Method and apparatus for detecting fault in rotational speed sensor

Abstract

A method for detecting a fault in a rotational speed sensor, comprising: acquiring a working current and current rotational speed information of a rotational speed sensor (S101); on the basis of the working current and the current rotational speed information, determining a fault state of the rotational speed sensor (S102), the fault state of the rotational speed sensor comprising at least two fault types; and, on the basis of the fault state of the rotational speed sensor, adjusting an operating state of an engine (S103). Further provided is an apparatus for detecting a fault in a rotational speed sensor.

Description

Fault detection method and device for speed sensor

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on October 30, 2023, with application number 202311423327.5, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of fault detection, for example, to a method and device for detecting a fault of a rotational speed sensor. Background Art

[0003] An engine speed sensor is configured to acquire an engine speed signal, a fundamental parameter required for engine operation. This signal is used to maintain engine operation and, during gear shifts, regulate oil pressure and delay ignition to mitigate shift shock. However, prior art monitoring of speed sensors often fails to classify sensor failures, leading to delayed troubleshooting and impacting vehicle safety. Therefore, a detection method capable of classifying and addressing speed sensor failures is needed.

[0004] Summary of the Invention

[0005] The present application provides a method and device for detecting faults of a rotational speed sensor, so as to avoid the situation in the related art where faults of the rotational speed sensor are not handled in a timely manner.

[0006] According to one aspect of the present application, a method for detecting a fault of a rotational speed sensor is provided, comprising:

[0007] Get the operating current and current speed information of the speed sensor;

[0008] Determine the fault state of the speed sensor according to the operating current and the current speed information; wherein the fault state of the speed sensor includes at least two fault types;

[0009] Adjust the engine's operating state according to the fault state of the speed sensor.

[0010] In a second aspect, an embodiment of the present application provides a fault detection device for a rotation speed sensor, comprising:

[0011] An acquisition module is configured to obtain the operating current and current speed information of the speed sensor;

[0012] a determination module configured to determine a fault state of the speed sensor based on the operating current and current speed information; wherein the fault state of the speed sensor includes at least two fault types;

[0013] The regulating module is configured to regulate the operating state of the engine according to the fault state of the speed sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG1 is a flow chart of a method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application;

[0015] FIG2 is a flow chart of another method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application;

[0016] FIG3 is a flow chart of another method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application;

[0017] FIG4 is a flow chart of another method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application;

[0018] FIG5 is a flow chart of another method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application;

[0019] FIG6 is a flow chart of another method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application;

[0020] FIG7 is a flow chart of another method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application;

[0021] FIG8 is a flow chart of another method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application;

[0022] FIG9 is a flow chart of another method for detecting a fault of a speed sensor provided in an embodiment of the present application;

[0023] FIG10 is a flow chart of another method for detecting a fault of a speed sensor provided in an embodiment of the present application;

[0024] FIG11 is a schematic structural diagram of a fault detection device for a rotation speed sensor provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0026] FIG1 is a flow chart of a method for detecting a fault of a rotational speed sensor according to an embodiment of the present application. Referring to FIG1 , the method for detecting a fault of a rotational speed sensor according to an embodiment of the present application includes:

[0027] S101: Obtain operating current and current speed information of a speed sensor.

[0028] While a car is driving, the speed sensor acquires the engine speed signal to maintain engine operation. By obtaining the operating current and speed information during the operation of the speed sensor, the operating status of the speed sensor can be determined, thereby determining whether the speed sensor is faulty.

[0029] S102: Determine the fault state of the speed sensor according to the operating current and the current speed information.

[0030] The fault state of the rotation speed sensor includes at least two fault types.

[0031] Based on the speed sensor's operating current and speed information during operation, its fault status can be determined. Fault conditions can include short circuit, open circuit, unreliable speed value, and abnormal direction. Determining the sensor's fault status allows for appropriate adjustments, thereby improving engine safety.

[0032] S103: Adjust the operating state of the engine according to the fault state of the speed sensor.

[0033] When a speed sensor fails, the engine's operating status may be affected. Based on the sensor's current fault status, the sensor and other engine modules can be tampered with to restore normal operation. This in turn adjusts the engine's operating status and improves engine safety.

[0034] For example, while the vehicle is in motion, the fault handling system obtains the operating current and speed information of the speed sensor during operation and determines the speed sensor's fault status based on this information. When the speed sensor fails, the engine's operating state is affected. Based on the speed sensor's current fault status, the fault handling system performs corresponding processing on the speed sensor and other modules within the engine, restoring normal operation of the speed sensor and, consequently, the engine.

[0035] The speed sensor fault detection method provided in this embodiment determines the fault state of the speed sensor by obtaining the operating current and current speed information of the speed sensor, and adjusts the speed sensor and other modules in the engine accordingly to adjust the operating state of the engine and improve the safety of engine operation.

[0036] FIG2 is a flow chart of another method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application. Based on the above embodiment, referring to FIG2 , the method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application includes:

[0037] S101: Acquire operating current and speed information of a speed sensor.

[0038] S201: Determine, based on the operating current of the speed sensor, that the fault type of the speed sensor is an electrical fault.

