Fault diagnosis device and fault diagnosis system of oil pressure sensor
By designing fault diagnosis equipment for oil pressure sensors, real-time fault monitoring of oil pressure sensors is achieved using voltage judgment structures and timing counting structures, solving the problem of failure of oil pressure sensors in the prior art that the failure of oil pressure sensors is not timely monitored, and improving the reliability of oil pressure monitoring.
Patent Information
- Application Number
- CN202421657072.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-07-12
AI Technical Summary
The prior art cannot timely monitor whether the oil pressure sensor is malfunctioning, resulting in poor reliability of oil pressure monitoring.
A fault diagnosis equipment for oil pressure sensors is designed, including voltage judgment structure and timing counting structure. The voltage judging structure compares the oil voltage with the reference voltage when the engine is running and outputs the first voltage; the timing counts the first voltage number received within a predetermined time period, and issues an alarm signal when the number of times is greater than the reference number to indicate the oil pressure sensor failure.
Real-time fault monitoring of the oil pressure sensor is realized, avoiding the problem of not being able to timely monitor whether the oil pressure sensor is faulty, and improving the reliability of oil pressure monitoring.
Smart Images
Figure CN222782694U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of fault diagnosis, and in particular to a fault diagnosis device and a fault diagnosis system for an oil pressure sensor. Background Art
[0002] As one of the engine operation control parameters, oil pressure affects the normal operation of the engine. In the related art, the oil pressure is monitored by installing an oil pressure sensor in front of the oil filter. Due to the lack of a monitoring solution for the oil pressure sensor, the failure of the oil pressure sensor cannot be discovered in time, resulting in poor reliability of oil pressure monitoring. Utility Model Content
[0003] The main purpose of the present application is to provide a fault diagnosis device and a fault diagnosis system for an oil pressure sensor, so as to solve the problem in the prior art that it is impossible to timely monitor whether the oil pressure sensor is faulty.
[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a fault diagnosis device for an oil pressure sensor is provided, wherein the oil pressure sensor is located on a pipeline between an oil filter inlet and an oil storage structure, and is used to collect oil pressure and convert the oil pressure into oil voltage. The fault diagnosis device for the oil pressure sensor comprises: a voltage judgment structure, comprising a first input terminal, a second input terminal, a third input terminal and an output terminal, the first input terminal of the voltage judgment structure being used to receive an operating parameter value of the engine, the second input terminal of the voltage judgment structure being used to receive a reference parameter value, and the third input terminal of the voltage judgment structure being used to connect the oil pressure force sensor, the voltage judgment structure is used to trigger the comparison of the magnitude relationship between the engine oil voltage and the reference voltage when the operating parameter value is greater than the reference parameter value, and output a first voltage when the engine oil voltage is greater than the reference voltage, and the reference parameter value is the minimum parameter value that characterizes the engine maintaining the operating state; a timing counting structure, the input end of the timing counting structure is connected to the output end of the voltage judgment structure, the timing counting structure is used to count the number of times the first voltage is received within a predetermined time period, and when the number is greater than the reference number, an alarm signal is issued, and the alarm signal is used to indicate a fault in the engine oil pressure sensor.
[0005] Optionally, the voltage judgment structure includes: a predetermined comparator, a first input end of the predetermined comparator is the first input end of the voltage judgment structure, a second input end of the predetermined comparator is the second input end of the voltage judgment structure, the predetermined comparator is used to compare the magnitude relationship between the operating parameter value and the reference parameter value, and output the reference voltage when the operating parameter value is greater than the reference parameter value; a voltage comparator, a first input end of the voltage comparator is the third input end of the voltage judgment structure, a second input end of the voltage comparator is connected to the output end of the predetermined comparator, and the output end of the voltage comparator is the output end of the voltage judgment structure, the voltage comparator is used to compare the magnitude relationship between the engine oil voltage and the reference voltage when the reference voltage is received, and output the first voltage when the engine oil pressure is greater than the reference voltage, and output the second voltage when the engine oil pressure is less than or equal to the reference voltage.
