CN118057259A - Temperature control method, equipment, system and storage medium - Google Patents
Temperature control method, equipment, system and storage medium Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000003860 storage Methods 0.000 title claims abstract description 13
- 238000009833 condensation Methods 0.000 claims abstract description 74
- 230000005494 condensation Effects 0.000 claims abstract description 74
- 239000000203 mixture Substances 0.000 claims abstract description 31
- 239000007789 gas Substances 0.000 claims description 412
- 238000011144 upstream manufacturing Methods 0.000 claims description 61
- 239000000446 fuel Substances 0.000 claims description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 239000002826 coolant Substances 0.000 claims description 17
- 239000000110 cooling liquid Substances 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 description 13
- 238000004891 communication Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
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- 238000005516 engineering process Methods 0.000 description 6
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- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 4
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- 238000002485 combustion reaction Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
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- 229910052799 carbon Inorganic materials 0.000 description 1
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- 238000009826 distribution Methods 0.000 description 1
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Abstract
The application discloses a temperature control method, equipment, a system and a storage medium, which are used for controlling the temperature of mixed gas in an EGR (exhaust gas recirculation) air inlet pipeline so as to ensure that the EGR system can still be normally used in a low-temperature environment. The method comprises the following steps: acquiring the temperature of mixed gas in an air inlet pipeline of an EGR system, wherein the mixed gas comprises EGR gas and air; judging whether the temperature of the mixed gas is less than the condensation temperature; when the temperature of the mixture gas is less than the condensation temperature, the temperature of the mixture gas is raised to be greater than the condensation temperature by increasing the temperature of the EGR gas. The scheme provided by the application is adopted: the temperature of the mixed gas in the EGR air inlet pipeline can be kept higher than the condensation temperature, and the condition that the EGR system cannot be used due to the condensation phenomenon of the EGR system in a low-temperature environment is avoided.
Description
Technical Field
The present application relates to the field of temperature control technologies, and in particular, to a temperature control method, device, system, and storage medium.
Background
The low-pressure EGR (Exhaust Gas recirculation) system can greatly reduce the oil consumption of the engine, and can well meet the requirements of energy conservation and emission reduction and the low oil consumption of the engine. The existing EGR system can generate a large amount of condensed water when the ambient temperature is lower than 5-7 ℃, and at the moment, if the EGR system is used strongly, the condensed water can enter a compressor of the turbocharger, so that the compressor is damaged.
Therefore, in order to avoid damage to the compressor, the EGR system cannot be used normally under the condition of low ambient temperature, and further oil consumption and carbon dioxide emission are improved.
In view of this, how to ensure the normal use of the EGR system under the condition of low ambient temperature is a technical problem to be solved urgently.
Disclosure of Invention
The application provides a temperature control method, equipment, a system and a storage medium, which are used for controlling the temperature of mixed gas in an EGR (exhaust gas recirculation) air inlet pipeline so as to ensure that the EGR system can still be normally used in a low-temperature environment.
The application provides a temperature control method, which comprises the following steps:
Acquiring the temperature of mixed gas in an air inlet pipeline of an EGR system, wherein the mixed gas comprises EGR gas and air;
judging whether the temperature of the mixed gas is less than the condensation temperature;
When the temperature of the mixture gas is less than the condensation temperature, the temperature of the mixture gas is raised to be greater than the condensation temperature by increasing the temperature of the EGR gas.
The application has the beneficial effects that: and when the temperature of the mixed gas is smaller than the condensation temperature, the temperature of the mixed gas is increased to be higher than the condensation temperature. And the temperature of the mixed gas in the EGR air inlet pipeline can be higher than the condensation temperature, and the condition that the EGR system cannot be used due to the condensation phenomenon of the EGR system in a low-temperature environment is avoided.
In one embodiment, the obtaining the temperature of the mixed gas in the air inlet pipeline of the EGR system includes:
Acquiring the temperature and the flow of EGR gas entering an air inlet pipeline and the temperature and the flow of air entering the air inlet pipeline;
Substituting the temperature and the flow of the EGR gas entering the air inlet pipeline and the temperature and the flow of the air entering the air inlet pipeline into a first preset formula to determine the temperature of the mixed gas in the air inlet pipeline.
In one embodiment, substituting the temperature and the flow of the EGR gas entering the intake pipe and the temperature and the flow of the air entering the intake pipe into a first preset formula to determine the temperature of the mixture in the intake pipe includes:
Substituting the temperature and the flow of the EGR gas entering the air inlet pipeline into the following first preset formula to determine the temperature of the mixed gas in the air inlet pipeline:
Wherein T is the temperature of the mixed gas in the air inlet pipeline; v 1 is EGR gas flow into the intake line; v 2 is the air flow into the intake line; m 1 is the molar mass of EGR gas entering the intake line; m 2 is the molar mass of air entering the intake line; t 1 is the temperature of the EGR gas entering the intake line; t 2 is the temperature of the air entering the intake line.
In one embodiment, the flow rate of the EGR gas entering the intake pipe is obtained by:
determining a flow area of the EGR gas, an upstream and downstream pressure of the EGR valve, an entropy index of the EGR gas, and an actual temperature upstream of the EGR valve;
Substituting the flow area of the EGR gas, the upstream and downstream pressure of the EGR valve, the entropy index of the EGR gas and the actual temperature of the upstream of the EGR valve into a second preset formula to obtain the flow of the EGR gas entering the air inlet pipeline.
In one embodiment, substituting the flow area of the EGR gas, the pressure upstream and downstream of the EGR valve, the entropy index of the EGR gas, and the actual temperature upstream of the EGR valve into a second preset formula to obtain the EGR gas flow rate into the intake pipe includes:
Substituting the flow area of the EGR gas, the upstream and downstream pressure of the EGR valve, the entropy index of the EGR gas and the actual temperature upstream of the EGR valve into the following second preset formula to obtain the flow rate of the EGR gas entering the air inlet pipeline:
Wherein V 1 is the flow rate of EGR gas in the intake pipe; ar e is the flow area of the EGR gas, P eu is the upstream measured pressure of the EGR valve, P r is the ratio of the downstream measured pressure to the upstream measured pressure of the EGR valve, k is the entropy index (adiabatic index) of the EGR gas, and T eu is the measured temperature upstream of the EGR valve.
