Automobile engine pressure sensor interference and clamping stagnation diagnosis system and method

Abstract

The invention discloses an automobile engine pressure sensor interference and clamping stagnation diagnosis system and method, and particularly relates to the technical field of automobile engine diagnos.The method includes the steps that output signals of an air inlet pressure sensor, an exhaust pressure sensor or a fuel pressure sensor are obtained in real time and compared with a preset normal signal range determined based on different working conditions of an engine; and when the signal exceeds the range, the signal characteristics are further analyzed to judge whether the fault is an interference fault or a clamping stagnation fault, corresponding processing measures are taken for different fault types, the diagnosis system comprises a signal acquisition module, a judgment module, a fault analysis module and a processing execution module, and all the modules work cooperatively. The method has the advantages that faults can be accurately diagnosed, the system adaptability is enhanced, the maintenance cost and time are reduced, and safe operation of the vehicle is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of automotive engine diagnostic technology, and more specifically, to a diagnostic system and method for interference and jamming of automotive engine pressure sensors. Background Technology

[0002] Pressure sensors play a crucial role in the operation of a car engine. They are responsible for monitoring the pressure of the intake, exhaust, and fuel systems, providing key data to the engine control unit (ECU) to achieve precise engine control and ensure that engine performance, fuel economy, and emissions meet standards.

[0003] With the continuous development of automotive technology, engine operating conditions are becoming increasingly complex and diverse, placing higher demands on the reliability and accuracy of pressure sensors. However, current automotive engine pressure sensors face numerous problems in practical use. On the one hand, the increasing number of electronic devices in automobiles and the more complex the electromagnetic environment make pressure sensors highly susceptible to electromagnetic interference, leading to abnormal fluctuations in the output signal and affecting the engine control unit's accurate judgment of engine operating conditions. For example, when a strong electromagnetic source is present near the vehicle, the intake pressure sensor signal may experience momentary jumps, causing the engine control unit to misjudge the intake air volume, thereby affecting fuel injection and ignition timing, and reducing engine performance.

[0004] On the other hand, pressure sensors are prone to jamming during long-term use due to factors such as high temperatures, vibration, and oil contamination. Once a sensor jams, its output signal will not accurately reflect the actual pressure, causing the engine control unit to receive incorrect information and triggering abnormal engine operation. For example, a jammed fuel pressure sensor may prevent the engine from receiving adequate fuel, resulting in difficulty starting the engine, reduced power, or even failure to operate normally.

[0005] Existing diagnostic technologies have limitations in addressing these issues. Some diagnostic systems rely solely on simple threshold judgments to identify sensor faults, failing to effectively distinguish between interference signals and genuine sensor hardware failures, resulting in a high false alarm rate. Furthermore, the lack of effective real-time processing mechanisms for interference signals means that the engine may still experience a temporary performance degradation when subjected to interference. For stuck faults, it is difficult to detect them in their early stages, often requiring diagnosis only when obvious engine abnormalities occur. This not only increases vehicle maintenance costs but may also pose safety hazards to the driver during driving.

[0006] Furthermore, existing diagnostic systems typically do not adequately consider the normal signal variation range of pressure sensors under different engine operating conditions, resulting in low diagnostic accuracy under complex conditions. During the engine transition from idle to high speed, the lack of precise matching of normal signal ranges under different operating conditions can easily lead to missed or false diagnoses, failing to meet the demands of modern automotive engines for efficient and stable operation. Therefore, developing a system and method capable of accurately diagnosing interference and jamming faults in automotive engine pressure sensors is urgently needed. Summary of the Invention

[0007] In order to overcome the above-mentioned defects of the prior art, the present invention provides a diagnostic system and method for interference and jamming of automotive engine pressure sensors, so as to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a method for diagnosing interference and jamming in automotive engine pressure sensors, comprising the following steps: Real-time acquisition of the output signal from the automotive engine pressure sensor.

[0009] Based on a preset normal signal range, determine whether the output signal is within the normal range.

[0010] If the output signal exceeds the normal range, further analyze the signal characteristics to determine whether it is an interference or jamming fault.

[0011] Take appropriate measures based on the type of fault.

[0012] Preferably, the real-time acquisition of the output signal of the automotive engine pressure sensor includes acquiring the output signal of at least one of the intake pressure sensor, exhaust pressure sensor, and fuel pressure sensor.

[0013] Preferably, the preset normal signal range is calculated based on a large amount of experimental data and engine models according to different engine operating conditions.

