CN114441118A - EGR cooler detection system and detection method thereof - Google Patents
EGR cooler detection system and detection method thereof Download PDFInfo
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- CN114441118A CN114441118A CN202111665032.XA CN202111665032A CN114441118A CN 114441118 A CN114441118 A CN 114441118A CN 202111665032 A CN202111665032 A CN 202111665032A CN 114441118 A CN114441118 A CN 114441118A
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- 238000001514 detection method Methods 0.000 title claims abstract description 39
- 239000002826 coolant Substances 0.000 claims abstract description 16
- 239000000110 cooling liquid Substances 0.000 claims abstract description 12
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000005856 abnormality Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 14
- 239000007788 liquid Substances 0.000 description 8
- 230000002159 abnormal effect Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000012809 cooling fluid Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
Abstract
The invention belongs to the technical field of EGR coolers, and particularly relates to an EGR cooler detection system and an EGR cooler detection method. The EGR cooler detection method comprises the steps of obtaining the intake pressure of an EGR cooler; determining that the EGR cooler is leaking based on the intake pressure being greater than a first pressure threshold; the first pressure threshold is a value of an intake pressure at which the coolant leaked from the EGR cooler occupies half the volume of the EGR cooler. According to the EGR cooler detection method, firstly, the intake pressure of the EGR cooler is obtained, the obtained intake pressure is compared with the first pressure threshold value, the intake pressure abnormality of the intake end of the EGR cooler is explained according to the fact that the intake pressure is larger than the first pressure threshold value, and when the cooling liquid in the EGR cooler leaks, the intake resistance in the cooler is increased, the intake pressure of the EGR cooler is changed, and therefore the EGR cooler is judged to leak.
Description
Technical Field
The invention belongs to the technical field of EGR coolers, and particularly relates to an EGR cooler detection system and an EGR cooler detection method.
Background
EGR (Exhaust Gas Re-circulation) is used for returning part of Exhaust Gas discharged by an engine to an air inlet pipe, mixing the Exhaust Gas with fresh air and then sending the mixture into an engine cylinder. The problem of internal leakage of an EGR cooler can occur in the existing EGR, so that refrigerating fluid enters an EGR pipeline, but the leakage of the EGR cooling fluid is difficult to find in the processes of air intake and air exhaust, the problem that the cooling fluid enters the cylinder to cause the damage of a connecting rod or a piston head and the like is further caused, and the engine is difficult to normally run.
Disclosure of Invention
The invention aims to at least solve the problem that the existing EGR leakage influences the normal operation of an engine. The purpose is realized by the following technical scheme:
the invention provides a method for detecting an EGR cooler on one hand, which comprises the following steps:
acquiring the air inlet pressure of an EGR cooler;
determining that the EGR cooler is leaking based on the intake pressure being greater than a first pressure threshold;
the first pressure threshold is a value of an intake pressure at which the coolant leaked from the EGR cooler occupies half the volume of the EGR cooler.
According to the EGR cooler detection method, firstly, the intake pressure of the EGR cooler is obtained, the obtained intake pressure is compared with the first pressure threshold value, the intake pressure of the intake end of the EGR cooler is described to be abnormal according to the fact that the intake pressure is larger than the first pressure threshold value, and when cooling liquid in the EGR cooler leaks, the intake resistance in the cooler is increased, the intake pressure of the EGR cooler is changed, and therefore the EGR cooler is judged to leak. The method for detecting the EGR cooler can timely acquire the leakage information of the EGR cooler so as to maintain and inspect the EGR cooler, avoid the problems of connecting rod damage or piston head damage and the like caused by cooling into a cylinder, and ensure the normal operation of an engine.
In addition, the EGR cooler detection method according to the embodiment of the present invention may further have the following technical features:
in some embodiments of the present invention, before the step of determining that the EGR cooler is leaking based on the intake pressure being greater than the first pressure threshold, the method further comprises:
acquiring the inlet air temperature of an EGR cooler;
acquiring the air intake flow of an EGR cooler;
querying the first pressure threshold of the EGR cooler based on the intake air temperature and the intake air flow rate of the EGR cooler.
In some embodiments of the present invention, the step of querying the first pressure threshold of the EGR cooler based on the intake air temperature and the intake air flow rate of the EGR cooler further comprises:
querying a second pressure threshold of the EGR cooler based on the intake air temperature and the intake air flow rate of the EGR cooler.
