CN112664311B - Detection method and detection system for jamming of thermostat and vehicle - Google Patents
Detection method and detection system for jamming of thermostat and vehicle Download PDFInfo
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- CN112664311B CN112664311B CN202011538907.5A CN202011538907A CN112664311B CN 112664311 B CN112664311 B CN 112664311B CN 202011538907 A CN202011538907 A CN 202011538907A CN 112664311 B CN112664311 B CN 112664311B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 128
- 238000001514 detection method Methods 0.000 claims abstract description 48
- 239000012188 paraffin wax Substances 0.000 claims abstract description 17
- 238000002844 melting Methods 0.000 claims abstract description 15
- 230000008018 melting Effects 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims description 28
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 8
- 239000002826 coolant Substances 0.000 description 6
- 238000003745 diagnosis Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000011088 calibration curve Methods 0.000 description 2
- 239000012809 cooling fluid Substances 0.000 description 2
- 239000000110 cooling liquid Substances 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
The invention discloses a detection method, a detection system and a vehicle for the jamming of a thermostat, wherein the detection method comprises the following steps: judging whether the water temperature related parameters of the water outlet of the engine meet the evidence condition of normal operation of the thermostat, if so, judging that the thermostat is not blocked; if not, judging that the thermostat is stuck; wherein, the evidence condition of normal operation of the thermostat comprises: when the water temperature of the water outlet is in the melting temperature range of paraffin in the thermostat, the difference value between the upper limit value of the water temperature and the lower limit value of the water temperature is larger than the calibrated temperature difference threshold value; the time length for the water temperature of the water outlet to reach the upper limit value again from the lower limit value is within the calibration time length range. The detection method can carry out clamping stagnation detection under a looser working condition; and the related water temperature parameters related to the normal operation condition of the thermostat are in the temperature range limited by the performance of thermostat materials, the influence of other heating elements on the water temperature parameters used for detection is small, the detection precision is high, and the misjudgment risk is small.
Description
Technical Field
The invention relates to the technical field of thermostats, in particular to a method and a system for detecting the clamping stagnation of a thermostat and a vehicle.
Background
Engines generate a large amount of heat during operation, resulting in a high engine casing temperature. In order to reduce the temperature of the engine case, the engine case is generally cooled by coolant. However, as the engine operating time increases, the temperature of the coolant gradually increases, and when the temperature of the coolant reaches a certain value, the coolant needs to be cooled by the radiator. When the cooling liquid is radiated by the radiator, the cooling channel through which the cooling liquid flows is called a large circulation channel; when the coolant does not dissipate heat through the radiator, the cooling channel through which the coolant flows at this time is called a small circulation channel. In order to control the cooling fluid to flow through the large circulation passage or the small circulation passage according to the cooling demand of the engine, a thermostat assembly is generally used to control the cooling fluid to flow through the large circulation passage or the small circulation passage. In order to ensure the normal operation of an automobile engine, whether the thermostat has a clamping stagnation fault needs to be detected in the use process of the thermostat.
The existing thermostat diagnosis strategy is that the difference value between the engine water temperature calculated by the model under a specific working condition and the water temperature measured by the engine water temperature sensor is used as the basis for judging the blockage of the thermostat, the working condition requirement is severe, the calculation value of the model is higher, and the risk of misinformation is high.
In conclusion, how to solve the problem of high risk of false alarm in the diagnosis method of the stagnation of the thermostat has become a technical problem to be solved urgently by the technical personnel in the field.
Disclosure of Invention
The invention aims to provide a thermostat clamping stagnation detection method, a thermostat clamping stagnation detection system and a vehicle, and aims to solve the problem that a thermostat clamping stagnation diagnosis method is high in risk of false alarm.
In order to achieve the above object, the present invention provides a method for detecting freezing of a thermostat, the method comprising:
judging whether the water temperature related parameters of the water outlet of the engine meet the evidence condition of normal operation of the thermostat, if so, judging that the thermostat is not blocked; if not, judging that the thermostat is stuck;
the evidence conditions for the normal operation of the thermostat comprise: when the water temperature of the water outlet is within the melting temperature range of paraffin in the thermostat, the difference value between the upper limit value of the water temperature and the lower limit value of the water temperature is larger than the calibration temperature difference threshold value; the time length for the water temperature of the water outlet to reach the upper limit value again from the lower limit value is within the calibration time length range.
