CN116971863A

CN116971863A - Control method and device for urea injection quantity, readable storage medium and electronic equipment

Info

Publication number: CN116971863A
Application number: CN202310889344.1A
Authority: CN
Inventors: 王井山; 吕志华; 苏菲菲; 孙彦斌; 魏锋; 张宝强; 赵子申
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2023-07-19
Filing date: 2023-07-19
Publication date: 2023-10-31

Abstract

The application provides a control method and device of urea injection quantity, a readable storage medium and electronic equipment, wherein the method comprises the following steps: acquiring the real temperature and the real urea injection quantity of the urea aqueous solution in real time; acquiring a reference urea injection quantity, wherein the reference urea injection quantity is the mass of urea sprayed by a rotational flow atomizing nozzle when the tail gas emission quantity of an engine meets the standard emission quantity; and adjusting the injection duty ratio of the swirl atomizing nozzle and/or the injection pressure of the swirl atomizing nozzle at least according to the actual temperature of the urea aqueous solution so that the actual urea injection amount is the same as the reference urea injection amount, wherein the injection duty ratio of the swirl atomizing nozzle is the duty ratio of an injection valve of the swirl atomizing nozzle. According to the method, different injection quantity correction strategies are carried out on different temperature and different duty ratio signals, so that the injection precision of the swirl atomizing nozzle is effectively improved, and the problem that the urea injection quantity precision is low due to the fact that the swirl atomizing nozzle is greatly influenced by temperature is solved.

Description

Control method and device for urea injection quantity, readable storage medium and electronic equipment

Technical Field

The application relates to the field of urea nozzle precision control, in particular to a urea injection quantity control method, a urea injection quantity control device, a computer readable storage medium and electronic equipment.

Background

The urea nozzle is a core part in the SCR post-treatment system of the diesel engine or the HPDI engine, and along with the improvement of emission regulations and the improvement of the thermal efficiency of the diesel engine, the urea nozzle has higher requirements on the spray particle size, and in order to realize smaller spray particle size, a rotational flow atomizing nozzle appears, so that the urea aqueous solution is atomized better by utilizing the rotational centrifugal force. However, when the swirl atomizing nozzle sprays, gas nuclei are easily generated at the center of the liquid beam, and the viscosity of the urea solution is greatly changed along with the change of the temperature, so that the gas nuclei at the center of the liquid beam are changed, and the accuracy of urea spraying quantity is affected. And poor accuracy of urea injection amount can lead to NO _x Or NH ₃ And the emission of pollutants is increased.

Disclosure of Invention

The application mainly aims to provide a urea injection quantity control method, a urea injection quantity control device, a computer-readable storage medium and electronic equipment, so as to at least solve the problem that the precision of the urea injection quantity is low due to the fact that a swirl atomizing nozzle is greatly influenced by temperature.

In order to achieve the above object, according to one aspect of the present application, there is provided a control method of urea injection quantity, comprising: acquiring the real temperature of the urea aqueous solution and the real urea injection quantity in real time, wherein the real temperature of the urea aqueous solution is the temperature of the urea aqueous solution at the current moment, and the real urea injection quantity is the mass of the urea really sprayed by the swirl atomizing nozzle at the current moment; acquiring a reference urea injection quantity, wherein the reference urea injection quantity is the mass of urea sprayed by the swirl atomizing nozzle when the tail gas emission quantity of an engine meets the standard emission quantity; and adjusting the injection duty ratio of the swirl atomizing nozzle and/or the injection pressure of the swirl atomizing nozzle at least according to the real temperature of the urea aqueous solution so that the real urea injection amount is the same as the reference urea injection amount, wherein the injection duty ratio of the swirl atomizing nozzle is the duty ratio of an injection valve of the swirl atomizing nozzle.

Optionally, adjusting the injection duty cycle of the swirl atomizing nozzle at least according to the actual temperature of the urea aqueous solution so that the actual urea injection amount is the same as the reference urea injection amount, including: reducing the spray duty ratio of the swirl atomizing nozzle under the condition that the real temperature of the urea aqueous solution is smaller than a preset temperature until the real urea spray amount is equal to the reference urea spray amount; and under the condition that the real temperature of the urea aqueous solution is greater than the preset temperature and the injection duty ratio of the rotational flow atomizing nozzle is smaller than the preset duty ratio, increasing the injection duty ratio of the rotational flow atomizing nozzle until the real urea injection amount is equal to the reference urea injection amount or until the injection duty ratio of the rotational flow atomizing nozzle reaches the preset duty ratio.

Optionally, adjusting the injection pressure of the swirl atomizing nozzle at least according to the actual temperature of the urea aqueous solution so that the actual urea injection amount is the same as the reference urea injection amount, including: and under the condition that the real temperature of the urea aqueous solution is greater than a preset temperature and the injection duty ratio of the rotational flow atomizing nozzle is greater than or equal to the preset duty ratio, increasing the injection pressure of the rotational flow atomizing nozzle until the real urea injection amount is equal to the reference urea injection amount.

Optionally, in a case that the real temperature of the urea aqueous solution is greater than a preset temperature and the injection duty cycle of the swirl atomizing nozzle is greater than or equal to a preset duty cycle, increasing the injection pressure of the swirl atomizing nozzle until the real urea injection amount is equal to the reference urea injection amount, including: obtaining a target difference value and/or a target ratio, wherein the target difference value is a difference value between the real temperature of the urea aqueous solution and the preset temperature, and the target ratio is a ratio between the real temperature of the urea aqueous solution and the preset temperature; determining a pressure regulating coefficient according to the target difference value and/or the target ratio; and increasing the injection pressure of the swirl atomizing nozzle according to the pressure regulating coefficient until the real urea injection quantity is equal to the reference urea injection quantity.

Optionally, adjusting the injection duty cycle of the swirl atomizing nozzle at least according to the actual temperature of the urea aqueous solution so that the actual urea injection amount is the same as the reference urea injection amount, including: obtaining a target difference value and/or a target ratio, wherein the target difference value is a difference value between the real temperature of the urea aqueous solution and a preset temperature, and the target ratio is a ratio between the real temperature of the urea aqueous solution and the preset temperature; determining a duty cycle adjustment coefficient according to the target difference value and/or the target ratio; and adjusting the injection duty ratio of the rotational flow atomizing nozzle according to the duty ratio adjusting coefficient until the real urea injection amount is equal to the reference urea injection amount or until the injection duty ratio of the rotational flow atomizing nozzle reaches a preset duty ratio.

Optionally, adjusting the injection duty cycle of the swirl atomizing nozzle and/or the injection pressure of the swirl atomizing nozzle so that the actual urea injection amount is the same as the reference urea injection amount at least according to the actual temperature of the urea aqueous solution, including: the method comprises the steps of obtaining an injection quantity correction model, wherein the input of the injection quantity correction model is the real temperature of urea aqueous solution, the injection duty ratio of a rotational flow atomizing nozzle and the injection pressure of the rotational flow atomizing nozzle, the output of the injection quantity correction model is the urea injection quantity, the injection quantity correction model is obtained by training a neural network structure by using a plurality of sets of training data, and each set of training data in the plurality of sets of training data comprises the data obtained in a historical time period: the real temperature of the urea aqueous solution, the injection duty ratio of the swirl atomizing nozzle and the injection pressure of the swirl atomizing nozzle, wherein the injection quantity correction model is at least related to the length-diameter ratio of the swirl atomizing nozzle and the diameter of a swirl chamber of the swirl atomizing nozzle; and adjusting the injection duty ratio of the swirl atomizing nozzle and/or the injection pressure of the swirl atomizing nozzle according to the real temperature of the urea aqueous solution and the injection quantity correction model so that the real urea injection quantity is the same as the reference urea injection quantity.

