CN110145398B - Diesel engine detection method and device - Google Patents
Diesel engine detection method and device Download PDFInfo
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- CN110145398B CN110145398B CN201910602580.4A CN201910602580A CN110145398B CN 110145398 B CN110145398 B CN 110145398B CN 201910602580 A CN201910602580 A CN 201910602580A CN 110145398 B CN110145398 B CN 110145398B
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- 238000001514 detection method Methods 0.000 title claims description 24
- 238000000034 method Methods 0.000 claims abstract description 36
- 230000002159 abnormal effect Effects 0.000 claims description 78
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 52
- 239000000446 fuel Substances 0.000 claims description 28
- 238000002347 injection Methods 0.000 claims description 28
- 239000007924 injection Substances 0.000 claims description 28
- 238000012937 correction Methods 0.000 claims description 24
- 238000012545 processing Methods 0.000 claims description 12
- 238000012360 testing method Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
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Abstract
The invention provides a method and a device for detecting a diesel engine, wherein the method comprises the following steps: acquiring operating parameters of the diesel engine, wherein the operating parameters at least comprise the rotating speed of the engine; determining a crankcase pressure of the diesel engine based at least on the engine speed, and determining an exhaust back pressure of the diesel engine based at least on the engine speed, and calculating a speed change rate of the diesel engine according to the engine speed; and judging whether the diesel engine is in a cylinder pulling state or not at least based on the crankcase pressure, the exhaust back pressure and the rotating speed change rate. Based on the invention, whether the cylinder of the diesel engine is pulled can be quickly judged under the condition of not additionally adding any sensor, the diesel engine is prevented from being further damaged, the timeliness of service is improved, and the satisfaction degree of customers is improved.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a method and a device for detecting a diesel engine.
Background
Due to the reasons that abnormal abrasion of a piston, a cylinder and the like is caused by improper assembly or the diesel engine runs under abnormal working conditions of over-temperature, heavy load and the like for a long time, the problem of cylinder scuffing is easy to occur to the diesel engine. If the problem cannot be solved in time, the diesel engine is easy to damage and even discard.
At the present stage, diagnosis can be performed only after the cylinder cover is manually removed, the operation is complex, the consumed time is long, and the service timeliness is influenced.
Disclosure of Invention
In view of the above, the present invention provides an engine detection method and apparatus to solve the above problems. The technical scheme is as follows:
a diesel engine detection method, the method comprising:
acquiring operating parameters of a diesel engine, wherein the operating parameters at least comprise engine rotating speed;
determining a crankcase pressure of the diesel engine based at least on the engine speed, and an exhaust back pressure of the diesel engine based at least on the engine speed, and calculating a rate of change of speed of the diesel engine as a function of the engine speed;
and judging whether the diesel engine is in a cylinder pulling state or not at least based on the crankcase pressure, the exhaust back pressure and the rotating speed change rate.
Preferably, the determining a crankcase pressure of the diesel engine based at least on the engine speed comprises:
acquiring the fuel injection quantity of the diesel engine from the operation parameters;
and determining the crankcase pressure of the diesel engine according to the engine speed and the fuel injection quantity.
Preferably, the method further comprises:
acquiring the water temperature of the diesel engine from the operation parameters;
determining a crankcase pressure correction coefficient corresponding to the water temperature;
and correcting the crankcase pressure by using the crankcase pressure correction coefficient.
Preferably, said determining an exhaust back pressure of said diesel engine based at least on said engine speed comprises:
acquiring the fuel injection quantity of the diesel engine from the operation parameters;
and determining the exhaust back pressure of the diesel engine according to the engine speed and the fuel injection quantity.
Preferably, the method further comprises:
acquiring the water temperature of the diesel engine from the operation parameters;
determining an exhaust back pressure correction coefficient corresponding to the water temperature;
and correcting the exhaust back pressure by using the exhaust back pressure correction coefficient.
