CN114858344A

CN114858344A - Fault diagnosis method and device for pressure sensor, storage medium and engineering equipment

Info

Publication number: CN114858344A
Application number: CN202210546043.4A
Authority: CN
Inventors: 李志强; 缪丰隆; 李家荣
Original assignee: Hunan Deutz Power Co Ltd
Current assignee: Hunan Deutz Power Co Ltd
Priority date: 2022-05-19
Filing date: 2022-05-19
Publication date: 2022-08-05
Anticipated expiration: 2042-05-19
Also published as: CN114858344B

Abstract

The invention provides a fault diagnosis method, a fault diagnosis device, a storage medium and engineering equipment of a pressure sensor, wherein the fault diagnosis method comprises the following steps: under the condition that the engine is in a first working state and the first pressure sensor and the second pressure sensor have no line fault, acquiring a first pressure value output by the first pressure sensor and a second pressure value output by the second pressure sensor; confirming that the second pressure sensor has a fault under the condition that the difference value between the first pressure value and the second pressure value is not in a preset pressure range; the first pressure sensor is an atmospheric pressure sensor in a controller of the engine, and the second pressure sensor is an intercooled pressure sensor of the engine. According to the technical scheme, the fault diagnosis of the pressure sensor after the cold centering is realized, and the sensor avoids the condition that the engine operates unstably due to the fact that the air inflow of the engine is abnormal because the pressure value output by the pressure sensor is inaccurate.

Description

Fault diagnosis method and device for pressure sensor, storage medium and engineering equipment

Technical Field

The invention relates to the technical field of fault diagnosis, in particular to a fault diagnosis method and device of a pressure sensor, a storage medium and engineering equipment.

Background

In the prior art, when a pressure sensor of an engine of engineering equipment has problems of zero drift of a pressure signal, damage of a pressure signal sampling circuit or a conversion circuit and the like after intercooling, the pressure value output by the pressure sensor is inaccurate, and when the output pressure value is larger, the air inflow calculated by the engine is larger, the sprayed fuel is excessive, and the conditions of combustion deterioration and over-high fuel consumption occur; when the output pressure value is smaller, the air inflow calculated by the engine is smaller, the sprayed fuel is too little, and the situation of insufficient power occurs. Therefore, how to provide a technical scheme capable of diagnosing faults of the intercooled pressure sensor of the engine becomes a problem which needs to be solved urgently.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art or the related art.

To this end, a first aspect of the present invention is to provide a method of diagnosing a failure of a pressure sensor.

A second aspect of the present invention is to provide a failure diagnosis device of a pressure sensor.

A third aspect of the invention is directed to a readable storage medium.

A fourth aspect of the present invention is to provide an engineering apparatus.

In view of the above, according to one aspect of the present invention, there is provided a failure diagnosis method of a pressure sensor, the failure diagnosis method including: under the condition that the engine is in a first working state and the first pressure sensor and the second pressure sensor have no line fault, acquiring a first pressure value output by the first pressure sensor and a second pressure value output by the second pressure sensor; confirming that the second pressure sensor has a fault under the condition that the difference value between the first pressure value and the second pressure value is not in a preset pressure range; the first pressure sensor is an atmospheric pressure sensor in a controller of the engine, and the second pressure sensor is an intercooled pressure sensor of the engine.

It should be noted that the fault diagnosis method for the pressure sensor provided by the present invention is mainly used for fault diagnosis of an intercooled pressure sensor of an engine of a construction equipment, and an execution subject of the fault diagnosis method for the pressure sensor provided by the present invention may be a fault diagnosis device for the pressure sensor.

In this embodiment, the first pressure sensor is an atmospheric pressure sensor in a controller of the engine, and the second pressure sensor is a post-cold pressure sensor of the engine.

Specifically, the fault diagnosis device firstly judges whether the operating state of the engine and the first pressure sensor and the second pressure sensor have line faults, and acquires a first pressure value detected by the first pressure sensor and a second pressure value detected by the second pressure sensor under the condition that the engine is judged to be in the first operating state and the first pressure sensor and the second pressure sensor have no line faults.

Specifically, if the operating state of the engine is the first operating state, it indicates that the engine speed is 0 and has been maintained for a certain time, i.e., the engine is in a state of the substrate, at which the intercooled pressure of the engine has been completely released, i.e., the intercooled pressure of the engine should be equal to the atmospheric pressure. If the first pressure sensor and the second pressure sensor do not have line faults, the first pressure sensor and the second pressure sensor do not have open circuit or short circuit faults, namely the pressure values output by the first pressure sensor and the second pressure sensor are both effective values.

Further, the fault diagnosis device calculates a difference value between the first pressure value and the second pressure value, and determines whether the second pressure sensor has a fault according to whether the difference value is within a preset pressure preset range. Specifically, if the difference is not within the preset pressure range, it indicates that the second pressure sensor is malfunctioning.

