CN114810325B - TMM module leakage fault diagnosis method and device - Google Patents
TMM module leakage fault diagnosis method and device Download PDFInfo
- Publication number
- CN114810325B CN114810325B CN202110117152.XA CN202110117152A CN114810325B CN 114810325 B CN114810325 B CN 114810325B CN 202110117152 A CN202110117152 A CN 202110117152A CN 114810325 B CN114810325 B CN 114810325B
- Authority
- CN
- China
- Prior art keywords
- temperature
- module
- fan
- tmm
- engine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/14—Indicating devices; Other safety devices
-
- 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
Abstract
The application discloses a TMM module fault diagnosis method and device, wherein the TMM module fault diagnosis method comprises the following steps: judging whether the cooling liquid reaches primary heat balance after the engine is started, whether the TMM module does not start large circulation, whether the vehicle speed is in a preset vehicle speed range and whether the fan has no fault; if the judgment result is yes, when the temperature of the cooling liquid has a peak, the fan is started at the maximum; judging whether the duration time of the fan exceeds a period of time; if yes, controlling to stop rotating the fan; learning an engine coolant temperature curve to calculate the temperature difference between a pair of adjacent wave peaks and wave troughs to obtain a coolant temperature drop value, wherein the temperature drop value is larger than a threshold value, the counting times are accumulated by 1, and judging whether the counting times accumulated value is larger than or equal to an accumulated threshold value; if the judgment result is that the counting times accumulated value is larger than or equal to the accumulated threshold value, diagnosing that the TMM module has leakage faults. The method can ensure accurate diagnosis and lower cost.
Description
Technical Field
The application relates to the technical field of vehicles, in particular to a TMM module leakage fault diagnosis method and device.
Background
TMM (Thermal Management Module) module is intelligent thermal management module, can adjust the open/close flow of each branch in the cooling system in real time according to the actual operating mode of vehicle to reach quick warm-up, maintain the function of the optimum operating temperature of system, realize better fuel economy performance. The TMM module is used as a substitute for the mechanical thermostat, and the requirement of 'whether the thermostat works normally or not' in the state six regulations is also required to be met. Besides detecting the working states of the TMM circuit, the sensor and the ball valve, the leakage state (namely leakage fault) of the TMM module is required to be monitored, and if the temperature of the cooling system of the engine is abnormal due to the leakage fault of the TMM module, the system can accurately identify the leakage fault state.
At present, a relatively direct method for judging whether a TMM module has leakage faults is to calculate the temperature of engine model cooling liquid, and then check and judge the temperature of the model and the actual cooling liquid. However, the temperature of engine coolant is affected by many factors such as intake air amount, fuel injection amount, EGR, exhaust gas pressurization, warm air, vehicle speed, etc., so that it is more challenging to obtain a more accurate model water temperature. The leakage fault diagnosis of the TMM module is realized by using a double water temperature diagnosis method, wherein the diagnosis method is to install a water temperature sensor at the water outlet of the radiator, and before the TMM module opens the water path of the radiator, whether the TMM module has leakage fault is judged by comparing the difference between the water temperature at the water outlet of the radiator and the water temperature of the engine. The dual water temperature diagnosis method needs to add an extra water temperature sensor in terms of hardware, and needs to select points and punch holes on the radiator, so that the hardware cost is high.
Therefore, it is necessary to establish an accurate and low-cost method and device for diagnosing leakage faults of the TMM module, so as to conveniently diagnose whether the TMM module has leakage faults.
The foregoing description is provided for general background information and does not necessarily constitute prior art.
Disclosure of Invention
The invention aims to provide a TMM module leakage fault diagnosis method and device, which can ensure accurate diagnosis and have lower cost.
In order to achieve the above purpose, the technical scheme of the application is realized as follows:
in a first aspect, an embodiment of the present application provides a method for diagnosing a TMM module fault, including: judging whether the cooling liquid reaches primary heat balance after the engine is started, whether the TMM module does not start large circulation, whether the vehicle speed is in a preset vehicle speed range and whether the fan has no fault; if the judgment result is yes, when the temperature of the cooling liquid has a peak, the fan is started at the maximum; judging whether the duration time of the fan exceeds a period of time; if yes, controlling to stop rotating the fan; learning an engine coolant temperature curve to calculate the temperature difference between a pair of adjacent wave peaks and wave troughs to obtain a coolant temperature drop value, wherein the temperature drop value is larger than a threshold value, the counting times are accumulated by 1, and judging whether the counting times accumulated value is larger than or equal to an accumulated threshold value; if the judgment result is that the counting times accumulated value is larger than or equal to the accumulated threshold value, diagnosing that the TMM module has leakage faults.
