CN115324713A - Thermostat leakage monitoring method and thermostat leakage monitoring device - Google Patents
Thermostat leakage monitoring method and thermostat leakage monitoring device Download PDFInfo
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- CN115324713A CN115324713A CN202210867005.9A CN202210867005A CN115324713A CN 115324713 A CN115324713 A CN 115324713A CN 202210867005 A CN202210867005 A CN 202210867005A CN 115324713 A CN115324713 A CN 115324713A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- 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
- F01P11/16—Indicating devices; Other safety devices concerning coolant temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2031/00—Fail safe
- F01P2031/18—Detecting fluid leaks
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Abstract
The invention relates to a thermostat leakage monitoring method and a thermostat leakage monitoring device, wherein the thermostat leakage monitoring method is realized on the basis of an engine cooling system and an active air inlet grille system, a water outlet or a water inlet of an engine in the engine cooling system is provided with a temperature detection device, and the thermostat leakage monitoring method comprises the following steps: establishing a coolant temperature rise estimation model based on the engine energy conservation principle; acquiring the initial temperature, real-time heat generation and real-time heat consumption of cooling liquid at a water outlet or a water inlet of an engine; obtaining estimated temperature rise of the cooling liquid according to the real-time generated heat and the real-time consumed heat based on the estimated temperature rise model of the cooling liquid; acquiring real-time temperature detected by the temperature detection device; and judging whether the thermostat has a leakage fault according to the initial temperature, the estimated temperature rise of the cooling liquid and the real-time temperature. By establishing the coolant temperature rise estimation model, the accurate estimated coolant temperature rise can be obtained, and whether the thermostat has a leakage fault or not is effectively judged by combining the initial temperature and the real-time temperature.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a thermostat leakage monitoring method and a thermostat leakage monitoring device.
Background
Generally, a thermostat (or equivalent device, such as a thermal management system (TMM) or the like) is installed in an engine cooling system and is used for adjusting the temperature of coolant in the cooling system so that the engine can work in an optimal temperature range, thereby reducing the emission of gaseous pollutants of the engine and improving the oil consumption. In addition, the engine cooling system with the thermostat is installed according to the regulation requirement, and the temperature of the engine coolant cannot reach the engine warming temperature due to leakage failure of the thermostat needs to be monitored.
The working principle of the thermostat is shown in fig. 1, when the temperature of the cooling liquid of the engine cooling system does not reach the lower limit (such as 90 ℃) of the optimal working temperature of the engine, the thermostat is in a closed state, the electronic water pump does not operate, the active air inlet grille is closed, and the cooling liquid performs internal circulation through a water outlet of an engine cylinder body, the thermostat, the electronic water pump, a water inlet of the engine cylinder body and a water channel in the engine; when the temperature of the cooling liquid of the engine cooling system reaches the upper limit (such as 110 ℃) of the optimal working temperature of the engine, the thermostat is in an opening state, the electronic water pump runs, the active air inlet grille is opened, the cooling liquid circulates outside through the water outlet of the engine cylinder body, the thermostat, the radiator, the electronic water pump, the water inlet of the engine cylinder body and the water channel in the engine, and when the cab needs to be heated by warm air, partial cooling liquid circulates through the warm air under the working conditions of the internal circulation and the external circulation. Wherein, a water temperature sensor is generally arranged at a water outlet or a water inlet of an engine cylinder body to measure the temperature of the cooling liquid; for some vehicle models, a coolant heater is generally installed in the cooling system to heat the coolant rapidly at low ambient temperatures.
In the prior art, two thermostat leakage monitoring methods are mainly provided, the first monitoring method is a two-way water temperature method, namely, a coolant temperature sensor is respectively arranged at a water outlet of an engine cooling system and a water outlet of a radiator, in the engine warming process, the difference between the measured values of the two temperature sensors is used for judging, if the measured temperature difference value of the two temperature sensors is smaller than a calibration failure limit value, the judgment is that the engine has a fault, otherwise, the engine has no fault, the method needs to additionally add a coolant temperature sensor, and the cooling system with an electronic water pump cannot meet the accurate fault monitoring requirement; the second monitoring method is a single water temperature active monitoring method, namely, in the engine warming-up process, the electronic water pump and the like are actively controlled to work, the temperature change rate of the water temperature sensor of the cooling system is monitored to carry out fault identification, the monitoring time of the method is long, and the influence on the engine warming-up process is large.