Specifically, if the difference between the first pressure value and the second pressure value is not within the preset pressure range, it indicates that the difference between the second pressure value and the normal atmospheric pressure value is too large, that is, the difference between the pressure value detected by the second pressure sensor and the atmospheric pressure value is too large. Specifically, in the case where the engine is in the first operating state and there is no line fault in both the first pressure sensor and the second pressure sensor, the pressure value detected by the second pressure sensor (i.e., the second pressure value) should be equal to the normal atmospheric pressure value. Therefore, when the second pressure value is excessively different from the normal atmospheric pressure value, it can be determined that the second pressure sensor (i.e., the post-cold pressure sensor) has a failure.

In the technical scheme, the fault diagnosis device can judge whether the second pressure sensor (namely the intercooling rear pressure sensor of the engine) has faults or not according to the first pressure value and the second pressure value detected under the condition that the engine is in the first working state and the first pressure sensor and the second pressure sensor do not have line faults, so that the condition that the air inflow of the engine is abnormal and the operation of the engine is unstable due to the fact that the pressure value output by the second pressure sensor is inaccurate is avoided. Meanwhile, in the technical scheme of the invention, additional electronic devices do not need to be added, namely, additional cost does not need to be added.

In addition, the method for diagnosing a failure of a pressure sensor according to the above aspect of the present invention may further include the following additional features:

in the above technical solution, under the condition that the engine is in the first operating state and the first pressure sensor and the second pressure sensor do not have a line fault, before the first pressure value output by the first pressure sensor and the second pressure value output by the second pressure sensor are obtained, the fault diagnosis method further includes: acquiring a rotating speed value of an engine; and confirming that the engine is in a first working state under the condition that the rotating speed value of the engine is equal to the rotating speed threshold value and is maintained for a first preset time period.

In this technical solution, before obtaining the first pressure value and the second pressure value, the fault diagnosis device further needs to obtain a rotation speed value of the engine to determine whether the engine is in the first working state.

Specifically, the process of the fault diagnosis device judging whether the engine is in the first working state according to the rotating speed value of the engine is as follows: the fault diagnosis device judges whether the rotating speed value of the engine is equal to a rotating speed threshold value or not, and determines that the engine is in a first working state under the condition that the rotating speed value of the engine is equal to the rotating speed threshold value and the first preset time length is maintained. Specifically, the rotation speed threshold is generally set to 0, and the first preset time period is set to 30 seconds, that is, when the engine is in a stationary state and is maintained for 30 seconds, it is determined that the engine is in the first operating state.

In the technical scheme, the fault diagnosis device can confirm whether the engine is in the first working state or not according to the acquired rotating speed value of the engine and the time length of the engine maintained at the rotating speed value. Specifically, when the engine is in the first operating state, the second pressure value detected by the second pressure sensor is approximately equal to the atmospheric pressure, and therefore, the fault diagnosis device needs to judge the operating state of the engine by acquiring the rotation speed value of the engine to ensure the accuracy of fault diagnosis of the pressure sensor according to the second pressure value in the subsequent step.

In the above technical solution, after confirming that the engine is in the first operating state, the fault diagnosis method further includes: acquiring a first voltage value of a first pressure sensor and a second voltage value of a second pressure sensor; and under the condition that the first voltage value and the second voltage value are both in the preset voltage range, determining that no line fault exists in the first pressure sensor and the second pressure sensor.

In the technical scheme, the line fault refers to an open-circuit fault or a short-circuit fault of a connection line between the first pressure sensor and the second pressure sensor and a master controller of the engineering equipment.

Specifically, the step of the fault diagnosis device determining whether the first pressure sensor and the second pressure sensor have a fault of the line is as follows: the fault diagnosis device firstly acquires a first voltage value of the first pressure sensor and a second voltage value of the second pressure sensor, and then judges whether line faults exist in the first pressure sensor and the second pressure sensor according to whether the first voltage value and the second voltage value are in a preset voltage range.

Specifically, when the fault diagnosis device determines that the first voltage value is outside the preset voltage range, it may be determined that the first pressure sensor has an open-circuit fault or a short-circuit fault. Specifically, if the first voltage value is smaller than the lower limit value of the preset voltage range, it indicates that the first pressure sensor has a line short-circuit fault; if the first voltage value is larger than the upper limit value of the preset voltage range, the open-circuit fault of the first pressure sensor is indicated.

Specifically, when the fault diagnosis device determines that the second voltage value is outside the preset voltage range, it may be determined that the second pressure sensor has an open-circuit fault or a short-circuit fault. Specifically, if the second voltage value is smaller than the lower limit value of the preset voltage range, it indicates that the second pressure sensor has a line short-circuit fault; and if the second voltage value is larger than the upper limit value of the preset voltage range, indicating that the second pressure sensor has an open-circuit fault.

Specifically, under the condition that the first voltage value and the second voltage value are both within the preset voltage range, the fault diagnosis device determines that the first pressure sensor and the second pressure sensor have neither a line nor a short-circuit fault, that is, the first pressure sensor and the second pressure sensor have no line fault.