[0039] The speed sensor's operating current can be used to determine if the sensor has an electrical fault. When operating normally, the sensor's operating current remains stable near the rated current. If the sensor's operating current continuously fluctuates or exceeds the rated current, it indicates an electrical fault, such as a short circuit or open circuit, in the sensor.

[0040] S202: Determine, based on current speed information of the speed sensor, that the fault type of the speed sensor is an unreliable speed value fault.

[0041] The current speed information from the speed sensor can be used to determine whether the speed sensor has experienced an unreliable speed value fault. When operating normally, the speed sensor outputs a speed signal containing speed information based on the engine's operating status. If the current speed information from the speed sensor deviates significantly from the speed information calculated based on vehicle speed, it can be confirmed that the speed sensor has experienced an unreliable speed value fault.

[0042] S203: Determine, based on the direction signal of the anti-lock braking system and the current speed information of the speed sensor, that the fault type of the speed sensor is a direction abnormality fault.

[0043] The current speed information from the speed sensor can also be used to determine whether the speed sensor has a directional error. When operating normally, the speed signal output by the speed sensor is in the same direction as the directional signal output by the anti-lock braking system. If the direction of the speed sensor's speed signal is opposite to the direction of the directional signal output by the anti-lock braking system, a directional error has occurred in the speed sensor.

[0044] S103: Adjust the operating state of the engine according to the fault state of the speed sensor.

[0045] FIG3 is a flow chart of another method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application. Based on the above embodiment, referring to FIG3 , the method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application includes:

[0046] S101: Acquire operating current and speed information of a speed sensor.

[0047] S301 : When the operating current of the speed sensor is less than a first preset current value, determine that the speed sensor has an open circuit fault or a short circuit fault to ground.

[0048] The first preset current value can be the minimum normal operating current of the speed sensor. When the speed sensor's operating current is less than the first preset current value, the current in the speed sensor becomes unstable and the voltage approaches zero. This indicates an open circuit or short-circuit fault in the speed sensor. The fault handling system may experience abnormal data readings from the speed sensor or may be unable to read data at all.

[0049] S302: When the operating current of the speed sensor is greater than a second preset current value, it is determined that a short circuit fault occurs in the speed sensor to the power supply.

[0050] The second preset current value is greater than the first preset current value.

[0051] The second preset current value may be the maximum normal operating current of the speed sensor. When the operating current of the speed sensor is greater than the second preset current value, the current of the speed sensor exceeds the normal operating state, and it can be determined that a power short circuit fault has occurred in the speed sensor.

[0052] S202: Determine, based on current speed information of the speed sensor, that the fault type of the speed sensor is an unreliable speed value fault.

[0053] S203: Determine, based on the direction signal of the anti-lock braking system and the current speed information of the speed sensor, that the fault type of the speed sensor is a direction abnormality fault.

[0054] S103: Adjust the operating state of the engine according to the fault state of the speed sensor.

[0055] FIG4 is a flow chart of another method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application. Based on the above embodiment, referring to FIG4 , the method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application includes:

[0056] S101: Acquire operating current and speed information of a speed sensor.

[0057] S201: Determine, based on the operating current of the speed sensor, that the fault type of the speed sensor is an electrical fault.

[0058] S401: Calculate first speed information of an output shaft speed sensor according to the speed of the vehicle.

[0059] A vehicle's speed sensors may include an output shaft speed sensor, an odd-numbered shaft speed sensor, and an even-numbered shaft speed sensor. Based on the current vehicle speed, the first speed information from the output shaft speed sensor can be reverse-calculated. This first speed information is the speed information that the output shaft speed sensor should output corresponding to the current vehicle speed. This first speed information can be used to determine whether the output shaft speed sensor has experienced an unreliable speed value fault.

[0060] S402 : Calculate second speed information of the output shaft speed sensor according to the current speed information of the odd-numbered shaft speed sensor and the current speed information of the even-numbered shaft speed sensor.

[0061] Based on the current speed information from the odd-shaft speed sensor and the current speed information from the even-shaft speed sensor, the second speed information of the output shaft speed sensor can be reversed. This second speed information is the speed information that the output shaft speed sensor should output, corresponding to the speed information currently output by the odd-shaft speed sensor and the even-shaft speed sensor. This second speed information can be used to determine whether the output shaft speed sensor has experienced an unreliable speed value fault.

[0062] S403 : Calculate third speed information of the output shaft speed sensor according to the current speed information of the odd-numbered shaft speed sensor.

[0063] The third speed information of the output shaft speed sensor can be reverse-calculated based on the current speed information of the odd-shaft speed sensor. This third speed information is the speed information that the output shaft speed sensor should output, corresponding to the speed information currently output by the odd-shaft speed sensor. This third speed information can be used to determine whether the odd-shaft speed sensor has experienced an unreliable speed value fault.

[0064] S404 : Calculate fourth speed information of the output shaft speed sensor according to the current speed information of the even-numbered shaft speed sensor.

[0065] Based on the current speed information from the even-shaft speed sensor, the fourth speed information of the output shaft speed sensor can be reversed. This fourth speed information is the speed information that the output shaft speed sensor should output, corresponding to the speed information currently output by the even-shaft speed sensor. This fourth speed information can be used to determine whether the even-shaft speed sensor has experienced an unreliable speed value fault.

