrations occur. This design is to distinguish between ordinary vibrations and more serious actuator problems. The actuator abnormality signal means that the actuator (such as the electromechanical actuator of the braking system) has mechanical failures, loose connections, damaged components, etc., which will cause additional vibrations or fail to respond correctly to control instructions.

[0080] It is worth noting that the actuator is essentially a driving device that can provide linear or rotary motion and can use some form of driving energy to work under the action of a specific control signal. Its main task is to receive instructions from the controller (such as signals from a regulator or computer), and then through power amplification and conversion, finally output the corresponding angular displacement or linear displacement to push the regulating valve or other types of regulating mechanisms, thereby changing the flow of the regulated medium and realizing automatic control or manual control of process parameters. It is determined that the relative vibration abnormality value exceeding the second vibration threshold is caused by damage to the actuator.

[0081] In step S16, a braking state is determined based on the pipeline leakage signal and the actuator abnormality signal to generate a leakage detection result.

[0082] In one embodiment, when the pipeline leakage signal is received but the actuator abnormal signal is not received, the leakage detection result is output as leakage; when the pipeline leakage signal is received and the actuator abnormal signal is received, the leakage detection result is output as severe leakage; when the pipeline leakage signal and the actuator abnormal signal are not received, the leakage detection result is output as normal.

[0083] It is worth noting that when only a pipeline leakage signal is received but no actuator abnormality signal is received, it can be considered that there is a general leakage problem and inspection and maintenance are required. When both the pipeline leakage signal and the actuator abnormality signal are received at the same time, it indicates that the situation is more serious, there is a serious leakage or other complex faults, and emergency measures need to be taken immediately to repair it. The existence of leakage indicates that although the system has detected a leakage in the pipeline, it is not accompanied by an obvious actuator failure. Therefore, it can be considered that this is a relatively common leakage problem, which is a minor leakage caused by loose pipeline connections, aging of seals, etc. In this case, routine inspection and maintenance work, such as tightening connectors and replacing sealing materials, are carried out to prevent the problem from further deteriorating. Severe leakage indicates that not only pipeline leakage is detected, but also abnormal vibration or other forms of failure of the actuator are found, which means that the situation is more complicated and urgent. This is a chain reaction caused by severe hydraulic or air pressure imbalance, or a mechanical failure of the actuator itself, which causes it to fail to work properly and causes additional vibration. In the face of such a situation, emergency measures must be taken immediately to repair it to avoid potential safety hazards. Normal status means that according to the currently monitored data, the temperature, pressure and vibration characteristics of the entire brake system are within the expected range, without any abnormal signs. At this time, the system will continue to maintain normal monitoring status, regularly re-acquire the latest pipeline temperature, longitudinal acceleration and pipeline pressure data to ensure continuous and stable operation.

[0084] In summary, the present invention discloses a pipeline leakage detection method for a brake-by-wire system, aiming to provide a more accurate and reliable pipeline leakage detection mechanism. This method integrates data from multiple sensors such as temperature, pressure, and vibration, and performs comprehensive analysis based on preset thresholds to effectively monitor pipeline leakage in a vehicle's electromechanical brake-by-wire system (EMB).

[0085] Specifically, the method first obtains key parameters such as pipeline temperature, longitudinal acceleration and pipeline pressure, and compares these data with the preset temperature threshold and pressure threshold to perform temperature abnormality judgment and pressure abnormality judgment, and generates temperature abnormality signal and pressure abnormality signal respectively. At the same time, based on the longitudinal acceleration data, the relative vibration abnormality value is calculated to evaluate whether the system is in an abnormal vibration state. In the case where the temperature abnormality signal or the pressure abnormality signal is judged to be abnormal, if the relative vibration abnormality value is found to exceed the preset first vibration threshold at the same time, it will trigger the generation of a pipeline leakage signal, indicating that there is a pipeline leakage problem. In addition, when the relative vibration abnormality value exceeds the higher set second vibration threshold, an actuator abnormality signal will also be generated, indicating that the actuator has a mechanical failure or other forms of failure, resulting in additional vibration or failure to respond correctly to the control command. The above two signals will serve as an important basis for the final braking state judgment, helping to determine whether there is a leakage and the extent of the leakage: if only the pipeline leakage signal is detected without the actuator abnormality signal, it is considered that there is a general leakage; if both are present, it is defined as a serious leakage; conversely, if no abnormal signal is received, the output result is a normal state.