Preferably, the determining whether the diesel engine is in a cylinder pulling state based on at least the crankcase pressure, the exhaust back pressure and the rotation speed change rate includes:
judging whether the crankcase pressure is greater than a crankcase pressure threshold value, whether the exhaust back pressure is less than an exhaust back pressure threshold value and whether the rotating speed change rate is less than a rotating speed change rate threshold value;
if the crankcase pressure is not larger than the crankcase pressure threshold value, or the exhaust back pressure is not smaller than the exhaust back pressure threshold value, or the rotating speed change rate is not smaller than the rotating speed change rate threshold value, determining that the diesel engine is in a non-cylinder pulling state;
if the crankcase pressure is greater than the crankcase pressure threshold value, the exhaust back pressure is less than the exhaust back pressure threshold value, and the rotating speed change rate is less than the rotating speed change rate threshold value, judging whether the crankcase pressure is in an abnormal crankcase pressure range or not and whether the exhaust back pressure is in an abnormal exhaust back pressure range or not; wherein the abnormal crankcase pressure range and the abnormal exhaust back pressure range are both determined based on a scuffing test and are both determined at least by the engine speed;
if the crankcase pressure is in the abnormal crankcase pressure range and the exhaust back pressure is in the abnormal exhaust back pressure range, determining that the diesel engine is in a cylinder pulling state;
and if the crankcase pressure is not in the abnormal crankcase pressure range or the exhaust back pressure is not in the abnormal exhaust back pressure range, determining that the diesel engine is in a non-cylinder pulling state.
Preferably, the method further comprises:
acquiring the opening degree of an accelerator pedal, the working state of the diesel engine, the water temperature and the load rate from the operation parameters;
judging whether the opening degree of the accelerator pedal is within a preset opening degree allowable range, whether the diesel engine is in a starting state, whether the water temperature is within a preset water temperature allowable range and whether the load rate is greater than a load rate threshold value;
if the opening degree of the accelerator pedal is within the preset opening degree allowable range, the diesel engine is in a starting state, the water temperature is within the preset water temperature allowable range, and the load rate is larger than the load rate threshold value, executing the steps of determining the crankcase pressure of the diesel engine at least based on the engine speed, determining the exhaust back pressure of the diesel engine at least based on the engine speed, and calculating the speed change rate of the diesel engine according to the engine speed.
A diesel engine detection device, the device comprising:
the system comprises a parameter acquisition module, a parameter acquisition module and a parameter processing module, wherein the parameter acquisition module is used for acquiring operating parameters of the diesel engine, and the operating parameters at least comprise engine rotating speed;
a processing module for determining a crankcase pressure of the diesel engine based at least on the engine speed, and an exhaust back pressure of the diesel engine based at least on the engine speed, and calculating a rate of change of speed of the diesel engine as a function of the engine speed;
the first judging module is used for judging whether the diesel engine is in a cylinder pulling state or not at least based on the crankcase pressure, the exhaust back pressure and the rotating speed change rate.
Preferably, the first determining module is specifically configured to:
judging whether the crankcase pressure is greater than a crankcase pressure threshold value, whether the exhaust back pressure is less than an exhaust back pressure threshold value and whether the rotating speed change rate is less than a rotating speed change rate threshold value; if the crankcase pressure is not larger than the crankcase pressure threshold value, or the exhaust back pressure is not smaller than the exhaust back pressure threshold value, or the rotating speed change rate is not smaller than the rotating speed change rate threshold value, determining that the diesel engine is in a non-cylinder pulling state; if the crankcase pressure is greater than the crankcase pressure threshold value, the exhaust back pressure is less than the exhaust back pressure threshold value, and the rotating speed change rate is less than the rotating speed change rate threshold value, judging whether the crankcase pressure is in an abnormal crankcase pressure range or not and whether the exhaust back pressure is in an abnormal exhaust back pressure range or not; wherein the abnormal crankcase pressure range and the abnormal exhaust back pressure range are both determined based on a scuffing test and are both determined at least by the engine speed; if the crankcase pressure is in the abnormal crankcase pressure range and the exhaust back pressure is in the abnormal exhaust back pressure range, determining that the diesel engine is in a cylinder pulling state; and if the crankcase pressure is not in the abnormal crankcase pressure range or the exhaust back pressure is not in the abnormal exhaust back pressure range, determining that the diesel engine is in a non-cylinder pulling state.