Optionally, adjusting the injection duty cycle of the swirl atomizing nozzle and/or the injection pressure of the swirl atomizing nozzle so that the actual urea injection amount is the same as the reference urea injection amount at least according to the actual temperature of the urea aqueous solution, including: when the real temperature of the urea aqueous solution is smaller than a preset temperature and the real urea injection amount is larger than the reference urea injection amount, the injection duty ratio of the swirl atomizing nozzle is reduced until the real urea injection amount is equal to the reference urea injection amount; increasing the injection duty cycle of the swirl atomizing nozzle until the actual urea injection amount is equal to the reference urea injection amount or until the injection duty cycle of the swirl atomizing nozzle reaches the preset duty cycle under the condition that the actual temperature of the urea aqueous solution is greater than the preset temperature, the actual urea injection amount is smaller than the reference urea injection amount, and the injection duty cycle of the swirl atomizing nozzle is smaller than the preset duty cycle; and under the condition that the real temperature of the urea aqueous solution is greater than the preset temperature, the real urea injection quantity is smaller than the reference urea injection quantity, and the injection duty ratio of the swirl atomizing nozzle is greater than or equal to the preset duty ratio, increasing the injection pressure of the swirl atomizing nozzle until the real urea injection quantity is equal to the reference urea injection quantity.

According to another aspect of the present application, there is provided a control method of urea injection quantity, including: the first acquisition unit is used for acquiring the real temperature of the urea aqueous solution and the real urea injection quantity in real time, wherein the real temperature of the urea aqueous solution is the temperature of the urea aqueous solution at the current moment, and the real urea injection quantity is the mass of the urea really sprayed by the swirl atomizing nozzle at the current moment; the second acquisition unit is used for acquiring a reference urea injection quantity, wherein the reference urea injection quantity is the mass of urea sprayed by the swirl atomizing nozzle when the tail gas emission quantity of the engine meets the standard emission quantity; and the adjusting unit is used for adjusting the injection duty ratio of the rotational flow atomizing nozzle and/or the injection pressure of the rotational flow atomizing nozzle at least according to the real temperature of the urea aqueous solution so that the real urea injection quantity is the same as the reference urea injection quantity, and the injection duty ratio of the rotational flow atomizing nozzle is the duty ratio of an injection valve of the rotational flow atomizing nozzle.

According to another aspect of the present application, there is provided a computer readable storage medium including a stored program, wherein the program when run controls a device in which the computer readable storage medium is located to execute any one of the control methods of urea injection quantity.

According to another aspect of the present application, there is provided an electronic apparatus including: the system comprises one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, and the one or more programs comprise a control method for executing any one of the urea injection amounts.

By applying the technical scheme of the application, the control method of the urea injection quantity firstly obtains the real temperature of the urea aqueous solution and the real urea injection quantity in real time, wherein the real temperature of the urea aqueous solution is the temperature of the urea aqueous solution at the current moment, and the real urea injection quantity is the mass of the urea really sprayed by the swirl atomizing nozzle at the current moment; then, acquiring a reference urea injection quantity which is the mass of urea sprayed by a rotational flow atomizing nozzle when the tail gas emission quantity of the engine meets the standard emission quantity; finally, according to at least the real temperature of the urea aqueous solution, the injection duty ratio of the rotational flow atomizing nozzle and/or the injection pressure of the rotational flow atomizing nozzle are/is adjusted so that the real urea injection quantity is the same as the reference urea injection quantity, and the injection duty ratio of the rotational flow atomizing nozzle is the duty ratio of an injection valve of the rotational flow atomizing nozzle. According to the method, the spray quantity of the swirl atomizing nozzle at different urea water solution temperatures is corrected through optimizing an injection strategy; for the case of lower temperature, the correction is accomplished by only reducing the duty cycle; for the condition of higher temperature, different injection quantity correction strategies are carried out by adopting a duty ratio signal, so that the injection precision of the cyclone atomization nozzle is effectively improved, and the problem of lower urea injection quantity precision caused by the fact that the cyclone atomization nozzle is greatly influenced by temperature is solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

fig. 1 is a block diagram showing a hardware configuration of a mobile terminal that performs a control method of urea injection quantity according to an embodiment of the present application;

FIG. 2 is a flow chart of a method for controlling urea injection quantity according to an embodiment of the present application;

FIG. 3 is a flow chart illustrating another urea injection quantity control method provided in accordance with an embodiment of the present disclosure;

FIG. 4 shows a schematic diagram of a urea injection quantity test system provided according to an embodiment of the present application;

FIG. 5 is a flow chart illustrating yet another urea injection control method according to an embodiment of the present application;

fig. 6 shows a block diagram of a control device for urea injection quantity according to an embodiment of the present application.

Wherein the above figures include the following reference numerals:

10. a first acquisition unit; 20. a second acquisition unit; 30. an adjusting unit; 11. a constant temperature box; 12. a urea tank; 13. a fan control console; 14. an electric heating machine; 15. a refrigerating machine; 16. a cooling water pump; 17. a urea pump; 18. a urea nozzle; 19. urea injection quantity measuring instrument; 21. an ECU; 22. a personal computer; 102. a processor; 104. a memory; 106. a transmission device; 108. and an input/output device.

Detailed Description

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application 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 application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application 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 in order to describe the embodiments of the application 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.

For convenience of description, the following will describe some terms or terminology involved in the embodiments of the present application:

selective catalytic reduction device: selective Catalytic Reduction, SCR for reducing NO in diesel and HPDI engines _x And (5) discharging.

As described in the background art, when the existing rotational flow atomizing nozzle is used for spraying, gas nuclei are easy to generate at the center of a liquid beam, and the viscosity of urea solution is changed greatly along with the change of temperature, so that the change of the gas nuclei at the center of the liquid beam is caused, the accuracy of urea spraying amount is influenced, and in order to solve the problem that the rotational flow atomizing nozzle is influenced greatly by the temperature, the urea spraying amount is lower in accuracy, the embodiment of the application provides a urea spraying amount control method, a urea spraying amount control device, a computer-readable storage medium and electronic equipment.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application.

The method embodiments provided in the embodiments of the present application may be performed in a mobile terminal, a computer terminal or similar computing device. Taking the operation on a mobile terminal as an example, fig. 1 is a block diagram of a hardware structure of a mobile terminal according to a control method of urea injection quantity according to an embodiment of the present application. As shown in fig. 1, a mobile terminal may include one or more (only one is shown in fig. 1) processors 102 (the processor 102 may include, but is not limited to, a microprocessor MCU or a processing device such as a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 for communication functions and an input-output device 108. It will be appreciated by those skilled in the art that the structure shown in fig. 1 is merely illustrative and not limiting of the structure of the mobile terminal described above. For example, the mobile terminal may also include more or fewer components than shown in fig. 1, or have a different configuration than shown in fig. 1.

The memory 104 may be used to store a computer program, for example, a software program of application software and a module, such as a computer program corresponding to a method for controlling urea injection amount in an embodiment of the present invention, and the processor 102 executes the computer program stored in the memory 104 to perform various functional applications and data processing, that is, implement the above-mentioned method. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory remotely located relative to the processor 102, which may be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or transmit data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, simply referred to as NIC) that can connect to other network devices through a base station to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module, which is configured to communicate with the internet wirelessly.

