CN117145609A - Exhaust temperature adjusting method and device, electronic equipment and storage medium - Google Patents
Exhaust temperature adjusting method and device, electronic equipment and storage medium Download PDFInfo
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/0205—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using heat exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
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- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses an exhaust temperature adjusting method, an exhaust temperature adjusting device, electronic equipment and a storage medium, and relates to the technical field of engines, wherein the method comprises the following steps: acquiring matched expected exhaust manifold pressure and expected exhaust temperature according to the engine speed and the single-cycle fuel injection quantity of the engine; acquiring an actual exhaust manifold pressure according to the upstream pressure of the exhaust temperature management valve, the engine exhaust flow, the downstream temperature of the exhaust temperature management valve, the desired exhaust manifold pressure and the desired exhaust temperature; the opening degree of the exhaust temperature management valve is controlled according to the difference pressure between the desired exhaust manifold pressure and the actual exhaust manifold pressure to adjust the exhaust temperature by the opening degree of the exhaust temperature management valve. According to the technical scheme, exhaust temperature closed-loop control based on exhaust manifold pressure is realized, the actual exhaust manifold pressure is obtained through calculation, the adjustment precision of the exhaust temperature is greatly improved, and the influence of the engine working condition on the detection precision of the sensor is avoided.
Description
Technical Field
The present invention relates to the field of engine technologies, and in particular, to an exhaust gas temperature adjustment method, an exhaust gas temperature adjustment device, an electronic device, and a storage medium.
Background
The exhaust gas temperature is an important parameter of the engine, which affects not only the emission of harmful substances, but also the operation safety of engine components such as a combustion chamber, a turbine blade, a tail nozzle and the like, and therefore, the effective regulation of the exhaust gas temperature becomes an important component of the engine technology.
The existing exhaust temperature adjusting component comprises an air inlet throttle valve, a cylinder deactivation system, a late injection, an electric heating device, a burner and the like, and in the traditional technical scheme, the exhaust temperature of an engine is usually directly obtained according to a detection device such as a temperature sensor and the like for adjusting the exhaust temperature, and then the working parameters of the currently used exhaust temperature adjusting component are controlled according to the exhaust temperature, so that the exhaust temperature adjustment is realized.
However, in such an adjustment mode, the detection devices such as the temperature sensor are affected by the working condition of the engine, so that larger detection deviation often occurs, and the adjustment accuracy of the exhaust temperature is reduced.
Disclosure of Invention
The invention provides an exhaust temperature adjusting method, an exhaust temperature adjusting device, electronic equipment and a storage medium, and aims to solve the problem of low exhaust temperature adjusting precision.
According to an aspect of the present invention, there is provided an exhaust gas temperature adjustment method including:
acquiring matched expected exhaust manifold pressure and expected exhaust temperature according to the engine speed and the single-cycle fuel injection quantity of the engine;
acquiring an actual exhaust manifold pressure according to an upstream pressure of an exhaust temperature management valve, an engine exhaust flow, a downstream temperature of the exhaust temperature management valve, the desired exhaust manifold pressure and the desired exhaust temperature;
and obtaining a differential pressure according to the expected exhaust manifold pressure and the actual exhaust manifold pressure, and controlling the opening degree of the exhaust temperature management valve according to the differential pressure so as to adjust the exhaust temperature through the opening degree of the exhaust temperature management valve.
The step of obtaining the actual exhaust manifold pressure according to the upstream pressure of the exhaust temperature management valve, the engine exhaust flow, the downstream temperature of the exhaust temperature management valve, the expected exhaust manifold pressure and the expected exhaust temperature specifically includes: acquiring actual air inlet efficiency according to the air inlet manifold pressure, the engine rotating speed and the expected exhaust manifold pressure; and obtaining the exhaust flow of the engine according to the actual air inlet efficiency, the theoretical air inlet amount and the fuel flow. According to the obtained expected exhaust manifold pressure, the engine exhaust flow is obtained through the calculation mode, so that the calculation accuracy of the engine exhaust flow is greatly improved, the actual exhaust manifold pressure obtained based on the engine exhaust flow is further improved, and the accurate control of the exhaust temperature is ensured.
The step of obtaining the actual exhaust manifold pressure according to the upstream pressure of the exhaust temperature management valve, the engine exhaust flow, the downstream temperature of the exhaust temperature management valve, the expected exhaust manifold pressure and the expected exhaust temperature specifically includes: the upstream pressure of the exhaust temperature management valve is obtained from the downstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the opening degree of the exhaust temperature management valve, and the downstream temperature of the exhaust temperature management valve. The obtained upstream pressure of the exhaust temperature management valve is calculated through the mode, so that the influence of oscillation of upstream components such as a turbine, an exhaust manifold and a cylinder is reduced, and the numerical accuracy of the upstream pressure of the exhaust temperature management valve is improved.