[0006] Optionally, the predetermined comparator includes at least one of the following: a speed comparator, a first input end of the speed comparator is used to connect to an engine speed sensor, a second input end of the speed comparator is used to receive an idle setting value, the speed comparator is used to receive the engine speed collected by the engine speed sensor, compare the engine speed with the idle setting value, and output the reference voltage when the engine speed is greater than the idle setting value, and output the non-reference voltage when the engine speed is less than or equal to the idle setting value; an oil quantity comparator, a first input end of the oil quantity comparator is used to connect to an oil quantity sensor, a second input end of the oil quantity comparator is used to receive the oil quantity setting value, the speed comparator is used to receive the engine circulating oil quantity collected by the oil quantity sensor, compare the engine circulating oil quantity with the oil quantity setting value, and output the reference voltage when the engine circulating oil quantity is greater than the oil quantity setting value, and output the non-reference voltage when the engine circulating oil quantity is less than or equal to the oil quantity setting value.
[0007] Optionally, in the case where the predetermined comparator includes the speed comparator and the oil level comparator, the voltage judgment structure also includes: an AND gate, the first input end of the AND gate is connected to the output end of the speed comparator, the second input end of the AND gate is connected to the output end of the oil level comparator, the output end of the AND gate is the output end of the predetermined comparator, and the AND gate is used to output the reference voltage when two reference voltages are received, and output the non-reference voltage when one reference voltage is received.
[0008] Optionally, in the case where the predetermined comparator includes the speed comparator and the oil level comparator, the voltage judgment structure further includes: an OR gate, wherein the first input end of the OR gate is connected to the output end of the speed comparator, the second input end of the OR gate is connected to the output end of the oil level comparator, the output end of the OR gate is the output end of the predetermined comparator, and the OR gate is used to output the reference voltage when at least one of the reference voltages is received.
[0009] Optionally, the timing counting structure includes: a timer, the input end of the timer is connected to the output end of the voltage judgment structure, the timer is used to start timing when it is not in the timing mode and receives the first voltage, and exit the timing mode and output a timing signal when the timing duration reaches the predetermined duration; a counter, the control end of the counter is connected to the output end of the timer, the input end of the counter is connected to the output end of the voltage judgment structure, the counter is used to start counting the number of times when the first voltage is received, and output the number of times when the timing signal is received; a number comparator, the first input end of the number comparator is connected to the output end of the counter, the second end of the number comparator is used to receive the reference number, the number comparator is used to compare the relationship between the number and the reference number, and when the number is greater than the reference number, the alarm signal is issued.
[0010] Optionally, the counter is one of the following: a synchronous counter, an asynchronous counter.
[0011] Optionally, the fault diagnosis device of the oil pressure sensor further comprises: an alarm connected to the output end of the timing counting structure, and the alarm is used to sound a buzzer alarm when receiving the alarm signal.
[0012] Optionally, the fault diagnosis device of the oil pressure sensor is an FPGA.
[0013] According to another aspect of the present application, a fault diagnosis system is provided, comprising: an oil pressure sensor located on a pipeline between an oil filter inlet and an oil storage structure, for collecting oil pressure and converting the oil pressure into oil voltage; and a fault diagnosis device for any of the oil pressure sensors described.