As one embodiment, judging whether the duration of the rotation of the fan exceeds a period of time; if yes, control to stop rotating the fan, still include:
judging whether the continuous rotation time of the fan exceeds a period of time, or whether the water temperature is in a trough state, or whether the large circulation is started, or whether the fan fails, or whether the vehicle speed exceeds a preset vehicle speed range, if so, controlling to stop rotating the fan.
As one embodiment, the determining before the engine is started further includes:
after the engine is successfully started, judging whether the starting temperature of the engine is lower than a preset temperature and whether the ambient temperature is higher than the preset ambient temperature;
if the judgment result is that the engine starting temperature is lower than the preset temperature and the environment temperature is higher than the preset environment temperature, and the TMM module has no faults of sensors and communication, the engine controller judges whether the opening of the effective TMM module can be read;
if the engine controller can read the opening degree of the effective TMM module, judging whether the temperature of the engine coolant is lower than the lowest temperature of the closed-loop control of the TMM module;
and if the temperature is lower than the lowest temperature of the TMM closed-loop control, resetting the timer, and judging the step after the engine is started.
As one embodiment, determining whether the engine coolant temperature is lower than a minimum temperature of TMM module closed loop control further includes:
if the temperature is higher than the lowest temperature of the TMM module closed-loop control, starting a timer, judging whether the timing time of the timer exceeds the threshold time, if the judgment result is that the timing time of the timer exceeds the threshold time, diagnosing that the TMM module has no leakage fault, and if the timing time of the timer does not exceed the threshold time, judging whether the temperature of the engine coolant is lower than the lowest temperature of the TMM module closed-loop control.
As one embodiment, determining whether the count number integrated value is equal to or greater than the integrated threshold value further includes:
and if the judgment result is that the count number accumulated value is smaller than the accumulated threshold value, the step of judging whether the opening of the effective TMM module can be read by the engine controller is performed.
As one of the embodiments, determining whether the engine start temperature is lower than a preset temperature and whether the ambient temperature is higher than the preset ambient temperature further includes:
if the judgment result is that the engine starting temperature is not lower than the preset temperature and the environment temperature is not higher than the preset environment temperature, ending the diagnosis.
As one embodiment, the engine controller determines whether the opening degree of the effective TMM module can be read, and further includes:
if the opening degree of the effective TMM module cannot be read by the engine controller, the diagnosis is ended.
In a second aspect, an embodiment of the present application provides a TMM module fault diagnosis apparatus, including: a judging module before the fan is started, a fan starting module, a fan controlling and closing module, a temperature drop value calculating module and a fault judging module, wherein,
the judging module before the fan is started is used for judging whether the cooling liquid reaches primary heat balance after the engine is started, whether the TMM module does not start large circulation, whether the speed of the vehicle is in a preset speed range and whether the fan has no fault;
the fan starting module is used for starting the fan at the maximum when the temperature of the cooling liquid has a peak if the judgment result of the judgment module before the fan is started is yes;
the control fan closing module is used for judging whether the continuous rotation time of the fan exceeds a period of time, and if so, stopping rotating the fan;
the temperature drop value calculation module is used for learning a temperature curve of the engine cooling liquid so as to calculate the temperature difference between a pair of adjacent wave peaks and wave troughs to obtain a cooling liquid temperature drop value, wherein the temperature drop value is larger than a threshold value, the counting times are accumulated by 1, and whether the counting times accumulated value is larger than or equal to an accumulated threshold value is judged;
and the fault judging module is used for diagnosing the leakage fault of the TMM module if the temperature drop value calculating module judges that the counting frequency accumulated value is larger than or equal to the accumulated threshold value.
The beneficial effects that technical scheme that this application embodiment provided brought are:
according to the TMM module fault diagnosis method and device, whether cooling liquid reaches primary heat balance after an engine is started is judged, whether a TMM module does not start large circulation, whether the vehicle speed is in a preset vehicle speed range and whether a fan has no fault or not; if the judgment result is yes, when the temperature of the cooling liquid has a peak, the fan is started at the maximum; judging whether the duration time of the fan exceeds a period of time; if yes, controlling to stop rotating the fan; learning an engine coolant temperature curve to calculate the temperature difference between a pair of adjacent wave peaks and wave troughs to obtain a coolant temperature drop value, wherein the temperature drop value is larger than a threshold value, the counting times are accumulated by 1, and judging whether the counting times accumulated value is larger than or equal to an accumulated threshold value; if the judgment result is that the accumulated value of the counting times is greater than or equal to the accumulated threshold value, the TMM module is diagnosed as having leakage fault, so that the method does not need to add any complex equipment, and the TMM leakage diagnosis can be completed by analyzing the difference between the leakage state of the TMM module and the cooling waterway in a normal state, and the method for actively controlling the fan is provided; and secondly, a complex model is not required to be constructed to calculate the temperature of the cooling liquid model, so that the cost of manpower and material resources is saved.