Therefore, it is desirable to provide a thermostat leakage monitoring method that has accurate monitoring results, short monitoring time and less influence on the engine warm-up process to solve the above technical problems.
Disclosure of Invention
In order to solve the technical problem, the invention provides a thermostat leakage monitoring method. The method solves the technical problems that fault monitoring is not accurate enough when a two-way water temperature method is adopted for monitoring the leakage of the thermostat, monitoring time is long when a single-water-temperature active monitoring method is adopted for monitoring the leakage of the thermostat, and influence on the engine warming process is large in the prior art.
The technical effects of the invention are realized as follows:
a thermostat leakage monitoring method is realized based on an engine cooling system and an active air inlet grille system, a water outlet or a water inlet of an engine in the engine cooling system is provided with a temperature detection device, and the method comprises the following steps:
establishing a cooling liquid temperature rise estimation model based on the engine energy conservation principle;
acquiring the initial temperature, real-time heat generation and real-time heat consumption of cooling liquid at a water outlet or a water inlet of an engine;
obtaining estimated temperature rise of the cooling liquid according to the real-time generated heat and the real-time consumed heat based on the estimated temperature rise model of the cooling liquid;
acquiring real-time temperature detected by the temperature detection device;
and judging whether the thermostat has a leakage fault according to the initial temperature, the estimated temperature rise of the cooling liquid and the real-time temperature to finish monitoring the thermostat.
Further, based on the engine energy conservation principle, a coolant temperature rise prediction model is established, and the method comprises the following steps:
establishing a cooling liquid absorbed heat estimation model based on the engine energy conservation principle, wherein the estimated absorbed heat of the cooling liquid calculated by the cooling liquid absorbed heat estimation model is obtained according to the generated heat and the consumed heat of the engine;
and obtaining a cooling liquid temperature rise estimation model according to the cooling liquid absorption heat estimation model.
Further, the sum of real-time consumed heat of the engine and real-time absorbed heat of the cooling liquid is equal to the real-time generated heat of the engine, the real-time generated heat of the engine comprises total heat of fuel oil combustion and total heat of a cooling liquid heater, and the real-time consumed heat of the engine comprises air conditioner warm air heat exchange quantity, water tank radiator heat exchange quantity and engine body heat absorption quantity.
Further, the real-time consumed heat of the engine also comprises heat taken away by the engine for external work and engine exhaust. The method comprises the steps of establishing a coolant absorbed heat estimation model based on the engine energy conservation principle, determining estimated absorbed heat of the coolant by obtaining real-time generated heat comprising total heat of fuel oil combustion and total heat of a coolant heater and real-time consumed heat comprising heat taken away by engine work, engine exhaust, air conditioner warm air heat exchange quantity, water tank radiator heat exchange quantity and engine body heat absorption quantity, and obtaining estimated temperature rise of the coolant, so that whether a leakage fault occurs in a thermostat is effectively judged by combining the initial temperature and the real-time temperature of the coolant at a water outlet or a water inlet of the engine.
Further, when a water pump in the cooling system is a mechanical water pump, whether the thermostat has a leakage fault or not is judged according to the initial temperature, the estimated temperature rise of the cooling liquid and the real-time temperature so as to complete monitoring of the thermostat, and the method comprises the following steps:
obtaining the temperature of a cooling liquid model according to the initial temperature and the estimated temperature rise of the cooling liquid;
when the temperature of the cooling liquid model reaches a first set temperature, obtaining temperature deviation data according to the temperature of the cooling liquid model and the real-time temperature;
if the temperature deviation data is larger than or equal to a first set temperature difference, judging that the thermostat has a leakage fault, and quitting the monitoring process;
and if the temperature deviation data is smaller than the first set temperature difference, judging that the thermostat is normal, and quitting the monitoring process.