[0066] S405. According to the first speed information, the second speed information, the third speed information, the fourth speed information, the current speed information of the output shaft speed sensor, the current speed information of the odd shaft speed sensor, and the current speed information of the even shaft speed sensor, it is determined that the fault type of the output shaft speed sensor, the odd shaft speed sensor, and the even shaft speed sensor is an unreliable speed value fault.

[0067] The speed sensors include an output shaft speed sensor, an odd-numbered shaft speed sensor, and an even-numbered shaft speed sensor. The current speed information of the speed sensors includes the current speed information of the output shaft speed sensor, the current speed information of the odd-numbered shaft speed sensor, and the current speed information of the even-numbered shaft speed sensor.

[0068] The first, second, third, and fourth speed information can be compared with the current speed information of the output shaft speed sensor, the odd-numbered shaft speed sensor, and the even-numbered shaft speed sensor to determine whether the output shaft speed sensor, the odd-numbered shaft speed sensor, or the even-numbered shaft speed sensor has experienced an unreliable speed value fault. This configuration improves the accuracy of fault diagnosis and facilitates appropriate handling, thereby enhancing engine operating safety.

[0069] S203: Determine, based on the direction signal of the anti-lock braking system and the current speed information of the speed sensor, that the fault type of the speed sensor is a direction abnormality fault.

[0070] S103: Adjust the operating state of the engine according to the fault state of the speed sensor.

[0071] FIG5 is a flow chart of another method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application. Based on the above embodiment, referring to FIG5 , the method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application includes:

[0072] S101: Acquire operating current and speed information of a speed sensor.

[0073] S201: Determine, based on the operating current of the speed sensor, that the fault type of the speed sensor is an electrical fault.

[0074] S401: Calculate first speed information of an output shaft speed sensor according to the speed of the vehicle.

[0075] S402 : Calculate second speed information of the output shaft speed sensor according to current speed information of the odd-numbered shaft speed sensor and the even-numbered shaft speed sensor.

[0076] S403 : Calculate third speed information of the output shaft speed sensor according to the current speed information of the odd-numbered shaft speed sensor.

[0077] S404 : Calculate fourth speed information of the output shaft speed sensor according to the current speed information of the even-numbered shaft speed sensor.

[0078] S501: When the output shaft speed sensor satisfies the first judgment condition and the second judgment condition, it is determined that the output shaft speed sensor has a speed value unreliable fault.

[0079] The first judgment condition is that a first speed difference between the current speed information of the output shaft speed sensor and the first speed information is greater than a first preset speed value, and the first speed difference is greater than the product of the current speed information of the output shaft speed sensor and the first preset value. The second judgment condition is that a second speed difference between the current speed information of the output shaft speed sensor and the second speed information is greater than the first preset speed value, and the second speed difference is greater than the product of the current speed information of the output shaft speed sensor and the first preset value.

[0080] When the vehicle is driving on a non-low-adhesion road, is not shifting gears, the throttle is between 0-70%, and the vehicle speed is greater than 10 km / h:

[0081] When a first speed difference between the current speed information of the output shaft speed sensor and the first speed information is greater than a first preset speed value, and the first speed difference is greater than the product of the current speed information of the output shaft speed sensor and the first preset value, and a second speed difference between the current speed information of the output shaft speed sensor and the second speed information is greater than the first preset speed value, and the second speed difference is greater than the product of the current speed information of the output shaft speed sensor and the first preset value, and the above situation lasts for more than 2 seconds;

[0082] At this point, there's a significant discrepancy between the output shaft speed sensor's speed information, the first speed information calculated based on the vehicle's current speed, and the second speed information calculated based on the odd- and even-axle speed sensors. Therefore, it can be determined that the output shaft speed sensor has experienced a speed error.

[0083] For example, when the preset speed value is 180 rpm and the first preset value is 10%, it can be considered that the error between the calculated output value and the actual output value of the output shaft speed sensor exceeds 180 rpm and 10%, that is, a speed value unreliable fault occurs.

[0084] S601: When the odd-axis speed sensor meets the third judgment condition and the fourth judgment condition, it is determined that the odd-axis speed sensor has an unreliable speed value fault.

[0085] The third judgment condition is that a third speed difference between the current speed information of the output shaft speed sensor and the third speed information is greater than a first preset speed value, and the third speed difference is greater than the product of the current speed information of the odd-numbered shaft speed sensor and the first preset value. The fourth judgment condition is that a fourth speed difference between the current speed information of the odd-numbered shaft speed sensor and the first speed information is greater than the first preset speed value, and the fourth speed difference is greater than the product of the first speed information and the first preset value.

[0086] When the vehicle is driving on a non-low-adhesion road, is not shifting gears, the throttle is between 0-70%, and the vehicle speed is greater than 10 km / h:

[0087] When a third speed difference between the current speed information of the output shaft speed sensor and the third speed information is greater than the first preset speed value, and the third speed difference is greater than the product of the current speed information of the odd-numbered shaft speed sensor and the first preset value, and a fourth speed difference between the current speed information of the odd-numbered shaft speed sensor and the first speed information is greater than the first preset speed value, and the fourth speed difference is greater than the product of the first speed information and the first preset value, and the above situation lasts for more than 2 seconds;

[0088] At this time, the third speed information calculated from the odd-axis speed sensor has a large error with the first speed information and the speed information output by the output shaft speed sensor. Therefore, it can be determined that the odd-axis speed sensor has an unreliable speed value fault.