[0014] By applying the technical solution of the present application, the fault diagnosis device is provided with a voltage judgment structure and a timing counting structure. When the operating parameter value is greater than the reference parameter value, that is, when it is determined that the engine is in an operating state, the voltage judgment structure triggers a comparison of the magnitude relationship between the oil voltage and the reference voltage. Whenever the oil voltage is greater than the reference voltage, a first voltage is output once. The timing counting structure counts the number of times the first voltage is received within a predetermined time period. When the number is greater than the reference number, it indicates that the oil pressure sensor has a fault. At this time, an alarm signal is issued, and the oil pressure sensor can be monitored for faults in real time to avoid the problem of being unable to monitor whether the oil pressure sensor is faulty in time and being unable to effectively monitor the oil pressure. The present application ensures that the reliability of oil pressure monitoring is high. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
[0016] Figure 1 A schematic structural diagram of a fault diagnosis device for an oil pressure sensor provided according to an embodiment of the present application is shown;
[0017] Figure 2 A schematic structural diagram of another oil pressure sensor fault diagnosis device provided according to an embodiment of the present application is shown.
[0018] The above drawings include the following reference numerals:
[0019] 10. Voltage judgment structure; 11. Oil pressure sensor; 12. Timing counting structure; 100. Predetermined comparator; 101. Voltage comparator; 120. Timer; 121. Counter; 122. Times comparator. DETAILED DESCRIPTION
[0020] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.
[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0022] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element, or there may be intermediate elements. Moreover, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element, or "connected" to the other element through a third element.
[0023] As introduced in the background technology, the prior art cannot timely monitor whether the oil pressure sensor is faulty. In order to solve the above technical problems, the present application proposes a fault diagnosis device and a fault diagnosis system for the oil pressure sensor.
[0024] The embodiment of the present application provides a fault diagnosis device for an oil pressure sensor, wherein the oil pressure sensor is located on a pipeline between an oil filter inlet and an oil storage structure, and is used to collect oil pressure and convert the oil pressure into oil voltage, such as Figure 1 As shown, the fault diagnosis device of the above oil pressure sensor includes:
[0025] The voltage judgment structure 10 comprises a first input terminal, a second input terminal, a third input terminal and an output terminal. The first input terminal of the voltage judgment structure 10 is used to receive the operating parameter value of the engine. The second input terminal of the voltage judgment structure 10 is used to receive the reference parameter value. The third input terminal of the voltage judgment structure 10 is used to connect the oil pressure sensor 11. The voltage judgment structure 10 is used to trigger the comparison of the magnitude relationship between the oil voltage and the reference voltage when the operating parameter value is greater than the reference parameter value. When the oil voltage is greater than the reference voltage, the first voltage is output. The reference parameter value is the minimum parameter value that indicates that the engine maintains the operating state.
[0026] Specifically, the above-mentioned operating parameter value is any parameter that characterizes the operating state of the above-mentioned engine, such as engine speed, engine circulating oil volume, etc. When the above-mentioned operating parameter value is greater than the above-mentioned reference parameter value, it means that the above-mentioned engine is currently in an operating state. The above-mentioned oil pressure sensor is used to detect the pressure value before the above-mentioned oil filter, obtain the above-mentioned oil pressure, and use the piezoelectric effect to convert the above-mentioned oil pressure into a voltage signal to obtain the above-mentioned oil voltage and output it. The above-mentioned first voltage can be a high-level voltage or a low-level voltage, as long as the above-mentioned first voltage is different from the voltage output by the above-mentioned voltage judgment structure when the above-mentioned oil voltage is less than or equal to the above-mentioned reference voltage.
[0027] A timing counting structure 12, wherein the input end of the timing counting structure 12 is connected to the output end of the voltage judging structure 10, and the timing counting structure 12 is used for counting the number of times the first voltage is received within a predetermined time period, and when the number is greater than a reference number, an alarm signal is issued, and the alarm signal is used for indicating a fault in the oil pressure sensor.
[0028] Through the above embodiments, the fault diagnosis device of the present application is provided with a voltage judgment structure and a timing counting structure. When the above operating parameter value is greater than the above reference parameter value, that is, when it is determined that the engine is in an operating state, the voltage judgment structure triggers a comparison of the size relationship between the oil voltage and the reference voltage. Whenever the oil voltage is greater than the reference voltage, a first voltage is output once. The timing counting structure counts the number of times the first voltage is received within a predetermined time period. When the number is greater than the reference number, it indicates that the oil pressure sensor has a fault. At this time, an alarm signal is issued, and the oil pressure sensor can be monitored for faults in real time to avoid the problem of being unable to monitor whether the oil pressure sensor is faulty in time and being unable to effectively monitor the oil pressure. The present application ensures that the reliability of oil pressure monitoring is high.