In the technical scheme, the fault diagnosis device can judge whether the first pressure sensor and the second pressure sensor have line faults according to the acquired first voltage value of the first pressure sensor and the acquired second voltage value of the second pressure sensor. Specifically, when there is no line fault in the first pressure sensor or the second pressure sensor, the pressure value (first pressure value) detected by the first pressure sensor and the pressure value (second pressure value) detected by the first pressure sensor have reference values. Therefore, the fault diagnosis device needs to judge whether the first pressure sensor and the second pressure sensor have line faults according to the first voltage value and the second voltage value so as to ensure the accuracy of fault diagnosis of the pressure sensors according to the first pressure value and the second pressure value in the subsequent steps.

In the technical scheme, the preset pressure range is greater than or equal to-0.5 bar and less than or equal to 0.5 bar.

In this solution, the preset range of pressure is-0.5 bar to 0.5 bar. Specifically, due to the accuracy of the sensor or the aging problem of the sensor in long-term use, the deviation range of plus or minus 0.5bar is set in the pressure preset range, so that the accuracy of fault diagnosis of the second pressure sensor according to the pressure preset range is improved.

In the above technical solution, the preset voltage range is greater than or equal to 0.5V and less than or equal to 4.5V.

In the technical scheme, the preset voltage range is 0.5V to 4.5V, specifically, the minimum value of the working voltage of the pressure sensor used for being arranged on the engineering equipment is generally 0.5V, and the maximum value of the working voltage is generally 4.5V, so that the preset voltage range is 0.5V to 4.5V, and thus, the accuracy of confirming whether the first pressure sensor and the second pressure sensor have line faults according to the preset voltage range is improved.

According to a second aspect of the present invention, there is provided a failure diagnosis device of a pressure sensor, including: the acquisition module is used for acquiring a first pressure value output by the first pressure sensor and a second pressure value output by the second pressure sensor under the condition that the engine is in a first working state and the first pressure sensor and the second pressure sensor have no line fault; the first processing module is used for confirming that the second pressure sensor has a fault under the condition that the difference value between the first pressure value and the second pressure value is not in a preset pressure range; the first pressure sensor is an atmospheric pressure sensor in a controller of the engine, and the second pressure sensor is used for indicating an intercooled pressure sensor of the engine.

The pressure sensor fault diagnosis device provided by the invention is mainly used for fault diagnosis of an intercooled pressure sensor of an engine of engineering equipment.

Specifically, whether the working state of the engine and the line faults exist in the first pressure sensor and the second pressure sensor is judged, and under the condition that the engine is judged to be in the first working state and the line faults do not exist in the first pressure sensor and the second pressure sensor, a first pressure value detected by the first pressure sensor and a second pressure value detected by the second pressure sensor are obtained through the obtaining module.

Further, the first processing module calculates a difference value between the first pressure value and the second pressure value, and determines whether the second pressure sensor has a fault according to whether the difference value is within a preset pressure preset range. Specifically, if the difference is not within the preset pressure range, it indicates that the second pressure sensor is malfunctioning.

Specifically, if the difference between the first pressure value and the second pressure value is not within the preset pressure range, it indicates that the difference between the second pressure value and the normal atmospheric pressure value is too large, that is, the difference between the pressure value detected by the second pressure sensor and the atmospheric pressure value is too large. Specifically, in the case where the engine is in the first operating state and there is no line fault in both the first pressure sensor and the second pressure sensor, the pressure value detected by the second pressure sensor (i.e., the second pressure value) should be equal to the normal atmospheric pressure value. Thus, the first processing module may determine that the second pressure sensor (i.e., the post-cold pressure sensor) is malfunctioning when the second pressure value differs too much from the normal atmospheric pressure value.

In the technical scheme, the first processing module can judge whether the second pressure sensor (namely the intercooling rear pressure sensor of the engine) has a fault according to a first pressure value and a second pressure value detected under the condition that the engine is in a first working state and the first pressure sensor and the second pressure sensor do not have line faults, so that the condition that the air input of the engine is abnormal and the operation of the engine is unstable due to the fact that the pressure value output by the second pressure sensor is inaccurate is avoided. Meanwhile, in the technical scheme of the invention, additional electronic devices do not need to be added, namely, additional cost does not need to be added.

In the above technical solution, the fault diagnosis apparatus of the pressure sensor further includes a second processing module; the acquisition module is also used for acquiring the rotating speed value of the engine; the second processing module is used for confirming that the engine is in the first working state under the condition that the rotating speed value of the engine is equal to the rotating speed threshold value and the first preset duration is maintained.

In the technical scheme, before the first pressure value and the second pressure value are acquired by the acquisition module, the rotation speed value of the engine needs to be acquired by the acquisition module so as to judge whether the engine is in the first working state or not by the second processing module.

Specifically, the process that the second processing module judges whether the engine is in the first working state according to the rotating speed value of the engine is as follows: the second processing module judges whether the rotating speed value of the engine is equal to a rotating speed threshold value or not, and determines that the engine is in a first working state under the condition that the rotating speed value of the engine is equal to the rotating speed threshold value and the first preset time length is maintained. Specifically, the rotation speed threshold is generally set to 0, and the first preset time period is set to 30 seconds, that is, when the engine is in a stationary state and is maintained for 30 seconds, it is determined that the engine is in the first operating state.