The method for obtaining the upstream pressure of the exhaust temperature management valve according to the downstream pressure of the exhaust temperature management valve, the exhaust flow of the engine, the opening degree of the exhaust temperature management valve and the downstream temperature of the exhaust temperature management valve specifically comprises the following steps: the downstream pressure of the exhaust temperature management valve is obtained based on the barometric pressure, the engine exhaust flow, and the downstream temperature of the exhaust temperature management valve. The obtained downstream pressure of the exhaust temperature management valve is calculated in the mode, so that the influence of oscillation of upstream components such as a turbine, an exhaust manifold and a cylinder is further avoided, and the numerical accuracy of the downstream pressure of the exhaust temperature management valve is improved.
The step of obtaining the actual exhaust manifold pressure according to the upstream pressure of the exhaust temperature management valve, the engine exhaust flow, the downstream temperature of the exhaust temperature management valve, the expected exhaust manifold pressure and the expected exhaust temperature specifically includes: sequentially calculating actual intake efficiency, downstream pressure of an exhaust temperature management valve, upstream pressure of the exhaust temperature management valve, exhaust manifold pressure and exhaust gas charging efficiency; and continuously and sequentially calculating the actual air inlet efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure and the exhaust gas charging efficiency according to the current exhaust gas charging efficiency, and taking the current exhaust manifold pressure as the actual exhaust manifold pressure when the iteration times reach a preset iteration threshold. The actual exhaust manifold pressure is obtained through iterative calculation, the numerical influence of calculation errors of the engine exhaust flow on the actual exhaust manifold pressure is avoided, and the calculation accuracy of the actual exhaust manifold pressure is further improved.
After sequentially calculating the actual intake efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure, and the exhaust gas charge efficiency, it further includes: and continuously and sequentially calculating the actual air inlet efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure and the exhaust gas charging efficiency according to the current exhaust gas charging efficiency, and taking the current exhaust manifold pressure as the actual exhaust manifold pressure when the difference pressure between the current exhaust manifold pressure and the expected exhaust manifold pressure is smaller than or equal to a preset difference threshold value. Therefore, the iteration times are reduced, the operation complexity is reduced, and the acquisition efficiency of the actual exhaust manifold pressure is improved.
The obtaining the differential pressure according to the expected exhaust manifold pressure and the actual exhaust manifold pressure comprises the following steps: acquiring corrected expected exhaust manifold pressure according to the difference temperature between the actual exhaust temperature and the expected exhaust temperature; and obtaining a difference pressure according to the corrected expected exhaust manifold pressure and the actual exhaust manifold pressure. Temperature deviation compensation of the exhaust temperature is achieved, and control robustness of the exhaust temperature is improved.
According to another aspect of the present invention, there is provided an exhaust gas temperature adjusting device including:
the expected value acquisition module is used for acquiring matched expected exhaust manifold pressure and expected exhaust temperature according to the engine speed and the single-cycle fuel injection quantity of the engine;
the actual value acquisition module is used for acquiring the actual exhaust manifold pressure according to the upstream pressure of the exhaust temperature management valve, the engine exhaust flow, the downstream temperature of the exhaust temperature management valve, the expected exhaust manifold pressure and the expected exhaust temperature;
and the exhaust temperature adjusting module is used for acquiring a difference pressure according to the expected exhaust manifold pressure and the actual exhaust manifold pressure, and controlling the opening degree of the exhaust temperature management valve according to the difference pressure so as to adjust the exhaust temperature through the opening degree of the exhaust temperature management valve.
According to another aspect of the present invention, there is provided an electronic apparatus including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the exhaust gas temperature regulation method according to any of the embodiments of the present invention.
According to another aspect of the present invention, there is provided a computer-readable storage medium storing computer instructions for causing a processor to execute the exhaust gas temperature adjustment method according to any one of the embodiments of the present invention.
According to the technical scheme of the embodiment of the invention, the actual exhaust manifold pressure is obtained according to the upstream pressure of the exhaust temperature management valve, the exhaust flow of the engine and the downstream temperature of the exhaust temperature management valve, and the opening degree of the exhaust temperature management valve is controlled according to the difference pressure between the actual exhaust manifold pressure and the expected exhaust manifold pressure, so that the exhaust temperature is regulated through the opening degree of the exhaust temperature management valve, the exhaust temperature closed-loop control based on the exhaust manifold pressure is realized, compared with the temperature and pressure detection carried out through a sensor in the traditional technical scheme, the regulation precision of the exhaust temperature is greatly improved through calculating the obtained actual exhaust manifold pressure, the influence of the engine working condition on the detection precision of the sensor is avoided, and meanwhile, the regulation efficiency of the engine exhaust temperature is also improved through regulating the exhaust temperature based on the opening degree of the exhaust temperature management valve.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1A is a schematic structural view of a diesel engine provided according to an embodiment of the present invention;
FIG. 1B is a schematic view of the location of a hold-up gas in a cylinder provided in accordance with an embodiment of the present invention;
fig. 1C is a flowchart of an exhaust gas temperature adjustment method according to a first embodiment of the present invention;
FIG. 2 is a flow chart of another exhaust gas temperature regulation method according to a second embodiment of the present invention;
FIG. 3 is a flow chart of another exhaust gas temperature regulation method provided in accordance with a third embodiment of the present invention;
Fig. 4 is a schematic view of another exhaust gas temperature regulating device according to a fourth embodiment of the present invention
Fig. 5 is a schematic structural view of an electronic device implementing an exhaust gas temperature adjustment method according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
FIG. 1A is a schematic diagram of a diesel engine according to an embodiment of the present invention, wherein, as shown in FIG. 1A, an intake port of a cylinder is connected to an intake manifold, an exhaust port of the cylinder is connected to an exhaust manifold, an outlet of the exhaust manifold is connected to a turbine, and an outlet of the turbine is connected to an exhaust temperature management valve; under normal engine working conditions, when the four-stroke engine is at the end of an exhaust stroke, residual exhaust gas in the engine can squeeze a part of fresh air to enter, so that the fresh air amount is reduced; as shown in fig. 1B, the retained exhaust gas itself occupies the space shown by the volume 1 in the cylinder, and after being expanded in an isentropic manner, the retained exhaust gas occupies the space commonly occupied by the volumes 1 and 2, that is, the fresh air flowing into the cylinder is further reduced due to the isentropic expansion effect of the retained exhaust gas; in the embodiment of the invention, the type of engine is not particularly limited.