In one embodiment, the determining whether the temperature of the mixed gas is less than the condensation temperature includes:
Determining the humidity of the mixed gas;
Determining the condensation temperature of the mixed gas in the current humidity state based on a preset relation table, wherein the preset relation table is used for recording the corresponding relation between the gas humidity and the condensation temperature;
And judging whether the current temperature of the mixed gas is less than the condensation temperature of the mixed gas in the current humidity state.
In one embodiment, the determining the humidity of the mixed gas includes:
acquiring the humidity and the flow of EGR gas entering an air inlet pipeline and the humidity and the flow of air entering the air inlet pipeline;
and substituting the humidity and the flow of the EGR gas entering the air inlet pipeline and the humidity and the flow of the air entering the air inlet pipeline into a third preset formula to determine the humidity of the mixed gas in the air inlet pipeline.
In one embodiment, substituting the humidity and the flow of the EGR gas entering the intake pipe and the humidity and the flow of the air entering the intake pipe into a third preset formula to determine the humidity of the mixed gas in the intake pipe includes:
Substituting the humidity and the flow of the EGR gas entering the air inlet pipeline and the humidity and the flow of the air entering the air inlet pipeline into the following third preset formula to determine the humidity of the mixed gas in the air inlet pipeline:
Wherein, Humidity of the mixed gas: /(I)Is the humidity of the EGR gas; /(I)V 1 is the EGR gas flow, which is the humidity of air; v 2 is the air flow into the intake line.
In one embodiment, the increasing the temperature of the EGR gas to raise the temperature of the mixture to greater than the condensation temperature includes:
Reducing the opening degree of an EGR (exhaust gas Recirculation) cooling liquid control valve according to a preset step length, and acquiring the temperature of mixed gas in an air inlet pipeline of an EGR system, wherein the smaller the opening degree of the EGR cooling liquid control valve is, the higher the temperature of the EGR gas in the mixed gas is;
and stopping reducing the opening degree of the EGR cooling liquid control valve when the temperature of the mixed gas in the air inlet pipeline of the EGR system rises above the condensation temperature.
In one embodiment, the humidity of the EGR gas entering the intake line is calculated by:
determining the fuel quantity in unit time of the engine;
Determining the water content of EGR gas entering an air inlet pipeline according to the fuel quantity and the air water content of the engine;
and determining the humidity of the EGR gas entering the air inlet pipeline according to the water content of the EGR gas.
The present application also provides a temperature control apparatus for performing the method described in any one of the above embodiments, including:
a turbocharger for discharging at least part of the exhaust gases from the engine into the EGR cooler;
an EGR cooler connected to the turbocharger for performing a cooling operation on EGR gas received from the turbocharger and sending the EGR gas into an intake line;
An EGR valve for adjusting the flow rate of EGR gas fed from the EGR cooler into the intake pipe;
The air inlet pipeline is used for receiving the EGR gas sent by the EGR cooler and air in the external environment and sending mixed gas consisting of the EGR gas and the air in the external environment into a compressor of the turbocharger;
An engine connected to the EGR cooler for delivering coolant to the EGR cooler;
An EGR coolant control valve is disposed between the engine and the EGR cooler for controlling a flow of coolant delivered to the EGR cooler.
The application also provides a temperature control device, comprising:
The system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the temperature of mixed gas in an air inlet pipeline of an EGR system, and the mixed gas comprises EGR gas and air;
The judging module is used for judging whether the temperature of the mixed gas is less than the condensation temperature;
And a lifting module for lifting the temperature of the mixed gas to be greater than the condensation temperature by increasing the temperature of the EGR gas when the temperature of the mixed gas is less than the condensation temperature.
In one embodiment, the acquisition module includes:
A first acquisition sub-module for acquiring the temperature and flow rate of the EGR gas entering the intake pipe, and the temperature and flow rate of the air entering the intake pipe;
And the first determining submodule is used for substituting the temperature and the flow of the EGR gas entering the air inlet pipeline and the temperature and the flow of the air entering the air inlet pipeline into a first preset formula so as to determine the temperature of the mixed gas in the air inlet pipeline.
In one embodiment, substituting the temperature and the flow of the EGR gas entering the intake pipe and the temperature and the flow of the air entering the intake pipe into a first preset formula to determine the temperature of the mixture in the intake pipe includes:
Substituting the temperature and the flow of the EGR gas entering the air inlet pipeline into the following first preset formula to determine the temperature of the mixed gas in the air inlet pipeline:
Wherein T is the temperature of the mixed gas in the air inlet pipeline; v 1 is EGR gas flow into the intake line; v 2 is the air flow into the intake line; m 1 is the molar mass of EGR gas entering the intake line; m 2 is the molar mass of air entering the intake line; t 1 is the temperature of the EGR gas entering the intake line; t 2 is the temperature of the air entering the intake line.
In one embodiment, the flow rate of the EGR gas entering the intake pipe is obtained by:
determining a flow area of the EGR gas, an upstream and downstream pressure of the EGR valve, an entropy index of the EGR gas, and an actual temperature upstream of the EGR valve;
Substituting the flow area of the EGR gas, the upstream and downstream pressure of the EGR valve, the entropy index of the EGR gas and the actual temperature of the upstream of the EGR valve into a second preset formula to obtain the flow of the EGR gas entering the air inlet pipeline.
In one embodiment, substituting the flow area of the EGR gas, the pressure upstream and downstream of the EGR valve, the entropy index of the EGR gas, and the actual temperature upstream of the EGR valve into a second preset formula to obtain the EGR gas flow rate into the intake pipe includes:
Substituting the flow area of the EGR gas, the upstream and downstream pressure of the EGR valve, the entropy index of the EGR gas and the actual temperature upstream of the EGR valve into the following second preset formula to obtain the flow rate of the EGR gas entering the air inlet pipeline:
Wherein V 1 is the flow rate of EGR gas in the intake pipe; ar e is the flow area of the EGR gas, P eu is the upstream measured pressure of the EGR valve, P r is the ratio of the downstream measured pressure to the upstream measured pressure of the EGR valve, k is the entropy index (adiabatic index) of the EGR gas, and T eu is the measured temperature upstream of the EGR valve.
In one embodiment, the determining module includes:
a second determination submodule for determining the humidity of the mixed gas;
A third determining submodule, configured to determine a condensation temperature of the mixed gas in a current humidity state based on a preset relationship table, where the preset relationship table is used to record a correspondence between gas humidity and the condensation temperature;
And the judging submodule is used for judging whether the current temperature of the mixed gas is less than the condensation temperature of the mixed gas in the current humidity state.