In the technical scheme, the second processing module can confirm whether the engine is in the first working state or not according to the rotating speed value of the engine acquired by the acquisition module and the time length of the engine maintained at the rotating speed value. Specifically, when the engine is in the first working state, the second pressure value detected by the second pressure sensor is approximately equal to the atmospheric pressure, and therefore, the second processing module needs to judge the working state of the engine by acquiring the rotating speed value of the engine to ensure the accuracy of fault diagnosis of the pressure sensor according to the second pressure value in the subsequent steps.

In the above technical solution, the fault diagnosis apparatus of the pressure sensor further includes a third processing module; the acquisition module is also used for acquiring a first voltage value of the atmospheric pressure sensor and a second voltage value of the intercooled pressure sensor; the third processing module is used for confirming that no line fault exists in the atmospheric pressure sensor and the intercooled pressure sensor under the condition that the first voltage value and the second voltage value are both in the preset voltage range.

In the technical scheme, the line fault refers to an open-circuit fault or a short-circuit fault of a connection line between the first pressure sensor and the master controller of the engineering equipment and a connection line between the second pressure sensor and the master controller of the engineering equipment.

Specifically, the step of determining whether the first pressure sensor and the second pressure sensor have a line fault includes: the method comprises the steps that a first voltage value of a first pressure sensor and a second voltage value of a second pressure sensor are obtained through an obtaining module, and a third processing module judges whether line faults exist in the first pressure sensor and the second pressure sensor or not according to whether the first voltage value and the second voltage value are within a preset voltage range or not.

Specifically, when the third processing module determines that the first voltage value is out of the preset voltage range, it may be determined that the first pressure sensor has an open-circuit fault or a short-circuit fault. Specifically, if the first voltage value is smaller than the lower limit value of the preset voltage range, it indicates that the first pressure sensor has a line short-circuit fault; if the first voltage value is larger than the upper limit value of the preset voltage range, the open-circuit fault of the first pressure sensor is indicated.

Specifically, when the third processing module determines that the second voltage value is out of the preset voltage range, it may be determined that the second pressure sensor has an open-circuit fault or a short-circuit fault. Specifically, if the second voltage value is smaller than the lower limit value of the preset voltage range, it indicates that the second pressure sensor has a line short-circuit fault; and if the second voltage value is larger than the upper limit value of the preset voltage range, indicating that the second pressure sensor has an open-circuit fault.

Specifically, under the condition that the first voltage value and the second voltage value are both within the preset voltage range, the third processing module confirms that the first pressure sensor and the second pressure sensor have neither a line nor a short-circuit fault, namely, the first pressure sensor and the second pressure sensor have no line fault.

In the technical scheme, the third processing module can judge whether the first pressure sensor and the second pressure sensor have line faults according to the acquired first voltage value of the first pressure sensor and the acquired second voltage value of the second pressure sensor. Specifically, when there is no line fault in the first pressure sensor or the second pressure sensor, the pressure value (first pressure value) detected by the first pressure sensor and the pressure value (second pressure value) detected by the first pressure sensor have reference values. Therefore, the third processing module needs to determine whether the first pressure sensor and the second pressure sensor have line faults according to the first voltage value and the second voltage value, so as to ensure the accuracy of fault diagnosis of the pressure sensors according to the first pressure value and the second pressure value in the subsequent steps.

According to a third aspect of the present invention, a readable storage medium is provided, on which a program or instructions are stored, which when executed by a processor, implement the method for diagnosing a failure of a pressure sensor as set forth in the above-mentioned technical solution of the present invention. Therefore, the readable storage medium has all the beneficial effects of the method for diagnosing the fault of the pressure sensor provided by the technical scheme of the invention, and details are not repeated herein.

According to a fourth aspect of the present invention, an engineering device is provided, which includes the fault diagnosis apparatus of the pressure sensor according to the above technical solution of the present invention, and/or the readable storage medium according to the above technical solution of the present invention, so that the engineering device has all the beneficial effects of the fault diagnosis apparatus of the pressure sensor according to the above technical solution of the present invention and/or the readable storage medium according to the above technical solution of the present invention, and will not be described herein again.

It should be noted that the engineering equipment may be a heavy truck, a trailer, an excavator, a bulldozer, a road roller, a concrete pump truck and other mechanical operation equipment and vehicles.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 shows one of the flow diagrams of a method of fault diagnosis of a pressure sensor of an embodiment of the invention;

FIG. 2 is a second schematic flow chart of a method for diagnosing a failure of a pressure sensor according to an embodiment of the present invention;

FIG. 3 is a third schematic flow chart illustrating a method for diagnosing a failure of a pressure sensor in accordance with an embodiment of the present invention;

fig. 4 shows a schematic block diagram of a failure diagnosis apparatus of a pressure sensor of an embodiment of the present invention;

fig. 5 is a schematic flow chart showing an overall flow of a failure diagnosis method of a pressure sensor according to an embodiment of the present invention.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

The method, the apparatus, the storage medium, and the engineering device for diagnosing the fault of the pressure sensor according to the embodiments of the present invention are described in detail with reference to fig. 1 to 5 through specific embodiments and application scenarios thereof.