Further, a water pump in the engine cooling system is an electronic water pump, and whether the thermostat has a leakage fault or not is judged according to the initial temperature, the estimated temperature rise of the cooling liquid and the real-time temperature so as to complete monitoring of the thermostat, and the method comprises the following steps:
obtaining the model temperature of the cooling liquid according to the initial temperature and the estimated temperature rise of the cooling liquid;
when the temperature of the cooling liquid model reaches a first set temperature, obtaining temperature deviation data according to the temperature of the cooling liquid model and the real-time temperature;
and if the temperature deviation data is larger than or equal to the first set temperature difference, judging that the thermostat has a leakage fault, and quitting the monitoring process. Through in the engine warm-up process, the temperature of the cooling liquid model is estimated based on the cooling liquid heat absorption estimation model, when the temperature of the cooling liquid model reaches a first set temperature, the real-time temperature of the cooling liquid is combined, so that the leakage fault of the thermostat can be judged when the temperature deviation data is larger than or equal to the first set temperature difference, and the reliability of fault monitoring is improved.
Further, still include:
when the temperature deviation data is smaller than a first set temperature difference, an electronic water pump is forced to operate according to a preset rotating speed through an electric control unit of the automobile, and an active air inlet grille system is started;
acquiring a real-time maximum temperature and a real-time minimum temperature in real-time temperatures in a cooling liquid external circulation period, wherein the cooling liquid external circulation period is a period in which the electronic water pump is forced to operate according to a preset rotating speed;
and judging whether the thermostat has a leakage fault according to the real-time highest temperature and the real-time lowest temperature.
Further, judging whether the thermostat has a leakage fault according to the real-time highest temperature and the real-time lowest temperature, comprising the following steps:
obtaining a temperature drop amplitude according to the real-time highest temperature and the real-time lowest temperature;
when the temperature drop amplitude is smaller than a first set temperature drop, judging that the thermostat has no leakage fault, and quitting the monitoring process;
and when the temperature drop amplitude is larger than or equal to a second set temperature drop, judging that the thermostat has a leakage fault, and quitting the monitoring process.
Further, still include:
and when the temperature drop amplitude is greater than or equal to the first set temperature drop and less than the second set temperature drop, judging not, and exiting the monitoring process. In the engine warm-up process, the coolant model temperature is estimated based on the coolant heat absorption estimation model, the electronic water pump is forced to operate at a high speed and the active air inlet grille system is opened through the electric control unit of the automobile when the coolant model temperature reaches the first set temperature through setting, so that the temperature of the coolant changes in a short time, whether the thermostat breaks down or not can be judged quickly and effectively through the temperature drop amplitude of the coolant, the monitoring process consumes short time, and the influence on the engine warm-up process is small.
In addition, still provide a thermostat leakage monitoring device, monitoring devices realizes based on engine cooling system, and the delivery port or the water inlet of the engine among the engine cooling system are equipped with temperature-detecting device, include:
a temperature rise model establishing module: the method is used for establishing a cooling liquid temperature rise estimation model based on the engine energy conservation principle;
a real-time heat acquisition module: the system is used for acquiring the initial temperature, real-time heat generation and real-time heat consumption of the cooling liquid at a water outlet or a water inlet of the engine;
the temperature rise is estimated to obtain a module: the estimated temperature rise of the cooling liquid is obtained according to the real-time generated heat and the real-time consumed heat based on the estimated temperature rise model of the cooling liquid;
real-time temperature acquisition module: the real-time temperature detection device is used for acquiring real-time temperature detected by the temperature detection device;
a leakage fault determination module: and the temperature controller is used for judging whether the thermostat has leakage fault according to the initial temperature, the estimated temperature rise of the cooling liquid and the real-time temperature so as to complete the monitoring of the thermostat.
As described above, the present invention has the following advantageous effects:
1) The method comprises the steps of establishing a coolant absorbed heat estimation model based on the engine energy conservation principle, determining estimated absorbed heat of the coolant by obtaining real-time generated heat comprising total heat of fuel oil combustion and total heat of a coolant heater and real-time consumed heat comprising heat taken away by engine work, engine exhaust, air conditioner warm air heat exchange quantity, water tank radiator heat exchange quantity and engine body heat absorption quantity, and obtaining estimated temperature rise of the coolant, so that whether a leakage fault occurs in a thermostat is effectively judged by combining the initial temperature and the real-time temperature of the coolant at a water outlet or a water inlet of the engine.
