Methods, devices, equipment, and media for determining the primary and exhaust temperatures of diesel engines.

Abstract

This invention discloses a method, apparatus, device, and medium for determining the exhaust temperature of a diesel engine. The method includes: establishing an exhaust temperature model of the target vehicle's diesel engine when the engine is under high load, and determining the turbine inlet temperature model value based on the exhaust temperature model; determining the turbine outlet temperature model value corresponding to the turbine inlet temperature model value based on a pre-established turbine outlet temperature model; acquiring the turbine outlet temperature sensor value measured by the turbine outlet temperature sensor, and inputting the turbine outlet temperature model value and the turbine outlet temperature sensor value into a pre-constructed Kalman filter to obtain the final calculated turbine inlet temperature value. This invention provides a method for quickly and accurately determining the exhaust temperature of a diesel engine.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of engine control technology, and in particular to a method, apparatus, equipment and medium for determining the exhaust temperature of a diesel engine. Background Technology

[0002] With the continuous progress and development of technology, cars have become an essential means of transportation for almost every family, bringing great convenience to people's lives.

[0003] Internal combustion engines generate power through fuel combustion. According to the second law of thermodynamics, no heat engine can convert 100% of chemical energy into mechanical energy; a considerable portion is converted into heat energy. A portion of this energy is recovered through a turbine or waste heat recovery system. Sometimes exhaust temperature is used to heat the aftertreatment system, and it needs to be increased when it is insufficient; other times, the exhaust temperature is too high, and it needs to be reduced to protect the turbine or aftertreatment system. All of this depends on the accurate measurement of exhaust temperature.

[0004] At present, due to the high temperature of the cylinder exhaust outlet of the engine and the small space, it is difficult to directly measure the cylinder exhaust outlet temperature, i.e. the original exhaust temperature of the diesel engine, by placing sensors. How to quickly and accurately determine the original exhaust temperature of the diesel engine is a key research issue in the industry. Summary of the Invention

[0005] This invention provides a method, apparatus, equipment, and medium for determining the exhaust temperature of a diesel engine, so as to quickly and accurately determine the exhaust temperature of a diesel engine.

[0006] According to one aspect of the present invention, a method for determining the exhaust temperature of a diesel engine is provided, comprising:

[0007] When the engine of the target vehicle is determined to be under high load, a diesel engine exhaust temperature model of the target vehicle is established, and the turbine inlet temperature model value of the target vehicle is determined based on the exhaust temperature model.

[0008] Based on the pre-established vortex back temperature model, determine the vortex back temperature model value corresponding to the vortex front temperature model value;

[0009] The vortex-beam temperature sensor value obtained by the vortex-beam sensor is acquired, and the vortex-beam temperature model value and the vortex-beam temperature sensor value are input into a pre-constructed Kalman filter to obtain the final calculated value of the vortex-beam temperature.

[0010] According to another aspect of the present invention, an apparatus for determining the primary exhaust temperature of a diesel engine is provided, comprising:

[0011] The turbine inlet temperature model value determination module is used to establish the original exhaust temperature model of the diesel engine of the target vehicle when the engine of the target vehicle is determined to be under high load, and to determine the turbine inlet temperature model value of the target vehicle based on the original exhaust temperature model.

[0012] The vortex back temperature model value determination module is used to determine the vortex back temperature model value corresponding to the vortex front temperature model value based on the pre-established vortex back temperature model.

[0013] The vortex front temperature final calculation value determination module is used to obtain the vortex back temperature sensor value measured by the vortex back sensor, and input the vortex back temperature model value and the vortex back temperature sensor value into a pre-constructed Kalman filter to obtain the final calculated value of the vortex front temperature.

[0014] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0015] At least one processor; and

[0016] A memory communicatively connected to the at least one processor; wherein,

[0017] The memory stores a computer program that can be executed by the at least one processor, which enables the at least one processor to perform the method for determining the exhaust temperature of a diesel engine according to any embodiment of the present invention.

[0018] According to another aspect of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium storing computer instructions, the computer instructions being configured to cause a processor to execute and implement the method for determining the exhaust temperature of a diesel engine as described in any embodiment of the present invention.