In some embodiments of the present invention, after the step of querying the first pressure threshold of the EGR cooler based on the intake air temperature and the intake air flow rate of the EGR cooler, the method further comprises:
and controlling an early warning system to carry out early warning according to the condition that the intake pressure is less than or equal to the first pressure threshold and greater than a second pressure threshold.
In some embodiments of the present invention, after the step of querying the first pressure threshold of the EGR cooler based on the intake air temperature and the intake air flow rate of the EGR cooler, the method further comprises:
and controlling the engine to normally run according to the condition that the intake pressure is less than or equal to the second pressure threshold value.
In some embodiments of the present invention, the step of obtaining the intake pressure of the EGR cooler further comprises:
acquiring an engine running state;
and executing the next step according to the stable running state of the engine.
In some embodiments of the present invention, the obtaining the engine operating state specifically includes:
acquiring the rotating speed of an engine;
engine torque is obtained.
In some embodiments of the present invention, the stabilizing according to the engine operating state specifically includes:
according to the engine speed fluctuation range, the fluctuation range is less than or equal to 1%, and the engine torque fluctuation range is less than or equal to 1%.
In some embodiments of the present invention, the,
after the step of obtaining the intake pressure of the EGR cooler, the method further includes:
and limiting the rotating speed and the torque of the engine according to the condition that the intake pressure is greater than a first pressure threshold value, and controlling an early warning unit to give an early warning.
In another aspect, the present invention provides an EGR cooler detection system, which is configured to implement the EGR cooler detection method according to any one of the above embodiments, and the EGR cooler detection system includes:
an acquisition unit for acquiring an intake pressure of an EGR cooler;
and the judging unit is used for judging the leakage of the EGR cooler according to the fact that the intake pressure is greater than a first pressure threshold value, and the first pressure threshold value is an intake pressure value when the cooling liquid leaked by the EGR cooler occupies half of the volume of the EGR cooler.
According to the EGR cooler detection system of the embodiment of the invention, firstly, the intake pressure of the EGR cooler is obtained through the obtaining unit, the obtained intake pressure is compared with the first pressure threshold value through the judging unit, the intake pressure at the intake end of the EGR cooler is abnormal according to the fact that the intake pressure is larger than the first pressure threshold value, and when the cooling liquid in the EGR cooler leaks, the intake resistance in the cooler is increased, the intake pressure of the EGR cooler is changed, and therefore the EGR cooler is judged to leak. When EGR leakage is judged, the rotation speed and the torque of the engine are limited so as to protect the engine.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like elements throughout. In the drawings:
FIG. 1 is a schematic flow diagram of an EGR cooler detection method according to an embodiment of the present invention;
FIG. 2 is a logic flow diagram illustrating a method for EGR cooler detection in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of an EGR cooler pre-calibrated to a first pressure threshold (flow direction indicated by solid black arrowed lines);
FIG. 4 is a schematic diagram of the EGR cooler pre-calibrated to a second pressure threshold (the black solid arrowed lines indicate airflow direction);
the reference symbols in the drawings denote the following:
100: EGR cooler, 10: EGR cooler body, 101: intake pipe, 102: outlet duct, 103: liquid inlet pipe, 104: liquid outlet pipe, 105: pressure sensor, 106: the level of the cooling liquid;
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof.
Although the terms first, second, third, etc. may be used herein to describe various elements, structures, regions, layers and/or structural sections, these elements, structures, regions, layers and/or structural sections should not be limited by these terms. These terms may be only used to distinguish one element, structure, region, layer or section of structure from a second region, layer or section of structure. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, structure, region, layer or section discussed below could be termed a second element, structure, region, or section without departing from the teachings of the example embodiments.
For convenience in description, the relationship of one element or feature to a second element or feature as illustrated in the figures may be described herein using spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "over", and the like. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1 and fig. 2, a first aspect of the present invention provides an EGR cooler detection method, including:
s10: acquiring the air inlet pressure of an EGR cooler;
s20: determining that the EGR cooler is leaking based on the intake pressure being greater than a first pressure threshold;
the first pressure threshold is a value of an intake pressure at which the coolant leaked from the EGR cooler occupies half the volume of the EGR cooler.
