CN112682189B - EGR valve control method and device and electronic equipment - Google Patents
EGR valve control method and device and electronic equipment Download PDFInfo
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- CN112682189B CN112682189B CN202011566229.3A CN202011566229A CN112682189B CN 112682189 B CN112682189 B CN 112682189B CN 202011566229 A CN202011566229 A CN 202011566229A CN 112682189 B CN112682189 B CN 112682189B
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Abstract
The invention provides an EGR valve control method, a device and electronic equipment, wherein in the invention, the current absolute humidity value and the maximum absolute humidity value of each easy-condensation position are calculated, then the target easy-condensation position with condensed water is determined by judging whether the current absolute humidity value is not smaller than the maximum absolute humidity value, the opening of an EGR valve is regulated by a valve opening regulating strategy corresponding to the target easy-condensation position, the flow of exhaust gas passing through the EGR valve is reduced, the condensed water generated by the exhaust gas is reduced, thereby reducing the condensation risk, reducing the influence of condensation on vehicle devices and improving the reliability of the vehicle devices.
Description
Technical Field
The present invention relates to the field of low-pressure EGR, and more particularly, to an EGR valve control method, apparatus, and electronic device.
Background
Exhaust Gas Recirculation (EGR) technology introduces Exhaust Gas discharged from an internal combustion engine into the engine to participate in combustion again, and plays a role in reducing oxygen concentration and combustion temperature, thereby reducing the generation of nitrogen oxides. The existing EGR technology is mainly divided into a high-pressure EGR technology and a low-pressure EGR technology, and the low-pressure EGR technology generally takes exhaust gas from the diesel particulate filter DPF (Diesel Particulate Filter), and the exhaust gas is mixed with fresh intake air before the exhaust gas returns to the compressor of the turbocharger through an EGR cooler, an EGR valve and the like.
The high-temperature waste gas needs to be cooled by the low-pressure EGR cooler, if the temperature is too low after cooling, the waste gas is condensed to separate out liquid water, the waste gas after low-pressure EGR cooling is mixed with fresh air inlet, the temperature is reduced again, and the liquid water is possibly condensed in the mixed gas, so that condensed water is contained in the gas before entering the compressor of the turbocharger, and the liquid water solution can impact an impeller rotating at high speed in the turbocharger to influence the performance of the impeller and even break of the impeller and influence the reliability of the turbocharger. Further, the waste gas contains elements such as nitrogen, sulfur and the like, and an acidic solution can be generated after the waste gas is dissolved in water, so that an air inlet pipeline of an engine is corroded, the service performance of the engine is influenced, and the service life of the engine is shortened.
Disclosure of Invention
In view of the above, the present invention provides an EGR valve control method, apparatus, and electronic device to solve the problem that condensed water at different vehicle positions may reduce the reliability of vehicle devices.
In order to solve the technical problems, the invention adopts the following technical scheme:
an EGR valve control method comprising:
acquiring environmental parameters of each easy-condensation position, and calculating the current absolute humidity value and the maximum absolute humidity value of the easy-condensation position based on the environmental parameters of the easy-condensation position;
Judging whether a target easy-condensation position with the current absolute humidity value not smaller than the maximum absolute humidity value exists or not;
if the target position is in the condensation position, acquiring a valve opening adjustment strategy corresponding to the target position easy to condense, and adjusting the opening of the EGR valve based on the valve opening adjustment strategy; the valve opening adjustment strategy includes an adjustment manner that reduces the EGR valve opening.
Optionally, the easy condensing position includes an EGR cooled position; based on the environmental parameters of the easy-to-condense position, calculating the current absolute humidity value and the maximum absolute humidity value of the easy-to-condense position, including:
acquiring an air inlet parameter of fresh air, and calculating to obtain a current absolute humidity value of the fresh air according to the air inlet parameter;
according to the fuel combustion process data, calculating to obtain a first water amount generated by fuel combustion;
calculating to obtain a second water quantity generated by urea injection according to urea injection process data;
calculating a current absolute humidity value of the position after EGR cooling according to the current absolute humidity value of the fresh air, the air inlet parameter of the fresh air, the first water quantity, the second water quantity and the fuel combustion process data;
And calculating the maximum absolute humidity value of the position after the EGR cooling based on the pressure value and the temperature value of the position after the EGR cooling.
Optionally, when the target position easy to condense is the position after EGR cooling, acquiring a valve opening adjustment policy corresponding to the target position easy to condense, and adjusting an opening of an EGR valve based on the valve opening adjustment policy, including:
acquiring a valve opening adjustment strategy corresponding to the cooled position of the EGR; the valve opening adjustment strategy includes closing the EGR valve;
and outputting a control command for closing the EGR valve to the EGR valve so as to enable the EGR valve to be closed.
Optionally, the condensation prone position comprises a pre-compressor position of a turbocharger; based on the environmental parameters of the easy-to-condense position, calculating the current absolute humidity value and the maximum absolute humidity value of the easy-to-condense position, including:
calculating to obtain the current absolute humidity value of the front position of the air compressor according to the current absolute humidity value of fresh air, the air inlet parameter of the fresh air, the current absolute humidity value of the position after EGR cooling and the exhaust gas mass flow value of the position after EGR cooling;
and calculating the maximum absolute humidity value of the front position of the compressor based on the pressure value and the temperature value of the front position of the compressor.
Optionally, when the easy-condensation position is the pre-compressor position, acquiring a valve opening adjustment strategy corresponding to the target easy-condensation position, and adjusting the opening of the EGR valve based on the valve opening adjustment strategy, including:
acquiring a valve opening adjustment strategy of the front position of the air compressor; the valve opening adjustment strategy includes adjusting an opening of the EGR valve so that a mass flow rate of EGR exhaust gas flowing through the EGR valve after the opening adjustment is the same as a maximum mass flow rate of the EGR valve calculated based on a maximum absolute humidity value of a position before the compressor;
calculating the maximum mass flow of the EGR valve based on the maximum absolute humidity value;
an EGR valve control command is output for adjusting an opening degree of the EGR valve such that a mass flow rate of EGR exhaust gas flowing through the EGR valve is the same as a maximum mass flow rate of the EGR valve.
Optionally, the easy condensing location comprises a post intercooler location; based on the environmental parameters of the easy-to-condense position, calculating the current absolute humidity value and the maximum absolute humidity value of the easy-to-condense position, including:
calculating to obtain the current absolute humidity value of the rear position of the intercooler based on the environmental parameters of the position easy to condense;
And calculating the maximum absolute humidity value of the position behind the intercooler based on the pressure value and the temperature value of the position behind the intercooler.
Optionally, when the easy-condensation position is the intercooler rear position, acquiring a valve opening adjustment strategy corresponding to the target easy-condensation position, and adjusting the opening of the EGR valve based on the valve opening adjustment strategy, including:
acquiring a valve opening adjustment strategy of the rear position of the intercooler; the valve opening adjustment strategy comprises the steps of adjusting the opening of the EGR valve so that the mass flow of EGR exhaust gas flowing through the EGR valve after the opening adjustment is the same as the maximum mass flow of the EGR valve calculated based on the maximum absolute humidity value of the position behind the intercooler;
calculating the maximum mass flow of the EGR valve based on the maximum absolute humidity value;
an EGR valve control command is output for adjusting an opening degree of the EGR valve such that a mass flow rate of EGR exhaust gas flowing through the EGR valve is the same as a maximum mass flow rate of the EGR valve.
An EGR valve control device comprising:
the data calculation module is used for acquiring the environmental parameters of each easy-condensing position and calculating the current absolute humidity value and the maximum absolute humidity value of the easy-condensing position based on the environmental parameters of the easy-condensing position;
The position judging module is used for judging whether a target easy-condensation position with the current absolute humidity value not smaller than the maximum absolute humidity value exists or not;
the valve adjusting module is used for acquiring a valve opening adjusting strategy corresponding to the target easy-to-condense position if the valve opening adjusting strategy exists, and adjusting the opening of the EGR valve based on the valve opening adjusting strategy; the valve opening adjustment strategy includes an adjustment manner that reduces the EGR valve opening.
Optionally, the easy condensing position includes an EGR cooled position; the data calculation module includes:
the first calculation sub-module is used for acquiring an air inlet parameter of fresh air and calculating to obtain a current absolute humidity value of the fresh air according to the air inlet parameter;
the second calculation sub-module is used for calculating and obtaining a first water amount generated by fuel combustion according to the fuel combustion process data;
the third calculation sub-module is used for calculating and obtaining a second water quantity generated by urea injection according to the urea injection process data;
a fourth calculation sub-module for calculating a current absolute humidity value of the EGR cooled position according to the current absolute humidity value of the fresh air, an intake parameter of the fresh intake air, the first water amount, the second water amount, and the fuel combustion process data;
And a fifth calculation sub-module for calculating a maximum absolute humidity value of the EGR cooled position based on the pressure value and the temperature value of the EGR cooled position.
An electronic device, comprising: a memory and a processor;
wherein the memory is used for storing programs;
the processor invokes the program and is configured to:
acquiring environmental parameters of each easy-condensation position, and calculating the current absolute humidity value and the maximum absolute humidity value of the easy-condensation position based on the environmental parameters of the easy-condensation position;
judging whether a target easy-condensation position with the current absolute humidity value not smaller than the maximum absolute humidity value exists or not;
if the target position is in the condensation position, acquiring a valve opening adjustment strategy corresponding to the target position easy to condense, and adjusting the opening of the EGR valve based on the valve opening adjustment strategy; the valve opening adjustment strategy includes an adjustment manner that reduces the EGR valve opening.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an EGR valve control method, a device and electronic equipment, wherein in the invention, the current absolute humidity value and the maximum absolute humidity value of each easy-condensation position are calculated, then the target easy-condensation position with condensed water is determined by judging whether the current absolute humidity value is not smaller than the maximum absolute humidity value, the opening of an EGR valve is regulated by a valve opening regulating strategy corresponding to the target easy-condensation position, the flow of exhaust gas passing through the EGR valve is reduced, the condensed water generated by the exhaust gas is reduced, thereby reducing the condensation risk, reducing the influence of condensation on vehicle devices and improving the reliability of the vehicle devices.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a low pressure EGR protection control system according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for controlling an EGR valve according to an embodiment of the present invention;
FIG. 3 is a flow chart of another method for controlling an EGR valve according to an embodiment of the present invention;
FIG. 4 is a method flow diagram of yet another EGR valve control method provided by an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an EGR valve control device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The existing main technologies for effectively reducing nitrogen oxides of an internal combustion engine are SCR and EGR technologies, and the EGR technology introduces exhaust gas discharged from the internal combustion engine into the engine to participate in combustion again, so that the effect of reducing oxygen concentration and combustion temperature is achieved, and the generation of nitrogen oxides is reduced. The existing EGR technology is mainly divided into a high-pressure EGR technology and a low-pressure EGR technology, wherein the high-pressure EGR technology takes waste gas from the front of a turbine of an engine supercharger, and the waste gas returns to an air inlet pipe of the engine through an EGR cooler, an EGR valve and other parts and is mixed with intake air; the low pressure EGR technology generally extracts exhaust gas from after-treatment after an engine supercharger turbine, and the exhaust gas is mixed with fresh intake air after passing through an EGR cooler, an EGR valve, and the like and returning to an engine compressor.
In order that the low-pressure EGR technique can be more clearly understood by those skilled in the art, the low-pressure EGR technique will now be explained with reference to the device connection relationship in fig. 1.
The devices corresponding to the respective identifiers in fig. 1 are:
1: a temperature-humidity-pressure sensor; 2: a low pressure EGR cooled temperature pressure sensor; 3: a low pressure EGR valve; 4: a low pressure EGR cooler; 5: an intercooler; 6: a post-intercooling temperature pressure sensor; 7: an intake throttle valve; 8: a high pressure EGR valve; 9: a high pressure EGR cooler; 10: the engine signal acquisition module; 11: a turbocharger; 12: a post-treatment tank; 13: an exhaust throttle valve; 14: an Electronic Control Unit (ECU).
Fig. 1 discloses a low pressure EGR protection control system. Specifically, a temperature-humidity-pressure sensor 1 for measuring the temperature, relative humidity, and pressure of fresh air is arranged on the fresh air intake side. Fresh air and low-pressure EGR exhaust gas are mixed before a compressor of the turbocharger 11, the mixed gas is pressurized by the turbocharger 11 and then is cooled by the intercooler 5, an intercooling temperature pressure sensor 6 is arranged behind the intercooler 5, and the mixed gas is mixed with high-pressure EGR exhaust gas through an air inlet throttle valve 7 and enters the engine. The high-pressure EGR takes gas from the pre-vortex exhaust pipe, and enters the intake pipe through the high-pressure EGR cooler 9 and the high-pressure EGR valve 8. The exhaust gas passes through the turbine of the turbocharger 11, through the post-treatment tank 12, and then through the exhaust throttle valve 13 to the atmosphere.
The low-pressure EGR is taken from the aftertreatment tank 12, and exhaust gas is generally taken from the DPF in the aftertreatment tank 12, and is mixed with fresh air through the low-pressure EGR cooler 4, the low-pressure EGR valve 3, and the low-pressure EGR cooled temperature pressure sensor 2. An Electronic Control Unit (ECU) 14 of the engine is electrically connected with the engine signal acquisition modules 10 and 1, 2 and 6, wherein the engine signal acquisition modules 10 provide information such as the rotating speed of the engine operation, the oil injection quantity and the like. And an Electronic Control Unit (ECU) 14 is electrically connected to the various valve types 3, 7, 8, 13, etc., for controlling the opening degrees of these valve types.
The low-pressure EGR cooler 4, the low-pressure EGR valve 3, and the low-pressure EGR cooled temperature/pressure sensor 2 in fig. 1 are the low-pressure EGR in the present embodiment, and the corresponding exhaust throttle valve 13 is a component that assists the low-pressure EGR. In order to realize condensation control in the present invention, a temperature-humidity-pressure sensor 1 is newly added in the present embodiment.
In practical applications, the fuel contains a large amount of hydrogen (H) element, which is combusted to produce water, and when the temperature is reduced, the gaseous water condenses to separate out liquid water. The low-pressure EGR system has a higher water content than the EGR system without the low-pressure EGR system, and therefore the risk of precipitation and condensation is also high. The inventor finds that the main precipitation positions of condensed water are after low-pressure EGR is cooled, before a compressor of a turbocharger and after an intercooler.
For low-pressure EGR, the high-temperature exhaust gas needs to be cooled by the low-pressure EGR cooler 4, and if the temperature is too low after cooling, the exhaust gas is condensed to separate out liquid water; the exhaust gas after low-pressure EGR cooling is mixed with fresh intake air, the temperature is reduced again, and it is also possible to condense liquid water in the mixture. All the above conditions can cause condensed water to be contained in the gas before entering the compressor of the turbocharger 11, and the turbocharger 11 is provided with an impeller rotating at a high speed, so that the liquid aqueous solution can impact the impeller, and the performance and even the reliability are affected by rupture. Moreover, the waste gas contains elements such as nitrogen, sulfur and the like, and acidic solution can be generated after the waste gas is dissolved in water, so that an air inlet pipeline is corroded, and further adverse effects are generated on an engine. Moreover, liquid water entering the engine is liable to cause rusting of engine parts, which affects the service life of the engine. Moreover, in cold areas, liquid water can become solid ice, so that the impeller of the supercharger can be adhered to ice of the shell, damage can be caused by adhesion or ice particle impact when the engine is started again, and the effective flow area of the air inlet pipeline is reduced due to the fact that an ice layer is generated, so that the engine is difficult to start.
In addition, the temperature of the mixed air is reduced after the mixed air passes through the intercooler, and condensed water is easy to generate after the air is intercooled due to the increase of the air pressure. There is also a risk of corrosion of the acidic solution and clogging by ice.
In order to solve the above problem of condensed water after low-pressure EGR cooling, before the compressor of the turbocharger and after the intercooler, the inventors have found that if the absolute humidity values at the three positions can be calculated and compared with the maximum absolute humidity value, if not less than the maximum absolute humidity value, it indicates that condensed water is precipitated at the position, at this time, the opening of the EGR valve is closed or reduced, the flow rate of exhaust gas is reduced, the source of condensed water can be reduced, the possibility of condensation is further reduced, and the engine, impeller and other components are protected.
Specifically, on the basis of the foregoing, an embodiment of the present invention provides an EGR valve control method, referring to fig. 2, may include:
s11, acquiring the environmental parameters of each easy-condensation position, and calculating the current absolute humidity value and the maximum absolute humidity value of the easy-condensation position based on the environmental parameters of the easy-condensation position.
In practical applications, the easy-to-condense position in the present embodiment may be the low-pressure EGR cold post-position, the turbocharger pre-compressor position, and the intercooler post-position described above.
The environment parameters of the easy-condensing position can be parameters such as temperature, relative humidity or pressure signals, and when the easy-condensing position is cooled by the low-pressure EGR, the temperature and the pressure can be detected by a low-pressure EGR cooled temperature pressure sensor.
When the position where the temperature is easy to condense is in front of the compressor of the turbocharger, a temperature, relative humidity or pressure signal can be detected by the temperature, humidity or pressure sensor 1.
When the position easy to condense is after the intercooler, the temperature and the pressure can be detected by the temperature and pressure sensor 6 after the intercooler.
In practical application, the calculation processes of the current absolute humidity value and the maximum absolute humidity value corresponding to different easily-condensed positions are different, and are described below.
1. When the low-pressure EGR is cooled at the condensation site, referring to fig. 2, step S11 may include:
s21, acquiring an air inlet parameter of fresh air, and calculating to obtain a current absolute humidity value of the fresh air according to the air inlet parameter.
In practical application, the temperature, relative humidity and pressure signals of the fresh air intake can be obtained by using the temperature, relative humidity and pressure sensor 1, and in addition, the fresh air intake main can be obtained by using the electronic control unit ECU, and the temperature, relative humidity and pressure signals of the fresh air intake and the fresh air intake m can be obtained air In this embodiment referred to as the intake parameter of fresh intake air.
The position of the temperature-humidity-pressure sensor 1 is an A state point, and the absolute humidity of the A point can be obtained by using a formula 1, wherein H A Absolute humidity at point A, P A The absolute pressure of the point A is the pressure signal detected by the temperature and humidity pressure sensor 1, R A Relative humidity at point A, P a The saturated vapor pressure at point a can be obtained by using a temperature lookup table in relation to the temperature at point a obtained by the temperature-humidity pressure sensor 1.
The absolute humidity and mass flow of the point A can be used for obtaining the mass of water in the gas.
S22, calculating to obtain a first water amount generated by fuel combustion according to fuel combustion process data;
s23, calculating to obtain a second water amount generated by urea injection according to urea injection process data;
s24, calculating to obtain the current absolute humidity value of the position of the cooled EGR according to the current absolute humidity value of the fresh air, the air inlet parameter of the fresh air, the first water quantity, the second water quantity and the urea injection process data.
Specifically, the water in the exhaust gas mainly comprises water contained in the air intake, water with increased fuel combustion and urea injection, and the water contained in the air intake can pass through absolute humidity H A And fresh air intake amount m air (provided by the ECU).
The water produced by combustion of the fuel (referred to as the first water amount) can be utilized as the mass ratio C of the hydrogen element in the fuel H (calibration constant), injection quantity m fuel And the mass ratio r of water to hydrogen H (constant) was obtained.
The urea-injected water (referred to as the second water quantity) may be injected by the urea injection quantity m urea (ECU provides) and Urea concentration C urea (constant) was obtained.
In the above manner, the water contained in the intake air, the fuel combustion, and the water with increased urea injection are calculated, and then the current absolute humidity value of the post-EGR-cooling position B (the state point at the low-pressure post-EGR-cooling temperature pressure sensor 2) can be calculated based on the water contained in the intake air, the fuel combustion, and the water with increased urea injection, as shown in the formula 2.
S25, calculating the maximum absolute humidity value of the position after the EGR cooling based on the pressure value and the temperature value of the position after the EGR cooling.
Specifically, the maximum absolute humidity value of the point B can be calculated by using the formula 3H B_LPEGRMAX ，P B The pressure value of the position after the cooling of the EGR is provided by the low-pressure temperature and pressure sensor 2 after the cooling of the EGR, and the saturated vapor pressure P of the position after the cooling of the EGR b And the temperature value of the position B point after the cooling of the EGR is related, the temperature is provided according to the temperature and pressure sensor 2 after the cooling of the low-pressure EGR, and then the temperature is obtained by looking up a table.
2. When the condensation-prone position is a pre-compressor position of the turbocharger, step S11 may include:
1) And calculating to obtain the current absolute humidity value of the front position of the air compressor according to the current absolute humidity value of the fresh air, the air inlet parameter of the fresh air, the current absolute humidity value of the position after the EGR is cooled and the exhaust gas mass flow value of the position after the EGR is cooled.
Specifically, the low-pressure EGR is mixed with fresh intake air and then enters the compressor of the turbocharger 11, and the temperature of the exhaust gas of the low-pressure EGR is reduced again, so that condensed water is easily condensed and separated out.
At this time, the low-pressure EGR flow rate m provided by the warm-wet pressure sensor 1, the low-pressure EGR after-cooling temperature-pressure sensor 3, and the ECU is utilized LPEGR And fresh air intake amount m air The mixed temperature C point temperature T of the front position of the compressor can be calculated C And absolute humidity value H C (wherein, the mixed low-pressure EGR and the inlet of the compressor are at the C state point), T C H as shown in equation 4 C As shown in equation 5.
Wherein T is B_LPEGR A temperature value detected by the low-pressure EGR cooled temperature/pressure sensor 3; t (T) A For detecting the temperature, humidity and pressure sensor 1Temperature value of fresh intake air. H A For the current absolute humidity value of fresh charge, m air Fresh air intake amount H in the intake parameters of fresh air B_LPEGR For the current absolute humidity value, m, of the EGR cooled position LPEGR Is the exhaust gas mass flow value at the position after the EGR is cooled.
2) And calculating the maximum absolute humidity value of the front position of the compressor based on the pressure value and the temperature value of the front position of the compressor.
Wherein, the maximum absolute humidity value H of the front position of the air compressor C_MAX The calculation formula is formula 6, wherein the temperature value of the front position of the compressor is the mixed temperature T of the front position of the compressor C According to the temperature, the saturated vapor pressure Pc can be obtained by looking up a table, and the pressure value P at the front position of the compressor BC Can be detected by the temperature-humidity-pressure sensor 1.
3. When the condensation-prone position is a post-intercooler position, step S11 may include:
and calculating the current absolute humidity value of the rear position of the intercooler according to the environmental parameters of the rear position of the intercooler, and calculating the maximum absolute humidity value of the rear position of the intercooler based on the pressure value and the temperature value of the rear position of the intercooler.
Specifically, the temperature of the mixed air is reduced after the mixed air passes through the intercooler, and the pressure of the air is increased due to the action of the supercharger, so that condensed water can be generated after the mixed air is intercooled.
The gas state behind the intercooler and in front of the air inlet throttle valve is the D state point. If no condensed water is separated out at the position B of the cooled EGR and the position C of the front compressor of the turbocharger, the absolute humidity H of the cooled EGR D And H C Equal.
The pressure value and the temperature value of the position behind the intercooler can be detected by using the temperature and pressure sensor 6. And calculating the maximum absolute humidity value of the post-intercooler D by using a formula 7.
Wherein P is D Is the pressure measured by the after-cold temperature and pressure sensor 6, and Pd is the saturated oxygen partial pressure obtained by looking up the temperature measured by the after-cold temperature and pressure sensor 6.
After determining the inter-cooling absolute humidity H D And H C After equality, the maximum low pressure EGR flow m for after-charge condensation can be obtained using equations 5 and 7 LPEGRMAX2 See formula 8.
S12, judging whether a target easy-condensation position with the current absolute humidity value not smaller than the maximum absolute humidity value exists or not; if yes, executing step S13; if not, ending.
In practical application, when the current absolute humidity value is not less than the current allowable maximum absolute humidity value, a condensation phenomenon occurs, so that it is required to determine whether condensation occurs in each easy-condensation position, that is, determine whether the current absolute humidity value of each easy-condensation position is not less than the maximum absolute humidity value, if not, it is indicated that the condensation phenomenon occurs in the easy-condensation position, and at this time, the easy-condensation position is referred to as a target easy-condensation position.
More specifically, the flow direction of the condensed water is:
The low-pressure EGR after-cooling position, the compressor front position of the turbocharger, and the intercooler rear position, so that the determination as to whether or not the condensation phenomenon occurs can be made in this order.
Whether the condensation phenomenon appears in different positions is independent, for example, the condensation of the position after the low-pressure EGR is cooled judges that the condensation does not appear, but the position after the intercooler is pressurized by the supercharger, the pressure is high, the condensation is easy to generate, and the condensation can be judged at the position.
And for any position easy to condense, condensation judgment is needed according to the corresponding mode, and after condensation judgment, the condensation is adjusted according to a corresponding condensation treatment strategy, namely a valve opening adjustment strategy.
And S13, acquiring a valve opening adjustment strategy corresponding to the target easy-condensation position, and adjusting the opening of the EGR valve based on the valve opening adjustment strategy.
In practical application, for different easy-condensation positions, the corresponding valve opening adjustment strategies are different, but based on a unified principle, the opening of the EGR valve is reduced, that is, the valve opening adjustment strategy comprises an adjustment mode for reducing the opening of the EGR valve.
For the above three condensed positions, the description will be given.
1. In the case where the target condensation-prone position is the EGR cooled position, step S13 may include:
acquiring a valve opening adjustment strategy corresponding to the cooled position of the EGR; the valve opening adjustment strategy includes closing the EGR valve, outputting a control command to the EGR valve to close the EGR valve.
Specifically, the current absolute humidity value H at the position after EGR cooling B_LPEGR Greater than or equal to the maximum absolute humidity value H B_LPEGRMAX Condensate water has been shown to precipitate and the low pressure EGR valve is controlled to close in order to protect the low pressure EGR and the intake line.
2. In the case where the condensation-prone position is the pre-compressor position, referring to fig. 4, step S13 may include:
s31, acquiring a valve opening adjustment strategy of the front position of the air compressor.
In practical applications, the valve opening adjustment strategy includes adjusting the opening of the EGR valve so that the mass flow rate of the EGR exhaust gas flowing through the EGR valve after the opening adjustment is the same as the maximum mass flow rate of the EGR valve calculated based on the maximum absolute humidity value of the compressor front position.
And S32, calculating the maximum mass flow of the EGR valve based on the maximum absolute humidity value.
In practical use, the EGR valveMaximum mass flow m LPEGRMAX1 The calculation formula is as follows:
and S33, outputting an EGR valve control instruction, wherein the EGR valve control instruction is used for adjusting the opening degree of the EGR valve so that the mass flow rate of the EGR exhaust gas flowing through the EGR valve is the same as the maximum mass flow rate of the EGR valve.
Specifically, if the current mass flow m through the EGR valve LPEGR Greater than m LPEGRMAX1 Then use m LPEGRMAX1 As a limit value of the low-pressure EGR flow rate, participating in control of the low-pressure EGR, the low-pressure EGR valve opening degree is reduced so that the low-pressure EGR flow rate is equal to m LPEGRMAX1 The opening degree of the EGR valve is reduced, excessive moisture entering from the low-pressure EGR system is reduced, and the condensation risk of the low-pressure EGR system is reduced, so that the engine is protected.
3. In the case where the condensation-prone position is the intercooler rear position, step S13 may include:
1) Acquiring a valve opening adjustment strategy of the rear position of the intercooler; the valve opening adjustment strategy comprises the steps of adjusting the opening of the EGR valve so that the mass flow of EGR exhaust gas flowing through the EGR valve after the opening adjustment is the same as the maximum mass flow of the EGR valve calculated based on the maximum absolute humidity value of the position behind the intercooler;
2) Calculating the maximum mass flow of the EGR valve based on the maximum absolute humidity value;
3) An EGR valve control command is output for adjusting an opening degree of the EGR valve such that a mass flow rate of EGR exhaust gas flowing through the EGR valve is the same as a maximum mass flow rate of the EGR valve.
In particular, the control method is as in the case where the condensed position is the pre-compressor position.
If the current mass flow m through the EGR valve LPEGR Greater than m LPEGRMAX2 Then use m LPEGRMAX2 As low asLimiting value of the low-pressure EGR flow, participating in control of the low-pressure EGR, reducing the opening degree of the low-pressure EGR valve so that the low-pressure EGR flow is equal to m LPEGRMAX2 。
In this embodiment, the current absolute humidity value and the maximum absolute humidity value of each easy-condensation position are calculated, then the target easy-condensation position where condensed water exists is determined by judging whether the current absolute humidity value is not less than the maximum absolute humidity value, the opening of the EGR valve is adjusted by the valve opening adjustment strategy corresponding to the target easy-condensation position, the flow of exhaust gas passing through the EGR valve is reduced, and then the condensed water generated by the exhaust gas is reduced, so that the condensation risk is reduced, the influence of condensation on vehicle devices is reduced, and the reliability of the vehicle devices is improved.
In addition, the method can effectively avoid the generation of condensed water, avoid the impact of the impeller, influence the performance and even the reliability due to rupture; or the liquid water is prevented from being changed into solid ice in a cold region, the impeller of the supercharger is adhered to the shell ice, damage is caused by adhesion or ice particle impact when the engine is started again, the effective flow area of the air inlet pipeline is reduced due to the ice layer, and the engine is difficult to start; and the waste gas is prevented from containing elements such as nitrogen, sulfur and the like, and acid solution can be generated after the waste gas is dissolved in water, so that an air inlet pipeline is corroded, and further adverse effects are generated on an engine. And can also prevent the adverse effects of condensed water, corrosion, icing blockage, rust and the like after intercooling. Thereby protecting engine components, improving the reliability of the engine and prolonging the service life of the engine.
Optionally, on the basis of the embodiment of the EGR valve control method described above, another embodiment of the present invention provides an EGR valve control device, characterized by comprising:
the data calculation module 11 is configured to obtain an environmental parameter of each easy-condensation position, and calculate a current absolute humidity value and a maximum absolute humidity value of the easy-condensation position based on the environmental parameter of the easy-condensation position;
the position determination module 12, the target condensing position is used for judging whether the current absolute humidity value is not smaller than the maximum absolute humidity value;
a valve adjusting module 13, configured to obtain a valve opening adjustment strategy corresponding to the target condensation-prone position if the target condensation-prone position exists, and adjusting the opening of the EGR valve based on the valve opening adjustment strategy; the valve opening adjustment strategy includes an adjustment manner that reduces the EGR valve opening.
Further, the easy condensing position includes an EGR cooled position; the data calculation the module comprises:
the first calculation sub-module is used for acquiring an air inlet parameter of fresh air and calculating to obtain a current absolute humidity value of the fresh air according to the air inlet parameter;
the second calculation sub-module is used for calculating and obtaining a first water amount generated by fuel combustion according to the fuel combustion process data;
The third calculation sub-module is used for calculating and obtaining a second water quantity generated by urea injection according to the urea injection process data;
a fourth calculation sub-module for calculating a current absolute humidity value of the EGR cooled position according to the current absolute humidity value of the fresh air, an intake parameter of the fresh intake air, the first water amount, the second water amount, and the fuel combustion process data;
and a fifth calculation sub-module for calculating a maximum absolute humidity value of the EGR cooled position based on the pressure value and the temperature value of the EGR cooled position.
Further, in the case where the target condensation-prone position is the EGR cooled position, the valve adjustment module is specifically configured to:
acquiring a valve opening adjustment strategy corresponding to the cooled position of the EGR; the valve opening adjustment strategy includes closing the EGR valve, outputting a control command to the EGR valve to close the EGR valve.
Further, the condensation prone position includes a pre-compressor position of the turbocharger; the data calculation module includes:
a sixth calculation sub-module, configured to calculate a current absolute humidity value of the front position of the compressor according to a current absolute humidity value of fresh intake air, an intake parameter of the fresh intake air, a current absolute humidity value of the cooled position of the EGR, and an exhaust gas mass flow value of the cooled position of the EGR;
And a seventh calculation sub-module for calculating a maximum absolute humidity value of the front position of the compressor based on the pressure value and the temperature value of the front position of the compressor.
Further, in the case where the condensation prone position is the compressor front position, the valve adjustment module includes:
the first strategy acquisition sub-module is used for acquiring a valve opening adjustment strategy of the front position of the compressor; the valve opening adjustment strategy includes adjusting an opening of the EGR valve so that a mass flow rate of EGR exhaust gas flowing through the EGR valve after the opening adjustment is the same as a maximum mass flow rate of the EGR valve calculated based on a maximum absolute humidity value of a position before the compressor;
the first flow rate operator module is used for calculating the maximum mass flow rate of the EGR valve based on the maximum absolute humidity value;
and the first adjusting sub-module is used for outputting an EGR valve control instruction, and the EGR valve control instruction is used for adjusting the opening degree of the EGR valve so that the mass flow rate of the EGR exhaust gas flowing through the EGR valve is the same as the maximum mass flow rate of the EGR valve.
Further, the easy condensing location includes a post intercooler location; the data calculation module includes:
And the eighth calculation sub-module is used for calculating and obtaining the current absolute humidity value of the position behind the intercooler based on the environmental parameter of the position easy to condense, and calculating the maximum absolute humidity value of the position behind the intercooler based on the pressure value and the temperature value of the position behind the intercooler.
Further, in the case where the condensation prone position is the intercooler rear position, the valve adjustment module includes:
the second strategy acquisition sub-module is used for acquiring a valve opening adjustment strategy of the rear position of the intercooler; the valve opening adjustment strategy comprises the steps of adjusting the opening of the EGR valve so that the mass flow of EGR exhaust gas flowing through the EGR valve after the opening adjustment is the same as the maximum mass flow of the EGR valve calculated based on the maximum absolute humidity value of the position behind the intercooler;
the second flow calculation operator module is used for calculating the maximum mass flow of the EGR valve based on the maximum absolute humidity value;
and a second adjustment sub-module for outputting an EGR valve control instruction for adjusting the opening degree of the EGR valve so that the mass flow rate of EGR exhaust gas flowing through the EGR valve is the same as the maximum mass flow rate of the EGR valve.
In this embodiment, the current absolute humidity value and the maximum absolute humidity value of each easy-condensation position are calculated, then the target easy-condensation position where condensed water exists is determined by judging whether the current absolute humidity value is not less than the maximum absolute humidity value, the opening of the EGR valve is adjusted by the valve opening adjustment strategy corresponding to the target easy-condensation position, the flow of exhaust gas passing through the EGR valve is reduced, and then the condensed water generated by the exhaust gas is reduced, so that the condensation risk is reduced, the influence of condensation on vehicle devices is reduced, and the reliability of the vehicle devices is improved.
In addition, the method can effectively avoid the generation of condensed water, avoid the impact of the impeller, influence the performance and even the reliability due to rupture; or the liquid water is prevented from being changed into solid ice in a cold region, the impeller of the supercharger is adhered to the shell ice, damage is caused by adhesion or ice particle impact when the engine is started again, the effective flow area of the air inlet pipeline is reduced due to the ice layer, and the engine is difficult to start; and the waste gas is prevented from containing elements such as nitrogen, sulfur and the like, and acid solution can be generated after the waste gas is dissolved in water, so that an air inlet pipeline is corroded, and further adverse effects are generated on an engine. And can also prevent the adverse effects of condensed water, corrosion, icing blockage, rust and the like after intercooling. Thereby protecting engine components, improving the reliability of the engine and prolonging the service life of the engine.
It should be noted that, in the working process of each module and sub-module in this embodiment, please refer to the corresponding description in the above embodiment, and the description is omitted here.
Optionally, on the basis of the embodiments of the method and the device for controlling an EGR valve, another embodiment of the present invention provides an electronic device, including: a memory and a processor;
wherein the memory is used for storing programs;
the processor invokes the program and is configured to:
acquiring environmental parameters of each easy-condensation position, and calculating the current absolute humidity value and the maximum absolute humidity value of the easy-condensation position based on the environmental parameters of the easy-condensation position;
judging whether a target easy-condensation position with the current absolute humidity value not smaller than the maximum absolute humidity value exists or not;
if the target position is in the condensation position, acquiring a valve opening adjustment strategy corresponding to the target position easy to condense, and adjusting the opening of the EGR valve based on the valve opening adjustment strategy; the valve opening adjustment strategy includes an adjustment manner that reduces the EGR valve opening.
Further, the easy condensing position includes an EGR cooled position; based on the environmental parameters of the easy-to-condense position, calculating the current absolute humidity value and the maximum absolute humidity value of the easy-to-condense position, including:
Acquiring an air inlet parameter of fresh air, and calculating to obtain a current absolute humidity value of the fresh air according to the air inlet parameter;
according to the fuel combustion process data, calculating to obtain a first water amount generated by fuel combustion;
calculating to obtain a second water quantity generated by urea injection according to urea injection process data;
calculating a current absolute humidity value of the position after EGR cooling according to the current absolute humidity value of the fresh air, the air inlet parameter of the fresh air, the first water quantity, the second water quantity and the fuel combustion process data;
and calculating the maximum absolute humidity value of the position after the EGR cooling based on the pressure value and the temperature value of the position after the EGR cooling.
Further, when the target easy-condensation position is the position after EGR cooling, acquiring a valve opening adjustment strategy corresponding to the target easy-condensation position, and adjusting the opening of the EGR valve based on the valve opening adjustment strategy, including:
acquiring a valve opening adjustment strategy corresponding to the cooled position of the EGR; the valve opening adjustment strategy includes closing the EGR valve;
and outputting a control command for closing the EGR valve to the EGR valve so as to enable the EGR valve to be closed.
Further, the condensation prone position includes a pre-compressor position of the turbocharger; based on the environmental parameters of the easy-to-condense position, calculating the current absolute humidity value and the maximum absolute humidity value of the easy-to-condense position, including:
calculating to obtain the current absolute humidity value of the front position of the air compressor according to the current absolute humidity value of fresh air, the air inlet parameter of the fresh air, the current absolute humidity value of the position after EGR cooling and the exhaust gas mass flow value of the position after EGR cooling;
and calculating the maximum absolute humidity value of the front position of the compressor based on the pressure value and the temperature value of the front position of the compressor.
Further, when the easy-condensation position is the compressor front position, acquiring a valve opening adjustment strategy corresponding to the target easy-condensation position, and adjusting the opening of the EGR valve based on the valve opening adjustment strategy, including:
acquiring a valve opening adjustment strategy of the front position of the air compressor; the valve opening adjustment strategy includes adjusting an opening of the EGR valve so that a mass flow rate of EGR exhaust gas flowing through the EGR valve after the opening adjustment is the same as a maximum mass flow rate of the EGR valve calculated based on a maximum absolute humidity value of a position before the compressor;
Calculating the maximum mass flow of the EGR valve based on the maximum absolute humidity value;
an EGR valve control command is output for adjusting an opening degree of the EGR valve such that a mass flow rate of EGR exhaust gas flowing through the EGR valve is the same as a maximum mass flow rate of the EGR valve.
Further, the easy condensing location includes a post intercooler location; based on the environmental parameters of the easy-to-condense position, calculating the current absolute humidity value and the maximum absolute humidity value of the easy-to-condense position, including:
calculating to obtain the current absolute humidity value of the rear position of the intercooler based on the environmental parameters of the position easy to condense;
and calculating the maximum absolute humidity value of the position behind the intercooler based on the pressure value and the temperature value of the position behind the intercooler.
Further, when the easy-condensation position is the intercooler rear position, acquiring a valve opening adjustment strategy corresponding to the target easy-condensation position, and adjusting the opening of the EGR valve based on the valve opening adjustment strategy, including:
acquiring a valve opening adjustment strategy of the rear position of the intercooler; the valve opening adjustment strategy comprises the steps of adjusting the opening of the EGR valve so that the mass flow of EGR exhaust gas flowing through the EGR valve after the opening adjustment is the same as the maximum mass flow of the EGR valve calculated based on the maximum absolute humidity value of the position behind the intercooler;
Calculating the maximum mass flow of the EGR valve based on the maximum absolute humidity value;
an EGR valve control command is output for adjusting an opening degree of the EGR valve such that a mass flow rate of EGR exhaust gas flowing through the EGR valve is the same as a maximum mass flow rate of the EGR valve.
In this embodiment, the current absolute humidity value and the maximum absolute humidity value of each easy-condensation position are calculated, then the target easy-condensation position where condensed water exists is determined by judging whether the current absolute humidity value is not less than the maximum absolute humidity value, the opening of the EGR valve is adjusted by the valve opening adjustment strategy corresponding to the target easy-condensation position, the flow of exhaust gas passing through the EGR valve is reduced, and then the condensed water generated by the exhaust gas is reduced, so that the condensation risk is reduced, the influence of condensation on vehicle devices is reduced, and the reliability of the vehicle devices is improved.
In addition, the method can effectively avoid the generation of condensed water, avoid the impact of the impeller, influence the performance and even the reliability due to rupture; or the liquid water is prevented from being changed into solid ice in a cold region, the impeller of the supercharger is adhered to the shell ice, damage is caused by adhesion or ice particle impact when the engine is started again, the effective flow area of the air inlet pipeline is reduced due to the ice layer, and the engine is difficult to start; and the waste gas is prevented from containing elements such as nitrogen, sulfur and the like, and acid solution can be generated after the waste gas is dissolved in water, so that an air inlet pipeline is corroded, and further adverse effects are generated on an engine. And can also prevent the adverse effects of condensed water, corrosion, icing blockage, rust and the like after intercooling. Thereby protecting engine components, improving the reliability of the engine and prolonging the service life of the engine.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. An EGR valve control method characterized by comprising:
acquiring environmental parameters of each easy-condensation position, and calculating the current absolute humidity value and the maximum absolute humidity value of the easy-condensation position based on the environmental parameters of the easy-condensation position;
the easy-to-condense location includes: a low pressure EGR cooler post-position, a turbocharger compressor front position, and an intercooler post-position;
if the easy-condensation position is a position behind the low-pressure EGR cooler, the calculating the current absolute humidity value and the maximum absolute humidity value of the easy-condensation position based on the environmental parameter of the easy-condensation position comprises:
Acquiring an air inlet parameter of fresh air inlet, and calculating to obtain a current absolute humidity value of the fresh air inlet according to the air inlet parameter;
according to the fuel combustion process data, calculating to obtain a first water amount generated by fuel combustion;
calculating to obtain a second water quantity generated by urea injection according to urea injection process data;
calculating to obtain the current absolute humidity value of the rear position of the low-pressure EGR cooler according to the current absolute humidity value of the fresh air intake, the air intake parameter of the fresh air intake, the first water quantity, the second water quantity and the fuel combustion process data;
calculating a maximum absolute humidity value of the low-pressure EGR cooler rear position based on the pressure value and the temperature value of the low-pressure EGR cooler rear position;
if the easy-condensation position is a pre-compressor position of the turbocharger, the calculating the current absolute humidity value and the maximum absolute humidity value of the easy-condensation position based on the environmental parameter of the easy-condensation position includes:
calculating to obtain the current absolute humidity value of the front position of the compressor according to the current absolute humidity value of fresh air, the air inlet parameter of the fresh air, the current absolute humidity value of the rear position of the low-pressure EGR cooler and the exhaust gas mass flow value of the rear position of the low-pressure EGR cooler;
Calculating the maximum absolute humidity value of the front position of the air compressor based on the pressure value and the temperature value of the front position of the air compressor;
if the easy-condensation position is a post-intercooler position, the calculating the current absolute humidity value and the maximum absolute humidity value of the easy-condensation position based on the environmental parameter of the easy-condensation position includes:
calculating to obtain the current absolute humidity value of the rear position of the intercooler based on the environmental parameters of the position easy to condense;
calculating the maximum absolute humidity value of the position behind the intercooler based on the pressure value and the temperature value of the position behind the intercooler;
judging whether a target easy-condensation position with the current absolute humidity value not smaller than the maximum absolute humidity value exists or not;
if the target position is in the condensation position, acquiring a valve opening adjustment strategy corresponding to the target position easy to condense, and adjusting the opening of the EGR valve based on the valve opening adjustment strategy; the valve opening adjustment strategy includes an adjustment manner that reduces the EGR valve opening.
2. The EGR valve control method according to claim 1, characterized in that, in the case where the target easy-to-condense position is the low-pressure EGR cooler post-position, acquiring a valve opening adjustment strategy corresponding to the target easy-to-condense position, and adjusting an opening of an EGR valve based on the valve opening adjustment strategy, comprising:
Acquiring a valve opening adjustment strategy corresponding to the rear position of the low-pressure EGR cooler; the valve opening adjustment strategy includes closing the EGR valve;
and outputting a control command for closing the EGR valve to the EGR valve so as to enable the EGR valve to be closed.
3. The EGR valve control method according to claim 1, wherein, in the case where the condensation-prone position is the compressor front position, acquiring a valve opening adjustment strategy corresponding to the target condensation-prone position, and adjusting an opening of an EGR valve based on the valve opening adjustment strategy, includes:
acquiring a valve opening adjustment strategy of the front position of the air compressor; the valve opening adjustment strategy includes adjusting an opening of the EGR valve so that a mass flow rate of EGR exhaust gas flowing through the EGR valve after the opening adjustment is the same as a maximum mass flow rate of the EGR valve calculated based on a maximum absolute humidity value of a position before the compressor;
calculating to obtain the maximum mass flow of the EGR valve based on the maximum absolute humidity value of the front position of the compressor;
an EGR valve control command is output for adjusting an opening degree of the EGR valve such that a mass flow rate of EGR exhaust gas flowing through the EGR valve is the same as a maximum mass flow rate of the EGR valve.
4. The EGR valve control method according to claim 1, characterized in that, in the case where the easy-to-condense position is the intercooler rear position, acquiring a valve opening adjustment strategy corresponding to the target easy-to-condense position, and adjusting an opening of an EGR valve based on the valve opening adjustment strategy, comprising:
acquiring a valve opening adjustment strategy of the rear position of the intercooler; the valve opening adjustment strategy comprises the steps of adjusting the opening of the EGR valve so that the mass flow of EGR exhaust gas flowing through the EGR valve after the opening adjustment is the same as the maximum mass flow of the EGR valve calculated based on the maximum absolute humidity value of the position behind the intercooler;
calculating to obtain the maximum mass flow of the EGR valve based on the maximum absolute humidity value of the rear position of the intercooler;
an EGR valve control command is output for adjusting an opening degree of the EGR valve such that a mass flow rate of EGR exhaust gas flowing through the EGR valve is the same as a maximum mass flow rate of the EGR valve.