[0019] The technical solution of this invention involves establishing a diesel engine exhaust temperature model for the target vehicle when its engine is under high load, and determining the turbine inlet temperature model value based on the exhaust temperature model. Then, based on a pre-established turbine outlet temperature model, a turbine outlet temperature model value corresponding to the turbine inlet temperature model value is determined. Finally, the turbine outlet temperature sensor value measured by the turbine outlet sensor is acquired, and the turbine outlet temperature model value and the turbine outlet temperature sensor value are input into a pre-constructed Kalman filter to obtain the final calculated turbine inlet temperature value. This method allows for the rapid and accurate determination of the diesel engine's exhaust temperature.

[0020] It should be understood that the description in this section is not intended to identify key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the embodiments of the present invention. Other features of the embodiments of the present invention will become readily apparent from the following description. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a flowchart of a method for determining the primary exhaust temperature of a diesel engine according to Embodiment 1 of the present invention;

[0023] Figure 2 This is a schematic diagram of a device for determining the primary exhaust temperature of a diesel engine according to Embodiment 2 of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of an electronic device that implements the method for determining the diesel engine exhaust temperature according to an embodiment of the present invention. Detailed Implementation

[0025] To enable those skilled in the art to better understand the embodiments of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0026] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of the embodiments of the present invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the present invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0027] Example 1

[0028] Figure 1This is a flowchart illustrating a method for determining the exhaust temperature of a diesel engine according to Embodiment 1 of the present invention. This embodiment is applicable to situations requiring rapid and accurate determination of the exhaust temperature of a vehicle's diesel engine. The method can be executed by a device for determining the exhaust temperature of the diesel engine, which can be implemented in hardware and / or software. This device can be configured in electronic devices such as computers, servers, or tablet computers. Specifically, refer to... Figure 1 The method specifically includes the following steps:

[0029] Step 110: When it is determined that the engine of the target vehicle is under high load, establish the original exhaust temperature model of the diesel engine of the target vehicle, and determine the turbine inlet temperature model value of the target vehicle based on the original exhaust temperature model.

[0030] The target vehicle can be any vehicle that has been started; this embodiment does not limit it.

[0031] In an optional implementation of this embodiment, a diesel engine exhaust temperature model can be pre-established. Furthermore, the turbine inlet temperature model value of the target vehicle can be determined based on the established exhaust temperature model. It is understood that in this embodiment, the turbine inlet temperature model value is the temperature of the gas discharged from the cylinder without passing through the turbine, as determined by the exhaust temperature model.

[0032] Optionally, in this embodiment, establishing the diesel engine exhaust temperature model of the target vehicle may include: establishing the diesel engine exhaust temperature model of the target vehicle based on the law of conservation of energy; further, the turbine inlet temperature model value of the target vehicle can be determined by the following formula:

[0033] T ex =cv air ×M in +M fuel ×HV-POWER-HT / cv ex ×M ex ;

[0034] POWER = f(M) fuel N e P im );

[0035] HT = g(M fuel N e T w );

[0036] Among them, T ex Cv represents the exhaust temperature of the engine cylinder, i.e., the turbine inlet temperature model value. air For the specific heat of air, M in M is the intake airflow rate.fuel HV is the fuel flow rate; CV is the lower heating value of diesel fuel; ex For exhaust specific heat; M ex N represents exhaust flow rate; e p represents engine speed; im T is the intake manifold pressure. w This refers to the water temperature.

[0037] In an optional implementation of this embodiment, when the engine is under medium to high load, according to the law of conservation of energy, intake heat + fuel calorific value = work done + heat transfer + exhaust heat, the exhaust temperature can be determined as:

[0038] T ex =cv air ×M in +M fuel ×HV-POWER-HT / cv ex ×M ex ;

[0039] POWER = f(M) fuel N e p im );

[0040] HT = g(M fuel N e T w );

[0041] Among them, cv air For the specific heat of air, M in Intake airflow rate, unit: kg / h; M fuel Fuel flow rate, unit: kg / h; HV: lower calorific value of diesel fuel; cv ex For exhaust specific heat; M ex Exhaust flow rate, unit: kg / h; N e p represents engine speed; im T is the intake manifold pressure. w This refers to the water temperature.

[0042] In this embodiment, for engines with multiple injections, when calculating POWER, the fuel injection quantity of the near-rear injection needs to be multiplied by the efficiency to be equivalent to the main injection fuel injection quantity to achieve the same torque. Furthermore, when the engine is under low load or idling, the base exhaust temperature is calculated based on the fuel flow rate and air flow rate. For diesel engines with multiple injections, the fuel injection quantity of the near-rear injection needs to be fitted with a polynomial based on the main injection flow rate, the near-rear injection flow rate, and the air flow rate: M main M post M air These are the main injection flow rate, the near and rear injection flow rates, and the air flow rate:

[0043] T ex=h(M main M post M air );

[0044] In this embodiment, when the engine is in reverse towing mode:

[0045] T ex =I(Ne).