In the present embodiment, a control method of urea injection amount operating on a mobile terminal, a computer terminal, or the like is provided, and it is to be noted that the steps shown in the flowchart of the drawing may be executed in a computer system such as a set of computer executable instructions, and that although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in an order different from that shown herein.

FIG. 2 is a flow chart of a method of controlling urea injection quantity according to an embodiment of the present application. As shown in fig. 2, the method comprises the steps of:

step S201, acquiring real temperature and real urea injection quantity of urea aqueous solution in real time, wherein the real temperature of the urea aqueous solution is the temperature of the urea aqueous solution at the current moment, and the real urea injection quantity is the mass of urea really injected by a swirl atomizing nozzle at the current moment;

specifically, the urea nozzle is a core part in the SCR aftertreatment system of the diesel engine or the HPDI engine, along with the improvement of emission regulations and the improvement of the thermal efficiency of the diesel engine, higher requirements are put on the spray particle size of the urea nozzle, and in order to realize smaller spray particle size, a swirl atomization nozzle appears, so that the urea aqueous solution is atomized better by utilizing the rotation centrifugal force.

As gas nuclei are easy to generate at the center of the liquid beam when the rotational flow atomizing nozzle sprays, the viscosity of the urea solution is greatly changed along with the change of the temperature, so that the gas nuclei at the center of the liquid beam are changed, and the accuracy of urea spraying quantity is affected. Urea injection quantityPoor accuracy can lead to NO _x Or NH ₃ The increase of pollutant emission does not meet the standard emission requirement, and the environment is polluted. In general, the temperature increases, and the gas core that liquid beam center produced can grow when the whirl atomizing nozzle sprays to lead to the urea injection volume of spraying to reduce, and the temperature reduces, and the gas core that liquid beam center produced can become little when the whirl atomizing nozzle sprays, thereby leads to the urea injection volume of spraying to rise, consequently, in order to prevent that temperature variation from causing great influence to the injection volume of whirl atomizing nozzle, need real-time supervision urea aqueous solution's temperature, under the condition that urea aqueous solution's temperature does not accord with standard temperature, in time take corresponding adjustment measure to adjust the urea injection volume of whirl atomizing nozzle, in order to ensure that the urea injection volume of whirl atomizing nozzle remains at standard injection volume all the time.

The most basic function of the urea solution for the automobile is to convert nitrogen oxides in the automobile exhaust into harmless nitrogen and water, so that the urea solution for the automobile is energy-saving and environment-friendly, and the automobile reaches the national exhaust emission standard. Through the intelligent control of SCR system, when the urea solution in the trucd mixer storage tank is not enough, the trucd mixer can not start. To ensure proper running of the truck, sufficient urea solution should be prepared. The urea for the vehicle is a necessary product for the heavy diesel vehicle to meet the national fourth emission standard. The vehicle urea is urea aqueous solution with urea concentration of 32.5%, and the solvent is ultrapure water. The raw materials are special raw materials for urea and ultrapure water for vehicles. The urea solution for vehicles can optimize engine and fuel consumption and reduce diesel consumption by up to 6%. In contrast, when the urea solution is not added, the urea nozzle is easily oxidized in a high-temperature environment in the exhaust pipe for a long period of time, and the urea solution needs to be circulated and cooled. Insufficient cooling can lead to urea nozzle damage, leads to vehicle exhaust pipe jam, and vehicle power is insufficient, and deep stepping on the throttle can increase the oil consumption. The total cost is far higher than the use cost of the urea solution for vehicles. Therefore, in order to reduce the cost, the urea in the present embodiment may be a vehicular urea solution.

Step S202, obtaining a reference urea injection quantity, wherein the reference urea injection quantity is the mass of urea sprayed by the swirl atomizing nozzle when the exhaust emission of an engine meets the standard emission;

specifically, it is necessary to determine the reference urea injection amount of the swirl atomizing nozzle from the standard emission amount, and in the case where the injection amount of the swirl atomizing nozzle is the reference urea injection amount, the emission amount of the engine conforms to the standard emission amount, and therefore the injection amount of the swirl atomizing nozzle is controlled so that the injection amount of the swirl atomizing nozzle is always maintained at the reference urea injection amount.

And step S203, adjusting the injection duty ratio of the swirl atomizing nozzle and/or the injection pressure of the swirl atomizing nozzle according to at least the real temperature of the urea aqueous solution so that the real urea injection amount is the same as the reference urea injection amount, wherein the injection duty ratio of the swirl atomizing nozzle is the duty ratio of an injection valve of the swirl atomizing nozzle.

Specifically, the correction of the injection quantity of the swirl atomizing nozzle under different urea water solution temperatures is realized through the optimization of an injection strategy; for the case of lower temperature, the correction is accomplished by only reducing the duty cycle; and under the condition of higher temperature, different injection quantity correction strategies are carried out by adopting a duty ratio signal, so that the influence of temperature on the injection quantity of the swirl atomizing nozzle can be reduced, and the urea injection quantity precision of the swirl atomizing nozzle under different temperatures can be ensured.

As shown in fig. 3, the specific implementation steps of adjusting the injection duty ratio of the swirl atomizing nozzle according to at least the actual temperature of the urea aqueous solution so that the actual urea injection amount is the same as the reference urea injection amount are as follows:

step S301, when the real temperature of the urea aqueous solution is smaller than the preset temperature, the injection duty ratio of the swirl atomizing nozzle is reduced until the real urea injection amount is equal to the reference urea injection amount;

step S302, when the real temperature of the urea aqueous solution is greater than the preset temperature and the injection duty ratio of the swirl atomizing nozzle is smaller than the preset duty ratio, the injection duty ratio of the swirl atomizing nozzle is increased until the real urea injection amount is equal to the reference urea injection amount or until the injection duty ratio of the swirl atomizing nozzle reaches the preset duty ratio.

Specifically, the preset temperature is typically 25 ℃ at normal temperature, the preset duty ratio is typically 90%, and the preset duty ratio can also be set between 90% and 100%, and in general, the temperature of the urea aqueous solution corresponding to the standard urea injection amount is typically 25 ℃ at normal temperature. Before entering the actual application scene, a test experiment is carried out, and the test experiment shows that once the temperature of the urea aqueous solution changes, the actual urea injection quantity also changes, so that the actual urea injection quantity can be directly obtained without judging the actual urea injection quantity in the actual application scene under the premise of the test experiment, namely, the change of the actual urea injection quantity can be directly judged only according to the temperature change. The conclusion that the temperature is increased, the urea injection quantity sprayed by the rotational flow atomizing nozzle is reduced, the temperature is reduced and the urea injection quantity sprayed by the rotational flow atomizing nozzle is increased obtained through the test experiment is directly applied to the actual scene. And under the condition that the injection duty ratio of the rotational flow atomizing nozzle reaches the preset duty ratio, the injection duty ratio reaches the maximum duty ratio, and the injection duty ratio cannot be increased continuously, so that the injection duty ratio of the rotational flow atomizing nozzle can be increased only under the condition that the injection duty ratio of the rotational flow atomizing nozzle is smaller than the preset duty ratio. The method can reduce the influence of temperature on the injection quantity of the swirl atomizing nozzle, corrects the urea injection quantity from the angle of duty ratio correction, effectively improves the injection precision of the swirl atomizing nozzle, and solves the problem of lower urea injection quantity precision caused by larger influence of temperature on the swirl atomizing nozzle.