Preferably, the apparatus further comprises:
the second judgment module is used for acquiring the opening degree of an accelerator pedal, the working state of the diesel engine, the water temperature and the load rate from the operation parameters; judging whether the opening degree of the accelerator pedal is within a preset opening degree allowable range, whether the diesel engine is in a starting state, whether the water temperature is within a preset water temperature allowable range and whether the load rate is greater than a load rate threshold value; and if the opening degree of the accelerator pedal is within the preset opening degree allowable range, the diesel engine is in a starting state, the water temperature is within the preset water temperature allowable range, and the load rate is greater than the load rate threshold value, triggering the processing module.
The diesel engine detection method provided by the invention can determine the pressure of the crankcase, the exhaust back pressure and the rotating speed change rate based on the operation parameters of the diesel engine, and further judge whether the diesel engine is in the cylinder pulling state based on at least the pressure of the crankcase, the exhaust back pressure and the rotating speed change rate. Based on the invention, whether the cylinder of the diesel engine is pulled can be quickly judged under the condition of not additionally adding any sensor, the diesel engine is prevented from being further damaged, the timeliness of service is improved, and the satisfaction degree of customers is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a method of detecting a diesel engine according to an embodiment of the present disclosure;
FIG. 2 is a flow chart of another method of a diesel engine detection method disclosed in an embodiment of the present invention;
FIG. 3 is a flow chart of another method of a diesel engine detection method according to an embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of a diesel engine detection device according to an embodiment of the disclosure;
fig. 5 is another schematic structural diagram of a diesel engine detection device according to an embodiment of the disclosure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a diesel engine detection method, which is applied to an engine controller ECU, and the flow chart of the method is shown in FIG. 1, and the method comprises the following steps:
s10, obtaining the operation parameters of the diesel engine, wherein the operation parameters at least comprise the engine speed.
In the embodiment, the ECU may obtain the operation parameters representing the operation condition of the diesel engine, such as the engine speed, the fuel injection amount, the water temperature, the working state, the load factor, the accelerator pedal opening degree, and the like, through the signals fed back by the sensors arranged on the diesel engine and through calculation.
S20, determining a crankcase pressure of the diesel engine at least based on the engine speed, determining an exhaust back pressure of the diesel engine at least based on the engine speed, and calculating a speed change rate of the diesel engine according to the engine speed.
In this embodiment, the crankcase pressure and the exhaust back pressure corresponding to different operating parameters of the diesel engine may be obtained in advance, and the corresponding relationship between the operating parameter and the crankcase pressure and the corresponding relationship between the operating parameter and the exhaust back pressure are stored in the ECU in the form of a MAP table or a curve, where the operating parameter at least includes the engine speed.
Therefore, in the actual detection, the ECU may determine the crankcase pressure in the current operation condition based on the correspondence relationship between the operation parameter and the crankcase pressure, and determine the exhaust back pressure in the current operation condition based on the correspondence relationship between the operation parameter and the exhaust back pressure.
In the process that the ECU determines the crankcase pressure under the current operation working condition based on the corresponding relation between the operation parameters and the crankcase pressure, the fuel injection quantity of the diesel engine can be obtained from the operation parameters, and then the corresponding crankcase pressure is determined according to the engine rotating speed and the fuel injection quantity. In this embodiment, a three-dimensional curve of the engine speed, the fuel injection amount, and the crankcase pressure may be preset, and then the corresponding crankcase pressure may be searched for from the three-dimensional curve.
Further, in order to improve the accuracy of the determined crankcase pressure, the ECU can obtain the water temperature of the diesel engine from the operation parameters, further determine a crankcase pressure correction coefficient corresponding to the water temperature, and finally correct the crankcase pressure by using the crankcase pressure correction coefficient. In this embodiment, a two-dimensional curve of the water temperature-crankcase pressure correction coefficient may be preset, and then the corresponding crankcase pressure correction coefficient may be searched from the two-dimensional curve, and finally the crankcase pressure correction coefficient is used to correct the crankcase pressure, and specifically, the product of the crankcase pressure correction coefficient and the crankcase pressure may be used as the final crankcase pressure.
In the process that the ECU determines the exhaust back pressure under the current operation working condition based on the corresponding relation between the operation parameters and the exhaust back pressure, the fuel injection quantity of the diesel engine can be obtained from the operation parameters, and then the corresponding exhaust back pressure is determined according to the engine rotating speed and the fuel injection quantity. In this embodiment, a three-dimensional curve of the engine speed, the fuel injection amount, and the exhaust back pressure may be preset, and then the corresponding exhaust back pressure may be searched from the three-dimensional curve.
Further, in order to improve the accuracy of the determined exhaust back pressure, the ECU may obtain the water temperature of the diesel engine from the operating parameters, further determine an exhaust back pressure correction coefficient corresponding to the water temperature, and finally correct the exhaust back pressure by using the exhaust back pressure correction coefficient. In this embodiment, a two-dimensional curve of the water temperature-exhaust back pressure correction coefficient may be preset, and then the corresponding exhaust back pressure correction coefficient may be searched from the two-dimensional curve, and finally the exhaust back pressure correction coefficient is used to correct the exhaust back pressure, specifically, the product of the exhaust back pressure correction coefficient and the exhaust back pressure may be used as the final exhaust back pressure.
In addition, the ECU may calculate, when calculating the rate of change of the rotational speed of the diesel engine, a ratio of a difference between the rotational speed of the engine at the present time and the rotational speed of the engine at the previous time to the time difference as the rate of change of the rotational speed based on the rotational speed of the engine acquired at the present time and the rotational speed of the engine acquired at the previous time.
And S30, judging whether the diesel engine is in a cylinder pulling state or not at least based on the crankcase pressure, the exhaust back pressure and the rotating speed change rate.
In this embodiment, a cylinder pulling state of the diesel engine under a high load, that is, a crankcase pressure threshold, an exhaust back pressure threshold, and a rotation speed change rate threshold during normal operation are preset, and if the crankcase pressure is greater than the crankcase pressure threshold, the exhaust back pressure is less than the exhaust back pressure threshold, and the rotation speed change rate is less than the rotation speed change rate threshold, it may be determined that the diesel engine is in the cylinder pulling state, otherwise, it may be determined that the diesel engine is in the cylinder pulling state.
In order to ensure the operation safety of the diesel engine, the ECU can control the fuel injection quantity of the diesel engine to be zero under the condition that the diesel engine is determined to be in the cylinder pulling state, namely the diesel engine is controlled to stop fuel injection, so that the diesel engine is flamed out.
In other embodiments, to improve the cylinder scuffing detection accuracy, the step S30 "determining whether the diesel engine is in the cylinder scuffing state based on at least the crankcase pressure, the exhaust back pressure and the rotation speed change rate" may adopt the following steps, where the method flowchart of the diesel engine detection method is as shown in fig. 2:
s301, judging whether the crankcase pressure is larger than a crankcase pressure threshold value, whether the exhaust back pressure is smaller than an exhaust back pressure threshold value and whether the rotating speed change rate is smaller than a rotating speed change rate threshold value.
S302, if the crankcase pressure is not larger than the crankcase pressure threshold value, or the exhaust back pressure is not smaller than the exhaust back pressure threshold value, or the rotating speed change rate is not smaller than the rotating speed change rate threshold value, it is determined that the diesel engine is in a non-cylinder pulling state.
S303, if the crankcase pressure is greater than the crankcase pressure threshold value, the exhaust back pressure is less than the exhaust back pressure threshold value, and the rotating speed change rate is less than the rotating speed change rate threshold value, judging whether the crankcase pressure is in an abnormal crankcase pressure range and whether the exhaust back pressure is in an abnormal exhaust back pressure range; wherein the abnormal crankcase pressure range and the abnormal exhaust back pressure range are determined based on a cylinder pulling test and are determined at least by the engine speed.
In this embodiment, the operating parameters of the diesel engine, the abnormal crankcase pressure and the abnormal exhaust back pressure at the time when the cylinder pulling fault occurs in the diesel engine can be determined through a cylinder pulling test, so that the corresponding relationship between the operating parameters and the abnormal crankcase pressure and the corresponding relationship between the operating parameters and the abnormal exhaust back pressure are stored in the ECU in the form of an MPA table or a curve, and the operating parameters at least include the engine speed.