[0046] Step 120: Determine the vortex back temperature model value corresponding to the vortex front temperature model value based on the pre-established vortex back temperature model.

[0047] Among them, the after-vortex temperature model can be used to determine the temperature of the gas discharged from the cylinder and discharged after passing through the turbine, that is, the after-vortex temperature model value.

[0048] In this embodiment, the back-vortex temperature model can be determined according to the following formula:

[0049]

[0050] Among them, T a PR is the intake air temperature, PR is the turbocharger pressure ratio, and P is the turbocharger pressure ratio. a For intake pressure, T ref For reference temperature, p ref For reference pressure.

[0051] Optionally, in this embodiment, determining the vortex-after temperature model value corresponding to the vortex-before temperature model value may include: determining the vortex-after temperature model value using the following formula:

[0052]

[0053] in, For the heat transfer loss of the turbine; T ex The exhaust temperature of the engine cylinder, i.e., the turbine inlet temperature model value; cv ex For exhaust specific heat; M ex This refers to the exhaust flow rate.

[0054] In an optional implementation of this embodiment, based on the turbine energy conservation principle, the energy consumed by the compressor is equal to the energy generated by the turbine. The compressor's energy can be calculated using its flow rate and pressure ratio.

[0055] Among them, T a PR is the intake air temperature, PR is the turbocharger pressure ratio, and P is the turbocharger pressure ratio. a For intake pressure, T ref For reference temperature, p ref For reference pressure; furthermore, the turbine outlet temperature can be calculated as follows: The heat transfer loss of the turbine was calculated, namely:

[0056]

[0057] Step 130: Obtain the vortex back temperature sensor value measured by the vortex back sensor, and input the vortex back temperature model value and the vortex back temperature sensor value into a pre-constructed Kalman filter to obtain the final calculated value of the vortex front temperature.

[0058] In this embodiment, one or more temperature sensors can be installed at the rear end of the turbine. The temperature of the turbine exhaust gas can be measured in real time through the temperature sensors, which is the turbine exhaust temperature sensor value involved in this embodiment.

[0059] In an optional implementation of this embodiment, after the vortex-after temperature model value is determined by the vortex-after temperature model and the vortex-after temperature sensor value is measured by the temperature sensor, the vortex-after temperature model value and the vortex-after temperature sensor value can be input into a pre-established Kalman filter to obtain the final calculated value of the vortex-before temperature, which is the original exhaust temperature of the diesel engine. It can be understood that in this embodiment, the original exhaust temperature of the diesel engine is the temperature of the gas discharged from the cylinder.

[0060] Optionally, in this embodiment, the Kalman filter is constructed by the following steps:

[0061] Construct an equation relating the vortex back temperature sensor values ​​and the vortex back temperature model values;

[0062] x(k+1)=Ax(k)+Bν(k)

[0063] y(k)=Cx(k)+η(k);

[0064]

[0065]

[0066] Where A is the state transition matrix, B is the process noise coefficient, C is the observation matrix, η is the measurement noise, a is the calibrable quantity, and K is the calibrable quantity. This represents the final vortex-after temperature after filtering.

[0067]

[0068] C F = [1 0 0](A-AKC);

[0069] D F =[1 0 0]AK;

[0070]

[0071] Optionally, in one implementation of this embodiment, inputting the post-vortex temperature model value and the post-vortex temperature sensor value into a pre-constructed Kalman filter to obtain the final calculated value of the vortex inlet temperature may include: solving the following equation iteratively using Newton's method to obtain the final calculated value of the vortex inlet temperature: Among them, T ex_v This is the virtual sensor value for the temperature at the vortex inlet. This is the virtual sensor value for temperature after the vortex; T DocIn The temperature is measured by a vortex-induced temperature sensor.

[0072] In an optional implementation of this embodiment, after obtaining the final calculated value of the turbine inlet temperature, the method further includes: when the final calculated value of the turbine inlet temperature is greater than a set threshold, reducing the load on the engine to reduce the original exhaust temperature of the engine.