In one embodiment, the second determination submodule is further configured to:
acquiring the humidity and the flow of EGR gas entering an air inlet pipeline and the humidity and the flow of air entering the air inlet pipeline;
and substituting the humidity and the flow of the EGR gas entering the air inlet pipeline and the humidity and the flow of the air entering the air inlet pipeline into a third preset formula to determine the humidity of the mixed gas in the air inlet pipeline.
In one embodiment, substituting the humidity and the flow of the EGR gas entering the intake pipe and the humidity and the flow of the air entering the intake pipe into a third preset formula to determine the humidity of the mixed gas in the intake pipe includes:
Substituting the humidity and the flow of the EGR gas entering the air inlet pipeline and the humidity and the flow of the air entering the air inlet pipeline into the following third preset formula to determine the humidity of the mixed gas in the air inlet pipeline:
Wherein, Humidity of the mixed gas: /(I)Is the humidity of the EGR gas; /(I)V 1 is the EGR gas flow, which is the humidity of air; v 2 is the air flow into the intake line.
In one embodiment, the lifting module comprises:
The control submodule is used for reducing the opening of the EGR cooling liquid control valve according to a preset step length and acquiring the temperature of the mixed gas in an air inlet pipeline of the EGR system, wherein the smaller the opening of the EGR cooling liquid control valve is, the higher the temperature of the EGR gas in the mixed gas is;
and the stopping submodule is used for stopping reducing the opening degree of the EGR cooling liquid control valve when the temperature of the mixed gas in the air inlet pipeline of the EGR system rises above the condensation temperature.
In one embodiment, the humidity of the EGR gas entering the intake line is calculated by:
determining the fuel quantity in unit time of the engine;
Determining the water content of EGR gas entering an air inlet pipeline according to the fuel quantity and the air water content of the engine;
and determining the humidity of the EGR gas entering the air inlet pipeline according to the water content of the EGR gas.
The application also provides a temperature control system, comprising:
At least one processor; and
A memory communicatively coupled to the at least one processor; wherein,
The memory stores instructions executable by the at least one processor to implement the temperature control method described in any of the embodiments above.
The present application also provides a computer readable storage medium, which when executed by a processor corresponding to a temperature control system, enables the temperature control system to implement the temperature control method described in any one of the above embodiments.
The application also provides a vehicle comprising the temperature control device or the temperature control system according to any one of the embodiments.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
The technical scheme of the application is further described in detail through the drawings and the embodiments.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate the application and together with the embodiments of the application, serve to explain the application. In the drawings:
FIG. 1 is a flow chart of a temperature control method according to an embodiment of the application;
FIG. 2 is a schematic diagram of a temperature control apparatus according to an embodiment of the present application;
FIG. 3 is a schematic diagram illustrating a temperature control apparatus according to an embodiment of the present application;
fig. 4 is a schematic hardware structure of a temperature control system according to the present application.
Detailed Description
The preferred embodiments of the present application will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present application only, and are not intended to limit the present application.
FIG. 1 is a flow chart of a temperature control method for controlling the temperature of a mixture in an EGR intake passage according to an embodiment of the present application, which can be implemented as steps S101-S103 as shown in FIG. 1:
In step S101, the temperature of a mixed gas in an intake pipe of an EGR system, the mixed gas including EGR gas and air;
The application adjusts the temperature of the mixed gas in the EGR air inlet pipeline by judging whether the temperature of the mixed gas in the air inlet pipeline is lower than the current condensation temperature. Therefore, it is necessary to determine the temperature in the current intake line. Fig. 2 is a schematic diagram of a temperature control apparatus according to an embodiment of the present application, and the method provided in the present application may be applied to the apparatus shown in fig. 2. As shown in fig. 2, the apparatus includes: a turbocharger for discharging at least part of the exhaust gases from the engine into the EGR cooler; an EGR cooler connected to the turbocharger for performing a cooling operation on EGR gas received from the turbocharger and sending the EGR gas into an intake line; an EGR valve for adjusting the flow rate of EGR gas fed from the EGR cooler into the intake pipe; the air inlet pipeline is used for receiving the EGR gas sent by the EGR cooler and air in the external environment and sending mixed gas consisting of the EGR gas and the air in the external environment into a compressor of the turbocharger; an engine connected to the EGR cooler for delivering coolant to the EGR cooler; an EGR coolant control valve is disposed between the engine and the EGR cooler for controlling a flow of coolant delivered to the EGR cooler.
The temperature and flow rate of the EGR gas entering the intake pipe and the temperature and flow rate of the air entering the intake pipe are acquired. Specifically, as shown in fig. 2, the temperature of the EGR gas that enters the intake pipe is monitored by a temperature sensor provided after the EGR cooler; the temperature of the air taken into the air intake passage is obtained by a temperature sensor provided in the air intake passage. Monitoring the flow of air entering the air inlet pipeline by an air flowmeter; the flow V 1 of the EGR gas entering the air inlet pipeline is obtained by monitoring the pressure of the upstream and downstream of the EGR valve through a differential pressure sensor and is determined according to the following formula:
Wherein V 1 is the flow rate of EGR gas in the intake pipe; ar e is the flow area of the EGR gas, P eu is the upstream measured pressure of the EGR valve, P r is the ratio of the downstream measured pressure to the upstream measured pressure of the EGR valve, k is the entropy index (adiabatic index) of the EGR gas, and T eu is the measured temperature upstream of the EGR valve.
After the flow rate and the air flow rate of the EGR gas entering the air inlet pipeline are determined, the temperature and the flow rate of the EGR gas entering the air inlet pipeline and the temperature and the flow rate of the air entering the air inlet pipeline are substituted into a first preset formula to determine the temperature of the mixed gas in the air inlet pipeline. Specifically, the temperature T of the mixture gas in the intake pipe may be obtained by:
Wherein T is the temperature of the mixed gas in the air inlet pipeline; v 1 is EGR gas flow into the intake line; v 2 is the air flow into the intake line; m 1 is the molar mass of EGR gas entering the intake line; m 2 is the molar mass of air entering the intake line; t 1 is the temperature of the EGR gas entering the intake line; t 2 is the temperature of the air entering the intake line. In step S102, it is determined whether the temperature of the mixed gas is less than the condensation temperature;
To determine the condensation temperature of the current EGR system, first, the humidity of the mixture is determined.