Wherein, at least according to the true temperature of the urea aqueous solution, the injection pressure of the swirl atomizing nozzle is adjusted so that the actual urea injection quantity is the same as the reference urea injection quantity, and the specific implementation steps are as follows:

step S401, when the actual temperature of the urea aqueous solution is greater than a preset temperature and the injection duty ratio of the swirl atomizing nozzle is greater than or equal to the preset duty ratio, increasing the injection pressure of the swirl atomizing nozzle until the actual urea injection amount is equal to the reference urea injection amount.

Specifically, in the case where the injection duty ratio is greater than or equal to the preset duty ratio, it is proved that the injection duty ratio is already the maximum duty ratio, and at this time, if the urea injection amount is still smaller than the reference urea injection amount, the actual urea injection amount cannot be increased by increasing the injection duty ratio any more, so that the urea injection amount can be increased only by adjusting other parameters, and the injection pressure is the parameter that most effectively adjusts the urea injection amount. Under the condition that the injection duty ratio reaches a peak value, the urea injection quantity can be continuously regulated by regulating the injection pressure, so that the injection precision of the swirl atomizing nozzle is effectively improved, and the problem that the precision of the urea injection quantity is lower due to the fact that the swirl atomizing nozzle is greatly influenced by temperature is solved.

Under the condition that the real temperature of the urea aqueous solution is greater than a preset temperature and the injection duty ratio of the swirl atomizing nozzle is greater than or equal to the preset duty ratio, increasing the injection pressure of the swirl atomizing nozzle until the real urea injection amount is equal to the reference urea injection amount, wherein the implementation steps are as follows:

step S4011, obtaining a target difference value and/or a target ratio, wherein the target difference value is a difference value between the real temperature of the urea aqueous solution and the preset temperature, and the target ratio is a ratio between the real temperature of the urea aqueous solution and the preset temperature;

step S4012, determining a pressure adjustment coefficient according to the target difference value and/or the target ratio;

step S4013, increasing the injection pressure of the swirl atomizing nozzle according to the pressure adjustment coefficient until the actual urea injection amount is equal to the reference urea injection amount.

Specifically, the degree of adjustment of the injection pressure is determined according to the degree of change in temperature, for example: in the case where the actual temperature is 5% greater than the preset temperature, the injection pressure is adjusted to a pressure 5% greater than that in the normal case, so that the urea injection amount can be adjusted to the reference injection amount more accurately.

Wherein, at least according to the true temperature of the urea aqueous solution, the spray duty ratio of the swirl atomizing nozzle is adjusted, so that the actual urea spray amount is the same as the reference urea spray amount, and the specific implementation steps are as follows:

step S501, obtaining a target difference value and/or a target ratio, wherein the target difference value is a difference value between the real temperature of the urea aqueous solution and a preset temperature, and the target ratio is a ratio between the real temperature of the urea aqueous solution and the preset temperature;

step S502, determining a duty ratio adjustment coefficient according to the target difference value and/or the target ratio;

step S503, according to the duty ratio adjustment coefficient, adjusting the injection duty ratio of the rotational flow atomizing nozzle until the real urea injection amount is equal to the reference urea injection amount, or until the injection duty ratio of the rotational flow atomizing nozzle reaches a preset duty ratio.

Specifically, the degree of adjustment of the injection duty ratio is determined according to the degree of change in temperature, for example: in the case where the actual temperature is 5% greater than the preset temperature, the injection duty cycle is adjusted to a pressure 5% greater than normal, or in the case where the actual temperature is 5% less than the preset temperature, the injection duty cycle is adjusted to a 5% less than normal, so that the urea injection amount can be adjusted to the reference injection amount more accurately.

Wherein, at least according to the real temperature of the urea aqueous solution, the spray duty ratio of the swirl atomizing nozzle and/or the spray pressure of the swirl atomizing nozzle are/is adjusted, so that the real urea spray amount is the same as the reference urea spray amount, and the specific implementation steps are as follows:

step S601, acquiring an injection quantity correction model, wherein the input of the injection quantity correction model is the real temperature of the urea aqueous solution, the injection duty ratio of the swirl atomizing nozzle and the injection pressure of the swirl atomizing nozzle, the output of the injection quantity correction model is the urea injection quantity, the injection quantity correction model is obtained by training a neural network structure by using multiple sets of training data, and each set of training data in the multiple sets of training data comprises training data acquired in a historical time period: the true temperature of the urea aqueous solution, the injection duty ratio of the swirl atomizing nozzle, and the injection pressure of the swirl atomizing nozzle, and the injection quantity correction model is related to at least the aspect ratio of the swirl atomizing nozzle and the swirl chamber diameter of the swirl atomizing nozzle;

step S602, according to the actual temperature of the urea aqueous solution and the injection quantity correction model, adjusting the injection duty ratio of the swirl atomizing nozzle and/or the injection pressure of the swirl atomizing nozzle so that the actual urea injection quantity is the same as the reference urea injection quantity.

Specifically, the injection quantity correction model may be obtained through a preliminary test experiment. As shown in fig. 4, an injection amount test experiment is performed by using a urea injection amount test system, and the urea injection amount test system specifically includes: incubator 11, refrigerating apparatus (refrigerant 15 and cooling water pump 16), heating apparatus (fan console 13 and electric heat machine 14), injection system (urea tank 12, urea pump 17, urea pipe, urea nozzle 18, urea aqueous solution temperature sensor, etc.), control system (personal computer 22 (e.g., notebook computer), ECU21, whole vehicle simulation box, INCA software), weighing system (balance or urea injection quantity measuring instrument 19, sampling bag or sampling bottle), and the like. The urea box is placed in the constant temperature box, the refrigerating device and the heating device are controlled by the control system to change the temperature of the urea box in the constant temperature box, and the experimental temperature, the urea duty ratio, the urea pressure and the urea injection quantity of the experiment are recorded. The Tianping and urea injection quantity measuring instrument is used for detecting urea injection quantity in one experiment, and the sampling bag and the sampling bottle are used for sampling the sprayed urea.

The specific test experimental steps are as follows: firstly, placing the urea box into an incubator, setting the temperature through the incubator, and then performing injection quantity tests under different urea water solution temperatures to provide test data for a control strategy. The temperature range of the test is from-5 ℃ to 65 ℃ (adjustable) with an interval of 10 ℃ (adjustable); the injection quantity duty ratio is from 10% to 100% (adjustable), and the interval is 10% (adjustable); the injection pressure ranged from 8bar to 10bar (adjustable) with an interval of 0.5bar (adjustable). Each operating point was continuously sprayed for 3 minutes (to spray a sufficient amount of urea to improve the accuracy of the experiment), sampled by a sampling bag or beaker, and then urea spray values were obtained by a balance.

According to the test experiment, an injection quantity correction model can be constructed, and according to the injection quantity correction model, the injection duty ratio and the injection pressure can be simultaneously adjusted so as to accurately adjust the urea injection quantity.