Example 1
Fig. 1C is a flowchart of an exhaust gas temperature adjustment method according to a first embodiment of the present invention, where the embodiment may be adapted to adjust the opening of an exhaust gas temperature management valve by calculating the obtained actual exhaust manifold pressure, so as to implement exhaust gas temperature adjustment, and the exhaust gas temperature adjustment device may be implemented in hardware and/or software, and the exhaust gas temperature adjustment device may be configured in an electronic device, typically, may be configured in an engine or a vehicle-mounted terminal device of a vehicle. As shown in fig. 1C, the method includes:
S101, acquiring matched expected exhaust manifold pressure and expected exhaust temperature according to the engine speed and the single-cycle fuel injection quantity of the engine.
The engine speed reflects the number of acting times and the effective power of the engine in unit time, and can be directly obtained through a corresponding sensor in the engine or can be obtained through an engine control system; the single-cycle fuel injection amount of the engine is the fuel amount injected into the cylinder once when the engine executes each cycle operation, and can be obtained through calculation in various modes.
The pressure-temperature reference table is a data comparison table which is drawn in advance by a vehicle engineer based on an empirical value, and is used for respectively pre-configuring matched ideal exhaust manifold pressure (namely, the expected exhaust manifold pressure) according to different engine speeds and single-cycle fuel injection amounts of the engine and configuring matched ideal exhaust temperature (namely, the expected exhaust temperature) under the pressure; after the engine speed and the single-cycle fuel injection quantity of the engine at the current moment are obtained, the matched expected exhaust manifold pressure and the expected exhaust temperature can be obtained according to the pressure temperature reference table; in addition, according to the engine speed at the current moment and the single-cycle fuel injection quantity of the engine, the expected exhaust manifold pressure and the expected exhaust temperature can be obtained through calculation according to a pre-configured calculation formula.
S103, acquiring the actual exhaust manifold pressure according to the upstream pressure of the exhaust temperature management valve, the engine exhaust flow, the downstream temperature of the exhaust temperature management valve, the expected exhaust manifold pressure and the expected exhaust temperature.
The downstream temperature of the exhaust gas temperature management valve, i.e., the temperature at the outlet position of the exhaust gas temperature management valve, may be obtained by a temperature sensor at that position, or by an engine control system, at T ex Representing the temperature downstream of the exhaust gas temperature management valve; the exhaust flow of the engine refers to the exhaust rate of the engine after combustion during operation, and the exhaust flow can be obtained by the engine control system and is M ex Representing engine exhaust flow; the pressure upstream of the exhaust gas temperature management valve, i.e., the pressure at the inlet position of the exhaust gas temperature management valve, may be obtained by a pressure sensor at that position, or by the engine control system, at P in Representing the pressure upstream of the exhaust temperature management valve. Furthermore, P is used ref And T ref Indicating a desired exhaust manifold pressure and a desired exhaust temperature, respectively.
Thus, after the upstream pressure of the exhaust gas temperature management valve, the engine exhaust gas flow, and the downstream temperature of the exhaust gas temperature management valve are obtained, the actual exhaust manifold pressure may be obtained by the following equation:
Wherein g3 represents a calibrated one-dimensional data table, which represents a one-dimensional function of the san-valnan curve, and specifically reflects a specific relationship between turbine flow and pressure ratio at two ends of the turbine, g3 -1 The inverse function of g3 is represented, that is, the function obtained after the exchange of the independent and dependent variables of g 3.
Optionally, in an embodiment of the present invention, the obtaining the actual exhaust manifold pressure according to the upstream pressure of the exhaust temperature management valve, the engine exhaust flow, the downstream temperature of the exhaust temperature management valve, the desired exhaust manifold pressure, and the desired exhaust temperature specifically includes: acquiring actual air inlet efficiency according to the air inlet manifold pressure, the engine rotating speed and the expected exhaust manifold pressure; and obtaining the exhaust flow of the engine according to the actual air inlet efficiency, the theoretical air inlet amount and the fuel flow.