[0029] Those skilled in the art can flexibly set the specific values of the reference voltage, the predetermined time and the reference number according to actual needs. After analyzing the data, the present application found that when the oil pressure sensor is damaged, the original voltage of the oil pressure sensor fluctuates greatly, and the original voltage exceeds 4900mv 5 to 6 times within 1 second. Based on the above findings, in an exemplary embodiment, the reference voltage is 4900mv, the predetermined time is 1s, and the reference number is 3.
[0030] Some of the options available, such as Figure 2 As shown, the voltage judgment structure 10 includes:
[0031] A predetermined comparator 100, wherein the first input terminal of the predetermined comparator 100 is the first input terminal of the voltage judgment structure 10, that is, the predetermined comparator 100 is used to receive the operating parameter value, and the second input terminal of the predetermined comparator 100 is the second input terminal of the voltage judgment structure 10, that is, the predetermined comparator is used to receive the reference parameter value, and the predetermined comparator 100 is used to compare the magnitude relationship between the operating parameter value and the reference parameter value, and output the reference voltage when the operating parameter value is greater than the reference parameter value;
[0032] Specifically, when the operating parameter value is less than or equal to the reference parameter value, the predetermined comparator does not output a voltage (ie, the output voltage is 0) or outputs a voltage value different from the reference voltage.
[0033] A voltage comparator 101, wherein the first input terminal of the voltage comparator 101 is the third input terminal of the voltage judgment structure 10, that is, the first input terminal of the voltage comparator 101 is used to connect to the oil pressure sensor 11, the second input terminal of the voltage comparator 101 is connected to the output terminal of the predetermined comparator 100, the output terminal of the voltage comparator 101 is the output terminal of the voltage judgment structure, and the voltage comparator 101 is used to compare the oil voltage with the reference voltage when receiving the reference voltage, output the first voltage when the oil pressure is greater than the reference voltage, and output the second voltage when the oil pressure is less than or equal to the reference voltage.
[0034] Specifically, the first voltage is different from the second voltage.
[0035] In the above embodiment, the operating parameter value is compared with the reference parameter value by a predetermined comparator to monitor whether the engine is running, and the reference voltage is output to the voltage comparator when the operating parameter value is greater than the reference parameter value; the reference voltage is compared with the oil voltage by the voltage comparator to monitor whether the output voltage value of the oil pressure sensor is abnormal.
[0036] The predetermined comparator and the voltage comparator may be any suitable type of comparator, such as a linear comparator, a differential comparator, etc. Those skilled in the art may flexibly set the specific structure of the predetermined comparator and the voltage comparator according to actual needs, and this application does not impose any specific restrictions on this.
[0037] In order to further realize effective monitoring of the engine operating state, according to some other exemplary schemes of the present application, the predetermined comparator includes at least one of the following: a speed comparator, wherein the first input end of the speed comparator is used to connect to the engine speed sensor, the second input end of the speed comparator is used to receive the idle setting value, the speed comparator is used to receive the engine speed collected by the engine speed sensor, compare the engine speed with the idle setting value, and output the reference voltage when the engine speed is greater than the idle setting value, and output the non-reference voltage when the engine speed is less than or equal to the idle setting value; an oil quantity comparator, wherein the first input end of the oil quantity comparator is used to connect to the oil quantity sensor, the second input end of the oil quantity comparator is used to receive the oil quantity setting value, the speed comparator is used to receive the engine circulating oil quantity collected by the oil quantity sensor, compare the engine circulating oil quantity with the oil quantity setting value, and output the reference voltage when the engine circulating oil quantity is greater than the oil quantity setting value, and output the non-reference voltage when the engine circulating oil quantity is less than or equal to the oil quantity setting value. In this embodiment, a speed comparator is used to compare the actual engine speed with the idle speed setting value to determine whether the engine is in an operating state, and / or an oil quantity comparator is used to compare the actual engine circulating oil quantity with the oil quantity setting value to determine whether the engine is in an operating state. This can accurately and simply determine whether the engine is in an operating state, and provide accurate result support for whether to perform subsequent oil pressure sensor fault detection.
[0038] There are three situations in the above-mentioned embodiment. The first situation is that the above-mentioned fault diagnosis device includes both a speed comparator and an oil quantity comparator, and determines whether the engine is in a running state through double verification of the two data of speed and circulating oil quantity; the second situation is that the above-mentioned fault diagnosis device only includes a speed comparator, but does not include an oil quantity comparator, and determines whether the engine is in a running state through the speed; the third situation is that the above-mentioned fault diagnosis device only includes an oil quantity comparator, but does not include a speed comparator, and determines whether the engine is in a running state through the circulating oil quantity.
[0039] Specifically, the specific value of the above oil volume setting value can be flexibly set according to actual needs, such as setting the above oil volume setting value to 0.
[0040] In some other embodiments of the present application, when the predetermined comparator includes the speed comparator and the oil quantity comparator, the voltage judgment structure further includes: an AND gate, wherein the first input terminal of the AND gate is connected to the output terminal of the speed comparator, the second input terminal of the AND gate is connected to the output terminal of the oil quantity comparator, the output terminal of the AND gate is the output terminal of the predetermined comparator, and the AND gate is used to output the reference voltage when receiving two reference voltages, and output the non-reference voltage when receiving one reference voltage, wherein the reference voltage is different from the non-reference voltage. Through the AND gate, the reference voltage is output only when both the engine speed and the circulating oil quantity meet the conditions, and the reference voltage is not output when only the engine speed or the circulating oil quantity meets the conditions, thereby realizing the double verification of the engine speed and the circulating oil quantity to determine whether the engine is in the running state, and further ensuring the accuracy of the determination.
[0041] In addition to the above embodiments, in some other embodiments of the present application, when the above predetermined comparator includes the above speed comparator and the above oil quantity comparator, the above voltage judgment structure also includes: an OR gate, the first input end of the above OR gate is connected to the output end of the above speed comparator, the second input end of the above OR gate is connected to the output end of the above oil quantity comparator, the output end of the above OR gate is the output end of the above predetermined comparator, and the above OR gate is used to output the above reference voltage when at least one of the above reference voltages is received, and output a non-reference voltage when both received voltages are non-reference voltages. Through the above OR gate, the above reference voltage is output when the engine speed or circulating oil quantity meets the conditions, so as to determine whether the engine is in a running state by the engine speed or circulating oil quantity, and the determination process is relatively simple and efficient.
[0042] In order to further solve the problem in the prior art that the oil pressure sensor cannot be monitored in time to see if it is faulty, thereby further ensuring that the oil pressure can be effectively monitored by the oil pressure sensor, thereby further realizing effective monitoring of whether the engine is running normally, optionally, as Figure 2 As shown, the timing counting structure 12 comprises:
[0043] A timer 120, wherein the input end of the timer 120 is connected to the output end of the voltage judgment structure 10, and the timer 120 is used to start timing when it is not in the timing mode and receives the first voltage, and to exit the timing mode and output a timing signal when the timing duration reaches the predetermined duration;
[0044] Specifically, not being in the timing mode refers to an operating mode in which the timer is not timing.