Preferably, the upper limit value and the lower limit value are obtained in the following manner: when the water temperature of the water outlet is in the melting temperature range of the paraffin, recording the water temperature of the water outlet once at preset time intervals, comparing the difference value between the last recorded water temperature and the last recorded water temperature in the two adjacent recorded water temperatures with a preset critical threshold value, and if the difference value is changed from being larger than the preset critical threshold value to being smaller than the preset critical threshold value, taking the last recorded water temperature corresponding to the difference value as an upper limit value; if the difference value is larger than the preset critical threshold value from being smaller than the preset critical threshold value, the last recorded water temperature corresponding to the difference value is the lower limit value.
Preferably, the preset critical threshold is zero, and if the difference value between the two adjacent recorded water temperatures changes from a positive value to a negative value, the previous recorded water temperature corresponding to the difference value is an upper limit value; and if the difference value of the water temperatures recorded in two adjacent times is changed from a negative value to a positive value, the previous recorded water temperature corresponding to the difference value is a lower limit value.
Preferably, the preset critical threshold is a calibrated water temperature fluctuation difference value obtained according to the current operation condition of the engine.
Preferably, the current operation condition of the engine is obtained by the following steps: calculating the temperature rise rate according to the time consumed by the initial water temperature of the water outlet and the water temperature of the water outlet when the engine is started to rise from the initial water temperature to the lower limit value of the paraffin melting temperature in the thermostat; and obtaining the current operation condition of the engine corresponding to the temperature rise rate by inquiring a temperature rise rate and engine operation condition matching relation table.
Preferably, the condition for verifying the normal operation of the thermostat further includes: the time consumed by the water temperature of the water outlet after the engine is started to rise from the initial water temperature to the lower limit value of the melting temperature of the paraffin in the thermostat does not exceed the preset time length.
Preferably, after the thermostat is judged to be in the stuck state, the detection method further comprises: and generating fault information of the clamping stagnation of the thermostat, and sending the fault information to the user terminal.
Preferably, the user terminal is a screen display provided in a vehicle.
Compared with the introduction content of the background technology, the detection method for the stagnation of the thermostat comprises the following steps: judging whether the water temperature related parameters of the water outlet of the engine meet the evidence condition of normal operation of the thermostat, if so, judging that the thermostat is not blocked; if not, judging that the thermostat is stuck; wherein, the evidence condition of normal operation of the thermostat comprises: when the water temperature of the water outlet is within the melting temperature range of paraffin in the thermostat, the difference value between the upper limit value of the water temperature and the lower limit value of the water temperature is larger than the calibration temperature difference threshold value; the time length for the water temperature of the water outlet to reach the upper limit value again from the lower limit value is within the calibration time length range. In the actual application process, whether the thermostat is stuck is judged by judging whether the water temperature related parameters at the water outlet of the engine meet the evidence condition of normal operation of the thermostat or not, wherein the evidence condition of normal operation of the thermostat is based on the physical characteristics of paraffin in the thermostat, has no specific requirements on the current operation condition of the engine, and can carry out stagnation detection under a more loose working condition; and the water temperature related parameters of the water outlet of the engine related to the normal operation condition of the thermostat are in a temperature range limited by the performance of the thermostat material, the influence of other heating elements on the water temperature parameters used for detection is small, the detection precision is higher, and the misjudgment risk is smaller.
In addition, the invention also provides a system for detecting the stagnation of the thermostat, which comprises a detector, wherein the detector performs detection according to the method for detecting the stagnation of the thermostat described in any scheme. Since the method for detecting the thermostat sticking has the above technical effects, a detection system for performing detection according to the method for detecting the thermostat sticking should also have corresponding technical effects, which are not described herein again.