[0086] This detection process not only takes into account the influence of a single factor, such as temperature fluctuations or pressure changes, but also introduces vibration characteristics as an auxiliary criterion, making the entire detection process more comprehensive and accurate. In particular, through the comprehensive analysis of multi-dimensional data such as temperature, pressure and vibration, false alarms caused by external environmental interference or non-leakage reasons within the system can be effectively reduced. For example, in the face of false alarms caused by temperature fluctuations, this method can identify them through vibration data analysis to avoid misjudgments caused by relying solely on pressure sensors. Similarly, for pressure loss phenomena caused by other reasons, temperature information can also be used for more accurate diagnosis.

[0087] In order to ensure the regularity and consistency of data collection, the present invention adopts a preset sampling period to regularly collect various parameters. This approach helps to establish a stable and reliable data stream, so that subsequent data analysis and processing can be carried out based on a time series, and better capture the trend of vehicle operating status changing over time. The specific parameters of pipeline temperature, longitudinal acceleration and pipeline pressure are collected, reflecting the comprehensive coverage of the working environment and internal state monitoring of the wire control brake system. Pipeline temperature measurement helps to understand the operating temperature range of brake fluid or gas, which is crucial to determine whether there is an overheating risk; and longitudinal acceleration information provides key clues about the dynamic process of vehicle acceleration or deceleration, which is directly meaningful for evaluating the braking effect. More importantly, recording the first control air pressure value and the second control air pressure value separately means that the method can distinguish the pressure differences in different stages or positions, which provides an important basis for identifying potential leaks.

[0088] Furthermore, in terms of processing abnormal signals and judging the status of actuators, this method introduces a more detailed and comprehensive logical mechanism. After the pipeline leakage signal is generated when the temperature abnormality signal or the pressure abnormality signal is an abnormal signal and the relative vibration abnormality value is greater than the preset first vibration threshold, when these abnormal signals are converted to normal signals and the relative vibration abnormality value is less than the first vibration threshold, it is determined that there is no leakage in the pipeline and the data collection process is restarted. This mechanism ensures that the leakage detection process is reset only when all monitoring indicators return to normal, avoiding the occurrence of misjudgment, and maintaining the continuity and stability of the system through cyclic monitoring. The above strategy achieves precise control of the health status of the wire control brake system by comprehensively analyzing multi-dimensional data such as temperature, pressure and vibration, and combining the working status of the actuator to evaluate the leakage situation. This method effectively improves the accuracy of fault diagnosis, reduces the false alarm rate, improves the detection efficiency by distinguishing between ordinary leakage and severe leakage, and achieves accurate pipeline detection accuracy.

[0089] Reference Figure 2 A second embodiment of the present invention provides a pipeline leakage detection system for a wire control brake system, comprising:

[0090] A data acquisition module, used to obtain pipeline temperature, longitudinal acceleration and pipeline pressure;

[0091] an abnormality detection module, used to judge temperature abnormality according to the pipeline temperature and a preset temperature threshold value, and obtain a temperature abnormality signal, and to judge pressure abnormality according to the pipeline pressure and a preset pressure threshold value, and obtain a pressure abnormality signal;

[0092] A vibration analysis module, used for performing vibration analysis according to the longitudinal acceleration to obtain a relative vibration abnormality value;

[0093] A leakage detection module, configured to generate a pipeline leakage signal when the temperature abnormality signal or the pressure abnormality signal is received and the relative vibration abnormality value is greater than a preset first vibration threshold;

[0094] A mechanism detection module, used for generating an actuator abnormality signal when the relative vibration abnormality value is greater than a preset second vibration threshold;

[0095] The result generating module is used to judge the braking state according to the pipeline leakage signal and the actuator abnormality signal, and generate a leakage detection result.

[0096] Preferably, the data acquisition module is used to:

[0097] Obtain line temperature, longitudinal acceleration and line pressure, including:

[0098] Collect pipeline temperature, longitudinal acceleration and pipeline pressure according to the preset sampling period;

[0099] The pipeline pressure includes a first control air pressure value and a second control air pressure value.

[0100] Preferably, the anomaly detection module is used to:

[0101] Performing temperature abnormality judgment according to the pipeline temperature and a preset temperature threshold to obtain a temperature abnormality signal, and performing pressure abnormality judgment according to the pipeline pressure and a preset pressure threshold to obtain a pressure abnormality signal, including:

[0102] When the pipeline temperature is lower than a preset minimum temperature threshold, a low temperature abnormality signal is generated;

[0103] When the pipeline temperature is greater than a preset maximum temperature threshold, a high temperature abnormality signal is generated;

[0104] When the first control air pressure value is less than a preset minimum pressure threshold, a low pressure abnormality signal is generated;

[0105] When the second control air pressure value is greater than the preset maximum pressure threshold, a high pressure abnormality signal is generated;

[0106] The temperature threshold includes the minimum temperature threshold and the maximum temperature threshold, and the pressure threshold includes the minimum pressure threshold and the maximum pressure threshold.