[0073] Optionally, in this embodiment, if the final calculated value of the turbine inlet temperature is greater than a set threshold (e.g., 150 degrees Celsius or 200 degrees Celsius, which is not limited in this embodiment), the engine load can be reduced, thereby reducing the engine's exhaust temperature. This can protect the turbine and aftertreatment system from damage due to high temperature.

[0074] In another optional implementation of this embodiment, if the final calculated value of the turbine inlet temperature is less than or equal to a set threshold, the gas discharged from the cylinder can be directly input to the turbine and the after-treatment system.

[0075] The technical solution of this embodiment establishes a diesel engine exhaust temperature model for the target vehicle when the engine is under high load, and determines the turbine inlet temperature model value based on the exhaust temperature model. It then determines the turbine outlet temperature model value corresponding to the turbine inlet temperature model value based on a pre-established turbine outlet temperature model. Finally, it acquires the turbine outlet temperature sensor value measured by the turbine outlet sensor, and inputs the turbine outlet temperature model value and the turbine outlet temperature sensor value into a pre-constructed Kalman filter to obtain the final calculated turbine inlet temperature value. This allows for the rapid and accurate determination of the diesel engine's exhaust temperature.

[0076] Example 2

[0077] Figure 2 This is a schematic diagram of a device for determining the exhaust temperature of a diesel engine according to Embodiment 3 of the present invention. Figure 2 As shown, the device includes: a vortex inlet temperature model value determination module 210, a vortex outlet temperature model value determination module 220, and a vortex inlet temperature final calculated value determination module 230.

[0078] The turbine inlet temperature model value determination module 210 is used to establish the original exhaust temperature model of the diesel engine of the target vehicle when the engine of the target vehicle is determined to be under high load, and to determine the turbine inlet temperature model value of the target vehicle based on the original exhaust temperature model.

[0079] The vortex back temperature model value determination module 220 is used to determine the vortex back temperature model value corresponding to the vortex front temperature model value based on the pre-established vortex back temperature model.

[0080] The vortex front temperature final calculation value determination module 230 is used to obtain the vortex back temperature sensor value measured by the vortex back sensor, and input the vortex back temperature model value and the vortex back temperature sensor value into a pre-constructed Kalman filter to obtain the final calculated value of the vortex front temperature.

[0081] In this embodiment, the turbine inlet temperature model determination module establishes a diesel engine exhaust temperature model for the target vehicle when the engine is under high load, and determines the turbine inlet temperature model value based on the exhaust temperature model. The turbine outlet temperature model determination module determines the turbine outlet temperature model value corresponding to the turbine inlet temperature model value based on the pre-established turbine outlet temperature model. The turbine inlet temperature final calculation value determination module obtains the turbine outlet temperature sensor value measured by the turbine outlet sensor, and inputs the turbine outlet temperature model value and the turbine outlet temperature sensor value into a pre-constructed Kalman filter to obtain the final turbine inlet temperature value. This allows for the rapid and accurate determination of the diesel engine's exhaust temperature.

[0082] In an optional implementation of this embodiment, the turbine inlet temperature model value determination module 210 is further configured to establish the diesel engine exhaust temperature model of the target vehicle based on the law of conservation of energy.

[0083] The turbine inlet temperature model value of the target vehicle is determined by the following formula:

[0084] T ex =cv air ×M in +M fuel ×HV-POWER-HT / cv ex ×M ex ;

[0085] POWER = f(M) fuel N e p im );

[0086] HT = g(M fuel N e T w );

[0087] Among them, Tex The exhaust temperature of the engine cylinder, i.e., the turbine inlet temperature model value; cv air For the specific heat of air, M in M is the intake airflow rate. fuel HV is the fuel flow rate; CV is the lower heating value of diesel fuel; ex For exhaust specific heat; M ex N represents exhaust flow rate; e p represents engine speed; im T is the intake manifold pressure. w This refers to the water temperature.

[0088] In an optional implementation of this embodiment, the post-vortex temperature model is determined according to the following formula:

[0089]

[0090] Among them, T a PR is the intake air temperature, PR is the turbocharger pressure ratio, and P is the turbocharger pressure ratio. a For intake pressure, T ref For reference temperature, p ref For reference pressure.