2) In the engine warm-up process, the coolant model temperature is estimated based on the coolant heat absorption estimation model, the electronic water pump is forced to operate at a high speed and the active air inlet grille system is opened through the electric control unit of the automobile when the coolant model temperature reaches the first set temperature through setting, so that the temperature of the coolant changes in a short time, whether the thermostat breaks down or not can be judged quickly and effectively through the temperature drop amplitude of the coolant, the monitoring process consumes short time, and the influence on the engine warm-up process is small.
3) In the engine warming process, the temperature of the cooling liquid model is estimated based on the estimation model of the heat absorbed by the cooling liquid, and when the temperature of the cooling liquid model reaches a first set temperature, the real-time temperature of the cooling liquid is combined, so that the temperature of the thermostat can be judged to have a leakage fault when the temperature deviation data is greater than or equal to the first set temperature difference, and the reliability of fault monitoring is improved.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiment 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 invention, and that for a person skilled in the art it is also possible to derive other drawings from them without inventive effort.
FIG. 1 is a schematic diagram of an engine cooling system;
FIG. 2 is a flow chart of a thermostat leak monitoring method provided by an embodiment of the present disclosure;
fig. 3 is a flowchart of steps of determining whether a thermostat has a leakage fault according to the initial temperature, the estimated coolant temperature rise, and the real-time temperature to complete monitoring of the thermostat under the condition that a water pump in an engine cooling system is an electronic water pump according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a thermostat monitoring process provided by an embodiment of the present disclosure;
fig. 5 is a block diagram of a thermostat leakage monitoring apparatus according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1:
based on the connection relationship between the engine cooling system and the active grille shutter system shown in fig. 1, an embodiment of the present specification provides a thermostat leakage monitoring method, as shown in fig. 2, the monitoring method is implemented based on the engine cooling system and the active grille shutter system shown in fig. 1, a water outlet or a water inlet of an engine in the engine cooling system is provided with a temperature detection device, and the method includes:
s100: establishing a cooling liquid temperature rise estimation model based on the engine energy conservation principle;
s200: acquiring the initial temperature, real-time heat generation and real-time heat consumption of cooling liquid at a water outlet or a water inlet of an engine;
s300: obtaining estimated temperature rise of the cooling liquid according to the real-time generated heat and the real-time consumed heat based on the estimated temperature rise model of the cooling liquid;
in a specific embodiment, the step S100 of establishing a coolant temperature rise estimation model based on the engine energy conservation principle includes:
establishing a coolant absorption heat estimation model based on the engine energy conservation principle, wherein estimated coolant absorption heat calculated by the coolant absorption heat estimation model is obtained according to the generated heat and the consumed heat of the engine;
and obtaining a cooling liquid temperature rise estimation model according to the cooling liquid absorption heat estimation model.
Specifically, according to the principle of energy conservation of the engine, the real-time generated heat of the engine is equal to the real-time consumed heat of the engine and the real-time absorbed heat Q of the cooling liquid water And (3) performing the following steps:
Q comb +Q heat ＝Q power +Q exhuast +Q AC +Q air +Q cabin +Q eng +Q water 。
wherein the engineGenerating heat in real time including total heat Q of fuel combustion comb And total heat quantity Q of cooling liquid heater heat (ii) a The real-time heat consumption of the engine comprises the external work Q of the engine power Heat quantity Q taken away by engine exhaust exhuast And the heat exchange quantity Q of the warm air of the air conditioner AC Air heat exchange quantity Q air And the heat exchange quantity Q of the radiator of the water tank cabin And heat absorption capacity Q of engine body eng 。
Based on the formula of the energy conservation of the engine, a prediction model of the heat absorbed by the cooling liquid can be obtained:
Q water ＝Q comb +Q heat -(Q power +Q exhuast +Q AC +Q air +Q cabin +Q eng )
then according to the real-time absorbed heat Q of the cooling liquid water The calculation formula of (2):
Q water ＝M water *C water *ΔT water
wherein M is water For the quality of the cooling liquid, C water Is the coolant heat capacity ratio.
The estimated temperature rise delta T of the cooling liquid can be obtained water The calculation formula of (2), namely a cooling liquid temperature rise estimation model:
s400: acquiring real-time temperature detected by the temperature detection device;
s500: and judging whether the thermostat has a leakage fault according to the initial temperature, the estimated temperature rise of the cooling liquid and the real-time temperature so as to complete the monitoring of the thermostat.