5. An EGR valve control apparatus, characterized by comprising:
the data calculation module is used for acquiring the environmental parameters of each easy-condensing position and calculating the current absolute humidity value and the maximum absolute humidity value of the easy-condensing position based on the environmental parameters of the easy-condensing position;
The easy-to-condense location includes: a low pressure EGR cooler post-position, a turbocharger compressor front position, and an intercooler post-position;
the data calculation module is specifically configured to:
if the easy-condensation position is a position behind the low-pressure EGR cooler, the calculating the current absolute humidity value and the maximum absolute humidity value of the easy-condensation position based on the environmental parameter of the easy-condensation position comprises:
acquiring an air inlet parameter of fresh air inlet, and calculating to obtain a current absolute humidity value of the fresh air inlet according to the air inlet parameter;
according to the fuel combustion process data, calculating to obtain a first water amount generated by fuel combustion;
calculating to obtain a second water quantity generated by urea injection according to urea injection process data;
calculating to obtain the current absolute humidity value of the rear position of the low-pressure EGR cooler according to the current absolute humidity value of the fresh air intake, the air intake parameter of the fresh air intake, the first water quantity, the second water quantity and the fuel combustion process data;
calculating a maximum absolute humidity value of the low-pressure EGR cooler rear position based on the pressure value and the temperature value of the low-pressure EGR cooler rear position;
if the easy-condensation position is a pre-compressor position of the turbocharger, the calculating the current absolute humidity value and the maximum absolute humidity value of the easy-condensation position based on the environmental parameter of the easy-condensation position includes:
Calculating to obtain the current absolute humidity value of the front position of the compressor according to the current absolute humidity value of fresh air, the air inlet parameter of the fresh air, the current absolute humidity value of the rear position of the low-pressure EGR cooler and the exhaust gas mass flow value of the rear position of the low-pressure EGR cooler;
calculating the maximum absolute humidity value of the front position of the air compressor based on the pressure value and the temperature value of the front position of the air compressor;
if the easy-condensation position is a post-intercooler position, the calculating the current absolute humidity value and the maximum absolute humidity value of the easy-condensation position based on the environmental parameter of the easy-condensation position includes:
calculating to obtain the current absolute humidity value of the rear position of the intercooler based on the environmental parameters of the position easy to condense;
calculating the maximum absolute humidity value of the position behind the intercooler based on the pressure value and the temperature value of the position behind the intercooler; the position judging module is used for judging whether a target easy-condensation position with the current absolute humidity value not smaller than the maximum absolute humidity value exists or not;
the valve adjusting module is used for acquiring a valve opening adjusting strategy corresponding to the target easy-to-condense position if the valve opening adjusting strategy exists, and adjusting the opening of the EGR valve based on the valve opening adjusting strategy; the valve opening adjustment strategy includes an adjustment manner that reduces the EGR valve opening.
6. The EGR valve control device of claim 5, wherein the easy-to-condense position comprises a low-pressure EGR cooler post-position; the data calculation module includes:
the first calculation sub-module is used for obtaining air inlet parameters of fresh air inlet and calculating to obtain a current absolute humidity value of the fresh air inlet according to the air inlet parameters;
the second calculation sub-module is used for calculating and obtaining a first water amount generated by fuel combustion according to the fuel combustion process data;
the third calculation sub-module is used for calculating and obtaining a second water quantity generated by urea injection according to the urea injection process data;
a fourth calculation sub-module, configured to calculate a current absolute humidity value of a rear position of the low-pressure EGR cooler according to the current absolute humidity value of the fresh intake air, an intake parameter of the fresh intake air, the first water amount, the second water amount, and the fuel combustion process data;
and a fifth calculation sub-module for calculating a maximum absolute humidity value of the low-pressure EGR cooler post-position based on the pressure value and the temperature value of the low-pressure EGR cooler post-position.
7. An electronic device, comprising: a memory and a processor;
Wherein the memory is used for storing programs;
the processor invokes the program and is configured to:
acquiring environmental parameters of each easy-condensation position, and calculating the current absolute humidity value and the maximum absolute humidity value of the easy-condensation position based on the environmental parameters of the easy-condensation position;
the processor invokes a program and is specifically configured to: if the easy-condensation position is a position behind the low-pressure EGR cooler, the calculating the current absolute humidity value and the maximum absolute humidity value of the easy-condensation position based on the environmental parameter of the easy-condensation position comprises:
acquiring an air inlet parameter of fresh air inlet, and calculating to obtain a current absolute humidity value of the fresh air inlet according to the air inlet parameter;
according to the fuel combustion process data, calculating to obtain a first water amount generated by fuel combustion;
calculating to obtain a second water quantity generated by urea injection according to urea injection process data;
calculating to obtain the current absolute humidity value of the rear position of the low-pressure EGR cooler according to the current absolute humidity value of the fresh air intake, the air intake parameter of the fresh air intake, the first water quantity, the second water quantity and the fuel combustion process data;
calculating a maximum absolute humidity value of the low-pressure EGR cooler rear position based on the pressure value and the temperature value of the low-pressure EGR cooler rear position;
If the easy-condensation position is a pre-compressor position of the turbocharger, the calculating the current absolute humidity value and the maximum absolute humidity value of the easy-condensation position based on the environmental parameter of the easy-condensation position includes:
calculating to obtain the current absolute humidity value of the front position of the compressor according to the current absolute humidity value of fresh air, the air inlet parameter of the fresh air, the current absolute humidity value of the rear position of the low-pressure EGR cooler and the exhaust gas mass flow value of the rear position of the low-pressure EGR cooler;
calculating the maximum absolute humidity value of the front position of the air compressor based on the pressure value and the temperature value of the front position of the air compressor;
if the easy-condensation position is a post-intercooler position, the calculating the current absolute humidity value and the maximum absolute humidity value of the easy-condensation position based on the environmental parameter of the easy-condensation position includes:
calculating to obtain the current absolute humidity value of the rear position of the intercooler based on the environmental parameters of the position easy to condense;
calculating the maximum absolute humidity value of the position behind the intercooler based on the pressure value and the temperature value of the position behind the intercooler;
judging whether a target easy-condensation position with the current absolute humidity value not smaller than the maximum absolute humidity value exists or not;
If the target position is in the condensation position, acquiring a valve opening adjustment strategy corresponding to the target position easy to condense, and adjusting the opening of the EGR valve based on the valve opening adjustment strategy; the valve opening adjustment strategy includes an adjustment manner that reduces the EGR valve opening.
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| GB2505650A (en) * | 2012-09-05 | 2014-03-12 | Gm Global Tech Operations Inc | Method of controlling an engine including an exhaust gas recirculation system with a bypass circuit. |
| US9267423B2 (en) * | 2014-06-03 | 2016-02-23 | Ford Global Technologies, Llc | Methods and systems for increasing airflow through a charge air cooler to decrease charge air cooler condensate |
| KR101846886B1 (en) * | 2016-04-21 | 2018-05-24 | 현대자동차 주식회사 | Engine system and method thereof |
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