Drawings
Fig. 1 is a flow chart of a TMM module fault diagnosis method provided in an embodiment of the present application;
FIG. 2 is a detailed schematic diagram of the fault diagnosis method of the TMM module of FIG. 1;
fig. 3 is a block diagram of a TMM module fault diagnosis apparatus provided in an embodiment of the present application.
Detailed Description
The technical scheme of the application is further elaborated below by referring to the drawings in the specification and the specific embodiments. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Fig. 1 is a schematic flow chart of a TMM module fault diagnosis method according to a first embodiment of the present application. The method for diagnosing the TMM module fault of the embodiment, referring to FIG. 1, can include the following steps:
step S104, judging whether the cooling liquid reaches primary heat balance after the engine is started, whether the TMM module is not started for large circulation, whether the vehicle speed is in a preset vehicle speed range (for example, 30 km/h-100 km/h), and whether the fan has no faults, if yes, performing step S105, and preferably, if no, that is, neither side-by-side conditions are satisfied, performing step S108.
Wherein, this step may further include: the timer is reset.
Step S105, when the peak of the coolant temperature occurs, the fan is turned on at the maximum.
When the temperature of the coolant has an inflection point that decreases, it is determined that the temperature of the coolant has a peak.
Step S106, it is determined whether the duration of rotation of the fan exceeds a period of time, and it is also preferable to determine whether, for example, 2 minutes, or whether a trough occurs in the water temperature, or whether a large cycle is turned on, or whether a failure occurs in the fan, or whether the vehicle speed exceeds a preset vehicle speed range, for example, a range of 30km/h to 100km/h, if yes, step S107 is performed, if no, that is, neither condition is satisfied, and step S105 is performed again.
In step S107, control stops rotating the fan.
Step S108, learning the temperature curve of the engine coolant to calculate the temperature difference between a pair of adjacent wave crest and wave trough values, namely, the temperature drop value of the coolant is larger than the temperature drop threshold value, the count number is accumulated by 1, whether the count number accumulated value is larger than or equal to the accumulated threshold value, for example, 3 is judged, if the count number accumulated value is larger than or equal to 3, step S109 is carried out.
The engine controller may learn an engine coolant temperature profile in order to calculate a temperature difference between a pair of adjacent peak and valley values, i.e., a coolant temperature drop value. The engine controller judges that the temperature drop value of the engine cooling liquid is larger than the temperature drop threshold value, the counter is accumulated by 1, and judges the times that the temperature drop value of the engine cooling liquid is larger than the accumulated threshold value, and the temperature drop threshold value and the accumulated threshold value can be set according to actual needs.
And step S109, diagnosing that the TMM module has leakage faults, and ending the diagnosis.
According to the method, no complex equipment is required to be added, TMM leakage diagnosis can be completed by analyzing the difference between the leakage state of the TMM module and the cooling waterway in the normal state, the method for actively controlling the fan is provided, accurate and rapid diagnosis can be realized by the method, hardware change of an original system is not required, and hardware cost is saved.
In summary, according to the method for diagnosing the fault of the TMM module provided by the embodiment of the present application, by determining whether the coolant reaches the primary heat balance after the engine is started, and whether the TMM module does not start the large cycle, and whether the vehicle speed is within the preset vehicle speed range, and whether the fan has no fault; if the judgment result is yes, when the temperature of the cooling liquid has a peak, the fan is started at the maximum; judging whether the duration time of the fan exceeds a period of time; if yes, controlling to stop rotating the fan; learning an engine coolant temperature curve to calculate the temperature difference between a pair of adjacent wave peaks and wave troughs to obtain a coolant temperature drop value, wherein the temperature drop value is larger than a threshold value, the counting times are accumulated by 1, and judging whether the counting times accumulated value is larger than or equal to an accumulated threshold value; if the judgment result is that the accumulated value of the counting times is greater than or equal to the accumulated threshold value, the TMM module is diagnosed as having leakage fault, so that the method does not need to add any complex equipment, and the TMM leakage diagnosis can be completed by analyzing the difference between the leakage state of the TMM module and the cooling waterway in a normal state, and the method for actively controlling the fan is provided; and secondly, a complex model is not required to be constructed to calculate the temperature of the cooling liquid model, so that the cost of manpower and material resources is saved.
Fig. 2 is a detailed step schematic diagram of the TMM module fault diagnosis method of fig. 1. Similar to the TMM module fault diagnosis method shown in fig. 1, the difference is that the method specifically may further include, before step 104 in fig. 2: steps S101 to S103 may further include steps S110 to S111:
in step S101, after the engine is successfully started, it is determined whether the engine start temperature is lower than a preset temperature (for example, 60 degrees) and the ambient temperature is higher than a preset ambient temperature (for example, -7 degrees), if the engine start temperature is lower than the preset temperature and the ambient temperature is higher than the preset ambient temperature, step S102 is performed, and preferably, if one of the conditions is not satisfied, the diagnosis is ended.