Therefore, in the actual detection, the ECU may determine the abnormal crankcase pressure in the current operation condition based on the correspondence relationship between the operation parameter and the abnormal crankcase pressure, and determine the abnormal exhaust back pressure in the current operation condition based on the correspondence relationship between the operation parameter and the abnormal exhaust back pressure.
In the process that the ECU determines the abnormal crankcase pressure under the current operation working condition based on the corresponding relation between the operation parameters and the abnormal crankcase pressure, the fuel injection quantity of the diesel engine can be obtained from the operation parameters, and then the corresponding abnormal crankcase pressure is determined according to the engine rotating speed and the fuel injection quantity. In this embodiment, a three-dimensional curve of the engine speed, the fuel injection amount, and the abnormal crankcase pressure may be preset, and the corresponding abnormal crankcase pressure may be searched from the three-dimensional curve.
In the process that the ECU determines the abnormal exhaust back pressure under the current operation working condition based on the corresponding relation between the operation parameters and the abnormal exhaust back pressure, the fuel injection quantity of the diesel engine can be obtained from the operation parameters, and then the abnormal exhaust back pressure of the diesel engine is determined according to the engine rotating speed and the fuel injection quantity. In this embodiment, a three-dimensional curve of the engine speed, the fuel injection amount and the abnormal exhaust back pressure may be preset, and the abnormal exhaust back pressure corresponding to the engine speed and the fuel injection amount in the operation parameters may be searched from the three-dimensional curve.
When the abnormal crankcase pressure range is determined based on the abnormal crankcase pressure, the abnormal crankcase pressure range may be determined by floating up and down by a certain range, for example, 10%, with the abnormal crankshaft pressure as a reference; also, when the abnormal exhaust back pressure range is determined based on the abnormal exhaust back pressure, the abnormal exhaust back pressure range may be determined by floating up and down by a certain range, for example, 15% with the abnormal exhaust back pressure as a reference.
S304, if the crankcase pressure is in the abnormal crankcase pressure range and the exhaust back pressure is in the abnormal exhaust back pressure range, the diesel engine is determined to be in a cylinder pulling state.
In this embodiment, to prevent erroneous determination due to instantaneous cylinder scuffing, the timer may be started when the first crankcase pressure is within the abnormal crankcase pressure range and the exhaust back pressure is within the abnormal exhaust back pressure range, and the timer may not be closed until it is determined that the diesel engine is in the non-scuffing state. And if the timing of the timer is greater than the preset fault confirmation time, determining that the diesel engine is in a cylinder pulling state, otherwise, determining that the diesel engine is in a non-cylinder pulling state.
S305, if the crankcase pressure is not in the abnormal crankcase pressure range or the exhaust back pressure is not in the abnormal exhaust back pressure range, determining that the diesel engine is in a non-cylinder pulling state.
In other embodiments, in order to ensure that the diesel engine is in a high-load condition and exclude misjudgment of other conditions such as a low-load condition and a normal condition, on the basis of the diesel engine detection method shown in fig. 1, the method further includes the following steps, and at this time, a flow chart of the method of the diesel engine detection method is shown in fig. 3:
and S40, acquiring the opening degree of an accelerator pedal, the working state of the diesel engine, the water temperature and the load rate from the operation parameters.
And S50, judging whether the opening of the accelerator pedal is within a preset opening allowable range, whether the diesel engine is in a starting state, whether the water temperature is within a preset water temperature allowable range and whether the load rate is greater than a load rate threshold value. If the opening degree of the accelerator pedal is within the preset opening degree allowable range, the diesel engine is in a starting state, the water temperature is within the preset water temperature allowable range, and the load rate is greater than the load rate threshold value, step S20 is executed.
In this embodiment, the upper limit and the lower limit of the accelerator pedal opening, the upper limit and the lower limit of the water temperature, and the minimum load factor when the diesel engine is in the non-scuffing state under high load are set in advance. The opening degree allowable range is determined by the upper limit and the lower limit of the opening degree of the accelerator pedal, the water temperature allowable range is determined by the upper limit and the lower limit of the water temperature, and the load factor threshold is determined by the minimum load factor.