[0014] Preferably, the further analysis of signal characteristics to determine whether it is interference or a jamming fault specifically includes: If the output signal exhibits high-frequency fluctuations and the fluctuation amplitude exceeds the normal range, but the duration is short, it is determined to be an interference fault. If the output signal remains at a fixed value or fluctuates within a very small range for a long time and does not match the current engine operating conditions, it is determined to be a jamming fault.

[0015] Preferably, the step of taking corresponding handling measures according to the fault type includes: For interference faults, start the signal filtering program to filter the sensor output signal to eliminate interference signals; For stuck faults, issue an alarm signal to remind the driver and record the fault code. At the same time, you can try to restore the normal operation of the sensor by adjusting the engine control parameters.

[0016] A system for performing the above-described method for diagnosing interference and jamming in automotive engine pressure sensors includes: The signal acquisition module is used to acquire the output signal of the automotive engine pressure sensor in real time. The signal judgment module determines whether the output signal is within the normal range based on a preset normal signal range. The fault analysis module, if the output signal exceeds the normal range, further analyzes the signal characteristics to determine whether it is an interference or jamming fault. The processing and execution module takes appropriate measures based on the type of fault.

[0017] Preferably, the signal acquisition module includes a signal acquisition circuit connected to the intake pressure sensor, exhaust pressure sensor, and fuel pressure sensor, for accurately acquiring the output signals of each pressure sensor.

[0018] Preferably, the signal judgment module stores a database of normal signal ranges determined according to different engine operating conditions, and makes a judgment by comparing the sensor output signal with the corresponding value in the database.

[0019] Preferably, the fault analysis module includes a signal feature analysis unit, which is used to perform high-frequency fluctuation analysis and duration analysis on the output signal that exceeds the normal range, so as to distinguish between interference faults and jamming faults.

[0020] Preferably, the processing execution module includes a signal filtering submodule, an alarm issuing submodule, a fault code recording submodule, and a parameter adjustment submodule, which are respectively used to handle interference faults, issue alarms, record fault codes, and attempt to restore the sensor to normal operation.

[0021] The technical effects and advantages of this invention are as follows: 1. By acquiring the pressure sensor output signal in real time and judging the normal signal range calculated based on a large amount of experimental data and engine models, and by deeply analyzing the signal characteristics, this invention can accurately distinguish between interference faults and jamming faults. Compared with traditional diagnostic methods, this reduces the possibility of misjudgment, improves the accuracy of fault diagnosis, and provides a reliable guarantee for the stable operation of the engine. For example, traditional methods may misjudge transient interference signals as sensor hardware failures, leading to unnecessary maintenance, while this invention can effectively avoid such situations through precise analysis.

[0022] 2. The preset normal signal range is determined according to different engine operating conditions, covering various operating conditions such as idling, acceleration, and deceleration. This enables the diagnostic system to adapt to the monitoring needs of the engine under various operating conditions. Whether it is the frequent start-stop in urban traffic congestion or the stable operating conditions at high speed, it can accurately judge the sensor status, which greatly improves the adaptability and practicality of the system.

[0023] 3. Once a fault is detected, the system can quickly take corresponding measures. For interference faults, the interference is eliminated in time through the signal filtering program to restore the signal to normal. For stuck faults, the fault code is recorded and the engine control parameters are adjusted to restore the sensor to work. This reduces the engine performance degradation and vehicle downtime caused by sensor failure. This not only reduces maintenance costs, but also improves the vehicle's utilization efficiency and reduces the inconvenience caused by maintenance.

[0024] 4. By promptly detecting and addressing pressure sensor malfunctions, the engine control unit can obtain accurate pressure data, ensuring the engine operates in optimal condition. This avoids problems such as excessively rich or lean air-fuel mixtures and abnormal ignition caused by sensor malfunctions, thereby guaranteeing safe vehicle operation and reducing safety risks arising from engine failures. Detailed Implementation

[0025] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] The automotive engine pressure sensor interference and jamming diagnostic system provided by this invention includes: The signal acquisition module is used to acquire the output signal of the automotive engine pressure sensor in real time. The signal judgment module determines whether the output signal is within the normal range based on a preset normal signal range. The fault analysis module, if the output signal exceeds the normal range, further analyzes the signal characteristics to determine whether it is an interference or jamming fault. The processing and execution module takes appropriate measures based on the type of fault.

[0027] The signal acquisition module includes a signal acquisition circuit connected to the intake pressure sensor, exhaust pressure sensor, and fuel pressure sensor, used to accurately acquire the output signals of each pressure sensor.

[0028] The signal judgment module stores a database of normal signal ranges determined according to different engine operating conditions, and makes judgments by comparing the sensor output signals with the corresponding values ​​in the database.