In addition, the invention also provides a vehicle which comprises the thermostat clamping stagnation detection system. Since the thermostat clamping stagnation detection system has the technical effects, a vehicle with the thermostat clamping stagnation detection system also has corresponding technical effects, and details are not repeated herein.
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 some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method for detecting a thermostat sticking according to an embodiment of the present invention.
Detailed Description
The core of the invention is to provide a thermostat clamping stagnation detection method, a thermostat clamping stagnation detection system and a vehicle, so as to solve the problem that the thermostat clamping stagnation diagnosis method is high in false alarm risk.
In order to make those skilled in the art better understand the technical solutions provided by the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
As shown in fig. 1, a method for detecting a freezing of a thermostat provided in an embodiment of the present invention includes: judging whether the water temperature related parameters of the water outlet of the engine meet the evidence condition of normal operation of the thermostat, if so, judging that the thermostat is not blocked; if not, judging that the thermostat is stuck; the evidence of the normal operation of the thermostat includes: when the water temperature of the water outlet is in the melting temperature range of paraffin in the thermostat, the difference value between the upper limit value of the water temperature and the lower limit value of the water temperature is larger than the calibrated temperature difference threshold value; the time length for the water temperature of the water outlet to reach the upper limit value again from the lower limit value is within the calibration time length range.
In the actual application process, whether the thermostat is stuck is judged by judging whether the water temperature related parameters at the water outlet of the engine meet the evidence condition of normal operation of the thermostat or not, wherein the evidence condition of normal operation of the thermostat is based on the physical characteristics of paraffin in the thermostat, has no specific requirements on the current operation condition of the engine, and can carry out stagnation detection under a more loose working condition; and the water temperature related parameters of the water outlet of the engine related to the normal operation condition of the thermostat are in a temperature range limited by the performance of the thermostat material, the influence of other heating elements on the water temperature parameters used for detection is small, the detection precision is higher, and the misjudgment risk is smaller.
It should be noted that the calibration temperature threshold and the calibration time length range are reference values obtained through a simulation experiment test in the normal operation mode of the thermostat. The reference value can be matched with different operation conditions of the engine to form a calibration curve matched with the corresponding operation condition, then the temperature threshold value and the calibration time length range are calibrated, and the calibration curves corresponding to the reference value can be respectively inquired in combination with the current operation condition of the engine to obtain the corrected calibration temperature threshold value and the corrected calibration time length range, so that the calibration temperature threshold value and the calibration time length range are closer to the actual condition, and the detection result is more accurate.
It should be noted that in the actual implementation process of the detection method, when the water temperature at the water outlet of the engine is in the melting temperature range of paraffin in the thermostat, an upper limit value of the water temperature and a lower limit value of the water temperature are acquired; and then comparing the difference value of the two with a calibrated temperature difference threshold value. In some specific embodiments, the upper limit value and the lower limit value may be obtained by: when the water temperature of the water outlet is in the melting temperature range of the paraffin, recording the water temperature of the water outlet once at preset time intervals, comparing the difference value between the last recorded water temperature and the last recorded water temperature in the two adjacent recorded water temperatures with a preset critical threshold value, and if the difference value is changed from being larger than the preset critical threshold value to being smaller than the preset critical threshold value, taking the last recorded water temperature corresponding to the difference value as an upper limit value; if the difference value is larger than the preset critical threshold value from being smaller than the preset critical threshold value, the last recorded water temperature corresponding to the difference value is the lower limit value. The inflection point position can be obtained by comparing with the preset critical threshold, it is understood that this manner is only a preferred example of the implementation of the present invention, and in the practical application, other methods commonly used by those skilled in the art may be used to obtain the upper limit value and the lower limit value, which are not specifically limited herein.
It should be noted that the preset critical threshold may be specifically selected to be zero, and if the difference between the two adjacent recorded water temperatures changes from a positive value to a negative value, the previous recorded water temperature corresponding to the difference is an upper limit value; and if the difference value of the water temperatures recorded in two adjacent times is changed from a negative value to a positive value, the previous recorded water temperature corresponding to the difference value is a lower limit value.