Specifically, the original charge efficiency of the engine may be obtained by the following equation:
Eff raw ＝g(P im ne) (1-2)
Wherein Eff raw Representing the original charge efficiency of the engine, P im Represents intake manifold pressure, ne represents engine speed; g (P) im Ne) may be a calibrated data table according to P im Eff for obtaining matches with Ne queries raw The value may also be a value including the parameter P im And a polynomial of Ne;
the exhaust gas charge efficiency of an engine can be obtained by the following equation:
Eff ex ＝h(P ex ne) (1-3)
Wherein Eff ex Represents exhaust gas charging efficiency of engine, P ex Represents exhaust manifold pressure; h (P) ex Ne) may represent a data table of calibration completion, according to P ex Eff for obtaining matches with Ne queries ex The value may also be a value including the parameter P ex And a polynomial of Ne.
Substituting the above (formula 1-2) and (formula 1-3) into the following equation:
the actual air inlet efficiency Eff of the engine can be obtained; the fresh air flow of the engine is then obtained according to the following equation:
M air ＝M theo * Eff (1-5)
Wherein M is air Represents fresh air flow, M theo Representing the theoretical intake air amount, the theoretical intake air amount can be obtained by the following equation:
wherein T is im The intake manifold temperature can be represented and obtained by a temperature sensor built in the engine; v (V) im Representing intake manifold volume; r represents a gas constant.
Finally, the exhaust flow of the engine can be obtained according to the following equation:
M ex ＝M air +M f (1-7)
Wherein M is ex For engine exhaust flow, M f Is the engine fuel flow, which can also be obtained by the engine control system.
In particular, since the exhaust manifold pressure is the final desired value in the above-described technical solution, it is obvious that the value is unknown in the process of calculating the engine exhaust flow, and the desired exhaust manifold pressure can be used as the value when calculating the engine exhaust flow, so as to calculate the value of the engine exhaust flow through the desired exhaust manifold pressure. Compared with the method for estimating and acquiring the engine exhaust flow in the traditional technical scheme, in the embodiment of the invention, the engine exhaust flow is acquired in the calculation mode according to the acquired expected exhaust manifold pressure, so that the calculation accuracy of the engine exhaust flow is greatly improved, the actual exhaust manifold pressure acquired based on the engine exhaust flow is further improved, and the accurate control of the exhaust temperature is ensured.
Optionally, in an embodiment of the present invention, the obtaining the actual exhaust manifold pressure according to the upstream pressure of the exhaust temperature management valve, the engine exhaust flow, the downstream temperature of the exhaust temperature management valve, the desired exhaust manifold pressure, and the desired exhaust temperature specifically includes: the upstream pressure of the exhaust temperature management valve is obtained from the downstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the opening degree of the exhaust temperature management valve, and the downstream temperature of the exhaust temperature management valve.
Specifically, the upstream pressure of the exhaust gas temperature management valve may be obtained by calculation through the following equation, in addition to being obtained directly through a corresponding sensor or through the engine control system:
wherein P is out Representing the pressure downstream of the exhaust temperature management valve, which may be obtained by a corresponding pressure sensor, or by an engine control system; u represents the opening degree of the exhaust temperature management valve; g2 represents a calibrated one-dimensional data table, which also characterizes a one-dimensional function of the san Winan curve, g2 -1 The inverse function of g2 is represented, namely, the function obtained after the independent variable and the dependent variable of g2 are exchanged; f3 represents a calibrated one-dimensional data table reflecting the relationship between the opening of the exhaust temperature management valve and the area of the effective flow cross section.
Because the pressure sensor is limited by the structure of the diesel engine, when the pressure sensor is arranged at the upstream of the exhaust temperature management valve, the pressure sensor is greatly influenced by the vibration of the turbine, the exhaust manifold, the cylinder and other upstream components, therefore, compared with the pressure sensor arranged at the downstream of the exhaust temperature management valve, the detection precision of the pressure sensor arranged at the upstream position is lower, therefore, the pressure sensor can be arranged at the downstream of the exhaust temperature management valve to acquire the downstream pressure of the exhaust temperature management valve with more accurate value, and further the upstream pressure of the exhaust temperature management valve is acquired according to the calculation of the downstream pressure of the exhaust temperature management valve, thereby reducing the vibration influence of the turbine, the exhaust manifold, the cylinder and other upstream components and improving the numerical precision of the upstream pressure of the exhaust temperature management valve.
Optionally, in an embodiment of the present invention, the obtaining the upstream pressure of the exhaust temperature management valve according to the downstream pressure of the exhaust temperature management valve, the engine exhaust flow, the opening of the exhaust temperature management valve, and the downstream temperature of the exhaust temperature management valve specifically includes: the downstream pressure of the exhaust temperature management valve is obtained based on the barometric pressure, the engine exhaust flow, and the downstream temperature of the exhaust temperature management valve.
Specifically, the pressure downstream of the exhaust gas temperature management valve may be obtained by calculation through the following equation in addition to the corresponding sensor or the engine control system:
wherein P is a Represents atmospheric pressure; when the exhaust manifold pressure is referred to as an argument in (formulas 1 to 8) and (formulas 1 to 9), the desired exhaust manifold pressure may be substituted as well; f2 represents a calibrated one-dimensional data table for calculating the pressure difference across the aftertreatment.