[0045] A counter 121, wherein a control end of the counter 121 is connected to an output end of the timer 120, an input end of the counter 121 is connected to an output end of the voltage judgment structure 10, and the counter 121 is used to start counting the number of times when receiving the first voltage, and output the number of times when receiving the timing signal;
[0046] A number comparator 122, wherein the first input terminal of the number comparator 122 is connected to the output terminal of the counter 121, and the second terminal of the number comparator 122 is used to receive the reference number. The number comparator is used to compare the magnitude relationship between the number and the reference number, and when the number is greater than the reference number, the alarm signal is issued.
[0047] Specifically, the alarm signal can prompt relevant personnel to replace the oil pressure sensor or perform maintenance on the oil pressure sensor in a timely manner.
[0048] Through the cooperation of the above-mentioned timer, the above-mentioned counter and the above-mentioned number comparator, the number of times the first voltage is received within a predetermined time period is counted, and the number is compared with the reference number. This further ensures real-time fault monitoring of the oil pressure sensor, further avoids the problem of being unable to timely monitor whether the oil pressure sensor is faulty, resulting in the inability to effectively monitor the oil pressure, thereby further ensuring the high reliability of oil pressure monitoring, so that the oil pressure can be effectively monitored according to the oil pressure sensor, thereby further realizing effective monitoring of whether the engine is running normally.
[0049] In actual application, the counter is one of the following: a synchronous counter and an asynchronous counter.
[0050] Optionally, the fault diagnosis device for the oil pressure sensor further comprises: an alarm connected to the output end of the timing counting structure, the alarm being used to sound a buzzer alarm when receiving the alarm signal, so that relevant personnel can pay attention to the signal in time by converting the electrical signal indicating the fault of the oil pressure sensor into an audio signal.
[0051] The above-mentioned oil pressure sensor fault diagnosis device of the present application can be any hardware structure including the above-mentioned structure, such as a microcontroller, FPGA, etc. In the present application, the above-mentioned oil pressure sensor fault diagnosis device is an FPGA, that is, an FPGA having the above-mentioned voltage judgment structure and the above-mentioned timing counting structure.
[0052] In the present application, when the engine is running, the fault diagnosis equipment of the oil pressure sensor monitors the original voltage value of the oil pressure sensor in real time. When the original voltage value exceeds 4900mv, the number of times the original voltage value of the oil pressure sensor exceeds 4900mv within 1s is counted. When the number exceeds 3 times, the oil pressure sensor is considered to be damaged, and the ECU reports the oil pressure sensor damage fault and controls the alarm light to sound, so as to remind the fault handling platform to prompt the customer to replace the oil pressure sensor. The fault diagnosis equipment can quickly locate the faulty part, avoid checking components such as wiring harnesses, and improve the efficiency of fault resolution.
[0053] The embodiment of the present application also provides a fault diagnosis system, including:
[0054] An oil pressure sensor, located on the pipeline between the oil filter inlet and the oil storage structure, is used to collect the oil pressure and convert the oil pressure into oil voltage;
[0055] Any of the above-mentioned oil pressure sensor fault diagnosis equipment.
[0056] The above-mentioned fault diagnosis system includes an oil pressure sensor and a fault diagnosis device thereof. The fault diagnosis device is provided with a voltage judgment structure and a timing counting structure. When the above-mentioned operating parameter value is greater than the above-mentioned reference parameter value, that is, when it is determined that the engine is in an operating state, the voltage judgment structure triggers a comparison of the magnitude relationship between the oil voltage and the reference voltage. Whenever the oil voltage is greater than the reference voltage, a first voltage is output once. The timing counting structure counts the number of times the first voltage is received within a predetermined time period. When the number is greater than the reference number, it indicates that the oil pressure sensor has a fault. At this time, an alarm signal is issued, and the oil pressure sensor can be monitored for faults in real time to avoid the problem of being unable to timely monitor whether the oil pressure sensor is faulty and being unable to effectively monitor the oil pressure. The present application ensures that the reliability of oil pressure monitoring is high.