[0091] In an optional implementation of this embodiment, the vortex back temperature model value determination module 220 is further configured to determine the vortex back temperature model value using the following formula:

[0092]

[0093] in, For the heat transfer loss of the turbine; T ex The exhaust temperature of the engine cylinder, i.e., the turbine inlet temperature model value; cv ex For exhaust specific heat; M ex This refers to the exhaust flow rate.

[0094] In an optional implementation of this embodiment, the Kalman filter is constructed by the following steps:

[0095] Construct an equation relating the vortex back temperature sensor values ​​and the vortex back temperature model values;

[0096] x(k+1)=Ax(k)+Bv(k)

[0097] y(k)=Cx(k)+η(k);

[0098]

[0099]

[0100] Where A is the state transition matrix, B is the process noise coefficient, C is the observation matrix, η is the measurement noise, a is the calibrable quantity, and K is the calibrable quantity. This represents the final vortex-after temperature after filtering.

[0101]

[0102] C F =[1 0 0](A-AKC)

[0103] D F =[1 0 0]AK

[0104]

[0105] In an optional implementation of this embodiment, the final calculated value determination module 230 for the vortex inlet temperature is specifically used to solve the following equation using Newton's method iteratively to obtain the final calculated value of the vortex inlet temperature:

[0106]

[0107] Among them, T ex_v This is the virtual sensor value for the temperature at the vortex inlet. This is the virtual sensor value for temperature after the vortex; T DocIn The temperature is measured by a vortex-induced temperature sensor.

[0108] In an optional implementation of this embodiment, the device for determining the original exhaust temperature of the diesel engine further includes a load reduction module, used to reduce the load of the engine when the final calculated value of the turbine inlet temperature is greater than a set threshold, so as to reduce the original exhaust temperature of the engine.

[0109] The diesel engine exhaust temperature determination device provided in this embodiment of the invention can execute the diesel engine exhaust temperature determination method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the method.

[0110] Example 3

[0111] Figure 3A schematic diagram of an electronic device 10, which can be used to implement embodiments of the present invention, is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processors, cellular phones, 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 merely illustrative and are not intended to limit the implementation of the embodiments of the invention described and / or claimed herein.

[0112] like Figure 3 As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer program stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 may also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0113] Multiple components in electronic device 10 are connected to I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of displays, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0114] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with 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 special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as the method for determining the exhaust temperature of a diesel engine.

[0115] In some embodiments, the method for determining the diesel engine exhaust temperature can be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on electronic device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the method for determining the diesel engine exhaust temperature described above can be performed. Alternatively, in other embodiments, processor 11 can be configured to perform the method for determining the diesel engine exhaust temperature by any other suitable means (e.g., by means of firmware).

[0116] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0117] Computer programs for implementing the methods of embodiments 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, a special-purpose computer, or other programmable data processing apparatus, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0118] In the context of embodiments of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0119] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0120] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0121] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0122] It should be understood that the various forms of processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the embodiments of the present invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of the embodiments of the present invention can be achieved, and this document does not impose any restrictions.

[0123] The specific embodiments described above do not constitute a limitation on the scope of protection of the embodiments of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the embodiments of the present invention should be included within the scope of protection of the embodiments of the present invention.

Claims

1. A method for determining the primary exhaust temperature of a diesel engine, characterized in that, include: When the engine of the target vehicle is determined to be under high load, a diesel engine exhaust temperature model of the target vehicle is established, and the turbine inlet temperature model value of the target vehicle is determined based on the exhaust temperature model. Based on the pre-established vortex back temperature model, determine the vortex back temperature model value corresponding to the vortex front temperature model value; The vortex back temperature sensor value obtained by the vortex back sensor is acquired, and the vortex back temperature model value and the vortex back temperature sensor value are input into a pre-constructed Kalman filter to obtain the final calculated value of the vortex front temperature. The establishment of the diesel engine exhaust temperature model for the target vehicle includes: A diesel engine exhaust temperature model for the target vehicle is established based on the law of conservation of energy. The turbine inlet temperature model value of the target vehicle is determined by the following formula: T ex =cv air ×M in +M fuel ×HV-POWER-HT / cv ex ×M ex POWER=f(M fuel ,N e ,p im ) HT=g(M fuel ,N e ,T w ) Among them, T ex The exhaust temperature of the engine cylinder, i.e., the turbine inlet temperature model value; cv air For the specific heat of air, M in M is the intake airflow rate. fuel HV is the fuel flow rate; CV is the lower heating value of diesel fuel; CV is the fuel flow rate. ex For exhaust specific heat; M ex N represents exhaust flow rate. e p represents engine speed; im T is the intake manifold pressure. w Water temperature; The post-vortex temperature model is determined according to the following formula: Among them, T a PR is the intake air temperature, PR is the turbocharger pressure ratio, and P is the turbocharger pressure ratio. a For intake pressure, T ref For reference temperature, p ref For reference pressure; Determining the post-vortex temperature model value corresponding to the vortex front temperature model value includes: The value of the post-vortex temperature model is determined using the following formula: in, For the heat transfer loss of the turbine; T ex The exhaust temperature of the engine cylinder, i.e., the turbine inlet temperature model value; cv ex For exhaust specific heat; M ex This refers to the exhaust flow rate.