After the engine is started successfully, the engine controller can judge whether the engine starting temperature is lower than a preset temperature (for example, 60 degrees) or not and whether the ambient temperature is higher than a preset ambient temperature (for example, 7 degrees) or not according to the obtained engine starting temperature and the ambient temperature. The engine starting temperature and the environment temperature can be acquired through a temperature sensor.
In step S102, the engine controller determines whether the opening degree of the valid TMM module can be read, if the engine controller can read the opening degree of the valid TMM module, step S103 is performed, and preferably, if the engine controller cannot read the opening degree of the valid TMM module, the diagnosis is ended.
If the TMM module has no sensor fault, communication fault and the like, the engine controller can read the effective opening degree of the TMM module. The engine controller can compare the read opening of the TMM module with the opening corresponding to the preset large circulation opening, and can judge whether the large circulation is actively opened or not by reading the TMM opening. The read opening degree of the TMM module is effective, and is a precondition for carrying out the subsequent TMM module leakage fault diagnosis process. The TMM module is used to control the temperature of the engine coolant. The TMM module is used for controlling the temperature of engine cooling liquid by opening the opening of the ball valve within a certain angle range. For example, if the opening degree of the ball valve is opened by the TMM module is greater than 67 degrees, the large circulation is controlled to be opened, the engine coolant flows through the radiator to rapidly dissipate heat, the heat dissipation is faster, the influence on the coolant temperature is larger when the fan is opened, if the opening degree of the ball valve is smaller than 67 degrees by the TMM module, the large circulation is controlled not to be opened, the heat dissipation is slower, and the influence on the coolant temperature is smaller when the fan is opened.
Step S103, determining whether the temperature of the engine coolant is lower than the lowest temperature of the TMM module closed-loop control, if so, performing step S104, preferably, if it is higher than the lowest temperature of the TMM module closed-loop control, proceeding to step S110.
Step S104, resetting the timer, judging whether the cooling liquid reaches one time of heat balance after the engine is started, judging whether the TMM module does not start large circulation, judging whether the vehicle speed is in a preset vehicle speed range (for example, 30 km/h-100 km/h) and whether the fan has no faults, if so, executing step S105, and preferably, if not, namely, judging that the parallel conditions are not met, executing step S108.
Wherein, resetting the timer is to zero the timer value.
Step S105, when the peak of the coolant temperature occurs, the fan is turned on at the maximum.
When the temperature of the coolant has an inflection point that decreases, it is determined that the temperature of the coolant has a peak.
Step S106, it is determined whether the duration of rotation of the fan exceeds a period of time, and it is also preferable to determine whether, for example, 2 minutes, or whether a trough occurs in the water temperature, or whether a large cycle is turned on, or whether a failure occurs in the fan, or whether the vehicle speed exceeds a preset vehicle speed range, for example, a range of 30km/h to 100km/h, if yes, step S107 is performed, if no, that is, neither condition is satisfied, and step S105 is performed again.
In step S107, control stops rotating the fan.
Step S108, learning the temperature curve of the engine coolant to calculate the temperature difference between the adjacent pair of peak and trough values, namely the coolant temperature drop value, wherein the temperature drop value is larger than the temperature drop threshold value, the count number is accumulated by 1, and whether the count number accumulated value is larger than or equal to the accumulated threshold value, for example, 3 is judged, if the count number accumulated value is larger than or equal to 3 as a judgment result, step S109 is performed, and preferably, if the judgment result is smaller than 3, step S102 is performed in a returning manner.
The engine controller may learn an engine coolant temperature profile in order to calculate a temperature difference between a pair of adjacent peak and valley values, i.e., a coolant temperature drop value. The engine controller judges that the temperature drop value of the engine cooling liquid is larger than the temperature drop threshold value, the counter is accumulated by 1, and judges the times that the temperature drop value of the engine cooling liquid is larger than the accumulated threshold value, and the temperature drop threshold value and the accumulated threshold value can be set according to actual needs.
And step S109, diagnosing that the TMM module has leakage faults, and ending the diagnosis.
Step S110, starting a timer, judging whether the time counted by the timer exceeds the threshold time, if the judgment result is that the time counted by the timer exceeds the threshold time, diagnosing that the TMM module has no leakage fault, and ending the diagnosis, otherwise, if the time counted by the timer does not exceed the threshold time, executing step S103.