In one specific embodiment, the water pump in the engine cooling system is a mechanical water pump:
step S500, according to the initial temperature, the estimated temperature rise of the cooling liquid and the real-time temperature, judging whether the thermostat has a leakage fault so as to complete the monitoring of the thermostat, and the method comprises the following steps:
obtaining the temperature of a cooling liquid model according to the initial temperature and the estimated temperature rise of the cooling liquid;
when the temperature of the cooling liquid model reaches a first set temperature, obtaining temperature deviation data according to the temperature of the cooling liquid model and the real-time temperature;
if the temperature deviation data is larger than or equal to a first set temperature difference, judging that the thermostat has a leakage fault, and quitting the monitoring process;
and if the temperature deviation data is smaller than the first set temperature difference, judging that the thermostat is normal, and quitting the monitoring process.
Specifically, the mechanical water pump operates following the engine operation regardless of the coolant model temperature, without active control.
Specifically, when the engine is started cold, the thermostat is opened only after the temperature of the coolant rises to 80-90 ℃ after a certain warm-up process. The principle of this application thermostat leakage monitoring is because the engine only has the coolant liquid extrinsic cycle in the heat engine operation in-process, and under the normal conditions, the engine only has the coolant liquid inner cycle at the warm-up in-process, consequently, the thermostat leakage monitoring method of this application is used for monitoring at engine warm-up in-process, and the thermostat whether takes place the leakage of coolant liquid, whether has coolant liquid to leak to the radiator from the thermostat promptly, forms the coolant liquid extrinsic cycle. Therefore, the first set temperature T is generally set to be close to and smaller than the coolant temperature of the engine in the operating state, in the present embodiment 1 First set temperature difference DeltaT 0 Can be based on the ambient temperature T Evn Set to a first set temperature T 1 A first set temperature difference Delta T 0 And ambient temperature T Evn Are shown in tables 1 and 2, respectively, that is, the first set temperature T is 25 ℃ at normal temperature 1 At 70 deg.C, a first set temperature difference DeltaT 0 Is 10 ℃. Wherein the ambient temperature T Evn May be obtained by the electronic control unit of the vehicle.
| T Evn /℃ | -10 | -5 | 0 | 10 | 25 | 45 |
| T 1 /℃ | 60 | 62 | 65 | 68 | 70 | 72 |
TABLE 1
| T Evn /℃ | -10 | -5 | 0 | 10 | 25 | 45 |
| ΔT 0 /℃ | 20 | 15 | 13 | 12 | 10 | 9 |
TABLE 2
Specifically, in the warming-up process of the engine, the model temperature of the cooling liquid is calculated and obtained through the initial temperature and the estimated temperature rise of the cooling liquid, so that when the model temperature of the cooling liquid reaches a first set temperature, the model temperature of the cooling liquid and the real-time temperature are differed to obtain temperature deviation data, namely the difference between the first set temperature and the real-time temperature is obtained to obtain the temperature deviation data, and whether the thermostat has a leakage fault or not is judged according to the temperature deviation data and the first set temperature difference.
In another specific embodiment, the water pump in the engine cooling system is an electronic water pump:
as shown in fig. 3, the step S500 of determining whether the thermostat has a leakage fault according to the initial temperature, the estimated temperature rise of the coolant, and the real-time temperature to complete monitoring of the thermostat includes:
s510: obtaining the model temperature of the cooling liquid according to the initial temperature and the estimated temperature rise of the cooling liquid;
s520: when the temperature of the cooling liquid model reaches a first set temperature, obtaining temperature deviation data according to the temperature of the cooling liquid model and the real-time temperature;
s530: if the temperature deviation data is larger than or equal to a first set temperature difference, judging that the thermostat has a leakage fault, and quitting the monitoring process;
s540: when the temperature deviation data is smaller than a first set temperature difference, an electronic water pump is forced to operate according to a preset rotating speed through an electric control unit of the automobile, and an active air inlet grille system is started;
s550: acquiring a real-time highest temperature and a real-time lowest temperature in real-time temperatures in a cooling liquid external circulation period, wherein the cooling liquid external circulation period is a period in which an electronic water pump is forced to operate according to a preset rotating speed and an active air inlet grille system is opened;
specifically, the electronic water pump and the active air inlet grid system are controlled to be started by an electronic control unit of the automobile when the engine enters a working state.