[0107] Preferably, the vibration analysis module is used to:

[0108] Vibration analysis is performed according to the longitudinal acceleration to obtain relative vibration abnormality values, including:

[0109] The relative vibration anomaly value is calculated by the following formula:

[0110] D max =|V max (t)-V max (t-1)|

[0111] D min =|V min (t)-V min (t-1)|

[0112] D=D max +D min

[0113] Among them, D max is the maximum vibration difference, D min is the minimum vibration difference, D is the relative vibration abnormality, V max (t) is the maximum acceleration value of the current sampling period, V max (t-1) is the maximum acceleration value of the previous sampling period, V min (t) is the minimum acceleration value of the current sampling period, V min (t-1) is the minimum acceleration value of the previous sampling period, and t and t-1 are the sampling period numbers.

[0114] Preferably, the leakage detection module is used to:

[0115] When the temperature abnormality signal or the pressure abnormality signal is received and the relative vibration abnormality value is greater than a preset first vibration threshold, a pipeline leakage signal is generated;

[0116] When the temperature abnormality signal or the pressure abnormality signal is not received and the relative vibration abnormality value is less than the first vibration threshold, it is determined that the pipeline is not leaking, and the pipeline temperature, longitudinal acceleration and pipeline pressure are re-acquired;

[0117] Preferably, the mechanism detection module is used to:

[0118] When the relative vibration abnormal value is greater than a preset second vibration threshold, an actuator abnormality signal is generated.

[0119] Preferably, the result generation module is used to:

[0120] The braking state is judged according to the pipeline leakage signal and the actuator abnormality signal to generate a leakage detection result, including:

[0121] When the pipeline leakage signal is received but the actuator abnormality signal is not received, the leakage detection result is output as leakage;

[0122] When the pipeline leakage signal is received and the actuator abnormality signal is received, the leakage detection result is output as a serious leakage;

[0123] When the pipeline leakage signal is not received and the actuator abnormality signal is not received, the leakage detection result is output as a normal state.

[0124] It should be noted that a pipeline leakage detection system for a wire control brake system provided in an embodiment of the present invention is used to execute all process steps of a pipeline leakage detection method for a wire control brake system in the above embodiment. The working principles and beneficial effects of the two correspond one to one, and thus will not be elaborated upon.

[0125] The embodiment of the present invention further provides an electronic device. The electronic device includes: a processor, a memory, and a computer program stored in the memory and executable on the processor, such as a data acquisition program. When the processor executes the computer program, the steps in the above-mentioned pipeline leakage detection method for a wire control brake system are implemented, such as Figure 1 Alternatively, when the processor executes the computer program, the functions of the modules / units in the above-mentioned device embodiments are realized, such as the data acquisition module.

[0126] Exemplarily, the computer program may be divided into one or more modules / units, which are stored in the memory and executed by the processor to implement the present invention. The one or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, which are used to describe the execution process of the computer program in the electronic device.

[0127] The electronic device may be a computing device such as a desktop computer, a notebook, a PDA, and a smart tablet. The electronic device may include, but is not limited to, a processor and a memory. Those skilled in the art will appreciate that the above components are merely examples of electronic devices and do not constitute a limitation on the electronic device. The electronic device may include more or fewer components than the above components, or may combine certain components, or different components. For example, the electronic device may also include input and output devices, network access devices, buses, etc.

[0128] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the electronic device, and uses various interfaces and lines to connect various parts of the entire electronic device.

[0129] The memory can be used to store the computer program and / or module, and the processor realizes various functions of the electronic device by running or executing the computer program and / or module stored in the memory, and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0130] Wherein, if the module / unit integrated in the electronic device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0131] It should be noted that the device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the accompanying drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art may understand and implement it without paying any creative effort.

[0132] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pipeline leakage detection method for a wire control brake system, characterized in that: include: Obtain pipeline temperature, longitudinal acceleration and pipeline pressure; Performing temperature abnormality judgment according to the pipeline temperature and a preset temperature threshold to obtain a temperature abnormality signal, and performing pressure abnormality judgment according to the pipeline pressure and a preset pressure threshold to obtain a pressure abnormality signal; Performing vibration analysis according to the longitudinal acceleration to obtain a relative vibration abnormality value; When the temperature abnormality signal or the pressure abnormality signal is received and the relative vibration abnormality value is greater than a preset first vibration threshold, a pipeline leakage signal is generated; When the relative vibration abnormal value is greater than a preset second vibration threshold, an actuator abnormal signal is generated; The braking state is judged according to the pipeline leakage signal and the actuator abnormality signal to generate a leakage detection result.