In the step, whether the temperature duration of the engine coolant is longer than the accumulated time of the lowest temperature of TMM closed-loop control is judged, and whether leakage faults exist or not is obtained. In the application, if the TMM module has leakage fault, the temperature of the engine cooling liquid is circulated greatly before the TMM module actively opens the radiator, and the engine cooling liquid passes through the radiator and returns to the engine after being cooled by the radiator. Therefore, the temperature of the engine coolant is greatly influenced by the heat dissipation coefficient of the radiator, when the heat dissipation coefficient of the radiator is large, the temperature of the engine coolant rises slowly or even generates larger temperature drop, and when the heat dissipation coefficient of the radiator is small, the temperature of the engine coolant generates smaller temperature drop or even possibly rises faster. In summary, when the TMM module has a leakage failure, when the TMM module opens a large cycle, the temperature change of the engine coolant has a strong correlation with the heat dissipation coefficient of the radiator. The heat dissipation coefficient of the radiator has strong correlation with the windward quantity of the vehicle, and the windward quantity of the vehicle can be controlled by the fan. Therefore, the windward quantity of the vehicle is increased by actively controlling the rotation of the fan, and whether the TMM module has leakage faults is identified by learning whether the temperature of engine cooling liquid generates larger temperature drop in the process of controlling the fan. The diagnosis method of the active control fan is simple, reliable and easy to realize, avoids the problem of high accuracy requirement of conventional water temperature model verification, is simple and easy to calibrate, can be used for TMM leakage fault diagnosis of the gasoline engine national six OBD cooling system only by determining the temperature drop threshold value of the leakage part, and is suitable for the leakage fault diagnosis of the TMM intelligent temperature regulating module.
In summary, according to the method for diagnosing the fault of the TMM module provided by the embodiment of the present application, by determining whether the coolant reaches the primary heat balance after the engine is started, and whether the TMM module does not start the large cycle, and whether the vehicle speed is within the preset vehicle speed range, and whether the fan has no fault; if the judgment result is yes, when the temperature of the cooling liquid has a peak, the fan is started at the maximum; judging whether the duration time of the fan exceeds a period of time; if yes, controlling to stop rotating the fan; learning an engine coolant temperature curve to calculate the temperature difference between a pair of adjacent wave peaks and wave troughs to obtain a coolant temperature drop value, wherein the temperature drop value is larger than a threshold value, the counting times are accumulated by 1, and judging whether the counting times accumulated value is larger than or equal to an accumulated threshold value; if the judgment result is that the accumulated value of the counting times is greater than or equal to the accumulated threshold value, the TMM module is diagnosed as having leakage fault, so that the method does not need to add any complex equipment, and the TMM leakage diagnosis can be completed by analyzing the difference between the leakage state of the TMM module and the cooling waterway in a normal state, and the method for actively controlling the fan is provided; and secondly, a complex model is not required to be constructed to calculate the temperature of the cooling liquid model, so that the cost of manpower and material resources is saved.
The following is a device embodiment of the present application, and details of the device embodiment that are not described in detail may refer to the corresponding method embodiment described above.
Fig. 3 is a block diagram of a TMM module fault diagnosis apparatus provided in an embodiment of the present application. Referring to fig. 3, the TMM module fault diagnosis apparatus includes: a fan-on pre-judging module 34, a fan-on module 35, a control fan-off module 36, a temperature drop value calculating module 37, a failure judging module 38, wherein,
the pre-fan-on judging module 34 is configured to judge whether the coolant reaches a primary heat balance after the engine is started, whether the TMM module does not start a large cycle, whether the vehicle speed is within a preset vehicle speed range, and whether the fan has no fault;
the fan starting module 35 is configured to, if the judgment result of the judgment module before the fan is started is yes, start the fan at a maximum when the cooling liquid temperature has a peak;
a control fan shut-off module 36 for determining whether the duration of the fan rotation exceeds a period of time, and if so, controlling to stop rotating the fan;
a temperature drop value calculation module 37, configured to learn an engine coolant temperature curve to calculate a temperature difference between a pair of adjacent wave peaks and wave troughs to obtain a coolant temperature drop value, wherein the temperature drop value is greater than a threshold value, the count number is accumulated by 1, and determine whether the count number accumulated value is greater than or equal to an accumulated threshold value;
the fault determining module 38 is configured to diagnose that the TMM module has a leakage fault if the temperature drop value calculating module determines that the counted number of times is equal to or greater than the accumulated threshold.
Preferably, the TMM module fault diagnosis apparatus further includes: a start temperature judgment module 31, an opening judgment module 32, and a coolant temperature judgment module 33;
the starting temperature judging module 31 is configured to judge whether the starting temperature of the engine is lower than a preset temperature and whether the ambient temperature is higher than the preset ambient temperature after the engine is successfully started;
the opening judging module 32 is configured to judge whether the opening of the TMM module is readable if the engine start temperature is lower than the preset temperature and the ambient temperature is higher than the preset ambient temperature and the TMM module has no faults of sensors and communication;
the coolant temperature judging module 33 is configured to judge whether the engine coolant temperature is lower than a minimum temperature of TMM closed-loop control if the engine controller can read the opening of the effective TMM module, and reset the timer and execute the pre-fan-on judging module if the engine coolant temperature is lower than the minimum temperature of TMM closed-loop control.