[0089] S701: When the even-numbered shaft speed sensor meets the fifth and sixth judgment conditions, determine that the even-numbered shaft speed sensor has an unreliable speed value fault.

[0090] The fifth judgment condition is that a fifth speed difference between the current speed information of the output shaft speed sensor and the fourth speed information is greater than a first preset speed value, and the fifth speed difference is greater than the product of the current speed information of the even-numbered shaft speed sensor and the first preset value. The sixth judgment condition is that a sixth speed difference between the current speed information of the even-numbered shaft speed sensor and the first speed information is greater than the first preset speed value, and the sixth speed difference is greater than the product of the first speed information and the first preset value.

[0091] When the vehicle is driving on a non-low-adhesion road, is not shifting gears, the throttle is between 0-70%, and the vehicle speed is greater than 10 km / h:

[0092] When a fifth speed difference between the current speed information of the output shaft speed sensor and the fourth speed information is greater than the first preset speed value, and the fifth speed difference is greater than the product of the current speed information of the even-numbered shaft speed sensor and the first speed information and a sixth speed difference between the current speed information of the even-numbered shaft speed sensor and the first speed information is greater than the first preset speed value, and the sixth speed difference is greater than the product of the first speed information and the first preset value, and the above situation lasts for more than 2 seconds;

[0093] At this time, the fourth speed information calculated from the even-numbered shaft speed sensor has a large error with the first speed information and the speed information output by the output shaft speed sensor. Therefore, it can be determined that the even-numbered shaft speed sensor has an unreliable speed value fault.

[0094] S203: Determine, based on the direction signal of the anti-lock braking system and the current speed information of the speed sensor, that the fault type of the speed sensor is a direction abnormality fault.

[0095] S103: Adjust the operating state of the engine according to the fault state of the speed sensor.

[0096] FIG6 is a flow chart of another method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application. Based on the above embodiment, referring to FIG6 , the method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application includes:

[0097] S101: Acquire operating current and speed information of a speed sensor.

[0098] S201: Determine, based on the operating current of the speed sensor, that the fault type of the speed sensor is an electrical fault.

[0099] S202: Determine, based on current speed information of the speed sensor, that the fault type of the speed sensor is an unreliable speed value fault.

[0100] S801. When the direction signal of the anti-lock braking system and the pulse signal output by the speed sensor are in normal state, if the pulse signal output by the speed sensor is opposite to the direction signal of the anti-lock braking system within a preset time period, it is determined that an abnormal direction fault occurs in the speed sensor.

[0101] During vehicle driving, when the pulse signal output by the speed sensor is normal, the vehicle speed and the non-driven wheel speed are greater than 1 km / h, and the direction signal from the anti-lock braking system is normal, if the fault handling system detects within a preset time period that the direction of the pulse signal output by the speed sensor is opposite to the direction signal from the anti-lock braking system, the fault handling system may determine that the speed sensor has a direction abnormality, i.e., a speed sensor direction abnormality fault has occurred. For example, the preset time period may be 3 seconds.

[0102] If the pulse signal of the speed sensor outputs abnormally or stops outputting within a preset time period, the fault handling system may also determine that the speed sensor has a direction abnormality fault.

[0103] S103: Adjust the operating state of the engine according to the fault state of the speed sensor.

[0104] FIG7 is a flow chart of another method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application. Based on the above embodiment, referring to FIG7 , the method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application includes:

[0105] S101: Acquire operating current and speed information of a speed sensor.

[0106] S301 : When the operating current of the speed sensor is less than a first preset current value, determine that the speed sensor has an open circuit fault or a short circuit fault to ground.

[0107] S302: When the operating current of the speed sensor is greater than a second preset current value, it is determined that a short circuit fault occurs in the speed sensor to the power supply.

[0108] S202: Determine, based on current speed information of the speed sensor, that the fault type of the speed sensor is an unreliable speed value fault.

[0109] S203: Determine, based on the direction signal of the anti-lock braking system and the current speed information of the speed sensor, that the fault type of the speed sensor is a direction abnormality fault.

[0110] S901: When the fault type of the speed sensor is an open circuit fault, a short circuit to ground fault, or a power short circuit fault, disable the speed sensor and replace the current speed information of the speed sensor with historical speed information.

[0111] The historical speed information includes speed information within a preset historical time period when the speed sensor is in a normal state.

[0112] If a speed sensor experiences an open circuit, short to ground, or short to power, the fault handling system disables the faulty sensor and replaces its current speed information with historical speed information. This replaces the speed information output by the faulty sensor with the speed information last output when the sensor was operating normally. This allows for tailored handling of the sensor based on the fault type, improving engine safety.

[0113] FIG8 is a flow chart of another method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application. Based on the above embodiment, referring to FIG8 , the method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application includes:

[0114] S101: Acquire operating current and speed information of a speed sensor.

[0115] S201: Determine, based on the operating current of the speed sensor, that the fault type of the speed sensor is an electrical fault.

[0116] S401: Calculate first speed information of an output shaft speed sensor according to the speed of the vehicle.

[0117] S402 : Calculate second speed information of the output shaft speed sensor according to current speed information of the odd-numbered shaft speed sensor and the even-numbered shaft speed sensor.