2. The pipeline leakage detection method for a wire control brake system according to claim 1, characterized in that: The obtaining of pipeline temperature, longitudinal acceleration and pipeline pressure includes: Collect pipeline temperature, longitudinal acceleration and pipeline pressure according to the preset sampling period; The pipeline pressure includes a first control air pressure value and a second control air pressure value.

3. The pipeline leakage detection method for a wire control brake system according to claim 1, characterized in that: The method of performing temperature abnormality judgment according to the pipeline temperature and a preset temperature threshold to obtain a temperature abnormality signal, and performing pressure abnormality judgment according to the pipeline pressure and a preset pressure threshold to obtain a pressure abnormality signal, includes: When the pipeline temperature is lower than a preset minimum temperature threshold, a low temperature abnormality signal is generated; When the pipeline temperature is greater than a preset maximum temperature threshold, a high temperature abnormality signal is generated; When the first control air pressure value is less than a preset minimum pressure threshold, a low pressure abnormality signal is generated; When the second control air pressure value is greater than the preset maximum pressure threshold, a high pressure abnormality signal is generated; The temperature threshold includes the minimum temperature threshold and the maximum temperature threshold, and the pressure threshold includes the minimum pressure threshold and the maximum pressure threshold.

4. The pipeline leakage detection method for a wire control brake system according to claim 1, characterized in that: The performing vibration analysis according to the longitudinal acceleration to obtain a relative vibration abnormal value includes: The relative vibration anomaly value is calculated by the following formula: D max =|V max (t)-V max (t-1)| D min = |Vmin(t) -V min (t-1)| D=D max +D min Among them, D max is the maximum vibration difference, D min is the minimum vibration difference, D is the relative vibration abnormality, V max (t) is the maximum acceleration value of the current sampling period, V max (t-1) is the maximum acceleration value of the previous sampling period, V min (t) is the minimum acceleration value of the current sampling period, V min (t-1) is the minimum acceleration value of the previous sampling period, and t and t-1 are the sampling period numbers.

5. The pipeline leakage detection method for a wire control brake system according to claim 1, characterized in that: When the temperature abnormality signal or the pressure abnormality signal is received and the relative vibration abnormality value is greater than a preset first vibration threshold, generating a pipeline leakage signal includes: When the temperature abnormality signal or the pressure abnormality signal is not received and the relative vibration abnormality value is less than the first vibration threshold, it is determined that the pipeline is not leaking, and the pipeline temperature, longitudinal acceleration and pipeline pressure are re-acquired.

6. The pipeline leakage detection method for a wire control brake system according to claim 1, characterized in that: The step of judging the braking state according to the pipeline leakage signal and the actuator abnormality signal and generating a leakage detection result includes: When the pipeline leakage signal is received but the actuator abnormality signal is not received, the leakage detection result is output as leakage; When the pipeline leakage signal is received and the actuator abnormality signal is received, the leakage detection result is output as a serious leakage; When the pipeline leakage signal is not received and the actuator abnormality signal is not received, the leakage detection result is output as a normal state.

7. The pipeline leakage detection method for a wire control brake system according to claim 3, characterized in that: The temperature abnormality signal includes: a low temperature abnormality signal and a high temperature abnormality signal; the pressure abnormality signal includes: a low pressure abnormality signal and a high pressure abnormality signal.

8. A pipeline leakage detection system for a wire control brake system, characterized in that: include: A data acquisition module, used to obtain pipeline temperature, longitudinal acceleration and pipeline pressure; an abnormality detection module, used to judge temperature abnormality according to the pipeline temperature and a preset temperature threshold value, and obtain a temperature abnormality signal, and to judge pressure abnormality according to the pipeline pressure and a preset pressure threshold value, and obtain a pressure abnormality signal; A vibration analysis module, used for performing vibration analysis according to the longitudinal acceleration to obtain a relative vibration abnormality value; A leakage detection module, configured to generate a pipeline leakage signal when the temperature abnormality signal or the pressure abnormality signal is received and the relative vibration abnormality value is greater than a preset first vibration threshold; A mechanism detection module, used for generating an actuator abnormality signal when the relative vibration abnormality value is greater than a preset second vibration threshold; The result generating module is used to judge the braking state according to the pipeline leakage signal and the actuator abnormality signal, and generate a leakage detection result.

9. An electronic device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the pipeline leakage detection method for a wire control brake system as claimed in any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the pipeline leakage detection method for a wire control brake system according to any one of claims 1 to 7.

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