Specifically, the temperature detection device in this embodiment is a temperature sensor, the detection period of the temperature sensor is generally 100ms, the external circulation period of the cooling liquid is generally 30s, 300 real-time temperature data can be obtained through a monitoring process within 30s, and the real-time maximum temperature and the real-time minimum temperature are obtained from 300 real-time temperatures and are differentiated to obtain the temperature drop amplitude.
S560: and judging whether the thermostat has a leakage fault according to the real-time highest temperature and the real-time lowest temperature.
Specifically, the electronic control unit of the automobile forcibly requests the active grille shutter system to be turned on and the electronic water pump to operate, and the electronic water pump operates at a higher rotation speed, in this embodiment, the preset rotation speed is set to 2000r/min.
In a specific embodiment, the step S560 of determining whether the thermostat has a leakage fault according to the real-time maximum temperature and the real-time minimum temperature includes:
obtaining a temperature drop amplitude according to the real-time maximum temperature and the real-time minimum temperature;
when the temperature drop amplitude is smaller than a first set temperature drop, judging that the thermostat has no leakage fault, and quitting the monitoring process;
when the temperature drop amplitude is larger than or equal to a second set temperature drop, judging that the thermostat has a leakage fault, and quitting the monitoring process;
and when the temperature drop amplitude is greater than or equal to the first set temperature drop and less than the second set temperature drop, judging not, and exiting the monitoring process.
Specifically, under the conditions of forced opening of the active intake grille system and operation of the electronic water pump, if the temperature drop amplitude is smaller than a first set temperature drop, that is, under the adjustment of the thermostat, the difference between the real-time maximum temperature and the real-time minimum temperature is not large, it is indicated that the thermostat is in a normal working state, and the temperature of the coolant in the engine cooling system can be adjusted normally, that is, it can be determined that the thermostat does not have a leakage fault.
The first set temperature drop is defined as that when the temperature drop amplitude is smaller than the first set temperature drop, the thermostat is determined to have no leakage fault, and the second set temperature drop is defined as that when the temperature drop amplitude is larger than or equal to the second set temperature drop, the thermostat is determined to have the leakage fault. In this embodiment, the first set temperature drop Δ T 1 And the second set temperature drop delta T 2 Can be dependent on the ambient temperature T Evn Setting is performed, the first setting temperature drop DeltaT 1 And the second set temperature drop delta T 2 And ambient temperature T Evn The first set temperature drop DeltaT is shown in Table 3 and Table 4, respectively, at 25 deg.C 1 At 10 deg.C, a second set temperature drop Δ T 2 The temperature was 15 ℃.
| T Evn /℃ | -10 | -5 | 0 | 10 | 25 | 45 |
| ΔT 1 /℃ | 15 | 13 | 12 | 11 | 10 | 8 |
TABLE 3
| T Evn /℃ | -10 | -5 | 0 | 10 | 25 | 45 |
| ΔT 2 /℃ | 20 | 18 | 17 | 16 | 15 | 13 |
TABLE 4
It should be noted that, in the engine warm-up process, the coolant model temperature is estimated based on the coolant heat absorption estimation model, the electronic water pump is forced to operate at a high speed and the active air intake grille system is opened through the electronic control unit of the automobile when the coolant model temperature reaches the first set temperature, so that the temperature of the coolant changes in a short time, whether the thermostat breaks down or not can be quickly and effectively judged through the temperature drop amplitude of the coolant, the monitoring process consumes short time, and the influence on the engine warm-up process is small.