The pressure sensor is arranged at the downstream of the exhaust temperature management valve and still is influenced by the oscillation of the turbine, the exhaust manifold, the cylinder and other upstream components, so that compared with the pressure sensor arranged at the downstream of the exhaust temperature management valve, the obtained downstream pressure of the exhaust temperature management valve is calculated in the mode, the influence of the oscillation of the turbine, the exhaust manifold, the cylinder and other upstream components is further avoided, and the numerical precision of the downstream pressure of the exhaust temperature management valve is improved.
S103, obtaining a difference pressure according to the expected exhaust manifold pressure and the actual exhaust manifold pressure, and controlling the opening degree of the exhaust temperature management valve according to the difference pressure so as to adjust the exhaust temperature through the opening degree of the exhaust temperature management valve.
After the differential pressure is obtained according to the desired exhaust manifold pressure and the actual exhaust manifold pressure, the opening of the exhaust temperature management valve is calculated and obtained through a proportional integral controller according to the differential pressure, and then the exhaust temperature of the engine is regulated by controlling the opening of the exhaust temperature management valve.
According to the technical scheme of the embodiment of the invention, the actual exhaust manifold pressure is obtained according to the upstream pressure of the exhaust temperature management valve, the exhaust flow of the engine and the downstream temperature of the exhaust temperature management valve, and the opening degree of the exhaust temperature management valve is controlled according to the difference pressure between the actual exhaust manifold pressure and the expected exhaust manifold pressure, so that the exhaust temperature is regulated through the opening degree of the exhaust temperature management valve, the exhaust temperature closed-loop control based on the exhaust manifold pressure is realized, compared with the temperature and pressure detection carried out through a sensor in the traditional technical scheme, the regulation precision of the exhaust temperature is greatly improved through calculating the obtained actual exhaust manifold pressure, the influence of the engine working condition on the detection precision of the sensor is avoided, and meanwhile, the regulation efficiency of the engine exhaust temperature is also improved through regulating the exhaust temperature based on the opening degree of the exhaust temperature management valve.
Example two
Fig. 2 is a flowchart of an exhaust gas temperature adjustment method according to a second embodiment of the present invention, where in the first embodiment, iterative calculation is performed based on an engine exhaust gas flow rate and an exhaust manifold pressure to obtain an actual exhaust manifold pressure after the iteration is completed. As shown in fig. 2, the method includes:
s201, according to the engine speed and the single-cycle fuel injection quantity of the engine, the matched expected exhaust manifold pressure and the expected exhaust temperature are obtained.
S202, calculating actual air inlet efficiency, downstream pressure of an exhaust temperature management valve, upstream pressure of the exhaust temperature management valve, exhaust manifold pressure and exhaust gas charging efficiency in sequence.
The exhaust manifold pressure is influenced by the engine exhaust flow, and the engine exhaust flow is also influenced by the exhaust manifold pressure, and the two are mutually influencing variables; therefore, through iterative calculation, the two values can be made to be smooth, so as to obtain an iteration completion convergence value, namely, the exhaust manifold pressure after iteration completion is taken as the actual exhaust manifold pressure; as shown in the above technical scheme, in the iterative initial state, the exhaust gas charging efficiency Eff of the engine can be improved ex Set to 0 value, and the actual intake efficiency, the downstream pressure of the exhaust temperature management valve, and the exhaust temperature pipe are obtained by sequentially calculating the following (formula 2-1) to (formula 2-5)Upstream pressure of the trim valve, exhaust manifold pressure, and exhaust charge efficiency.
Eff ex ＝h(P ex Ne) (2-5)
And S203, continuously and sequentially calculating the actual air inlet efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure and the exhaust gas charging efficiency according to the current exhaust gas charging efficiency, and taking the current exhaust manifold pressure as the actual exhaust manifold pressure when the iteration times reach a preset iteration threshold.
Substituting the numerical value of (formula 2-5) into (formula 2-1) after finishing one-time traversal calculation, and continuously executing the next traversal calculation until the iteration number reaches a preset iteration threshold, wherein the current exhaust manifold pressure obtained by the calculation of (formula 2-4) is used as the actual exhaust manifold pressure; the preset iteration threshold may be configured as required, for example, the preset iteration threshold may be set to 3 to 5 times.
S204, obtaining a difference pressure according to the expected exhaust manifold pressure and the actual exhaust manifold pressure, and controlling the opening degree of the exhaust temperature management valve according to the difference pressure so as to adjust the exhaust temperature through the opening degree of the exhaust temperature management valve.
Optionally, in an embodiment of the present invention, after sequentially calculating the actual intake air efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure, and the exhaust gas charging efficiency, the method further includes: and continuously and sequentially calculating the actual air inlet efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure and the exhaust gas charging efficiency according to the current exhaust gas charging efficiency, and taking the current exhaust manifold pressure as the actual exhaust manifold pressure when the difference pressure between the current exhaust manifold pressure and the expected exhaust manifold pressure is smaller than or equal to a preset difference threshold value.