Specifically, the humidity and the flow rate of EGR gas entering an air inlet pipeline and the humidity and the flow rate of air entering the air inlet pipeline are obtained; the method in step S101 is consistent with the monitoring of the gas flow, and therefore, the description thereof is omitted. The humidity of the air entering the air inlet pipeline is obtained by a humidity sensor arranged on the air inlet pipeline; the humidity of the EGR gas entering the intake pipe can also be monitored by a humidity sensor, but in view of the structural arrangement, the application does not need to install a humidity sensor separately, but is calculated by:
In this embodiment, the humidity of the EGR gas entering the intake pipe is obtained by using the fuel consumption parameter of the vehicle, specifically, the fuel quantity in unit time of the engine is obtained by obtaining the vehicle-mounted system parameter, and the fuel consumption is generally calculated according to the mileage, for example, the compact vehicle quantity is more than 7L-10L/100 km. For example, when the vehicle runs for 40km for 1 hour, the fuel consumption of the vehicle is 8L, and the fuel consumption converted into 1 hour is 3.2L. Since the volume of water and carbon dioxide generated after the combustion of the fuel per unit volume is fixed, the water content of the EGR gas entering the intake pipe can be determined according to the fuel amount of the engine and the water content of the air. In addition, the recovery ratio of the fuel exhaust gas is fixed, that is, the total amount of EGR gas that enters the EGR system per unit volume of the fuel exhaust gas is fixed, and therefore, the water content is also fixed, and the humidity of the EGR gas that enters the intake pipe can be determined from the water content of the EGR gas.
Substituting the humidity and the flow of the EGR gas entering the air inlet pipeline and the humidity and the flow of the air entering the air inlet pipeline into a third preset formula to determine the humidity of the mixed gas in the air inlet pipeline. Specifically, due to the obtained humidity of the EGR gasAnd humidity of air/>And the EGR gas flow V 1 and the air flow V 2 entering the air inlet pipeline are obtained, so that the water content of the mixed gas entering the air inlet pipeline is obtained to be/>And further obtaining the humidity calculation formula of the mixed gas as follows:
Wherein, Humidity of the mixed gas: /(I)Is the humidity of the EGR gas; /(I)V 1 is the EGR gas flow, which is the humidity of air; v 2 is the air flow into the intake line.
Secondly, determining the condensation temperature of the mixed gas in the current humidity state based on a preset relation table, wherein the preset relation table is used for recording the corresponding relation between the gas humidity and the condensation temperature; since other humidities are mixed in the air inlet pipeline, the dew condensation temperature under the current humidity can be obtained according to the corresponding relation between the gas humidity and the dew condensation temperature.
And finally, judging whether the current temperature of the mixed gas is less than the condensation temperature of the mixed gas in the current humidity state.
In step S103, when the temperature of the mixture gas is less than the condensation temperature, the temperature of the mixture gas is raised to be greater than the condensation temperature by increasing the temperature of the EGR gas.
By comparing the temperature of the mixed gas in the current air inlet pipeline with the condensation temperature, whether the condensation risk exists or not can be known. If the temperature of the mixed gas is less than the condensation temperature, condensation occurs, and therefore, it is necessary to heat the temperature of the mixed gas. Specifically, as shown in fig. 2, the smaller the opening of the EGR coolant control valve is, the higher the EGR gas temperature in the mixture gas is, and therefore, the opening of the EGR coolant control valve is decreased according to a preset step to increase the temperature of the EGR gas and thus the temperature of the mixture gas. Meanwhile, the temperature of the mixed gas in the air inlet pipeline of the EGR system is monitored in real time, and when the temperature of the mixed gas in the air inlet pipeline of the EGR system rises above the condensation temperature, the opening degree of the EGR cooling liquid control valve is stopped being reduced.
In one embodiment of the application, in order to further avoid the risk of condensation, when the temperature difference of the temperature of the mixture gas higher than the condensation temperature is smaller than a preset temperature difference, the temperature of the mixture gas is raised to be higher than the condensation temperature by increasing the temperature of the EGR gas.
The application has the beneficial effects that: and when the temperature of the mixed gas is smaller than the condensation temperature, the temperature of the mixed gas is increased to be higher than the condensation temperature. And the temperature of the mixed gas in the EGR air inlet pipeline can be higher than the condensation temperature, and the condition that the EGR system cannot be used due to the condensation phenomenon of the EGR system in a low-temperature environment is avoided.
In one embodiment, the step S101 may be implemented as steps A1-A2 as follows:
In step A1, the temperature and flow rate of EGR gas entering the intake pipe, and the temperature and flow rate of air entering the intake pipe are obtained;
In the present embodiment, as shown in fig. 2, the temperatures of the EGR gas and the air may be acquired in real time by the temperature sensor. The temperature of the air can be obtained in real time through an air flow meter and is determined through the following formula:
Wherein V 1 is the flow rate of EGR gas in the intake pipe; ar e is the flow area of the EGR gas, P eU is the upstream measured pressure of the EGR valve, P r is the ratio of the downstream measured pressure to the upstream measured pressure of the EGR valve, k is the entropy index (adiabatic index) of the EGR gas, and T eu is the measured temperature upstream of the EGR valve.
In step A2, the temperature and the flow rate of the EGR gas entering the intake pipe and the temperature and the flow rate of the air entering the intake pipe are substituted into a first preset formula to determine the temperature of the mixture gas in the intake pipe.
In this embodiment, the temperature T of the mixture gas in the intake pipe may be obtained by the following formula:
Wherein T is the temperature of the mixed gas in the air inlet pipeline; v 1 is EGR gas flow into the intake line; v 2 is the air flow into the intake line; m 1 is the molar mass of EGR gas entering the intake line; m 2 is the molar mass of air entering the intake line; t 1 is the temperature of the EGR gas entering the intake line; t 2 is the temperature of the air entering the intake line. In one embodiment, the flow rate of the EGR gas entering the intake line is obtained by the following steps B1-B2:
In step B1, determining a flow area of the EGR gas, an upstream-downstream pressure of the EGR valve, a constant entropy index of the EGR gas, and a measured temperature upstream of the EGR valve;
Here, the flow area Ar e of the EGR gas is a cross section of the gas pipe, and thus is a fixed value. The upstream and downstream pressure of the EGR valve can be obtained through real-time monitoring of a differential pressure sensor, and the ratio of the downstream pressure and the upstream pressure of the EGR valve is further obtained. The constant entropy index k of the EGR gas is 400k, which is a representative outlet temperature, and is 1.396. The actual temperature T eu upstream of the EGR valve may be measured by a temperature sensor.