Specifically, the thermostat leakage monitoring method of the present application has the following diagnostic physical conditions that need to be satisfied:
(1) Ambient temperature T Env ≥T Env0 (e.g., -10 ℃);
(2) When the engine is started, the temperature of the cooling liquid is less than or equal to the starting nominal temperature of the thermostat, wherein under the general condition, the temperature of the cooling liquid = the starting nominal temperature of the thermostat-31 ℃ when the engine is started, and the optimal value of the temperature of the cooling liquid is 45 ℃ when the engine is started;
(3) The proportion of the idle time of the engine in the total warming time is less than or equal to 50 percent;
(4) Average intake air flow rate greater than Q intake ，Q intake Is 5g/s;
(5) The current driving cycle monitoring is completed;
(6) The temperature sensor for monitoring the temperature of the cooling liquid has no faults, such as open circuit of a circuit, short power supply, short ground, unreasonable signal and the like;
(7) The temperature sensor for monitoring the ambient temperature has no faults, such as open circuit of a circuit, short power supply, short ground, unreasonable signal and the like;
(8) The electronic water pump and the active air inlet grille system have no faults, such as open circuit of a circuit, short power supply, short ground and the like.
As shown in fig. 5, an embodiment of the present specification further provides a thermostat leakage monitoring device, where the monitoring device is implemented based on an engine cooling system, and a water outlet or a water inlet of an engine in the engine cooling system is provided with a temperature detecting device, and the thermostat leakage monitoring device includes:
temperature rise model building module 601: the method is used for establishing a cooling liquid temperature rise estimation model based on the engine energy conservation principle;
real-time heat acquisition module 602: the system is used for acquiring the initial temperature, real-time heat generation and real-time heat consumption of the cooling liquid at the water outlet or the water inlet of the engine;
the temperature rise estimation module 603: the estimated temperature rise of the cooling liquid is obtained according to the real-time generated heat and the real-time consumed heat based on the estimated temperature rise model of the cooling liquid;
real-time temperature obtaining module 604: the real-time temperature acquisition device is used for acquiring the real-time temperature detected by the temperature detection device;
leak fault determination module 605: and the temperature controller is used for judging whether the thermostat has leakage fault according to the initial temperature, the estimated temperature rise of the cooling liquid and the real-time temperature so as to complete the monitoring of the thermostat.
Although the present invention has been described by way of preferred embodiments, the present invention is not limited to the embodiments described herein, and various changes and modifications may be made without departing from the scope of the present invention.
The embodiments and features of the embodiments described herein above can be combined with each other without conflict.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (10)
1. A thermostat leakage monitoring method is realized based on an engine cooling system, and a temperature detection device is arranged at a water outlet or a water inlet of an engine in the engine cooling system, and is characterized by comprising the following steps:
establishing a coolant temperature rise estimation model based on the engine energy conservation principle;
acquiring the initial temperature, real-time heat generation and real-time heat consumption of cooling liquid at a water outlet or a water inlet of an engine;
obtaining estimated temperature rise of the cooling liquid according to the real-time generated heat and the real-time consumed heat based on the estimated temperature rise model of the cooling liquid;
acquiring real-time temperature detected by the temperature detection device;
and judging whether the thermostat has a leakage fault according to the initial temperature, the estimated temperature rise of the cooling liquid and the real-time temperature so as to complete the monitoring of the thermostat.
2. The thermostat leakage monitoring method of claim 1, wherein establishing a coolant temperature rise prediction model based on the engine energy conservation principle includes:
establishing a cooling liquid absorbed heat estimation model based on the engine energy conservation principle, wherein the estimated absorbed heat of the cooling liquid calculated by the cooling liquid absorbed heat estimation model is obtained according to the generated heat and the consumed heat of the engine;
and obtaining a cooling liquid temperature rise estimation model according to the cooling liquid absorption heat estimation model.
3. The thermostat leakage monitoring method of claim 2 wherein the real-time heat consumption of the engine, including total fuel combustion heat and total coolant heater heat, and the real-time heat absorption of the coolant, including air conditioner heater heat, air heat, radiator heat, and engine block heat absorption, sum equals the real-time heat production of the engine.
4. The thermostat leakage monitoring method of claim 3, wherein the real-time heat consumed by the engine further comprises heat removed by the engine exhaust and work done externally by the engine.