Specifically, when the calculation formula is iterated, if the current exhaust manifold pressure obtained by calculation is closer to the value of the expected exhaust manifold pressure, that is, the difference between the current exhaust manifold pressure and the expected exhaust manifold pressure is smaller, that is, the difference is smaller than or equal to the preset difference threshold, the value of the current exhaust manifold pressure is also indicated to be converged, and even if the preset iteration threshold is not reached, the accurate exhaust manifold pressure can be considered to be obtained at the moment, so that the current exhaust manifold pressure is taken as the actual exhaust manifold pressure, the iteration times are reduced, the operation complexity is reduced, and the obtaining efficiency of the actual exhaust manifold pressure is improved.
According to the technical scheme, the actual exhaust manifold pressure is obtained through iterative calculation of the actual air inlet efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure and the exhaust charging efficiency, so that the actual exhaust manifold pressure is obtained through iterative calculation on the basis that the engine exhaust flow is not known, the numerical influence of calculation errors of the engine exhaust flow on the actual exhaust manifold pressure is avoided, and the calculation accuracy of the actual exhaust manifold pressure is further improved.
Example III
Fig. 3 is a flowchart of an exhaust gas temperature adjustment method according to a third embodiment of the present invention, where the temperature is adjusted according to a difference between an actual exhaust gas temperature and a desired exhaust gas temperature on the basis of the first embodiment, and a corrected desired exhaust manifold pressure is obtained. As shown in fig. 3, the method includes:
s301, acquiring matched expected exhaust manifold pressure and expected exhaust temperature according to the engine speed and the single-cycle fuel injection quantity of the engine.
S302, acquiring the actual exhaust manifold pressure according to the upstream pressure of the exhaust temperature management valve, the engine exhaust flow, the downstream temperature of the exhaust temperature management valve, the expected exhaust manifold pressure and the expected exhaust temperature.
S303, acquiring the corrected expected exhaust manifold pressure according to the difference temperature between the actual exhaust temperature and the expected exhaust temperature.
The actual exhaust temperature is detected by a sensor located downstream of the exhaust temperature management valve; the desired exhaust temperature is a temperature value obtained by querying a pressure temperature reference table; according to the temperature difference between the two, if the temperature difference is a positive number, a weight forward table is called to obtain a matched weight value, then the weight value and the maximum positive deviation are multiplied according to the maximum positive deviation of the pressure of the intake manifold, and the multiplied result is added with the pressure of the expected exhaust manifold to obtain the corrected pressure of the expected exhaust manifold; the corresponding relation between different temperature differences and weight values is pre-configured in a weight forward table, and the numerical range of the weight values is more than or equal to 0 and less than or equal to 1; the maximum positive deviation of the intake manifold pressure is the upper limit threshold of the safety pressure value, namely the maximum pressure value allowed by the intake manifold is represented, and can be configured and generated according to the requirement.
Similarly, if the temperature difference is a negative number, a weight negative table is called to obtain a matched weight value, then the weight value is multiplied by the maximum positive deviation according to the maximum negative deviation of the intake manifold pressure, and the multiplied result is added with the expected exhaust manifold pressure to obtain the corrected expected exhaust manifold pressure; the corresponding relation between different temperature differences and weight values is pre-configured in a weight negative table, and the numerical range of the weight values is more than or equal to 0 and less than or equal to 1; the maximum negative deviation of the pressure of the air inlet manifold is the lower limit threshold value of the safety pressure value, namely the minimum pressure value allowed by the air inlet manifold is represented, and the maximum negative deviation of the pressure of the air inlet manifold can be generated according to the required configuration.
S304, obtaining a difference pressure according to the corrected expected exhaust manifold pressure and the actual exhaust manifold pressure.
And S305, controlling the opening degree of the exhaust temperature management valve according to the differential pressure so as to adjust the exhaust temperature through the opening degree of the exhaust temperature management valve.
According to the technical scheme, after the actual exhaust manifold pressure is obtained, the corrected expected exhaust manifold pressure is obtained according to the difference temperature between the actual exhaust temperature and the expected exhaust temperature, and further the difference pressure is obtained according to the corrected expected exhaust manifold pressure and the actual exhaust manifold pressure, so that temperature deviation compensation of the exhaust temperature is realized, namely the exhaust temperature is reduced when the exhaust temperature is too high, the exhaust temperature is increased when the exhaust temperature is too low, and the control robustness of the exhaust temperature is improved.
Example IV
Fig. 4 is a block diagram of an exhaust gas temperature adjusting device according to a fourth embodiment of the present invention, which specifically includes:
the expected value obtaining module 401 is configured to obtain a matched expected exhaust manifold pressure and an expected exhaust temperature according to an engine speed and an engine single cycle fuel injection amount;
an actual value acquisition module 402 configured to acquire an actual exhaust manifold pressure based on an upstream pressure of an exhaust temperature management valve, an engine exhaust flow, a downstream temperature of the exhaust temperature management valve, the desired exhaust manifold pressure, and the desired exhaust temperature;
An exhaust temperature adjustment module 403 for obtaining a differential pressure based on the desired exhaust manifold pressure and the actual exhaust manifold pressure, and controlling the opening of the exhaust temperature management valve based on the differential pressure to adjust the exhaust temperature by the opening of the exhaust temperature management valve.
According to the technical scheme of the embodiment of the invention, the actual exhaust manifold pressure is obtained according to the upstream pressure of the exhaust temperature management valve, the exhaust flow of the engine and the downstream temperature of the exhaust temperature management valve, and the opening degree of the exhaust temperature management valve is controlled according to the difference pressure between the actual exhaust manifold pressure and the expected exhaust manifold pressure, so that the exhaust temperature is regulated through the opening degree of the exhaust temperature management valve, the exhaust temperature closed-loop control based on the exhaust manifold pressure is realized, compared with the temperature and pressure detection carried out through a sensor in the traditional technical scheme, the regulation precision of the exhaust temperature is greatly improved through calculating the obtained actual exhaust manifold pressure, the influence of the engine working condition on the detection precision of the sensor is avoided, and meanwhile, the regulation efficiency of the engine exhaust temperature is also improved through regulating the exhaust temperature based on the opening degree of the exhaust temperature management valve.
Optionally, the actual value obtaining module 402 is specifically configured to obtain the actual intake efficiency according to the intake manifold pressure, the engine speed, and the desired exhaust manifold pressure; and obtaining the exhaust flow of the engine according to the actual air inlet efficiency, the theoretical air inlet amount and the fuel flow.
Optionally, the actual value obtaining module 402 is specifically further configured to obtain the upstream pressure of the exhaust temperature management valve according to the downstream pressure of the exhaust temperature management valve, the engine exhaust flow, the opening of the exhaust temperature management valve, and the downstream temperature of the exhaust temperature management valve.
Optionally, the actual value obtaining module 402 is specifically further configured to obtain the downstream pressure of the exhaust temperature management valve according to the atmospheric pressure, the engine exhaust flow, and the downstream temperature of the exhaust temperature management valve.
Optionally, the actual value obtaining module 402 is specifically further configured to sequentially calculate an actual intake efficiency, a downstream pressure of the exhaust temperature management valve, an upstream pressure of the exhaust temperature management valve, an exhaust manifold pressure, and an exhaust gas charging efficiency; and continuously and sequentially calculating the actual air inlet efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure and the exhaust gas charging efficiency according to the current exhaust gas charging efficiency, and taking the current exhaust manifold pressure as the actual exhaust manifold pressure when the iteration times reach a preset iteration threshold.
Optionally, the actual value obtaining module 402 is further specifically configured to continuously calculate, in order, the actual intake efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure, and the exhaust gas charging efficiency according to the current exhaust gas charging efficiency, until the difference pressure between the current exhaust manifold pressure and the desired exhaust manifold pressure is less than or equal to the preset difference threshold, and take the current exhaust manifold pressure as the actual exhaust manifold pressure.
Optionally, the exhaust temperature adjustment module 403 is specifically configured to obtain the corrected desired exhaust manifold pressure according to a difference temperature between the actual exhaust temperature and the desired exhaust temperature; and obtaining a difference pressure according to the corrected expected exhaust manifold pressure and the actual exhaust manifold pressure.
The device can execute the exhaust temperature regulating method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the executing method. Technical details not described in detail in the present embodiment may be referred to the exhaust gas temperature adjustment method provided in any embodiment of the present invention.
Example five
Fig. 5 shows a schematic diagram of the structure of an electronic device 10 that may be used to implement an embodiment of the invention. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. Electronic equipment may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.
As shown in fig. 5, the electronic device 10 includes at least one processor 11, and a memory, such as a Read Only Memory (ROM) 12, a Random Access Memory (RAM) 13, etc., communicatively connected to the at least one processor 11, in which the memory stores a computer program executable by the at least one processor, and the processor 11 may perform various appropriate actions and processes according to the computer program stored in the Read Only Memory (ROM) 12 or the computer program loaded from the storage unit 18 into the Random Access Memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 may also be stored. The processor 11, the ROM 12 and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to bus 14.
Various components in the electronic device 10 are connected to the I/O interface 15, including: an input unit 16 such as a keyboard, a mouse, etc.; an output unit 17 such as various types of displays, speakers, and the like; a storage unit 18 such as a magnetic disk, an optical disk, or the like; and a communication unit 19 such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information/data with other devices via a computer network, such as the internet, and/or various telecommunication networks.
The processor 11 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. The processor 11 performs the various methods and processes described above, such as the exhaust gas temperature adjustment method.