The diesel engine detection method provided by the embodiment of the invention can determine the pressure of the crankcase, the exhaust back pressure and the rotating speed change rate based on the operation parameters of the diesel engine, and further judge whether the diesel engine is in a cylinder pulling state or not at least based on the pressure of the crankcase, the exhaust back pressure and the rotating speed change rate. Based on the invention, whether the cylinder of the diesel engine is pulled can be quickly judged under the condition of not additionally adding any sensor, the diesel engine is prevented from being further damaged, the timeliness of service is improved, and the satisfaction degree of customers is improved.
Based on the diesel engine detection method provided by the above embodiment, an embodiment of the present invention correspondingly provides an apparatus for performing the diesel engine detection method, where a schematic structural diagram of the apparatus is shown in fig. 4, and the apparatus includes:
the parameter acquiring module 10 is used for acquiring the operating parameters of the diesel engine, wherein the operating parameters at least comprise the engine rotating speed.
The processing module 20 is configured to determine a crankcase pressure of the diesel engine based at least on the engine speed, determine an exhaust back pressure of the diesel engine based at least on the engine speed, and calculate a rate of change of the speed of the diesel engine based on the engine speed.
The first judging module 30 is used for judging whether the diesel engine is in a cylinder pulling state or not at least based on the crankcase pressure, the exhaust back pressure and the rotating speed change rate.
Optionally, the processing module 20 for determining a crankcase pressure of the diesel engine based at least on the engine speed is specifically configured to:
acquiring the fuel injection quantity of the diesel engine from the operation parameters; and determining the crankcase pressure of the diesel engine according to the engine speed and the fuel injection quantity.
Optionally, the processing module 20 is further configured to:
acquiring the water temperature of the diesel engine from the operation parameters; determining a crankcase pressure correction coefficient corresponding to the water temperature; the crankcase pressure is corrected using the crankcase pressure correction factor.
Optionally, the processing module 20 for determining an exhaust back pressure of the diesel engine based at least on the engine speed is specifically configured to:
acquiring the fuel injection quantity of the diesel engine from the operation parameters; and determining the exhaust back pressure of the diesel engine according to the engine speed and the fuel injection quantity.
Optionally, the processing module 20 is further configured to:
acquiring the water temperature of the diesel engine from the operation parameters; determining an exhaust back pressure correction coefficient corresponding to the water temperature; the exhaust back pressure is corrected by an exhaust back pressure correction coefficient.
Optionally, the first determining module 30 is specifically configured to:
judging whether the pressure of a crankcase is greater than a pressure threshold value of the crankcase, whether the exhaust back pressure is less than an exhaust back pressure threshold value and whether the rotating speed change rate is less than a rotating speed change rate threshold value; if the pressure of the crankcase is not greater than the pressure threshold value of the crankcase, or the exhaust back pressure is not less than the exhaust back pressure threshold value, or the rotating speed change rate is not less than the rotating speed change rate threshold value, determining that the diesel engine is in a non-cylinder pulling state; if the crankcase pressure is greater than the crankcase pressure threshold value, the exhaust back pressure is less than the exhaust back pressure threshold value and the rotating speed change rate is less than the rotating speed change rate threshold value, whether the crankcase pressure is in an abnormal crankcase pressure range or not and whether the exhaust back pressure is in an abnormal exhaust back pressure range or not are judged; wherein the abnormal crankcase pressure range and the abnormal exhaust back pressure range are determined based on a cylinder pulling test and are determined by at least the engine speed; if the crankcase pressure is in the abnormal crankcase pressure range and the exhaust back pressure is in the abnormal exhaust back pressure range, determining that the diesel engine is in a cylinder pulling state; and if the crankcase pressure is not in the abnormal crankcase pressure range or the exhaust back pressure is not in the abnormal exhaust back pressure range, determining that the diesel engine is in a non-cylinder pulling state.