Preferably, the fan closing control module 36 is further configured to determine whether the duration of rotation of the fan exceeds a period of time, or whether the water temperature has a trough, or whether the large cycle is started, or whether the fan has a failure, or whether the vehicle speed exceeds a preset vehicle speed range, and if so, control to stop rotating the fan; or alternatively
The coolant temperature judging module 33 is further configured to judge whether the timer is started if the measured time exceeds the threshold time, and if the measured time exceeds the threshold time, it is diagnosed that the TMM module has no leakage fault, and if the measured time does not exceed the threshold time, it is executed if the measured time is not less than the minimum temperature of the TMM module; or alternatively
The temperature drop value calculation module 37 is further configured to execute the engine controller in the opening degree judgment module to judge whether the opening degree of the effective TMM module can be read if the judgment result is that the count number accumulated value is smaller than the accumulated threshold value; or alternatively
The starting temperature judging module 31 is further configured to end the diagnosis if the engine starting temperature is not lower than the preset temperature and the ambient temperature is not higher than the preset ambient temperature; or alternatively
The opening degree determination module 32 is also configured to end the diagnosis if the engine controller cannot read the opening degree of the valid TMM module. Wherein all of the above modules may be provided in an engine controller.
In summary, according to the TMM module fault diagnosis device provided in the embodiment of the present application, by determining whether the coolant reaches the primary heat balance after the engine is started, and whether the TMM module does not start the large cycle, and whether the vehicle speed is within the preset vehicle speed range, and whether the fan has no fault; if the judgment result is yes, when the temperature of the cooling liquid has a peak, the fan is started at the maximum; judging whether the duration time of the fan exceeds a period of time; if yes, controlling to stop rotating the fan; learning an engine coolant temperature curve to calculate the temperature difference between a pair of adjacent wave peaks and wave troughs to obtain a coolant temperature drop value, wherein the temperature drop value is larger than a threshold value, the counting times are accumulated by 1, and judging whether the counting times accumulated value is larger than or equal to an accumulated threshold value; if the judgment result is that the accumulated value of the counting times is greater than or equal to the accumulated threshold value, the TMM module is diagnosed as having leakage fault, so that the method does not need to add any complex equipment, and the TMM leakage diagnosis can be completed by analyzing the difference between the leakage state of the TMM module and the cooling waterway in a normal state, and the method for actively controlling the fan is provided; and secondly, a complex model is not required to be constructed to calculate the temperature of the cooling liquid model, so that the cost of manpower and material resources is saved.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the element defined by the phrase "comprising one … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element, and furthermore, elements having the same name in different embodiments of the present application may have the same meaning or may have different meanings, a particular meaning of which is to be determined by its interpretation in this particular embodiment or by further combining the context of this particular embodiment.
It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope herein. The word "if" as used herein may be interpreted as "at … …" or "at … …" or "responsive to a determination", depending on the context. Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes," and/or "including" specify the presence of stated features, steps, operations, elements, components, items, categories, and/or groups, but do not preclude the presence, presence or addition of one or more other features, steps, operations, elements, components, items, categories, and/or groups. The terms "or" and/or "as used herein are to be construed as inclusive, or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a, A is as follows; b, a step of preparing a composite material; c, performing operation; a and B; a and C; b and C; A. b and C). An exception to this definition will occur only when a combination of elements, functions, steps or operations are in some way inherently mutually exclusive.
It should be understood that, although the steps in the flowcharts in the embodiments of the present application are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited in order and may be performed in other orders, unless explicitly stated herein. Moreover, at least some of the steps in the figures may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, the order of their execution not necessarily occurring in sequence, but may be performed alternately or alternately with other steps or at least a portion of the other steps or stages.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. A TMM module fault diagnosis method, characterized by comprising:
after the engine is successfully started, judging whether the starting temperature of the engine is lower than a preset temperature and whether the ambient temperature is higher than the preset ambient temperature;
if the judgment result is that the engine starting temperature is lower than the preset temperature and the environment temperature is higher than the preset environment temperature, and the TMM module has no faults of sensors and communication, the engine controller judges whether the opening of the effective TMM module can be read;
if the engine controller can read the opening degree of the effective TMM module, judging whether the temperature of the engine coolant is lower than the lowest temperature of the closed-loop control of the TMM module;
when the temperature of the cooling liquid of the engine is lower than the lowest temperature of the closed-loop control of the TMM module, judging whether the cooling liquid reaches primary heat balance, whether the TMM module does not start large circulation, whether the vehicle speed is in a preset vehicle speed range and whether a fan has no fault;
if the judgment result is yes, when the temperature of the cooling liquid has a peak, the fan is started at the maximum;
judging whether the duration time of the fan exceeds a period of time;
if yes, controlling to stop rotating the fan;
learning an engine coolant temperature curve to calculate the temperature difference between a pair of adjacent wave peaks and wave troughs to obtain a coolant temperature drop value, wherein the temperature drop value is larger than a threshold value, the counting times are accumulated by 1, and judging whether the counting times accumulated value is larger than or equal to an accumulated threshold value;
if the judgment result is that the counting times accumulated value is larger than or equal to the accumulated threshold value, diagnosing that the TMM module has leakage faults.