The first embodiment is as follows:

fig. 1 is a schematic flow chart illustrating a method for diagnosing a failure of a pressure sensor according to an embodiment of the present invention, wherein the method for diagnosing a failure includes:

step S102, when the engine is in a first working state and the first pressure sensor and the second pressure sensor have no line fault, acquiring a first pressure value output by the first pressure sensor and a second pressure value output by the second pressure sensor;

and step S104, confirming that the second pressure sensor has a fault under the condition that the difference value between the first pressure value and the second pressure value is not in the preset pressure range.

The first pressure sensor is an atmospheric pressure sensor in a controller of the engine, and the second pressure sensor is an intercooled pressure sensor of the engine.

It should be noted that the fault diagnosis method for the pressure sensor provided by the present invention is mainly used for fault diagnosis of an intercooled pressure sensor of an engine of an engineering device, and an execution subject of the fault diagnosis method for the pressure sensor provided by the present invention may be a fault diagnosis device for the pressure sensor.

In this embodiment, the fault diagnosis device can determine whether the second pressure sensor (i.e., the intercooled rear pressure sensor of the engine) has a fault according to the first pressure value and the second pressure value detected when the engine is in the first working state and the first pressure sensor and the second pressure sensor do not have a line fault, thereby avoiding the situation that the engine is unstable due to abnormal air intake of the engine caused by inaccurate pressure value output by the second pressure sensor. Meanwhile, in the embodiment of the invention, no additional electronic device is required to be added, namely no additional cost is required to be added.

Fig. 2 is a schematic flow chart illustrating a fault diagnosis method for a pressure sensor according to an embodiment of the present invention, wherein the fault diagnosis method includes:

step S202, obtaining a rotating speed value of the engine;

step S204, confirming that the engine is in a first working state under the condition that the rotating speed value of the engine is equal to the rotating speed threshold value and the first preset time length is maintained;

step S206, under the condition that the engine is in a first working state and the first pressure sensor and the second pressure sensor have no line fault, acquiring a first pressure value output by the first pressure sensor and a second pressure value output by the second pressure sensor;

and step S208, confirming that the second pressure sensor has a fault under the condition that the difference value between the first pressure value and the second pressure value is not in the preset pressure range.

In this embodiment, before the first pressure value and the second pressure value are obtained, the fault diagnosis device needs to obtain a rotation speed value of the engine to determine whether the engine is in the first working state.

Specifically, the process of the fault diagnosis device judging whether the engine is in the first working state according to the rotating speed value of the engine is as follows: the fault diagnosis device judges whether the rotating speed value of the engine is equal to the rotating speed threshold value or not, and determines that the engine is in a first working state under the condition that the rotating speed value of the engine is equal to the rotating speed threshold value and the first preset time duration is maintained. Specifically, the rotation speed threshold is generally set to 0, and the first preset time period is set to 30 seconds, that is, when the engine is in a stationary state and is maintained for 30 seconds, it is determined that the engine is in the first operating state.

In this embodiment, the failure diagnosing device is capable of confirming whether the engine is in the first operating state based on the acquired rotation speed value of the engine and a period of time for which the engine is maintained at the rotation speed value. Specifically, when the engine is in the first operating state, the second pressure value detected by the second pressure sensor is approximately equal to the atmospheric pressure, and therefore, the fault diagnosis device needs to judge the operating state of the engine by acquiring the rotation speed value of the engine to ensure the accuracy of fault diagnosis of the pressure sensor according to the second pressure value in the subsequent steps.

Fig. 3 is a schematic flow chart illustrating a fault diagnosis method for a pressure sensor according to an embodiment of the present invention, wherein the fault diagnosis method includes:

step S302, obtaining a rotating speed value of the engine;

step S304, confirming that the engine is in a first working state under the condition that the rotating speed value of the engine is equal to the rotating speed threshold value and the first preset time length is maintained;

step S306, acquiring a first voltage value of the first pressure sensor and a second voltage value of the second pressure sensor;

step S308, under the condition that the first voltage value and the second voltage value are both in a preset voltage range, determining that no line fault exists in the first pressure sensor and the second pressure sensor;

step S310, under the condition that the engine is in a first working state and the first pressure sensor and the second pressure sensor have no line fault, acquiring a first pressure value output by the first pressure sensor and a second pressure value output by the second pressure sensor;

in step S312, it is determined that the second pressure sensor has a fault when the difference between the first pressure value and the second pressure value is not within the preset pressure range.

In this embodiment, the line fault refers to an open-circuit fault or a short-circuit fault of a connection line of the first pressure sensor and the second pressure sensor to the overall controller of the engineering apparatus.

Specifically, the step of the fault diagnosis device determining whether there is a fault in the line between the first pressure sensor and the second pressure sensor is: the fault diagnosis device firstly acquires a first voltage value of the first pressure sensor and a second voltage value of the second pressure sensor, and then judges whether line faults exist in the first pressure sensor and the second pressure sensor according to whether the first voltage value and the second voltage value are in a preset voltage range.

In this embodiment, the failure diagnosing device is capable of determining whether there is a line failure in the first pressure sensor and the second pressure sensor based on the acquired first voltage value of the first pressure sensor and the acquired second voltage value of the second pressure sensor. Specifically, when there is no line fault in the first pressure sensor or the second pressure sensor, the pressure value (first pressure value) detected by the first pressure sensor and the pressure value (second pressure value) detected by the first pressure sensor have reference values. Therefore, the fault diagnosis device needs to judge whether the first pressure sensor and the second pressure sensor have line faults according to the first voltage value and the second voltage value so as to ensure the accuracy of fault diagnosis of the pressure sensors according to the first pressure value and the second pressure value in the subsequent steps.

In the above embodiment, the preset range of the pressure is not less than-0.5 bar and not more than 0.5 bar.

In this example, the pressure is preset in the range of-0.5 bar to 0.5 bar. Specifically, due to the accuracy of the sensor or the aging problem of the sensor in long-term use, the deviation range of plus or minus 0.5bar is set in the pressure preset range, so that the accuracy of fault diagnosis of the second pressure sensor according to the pressure preset range is improved.

In the above embodiment, the preset voltage range is greater than or equal to 0.5V and less than or equal to 4.5V.

In this embodiment, the preset voltage range is 0.5V to 4.5V, and specifically, the minimum value of the operating voltage for the pressure sensor provided in the engineering equipment is generally 0.5V, and the maximum value thereof is generally 4.5V, so that the preset voltage range is 0.5V to 4.5V, which improves the accuracy of confirming whether the line fault exists in the first pressure sensor and the second pressure sensor according to the preset voltage range.

Example two:

fig. 4 shows a schematic block diagram of a failure diagnosis apparatus of a pressure sensor according to an embodiment of the present invention, the failure diagnosis apparatus 400 of a pressure sensor including: an obtaining module 402, configured to obtain a first pressure value output by a first pressure sensor and a second pressure value output by a second pressure sensor when an engine is in a first working state and a line fault does not exist in the first pressure sensor and the second pressure sensor; the first processing module 404 is configured to determine that the second pressure sensor has a fault when a difference between the first pressure value and the second pressure value is not within a preset pressure range; the first pressure sensor is an atmospheric pressure sensor in a controller of the engine, and the second pressure sensor is used for indicating an intercooled pressure sensor of the engine.

It should be noted that the pressure sensor fault diagnosis apparatus 400 according to the present embodiment is mainly used for diagnosing a fault of an intercooled pressure sensor of an engine of a construction equipment.

Specifically, firstly, the working state of the engine and whether a line fault exists in the first pressure sensor and the second pressure sensor are judged, and under the condition that the engine is in the first working state and the line fault does not exist in the first pressure sensor and the second pressure sensor, a first pressure value detected by the first pressure sensor and a second pressure value detected by the second pressure sensor are obtained through the obtaining module 402.

Further, the first processing module 404 calculates a difference between the first pressure value and the second pressure value, and determines whether the second pressure sensor has a fault according to whether the difference is within a preset pressure preset range. Specifically, if the difference is not within the preset pressure range, it indicates that the second pressure sensor is malfunctioning.

Specifically, if the difference between the first pressure value and the second pressure value is not within the preset pressure range, it indicates that the difference between the second pressure value and the normal atmospheric pressure value is too large, that is, the difference between the pressure value detected by the second pressure sensor and the atmospheric pressure value is too large. Specifically, in the case where the engine is in the first operating state and there is no line fault in both the first pressure sensor and the second pressure sensor, the pressure value detected by the second pressure sensor (i.e., the second pressure value) should be equal to the normal atmospheric pressure value. Thus, the first processing module 404 may determine that the second pressure sensor (i.e., the post-cold pressure sensor) is malfunctioning when the second pressure value is too different from the normal atmospheric pressure value.

In this embodiment, the first processing module 404 can determine whether the second pressure sensor (i.e., the intercooling rear pressure sensor of the engine) has a fault according to the first pressure value and the second pressure value detected when the engine is in the first operating state and the first pressure sensor and the second pressure sensor do not have a line fault, so as to avoid the situation that the intake air amount of the engine is abnormal and the operation of the engine is unstable due to inaccurate pressure value output by the second pressure sensor. Meanwhile, in the embodiment of the invention, no additional electronic device is required to be added, namely no additional cost is required to be added.

In the above embodiment, the failure diagnosis apparatus 400 for a pressure sensor further includes the second processing module 406; the obtaining module 402 is further configured to obtain a rotation speed value of the engine; the second processing module 406 is configured to confirm that the engine is in the first operating state when the speed value of the engine is equal to the speed threshold and is maintained for a first predetermined period of time.

In this embodiment, before the obtaining module 402 obtains the first pressure value and the second pressure value, the obtaining module 402 needs to obtain a rotation speed value of the engine to determine whether the engine is in the first operating state through the second processing module 406.

Specifically, the process of the second processing module 406 determining whether the engine is in the first working state according to the rotation speed value of the engine is as follows: the second processing module 406 determines whether the speed value of the engine is equal to a speed threshold, and determines that the engine is in a first operating state if the speed value of the engine is equal to the speed threshold and is maintained for a first predetermined period. Specifically, the rotation speed threshold is generally set to 0, and the first preset time period is set to 30 seconds, that is, when the engine is in a stationary state and is maintained for 30 seconds, it is determined that the engine is in the first operating state.

In this embodiment, the second processing module 406 may be configured to determine whether the engine is in the first operating state based on the engine speed value obtained by the obtaining module 402 and a duration of time that the engine is maintained at the engine speed value. Specifically, when the engine is in the first operating state, the second pressure value detected by the second pressure sensor is approximately equal to the atmospheric pressure, and therefore, the second processing module 406 needs to determine the operating state of the engine by acquiring the rotation speed value of the engine to ensure the accuracy of the fault diagnosis of the pressure sensor according to the second pressure value in the subsequent step.

In the above embodiment, the failure diagnosis apparatus 400 for a pressure sensor further includes the third processing module 408; the obtaining module 402 is further configured to obtain a first voltage value of the atmospheric pressure sensor and a second voltage value of the intercooled pressure sensor; the third processing module 408 is configured to confirm that no line fault exists in the atmospheric pressure sensor and the post-intercooling pressure sensor when both the first voltage value and the second voltage value are within the preset voltage range.

Specifically, the step of determining whether the first pressure sensor and the second pressure sensor have a line fault includes: first, a first voltage value of the first pressure sensor and a second voltage value of the second pressure sensor are obtained through the obtaining module 402, and the third processing module 408 determines whether a line fault exists in the first pressure sensor and the second pressure sensor according to whether the first voltage value and the second voltage value are within a preset voltage range.

Specifically, when the third processing module 408 determines that the first voltage value is outside the preset voltage range, it may be determined that the first pressure sensor has an open-circuit fault or a short-circuit fault. Specifically, if the first voltage value is smaller than the lower limit value of the preset voltage range, it indicates that the first pressure sensor has a line short-circuit fault; if the first voltage value is larger than the upper limit value of the preset voltage range, the open-circuit fault of the first pressure sensor is indicated.

Specifically, when the third processing module 408 determines that the second voltage value is outside the preset voltage range, it may be determined that the second pressure sensor has an open-circuit fault or a short-circuit fault. Specifically, if the second voltage value is smaller than the lower limit value of the preset voltage range, it indicates that the second pressure sensor has a line short-circuit fault; and if the second voltage value is larger than the upper limit value of the preset voltage range, indicating that the second pressure sensor has an open-circuit fault.

Specifically, under the condition that the first voltage value and the second voltage value are both within the preset voltage range, the third processing module 408 determines that the first pressure sensor and the second pressure sensor do not have a line or a short-circuit fault, that is, the first pressure sensor and the second pressure sensor do not have a line fault.

In this embodiment, the third processing module 408 can determine whether there is a line fault in the first pressure sensor and the second pressure sensor according to the acquired first voltage value of the first pressure sensor and the acquired second voltage value of the second pressure sensor. Specifically, when there is no line fault in the first pressure sensor or the second pressure sensor, the pressure value (first pressure value) detected by the first pressure sensor and the pressure value (second pressure value) detected by the first pressure sensor have reference values. Therefore, the third processing module 408 needs to determine whether the first pressure sensor and the second pressure sensor have a line fault according to the first voltage value and the second voltage value, so as to ensure the accuracy of performing fault diagnosis on the pressure sensor according to the first pressure value and the second pressure value in the subsequent steps.

In the above embodiment, the preset range of the pressure is-0.5 bar or more and 0.5bar or less.

Example three:

according to a third embodiment of the present invention, there is provided a readable storage medium on which a program or instructions are stored, the program or instructions, when executed by a processor, implementing the method of diagnosing a failure of a pressure sensor as set forth in the above-described embodiments. Therefore, the readable storage medium has all the advantages of the method for diagnosing the fault of the pressure sensor according to the above embodiment, and will not be described herein again.

Example four:

according to a fourth embodiment of the present invention, an engineering device is provided, which includes the failure diagnosis apparatus for a pressure sensor according to the above-mentioned embodiment of the present invention, and/or the readable storage medium according to the above-mentioned embodiment of the present invention, so that the engineering device has all the advantages of the failure diagnosis apparatus for a pressure sensor according to the above-mentioned embodiment of the present invention and/or the readable storage medium according to the above-mentioned embodiment of the present invention, which are not described herein again.

For example, the engineering equipment may be mechanical operation equipment such as heavy trucks, trailers, excavators, driving and anchoring machines, bulldozers, road rollers, concrete pump trucks and vehicles.

Example five:

the present embodiment exemplarily illustrates a method for diagnosing a failure of a pressure sensor according to the present invention with reference to fig. 5.