[0118] S403 : Calculate third speed information of the output shaft speed sensor according to the current speed information of the odd-numbered shaft speed sensor.

[0119] S404 : Calculate fourth speed information of the output shaft speed sensor according to the current speed information of the even-numbered shaft speed sensor.

[0120] S501: When the output shaft speed sensor satisfies the first judgment condition and the second judgment condition, it is determined that the output shaft speed sensor has a speed value unreliable fault.

[0121] S601: When the odd-axis speed sensor meets the third judgment condition and the fourth judgment condition, it is determined that the odd-axis speed sensor has an unreliable speed value fault.

[0122] S701: When the even-numbered shaft speed sensor meets the fifth and sixth judgment conditions, determine that the even-numbered shaft speed sensor has an unreliable speed value fault.

[0123] S203: Determine, based on the direction signal of the anti-lock braking system and the current speed information of the speed sensor, that the fault type of the speed sensor is a direction abnormality fault.

[0124] S110: When the fault type of the speed sensor is a speed value unreliable fault, disable the speed sensor and replace the current speed information of the speed sensor with historical speed information.

[0125] When a speed sensor has a speed value unreliable fault, the fault handling system will disable the faulty speed sensor and replace the current speed information of the faulty speed sensor with historical speed information.

[0126] S111 . When the fault type of the output shaft speed sensor is a speed value unreliable fault, replace the next speed information output by the output shaft speed sensor with the first speed information.

[0127] When an output shaft speed sensor experiences an unreliable speed value fault, the fault handling system first disables the output shaft speed sensor and replaces the current speed information with historical speed information. The fault handling system then replaces the next speed information output with the first speed information calculated based on vehicle speed. If the output shaft speed sensor's pulse signal output is abnormal, the fault handling system replaces the default speed information output by the output shaft speed sensor with 0.

[0128] S112: When the fault type of the odd-numbered shaft speed sensor and / or the even-numbered shaft speed sensor is an unreliable speed value fault, the next speed information output by the failed speed sensor is replaced with the current speed information of the output shaft speed sensor.

[0129] When an unreliable speed value fault occurs in the odd-axis speed sensor and / or the even-axis speed sensor, the fault handling system will first disable the faulty speed sensor and replace the current speed information of the faulty speed sensor with the historical speed information. Then, the fault handling system will replace the next output speed information with the current speed information of the output shaft speed sensor. If the pulse signal output of the odd-axis speed sensor and / or the even-axis speed sensor is abnormal, the fault handling system will replace the speed information output by the odd-axis speed sensor and / or the even-axis speed sensor with the engine speed value. This setting can perform corresponding processing on the speed sensor according to the fault type of the speed sensor, thereby improving the safety of engine operation.

[0130] FIG9 is a flow chart of another method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application. Based on the above embodiment, referring to FIG9 , the method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application includes:

[0131] S101: Acquire operating current and speed information of a speed sensor.

[0132] S201: Determine, based on the operating current of the speed sensor, that the fault type of the speed sensor is an electrical fault.

[0133] S202: Determine, based on current speed information of the speed sensor, that the fault type of the speed sensor is an unreliable speed value fault.

[0134] S801: When the direction signal of the anti-lock braking system and the speed sensor are in normal state, if the pulse signal of the speed sensor is opposite to the direction signal of the anti-lock braking system within a preset time period, it is determined that the speed sensor has a direction abnormality fault.

[0135] S120: When the fault type of the speed sensor is a direction abnormality fault, replace the current speed information of the speed sensor with historical speed information, and replace the direction of the speed sensor with the direction of the anti-lock braking system.

[0136] When a speed sensor experiences a direction error, the fault handling system disables the faulty sensor and replaces its current speed information with historical speed information. The system also replaces the speed sensor's direction with the anti-lock braking system's direction. If the anti-lock braking system's direction is abnormal, the system determines the current direction based on the vehicle's handlebars. This allows for tailored handling of the speed sensor based on the fault type, improving engine safety.

[0137] FIG10 is a flow chart of another method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application. Based on the above embodiment, referring to FIG10 , the method for detecting a fault of a rotational speed sensor provided in an embodiment of the present application includes:

[0138] S101: Acquire operating current and speed information of a speed sensor.

[0139] S201: Determine, based on the operating current of the speed sensor, that the fault type of the speed sensor is an electrical fault.

[0140] S202: Determine, based on current speed information of the speed sensor, that the fault type of the speed sensor is an unreliable speed value fault.

[0141] S203: Determine, based on the direction signal of the anti-lock braking system and the current speed information of the speed sensor, that the fault type of the speed sensor is a direction abnormality fault.

[0142] S103 : When the fault type of the speed sensor is an open circuit fault, a short circuit to ground fault, or a power short circuit fault, the speed sensor is disabled, and the current speed information of the speed sensor is replaced with historical speed information.

[0143] S130. When the speed sensor has an electrical fault, an unreliable speed value fault, and / or an abnormal direction fault, an alarm signal is issued.

[0144] When the fault handling system detects a speed sensor electrical fault, an unreliable speed value fault, and / or an abnormal direction fault, and these faults persist for a certain period of time, it will issue a corresponding alarm signal to alert the driver. For example, the fault handling system may issue an alarm signal after the fault lasts for more than 50 milliseconds. This configuration can speed up the driver's response to speed sensor faults.