5. The thermostat leakage monitoring method according to claim 3 or 4, a water pump in an engine cooling system is a mechanical water pump, and the method is characterized in that whether a thermostat has a leakage fault or not is judged according to the initial temperature, the estimated coolant temperature rise and the real-time temperature so as to complete the monitoring of the thermostat, and comprises the following steps:
obtaining the model temperature of the cooling liquid according to the initial temperature and the estimated temperature rise of the cooling liquid;
when the temperature of the cooling liquid model reaches a first set temperature, obtaining temperature deviation data according to the temperature of the cooling liquid model and the real-time temperature;
if the temperature deviation data is larger than or equal to a first set temperature difference, judging that the thermostat has a leakage fault, and quitting the monitoring process;
and if the temperature deviation data is smaller than the first set temperature difference, judging that the thermostat is normal, and quitting the monitoring process.
6. The thermostat leakage monitoring method according to claim 3 or 4, a water pump in an engine cooling system being an electronic water pump, wherein the determining whether a thermostat has a leakage fault according to the initial temperature, the estimated coolant temperature rise and the real-time temperature to complete the thermostat monitoring comprises:
obtaining the model temperature of the cooling liquid according to the initial temperature and the estimated temperature rise of the cooling liquid;
when the temperature of the cooling liquid model reaches a first set temperature, obtaining temperature deviation data according to the temperature of the cooling liquid model and the real-time temperature;
and if the temperature deviation data is larger than or equal to the first set temperature difference, judging that the thermostat has a leakage fault, and exiting the monitoring process.
7. The thermostat leakage monitoring method of claim 6, an active intake grille system connected between a thermostat of the engine cooling system and a water pump, further comprising:
when the temperature deviation data is smaller than a first set temperature difference, an electronic water pump is forced to operate according to a preset rotating speed through an electric control unit of the automobile, and an active air inlet grille system is started;
acquiring a real-time highest temperature and a real-time lowest temperature in real-time temperatures in a cooling liquid external circulation period, wherein the cooling liquid external circulation period is a period in which the electronic water pump is forced to operate according to a preset rotating speed;
and judging whether the thermostat has a leakage fault according to the real-time highest temperature and the real-time lowest temperature.
8. The thermostat leakage monitoring method of claim 7, wherein determining whether a thermostat has a leakage fault based on the real-time maximum temperature and the real-time minimum temperature comprises:
obtaining a temperature drop amplitude according to the real-time highest temperature and the real-time lowest temperature;
when the temperature drop amplitude is smaller than a first set temperature drop, judging that the thermostat has no leakage fault, and quitting the monitoring process;
and when the temperature drop amplitude is larger than or equal to a second set temperature drop, judging that the thermostat has a leakage fault, and quitting the monitoring process.
9. The thermostat leak monitoring method of claim 8, further comprising:
and when the temperature drop amplitude is greater than or equal to the first set temperature drop and less than the second set temperature drop, judging not, and exiting the monitoring process.
10. The utility model provides a thermostat leakage monitoring device, monitoring devices realizes based on engine cooling system, and the delivery port or the water inlet of engine among the engine cooling system are equipped with temperature-detecting device, its characterized in that includes:
a temperature rise model establishing module: the method is used for establishing a cooling liquid temperature rise estimation model based on the engine energy conservation principle;
a real-time heat acquisition module: the system is used for acquiring the initial temperature, real-time heat generation and real-time heat consumption of the cooling liquid at the water outlet or the water inlet of the engine;
the temperature rise estimation module: the estimated temperature rise of the cooling liquid is obtained according to the real-time generated heat and the real-time consumed heat based on the estimated temperature rise model of the cooling liquid;
real-time temperature acquisition module: the real-time temperature acquisition device is used for acquiring the real-time temperature detected by the temperature detection device;
a leakage fault determination module: and the temperature controller is used for judging whether the thermostat has leakage fault according to the initial temperature, the estimated temperature rise of the cooling liquid and the real-time temperature so as to complete the monitoring of the thermostat.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115962040A (en) * | 2023-02-02 | 2023-04-14 | 重庆赛力斯新能源汽车设计院有限公司 | Engine cooling control method, system, equipment and storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115962040A (en) * | 2023-02-02 | 2023-04-14 | 重庆赛力斯新能源汽车设计院有限公司 | Engine cooling control method, system, equipment and storage medium |
| CN115962040B (en) * | 2023-02-02 | 2024-06-11 | 重庆赛力斯新能源汽车设计院有限公司 | Engine cooling control method, system, equipment and storage medium |
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