In step B2, the flow area of the EGR gas, the upstream and downstream pressure of the EGR valve, the entropy index of the EGR gas, and the actual temperature upstream of the EGR valve are substituted into a second preset formula to obtain the flow rate of the EGR gas entering the intake pipe.
In combination with the collected parameters, for the flow m e of the EGR gas entering the air inlet pipeline, the measured pressure at the upstream and downstream of the EGR valve is monitored by a differential pressure sensor and is determined according to the following second preset formula:
Wherein V 1 is the flow rate of EGR gas in the intake pipe; ar e is the flow area of the EGR gas, P eu is the upstream measured pressure of the EGR valve, P r is the ratio of the downstream measured pressure to the upstream measured pressure of the EGR valve, k is the entropy index (adiabatic index) of the EGR gas, T eu is the measured temperature upstream of the EGR valve, and R is the thermodynamic constant.
In one embodiment, the above step S102 may be implemented as steps C1-C3 as follows:
in step C1, determining the humidity of the mixed gas;
In order to obtain the humidity of the mixed gas, the embodiment obtains the humidity and the flow rate of the EGR gas entering the intake pipe, and the humidity and the flow rate of the air entering the intake pipe; the monitoring of the gas flow rate is the same as the foregoing method, and therefore, a detailed description is omitted. The humidity of the air entering the air inlet pipeline is obtained by a humidity sensor arranged on the air inlet pipeline.
In this embodiment, the humidity of the EGR gas entering the intake pipe is obtained through the vehicle fuel consumption parameter, specifically, the fuel quantity in unit time of the engine is obtained first, and the fuel quantity can be obtained through the vehicle-mounted system parameter. In addition, since the volume of water and carbon dioxide produced after combustion of a unit volume of fuel is fixed, the water content of EGR gas entering the intake pipe can be determined based on the fuel amount of the engine and the water content of air. Since the recovery ratio of the fuel exhaust gas is fixed, that is, the total amount of the EGR gas entering the EGR system per unit volume of the fuel exhaust gas is fixed, the water content is also fixed, and thus the humidity of the EGR gas entering the intake pipe can be determined based on the water content of the EGR gas.
Due to the obtained humidity of the EGR gasAnd humidity of air/>In addition, the EGR gas flow V 1 and the air flow V 2 entering the air inlet pipeline are obtained, so that the water content of the mixed gas entering the air inlet pipeline is obtained to be/>And further to obtain the humidity/>, of the mixed gasThe corresponding calculation formula (i.e., the third preset formula) is as follows:
Wherein, Humidity of the mixed gas: /(I)Is the humidity of the EGR gas; /(I)V 1 is the EGR gas flow, which is the humidity of air; v 2 is the air flow into the intake line.
In step C2, determining a condensation temperature of the mixed gas in the current humidity state based on a preset relation table, where the preset relation table is used to record a corresponding relation between the gas humidity and the condensation temperature;
Since other humidities are mixed in the air inlet pipeline, the dew condensation temperature under the current humidity can be obtained according to the corresponding relation between the gas humidity and the dew condensation temperature.
In step C3, it is determined whether the current temperature of the mixed gas is less than the condensation temperature of the mixed gas in the current humidity state.
In one embodiment, the above step C1 may be implemented as steps C11-C12 as follows:
in step C11, the humidity and flow rate of the EGR gas entering the intake pipe, and the humidity and flow rate of the air entering the intake pipe are acquired;
Acquiring the humidity and the flow of EGR gas entering an air inlet pipeline and the humidity and the flow of air entering the air inlet pipeline; the monitoring of the gas flow is consistent with the foregoing method, and therefore, a detailed description is omitted. The humidity of the air entering the air inlet pipeline is obtained by a humidity sensor arranged on the air inlet pipeline.
In this embodiment, the humidity of the EGR gas entering the intake pipe is obtained by using the fuel consumption parameter of the vehicle, specifically, the fuel quantity in unit time of the engine is obtained by obtaining the vehicle-mounted system parameter, and the fuel consumption is generally calculated according to the mileage, for example, the compact vehicle quantity is more than 7L-10L/100 km. For example, when the vehicle runs for 40km for 1 hour, the fuel consumption of the vehicle is 8L, and the fuel consumption converted into 1 hour is 3.2L. Since the volume of water and carbon dioxide generated after the combustion of the fuel per unit volume is fixed, the water content of the EGR gas entering the intake pipe can be determined according to the fuel amount of the engine and the water content of the air. In addition, the recovery ratio of the fuel exhaust gas is fixed, that is, the total amount of EGR gas that enters the EGR system per unit volume of the fuel exhaust gas is fixed, and therefore, the water content is also fixed, and the humidity of the EGR gas that enters the intake pipe can be determined from the water content of the EGR gas.
In step C12, the humidity and the flow rate of the EGR gas entering the intake pipe and the humidity and the flow rate of the air entering the intake pipe are substituted into a third preset formula to determine the humidity of the mixture gas in the intake pipe.
In one embodiment, the above step C12 may be implemented as the following steps:
Substituting the humidity and the flow of the EGR gas entering the air inlet pipeline and the humidity and the flow of the air entering the air inlet pipeline into the following third preset formula to determine the humidity of the mixed gas in the air inlet pipeline:
Wherein, Humidity of the mixed gas: /(I)Is the humidity of the EGR gas; /(I)V 1 is the EGR gas flow, which is the humidity of air; v 2 is the air flow into the intake line.
Due to the obtained humidity of the EGR gasAnd humidity of air/>In addition, the EGR gas flow V 1 and the air flow V 2 entering the air inlet pipeline are obtained, so that the water content of the mixed gas entering the air inlet pipeline is obtained to be/>And further obtaining a third preset formula as follows:
Wherein, Humidity of the mixed gas: /(I)Is the humidity of the EGR gas; /(I)V 1 is the EGR gas flow, which is the humidity of air; v 2 is the air flow into the intake line.