Wherein, at least according to the real temperature of the urea aqueous solution, the spray duty ratio of the swirl atomizing nozzle and/or the spray pressure of the swirl atomizing nozzle are/is adjusted so that the real urea spray amount is the same as the reference urea spray amount, and the method further comprises the following steps:

step S701, when the real temperature of the urea aqueous solution is smaller than a preset temperature and the real urea injection amount is larger than the reference urea injection amount, the injection duty ratio of the swirl atomizing nozzle is reduced until the real urea injection amount is equal to the reference urea injection amount;

step S702, when the actual temperature of the urea aqueous solution is greater than the preset temperature, the actual urea injection amount is less than the reference urea injection amount, and the injection duty ratio of the swirl atomizing nozzle is less than the preset duty ratio, increasing the injection duty ratio of the swirl atomizing nozzle until the actual urea injection amount is equal to the reference urea injection amount, or until the injection duty ratio of the swirl atomizing nozzle reaches the preset duty ratio;

In step S703, when the actual temperature of the urea aqueous solution is greater than the preset temperature, the actual urea injection amount is less than the reference urea injection amount, and the injection duty ratio of the swirl atomizing nozzle is greater than or equal to the preset duty ratio, the injection pressure of the swirl atomizing nozzle is increased until the actual urea injection amount is equal to the reference urea injection amount.

Specifically, in some schemes, a urea injection amount sensor capable of detecting a real urea injection amount may be installed in the engine, so that the urea injection amount may be detected in real time, and the injection duty ratio and the injection pressure may be adjusted according to both changes in temperature and the real urea injection amount, so that the accuracy of adjustment may be improved by detecting the urea injection amount in real time.

According to the control method of the urea injection quantity, the real temperature of the urea aqueous solution and the real urea injection quantity are obtained in real time, wherein the real temperature of the urea aqueous solution is the temperature of the urea aqueous solution at the current moment, and the real urea injection quantity is the mass of the urea really injected by the swirl atomizing nozzle at the current moment; then, acquiring a reference urea injection quantity which is the mass of urea sprayed by a rotational flow atomizing nozzle when the tail gas emission quantity of the engine meets the standard emission quantity; finally, according to at least the real temperature of the urea aqueous solution, the injection duty ratio of the rotational flow atomizing nozzle and/or the injection pressure of the rotational flow atomizing nozzle are/is adjusted so that the real urea injection quantity is the same as the reference urea injection quantity, and the injection duty ratio of the rotational flow atomizing nozzle is the duty ratio of an injection valve of the rotational flow atomizing nozzle. According to the method, the spray quantity of the swirl atomizing nozzle at different urea water solution temperatures is corrected through optimizing an injection strategy; for the case of lower temperature, the correction is accomplished by only reducing the duty cycle; for the condition of higher temperature, different injection quantity correction strategies are carried out by adopting a duty ratio signal, so that the injection precision of the cyclone atomization nozzle is effectively improved, and the problem of lower urea injection quantity precision caused by the fact that the cyclone atomization nozzle is greatly influenced by temperature is solved.

In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of the urea injection quantity control method of the present application will be described in detail with reference to specific embodiments.

The embodiment relates to a specific urea injection quantity control method, as shown in fig. 5, comprising the following steps:

step S1: firstly, injection pressure and duty ratio correction coefficients under different working conditions are obtained through urea injection quantity tests. Wherein, different working conditions refer to different temperatures, different injection duty ratios and different injection pressures, and the correction coefficient refers to an adjustment coefficient for adjusting the injection duty ratio and the injection pressure, wherein the adjustment coefficient is used for correcting the real injection quantity to the reference injection quantity under the current working condition;

step S2: if the temperature of the urea aqueous solution is less than or equal to 25 ℃ at normal temperature, the urea injection quantity is greater than the normal temperature value, and the injection quantity can be adjusted by reducing the injection duty ratio.

Step S3: if the temperature is greater than the normal temperature of 25 ℃, the urea injection quantity is smaller than or equal to the normal temperature value, and corresponding injection quantity correction can be performed according to the injection duty ratio range: if the ECU injection quantity duty ratio signal is not more than 90%, urea injection quantity correction is carried out by increasing the duty ratio; if the injection amount duty ratio signal is greater than 90%, it is difficult to supplement the urea injection amount by continuously increasing the injection amount duty ratio, and at this time, the urea injection amount loss due to the temperature increase needs to be supplemented by increasing the injection pressure.

It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.

The embodiment of the application also provides a urea injection quantity control device, and the urea injection quantity control device can be used for executing the urea injection quantity control method provided by the embodiment of the application. The device is used for realizing the above embodiments and preferred embodiments, and is not described in detail. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

The following describes a urea injection quantity control device provided in an embodiment of the present application.

Fig. 6 is a schematic diagram of a control apparatus for urea injection quantity according to an embodiment of the present application. As shown in fig. 6, the device comprises a first obtaining unit 10, a second obtaining unit 20 and an adjusting unit 30, wherein the first obtaining unit 10 is used for obtaining the real temperature of the urea aqueous solution and the real urea injection quantity in real time, the real temperature of the urea aqueous solution is the temperature of the urea aqueous solution at the current moment, and the real urea injection quantity is the mass of the urea actually sprayed by the swirl atomizing nozzle at the current moment; the second obtaining unit 20 is configured to obtain a reference urea injection amount, where the reference urea injection amount is a mass of urea injected from the swirl atomizing nozzle when an exhaust emission of the engine meets a standard emission; the adjusting unit 30 is configured to adjust an injection duty ratio of the swirling atomizing nozzle and/or an injection pressure of the swirling atomizing nozzle so that the actual urea injection amount is the same as the reference urea injection amount, based on at least the actual temperature of the urea aqueous solution, the injection duty ratio of the swirling atomizing nozzle being a duty ratio of an injection valve of the swirling atomizing nozzle.

The control device for the urea injection quantity comprises a first acquisition unit, a second acquisition unit and an adjustment unit, wherein the first acquisition unit is used for acquiring the real temperature of the urea aqueous solution and the real urea injection quantity in real time, the real temperature of the urea aqueous solution is the temperature of the urea aqueous solution at the current moment, and the real urea injection quantity is the mass of urea which is really sprayed out by a swirl atomization nozzle at the current moment; the second acquisition unit is used for acquiring a reference urea injection quantity, wherein the reference urea injection quantity is the mass of urea sprayed by the swirl atomization nozzle when the tail gas emission quantity of the engine meets the standard emission quantity; the adjusting unit is used for adjusting the injection duty ratio of the rotational flow atomizing nozzle and/or the injection pressure of the rotational flow atomizing nozzle at least according to the real temperature of the urea aqueous solution so that the real urea injection quantity is the same as the reference urea injection quantity, and the injection duty ratio of the rotational flow atomizing nozzle is the duty ratio of an injection valve of the rotational flow atomizing nozzle. The device realizes the correction of the injection quantity of the rotational flow atomizing nozzle under different urea water solution temperatures through the optimization of an injection strategy; for the case of lower temperature, the correction is accomplished by only reducing the duty cycle; for the condition of higher temperature, different injection quantity correction strategies are carried out by adopting a duty ratio signal, so that the injection precision of the cyclone atomization nozzle is effectively improved, and the problem of lower urea injection quantity precision caused by the fact that the cyclone atomization nozzle is greatly influenced by temperature is solved.

As an alternative example, the adjusting unit includes a first adjusting module and a second adjusting module, where the first adjusting module is configured to reduce the injection duty ratio of the swirl atomizing nozzle until the actual urea injection amount is equal to the reference urea injection amount when the actual temperature of the urea aqueous solution is less than a preset temperature; the second adjusting module is configured to increase the injection duty ratio of the swirling atomizing nozzle when the real temperature of the urea aqueous solution is greater than the preset temperature and the injection duty ratio of the swirling atomizing nozzle is less than the preset duty ratio, until the real urea injection amount is equal to the reference urea injection amount or until the injection duty ratio of the swirling atomizing nozzle reaches the preset duty ratio. The influence of temperature on the injection quantity of the swirl atomizing nozzle can be reduced, the urea injection quantity is corrected from the angle of duty ratio correction, the injection precision of the swirl atomizing nozzle is effectively improved, and the problem that the urea injection quantity precision is lower due to the fact that the swirl atomizing nozzle is greatly influenced by the temperature is solved.