[0029] The fault analysis module includes a signal feature analysis unit, which is used to perform high-frequency fluctuation analysis and duration analysis on output signals that exceed the normal range, in order to distinguish between interference faults and jamming faults.

[0030] The processing execution module includes a signal filtering submodule, an alarm issuing submodule, a fault code recording submodule, and a parameter adjustment submodule, which are used to handle interference faults, issue alarms, record fault codes, and attempt to restore the sensor to normal operation, respectively.

[0031] In practical implementation, it consists of a block, a signal judgment module, a fault analysis module, and a processing execution module. The signal acquisition module is connected to the intake pressure sensor, exhaust pressure sensor, fuel pressure sensor, etc. of the car engine through signal acquisition circuits to collect the output signals of each pressure sensor in real time. These signal acquisition circuits use high-precision analog-to-digital converters to ensure that the analog signals output by the sensors can be accurately converted into digital signals for subsequent processing.

[0032] The signal judgment module and fault analysis module can be integrated into the engine control unit (ECU), utilizing the ECU's powerful computing and data storage capabilities for signal judgment and fault analysis. The signal filtering submodule in the processing execution module can employ digital filters, such as finite impulse response (FIR) filters or infinite impulse response (IIR) filters, to filter interference signals. The alarm issuance submodule can issue alarm signals via instrument panel indicator lights or a buzzer to alert the driver. The fault code recording submodule stores fault codes in the ECU's non-volatile memory for subsequent troubleshooting by maintenance personnel. The parameter adjustment submodule can attempt to restore normal sensor function by adjusting engine control parameters such as injection timing and ignition advance angle.

[0033] The method for diagnosing interference and jamming in automotive engine pressure sensors provided by this invention includes the following steps: Real-time acquisition of the output signal from the automotive engine pressure sensor.

[0034] Based on a preset normal signal range, determine whether the output signal is within the normal range.

[0035] If the output signal exceeds the normal range, further analyze the signal characteristics to determine whether it is an interference or jamming fault.

[0036] Take appropriate measures based on the type of fault.

[0037] The real-time acquisition of the output signal of the automotive engine pressure sensor includes acquiring the output signal of at least one of the pressure sensors: intake pressure sensor, exhaust pressure sensor, and fuel pressure sensor.

[0038] The preset normal signal range is calculated based on a large amount of experimental data and engine models, according to different engine operating conditions.

[0039] The further analysis of signal characteristics to determine whether it is interference or a jamming fault specifically includes: If the output signal exhibits high-frequency fluctuations and the fluctuation amplitude exceeds the normal range, but the duration is short, it is determined to be an interference fault. If the output signal remains at a fixed value or fluctuates within a very small range for a long time and does not match the current engine operating conditions, it is determined to be a jamming fault.

[0040] The corresponding handling measures based on the fault type include: For interference faults, start the signal filtering program to filter the sensor output signal to eliminate interference signals; For stuck faults, issue an alarm signal to remind the driver and record the fault code. At the same time, you can try to restore the normal operation of the sensor by adjusting the engine control parameters.

[0041] In practice, the specific diagnostic procedure is as follows: Signal acquisition phase The signal acquisition module collects the output signals of each pressure sensor at a certain sampling frequency (e.g., 100 times per second). For example, the intake pressure sensor collects the pressure signal in the engine intake manifold, the exhaust pressure sensor collects the pressure signal in the exhaust system, and the fuel pressure sensor collects the pressure signal in the fuel line. After the collected signals are amplified, filtered, and preprocessed by the signal conditioning circuit, they are converted into digital signals and transmitted to the signal judgment module.

[0042] Signal Judgment Stage The signal determination module retrieves the corresponding normal signal range from its stored normal signal range database, based on the current engine operating conditions (such as engine speed, throttle opening, etc.). For example, under engine idling conditions, the normal output signal range of the intake pressure sensor might be 20kPa-50kPa. The module then compares the acquired sensor output signal with this normal range to determine whether the signal falls within the normal range.

[0043] Fault Analysis Phase If the sensor output signal exceeds the normal range, the fault analysis module begins analyzing the signal characteristics. For interference faults, the signal characteristic analysis unit detects high-frequency fluctuations in the output signal (e.g., frequency higher than 100Hz) and fluctuation amplitudes exceeding the normal range (e.g., fluctuation amplitude exceeding ±20% of the normal signal range), but with a short duration (e.g., less than 1 second), which is then identified as an interference fault. For jamming faults, if the output signal remains at a fixed value or fluctuates within a very small range for a long time (e.g., more than 5 seconds), and the fluctuation amplitude is less than ±5% of the normal signal range, and does not match the current engine operating conditions, it is identified as a jamming fault.