According to the EGR cooler detection method, firstly, the intake pressure of the EGR cooler is obtained, the obtained intake pressure is compared with the first pressure threshold value, the intake pressure of the intake end of the EGR cooler is described to be abnormal according to the fact that the intake pressure is larger than the first pressure threshold value, and when cooling liquid in the EGR cooler leaks, the intake resistance in the cooler is increased, the intake pressure of the EGR cooler is changed, and therefore the EGR cooler is judged to leak. The method for detecting the EGR cooler can timely acquire the leakage information of the EGR cooler so as to maintain and inspect the EGR cooler, avoid the problems of connecting rod damage or piston head damage and the like caused by cooling into a cylinder, and ensure the normal operation of an engine.
In some embodiments of the present invention, before the step of S20, the method further includes:
s11: acquiring the inlet air temperature of an EGR cooler;
s12: acquiring the air intake flow of an EGR cooler;
s13: querying the first pressure threshold of the EGR cooler based on the intake air temperature and the intake air flow rate of the EGR cooler.
The calibrated first pressure threshold is queried by the acquired intake air temperature and intake air flow of the EGR cooler. The calibration process of the first pressure threshold value comprises the following steps: when the coolant inside the EGR cooler body 10 leaks to a certain position inside the cooler (as shown in fig. 3), the first pressure threshold values at different intake air temperatures and different intake air flow rates are recorded (as shown in table 1). A certain position of cooler inside can be the inside and intake pipe 101 intercommunication of cooler, perhaps the position of cooling inside and outlet duct 102 intercommunication, when the coolant liquid spills over to intake pipe 101 or outlet duct 102, gaseous entering cooler is influenced to the coolant liquid, also can influence the cooling of gaseous discharge simultaneously, still can cause the coolant liquid to get into inside the cylinder along with gas. In this embodiment, the inlet pipe 101 and the outlet pipe 102 are both located at a position of half of the volume of the cooler, and therefore, in this embodiment, when the cooler leaks to a position of half of the volume of the cooler, the first pressure threshold is calibrated when the coolant liquid level line 106 reaches the inlet pipe 101 or the outlet pipe 102.
TABLE 1 calibration of first pressure threshold (Kpa) at different inlet flow rates Y (kg/h) and at different inlet temperatures X (deg.C)
The liquid inlet 103 at the top and the liquid outlet 104 at the bottom of the EGR cooler body 10 are only used for conveying cooling liquid without influence on the intake pressure, and the pressure sensor 105 arranged on the intake pipe 101 is used for detecting the intake pressure.
In some embodiments of the present invention, the step of obtaining the intake pressure of the EGR cooler further comprises: and limiting the rotating speed and the torque of the engine according to the condition that the intake pressure is greater than a first pressure threshold value, and controlling an early warning unit to give an early warning.
And limiting the rotation speed and the torque of the engine to protect the engine according to the condition that the intake pressure is greater than the first pressure threshold value, namely when the EGR leaks. In addition, the early warning unit gives an early warning to remind a person skilled in the art to check and repair the EGR cooler.
In some embodiments of the present invention, said querying the first pressure threshold of the EGR cooler based on the intake air temperature and the intake air flow rate of the EGR cooler further comprises:
s14: querying a second pressure threshold of the EGR cooler based on the intake air temperature and the intake air flow rate of the EGR cooler;
the second pressure threshold is an intake pressure value when the leaked cooling liquid of the EGR cooler covers the bottom surface of the inner cavity of the EGR cooler, and the second pressure threshold can also be a normal intake pressure value when the EGR cooler does not leak.
The calibrated second pressure threshold is queried by the acquired intake air temperature and intake air flow of the EGR cooler. The calibration process of the first pressure threshold value comprises the following steps: when the coolant inside the EGR cooler body 10 covers the bottom surface inside the EGR cooler body 10 (as shown in fig. 4), the second pressure threshold at different intake air temperatures and different intake air flow rates are recorded (as shown in table 2). The second pressure threshold is recorded when the coolant of the EGR cooler body 10 covers the bottom surface of the EGR cooler cavity, that is, when the coolant level line 106 is a little higher than the bottom surface of the EGR cooler body 10, that is, when the RGE cooler is just leaking, and the second pressure threshold may be recorded when the level of the coolant leaking from the RGE cooler is at another position.