[0057] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:
[0058] 1) The fault diagnosis device of the present application is provided with a voltage judgment structure and a timing counting structure. When the above-mentioned operating parameter value is greater than the above-mentioned reference parameter value, that is, when it is determined that the engine is in an operating state, the voltage judgment structure triggers a comparison of the size relationship between the engine oil voltage and the reference voltage. Whenever the engine oil voltage is greater than the reference voltage, a first voltage is output once. The timing counting structure counts the number of times the first voltage is received within a predetermined time period. When the number is greater than the reference number, it indicates that the engine oil pressure sensor has a fault. At this time, an alarm signal is issued, and the engine oil pressure sensor can be monitored for faults in real time to avoid the problem of being unable to monitor whether the engine oil pressure sensor is faulty in time and being unable to effectively monitor the engine oil pressure. The present application ensures that the reliability of the engine oil pressure monitoring is high.
[0059] 2) The fault diagnosis system of the present application includes an oil pressure sensor and a fault diagnosis device thereof. The fault diagnosis device is provided with a voltage judgment structure and a timing counting structure. When the above-mentioned operating parameter value is greater than the above-mentioned reference parameter value, that is, when it is determined that the engine is in an operating state, the voltage judgment structure triggers a comparison of the magnitude relationship between the oil voltage and the reference voltage. Whenever the oil voltage is greater than the reference voltage, a first voltage is output once. The timing counting structure counts the number of times the first voltage is received within a predetermined time period. When the number is greater than the reference number, it indicates that the oil pressure sensor has a fault. At this time, an alarm signal is issued, and the oil pressure sensor can be monitored for faults in real time to avoid the problem of being unable to monitor whether the oil pressure sensor is faulty in time and being unable to effectively monitor the oil pressure. The present application ensures that the reliability of oil pressure monitoring is high.
[0060] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A fault diagnosis device for an oil pressure sensor, characterized in that: The oil pressure sensor is located on the pipeline between the oil filter inlet and the oil storage structure, and is used to collect the oil pressure and convert the oil pressure into oil voltage. The fault diagnosis device of the oil pressure sensor includes: A voltage judgment structure, comprising a first input terminal, a second input terminal, a third input terminal and an output terminal, wherein the first input terminal of the voltage judgment structure is used to receive an operating parameter value of the engine, the second input terminal of the voltage judgment structure is used to receive a reference parameter value, and the third input terminal of the voltage judgment structure is used to connect the oil pressure sensor, and the voltage judgment structure is used to trigger a comparison between the oil voltage and the reference voltage when the operating parameter value is greater than the reference parameter value, and output a first voltage when the oil voltage is greater than the reference voltage, and the reference parameter value is a minimum parameter value that indicates that the engine maintains an operating state; A timing counting structure, wherein the input end of the timing counting structure is connected to the output end of the voltage judgment structure, the timing counting structure is used to count the number of times the first voltage is received within a predetermined time period, and when the number is greater than a reference number, an alarm signal is issued, and the alarm signal is used to indicate a fault in the oil pressure sensor.
2. The fault diagnosis device for the oil pressure sensor according to claim 1, characterized in that: The voltage judgment structure includes: a predetermined comparator, wherein the first input terminal of the predetermined comparator is the first input terminal of the voltage judgment structure, the second input terminal of the predetermined comparator is the second input terminal of the voltage judgment structure, and the predetermined comparator is used to compare the magnitude relationship between the operating parameter value and the reference parameter value, and output the reference voltage when the operating parameter value is greater than the reference parameter value; A voltage comparator, wherein the first input terminal of the voltage comparator is the third input terminal of the voltage judgment structure, the second input terminal of the voltage comparator is connected to the output terminal of the predetermined comparator, the output terminal of the voltage comparator is the output terminal of the voltage judgment structure, and the voltage comparator is used to compare the magnitude relationship between the engine oil voltage and the reference voltage when receiving the reference voltage, output the first voltage when the engine oil pressure is greater than the reference voltage, and output the second voltage when the engine oil pressure is less than or equal to the reference voltage.