In an alternative example, the adjusting unit includes a third adjusting module, where the third adjusting module is configured to increase the injection pressure of the swirl atomizing nozzle until the actual urea injection amount is equal to the reference urea injection amount when the actual temperature of the urea aqueous solution is greater than a preset temperature and the injection duty cycle of the swirl atomizing nozzle is greater than or equal to the preset duty cycle. Under the condition that the injection duty ratio reaches a peak value, the urea injection quantity can be continuously regulated by regulating the injection pressure, the injection precision of the swirl atomizing nozzle is effectively improved, and the problem that the precision of the urea injection quantity is lower due to the fact that the swirl atomizing nozzle is greatly influenced by temperature is solved.

The third adjusting module includes an obtaining sub-module, a determining sub-module, and an adjusting sub-module, where the obtaining sub-module is configured to obtain a target difference and/or a target ratio, where the target difference is a difference between the actual temperature of the urea aqueous solution and the preset temperature, and the target ratio is a ratio between the actual temperature of the urea aqueous solution and the preset temperature; the determining submodule is used for determining a pressure adjusting coefficient according to the target difference value and/or the target ratio; the regulating submodule is used for increasing the injection pressure of the swirl atomizing nozzle according to the pressure regulating coefficient until the actual urea injection quantity is equal to the reference urea injection quantity. The urea injection quantity can be more accurately adjusted to the reference injection quantity.

In this embodiment, the adjusting unit includes a first obtaining module, a first determining module, and a fourth adjusting module, where the first obtaining module is configured to obtain a target difference and/or a target ratio, where the target difference is a difference between a real temperature of the urea aqueous solution and a preset temperature, and the target ratio is a ratio between the real temperature of the urea aqueous solution and the preset temperature; the first determining module is used for determining a duty ratio adjusting coefficient according to the target difference value and/or the target ratio; and the fourth adjusting module is used for adjusting the injection duty ratio of the rotational flow atomizing nozzle according to the duty ratio adjusting coefficient until the real urea injection quantity is equal to the reference urea injection quantity or until the injection duty ratio of the rotational flow atomizing nozzle reaches a preset duty ratio. Thus, the urea injection quantity can be more accurately regulated to the reference injection quantity.

An optional solution, the adjusting unit includes a second obtaining module and a fifth adjusting module, where the second obtaining module is configured to obtain an injection quantity correction model, an input of the injection quantity correction model is a true temperature of the urea aqueous solution, an injection duty cycle of the swirl atomizing nozzle, and an injection pressure of the swirl atomizing nozzle, an output of the injection quantity correction model is the urea injection quantity, the injection quantity correction model is obtained by training a neural network structure using multiple sets of training data, and each set of training data in the multiple sets of training data includes an obtained historical time period: the true temperature of the urea aqueous solution, the injection duty ratio of the swirl atomizing nozzle, and the injection pressure of the swirl atomizing nozzle, and the injection quantity correction model is related to at least the aspect ratio of the swirl atomizing nozzle and the swirl chamber diameter of the swirl atomizing nozzle; and the fifth adjusting module is used for adjusting the injection duty ratio of the swirl atomizing nozzle and/or the injection pressure of the swirl atomizing nozzle according to the real temperature of the urea aqueous solution and the injection quantity correction model so that the real urea injection quantity is the same as the reference urea injection quantity. An injection quantity correction model can be constructed, and according to the injection quantity correction model, the injection duty ratio and the injection pressure can be simultaneously adjusted so as to accurately adjust the urea injection quantity.

As an alternative scheme, the adjusting unit includes a sixth adjusting module, a seventh adjusting module and an eighth adjusting module, where the sixth adjusting module is configured to reduce the injection duty ratio of the swirl atomizing nozzle until the actual urea injection amount is equal to the reference urea injection amount when the actual temperature of the urea aqueous solution is less than a preset temperature and the actual urea injection amount is greater than the reference urea injection amount; the seventh adjusting module is configured to increase the injection duty ratio of the swirl atomizing nozzle until the actual urea injection amount is equal to the reference urea injection amount or until the injection duty ratio of the swirl atomizing nozzle reaches the preset duty ratio when the actual urea injection amount is greater than the preset temperature and the actual urea injection amount is less than the reference urea injection amount and the injection duty ratio of the swirl atomizing nozzle is less than the preset duty ratio; the eighth adjusting module is configured to increase an injection pressure of the swirl atomizing nozzle until the actual urea injection amount is equal to the reference urea injection amount when the actual temperature of the urea aqueous solution is greater than the preset temperature, the actual urea injection amount is less than the reference urea injection amount, and the injection duty ratio of the swirl atomizing nozzle is greater than or equal to the preset duty ratio. The accuracy of the adjustment can be improved by detecting the urea injection quantity in real time.

The control device for urea injection quantity comprises a processor and a memory, wherein the first acquisition unit and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions. The modules are all located in the same processor; alternatively, the above modules may be located in different processors in any combination.

The processor includes a kernel, and the kernel fetches the corresponding program unit from the memory. The inner core can be provided with one or more than one, and the problem that the accuracy of urea injection quantity is low due to the fact that the swirl atomizing nozzle is greatly influenced by temperature is solved by adjusting the parameters of the inner core.

The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.

The embodiment of the invention provides a computer readable storage medium, which comprises a stored program, wherein the program is used for controlling equipment where the computer readable storage medium is positioned to execute a control method of the urea injection quantity.

Specifically, the control method of the urea injection quantity comprises the following steps:

Optionally, adjusting the injection duty ratio of the swirl atomizing nozzle so that the actual urea injection amount is the same as the reference urea injection amount at least according to the actual temperature of the urea aqueous solution, including: reducing the spray duty ratio of the swirl atomizing nozzle until the actual urea spray amount is equal to the reference urea spray amount under the condition that the actual temperature of the urea aqueous solution is smaller than a preset temperature; and under the condition that the real temperature of the urea aqueous solution is larger than the preset temperature and the injection duty ratio of the swirl atomizing nozzle is smaller than the preset duty ratio, increasing the injection duty ratio of the swirl atomizing nozzle until the real urea injection amount is equal to the reference urea injection amount or until the injection duty ratio of the swirl atomizing nozzle reaches the preset duty ratio.

Optionally, adjusting the injection pressure of the swirl atomizing nozzle at least according to the actual temperature of the urea aqueous solution so that the actual urea injection amount is the same as the reference urea injection amount, including: and under the condition that the real temperature of the urea aqueous solution is larger than a preset temperature and the injection duty ratio of the swirl atomizing nozzle is larger than or equal to the preset duty ratio, increasing the injection pressure of the swirl atomizing nozzle until the real urea injection amount is equal to the reference urea injection amount.

Optionally, when the actual temperature of the urea aqueous solution is greater than a preset temperature and the injection duty ratio of the swirl atomizing nozzle is greater than or equal to the preset duty ratio, increasing the injection pressure of the swirl atomizing nozzle until the actual urea injection amount is equal to the reference urea injection amount, including: obtaining a target difference value and/or a target ratio, wherein the target difference value is a difference value between the real temperature of the urea aqueous solution and the preset temperature, and the target ratio is a ratio between the real temperature of the urea aqueous solution and the preset temperature; determining a pressure regulating coefficient according to the target difference value and/or the target ratio; and increasing the injection pressure of the swirl atomizing nozzle according to the pressure regulating coefficient until the actual urea injection quantity is equal to the reference urea injection quantity.