Optionally, the diesel engine detection device shown in fig. 5 further includes:
the second judgment module 40 is used for acquiring the opening degree of an accelerator pedal, the working state of the diesel engine, the water temperature and the load rate from the operation parameters; judging whether the opening degree of an accelerator pedal is within a preset opening degree allowable range, whether a diesel engine is in a starting state, whether water temperature is within a preset water temperature allowable range and whether a load rate is greater than a load rate threshold value; if the opening degree of the accelerator pedal is within a preset opening degree allowable range, the diesel engine is in a starting state, the water temperature is within a preset water temperature allowable range, and the load rate is greater than the load rate threshold value, the processing module 20 is triggered.
The diesel engine detection device provided by the embodiment of the invention can determine the pressure of the crankcase, the exhaust back pressure and the rotating speed change rate based on the operation parameters of the diesel engine, and further judge whether the diesel engine is in a cylinder pulling state or not based on at least the pressure of the crankcase, the exhaust back pressure and the rotating speed change rate. Based on the invention, whether the cylinder of the diesel engine is pulled can be quickly judged under the condition of not additionally adding any sensor, the diesel engine is prevented from being further damaged, the timeliness of service is improved, and the satisfaction degree of customers is improved.
The diesel engine detection method and device provided by the invention are described in detail, specific examples are applied in the description to explain the principle and the implementation mode of the invention, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include or include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method of detecting a diesel engine, the method comprising:
acquiring operating parameters of a diesel engine, wherein the operating parameters at least comprise engine rotating speed;
determining a crankcase pressure of the diesel engine based at least on the engine speed, and an exhaust back pressure of the diesel engine based at least on the engine speed, and calculating a rate of change of speed of the diesel engine as a function of the engine speed;
and judging whether the diesel engine is in a cylinder pulling state or not at least based on the crankcase pressure, the exhaust back pressure and the rotating speed change rate.
2. The method of claim 1, wherein said determining a crankcase pressure of the diesel engine based at least on the engine speed comprises:
acquiring the fuel injection quantity of the diesel engine from the operation parameters;
and determining the crankcase pressure of the diesel engine according to the engine speed and the fuel injection quantity.
3. The method of claim 2, further comprising:
acquiring the water temperature of the diesel engine from the operation parameters;
determining a crankcase pressure correction coefficient corresponding to the water temperature;
and correcting the crankcase pressure by using the crankcase pressure correction coefficient.
4. The method of claim 1, wherein said determining an exhaust back pressure of said diesel engine based at least on said engine speed comprises:
acquiring the fuel injection quantity of the diesel engine from the operation parameters;
and determining the exhaust back pressure of the diesel engine according to the engine speed and the fuel injection quantity.
5. The method of claim 4, further comprising:
acquiring the water temperature of the diesel engine from the operation parameters;
determining an exhaust back pressure correction coefficient corresponding to the water temperature;
and correcting the exhaust back pressure by using the exhaust back pressure correction coefficient.
6. The method of claim 1, wherein said determining whether the diesel engine is in a scuffing state based on at least the crankcase pressure, the exhaust back pressure, and the rate of change of speed comprises:
judging whether the crankcase pressure is greater than a crankcase pressure threshold value, whether the exhaust back pressure is less than an exhaust back pressure threshold value and whether the rotating speed change rate is less than a rotating speed change rate threshold value;
if the crankcase pressure is not larger than the crankcase pressure threshold value, or the exhaust back pressure is not smaller than the exhaust back pressure threshold value, or the rotating speed change rate is not smaller than the rotating speed change rate threshold value, determining that the diesel engine is in a non-cylinder pulling state;
if the crankcase pressure is greater than the crankcase pressure threshold value, the exhaust back pressure is less than the exhaust back pressure threshold value, and the rotating speed change rate is less than the rotating speed change rate threshold value, judging whether the crankcase pressure is in an abnormal crankcase pressure range or not and whether the exhaust back pressure is in an abnormal exhaust back pressure range or not; wherein the abnormal crankcase pressure range and the abnormal exhaust back pressure range are both determined based on a scuffing test and are both determined at least by the engine speed;
if the crankcase pressure is in the abnormal crankcase pressure range and the exhaust back pressure is in the abnormal exhaust back pressure range, determining that the diesel engine is in a cylinder pulling state;
and if the crankcase pressure is not in the abnormal crankcase pressure range or the exhaust back pressure is not in the abnormal exhaust back pressure range, determining that the diesel engine is in a non-cylinder pulling state.