In one embodiment, the step S103 may be implemented as steps D1-D2 as follows:
In step D1, reducing the opening of an EGR (exhaust gas Recirculation) cooling liquid control valve according to a preset step length, and acquiring the temperature of mixed gas in an air inlet pipeline of an EGR system, wherein the smaller the opening of the EGR cooling liquid control valve is, the higher the temperature of EGR gas in the mixed gas is;
In step D2, when the temperature of the mixture gas in the EGR system intake pipe rises above the condensation temperature, the decrease in the opening degree of the EGR coolant control valve is stopped.
By comparing the temperature of the mixed gas in the current air inlet pipeline with the condensation temperature, whether the condensation risk exists or not can be known. If the temperature of the mixed gas is less than the condensation temperature, condensation occurs, and therefore, it is necessary to heat the temperature of the mixed gas. Specifically, as shown in fig. 2, the smaller the opening of the EGR coolant control valve is, the higher the EGR gas temperature in the mixture gas is, and therefore, the opening of the EGR coolant control valve is decreased according to a preset step to increase the temperature of the EGR gas and thus the temperature of the mixture gas. Meanwhile, the temperature of the mixed gas in the air inlet pipeline of the EGR system is monitored in real time, and when the temperature of the mixed gas in the air inlet pipeline of the EGR system rises above the condensation temperature, the opening degree of the EGR cooling liquid control valve is stopped being reduced.
In one embodiment, the humidity of the EGR gas entering the intake line is calculated by:
determining the fuel quantity in unit time of the engine;
Determining the water content of EGR gas entering an air inlet pipeline according to the fuel quantity and the air water content of the engine;
and determining the humidity of the EGR gas entering the air inlet pipeline according to the water content of the EGR gas.
Fig. 2 is a temperature control apparatus according to an embodiment of the present application, as shown in fig. 2, the temperature control apparatus includes:
a turbocharger for discharging at least part of the exhaust gases from the engine into the EGR cooler;
an EGR cooler connected to the turbocharger for performing a cooling operation on EGR gas received from the turbocharger and sending the EGR gas into an intake line;
An EGR valve for adjusting the flow rate of EGR gas fed from the EGR cooler into the intake pipe;
The air inlet pipeline is used for receiving the EGR gas sent by the EGR cooler and air in the external environment and sending mixed gas consisting of the EGR gas and the air in the external environment into a compressor of the turbocharger;
An engine connected to the EGR cooler for delivering coolant to the EGR cooler;
An EGR coolant control valve is disposed between the engine and the EGR cooler for controlling a flow of coolant delivered to the EGR cooler.
Fig. 3 is a temperature control device according to an embodiment of the application, as shown in fig. 3, including:
An acquisition module 301, configured to acquire a temperature of a mixed gas in an intake pipe of the EGR system, where the mixed gas includes EGR gas and air;
A judging module 302, configured to judge whether the temperature of the mixed gas is less than the condensation temperature;
And a lifting module 303 for lifting the temperature of the mixture to be greater than the condensation temperature by increasing the temperature of the EGR gas when the temperature of the mixture is less than the condensation temperature.
In one embodiment, the acquisition module includes:
A first acquisition sub-module for acquiring the temperature and flow rate of the EGR gas entering the intake pipe, and the temperature and flow rate of the air entering the intake pipe;
And the first determining submodule is used for substituting the temperature and the flow of the EGR gas entering the air inlet pipeline and the temperature and the flow of the air entering the air inlet pipeline into a first preset formula so as to determine the temperature of the mixed gas in the air inlet pipeline.
In one embodiment, substituting the temperature and the flow of the EGR gas entering the intake pipe and the temperature and the flow of the air entering the intake pipe into a first preset formula to determine the temperature of the mixture in the intake pipe includes:
Substituting the temperature and the flow of the EGR gas entering the air inlet pipeline into the following first preset formula to determine the temperature of the mixed gas in the air inlet pipeline:
Wherein T is the temperature of the mixed gas in the air inlet pipeline; v 1 is EGR gas flow into the intake line; v 2 is the air flow into the intake line; m 1 is the molar mass of EGR gas entering the intake line; m 2 is the molar mass of air entering the intake line; t 1 is the temperature of the EGR gas entering the intake line; t 2 is the temperature of the air entering the intake line.
In one embodiment, the flow rate of the EGR gas entering the intake pipe is obtained by:
determining a flow area of the EGR gas, an upstream and downstream pressure of the EGR valve, an entropy index of the EGR gas, and an actual temperature upstream of the EGR valve;
Substituting the flow area of the EGR gas, the upstream and downstream pressure of the EGR valve, the entropy index of the EGR gas and the actual temperature of the upstream of the EGR valve into a second preset formula to obtain the flow of the EGR gas entering the air inlet pipeline.
In one embodiment, substituting the flow area of the EGR gas, the pressure upstream and downstream of the EGR valve, the entropy index of the EGR gas, and the actual temperature upstream of the EGR valve into a second preset formula to obtain the EGR gas flow rate into the intake pipe includes:
Substituting the flow area of the EGR gas, the upstream and downstream pressure of the EGR valve, the entropy index of the EGR gas and the actual temperature upstream of the EGR valve into the following second preset formula to obtain the flow rate of the EGR gas entering the air inlet pipeline:
Wherein V 1 is the flow rate of EGR gas in the intake pipe; ar e is the flow area of the EGR gas, P eu is the upstream measured pressure of the EGR valve, P r is the ratio of the downstream measured pressure to the upstream measured pressure of the EGR valve, k is the entropy index (adiabatic index) of the EGR gas, and T eu is the measured temperature upstream of the EGR valve.
In one embodiment, the determining module includes:
a second determination submodule for determining the humidity of the mixed gas;
A third determining submodule, configured to determine a condensation temperature of the mixed gas in a current humidity state based on a preset relationship table, where the preset relationship table is used to record a correspondence between gas humidity and the condensation temperature;
And the judging submodule is used for judging whether the current temperature of the mixed gas is less than the condensation temperature of the mixed gas in the current humidity state.
In one embodiment, the second determination submodule is further configured to:
acquiring the humidity and the flow of EGR gas entering an air inlet pipeline and the humidity and the flow of air entering the air inlet pipeline;
and substituting the humidity and the flow of the EGR gas entering the air inlet pipeline and the humidity and the flow of the air entering the air inlet pipeline into a third preset formula to determine the humidity of the mixed gas in the air inlet pipeline.