Optionally, adjusting the injection duty ratio of the swirl atomizing nozzle so that the actual urea injection amount is the same as the reference urea injection amount at least according to the actual temperature of the urea aqueous solution, including: obtaining a target difference value and/or a target ratio, wherein the target difference value is a difference value between the real temperature of the urea aqueous solution and a preset temperature, and the target ratio is a ratio between the real temperature of the urea aqueous solution and the preset temperature; determining a duty cycle adjustment coefficient according to the target difference value and/or the target ratio; and adjusting the injection duty ratio of the swirl atomizing nozzle according to the duty ratio adjusting coefficient until the real urea injection amount is equal to the reference urea injection amount or until the injection duty ratio of the swirl atomizing nozzle reaches a preset duty ratio.

Optionally, adjusting the injection duty ratio of the swirl atomizing nozzle and/or the injection pressure of the swirl atomizing nozzle so that the actual urea injection amount is the same as the reference urea injection amount at least according to the actual temperature of the urea aqueous solution, including: obtaining an injection quantity correction model, wherein the input of the injection quantity correction model is the real temperature of the urea aqueous solution, the injection duty ratio of the rotational flow atomizing nozzle and the injection pressure of the rotational flow atomizing nozzle, the output of the injection quantity correction model is the urea injection quantity, the injection quantity correction model is obtained by training a neural network structure by using a plurality of sets of training data, and each set of training data in the plurality of sets of training data comprises the data acquired in a historical time period: the true temperature of the urea aqueous solution, the injection duty ratio of the swirl atomizing nozzle, and the injection pressure of the swirl atomizing nozzle, and the injection quantity correction model is related to at least the aspect ratio of the swirl atomizing nozzle and the swirl chamber diameter of the swirl atomizing nozzle; and adjusting the injection duty ratio of the swirl atomizing nozzle and/or the injection pressure of the swirl atomizing nozzle according to the actual temperature of the urea aqueous solution and the injection quantity correction model so that the actual urea injection quantity is the same as the reference urea injection quantity.

Optionally, adjusting the injection duty ratio of the swirl atomizing nozzle and/or the injection pressure of the swirl atomizing nozzle so that the actual urea injection amount is the same as the reference urea injection amount at least according to the actual temperature of the urea aqueous solution, including: the spray duty ratio of the swirl atomizing nozzle is reduced until the real urea injection amount is equal to the reference urea injection amount under the condition that the real temperature of the urea aqueous solution is smaller than the preset temperature and the real urea injection amount is larger than the reference urea injection amount; when the real temperature of the urea aqueous solution is higher than the preset temperature, the real urea injection amount is lower than the reference urea injection amount, and the injection duty ratio of the swirl atomizing nozzle is lower than the preset duty ratio, increasing the injection duty ratio of the swirl atomizing nozzle until the real urea injection amount is equal to the reference urea injection amount, or until the injection duty ratio of the swirl atomizing nozzle reaches the preset duty ratio; and when the real temperature of the urea aqueous solution is higher than the preset temperature, the real urea injection amount is lower than the reference urea injection amount, and the injection duty ratio of the swirl atomizing nozzle is higher than or equal to the preset duty ratio, increasing the injection pressure of the swirl atomizing nozzle until the real urea injection amount is equal to the reference urea injection amount.

The embodiment of the invention provides a processor which is used for running a program, wherein the control method of the urea injection quantity is executed when the program runs.

The embodiment of the invention provides equipment, which comprises a processor, a memory and a program stored in the memory and capable of running on the processor, wherein the processor realizes at least the following steps when executing the program:

The device herein may be a server, PC, PAD, cell phone, etc.

The application also provides a computer program product adapted to perform, when executed on a data processing device, a program initialized with at least the following method steps:

It will be appreciated by those skilled in the art that the modules or steps of the application described above may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, they may be implemented in program code executable by computing devices, so that they may be stored in a storage device for execution by computing devices, and in some cases, the steps shown or described may be performed in a different order than that shown or described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps of them may be fabricated into a single integrated circuit module. Thus, the present application is not limited to any specific combination of hardware and software.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.

From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

1) According to the control method of the urea injection quantity, the real temperature of the urea aqueous solution and the real urea injection quantity are obtained in real time, wherein the real temperature of the urea aqueous solution is the temperature of the urea aqueous solution at the current moment, and the real urea injection quantity is the mass of the urea really injected by the swirl atomizing nozzle at the current moment; then, acquiring a reference urea injection quantity which is the mass of urea sprayed by a rotational flow atomizing nozzle when the tail gas emission quantity of the engine meets the standard emission quantity; finally, according to at least the real temperature of the urea aqueous solution, the injection duty ratio of the rotational flow atomizing nozzle and/or the injection pressure of the rotational flow atomizing nozzle are/is adjusted so that the real urea injection quantity is the same as the reference urea injection quantity, and the injection duty ratio of the rotational flow atomizing nozzle is the duty ratio of an injection valve of the rotational flow atomizing nozzle. According to the method, the spray quantity of the swirl atomizing nozzle at different urea water solution temperatures is corrected through optimizing an injection strategy; for the case of lower temperature, the correction is accomplished by only reducing the duty cycle; for the condition of higher temperature, different injection quantity correction strategies are carried out by adopting a duty ratio signal, so that the injection precision of the cyclone atomization nozzle is effectively improved, and the problem of lower urea injection quantity precision caused by the fact that the cyclone atomization nozzle is greatly influenced by temperature is solved.

2) The control device for the urea injection quantity comprises a first acquisition unit, a second acquisition unit and an adjustment unit, wherein the first acquisition unit is used for acquiring the real temperature of the urea aqueous solution and the real urea injection quantity in real time, the real temperature of the urea aqueous solution is the temperature of the urea aqueous solution at the current moment, and the real urea injection quantity is the mass of urea actually sprayed by the swirl atomizing nozzle at the current moment; the second acquisition unit is used for acquiring a reference urea injection quantity, wherein the reference urea injection quantity is the mass of urea sprayed by the swirl atomization nozzle when the tail gas emission quantity of the engine meets the standard emission quantity; the adjusting unit is used for adjusting the injection duty ratio of the rotational flow atomizing nozzle and/or the injection pressure of the rotational flow atomizing nozzle at least according to the real temperature of the urea aqueous solution so that the real urea injection quantity is the same as the reference urea injection quantity, and the injection duty ratio of the rotational flow atomizing nozzle is the duty ratio of an injection valve of the rotational flow atomizing nozzle. The device realizes the correction of the injection quantity of the rotational flow atomizing nozzle under different urea water solution temperatures through the optimization of an injection strategy; for the case of lower temperature, the correction is accomplished by only reducing the duty cycle; for the condition of higher temperature, different injection quantity correction strategies are carried out by adopting a duty ratio signal, so that the injection precision of the cyclone atomization nozzle is effectively improved, and the problem of lower urea injection quantity precision caused by the fact that the cyclone atomization nozzle is greatly influenced by temperature is solved.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for controlling an injection amount of urea, comprising:

acquiring the real temperature of the urea aqueous solution and the real urea injection quantity in real time, wherein the real temperature of the urea aqueous solution is the temperature of the urea aqueous solution at the current moment, and the real urea injection quantity is the mass of the urea really sprayed by the swirl atomizing nozzle at the current moment;

acquiring a reference urea injection quantity, wherein the reference urea injection quantity is the mass of urea sprayed by the swirl atomizing nozzle when the tail gas emission quantity of an engine meets the standard emission quantity;

and adjusting the injection duty ratio of the swirl atomizing nozzle and/or the injection pressure of the swirl atomizing nozzle at least according to the real temperature of the urea aqueous solution so that the real urea injection amount is the same as the reference urea injection amount, wherein the injection duty ratio of the swirl atomizing nozzle is the duty ratio of an injection valve of the swirl atomizing nozzle.