2. The method of claim 1, wherein determining whether the fan has been rotated for a duration of time exceeding a period of time; if yes, control to stop rotating the fan, still include:
judging whether the continuous rotation time of the fan exceeds a period of time, or whether the water temperature is in a trough state, or whether the large circulation is started, or whether the fan fails, or whether the vehicle speed exceeds a preset vehicle speed range, if so, controlling to stop rotating the fan.
3. The method of claim 1, wherein determining whether the engine coolant temperature is below a minimum temperature for closed loop control of the TMM module further comprises:
if the temperature is higher than the lowest temperature of the TMM module closed-loop control, starting a timer, judging whether the timing time of the timer exceeds the threshold time, if the judgment result is that the timing time of the timer exceeds the threshold time, diagnosing that the TMM module has no leakage fault, and if the timing time of the timer does not exceed the threshold time, judging whether the temperature of the engine coolant is lower than the lowest temperature of the TMM module closed-loop control.
4. The method of claim 1, wherein determining whether the count-number accumulation value is equal to or greater than an accumulation threshold value further comprises:
and if the judgment result is that the count number accumulated value is smaller than the accumulated threshold value, the step of judging whether the opening of the effective TMM module can be read by the engine controller is performed.
5. The method of claim 1, wherein determining whether the engine start temperature is below a preset temperature and whether the ambient temperature is above a preset ambient temperature further comprises:
if the judgment result is that the engine starting temperature is not lower than the preset temperature and the environment temperature is not higher than the preset environment temperature, ending the diagnosis.
6. The method of claim 1, wherein the engine controller determining whether the opening of the valid TMM module is readable further comprises:
if the opening degree of the effective TMM module cannot be read by the engine controller, the diagnosis is ended.
7. A TMM module failure diagnosis apparatus, characterized by comprising: a judging module before the fan is started, a fan starting module, a fan closing control module, a temperature drop value calculating module, a fault judging module, a starting temperature judging module, an opening judging module and a cooling liquid temperature judging module, wherein,
the judging module before the fan is started is used for judging whether the cooling liquid reaches primary heat balance after the engine is started, whether the TMM module does not start large circulation, whether the speed of the vehicle is in a preset speed range and whether the fan has no fault;
the fan starting module is used for starting the fan at the maximum when the temperature of the cooling liquid has a peak if the judgment result of the judgment module before the fan is started is yes;
the control fan closing module is used for judging whether the continuous rotation time of the fan exceeds a period of time, and if so, stopping rotating the fan;
the temperature drop value calculation module is used for learning a temperature curve of the engine cooling liquid so as to calculate the temperature difference between a pair of adjacent wave peaks and wave troughs to obtain a cooling liquid temperature drop value, wherein the temperature drop value is larger than a threshold value, the counting times are accumulated by 1, and whether the counting times accumulated value is larger than or equal to an accumulated threshold value is judged;
the fault judging module is used for diagnosing that the TMM module has leakage fault if the temperature drop value calculating module judges that the counting times accumulated value is more than or equal to the accumulated threshold value;
the starting temperature judging module is used for judging whether the starting temperature of the engine is lower than a preset temperature or not and whether the ambient temperature is higher than the preset ambient temperature or not after the engine is successfully started;
the opening judging module is used for judging whether the opening of the effective TMM module can be read or not if the judging result is that the engine starting temperature is lower than the preset temperature and the environment temperature is higher than the preset environment temperature and the TMM module has no faults of sensors and communication;
and the cooling liquid temperature judging module is used for judging whether the temperature of the cooling liquid of the engine is lower than the lowest temperature of the closed-loop control of the TMM module or not if the opening of the effective TMM module can be read by the engine controller, resetting the timer if the temperature of the cooling liquid of the engine is lower than the lowest temperature of the closed-loop control of the TMM module, and executing the judging module before the fan is started.