In one embodiment, substituting the humidity and the flow of the EGR gas entering the intake pipe and the humidity and the flow of the air entering the intake pipe into a third preset formula to determine the humidity of the mixed gas in the intake pipe includes:
Substituting the humidity and the flow of the EGR gas entering the air inlet pipeline and the humidity and the flow of the air entering the air inlet pipeline into the following third preset formula to determine the humidity of the mixed gas in the air inlet pipeline:
Wherein, Humidity of the mixed gas: /(I)Is the humidity of the EGR gas; /(I)V 1 is the EGR gas flow, which is the humidity of air; v 2 is the air flow into the intake line.
In one embodiment, the lifting module comprises:
The control submodule is used for reducing the opening of the EGR cooling liquid control valve according to a preset step length and acquiring the temperature of the mixed gas in an air inlet pipeline of the EGR system, wherein the smaller the opening of the EGR cooling liquid control valve is, the higher the temperature of the EGR gas in the mixed gas is;
and the stopping submodule is used for stopping reducing the opening degree of the EGR cooling liquid control valve when the temperature of the mixed gas in the air inlet pipeline of the EGR system rises above the condensation temperature.
In one embodiment, the humidity of the EGR gas entering the intake line is calculated by:
determining the fuel quantity in unit time of the engine;
Determining the water content of EGR gas entering an air inlet pipeline according to the fuel quantity and the air water content of the engine;
and determining the humidity of the EGR gas entering the air inlet pipeline according to the water content of the EGR gas.
Fig. 4 is a schematic hardware structure of a temperature control system according to the present application, as shown in fig. 4, the system includes:
At least one processor 420; and
A memory 404 communicatively coupled to the at least one processor; wherein,
The memory 404 stores instructions executable by the at least one processor 420 for implementing the temperature control method described in any of the above embodiments.
Referring to fig. 4, the temperature control system 400 may include one or more of the following components: a processing component 402, a memory 404, a power supply component 406, a multimedia component 408, an audio component 410, an input/output (I/O) interface 412, a sensor component 414, and a communication component 416.
The processing assembly 402 generally controls the overall operation of the temperature control system 400. The processing component 402 may include one or more processors 420 to execute instructions to perform all or part of the steps of the methods described above. Further, the processing component 402 can include one or more modules that facilitate interaction between the processing component 402 and other components. For example, the processing component 402 may include a multimedia module to facilitate interaction between the multimedia component 408 and the processing component 402.
The memory 404 is configured to store various types of data to support the operation of the temperature control system 400. Examples of such data include instructions, such as text, pictures, video, etc., for any application or method operating on the temperature control system 400. The memory 404 may be implemented by any type or combination of volatile or nonvolatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.
The power supply component 406 provides power to the various components of the temperature control system 400. The power components 406 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for the in-vehicle control system 400.
The multimedia component 408 includes a screen between the temperature control system 400 and the user that provides an output interface. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from a user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensor may sense not only the boundary of a touch or sliding action, but also the duration and pressure associated with the touch or sliding operation. In some embodiments, the multimedia component 408 can also include a front-facing camera and/or a rear-facing camera. When the temperature control system 400 is in an operational mode, such as a photographing mode or a video mode, the front camera and/or the rear camera may receive external multimedia data. Each front camera and rear camera may be a fixed optical lens system or have focal length and optical zoom capabilities.
The audio component 410 is configured to output and/or input audio signals. For example, the audio component 410 includes a Microphone (MIC) configured to receive external audio signals when the temperature control system 400 is in an operational mode, such as an alarm mode, a recording mode, a voice recognition mode, and a voice output mode. The received audio signals may be further stored in the memory 404 or transmitted via the communication component 416. In some embodiments, audio component 410 further includes a speaker for outputting audio signals.
The I/O interface 412 provides an interface between the processing component 402 and peripheral interface modules, which may be a keyboard, click wheel, buttons, etc. These buttons may include, but are not limited to: homepage button, volume button, start button, and lock button.
The sensor assembly 414 includes one or more sensors for providing status assessment of various aspects of the temperature control system 400. For example, the sensor assembly 414 may include a sound sensor. In addition, the sensor assembly 414 may detect the on/off status of the temperature control system 400, the relative positioning of the components, such as the display and keypad of the temperature control system 400, the sensor assembly 414 may also detect the operational status of the temperature control system 400 or one of the components of the temperature control system 400, such as the operational status of the air distribution plate, the structural status, the operational status of the discharge flight, etc., the orientation or acceleration/deceleration of the temperature control system 400, and the temperature change of the temperature control system 400. The sensor assembly 414 may include a proximity sensor configured to detect the presence of nearby objects in the absence of any physical contact. The sensor assembly 414 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 414 may also include an acceleration sensor, a gyroscopic sensor, a magnetic sensor, a pressure sensor, a material bulk thickness sensor, or a temperature sensor.
The communication component 416 is configured to enable the temperature control system 400 to provide communication capabilities in a wired or wireless manner with other devices and cloud platforms. The temperature control system 400 may access a wireless network based on a communication standard, such as WiFi,2G, or 3G, or a combination thereof. In one exemplary embodiment, the communication component 416 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, the communication component 416 further includes a Near Field Communication (NFC) module to facilitate short range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, ultra Wideband (UWB) technology, bluetooth (BT) technology, and other technologies.
In an exemplary embodiment, the temperature control system 400 may be implemented by one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic elements for performing the temperature control method described in any of the embodiments above.
The present application also provides a computer readable storage medium, wherein when instructions in the storage medium are executed by a processor corresponding to a temperature control system, the temperature control system is enabled to implement the temperature control method described in any one of the above embodiments.
The application also provides a vehicle comprising the temperature control device or the temperature control system according to any one of the embodiments.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (14)
1. A method of controlling temperature, comprising:
Acquiring the temperature of mixed gas in an air inlet pipeline of an EGR system, wherein the mixed gas comprises EGR gas and air;
judging whether the temperature of the mixed gas is less than the condensation temperature;
When the temperature of the mixture gas is less than the condensation temperature, the temperature of the mixture gas is raised to be greater than the condensation temperature by increasing the temperature of the EGR gas.