TABLE 2 calibration values (Kpa) of the second pressure threshold at different inlet flow rates Y (kg/h) and at different inlet temperatures X (deg.C)
In some embodiments of the present invention, after querying the first pressure threshold of the EGR cooler based on the intake air temperature and the intake air flow rate of the EGR cooler, the method further comprises:
s21: and controlling an early warning system to carry out early warning according to the condition that the intake pressure is less than or equal to the first pressure threshold and greater than a second pressure threshold.
S22: and controlling the engine to normally run according to the condition that the intake pressure is less than or equal to the second pressure threshold value.
Comparing the intake pressure with a first pressure threshold and a second pressure threshold, if the intake pressure is smaller than the second pressure threshold, indicating that the EGR cooler does not leak or the volume of the cooling liquid leaking from the EGR cooler is smaller, and the normal use of the EGR cooler is not influenced, and controlling the normal operation of the engine; if the intake pressure is greater than the second pressure threshold and less than or equal to the first pressure threshold, it is indicated that the EGR cooler leaks, but the leaked coolant does not enter the intake pipe 101 or the outlet pipe 102, and the early warning system is controlled to perform fault early warning at this time.
In consideration of possible errors of the second pressure threshold value, the intake pressure may be compared with 110% of the second pressure threshold value, and when the intake pressure is less than or equal to 110% of the second pressure threshold value, it is determined that the normal use of the EGR cooler is not affected by the fact that the EGR cooler is not leaked or the volume of the coolant leaked from the EGR cooler is small; if the intake pressure is greater than 110% of the second pressure threshold value and is less than or equal to the first pressure threshold value, it is determined that the EGR cooler is leaking, but the leaked coolant does not enter the intake pipe 101 or the outlet pipe 102.
In the embodiment, the acquired intake temperature, intake flow and intake pressure are average values within a period of time, so that the reliability of parameters is ensured, and the accuracy of the judgment result is ensured.
In some embodiments of the present invention, before obtaining the intake pressure of the EGR cooler, the method further includes:
acquiring an engine running state;
and executing the next step according to the stable running state of the engine.
When the running state of the engine is stable, the running data of the EGR cooler is normal, and the detection result is accurate. If the operating state of the engine is unstable, the operating data of the EGR cooler is unstable, and the detection of the EGR cooler is stopped.
In some embodiments of the present invention, the obtaining the engine operating state specifically includes:
acquiring the rotating speed of an engine;
engine torque is obtained.
And judging whether the engine is in a normal rotating speed state by the rotating speed of the engine being more than or equal to 500rpm, acquiring the torque of the engine again at the moment, and determining whether the running state of the engine is normal or not by the rotating speed and the torque.
In some embodiments of the present invention, the stabilizing according to the engine operating state specifically includes:
according to the engine speed fluctuation range, the fluctuation range is less than or equal to 1%, and the engine torque fluctuation range is less than or equal to 1%.
When the fluctuation of the rotation speed of the engine is larger than 1%, or the fluctuation of the torque of the engine is larger than 1%, the operation state of the engine is unstable. In order to ensure that the test result is more reliable, the fluctuation range of the rotating speed of the engine is set to be less than or equal to 1%, the fluctuation range of the torque of the engine is set to be less than or equal to 1%, and when both conditions are met, the running state of the engine is judged to be stable. The smaller the fluctuation value of the engine speed and the fluctuation value of the torque are, the more stable the engine is, and therefore, the more accurate the measured data of the intake temperature, the intake flow rate, the intake pressure and the like of the EGR cooler are.
Specifically, the duration of the engine torque fluctuation range of 1% or less is 60S or more depending on the engine speed fluctuation range of 1% or less. When the duration is 60S, the engine is in a steady state, and the longer the duration, the more stable the engine state, and therefore, the duration may also be 120S, 180S, or other time period greater than 60S, and the duration may be selected by a technician depending on the state of the engine. In order to improve the efficiency of the detection of the EGR cooler, the present embodiment preferably takes 60S.
A second aspect of the present invention provides an EGR cooler detection system for implementing the EGR cooler detection method according to any one of the above embodiments, the EGR cooler detection system including:
an acquisition unit for acquiring an intake pressure of an EGR cooler;
and the judging unit is used for judging the leakage of the EGR cooler according to the fact that the intake pressure is greater than a first pressure threshold value, and the first pressure threshold value is an intake pressure value when the cooling liquid leaked by the EGR cooler occupies half of the volume of the EGR cooler.