[0145] S131. Record the occurrence time and fault information of the electrical fault, the unreliable speed value fault, and / or the abnormal direction fault.

[0146] After the fault handling system issues an alarm, it also stores the occurrence time and fault information of electrical faults, unreliable speed value faults, and / or abnormal direction faults in a storage unit for easy access by maintenance personnel. This configuration facilitates vehicle maintenance and improves vehicle safety.

[0147] For example, while the vehicle is driving, the fault handling system obtains operating current and speed information from the speed sensor during operation. It then calculates first, second, third, and fourth speed information based on the vehicle speed, the current speed information from the output shaft speed sensor, the odd-numbered shaft speed sensor, and the even-numbered shaft speed sensor. The fault handling system determines the fault status of the speed sensor based on the operating current and speed information.

[0148] When the speed sensor's operating current is less than a first preset current value, the sensor is determined to have an open circuit fault or a short circuit to ground fault. When the speed sensor's operating current is greater than a second preset current value, the sensor is determined to have a power supply short circuit fault. The fault handling system disables the faulty speed sensor and replaces its speed information with historical speed information. Simultaneously, the fault handling system issues an alarm signal and stores the fault occurrence time and fault information in a storage unit.

[0149] When the first speed difference between the current speed information of the output shaft speed sensor and the first speed information is greater than the first preset speed value, and the first speed difference is greater than the product of the current speed information of the output shaft speed sensor and the first preset value, and the second speed difference between the current speed information of the output shaft speed sensor and the second speed information is greater than the first preset speed value, and the second speed difference is greater than the product of the current speed information of the output shaft speed sensor and the first preset value, and the above situation lasts for more than 2s, it is determined that an unreliable speed value fault has occurred in the output shaft speed sensor.

[0150] When the third speed difference between the current speed information of the output shaft speed sensor and the third speed information is greater than the first preset speed value, and the third speed difference is greater than the product of the current speed information of the odd shaft speed sensor and the first preset value, and the fourth speed difference between the current speed information of the odd shaft speed sensor and the first speed information is greater than the first preset speed value, and the fourth speed difference is greater than the product of the first speed information and the first preset value, and the above situation lasts for more than 2s, it is determined that the odd shaft speed sensor has an unreliable speed value failure.

[0151] When the fifth speed difference between the current speed information of the output shaft speed sensor and the fourth speed information is greater than the first preset speed value, and the fifth speed difference is greater than the product of the current speed information of the even shaft speed sensor and the first preset value, and the sixth speed difference between the current speed information of the even shaft speed sensor and the first speed information is greater than the first preset speed value, and the sixth speed difference is greater than the product of the first speed information and the first preset value, and the above situation lasts for more than 2s, it is determined that an unreliable speed value failure has occurred in the even shaft speed sensor.

[0152] When a speed sensor has a speed value unreliable fault, the fault handling system will disable the faulty speed sensor and replace the current speed information of the faulty speed sensor with historical speed information.

[0153] When an output shaft speed sensor experiences an unreliable speed value fault, the fault handling system first disables the output shaft speed sensor and replaces the output shaft speed sensor's current speed information with historical speed information. The fault handling system then replaces the next output speed information with the first speed information.

[0154] When an unreliable speed value fault occurs in the odd-shaft speed sensor and / or the even-shaft speed sensor, the fault handling system first disables the faulty speed sensor and replaces the current speed information of the faulty speed sensor with historical speed information. The fault handling system then replaces the next output speed information with the current speed information of the output shaft speed sensor. If the pulse signal output of the odd-shaft speed sensor and / or the even-shaft speed sensor is abnormal, the fault handling system replaces the speed information output by the odd-shaft speed sensor and / or the even-shaft speed sensor with the engine speed value. At the same time, the fault handling system issues an alarm signal and stores the time of the fault occurrence and the fault information in a storage unit.

[0155] When the pulse signal output by the speed sensor is normal, the vehicle speed and the non-drive wheel speed are greater than 1 km / h, and the direction signal of the anti-lock braking system is normal, if the fault handling system detects that the direction of the pulse signal output by the speed sensor is opposite to the direction signal of the anti-lock braking system within a preset time period, it is determined that the direction of the speed sensor is abnormal.

[0156] When a speed sensor experiences a direction error, the fault handling system disables the faulty sensor and replaces its current speed information with historical speed information. The system also replaces the speed sensor's direction with the anti-lock braking system's direction. If the anti-lock braking system's direction is abnormal, the system determines the current direction based on the vehicle's handlebars. Simultaneously, the system issues an alarm and stores the fault's occurrence time and fault information in a storage unit.

[0157] When a speed sensor fails, the engine's operating state is affected. After the fault handling system performs corresponding processing on the speed sensor and other modules within the engine, the speed sensor and the engine are restored to normal operation.

[0158] FIG11 is a schematic diagram of the structure of a rotation speed sensor fault detection device provided in an embodiment of the present application. Based on the above embodiment, referring to FIG11 , the rotation speed sensor fault detection device 10 provided in an embodiment of the present application includes:

[0159] An acquisition module 11 is configured to acquire operating current and speed information of a speed sensor;

[0160] The determination module 12 is configured to determine a fault state of the speed sensor according to the operating current and the speed information; wherein the fault state of the speed sensor includes at least two fault types;

[0161] The regulating module 13 is configured to regulate the operating state of the engine according to the fault state of the speed sensor.