8. The apparatus of claim 7, wherein the control fan shut-off module is further configured to determine whether the fan continues to rotate for a period of time, whether a trough occurs in the water temperature, whether a large cycle is turned on, whether the fan fails, or whether the vehicle speed exceeds a preset vehicle speed range, and if so, to control the fan to stop rotating; or alternatively
The cooling liquid temperature judging module is also used for judging whether the timing time of the timer exceeds the threshold time or not if the timing time of the timer exceeds the threshold time, diagnosing that the TMM module has no leakage fault, and executing the cooling liquid temperature judging module to judge whether the cooling liquid temperature of the engine is lower than the lowest temperature of the TMM module in the closed-loop control mode if the timing time of the timer does not exceed the threshold time; or alternatively
The temperature drop value calculation module is further used for executing the engine controller in the opening degree judgment module to judge whether the opening degree of the effective TMM module can be read or not if the judgment result is that the accumulated value of the counting times is smaller than the accumulated threshold value; or alternatively
The starting temperature judging module is also used for ending diagnosis if the judging result is that the starting temperature of the engine is not lower than the preset temperature and the ambient temperature is not higher than the preset ambient temperature; or alternatively
The opening degree judging module is also used for ending diagnosis if the opening degree of the effective TMM module can not be read by the engine controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110117152.XA CN114810325B (en) | 2021-01-28 | 2021-01-28 | TMM module leakage fault diagnosis method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110117152.XA CN114810325B (en) | 2021-01-28 | 2021-01-28 | TMM module leakage fault diagnosis method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114810325A CN114810325A (en) | 2022-07-29 |
| CN114810325B true CN114810325B (en) | 2023-05-16 |
Family
ID=82525750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110117152.XA Active CN114810325B (en) | 2021-01-28 | 2021-01-28 | TMM module leakage fault diagnosis method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114810325B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101008455B1 (en) * | 2008-07-29 | 2011-01-14 | 콘티넨탈 오토모티브 시스템 주식회사 | Method for diagnosing thermostat of car |
| CN102575565B (en) * | 2009-07-27 | 2016-05-04 | 通用电气公司 | Heat management system, means of transport and relevant method |
| US10060333B2 (en) * | 2016-05-02 | 2018-08-28 | Ford Global Technologies, Llc | Systems and methods for engine coolant system diagnostics |
| 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 |
| US10830651B2 (en) * | 2017-06-01 | 2020-11-10 | Nissan North America, Inc. | Thermostat monitoring system and method |
| CN107956573B (en) * | 2017-11-24 | 2019-06-28 | 广州汽车集团股份有限公司 | Thermostat method for diagnosing faults, device, computer equipment and storage medium |
-
2021
- 2021-01-28 CN CN202110117152.XA patent/CN114810325B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114810325A (en) | 2022-07-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2620928C2 (en) | Engine cooling system method (versions) and vehicle system | |
| RU2602845C2 (en) | Method of diagnostics of vehicle cooling system (versions) and vehicle | |
| US6085732A (en) | EGR fault diagnostic system | |
| US11454161B2 (en) | Thermostat fault diagnosis method and device, computer device and storage medium | |
| US8122858B2 (en) | Abnormality diagnosis apparatus for cooling system of vehicle | |
| CN108507763B (en) | Thermostat fault active diagnosis method and system | |
| JP3896288B2 (en) | Cooling system temperature estimation device | |
| CN110132381B (en) | Venturi differential pressure sensor credibility diagnosis method and device | |
| CN103362629A (en) | Engine cooling system control | |
| US20100095909A1 (en) | Engine cooling system onboard diagnostic strategy | |
| CN103362628A (en) | Engine cooling system control | |
| US6532807B1 (en) | Cooling system for an internal combustion engine in motor vehicles and operating process therefor | |
| US7380983B2 (en) | Method and device for checking temperature values of a temperature sensor of an internal combustion engine | |
| CN109653860B (en) | Thermostat rationality diagnosis method | |
| US20060217857A1 (en) | Fault diagnostic apparatus | |
| CN111852641B (en) | Thermostat diagnosis method and system, engine cooling system and electronic controller | |
| JPH10176534A (en) | Thermostat trouble detecting device for engine cooling system | |
| US20060078464A1 (en) | Anti tampering arrangement | |
| CN111577444B (en) | Cooling system diagnosis method based on thermal management module | |
| US20200326246A1 (en) | Thermostat monitoring system and method | |
| CN114810325B (en) | TMM module leakage fault diagnosis method and device | |
| EP1165949B1 (en) | A vehicle | |
| CN112834124B (en) | Internal leakage judgment method for EGR cooler and related device | |
| US8897955B2 (en) | Ozone converting catalyst fault identification systems and methods | |
| Nemati et al. | On-board diagnosis of vehicles cooling system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |