CN112761807B - Fault diagnosis method, piston cooling system and vehicle - Google Patents
Fault diagnosis method, piston cooling system and vehicle Download PDFInfo
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- CN112761807B CN112761807B CN202110183104.0A CN202110183104A CN112761807B CN 112761807 B CN112761807 B CN 112761807B CN 202110183104 A CN202110183104 A CN 202110183104A CN 112761807 B CN112761807 B CN 112761807B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/16—Pistons having cooling means
- F02F3/20—Pistons having cooling means the means being a fluid flowing through or along piston
- F02F3/22—Pistons having cooling means the means being a fluid flowing through or along piston the fluid being liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/06—Arrangements for cooling pistons
- F01P3/10—Cooling by flow of coolant through pistons
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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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- 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
- F02B77/089—Safety, indicating or supervising devices relating to engine temperature
Abstract
The invention provides a fault diagnosis method, a piston cooling system and a vehicle. The fault diagnosis method comprises the following steps: judging whether the piston cooling assembly has the first rationality fault according to a characteristic signal within a first preset time after the engine oil control valve is opened; and judging whether the piston cooling assembly has the second rationality fault according to the characteristic signal within a second preset time after the engine oil control valve is closed. Whether the piston cooling assembly has faults or not is directly judged by analyzing the signal change of the characteristic signals after the engine oil control valve is opened and closed, the number of signal sources required for judging the faults is reduced, and the problems that a pressure switch is required to be additionally arranged, the cost is high, the requirement on the installation position of the pressure switch is high and the pressure switch needs additional diagnosis due to the pressure switch in a fault diagnosis method in the prior art are solved.
Description
Technical Field
The invention relates to the technical field of internal combustion engines, in particular to a fault diagnosis method, a piston cooling system and a vehicle.
Background
The operating environment of the engine is very harsh and therefore good cooling of the engine is necessary to ensure reliability, durability and economy of engine operation. Among them, the piston is one of the worst working parts in the engine, so it is now common to use a piston cooling nozzle to inject oil to reduce the heat load of the piston. With the development of engine technology, piston cooling nozzle technology and continuously variable oil pump technology are gradually becoming basic configurations of engines. Referring to fig. 1, fig. 1 is a schematic structural diagram of a piston cooling nozzle assembly. Taking a four-cylinder engine as an example, the piston cooling nozzle assembly includes an oil control valve 3, an auxiliary oil gallery 4 and piston cooling nozzles 5 of each cylinder, a continuously variable oil pump 1 is arranged in front of a main oil gallery 2, and an oil pressure sensor 6 is further arranged on the main oil gallery 2, as shown in fig. 1. The engine oil control valve 3 is divided into a mechanical type and an electromagnetic type according to a control mode, the working principle is similar, the controllability of the electromagnetic type engine oil control valve 3 is improved, but the engine oil control valve is still in an on-off type and the cost is higher.
The fault rationality diagnosis is to diagnose two rationality faults. The first is that when the piston needs to be cooled, oil cannot be injected normally, and the causes of such a failure include clogging at the oil control valve 3 or clogging of the auxiliary oil passage 4 and the following pipe. The second is that the oil injection can not be closed when the piston does not need to be cooled, and the fault causes oil leakage at the oil control valve 3.
Referring to fig. 2, fig. 2 is a logic diagram of a method for diagnosing the rationality of a fault. The conventional failure rationality diagnostic method is implemented by a pressure switch, i.e., a pressure switch (not shown in fig. 1) is installed on the sub-gallery 4. If the piston cooling nozzle is controlled to start oil injection, but the pressure of the auxiliary oil passage is not increased, and the signal output by the pressure switch is the same as that when the piston cooling nozzle does not inject oil, the first reasonable fault that the opening is not (fully) opened can be judged to occur; if the piston cooling nozzle is controlled to close the oil injection, but the pressure in the secondary oil passage 4 is not reduced, and the signal output by the pressure switch is the same as that when the piston cooling nozzle injects the oil, it can be determined that the second "this close is not (fully) closed" rational fault has occurred, and the diagnostic logic is as shown in fig. 2.
In summary, the fault diagnosis method in the prior art needs to be additionally provided with a pressure switch, and has the problems of high cost, high requirement on the installation position of the pressure switch, and additional diagnosis of the pressure switch.
Disclosure of Invention
The invention aims to provide a fault diagnosis method, a piston cooling system and a vehicle, and aims to solve the problems that a pressure switch needs to be additionally arranged in the fault diagnosis method in the prior art, the cost is high due to the pressure switch, the requirement on the installation position of the pressure switch is high, and the pressure switch needs additional diagnosis.
In order to solve the above technical problem, according to a first aspect of the present invention, there is provided a fault diagnosis method including the steps of:
judging whether the piston cooling assembly has the first rationality fault according to a characteristic signal within a first preset time after the engine oil control valve is opened;
and judging whether the piston cooling assembly has the second rationality fault according to the characteristic signal within a second preset time after the engine oil control valve is closed.
Optionally, the characteristic signal is an oil pressure signal in the main oil gallery or an oil pressure signal in the oil pump.
Optionally, the characteristic signal is a control signal of the continuously variable oil pump.
Optionally, the step of determining whether the first rationality fault exists in the piston cooling assembly comprises:
calculating a first statistical characteristic value of the characteristic signal within the first preset time length;
if the first statistical characteristic value exceeds a first threshold range, judging that the first rationality fault does not exist; otherwise, judging that the first rationality fault exists.
Optionally, the step of calculating the first statistical characteristic value includes calculating an average value of the characteristic signal within the first preset time period.
Optionally, the step of determining whether the second rationality fault exists for the piston cooling assembly comprises:
calculating a second statistical characteristic value of the characteristic signal within the second preset time length;
if the second statistical characteristic value exceeds a second threshold range, judging that the second rationality fault does not exist; otherwise, determining that the second rationality fault exists.
Optionally, the step of calculating the second statistical characteristic value includes calculating an average value of the characteristic signals within the second preset time period.
In order to solve the above technical problems, according to a second aspect of the present invention, there is provided a piston cooling system, characterized in that the piston cooling system comprises a piston cooling assembly, a characteristic signal transmission unit, and a controller,
the piston cooling assembly comprises an oil pump, a main oil duct, an oil control valve, an auxiliary oil duct and a piston cooling nozzle which are connected in sequence; when the engine oil control valve is opened, engine oil sequentially passes through the engine oil pump, the main oil duct, the engine oil control valve, the auxiliary oil duct and the piston cooling nozzle and is ejected towards a piston; when the oil control valve is closed, the oil is confined in the oil pump and the main oil gallery;
The characteristic signal transmission unit is used for acquiring a characteristic signal of the piston cooling assembly and sending the characteristic signal to the controller;
the controller is used for judging whether the piston cooling assembly has the first rationality fault according to the characteristic signal within a first preset time length after the engine oil control valve is opened; and the characteristic signal within a second preset time after the engine oil control valve is closed is used for judging whether the piston cooling assembly has the second rationality fault or not.
Optionally, the characteristic signal is an oil pressure signal, and the characteristic signal transmission unit is an oil pressure sensor arranged in the main oil gallery or in the oil pump; alternatively, the first and second electrodes may be,
the oil pump is a continuously variable oil pump, the characteristic signal is a control signal of the oil pump, and the characteristic signal transmission unit is used for acquiring the control signal of the oil pump and sending the control signal to the controller.
In order to solve the above technical problem, according to a third aspect of the present invention, there is provided a vehicle characterized by including the above piston cooling system.
Compared with the prior art, the fault diagnosis method, the piston cooling system and the vehicle provided by the invention comprise the following steps: judging whether the piston cooling assembly has the first rationality fault according to a characteristic signal within a first preset time after the engine oil control valve is opened; and judging whether the piston cooling assembly has the second rationality fault according to the characteristic signal within a second preset time after the engine oil control valve is closed. Whether the piston cooling assembly has faults or not is directly judged by analyzing the signal change of the characteristic signals after the engine oil control valve is opened and closed, the number of signal sources required for judging the faults is reduced, and the problems that a pressure switch is required to be additionally arranged, the cost is high, the requirement on the installation position of the pressure switch is high and the pressure switch needs additional diagnosis due to the pressure switch in a fault diagnosis method in the prior art are solved.
Drawings
It will be appreciated by those skilled in the art that the drawings are provided for a better understanding of the invention and do not constitute any limitation to the scope of the invention. Wherein:
FIG. 1 is a schematic illustration of a piston cooling nozzle assembly;
FIG. 2 is a logic diagram of a fault rationality diagnostic method;
FIG. 3 is a flow chart of a fault diagnosis method according to an embodiment of the invention;
FIG. 4 is a waveform diagram of signals associated with a piston cooling assembly in accordance with an embodiment of the present invention;
FIG. 5 is a logic diagram of a fault diagnosis method of an embodiment of the present invention;
FIG. 6 is a schematic diagram of a piston cooling system according to an embodiment of the present invention.
In the drawings:
10-oil pump; 20-a main oil gallery; 30-an oil control valve; 40-auxiliary oil ducts; 50-piston cooling nozzle; 60-characteristic signal transmission unit.
Detailed Description
To further clarify the objects, advantages and features of the present invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It is to be noted that the drawings are in greatly simplified form and are not to scale, but are merely intended to facilitate and clarify the explanation of the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.
As used in this application, the singular forms "a", "an" and "the" include plural referents, the term "or" is generally employed in a sense including "and/or," the terms "a" and "an" are generally employed in a sense including "at least one," the terms "at least two" are generally employed in a sense including "two or more," and the terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, features defined as "first", "second" and "third" may explicitly or implicitly include one or at least two of the features, "one end" and "the other end" and "proximal end" and "distal end" generally refer to the corresponding two parts, which include not only the end points, but also the terms "mounted", "connected" and "connected" should be understood broadly, e.g., as a fixed connection, as a detachable connection, or as an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. Furthermore, as used in the present invention, the disposition of an element with another element generally only means that there is a connection, coupling, fit or driving relationship between the two elements, and the connection, coupling, fit or driving relationship between the two elements may be direct or indirect through intermediate elements, and cannot be understood as indicating or implying any spatial positional relationship between the two elements, i.e., an element may be in any orientation inside, outside, above, below or to one side of another element, unless the content clearly indicates otherwise. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
The invention provides a fault diagnosis method, a piston cooling system and a vehicle, and aims to solve the problems that in the prior art, a pressure switch needs to be additionally arranged, the cost is high due to the pressure switch, the requirement on the installation position of the pressure switch is high, and the pressure switch needs to be additionally diagnosed.
The following description refers to the accompanying drawings.
Referring to fig. 3 to fig. 6, fig. 3 is a schematic flow chart illustrating a fault diagnosis method according to an embodiment of the invention; FIG. 4 is a waveform diagram of signals associated with a piston cooling assembly in accordance with an embodiment of the present invention; FIG. 5 is a logic diagram of a fault diagnosis method of an embodiment of the present invention; FIG. 6 is a schematic diagram of a piston cooling system according to an embodiment of the present invention.
As shown in fig. 3, the present embodiment provides a fault diagnosis method, which includes the following steps:
s10, acquiring a characteristic signal within a first preset time after the engine oil control valve 30 is opened;
s20, calculating a first statistical characteristic value of the characteristic signal within the first preset time length;
s30, if the first statistical characteristic value exceeds a first threshold value range, judging that a first rationality fault does not exist; otherwise, judging that the first rationality fault exists;
S40 obtains a characteristic signal within a second preset time period after the oil control valve 30 is opened;
s50, calculating a second statistical characteristic value of the characteristic signal within the second preset time length;
s60, if the second statistical characteristic value exceeds a second threshold range, judging that a second rationality fault does not exist; otherwise, determining that the second rationality fault exists.
In the present embodiment, the characteristic signal is an oil pressure signal in the main oil gallery 20. Since the main gallery 20 and the oil pump 10 are always in communication and the oil pressures of the two are equal or equal within a project scope, in other embodiments, the characteristic signal may be an oil pressure signal in the oil pump 10. Further, some of the oil pumps 10 are provided with an oil pressure sensor, such as a continuously variable oil pump. The oil pressure signal in the continuously variable oil pump can be obtained by back-stepping according to the control signal of the continuously variable oil pump, that is, the control signal of the continuously variable oil pump contains enough information related to the oil pressure. Therefore, in other embodiments, the characteristic signal may be a control signal for a continuously variable oil pump.
It is to be understood that the first plausibility fault is a fault of the type "this opening is not (fully) open" mentioned in the background, whereas the second plausibility fault is a fault of the type "this closing is not (fully) closed" mentioned in the background. The first statistical feature value is a value obtained by performing feature extraction by regarding the feature signal in the first preset duration as a statistical object, reflecting the value of the overall feature of the feature signal in the first preset duration, such as a maximum value, a minimum value, a mean value, a median, a variance, a standard deviation, and the like, and performing simple operational transformation (for example, one or a combination of at least two of three operations of adding a fixed value, subtracting a fixed value, and multiplying a coefficient) based on the above-mentioned values. The second statistical characteristic value can be understood in a similar way. Exceeding the first threshold range is understood to mean that, when the first threshold range is less than or equal to a first preset value, a value greater than the first preset value is considered to be exceeding the first threshold range; when the first threshold range is smaller than a first preset value, the condition that the first threshold range is larger than or equal to the first preset value is considered to be beyond the first threshold range; when the first threshold range is larger than or equal to a first preset value, the first threshold range is considered to be exceeded if the first threshold range is smaller than the first preset value; when the first threshold range is larger than a first preset value, the threshold range is considered to be beyond the first threshold range if the threshold range is smaller than or equal to the first preset value. Exceeding said second threshold range can be understood in a similar way.
By the fault diagnosis method, the following beneficial effects can be obtained: only one characteristic signal needs to be measured for fault diagnosis. Therefore, a pressure switch (or a pressure sensor) does not need to be additionally arranged at the auxiliary oil passage 40, and the problems that the pressure switch needs to be additionally arranged, the cost is high due to the pressure switch, the requirement on the installation position of the pressure switch is high, and the pressure switch needs to be additionally diagnosed in the fault diagnosis method in the prior art are solved.
In an exemplary embodiment, the oil pump 10 is a continuously variable oil pump. Referring to fig. 4, in fig. 4, L1 is a waveform diagram of an oil pressure signal of the main oil gallery 20; l2 is a control signal waveform diagram for the continuously variable oil pump; l3 is a waveform diagram of a control signal of the oil control valve 30. It is to be understood that in practical applications, only the signal of L1 or the signal of L2 is measured for cost reasons, but for ease of illustration and understanding, in the present embodiment, both signals are measured simultaneously.
When the control signal (i.e., L3) of the oil control valve 30 changes from True to False, i.e., when the oil control valve 30 is closed, the main gallery oil pressure (i.e., L1) measured by the oil pressure sensor has a positive sudden change and then gradually falls back to the previous oil pressure, and at the same time, the pressure sensor in the oil pump 10 finds the sudden change of the oil pressure, thereby giving a control signal (i.e., L2) with an opposite trend; in contrast, when the control signal (i.e., L3) of the oil control valve 30 changes from False to True, i.e., the oil control valve 30 opens, the main gallery oil pressure (i.e., L1) measured by the oil pressure sensor has a negative spike and gradually increases to the previous oil pressure, and at the same time, the pressure sensor in the oil pump 10 detects the spike in oil pressure and provides an opposite trend control signal (i.e., L2). The fundamental reason for this phenomenon is that when the oil control valve 30 is suddenly closed or opened, it will have a sudden change effect on the oil flow rate of the main oil gallery 20, and thus the oil pressure will suddenly change, while other factors affecting the oil flow rate are continuously changed, and will not have a sudden change effect on the oil pressure. Therefore, by judging whether the sudden change occurs, whether the piston cooling assembly has a fault can be judged. Further, the method of statistically judging whether the mutation occurs is a method with low requirements for the accuracy of the measuring element. It is to be understood that in some embodiments, the fault diagnosis may also be performed by providing a sensor with high accuracy, and by detecting only whether the signal has a sudden change.
In fig. 4, the L1 signal is the same or close after it has stabilized. The specific value of the steady state of the L2 signal at the time the oil control valve 30 opens and closes is different because the duty cycle (i.e., the control signal) of the solenoid valve of the continuously variable oil pump is inversely proportional to the actual required oil pressure (the actual oil part number). Therefore, when the oil control valve 30 is turned on or off (indicating that the piston cooling nozzle 50 is closed, the oil demand of the piston cooling nozzle 50 is no longer required, and the actual required oil pressure is lowered), the duty ratio of the solenoid valve after stabilization is higher than before. The problem of inaccurate diagnosis caused by the above characteristics can be avoided by reasonably setting the first threshold range and the second threshold range.
Preferably, the step of calculating the first statistical characteristic value includes calculating an average value of the characteristic signal within the first preset time period. The step of calculating the second statistical characteristic value includes calculating an average value of the characteristic signal within the second preset time period. Further, the first statistical characteristic value is an average value of the characteristic signal in the first preset time period, and the second statistical characteristic value is an average value of the characteristic signal in the second preset time period.
In one exemplary embodiment, the fault diagnosis method makes the determination according to the logic shown in FIG. 5. The oil pressure measured by the oil pressure sensor of the main oil gallery 20 is P, and the control signal of the oil control valve 30 is O. When the piston cooling assembly is controlled to start working, namely O is changed from False to True, selecting a period of time with the length of a calibrated value t _ open from the change of O, if the mean value of P in the period of time t _ open is less than the calibrated value P _ open, judging that no rationality fault exists, otherwise, judging that the rationality fault of 'the opening is not (fully) opened' occurs; when the piston cooling assembly is controlled to stop working, namely O is changed from True to False, a period of time with the length of a calibrated value t _ close from the change of O is selected, if the mean value of P in the period of time t _ close is greater than the calibrated value P _ close, no rationality fault can be judged, otherwise, the rationality fault of 'the close is not (fully) closed' is generated. t _ open corresponds to the first preset duration, t _ close corresponds to the second preset duration, greater than or equal to P _ open corresponds to the first threshold range (at which time, less than P _ open is considered to exceed the first threshold range), and less than or equal to P _ close corresponds to the second threshold range (at which time, less than P _ open is considered to exceed the second threshold range); in this embodiment, the first statistical characteristic value is an average value of the characteristic signal in the first preset time period, and the second statistical characteristic value is an average value of the characteristic signal in the second preset time period.
Referring to fig. 6, the present embodiment further provides a piston cooling system, which is characterized in that the piston cooling system includes a piston cooling assembly, a characteristic signal transmission unit 60 and a controller (not shown),
the piston cooling assembly comprises an oil pump 10, a main oil gallery 20, an oil control valve 30, an auxiliary oil gallery 40 and a piston cooling nozzle 50 which are connected in sequence; when the oil control valve 30 is opened, the oil is ejected toward the piston through the oil pump 10, the main oil gallery 20, the oil control valve 30, the auxiliary oil gallery 40, and the piston cooling nozzle 50 in this order; when the oil control valve 30 is closed, the oil is restricted in the oil pump 10 and the main gallery 20;
the characteristic signal transmission unit 60 is configured to acquire a characteristic signal of the piston cooling assembly and send the characteristic signal to the controller;
the controller is used for judging whether the piston cooling assembly has the first rationality fault according to the characteristic signal within a first preset time length after the engine oil control valve is opened; and the characteristic signal within a second preset time after the engine oil control valve is closed is used for judging whether the piston cooling assembly has the second rationality fault or not.
In the present embodiment, the characteristic signal is an oil pressure signal, and the characteristic signal transmission unit 60 is an oil pressure sensor disposed in the main oil gallery 20.
In other embodiments, the following scheme may also be adopted: the characteristic signal is an oil pressure signal, and the characteristic signal transmission unit 60 is an oil pressure sensor arranged in the oil pump 10; or, the oil pump 10 is a continuously variable oil pump, the characteristic signal is a control signal of the oil pump 10, and the characteristic signal transmission unit is configured to acquire the control signal of the oil pump 10 and send the control signal to the controller. The advantage of using a control signal as the characteristic signal is that the piston cooling package is less modified.
In order to solve the above technical problem, according to a third aspect of the present invention, there is provided a vehicle characterized in that the vehicle includes the above piston cooling system. The arrangement of the parts of the piston cooling system in the vehicle, and the implementation of other modules of the vehicle, can be set by those skilled in the art according to actual needs and the prior art, and will not be described in detail herein.
In the piston cooling system and the vehicle, the controller can implement the fault diagnosis method, and therefore, the piston cooling system and the vehicle also have the advantage that fault diagnosis can be performed by only measuring one characteristic signal.
In summary, in the fault diagnosis method, the piston cooling system and the vehicle provided in the embodiment, the fault diagnosis method includes the following steps: judging whether the piston cooling assembly has the first rationality fault according to a characteristic signal within a first preset time after the engine oil control valve 30 is opened; and judging whether the piston cooling assembly has the second rationality fault according to the characteristic signal within a second preset time after the engine oil control valve 30 is closed. Whether the piston cooling assembly has a fault or not is directly judged by analyzing the signal change of the characteristic signal after the engine oil control valve 30 is opened and closed, the number of signal sources required for judging the fault is reduced, and the problems that a pressure switch is required to be additionally arranged, the cost is high, the requirement on the installation position of the pressure switch is high and the pressure switch needs to be additionally diagnosed in a fault diagnosis method in the prior art are solved.
The above description is only for describing the preferred embodiment of the present invention, and it is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art according to the above disclosure are within the protection scope of the present invention.
Claims (7)
1. A fault diagnosis method is characterized by being applied to a piston cooling assembly, wherein the piston cooling assembly comprises an oil pump, a main oil duct, an oil control valve, an auxiliary oil duct and a piston cooling nozzle which are sequentially connected; when the engine oil control valve is opened, engine oil sequentially passes through the engine oil pump, the main oil duct, the engine oil control valve, the auxiliary oil duct and the piston cooling nozzle and is ejected towards a piston; when the oil control valve is closed, the oil is confined in the oil pump and the main oil gallery; the fault diagnosis method comprises the following steps:
judging whether a first rationality fault exists in the piston cooling assembly according to the characteristic signal within a first preset time after the engine oil control valve is opened;
judging whether a second rationality fault exists in the piston cooling assembly according to the characteristic signal within a second preset time length after the engine oil control valve is closed;
the characteristic signal is an oil pressure signal in the main oil gallery or an oil pressure signal in the oil pump, or the oil pump is a continuously variable oil pump, and the characteristic signal is a control signal of the oil pump.
2. The fault diagnostic method according to claim 1, characterized in that the step of determining whether the first rationality fault exists in the piston cooling assembly includes:
Calculating a first statistical characteristic value of the characteristic signal within the first preset time length;
if the first statistical characteristic value exceeds a first threshold range, judging that the first rationality fault does not exist; otherwise, judging that the first rationality fault exists.
3. The fault diagnosis method according to claim 2, wherein the step of calculating the first statistical characteristic value includes calculating an average value of the characteristic signal over the first preset time period.
4. The fault diagnostic method according to claim 1, characterized in that the step of determining whether the second rationality fault exists in the piston cooling assembly includes:
calculating a second statistical characteristic value of the characteristic signal within the second preset time length;
if the second statistical characteristic value exceeds a second threshold range, judging that the second rationality fault does not exist; otherwise, determining that the second rationality fault exists.
5. The fault diagnosis method according to claim 4, characterized in that the step of calculating the second statistical characteristic value comprises calculating an average value of the characteristic signal over the second preset time period.
6. A piston cooling system, comprising a piston cooling assembly, a signature signal transmission unit, and a controller,
the piston cooling assembly comprises an oil pump, a main oil duct, an oil control valve, an auxiliary oil duct and a piston cooling nozzle which are connected in sequence; when the engine oil control valve is opened, engine oil sequentially passes through the engine oil pump, the main oil duct, the engine oil control valve, the auxiliary oil duct and the piston cooling nozzle and is ejected towards a piston; when the oil control valve is closed, the oil is confined in the oil pump and the main oil gallery;
the characteristic signal transmission unit is used for acquiring a characteristic signal of the piston cooling assembly and sending the characteristic signal to the controller;
the controller is used for judging whether a first rationality fault exists in the piston cooling assembly according to the characteristic signal within a first preset time length after the engine oil control valve is opened; and the characteristic signal within a second preset time length after the engine oil control valve is closed is used for judging whether a second rationality fault exists in the piston cooling assembly or not;
the characteristic signal is an oil pressure signal, and the characteristic signal transmission unit is an oil pressure sensor arranged in the main oil gallery or the oil pump; alternatively, the first and second electrodes may be,
The oil pump is a continuously variable oil pump, the characteristic signal is a control signal of the oil pump, and the characteristic signal transmission unit is used for acquiring the control signal of the oil pump and sending the control signal to the controller.
7. A vehicle, characterized in that the vehicle comprises a piston cooling system according to claim 6.
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