According to the EGR cooler detection system of the embodiment of the invention, firstly, the intake pressure of the EGR cooler is obtained through the obtaining unit, the obtained intake pressure is compared with the first pressure threshold value through the judging unit, the intake pressure at the intake end of the EGR cooler is abnormal according to the fact that the intake pressure is larger than the first pressure threshold value, and when the cooling liquid in the EGR cooler leaks, the intake resistance in the cooler is increased, the intake pressure of the EGR cooler is changed, and therefore the EGR cooler is judged to leak.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An EGR cooler detection method, characterized by comprising:
acquiring the air inlet pressure of an EGR cooler;
determining that the EGR cooler is leaking based on the intake pressure being greater than a first pressure threshold;
the first pressure threshold is a value of an intake pressure at which the coolant leaked from the EGR cooler occupies half the volume of the EGR cooler.
2. The EGR cooler detection method of claim 1 wherein prior to said step of determining EGR cooler leakage based on said intake pressure being greater than a first pressure threshold, further comprising:
acquiring the inlet air temperature of an EGR cooler;
acquiring the air intake flow of an EGR cooler;
querying the first pressure threshold of the EGR cooler based on the intake air temperature and the intake air flow rate of the EGR cooler.
3. The EGR cooler detection method of claim 2, wherein prior to the step of querying the first pressure threshold of an EGR cooler based on the intake air temperature and the intake air flow rate of the EGR cooler, further comprising:
querying a second pressure threshold of the EGR cooler based on the intake air temperature and the intake air flow rate of the EGR cooler.
4. The EGR cooler detection method of claim 3, wherein after said step of querying the first pressure threshold of an EGR cooler based on the intake air temperature and the intake air flow rate of the EGR cooler, further comprising:
and controlling an early warning system to carry out early warning according to the condition that the air inlet pressure is less than or equal to the first pressure threshold and greater than a second pressure threshold.
5. The EGR cooler detection method of claim 3, wherein after said step of querying the first pressure threshold of an EGR cooler based on the intake air temperature and the intake air flow rate of the EGR cooler, further comprising:
and controlling the engine to normally run according to the condition that the intake pressure is less than or equal to the second pressure threshold value.
6. The EGR cooler detection method according to claim 1, characterized in that before the step of obtaining the intake pressure of the EGR cooler, further comprising:
acquiring an engine running state;
and executing the next step according to the stable running state of the engine.
7. The EGR cooler detection method of claim 6, wherein the obtaining engine operating conditions specifically comprises:
acquiring the rotating speed of an engine;
engine torque is obtained.
8. The EGR cooler detection method according to claim 7, wherein the stabilizing according to the engine operating state specifically comprises:
the fluctuation range of the engine speed is less than or equal to 1% and the fluctuation range of the engine torque is less than or equal to 1%.
9. The EGR cooler detection method according to claim 8, characterized by said step of obtaining an intake pressure of the EGR cooler being followed by further comprising:
and limiting the rotating speed and the torque of the engine according to the condition that the intake pressure is greater than a first pressure threshold value, and controlling an early warning unit to give an early warning.
10. An EGR cooler detection system for implementing the EGR cooler detection method of any one of claims 1 to 9, the EGR cooler detection system comprising:
an acquisition unit for acquiring an intake pressure of an EGR cooler;
and the judging unit is used for judging the leakage of the EGR cooler according to the fact that the intake pressure is greater than a first pressure threshold value, and the first pressure threshold value is an intake pressure value when the cooling liquid leaked by the EGR cooler occupies half of the volume of the EGR cooler.
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| CN114837838A (en) * | 2022-05-25 | 2022-08-02 | 中国第一汽车股份有限公司 | Liquid-cooled intercooler leakage online processing method and device and vehicle |
| CN116766980A (en) * | 2023-08-17 | 2023-09-19 | 太原科技大学 | Liquid cooling heat dissipation charging pile for liquid leakage early warning and early warning method |
| CN116766980B (en) * | 2023-08-17 | 2023-10-27 | 太原科技大学 | Liquid cooling heat dissipation charging pile for liquid leakage early warning and early warning method |
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