In a further embodiment, in order to obtain the upper limit value and the lower limit value more accurately and reduce the influence of water temperature fluctuation, the preset critical threshold value may also be selected as a calibrated water temperature fluctuation difference value obtained under the current operating condition of the engine, and the preset critical threshold value at this time should be a value close to zero.
In some more specific embodiments, the current operating condition of the engine is obtained by: calculating the temperature rise rate according to the time consumed by the initial water temperature of the water outlet and the water temperature of the water outlet when the engine is started to rise from the initial water temperature to the lower limit value of the paraffin melting temperature in the thermostat; and obtaining the current operation condition of the engine corresponding to the temperature rise rate by inquiring a temperature rise rate and engine operation condition matching relation table. The temperature rise rate and the engine operation condition matching relation table can be obtained through simulation experiment tests. It can be understood that the above manner of obtaining the current operating condition of the engine by querying the corresponding condition matching relationship table through the temperature rise rate is merely a preferred example of the embodiment of the present invention, and in the practical application process, other manners commonly used by those skilled in the art may also be used to obtain the current operating condition of the engine, for example, a manner of obtaining the current operating condition of the engine through parameters such as the current speed and load of the engine, and the like, which is not limited herein more specifically.
In some specific embodiments, the aforementioned condition for verifying the normal operation of the thermostat may further include: the time consumed by the water temperature of the water outlet after the engine is started to rise from the initial water temperature to the lower limit value of the melting temperature of the paraffin in the thermostat does not exceed the preset time length. The preset time is reference time obtained through test under normal operation of the thermostat, if the reference time is exceeded, the thermostat is not in normal operation, the thermostat is judged to be in jamming, and the accuracy of detection of the detection method can be improved by adding the verification condition.
In a further embodiment, in the detection method, after the thermostat is determined to be in the stuck state, the detection method further comprises: and generating fault information of the clamping stagnation of the thermostat, and sending the fault information to the user terminal. By generating fault information and sending the fault information to the user terminal, a user can timely know the clamping stagnation state of the thermostat, and then timely take corresponding measures. It should be noted that the user terminal may specifically be a screen display provided in the vehicle, or other user terminals known in the art, such as an alarm in the vehicle, a mobile phone connected to the vehicle control system through the APP, and the like, which is not limited in more detail herein.
In addition, the invention also provides a system for detecting the blockage of the thermostat, which comprises a detector, wherein the detector performs detection according to the method for detecting the blockage of the thermostat, which is described in any scheme. Since the method for detecting the thermostat sticking has the above technical effects, a detection system for performing detection according to the method for detecting the thermostat sticking should also have corresponding technical effects, which are not described herein again.
In addition, the invention also provides a vehicle which comprises the thermostat clamping stagnation detection system. Since the thermostat sticking detection system has the above technical effects, a vehicle having the thermostat sticking detection system should also have corresponding technical effects, which are not described herein again.
The detection method, the detection system and the vehicle for the stagnation of the thermostat provided by the invention are described in detail above. 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.
It is also noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, it is possible to make various improvements and modifications to the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A detection method for the jamming of a thermostat is characterized by comprising the following steps:
judging whether the water temperature related parameters of the water outlet of the engine meet the evidence condition of normal operation of the thermostat, if so, judging that the thermostat is not blocked; if not, judging that the thermostat is stuck;
the evidence conditions for the normal operation of the thermostat comprise: when the water temperature of the water outlet is within the melting temperature range of paraffin in the thermostat, the difference value between the upper limit value of the water temperature of the water outlet and the lower limit value of the water temperature of the water outlet is larger than a calibration temperature difference threshold value; the time length for the water temperature of the water outlet to reach the upper limit value again from the lower limit value is within the calibration time length range.