In some embodiments, the exhaust gas temperature regulation method may be implemented as a computer program tangibly embodied on a computer-readable storage medium, such as a storage unit. In some embodiments, part or all of the computer program may be loaded and/or installed onto the heterogeneous hardware accelerator via the ROM and/or the communication unit. When the computer program is loaded into RAM and executed by a processor, one or more steps of the exhaust gas temperature regulation method described above may be performed. Alternatively, in other embodiments, the processor may be configured to perform the exhaust gas temperature regulation method by any other suitable means (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for carrying out methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on a heterogeneous hardware accelerator having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and pointing device (e.g., a mouse or a trackball) through which a user can provide input to the heterogeneous hardware accelerator. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. An exhaust gas temperature adjustment method, characterized by comprising:
acquiring matched expected exhaust manifold pressure and expected exhaust temperature according to the engine speed and the single-cycle fuel injection quantity of the engine;
acquiring an actual exhaust manifold pressure according to an upstream pressure of an exhaust temperature management valve, an engine exhaust flow, a downstream temperature of the exhaust temperature management valve, the desired exhaust manifold pressure and the desired exhaust temperature;
And obtaining a differential pressure according to the expected exhaust manifold pressure and the actual exhaust manifold pressure, and controlling the opening degree of the exhaust temperature management valve according to the differential pressure so as to adjust the exhaust temperature through the opening degree of the exhaust temperature management valve.
2. The method of claim 1, wherein the obtaining an actual exhaust manifold pressure based on an upstream pressure of an exhaust temperature management valve, an engine exhaust flow, a downstream temperature of an exhaust temperature management valve, the desired exhaust manifold pressure, and the desired exhaust temperature, specifically comprises:
acquiring actual air inlet efficiency according to the air inlet manifold pressure, the engine rotating speed and the expected exhaust manifold pressure;
and obtaining the exhaust flow of the engine according to the actual air inlet efficiency, the theoretical air inlet amount and the fuel flow.
3. The method of claim 1, wherein the obtaining an actual exhaust manifold pressure based on an upstream pressure of an exhaust temperature management valve, an engine exhaust flow, a downstream temperature of an exhaust temperature management valve, the desired exhaust manifold pressure, and the desired exhaust temperature, specifically comprises:
the upstream pressure of the exhaust temperature management valve is obtained from the downstream pressure of the exhaust temperature management valve, the engine exhaust flow rate, the opening degree of the exhaust temperature management valve, and the downstream temperature of the exhaust temperature management valve.
4. A method according to claim 3, wherein the step of obtaining the upstream pressure of the exhaust temperature management valve based on the downstream pressure of the exhaust temperature management valve, the engine exhaust flow, the opening of the exhaust temperature management valve, and the downstream temperature of the exhaust temperature management valve comprises:
the downstream pressure of the exhaust temperature management valve is obtained based on the barometric pressure, the engine exhaust flow, and the downstream temperature of the exhaust temperature management valve.
5. The method of claim 1, wherein the obtaining an actual exhaust manifold pressure based on an upstream pressure of an exhaust temperature management valve, an engine exhaust flow, a downstream temperature of an exhaust temperature management valve, the desired exhaust manifold pressure, and the desired exhaust temperature, specifically comprises:
sequentially calculating actual intake efficiency, downstream pressure of an exhaust temperature management valve, upstream pressure of the exhaust temperature management valve, exhaust manifold pressure and exhaust gas charging efficiency;
and continuously and sequentially calculating the actual air inlet efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure and the exhaust gas charging efficiency according to the current exhaust gas charging efficiency, and taking the current exhaust manifold pressure as the actual exhaust manifold pressure when the iteration times reach a preset iteration threshold.
6. The method according to claim 5, further comprising, after sequentially calculating the actual intake efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure, and the exhaust charge efficiency:
and continuously and sequentially calculating the actual air inlet efficiency, the downstream pressure of the exhaust temperature management valve, the upstream pressure of the exhaust temperature management valve, the exhaust manifold pressure and the exhaust gas charging efficiency according to the current exhaust gas charging efficiency, and taking the current exhaust manifold pressure as the actual exhaust manifold pressure when the difference pressure between the current exhaust manifold pressure and the expected exhaust manifold pressure is smaller than or equal to a preset difference threshold value.
7. The method of claim 1, wherein the deriving a differential pressure from the desired exhaust manifold pressure and the actual exhaust manifold pressure comprises:
acquiring corrected expected exhaust manifold pressure according to the difference temperature between the actual exhaust temperature and the expected exhaust temperature;
and obtaining a difference pressure according to the corrected expected exhaust manifold pressure and the actual exhaust manifold pressure.
8. An exhaust gas temperature adjustment device, characterized by comprising:
the expected value acquisition module is used for acquiring matched expected exhaust manifold pressure and expected exhaust temperature according to the engine speed and the single-cycle fuel injection quantity of the engine;
The actual value acquisition module is used for acquiring the actual exhaust manifold pressure according to the upstream pressure of the exhaust temperature management valve, the engine exhaust flow, the downstream temperature of the exhaust temperature management valve, the expected exhaust manifold pressure and the expected exhaust temperature;
and the exhaust temperature adjusting module is used for acquiring a difference pressure according to the expected exhaust manifold pressure and the actual exhaust manifold pressure, and controlling the opening degree of the exhaust temperature management valve according to the difference pressure so as to adjust the exhaust temperature through the opening degree of the exhaust temperature management valve.
9. An electronic device, the electronic device comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the exhaust gas temperature regulation method of any one of claims 1-7.
10. A computer readable storage medium, characterized in that the computer readable storage medium stores computer instructions for causing a processor to implement the exhaust gas temperature regulation method of any one of claims 1-7 when executed.
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