2. The method according to claim 1, characterized in that, The Kalman filter is constructed by the following steps: Construct an equation relating the vortex back temperature sensor values ​​and the vortex back temperature model values; x(k+1)=Ax(k)+Bν(k) y(k)=Cx(k)+η(k) Where A is the state transition matrix, B is the process noise coefficient, C is the observation matrix, η is the measurement noise, a is the calibrable quantity, and K is the calibrable quantity. This represents the final vortex-after temperature after filtering. C F =[1 0 0](A-AKC) D F =[1 0 0]AK 3. The method according to claim 2, characterized in that, The step of inputting the post-vortex temperature model value and the post-vortex temperature sensor value into a pre-constructed Kalman filter to obtain the final calculated value of the vortex front temperature includes: The final calculated value of the vortex inlet temperature is obtained by solving the following equation using Newton's method iterative approach: Among them, T ex_v This is the virtual sensor value for the temperature at the vortex inlet. This is the virtual sensor value for the temperature after the vortex; T DocIn The temperature is measured by a vortex-induced temperature sensor.

4. The method according to claim 1, characterized in that, After obtaining the final calculated value of the vortex inlet temperature, the following is also included: When the final calculated value of the turbine inlet temperature is greater than the set threshold, the load on the engine is reduced to lower the exhaust temperature of the engine.

5. A device for determining the exhaust temperature of a diesel engine, characterized in that, include: The turbine inlet temperature model value determination module is used to establish the original exhaust temperature model of the diesel engine of the target vehicle when the engine of the target vehicle is determined to be under high load, and to determine the turbine inlet temperature model value of the target vehicle based on the original exhaust temperature model. The vortex back temperature model value determination module is used to determine the vortex back temperature model value corresponding to the vortex front temperature model value based on the pre-established vortex back temperature model. The vortex front temperature final calculation value determination module is used to obtain the vortex back temperature sensor value measured by the vortex back sensor, and input the vortex back temperature model value and the vortex back temperature sensor value into a pre-constructed Kalman filter to obtain the final calculated value of the vortex front temperature. The vortex inlet temperature model value determination module is also used to establish the diesel engine exhaust temperature model of the target vehicle based on the law of conservation of energy. The turbine inlet temperature model value of the target vehicle is determined by the following formula: T ex =cv air ×M in +M fuel ×HV-POWER-HT / cv ex ×M ex POWER=f(M fuel ,N e ,p im ) HT=g(M fuel ,N e ,T w ) Among them, T ex The exhaust temperature of the engine cylinder, i.e., the turbine inlet temperature model value; cv air For the specific heat of air, M in M is the intake airflow rate. fuel HV is the fuel flow rate; CV is the lower heating value of diesel fuel; CV is the fuel flow rate. ex For exhaust specific heat; M ex N represents exhaust flow rate. e p represents engine speed; im T is the intake manifold pressure. w Water temperature; The post-vortex temperature model is determined according to the following formula: Among them, T a PR is the intake air temperature, PR is the turbocharger pressure ratio, and P is the turbocharger pressure ratio. a For intake pressure, T ref For reference temperature, p ref For reference pressure; The vortex back temperature model value determination module is also used to determine the vortex back temperature model value using the following formula: in, For the heat transfer loss of the turbine; T ex The exhaust temperature of the engine cylinder, i.e., the turbine inlet temperature model value; cv ex For exhaust specific heat; M ex This refers to the exhaust flow rate.

6. An electronic device, characterized in that, The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the method for determining the exhaust temperature of the diesel engine according to any one of claims 1-4.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the method for determining the exhaust temperature of the diesel engine as described in any one of claims 1-4.

Images