2. The method of claim 1, wherein said obtaining the temperature of the mixture in the intake line of the EGR system comprises:
Acquiring the temperature and the flow of EGR gas entering an air inlet pipeline and the temperature and the flow of air entering the air inlet pipeline;
Substituting the temperature and the flow of the EGR gas entering the air inlet pipeline and the temperature and the flow of the air entering the air inlet pipeline into a first preset formula to determine the temperature of the mixed gas in the air inlet pipeline.
3. The method of claim 2, wherein substituting the EGR gas temperature and flow rate into the intake line and the air temperature and flow rate into the intake line into a first predetermined formula to determine the temperature of the mixture in the intake line comprises:
Substituting the temperature and the flow of the EGR gas entering the air inlet pipeline into the following first preset formula to determine the temperature of the mixed gas in the air inlet pipeline:
Wherein T is the temperature of the mixed gas in the air inlet pipeline; v 1 is EGR gas flow into the intake line; v 2 is the air flow into the intake line; m 1 is the molar mass of EGR gas entering the intake line; m 2 is the molar mass of air entering the intake line; t 1 is the temperature of the EGR gas entering the intake line; t 2 is the temperature of the air entering the intake line.
4. The method according to claim 2, wherein the flow rate of EGR gas into the intake line is obtained by:
determining a flow area of the EGR gas, an upstream and downstream pressure of the EGR valve, an entropy index of the EGR gas, and an actual temperature upstream of the EGR valve;
Substituting the flow area of the EGR gas, the upstream and downstream pressure of the EGR valve, the entropy index of the EGR gas and the actual temperature of the upstream of the EGR valve into a second preset formula to obtain the flow of the EGR gas entering the air inlet pipeline.
5. The method of claim 4, wherein substituting the flow area of the EGR gas, the pressure upstream and downstream of the EGR valve, the entropy index of the EGR gas, and the actual temperature upstream of the EGR valve into a second predetermined formula to obtain the EGR gas flow rate into the intake line comprises:
Substituting the flow area of the EGR gas, the upstream and downstream pressure of the EGR valve, the entropy index of the EGR gas and the actual temperature upstream of the EGR valve into the following second preset formula to obtain the flow rate of the EGR gas entering the air inlet pipeline:
Wherein V 1 is the flow rate of EGR gas in the intake pipe; ar e is the flow area of the EGR gas, P eu is the upstream measured pressure of the EGR valve, P r is the ratio of the downstream measured pressure to the upstream measured pressure of the EGR valve, k is the entropy index (adiabatic index) of the EGR gas, and T eu is the measured temperature upstream of the EGR valve.
6. The method of claim 1, wherein said determining whether the temperature of the mixed gas is less than a condensation temperature comprises:
Determining the humidity of the mixed gas;
Determining the condensation temperature of the mixed gas in the current humidity state based on a preset relation table, wherein the preset relation table is used for recording the corresponding relation between the gas humidity and the condensation temperature;
And judging whether the current temperature of the mixed gas is less than the condensation temperature of the mixed gas in the current humidity state.
7. The method of claim 6, wherein said determining the humidity of the mixed gas comprises:
acquiring the humidity and the flow of EGR gas entering an air inlet pipeline and the humidity and the flow of air entering the air inlet pipeline;
and substituting the humidity and the flow of the EGR gas entering the air inlet pipeline and the humidity and the flow of the air entering the air inlet pipeline into a third preset formula to determine the humidity of the mixed gas in the air inlet pipeline.
8. The method of claim 7, wherein substituting the EGR gas humidity and flow rate into the intake line and the air humidity and flow rate into the intake line into a third predetermined formula to determine the humidity of the mixture in the intake line comprises:
Substituting the humidity and the flow of the EGR gas entering the air inlet pipeline and the humidity and the flow of the air entering the air inlet pipeline into the following third preset formula to determine the humidity of the mixed gas in the air inlet pipeline:
Wherein, Humidity of the mixed gas: /(I)Is the humidity of the EGR gas; /(I)V 1 is the EGR gas flow, which is the humidity of air; v 2 is the air flow into the intake line.
9. The method according to claim 1, wherein the increasing the temperature of the mixture gas to be higher than the condensation temperature by increasing the temperature of the EGR gas includes:
Reducing the opening degree of an EGR (exhaust gas Recirculation) cooling liquid control valve according to a preset step length, and acquiring the temperature of mixed gas in an air inlet pipeline of an EGR system, wherein the smaller the opening degree of the EGR cooling liquid control valve is, the higher the temperature of the EGR gas in the mixed gas is;
and stopping reducing the opening degree of the EGR cooling liquid control valve when the temperature of the mixed gas in the air inlet pipeline of the EGR system rises above the condensation temperature.
10. The method of claim 7, wherein the humidity of the EGR gas entering the intake line is calculated by:
determining the fuel quantity in unit time of the engine;
Determining the water content of EGR gas entering an air inlet pipeline according to the fuel quantity and the air water content of the engine;
and determining the humidity of the EGR gas entering the air inlet pipeline according to the water content of the EGR gas.
11. A temperature control device for performing the method of claims 1-9, comprising:
a turbocharger for discharging at least part of the exhaust gases from the engine into the EGR cooler;
an EGR cooler connected to the turbocharger for performing a cooling operation on EGR gas received from the turbocharger and sending the EGR gas into an intake line;
An EGR valve for adjusting the flow rate of EGR gas fed from the EGR cooler into the intake pipe;
The air inlet pipeline is used for receiving the EGR gas sent by the EGR cooler and air in the external environment and sending mixed gas consisting of the EGR gas and the air in the external environment into a compressor of the turbocharger;
An engine connected to the EGR cooler for delivering coolant to the EGR cooler;
An EGR coolant control valve is disposed between the engine and the EGR cooler for controlling a flow of coolant delivered to the EGR cooler.
12. A temperature control system, comprising:
At least one processor; and
A memory communicatively coupled to the at least one processor; wherein,
The memory stores instructions executable by the at least one processor to implement the temperature control method of any one of claims 1-10.
13. A computer readable storage medium, characterized in that instructions in the storage medium, when executed by a processor corresponding to a temperature control system, enable the temperature control system to implement the temperature control method according to any one of claims 1-10.
14. A vehicle, characterized by comprising:
The temperature control apparatus of claim 11;
Or alternatively
The temperature control system of claim 12.
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