2. The method of claim 1, wherein the upper limit and the lower limit are obtained by: when the water temperature of the water outlet is in the melting temperature range of the paraffin, recording the water temperature of the water outlet once at preset time intervals, comparing the difference value between the last recorded water temperature and the last recorded water temperature in the two adjacent recorded water temperatures with a preset critical threshold value, and if the difference value is changed from being larger than the preset critical threshold value to being smaller than the preset critical threshold value, taking the last recorded water temperature corresponding to the difference value as an upper limit value; if the difference value is larger than the preset critical threshold value from being smaller than the preset critical threshold value, the last recorded water temperature corresponding to the difference value is the lower limit value.
3. The method as claimed in claim 2, wherein the predetermined threshold is zero, and if the difference between the water temperatures recorded in two consecutive times changes from a positive value to a negative value, the water temperature recorded in the previous time corresponding to the difference is an upper limit value; and if the difference value of the water temperatures recorded in two adjacent times is changed from a negative value to a positive value, the previous recorded water temperature corresponding to the difference value is a lower limit value.
4. The method of claim 2, wherein the predetermined threshold is a calibrated water temperature fluctuation difference value obtained according to the current operating condition of the engine.
5. The method for detecting the seizure of the thermostat of claim 4, wherein the current operating condition of the engine is obtained by: calculating the temperature rise rate according to the time consumed by the initial water temperature of the water outlet and the water temperature of the water outlet when the engine is started to rise from the initial water temperature to the lower limit value of the paraffin melting temperature in the thermostat; and obtaining the current operation condition of the engine corresponding to the temperature rise rate by inquiring a temperature rise rate and engine operation condition matching relation table.
6. The method of claim 1, wherein the evidence of the thermostat's normal operation further comprises: the time consumed by the water temperature of the water outlet after the engine is started to rise from the initial water temperature to the lower limit value of the melting temperature of the paraffin in the thermostat does not exceed the preset time length.
7. The method of detecting binding-stagnation of a thermostat of any of claims 1-6, wherein after determining that the thermostat is in a binding-stagnation state, the method further comprises: and generating fault information of the clamping stagnation of the thermostat, and sending the fault information to the user terminal.
8. The method of claim 7, wherein the user terminal is a screen display disposed in a vehicle.
9. A thermostat binding stagnation detection system comprising a detector, wherein the detector performs detection according to the thermostat binding stagnation detection method of any one of claims 1-8.
10. A vehicle comprising a thermostat binding detection system, wherein the thermostat binding detection system is the thermostat binding detection system of claim 9.
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| CN202011538907.5A CN112664311B (en) | 2020-12-23 | 2020-12-23 | Detection method and detection system for jamming of thermostat and vehicle |
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| CN202011538907.5A CN112664311B (en) | 2020-12-23 | 2020-12-23 | Detection method and detection system for jamming of thermostat and vehicle |
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| JP5206160B2 (en) * | 2008-06-30 | 2013-06-12 | マツダ株式会社 | Thermostat failure detection apparatus and method |
| JP5793296B2 (en) * | 2010-12-17 | 2015-10-14 | 日野自動車株式会社 | Thermostat failure judgment device |
| JP5906981B2 (en) * | 2012-07-23 | 2016-04-20 | 三菱自動車工業株式会社 | Thermostat failure diagnosis apparatus and failure diagnosis method |
| JP6337032B2 (en) * | 2016-02-04 | 2018-06-06 | 株式会社Ｓｕｂａｒｕ | Thermostat failure detection device |
| CN205977391U (en) * | 2016-07-01 | 2017-02-22 | 宝沃汽车（中国）有限公司 | Vehicle temperature saver trouble monitoring device and vehicle |
| US10119455B2 (en) * | 2016-09-13 | 2018-11-06 | Caterpillar Inc. | Method and system for detecting thermostat failure in an engine cooling system |
| CN108507763B (en) * | 2017-02-28 | 2020-04-07 | 联合汽车电子有限公司 | Thermostat fault active diagnosis method and system |
| CN109578129B (en) * | 2018-12-20 | 2020-08-07 | 东风汽车集团有限公司 | An engine cooling water temperature control system and method |
| CN110566339A (en) * | 2019-09-27 | 2019-12-13 | 潍柴动力股份有限公司 | Thermostat clamping stagnation monitoring method and device, controller and vehicle |
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