[0162] The speed sensor fault detection device of the embodiment of the present application obtains the operating current and speed information of the speed sensor and determines the fault state of the speed sensor based on the operating current and speed information. The operating state of the engine is adjusted based on the fault state of the speed sensor. The technical solution of the embodiment of the present application determines the fault state by obtaining the operating current and speed information of the speed sensor and then adjusts the operating state of the engine, thereby implementing corresponding fault processing according to the corresponding fault category and improving the safety of vehicle operation.

[0163] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the multiple steps described in this application can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of this application can be achieved. This is not limited herein.

Claims

1. A method for detecting a fault of a rotation speed sensor, comprising: Get the operating current and current speed information of the speed sensor; Determine the fault state of the speed sensor according to the working current and the current speed information; wherein the fault state of the speed sensor includes at least two fault types; The operating state of the engine is adjusted according to the fault state of the rotation speed sensor.

2. The method according to claim 1, wherein: The determining the fault state of the speed sensor according to the working current and the current speed information includes: Determining, according to the operating current of the speed sensor, that the fault type of the speed sensor is an electrical fault; According to the current speed information of the speed sensor, determining that the fault type of the speed sensor is a speed value unreliable fault; According to the direction signal of the anti-lock braking system and the current speed information of the speed sensor, it is determined that the fault type of the speed sensor is a direction abnormality fault.

3. The method according to claim 2, wherein: Determining, according to the working current, that the fault type of the rotation speed sensor is an electrical fault includes: In response to determining that the operating current is less than a first preset current value, determining that an open circuit fault or a short circuit fault to ground occurs in the rotation speed sensor; In response to determining that the operating current is greater than a second preset current value, determining that a short circuit fault to a power supply occurs in the rotation speed sensor; Wherein, the second preset current value is greater than the first preset current value.

4. The method according to claim 2, wherein: The speed sensor includes an output shaft speed sensor, an odd-numbered shaft speed sensor, and an even-numbered shaft speed sensor, and the current speed information of the speed sensor includes the current speed information of the output shaft speed sensor, the current speed information of the odd-numbered shaft speed sensor, and the current speed information of the even-numbered shaft speed sensor. The determining, according to the current speed information of the speed sensor, that the fault type of the speed sensor is a speed value unreliable fault includes: Calculating first speed information of the output shaft speed sensor according to the speed of the vehicle; Calculating second speed information of the output shaft speed sensor according to the current speed information of the odd-numbered shaft speed sensor and the current speed information of the even-numbered shaft speed sensor; Calculating third speed information of the output shaft speed sensor according to the current speed information of the odd-numbered shaft speed sensor; Calculating fourth speed information of the output shaft speed sensor according to the current speed information of the even-numbered shaft speed sensor; According to the first speed information, the second speed information, the third speed information, the fourth speed information, the current speed information of the output shaft speed sensor, the current speed information of the odd-numbered shaft speed sensor and the current speed information of the even-numbered shaft speed sensor, the output shaft speed sensor, the odd-numbered shaft speed sensor and the even-numbered shaft speed sensor are determined. The fault type of the even-numbered axis speed sensor is the speed value unreliable fault.

5. The method according to claim 4, wherein: The method of determining, based on the first speed information, the second speed information, the third speed information, the fourth speed information, the current speed information of the output shaft speed sensor, the current speed information of the odd-numbered shaft speed sensor, and the current speed information of the even-numbered shaft speed sensor, that the fault type of the output shaft speed sensor, the odd-numbered shaft speed sensor, and the even-numbered shaft speed sensor is a speed value unreliable fault comprises: According to the first speed information, the second speed information, and the current speed information of the output shaft sensor, determining that a speed value unreliable fault occurs in the output shaft speed sensor; The determining, based on the first speed information, the second speed information, and the current speed information of the output shaft speed sensor, that a speed value unreliable fault occurs in the output shaft speed sensor includes: In response to determining that the output shaft speed sensor satisfies the first judgment condition and the second judgment condition, determining that the output shaft speed sensor has a speed value unreliable fault; Wherein, the first judgment condition is that a first speed difference between the current speed information of the output shaft speed sensor and the first speed information is greater than a first preset speed value, and the first speed difference is greater than the product of the current speed information of the output shaft speed sensor and the first preset value; The second judgment condition is that a second speed difference between the current speed information of the output shaft speed sensor and the second speed information is greater than the first preset speed value, and the second speed difference is greater than the product of the current speed information of the output shaft speed sensor and the first preset value.