[0044] Processing execution phase For interference faults, the signal filtering submodule of the processing module activates a digital filter to filter the sensor output signal. For example, an FIR filter can be used, with appropriate filter coefficients set to remove high-frequency interference signals and retain useful pressure signals. For stuck faults, the alarm issuance submodule alerts the driver by flashing indicator lights on the instrument panel or sounding an alarm. Simultaneously, the fault code recording submodule stores the stuck fault code (e.g., P0107 indicating an intake pressure sensor stuck fault) in the ECU's non-volatile memory. The parameter adjustment submodule can attempt to adjust engine control parameters, such as appropriately increasing the injection timing or adjusting the ignition advance angle, to observe whether the sensor output signal returns to normal. If the adjustment fails to restore normal operation, the driver is advised to visit a repair shop as soon as possible.

[0045] The above systems and methods enable timely and accurate diagnosis of interference and jamming faults in automotive engine pressure sensors, allowing for the implementation of corresponding measures to ensure normal engine operation and vehicle safety.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for diagnosing interference and jamming in automotive engine pressure sensors, characterized in that, Includes the following steps: Real-time acquisition of the output signal from the automotive engine pressure sensor; Based on a preset normal signal range, determine whether the output signal is within the normal range; If the output signal exceeds the normal range, further analyze the signal characteristics to determine whether it is an interference or jamming fault. Take appropriate measures based on the type of fault.

2. The method for diagnosing interference and jamming in automotive engine pressure sensors according to claim 1, characterized in that, The real-time acquisition of the output signal of the automotive engine pressure sensor includes acquiring the output signal of at least one of the pressure sensors: intake pressure sensor, exhaust pressure sensor, and fuel pressure sensor.

3. The method for diagnosing interference and jamming in automotive engine pressure sensors according to claim 1, characterized in that, The preset normal signal range is calculated based on a large amount of experimental data and engine models, according to different engine operating conditions.

4. The method for diagnosing interference and jamming in an automotive engine pressure sensor according to claim 1, characterized in that, The further analysis of signal characteristics to determine whether it is interference or a jamming fault specifically includes: If the output signal exhibits high-frequency fluctuations and the fluctuation amplitude exceeds the normal range, but the duration is short, it is determined to be an interference fault. If the output signal remains at a fixed value or fluctuates within a very small range for a long time and does not match the current engine operating conditions, it is determined to be a jamming fault.

5. The method for diagnosing interference and jamming in an automotive engine pressure sensor according to claim 1, characterized in that, The corresponding handling measures based on the fault type include: For interference faults, start the signal filtering program to filter the sensor output signal to eliminate interference signals; For stuck faults, issue an alarm signal to remind the driver and record the fault code. At the same time, you can try to restore the normal operation of the sensor by adjusting the engine control parameters.

6. A system for implementing the diagnostic method for interference and jamming of an automotive engine pressure sensor according to any one of claims 1-5, characterized in that, include: The signal acquisition module is used to acquire the output signal of the automotive engine pressure sensor in real time. The signal judgment module determines whether the output signal is within the normal range based on a preset normal signal range. The fault analysis module, if the output signal exceeds the normal range, further analyzes the signal characteristics to determine whether it is an interference or jamming fault. The processing and execution module takes appropriate measures based on the type of fault.

7. The automotive engine pressure sensor interference and jamming diagnostic system according to claim 6, characterized in that, The signal acquisition module includes a signal acquisition circuit connected to the intake pressure sensor, exhaust pressure sensor, and fuel pressure sensor, used to accurately acquire the output signals of each pressure sensor.

8. The automotive engine pressure sensor interference and jamming diagnostic system according to claim 6, characterized in that, The signal judgment module stores a database of normal signal ranges determined according to different engine operating conditions, and makes judgments by comparing the sensor output signals with the corresponding values ​​in the database.

9. The automotive engine pressure sensor interference and jamming diagnostic system according to claim 6, characterized in that, The fault analysis module includes a signal feature analysis unit, which is used to perform high-frequency fluctuation analysis and duration analysis on output signals that exceed the normal range, in order to distinguish between interference faults and jamming faults.

10. The automotive engine pressure sensor interference and jamming diagnostic system according to claim 6, characterized in that, The processing execution module includes a signal filtering submodule, an alarm issuing submodule, a fault code recording submodule, and a parameter adjustment submodule, which are used to handle interference faults, issue alarms, record fault codes, and attempt to restore the sensor to normal operation, respectively.