3. The fault diagnosis device for the oil pressure sensor according to claim 2, characterized in that: The predetermined comparator includes at least one of the following: A speed comparator, wherein a first input terminal of the speed comparator is used to connect to an engine speed sensor, a second input terminal of the speed comparator is used to receive an idle speed setting value, the speed comparator is used to receive an engine speed collected by the engine speed sensor, compare the engine speed with the idle speed setting value, and output the reference voltage when the engine speed is greater than the idle speed setting value, and output a non-reference voltage when the engine speed is less than or equal to the idle speed setting value; An oil quantity comparator, wherein the first input end of the oil quantity comparator is used to connect to the oil quantity sensor, the second input end of the oil quantity comparator is used to receive the oil quantity setting value, and the speed comparator is used to receive the engine circulating oil quantity collected by the oil quantity sensor, compare the engine circulating oil quantity with the oil quantity setting value, and output the reference voltage when the engine circulating oil quantity is greater than the oil quantity setting value, and output the non-reference voltage when the engine circulating oil quantity is less than or equal to the oil quantity setting value.
4. The fault diagnosis device for the oil pressure sensor according to claim 3, characterized in that: In the case where the predetermined comparator includes the speed comparator and the oil quantity comparator, the voltage judgment structure further includes: An AND gate, wherein the first input terminal of the AND gate is connected to the output terminal of the speed comparator, the second input terminal of the AND gate is connected to the output terminal of the oil level comparator, the output terminal of the AND gate is the output terminal of the predetermined comparator, and the AND gate is used to output the reference voltage when two reference voltages are received, and output the non-reference voltage when one reference voltage is received.
5. The fault diagnosis device for the oil pressure sensor according to claim 3, characterized in that: In the case where the predetermined comparator includes the speed comparator and the oil quantity comparator, the voltage judgment structure further includes: An OR gate, wherein the first input terminal of the OR gate is connected to the output terminal of the speed comparator, the second input terminal of the OR gate is connected to the output terminal of the oil quantity comparator, the output terminal of the OR gate is the output terminal of the predetermined comparator, and the OR gate is used to output the reference voltage when receiving at least one of the reference voltages.
6. The fault diagnosis device for the oil pressure sensor according to claim 1, characterized in that: The timing counting structure comprises: a timer, wherein the input end of the timer is connected to the output end of the voltage judgment structure, the timer is used to start timing when it is not in the timing mode and receives the first voltage, and to exit the timing mode and output a timing signal when the timing duration reaches the predetermined duration; a counter, wherein a control end of the counter is connected to an output end of the timer, an input end of the counter is connected to an output end of the voltage judgment structure, and the counter is used to start counting the number of times when receiving the first voltage, and output the number of times when receiving the timing signal; A times comparator, wherein the first input terminal of the times comparator is connected to the output terminal of the counter, the second terminal of the times comparator is used to receive the reference times, the times comparator is used to compare the magnitude relationship between the times and the reference times, and when the times are greater than the reference times, the alarm signal is issued.
7. The fault diagnosis device for the oil pressure sensor according to claim 6, characterized in that: The counter is one of the following: a synchronous counter and an asynchronous counter.
8. The fault diagnosis device for an oil pressure sensor according to any one of claims 1 to 7, characterized in that: The fault diagnosis device of the oil pressure sensor also includes: An alarm is connected to the output end of the timing counting structure, and the alarm is used to sound a buzzer alarm when receiving the alarm signal.
9. The fault diagnosis device for an oil pressure sensor according to any one of claims 1 to 7, characterized in that: The fault diagnosis device of the oil pressure sensor is FPGA.
10. A fault diagnosis system, characterized in that: include: An oil pressure sensor, located on the pipeline between the oil filter inlet and the oil storage structure, for collecting the oil pressure and converting the oil pressure into an oil voltage; A fault diagnosis device for an oil pressure sensor as claimed in any one of claims 1 to 9.