6. The method according to claim 5, wherein: The method of determining, based on the first speed information, the second speed information, the third speed information, the fourth speed information, the current speed information of the output shaft speed sensor, the current speed information of the odd-numbered shaft speed sensor, and the current speed information of the even-numbered shaft speed sensor, that the fault type of the output shaft speed sensor, the odd-numbered shaft speed sensor, and the even-numbered shaft speed sensor is a speed value unreliable fault comprises: Determining that an unreliable speed value fault occurs in the odd-numbered shaft speed sensor according to the first speed information, the third speed information, the current speed information of the output shaft sensor, and the current speed information of the odd-numbered shaft speed sensor; The determining, based on the first speed information, the third speed information, the current speed information of the output shaft sensor, and the current speed information of the odd-numbered shaft speed sensor, that the speed value of the odd-numbered shaft speed sensor has an unreliable speed value fault includes: In response to determining that the odd-numbered shaft speed sensor satisfies the third judgment condition and the fourth judgment condition, determining that the odd-numbered shaft speed sensor has a speed value unreliable fault; The third judgment condition is that a third speed difference between the current speed information of the output shaft speed sensor and the third speed information is greater than the first preset speed value, and the third speed difference is greater than the product of the current speed information of the odd-numbered shaft speed sensor and the first preset value; The fourth judgment condition is that a fourth speed difference between the current speed information of the odd-axis speed sensor and the first speed information is greater than the first preset speed value, and the fourth speed difference is greater than the first speed information and the first preset speed value. The product of the values.

7. The method according to claim 6, wherein: The method of determining, based on the first speed information, the second speed information, the third speed information, the fourth speed information, the current speed information of the output shaft speed sensor, the current speed information of the odd-numbered shaft speed sensor, and the current speed information of the even-numbered shaft speed sensor, that the fault type of the output shaft speed sensor, the odd-numbered shaft speed sensor, and the even-numbered shaft speed sensor is a speed value unreliable fault comprises: Determining that an unreliable speed value fault occurs in the even-numbered shaft speed sensor according to the first speed information, the fourth speed information, the current speed information of the output shaft sensor, and the current speed information of the even-numbered shaft speed sensor; The determining, based on the first speed information, the fourth speed information, the current speed information of the output shaft sensor, and the current speed information of the even-numbered shaft speed sensor, that a speed value unreliable fault occurs in the even-numbered shaft speed sensor comprises: In response to determining that the even-numbered shaft speed sensor satisfies the fifth judgment condition and the sixth judgment condition, determining that the even-numbered shaft speed sensor has a speed value unreliable fault; The fifth judgment condition is that a fifth speed difference between the current speed information of the output shaft speed sensor and the fourth speed information is greater than the first preset speed value, and the fifth speed difference is greater than the product of the current speed information of the even-numbered shaft speed sensor and the first preset value; The sixth judgment condition is that a sixth speed difference between the current speed information of the even-axis speed sensor and the first speed information is greater than the first preset speed value, and the sixth speed difference is greater than the product of the first speed information and the first preset value.

8. The method according to claim 2, wherein: The step of determining, based on the direction signal of the anti-lock braking system and the current speed information of the speed sensor, that the fault type of the speed sensor is a direction abnormality fault comprises: In response to determining that the direction signal of the anti-lock braking system and the pulse signal output by the speed sensor are in a normal state, and the direction of the pulse signal output by the speed sensor is opposite to the direction of the direction signal of the anti-lock braking system within a preset time period, it is determined that the speed sensor has an abnormal direction fault.

9. The method according to claim 3, wherein: The step of adjusting the operating state of the engine according to the fault state of the rotation speed sensor comprises: In response to determining that the fault type of the rotation speed sensor is the open circuit fault, the short circuit to ground fault or the power supply short circuit fault, disabling the rotation speed sensor and replacing the current rotation speed information of the rotation speed sensor with the historical rotation speed information; The historical rotation speed information includes rotation speed information within a preset historical time period when the rotation speed sensor is in a normal state.

10. The method according to claim 7, wherein: The step of adjusting the operating state of the engine according to the fault state of the rotation speed sensor comprises: In response to determining that the fault type of the rotation speed sensor is the rotation speed value untrustworthy fault, disabling the rotation speed sensor and replacing the current rotation speed information of the rotation speed sensor with historical rotation speed information; In response to determining that the fault type of the output shaft speed sensor is the speed value untrustworthy fault, the output shaft The next speed information output by the speed sensor is replaced by the first speed information; In response to determining that the fault type of at least one of the odd-numbered shaft speed sensor and the even-numbered shaft speed sensor is an untrustworthy speed value fault, the next speed information output by the failed speed sensor is replaced with the current speed information of the output shaft speed sensor.

11. The method according to claim 8, wherein: The step of adjusting the operating state of the engine according to the fault state of the rotation speed sensor comprises: In response to determining that the fault type of the rotation speed sensor is the abnormal direction fault, current rotation speed information of the rotation speed sensor is replaced with historical rotation speed information, and the direction of the rotation speed sensor is replaced with the direction of the anti-lock braking system.

12. The method according to claim 2, after adjusting the operating state of the engine according to the fault state of the speed sensor, further comprises: In response to determining that the rotation speed sensor has at least one of the following faults, issuing an alarm signal: the electrical fault, the untrustworthy rotation speed value fault, and the abnormal direction fault; The occurrence time and fault information of at least one of the following faults are recorded: the electrical fault, the unreliable speed value fault, and the abnormal direction fault.

13. A fault detection device for a rotation speed sensor, comprising: An acquisition module is configured to acquire the operating current and current speed information of the speed sensor; a determination module, configured to determine a fault state of the speed sensor according to the working current and the current speed information; wherein the fault state of the speed sensor includes at least two fault types; The regulating module is configured to regulate the running state of the engine according to the fault state of the rotation speed sensor.

Images