7. The method of claim 1, further comprising:
acquiring the opening degree of an accelerator pedal, the working state of the diesel engine, the water temperature and the load rate from the operation parameters;
judging whether the opening degree of the accelerator pedal is within a preset opening degree allowable range, whether the diesel engine is in a starting state, whether the water temperature is within a preset water temperature allowable range and whether the load rate is greater than a load rate threshold value;
if the opening degree of the accelerator pedal is within the preset opening degree allowable range, the diesel engine is in a starting state, the water temperature is within the preset water temperature allowable range, and the load rate is larger than the load rate threshold value, executing the steps of determining the crankcase pressure of the diesel engine at least based on the engine speed, determining the exhaust back pressure of the diesel engine at least based on the engine speed, and calculating the speed change rate of the diesel engine according to the engine speed.
8. A diesel engine detection device, characterized in that the device comprises:
the system comprises a parameter acquisition module, a parameter acquisition module and a parameter processing module, wherein the parameter acquisition module is used for acquiring operating parameters of the diesel engine, and the operating parameters at least comprise engine rotating speed;
a processing module for determining a crankcase pressure of the diesel engine based at least on the engine speed, and an exhaust back pressure of the diesel engine based at least on the engine speed, and calculating a rate of change of speed of the diesel engine as a function of the engine speed;
the first judging module is used for judging whether the diesel engine is in a cylinder pulling state or not at least based on the crankcase pressure, the exhaust back pressure and the rotating speed change rate.
9. The apparatus of claim 8, wherein the first determining module is specifically configured to:
judging whether the crankcase pressure is greater than a crankcase pressure threshold value, whether the exhaust back pressure is less than an exhaust back pressure threshold value and whether the rotating speed change rate is less than a rotating speed change rate threshold value; if the crankcase pressure is not larger than the crankcase pressure threshold value, or the exhaust back pressure is not smaller than the exhaust back pressure threshold value, or the rotating speed change rate is not smaller than the rotating speed change rate threshold value, determining that the diesel engine is in a non-cylinder pulling state; if the crankcase pressure is greater than the crankcase pressure threshold value, the exhaust back pressure is less than the exhaust back pressure threshold value, and the rotating speed change rate is less than the rotating speed change rate threshold value, judging whether the crankcase pressure is in an abnormal crankcase pressure range or not and whether the exhaust back pressure is in an abnormal exhaust back pressure range or not; wherein the abnormal crankcase pressure range and the abnormal exhaust back pressure range are both determined based on a scuffing test and are both determined at least by the engine speed; if the crankcase pressure is in the abnormal crankcase pressure range and the exhaust back pressure is in the abnormal exhaust back pressure range, determining that the diesel engine is in a cylinder pulling state; and if the crankcase pressure is not in the abnormal crankcase pressure range or the exhaust back pressure is not in the abnormal exhaust back pressure range, determining that the diesel engine is in a non-cylinder pulling state.
10. The apparatus of claim 8, further comprising:
the second judgment module is used for acquiring the opening degree of an accelerator pedal, the working state of the diesel engine, the water temperature and the load rate from the operation parameters; judging whether the opening degree of the accelerator pedal is within a preset opening degree allowable range, whether the diesel engine is in a starting state, whether the water temperature is within a preset water temperature allowable range and whether the load rate is greater than a load rate threshold value; and if the opening degree of the accelerator pedal is within the preset opening degree allowable range, the diesel engine is in a starting state, the water temperature is within the preset water temperature allowable range, and the load rate is greater than the load rate threshold value, triggering the processing module.
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| DE102021108740A1 (en) | 2021-04-08 | 2022-10-13 | Bayerische Motoren Werke Aktiengesellschaft | Determination of an exhaust back pressure of an internal combustion engine |
| CN114563140B (en) * | 2022-01-25 | 2024-04-19 | 东风汽车集团股份有限公司 | Tightness test method for engine crankcase |
| CN114673588B (en) * | 2022-03-09 | 2023-04-18 | 潍柴动力股份有限公司 | Method and device for judging engine operation fault |
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