As shown in fig. 5, the steps of the method for diagnosing a fault of a pressure sensor provided in this embodiment specifically include:

step S502, whether the rotating speed of the engine is 0 or not and whether the engine stops working and is in a static state or not is maintained for 30 seconds or not; if yes, go to step S504, otherwise end the process;

step S504, whether an open circuit and a short circuit fault exist in the atmospheric pressure sensor and the intercooled pressure sensor; if yes, the flow is ended, and if no, step S506 is executed;

step S506, whether the difference value between the pressure value output by the atmospheric pressure sensor and the pressure value output by the intercooled pressure sensor is within the range of plus or minus 0.5bar or not is judged; if yes, the flow is ended, and if no, step S508 is executed;

and step S508, confirming that the pressure sensor has a fault after the inter-cooling.

It should be noted that the atmospheric pressure sensor corresponds to the first pressure sensor, the intercooled pressure sensor corresponds to the second pressure sensor, the pressure value output by the atmospheric pressure sensor corresponds to the first pressure value, and the pressure value output by the intercooled pressure sensor corresponds to the second pressure value.

In this embodiment, the failure diagnosis means first confirms whether the engine speed is 0, whether the engine stop operation is maintained in a stationary state for 30 seconds, and determines whether there is an open circuit or short circuit failure in the atmospheric pressure sensor and the after-cold sensor when it is confirmed that the engine speed is 0 and maintained for 30 seconds.

Further, under the condition that the fault diagnosis device judges that the atmospheric pressure sensor and the intercooled pressure sensor have no open circuit or short circuit fault, whether the difference value between the pressure value output by the atmospheric pressure sensor and the pressure value output by the intercooled pressure sensor is within the range of plus or minus 0.5bar or not is judged.

Further, the fault diagnosis device determines that the intercooled pressure sensor has a fault under the condition that the difference value between the pressure value output by the atmospheric pressure sensor and the pressure value output by the intercooled pressure sensor is judged to be out of the range of plus or minus 0.5 bar.

In the description herein, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly stated or limited otherwise; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method of diagnosing a failure of a pressure sensor, comprising:

under the condition that the engine is in a first working state and the first pressure sensor and the second pressure sensor have no line fault, acquiring a first pressure value output by the first pressure sensor and a second pressure value output by the second pressure sensor;

confirming that the second pressure sensor has a fault under the condition that the difference value between the first pressure value and the second pressure value is not in a preset pressure range;

wherein the first pressure sensor is an atmospheric pressure sensor in a controller of the engine, and the second pressure sensor is a post-intercooling pressure sensor of the engine.

2. The method for diagnosing the malfunction of the pressure sensor according to claim 1, wherein before the obtaining of the first pressure value output by the first pressure sensor and the second pressure value output by the second pressure sensor in the case where the engine is in the first operating state and the first pressure sensor and the second pressure sensor are both free from the line fault, the method for diagnosing the malfunction further comprises:

acquiring a rotating speed value of the engine;

and confirming that the engine is in a first working state under the condition that the rotating speed value of the engine is equal to the rotating speed threshold value and is maintained for a first preset time period.

3. The method of diagnosing a malfunction of a pressure sensor according to claim 2, wherein the method of diagnosing a malfunction further includes, after confirming that the engine is in the first operating state:

acquiring a first voltage value of the first pressure sensor and a second voltage value of the second pressure sensor;

and under the condition that the first voltage value and the second voltage value are both in a preset voltage range, determining that no line fault exists in the first pressure sensor and the second pressure sensor.

4. The method of diagnosing a malfunction of a pressure sensor according to claim 1, wherein the preset range of the pressure is-0.5 bar or more and 0.5bar or less.

5. The method of diagnosing a malfunction of a pressure sensor according to claim 3, wherein the preset range of voltage is 0.5V or more and 4.5V or less.

6. A failure diagnosis device of a pressure sensor, characterized in that the failure diagnosis device is used for diagnosing a second pressure sensor of an engine, and comprises:

the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring a first pressure value output by a first pressure sensor and a second pressure value output by a second pressure sensor under the condition that an engine is in a first working state and the first pressure sensor and the second pressure sensor do not have line faults;

the first processing module is used for confirming that the second pressure sensor has a fault under the condition that the difference value between the first pressure value and the second pressure value is not in a preset pressure range;

wherein the first pressure sensor is an atmospheric pressure sensor in a controller of the engine and the second pressure sensor is indicated as an intercooled pressure sensor of the engine.

7. The apparatus of claim 6, further comprising a second processing module;

the acquisition module is further used for acquiring a rotating speed value of the engine;

the second processing module is used for confirming that the engine is in a first working state under the condition that the rotating speed value of the engine is equal to the rotating speed threshold value and a first preset time length is maintained.

8. The apparatus of claim 6, further comprising a third processing module;

the acquisition module is further used for acquiring a first voltage value of the atmospheric pressure sensor and a second voltage value of the intercooled pressure sensor;

the third processing module is used for confirming that no line fault exists in the atmospheric pressure sensor and the intercooled pressure sensor under the condition that the first voltage value and the second voltage value are both in a preset voltage range.

9. A readable storage medium, characterized in that the readable storage medium stores thereon a program or instructions which, when executed by a processor, implement the steps of the method of fault diagnosis of a pressure sensor according to any one of claims 1 to 5.

10. An engineering apparatus, comprising:

a failure diagnosing device of the pressure sensor according to any one of claims 6 to 8; and/or

The readable storage medium of claim 9.