2. The control method according to claim 1, characterized in that adjusting the injection duty ratio of the swirl atomizing nozzle so that the actual urea injection amount is the same as the reference urea injection amount, at least in accordance with the actual temperature of the urea aqueous solution, comprises:

reducing the spray duty ratio of the swirl atomizing nozzle under the condition that the real temperature of the urea aqueous solution is smaller than a preset temperature until the real urea spray amount is equal to the reference urea spray amount;

and under the condition that the real temperature of the urea aqueous solution is greater than the preset temperature and the injection duty ratio of the rotational flow atomizing nozzle is smaller than the preset duty ratio, increasing the injection duty ratio of the rotational flow atomizing nozzle until the real urea injection amount is equal to the reference urea injection amount or until the injection duty ratio of the rotational flow atomizing nozzle reaches the preset duty ratio.

3. The control method according to claim 1, characterized in that adjusting the injection pressure of the swirl atomizing nozzle so that the actual urea injection amount is the same as the reference urea injection amount, at least in accordance with the actual temperature of the urea aqueous solution, comprises:

And under the condition that the real temperature of the urea aqueous solution is greater than a preset temperature and the injection duty ratio of the rotational flow atomizing nozzle is greater than or equal to the preset duty ratio, increasing the injection pressure of the rotational flow atomizing nozzle until the real urea injection amount is equal to the reference urea injection amount.

4. A control method according to claim 3, characterized in that in the case where the true temperature of the urea aqueous solution is greater than a preset temperature and the injection duty ratio of the swirl atomizing nozzle is greater than or equal to a preset duty ratio, increasing the injection pressure of the swirl atomizing nozzle until the true urea injection amount is equal to the reference urea injection amount, comprises:

obtaining a target difference value and/or a target ratio, wherein the target difference value is a difference value between the real temperature of the urea aqueous solution and the preset temperature, and the target ratio is a ratio between the real temperature of the urea aqueous solution and the preset temperature;

determining a pressure regulating coefficient according to the target difference value and/or the target ratio;

and increasing the injection pressure of the swirl atomizing nozzle according to the pressure regulating coefficient until the real urea injection quantity is equal to the reference urea injection quantity.

5. The control method according to claim 1, characterized in that adjusting the injection duty ratio of the swirl atomizing nozzle so that the actual urea injection amount is the same as the reference urea injection amount, at least in accordance with the actual temperature of the urea aqueous solution, comprises:

obtaining a target difference value and/or a target ratio, wherein the target difference value is a difference value between the real temperature of the urea aqueous solution and a preset temperature, and the target ratio is a ratio between the real temperature of the urea aqueous solution and the preset temperature;

determining a duty cycle adjustment coefficient according to the target difference value and/or the target ratio;

and adjusting the injection duty ratio of the rotational flow atomizing nozzle according to the duty ratio adjusting coefficient until the real urea injection amount is equal to the reference urea injection amount or until the injection duty ratio of the rotational flow atomizing nozzle reaches a preset duty ratio.

6. The control method according to claim 1, characterized in that adjusting the injection duty ratio of the swirling atomizing nozzle and/or the injection pressure of the swirling atomizing nozzle so that the actual urea injection amount is the same as the reference urea injection amount, at least in accordance with the actual temperature of the urea aqueous solution, comprises:

The method comprises the steps of obtaining an injection quantity correction model, wherein the input of the injection quantity correction model is the real temperature of urea aqueous solution, the injection duty ratio of a rotational flow atomizing nozzle and the injection pressure of the rotational flow atomizing nozzle, the output of the injection quantity correction model is the urea injection quantity, the injection quantity correction model is obtained by training a neural network structure by using a plurality of sets of training data, and each set of training data in the plurality of sets of training data comprises the data obtained in a historical time period: the real temperature of the urea aqueous solution, the injection duty ratio of the swirl atomizing nozzle and the injection pressure of the swirl atomizing nozzle, wherein the injection quantity correction model is at least related to the length-diameter ratio of the swirl atomizing nozzle and the diameter of a swirl chamber of the swirl atomizing nozzle;

and adjusting the injection duty ratio of the swirl atomizing nozzle and/or the injection pressure of the swirl atomizing nozzle according to the real temperature of the urea aqueous solution and the injection quantity correction model so that the real urea injection quantity is the same as the reference urea injection quantity.

7. The control method according to claim 1, characterized in that adjusting the injection duty ratio of the swirling atomizing nozzle and/or the injection pressure of the swirling atomizing nozzle so that the actual urea injection amount is the same as the reference urea injection amount, at least in accordance with the actual temperature of the urea aqueous solution, comprises:

When the real temperature of the urea aqueous solution is smaller than a preset temperature and the real urea injection amount is larger than the reference urea injection amount, the injection duty ratio of the swirl atomizing nozzle is reduced until the real urea injection amount is equal to the reference urea injection amount;

increasing the injection duty cycle of the swirl atomizing nozzle until the actual urea injection amount is equal to the reference urea injection amount or until the injection duty cycle of the swirl atomizing nozzle reaches the preset duty cycle under the condition that the actual temperature of the urea aqueous solution is greater than the preset temperature, the actual urea injection amount is smaller than the reference urea injection amount, and the injection duty cycle of the swirl atomizing nozzle is smaller than the preset duty cycle;

and under the condition that the real temperature of the urea aqueous solution is greater than the preset temperature, the real urea injection quantity is smaller than the reference urea injection quantity, and the injection duty ratio of the swirl atomizing nozzle is greater than or equal to the preset duty ratio, increasing the injection pressure of the swirl atomizing nozzle until the real urea injection quantity is equal to the reference urea injection quantity.

8. A method for controlling an injection amount of urea, comprising:

the first acquisition unit is used for acquiring the real temperature of the urea aqueous solution and the real urea injection quantity in real time, wherein the real temperature of the urea aqueous solution is the temperature of the urea aqueous solution at the current moment, and the real urea injection quantity is the mass of the urea really sprayed by the swirl atomizing nozzle at the current moment;

the second acquisition unit is used for acquiring a reference urea injection quantity, wherein the reference urea injection quantity is the mass of urea sprayed by the swirl atomizing nozzle when the tail gas emission quantity of the engine meets the standard emission quantity;

and the adjusting unit is used for adjusting the injection duty ratio of the rotational flow atomizing nozzle and/or the injection pressure of the rotational flow atomizing nozzle at least according to the real temperature of the urea aqueous solution so that the real urea injection quantity is the same as the reference urea injection quantity, and the injection duty ratio of the rotational flow atomizing nozzle is the duty ratio of an injection valve of the rotational flow atomizing nozzle.

9. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a stored program, wherein the program, when run, controls a device in which the computer-readable storage medium is located to execute the control method of the urea injection quantity according to any one of claims 1 to 7.

10. An electronic device, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising a control method for performing the urea injection quantity of any of claims 1-7.